Academic literature on the topic 'Alternative waste technologies'
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Journal articles on the topic "Alternative waste technologies"
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Kolar, James L. "Alternative energy technologies." Environmental Quality Management 10, no. 2 (2000): 45–54. http://dx.doi.org/10.1002/1520-6483(200024)10:2<45::aid-tqem6>3.0.co;2-p.
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Valenti, Michael. "Rx For Medical Waste." Mechanical Engineering 122, no. 09 (September 1, 2000): 52–56. http://dx.doi.org/10.1115/1.2000-sep-1.
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This article reviews many hospitals and medical centers have found it more economical to replace their on-site incinerators with alternative waste treatment technologies, primarily microwave systems or steam autoclaves, or send waste to treatment companies that are equipped with disinfection technologies. Sanitec International Holdings of West Caldwell, NJ, illustrates the in roads that alternatives are making to medical waste incineration. The entire Sanitec disinfection system is enclosed in all-weather steel housing, and is connected to the hospital’s electrical and water systems. Hospital workers bring collected waste in carts to the automated lift and load system, which raises the cart and empties it into the infeed hopper. The MediWaste system at Laredo is designed to treat up to 200 pounds of material per hour, which is more than sufficient to treat the 700 to 800 pounds of waste generated per day. Although incineration alternatives appear to be gaining popularity, combustion is still used to disinfect and reduce much clinical waste.
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Salkin, I. F. "Conventional and alternative technologies for the treatment of infectious waste." Journal of Material Cycles and Waste Management 5, no. 1 (March 1, 2003): 9–12. http://dx.doi.org/10.1007/s101630300002.
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Amândio, Mariana S. T., Joana M. Pereira, Jorge M. S. Rocha, Luísa S. Serafim, and Ana M. R. B. Xavier. "Getting Value from Pulp and Paper Industry Wastes: On the Way to Sustainability and Circular Economy." Energies 15, no. 11 (June 2, 2022): 4105. http://dx.doi.org/10.3390/en15114105.
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The pulp and paper industry is recognized as a well-established sector, which throughout its process, generates a vast amount of waste streams with the capacity to be valorized. Typically, these residues are burned for energy purposes, but their use as substrates for biological processes could be a more efficient and sustainable alternative. With this aim, it is essential to identify and characterize each type of waste to determine its biotechnological potential. In this context, this research highlights possible alternatives with lower environmental impact and higher revenues. The bio-based pathway should be a promising alternative for the valorization of pulp and paper industry wastes, in particular for bioproduct production such as bioethanol, polyhydroxyalkanoates (PHA), and biogas. This article focuses on state of the art regarding the identification and characterization of these wastes, their main applied deconstruction technologies and the valorization pathways reported for the production of the abovementioned bioproducts.
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ROBBAT, ALBERT. "Hazardous Waste Site Investigation and Cleanup: Innovative Technologies, an Alternative Approach." Hazardous Waste and Hazardous Materials 11, no. 2 (January 1994): 249–51. http://dx.doi.org/10.1089/hwm.1994.11.249.
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Rachiero, Giovanni P., Paula Berton, and Julia Shamshina. "Deep Eutectic Solvents: Alternative Solvents for Biomass-Based Waste Valorization." Molecules 27, no. 19 (October 5, 2022): 6606. http://dx.doi.org/10.3390/molecules27196606.
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Innovative technologies can transform what are now considered “waste streams” into feedstocks for a range of products. Indeed, the use of biomass as a source of biopolymers and chemicals currently has a consolidated economic dimension, with well-developed and regulated markets, in which the evaluation of the manufacturing processes relies on specific criteria such as purity and yield, and respects defined regulatory parameters for the process safety. In this context, ionic liquids and deep eutectic solvents have been proposed as environmentally friendly solvents for applications related to biomass waste valorization. This mini-review draws attention to some recent advancements in the use of a series of new-solvent technologies, with an emphasis on deep eutectic solvents (DESs) as key players in the development of new processes for biomass waste valorization. This work aims to highlight the role and importance of DESs in the following three strategic areas: chitin recovery from biomass and isolation of valuable chemicals and biofuels from biomass waste streams.
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Braverman, V. Ya, and V. V. Vlasyuk. "ТECHNOLOGIES OF UTILIZATION OF MUNICIPAL SOLID WASTE AS A SOURCE OF RECEIVING ALTERNATIVE ENERGY RESOURCES ON THE EXSAMPLE OF ODESSA REGION (REVIEW)." Energy Technologies & Resource Saving, no. 1 (March 20, 2017): 54–59. http://dx.doi.org/10.33070/etars.1.2017.06.
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The problems of solid waste utilization are considered. It is shown that modern technologies of processing allow to consider waste as an alternative renewable resource. A comparison of different technologies of thermal treatment of unsorted waste to generate heat and electricity, such as gasification, pyrolysis, burning in industrial boilers on furnace grates, plasma processing of waste are represented. The main characteristics of industrial plants based on these technologies are discussed. Considered schemes for solving the problems of disposal of municipal solid waste generated in the Odessa region for their practical implementation, such as rice husk, cane, rice stalks, grain straw, medical waste, waste car tires. Specific recommendations on the construction in Odessa region industrial capacities for utilization of solid waste are represented. Bibl. 11.
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Gubacheva, L. A., D. Yu Chizhevskaya, I. V. Makarova, and A. A. Andreev. "TECHNOLOGIES OF RATIONAL NATURE MANAGEMENT IN TRANSPORT." Ecology. Economy. Informatics.System analysis and mathematical modeling of ecological and economic systems 1, no. 5 (2020): 123–29. http://dx.doi.org/10.23885/2500-395x-2020-1-5-123-129.
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In modern conditions, the problem of waste pollution of the earth bowels, the atmosphere, natural and artificial water areas is especially acute. Domestic wastes are incinerated or taken to a landfill, as a result, there is an environmental damage – the area of alienated land resources increases and the atmosphere is polluted. The negative impact of municipal solid waste (MSW) on the environment, leading to climate change, an increase in the greenhouse effect and an increase in the number of natural hazards, makes it necessary to search for solutions to reduce harmful emissions into the atmosphere, increase the energy efficiency of processes, in particular, in transport systems, due to fuel efficiency using. The most negative impact on the state of the air environment is exerted by emissions in the exhaust gases of internal combustion engines, including those using natural gas, nitrogen monoxides and dioxides as fuel. Reducing harmful emissions is possible, for example, by improving the technology for producing generator gas as an alternative fuel, which makes it possible to reduce the concentration of nitrogen oxides in any devices for burning up solid, liquid and gaseous fuels in internal combustion engines. The article discusses the issues of waste generation and their impact on the environment, the technologies for rational use of natural resources in transport and methods for improving waste processing technologies are presented. A new horizontal design of a combined automobile gas generator has been developed. It makes it possible to transfer the power supply from liquid motor fuel to generator gas produced from woodworking industry waste, agricultural waste, solid household and polyethylene-containing waste. This will reduce pollution of the world’s oceans by slowly decomposing polyethylene, which are now acquiring the character of a disaster on a planetary scale. An increase in the environmental level of gasoline engines and a decrease of the amount of waste during the operation of road transport will be achieved with the modernization of the waste processing plant to obtain energy carriers for transport. In its turn, it will make it possible to form a natural and technical system to ensure environmental safety and protect the natural environment.
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Zulqarnain, Muhammad Ayoub, Mohd Hizami Mohd Yusoff, Muhammad Hamza Nazir, Imtisal Zahid, Mariam Ameen, Farooq Sher, Dita Floresyona, and Eduardus Budi Nursanto. "A Comprehensive Review on Oil Extraction and Biodiesel Production Technologies." Sustainability 13, no. 2 (January 15, 2021): 788. http://dx.doi.org/10.3390/su13020788.
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Dependence on fossil fuels for meeting the growing energy demand is damaging the world’s environment. There is a dire need to look for alternative fuels that are less potent to greenhouse gas emissions. Biofuels offer several advantages with less harmful effects on the environment. Biodiesel is synthesized from the organic wastes produced extensively like edible, non-edible, microbial, and waste oils. This study reviews the feasibility of the state-of-the-art feedstocks for sustainable biodiesel synthesis such as availability, and capacity to cover a significant proportion of fossil fuels. Biodiesel synthesized from oil crops, vegetable oils, and animal fats are the potential renewable carbon-neutral substitute to petroleum fuels. This study concludes that waste oils with higher oil content including waste cooking oil, waste palm oil, and algal oil are the most favorable feedstocks. The comparison of biodiesel production and parametric analysis is done critically, which is necessary to come up with the most appropriate feedstock for biodiesel synthesis. Since the critical comparison of feedstocks along with oil extraction and biodiesel production technologies has never been done before, this will help to direct future researchers to use more sustainable feedstocks for biodiesel synthesis. This study concluded that the use of third-generation feedstocks (wastes) is the most appropriate way for sustainable biodiesel production. The use of innovative costless oil extraction technologies including supercritical and microwave-assisted transesterification method is recommended for oil extraction.
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Tsai, Tsuey-Lin, Yi-Fu Chiou, and Shih-Chin Tsai. "Overview of the Nuclear Fuel Cycle Strategies and the Spent Nuclear Fuel Management Technologies in Taiwan." Energies 13, no. 11 (June 10, 2020): 2996. http://dx.doi.org/10.3390/en13112996.
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The continued use of nuclear energy has come into question due to the difficulties in managing radioactive waste, and public opposition has increased since the Fukushima nuclear disaster in March 2011. Nonetheless, the novel spent nuclear fuel (SNF) management technologies proposed indicate new pathways toward facilitating the environment and the sustained use of nuclear energy. The reprocessing and recycling of SNF provides an alternative to direct geological disposal. In this article, we examine the current status and strategic alternatives of radioactive waste management in Taiwan.
Dissertations / Theses on the topic "Alternative waste technologies"
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Robinson, Janet E. "Hazardous waste treatment and disposal: alternative technologies and groundwater impacts." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/91066.
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The most important thermal, chemical, physical, and biological methods for treating hazardous wastes and the fate of their land-disposed residues are reviewed and evaluated. Technologies are described as major, minor, and emerging according to their stage of development or application to hazardous waste; major ones include rotary kiln, liquid injection, and cement kiln incineration; neutralization, chemical oxidation-reduction, and ion exchange; filtration, distillation and settling techniques; and activated sludge, aerated lagoon, and landfarming treatment. Emerging technologies include molten salt and fluidized- bed combustion, liquid-ion extraction and other processes, none of which are considered to be outside the realm of current or future economic feasibility. In addition, waste reduction strategies and the land burial of stabilized/solidified wastes are discussed. Residues from these technologies vary widely according to waste type and composition, but a common component in many of them is heavy metals, which, as elements, cannot be further degraded to other products. The results of the available literature suggests that these metals will be retained in clay liners beneath a landfill through the mechanism of cation exchange, with the adsorption of metals favored by their smaller hydrated size, lower heat of hydration, and in some cases, higher valences than the naturally occurring alkali earth metals. Other important factors include ionic activity, the pH and ionic strength of the solution, the presence of complexing agents, and the possible surface heterogeneity of the clay. In soils, metal binding through cation exchange with clay is augmented by adsorption onto iron and manganese oxides and complexing with organic matter such as humic acids. Many field studies with landfarmed metal-bearing wastes show that these mechanisms are usually sufficient to retain metals to within several inches of their zone of application.M.S.
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Mathews, Lopez Francisco. "A Multi-Criteria Decision-Making Model for Evaluation of Waste-to-Energy Technologies from Municipal Solid Waste| Combustion or Gasification for Puerto Rico?" Thesis, The George Washington University, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10845962.
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The island of Puerto Rico, a commonwealth of the United States of America, has a population of 3,725,789 according to the 2010 census, and generates 11,100 tons daily of waste. In the Island, landfilling is the dominant form of waste disposal. Most municipal solid waste landfills (MSWLF) in Puerto Rico are a principal source of land, water, and air pollution. In addition, the scarcity of appropriate land to open new landfill facilities make this type of waste disposal an unsustainable form of waste management for the Island.
This study evaluated the current situation of the MSWLFs in Puerto Rico and the geographic limitations of continuing with this type of waste disposal on the Island. As alternatives to this problem, the principal waste-to-energy (WTE) technologies, combustion and gasification, are evaluated as environmentally responsible forms for disposal of non-recycled waste.
The evaluation methodology used is based on a multi-criteria decision-making model that uses a subjective rank-order weighting method. Evaluation of WTE technologies is performed by comparing dissimilar indicators in five interest areas: technical, economic, environmental, socio-political, and risk. The methodology is composed of two-components: an expert survey and data analysis.
An evaluation of the environmental interest area was performed to assess which of the WTE technologies studied herein, combustion or gasification, is more environmentally responsible. In addition, using the relevant scores in different interest areas, they were evaluated to determine the economic benefits of these WTE technologies as viable waste management alternatives for Puerto Rico.
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Warnken, Matthew. "Optimal Recovery of Resources: a Case Study of Wood Waste in the Greater Sydney Region." Thesis, The University of Sydney, 2004. http://hdl.handle.net/2123/634.
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In present day society there is an artificial dichotomy between wastes and resources that is perhaps best summed up by the Western Sydney Waste Board slogan 'there is no such thing as waste � only resources in the wrong place and at the wrong time'. Waste management was originally driven by managing the health consequences of wrong time/place materials. This has changed and the significant driver is now the sustainable utilisation of resources, that is, trying to optimally recover as resources (right time/place) those materials that present as wastes requiring management. However, it is not acceptable to justify a resource recovery option purely on the basis that it is diverting material away from landfill. Preferences are emerging for recovery activities that maximise the resource value of a material according to techno-economic, environmental and socio-political criteria; collectively known as the criteria of sustainability. The people and organisations articulating these preferences include owners/operators of resource recovery centres, proponents of alternative waste management technologies, waste planners and managers at both a state and local government level and environmental NGOs representing community interests, in addition to the generators of waste at a domestic, commercial and industrial, and construction and demolition level. It is therefore important to be able to answer the question of 'what is the optimal or most sustainable resource recovery option for materials presenting as waste to landfill in the Greater Sydney Region?' The point of departure for this thesis is twofold. Firstly, that optimal resource recovery options (also known as alternative waste management technologies) can be identified by understanding the context and system drivers and constraints within the system of waste generation and utilisation, by modelling the system using industrial ecology (specifically Materials Flux Analysis) and by using the technology assessment framework developed by the NSW Alternative Waste Management Technologies and Practices Inquiry to evaluate the available options. Secondly, that should the assessment framework from the NSW Inquiry prove to be unsuitable as a framework for evaluation, then an improved and refined assessment framework can be constructed in order to identify optimal resource recovery options and that this process can be successfully demonstrated using wood waste as a case study. The context of waste as an issue has shifted from local government control (pre-1970s) to state government control through the Department of Environment and Conservation. This transition followed experiments with organisations such as the NSW Waste Boards and Resource NSW, in addition to state targets such as a 60% reduction of waste to landfill by the year 2000. In addition to this backdrop of change from a government administrative perspective, there are also a suite of often conflicting drivers and constraints influencing the process of resource recovery. For example, sustainable development is a public policy driver for the integration of environmental and societal concerns, but can also constrain new innovation if competing 'status quo' utilisation options are not subject to the same scrutiny. Similarly, legislation acts as a constraint to resource recovery options by establishing license conditions, prohibiting some energy recovery options and setting recovery criteria; however legislation also acts as a driver for resource recovery options that generate renewable electricity or act to reduce greenhouse gas emissions. Other drivers and constraints include social, technical and economic issues and concerns in addition to environmental impacts such as emissions to air, land and water. Industrial ecology is a model for viewing system components as part of a dependent and interrelated greater whole. Within the context of Industrial Ecology, waste is a by-product of manufacture available as a beneficial input into other processes. Using Materials Flux Analysis as a tool to build a model of waste generation and utilisation, elements within the system are presented as a series of stocks (sources), technology interventions (transformation flows) and sinks (markets). The stocks or sources of materials for resource recovery are categorised as Municipal Solid (MSW), Commercial and Industrial (C&I) or Construction and Demolition (C&D) wastes. Approximately seven million tonnes of waste is generated in the Greater Sydney Region (nearly two and a half million tonnes of materials recovered for recycling and four and a half million tonnes of materials disposed of to landfill). The purpose of technology intervention is to transform the material into a product that is suited to the end market (sink). Markets are grouped according to reuse (same function and form), direct recycling (same supply chain), indirect recycling (different supply chain) and energy recovery (either as process heat, electricity or co-generation, a combination of the two). Landfill is also a potential sink for materials and in this sense can be thought of as a negative value market. The Alternative Waste Management Technologies and Practices Inquiry provided an assessment framework for resource recovery technologies. Each technology was measured and compared against 16 evaluation criteria, resulting in a score out of one hundred. Material sorting scored the highest (81.5), incineration the lowest (50.8) with most of the biological technologies performing �well� (64.6 � 71.7) and with the landfill technologies performing 'moderately well' (60.4 - 61.4). The positive features of the Inquiry included the overview of alternative resource recovery technologies, waste generation and other issues pertinent to decision making and resource recovery. The negatives of the Inquiry arise from the inadequacies of the assessment framework, which lacked technology options, system boundary definition and requisite evaluation criteria in addition to inconsistencies in scoring approaches. By undertaking a sensitivity analysis on the Inquiry�s results, it is shown that rank order reversal results from the allocation of weightings. The improved and refined assessment framework, constructed to overcome identified inadequacies of the Inquiry�s approach, focussed on clearly identifying the problem to be addressed and the primary decision maker involved in the process; ensuring that appropriate options for evaluation were included; defining the system boundary for the assessment; selecting necessary evaluation criteria; adopting a more sophisticated system for scoring; and using a sensitivity analysis to validate the results of the resource recovery option evaluation. Wood waste was used as a case study for this second assessment methodology. Wood waste refers to the end-of-life products, failed products, offcuts, shavings and sawdust from all timber products. Approximately 350,000 tonnes of wood waste are disposed of to landfill each year. This comprises untreated timber (hard wood and soft wood), engineered timber products (particleboard, medium density fibreboard and plywood) and treated timber (predominately copper chrome arsenic). Eight wood resource recovery options are selected for evaluation within the Greater Sydney Region with a different approach to scoring that has the advantage of 'scaling up' the best performers within each attribute (highest score) while 'scaling down' the worst performers (no score). Under this evaluation, an on-site purpose built energy facility is the most preferred option with particleboard manufacture the least preferred option. A sensitivity analysis of the results reveals that the scores of each technology option are sensitive to the weightings of the decision maker. When the change in rankings is examined, it is identified that two eight wood recovery options undergo a large rank reversal. A critique of the results of the wood evaluation reveals five major flaws. Firstly the evaluation produces non-highest resource value results that are non-intuitive (and arguably misleading), for example the poor performance of reuse and particleboard against energy generation options. Secondly, the recording of a single summary score for each recovery option hides unacceptable performance levels in some criteria. For example, the top scorer of Primary Energy On-site hides the fact that such an option is likely to have no political desirability (likely public opposition to 'incineration' within the Sydney air-shed), calling into question its ability to be implemented as a solution. Thirdly there is a reliance on judgement for the scoring of options and weighting of preferences, calling into doubt the accuracy of scores. Fourthly, the rankings of recovery options by the assessment framework are sensitive to the allocation of weightings. Finally and most importantly, the refined evaluation approach suffers from the 'discrete option syndrome', the scoring of each recovery option in isolation with no ability to look at integrated systems with joint recovery options. This is pinpointed as a fundamental flaw in the process of both the Inquiry and the wood evaluation. This leads to the conclusion that the founding assertions of this thesis were false. That is to say that the assessment framework developed by the NSW Alternative Waste Management Technologies and Practices Inquiry is not suitable for use in evaluating resource recovery options. Furthermore a refined assessment framework based on this approach is also unable to identify optimal resource recovery options as demonstrated using wood waste as a case study. The results of this research points to the overall conclusion that any discrete option evaluation and assessment for resource recovery technologies that results in a single summary score for each option will be fundamentally flawed, providing no value in determining optimal resource recovery solutions for the Greater Sydney Region. A systems approach is suggested as an alternative method for the evaluation of optimal resource recovery, the starting point of which is to ask 'what is the highest resource value of the components in the material stream under consideration and how could a network of infrastructure be designed in order to allow materials to flow to their highest resource value use?' A feature of such an integrated approach is a focus on the materials composition of recovered resources, as opposed to recovery technologies, resulting in a 'fit for purpose' as opposed to a 'forced fit' style of resource recovery. It is recommended that further research and public policy efforts be made in logistics planning across the Greater Sydney Region (as opposed to a regional or local government area) in order to create network opportunities for integrated flows of materials to move toward their highest resource value.
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Warnken, Matthew. "Optimal Recovery of Resources: a Case Study of Wood Waste in the Greater Sydney Region." University of Sydney. Chemical Engineering, 2004. http://hdl.handle.net/2123/634.
Full textAbstract:
In present day society there is an artificial dichotomy between wastes and resources that is perhaps best summed up by the Western Sydney Waste Board slogan 'there is no such thing as waste � only resources in the wrong place and at the wrong time'. Waste management was originally driven by managing the health consequences of wrong time/place materials. This has changed and the significant driver is now the sustainable utilisation of resources, that is, trying to optimally recover as resources (right time/place) those materials that present as wastes requiring management. However, it is not acceptable to justify a resource recovery option purely on the basis that it is diverting material away from landfill. Preferences are emerging for recovery activities that maximise the resource value of a material according to techno-economic, environmental and socio-political criteria; collectively known as the criteria of sustainability. The people and organisations articulating these preferences include owners/operators of resource recovery centres, proponents of alternative waste management technologies, waste planners and managers at both a state and local government level and environmental NGOs representing community interests, in addition to the generators of waste at a domestic, commercial and industrial, and construction and demolition level. It is therefore important to be able to answer the question of 'what is the optimal or most sustainable resource recovery option for materials presenting as waste to landfill in the Greater Sydney Region?' The point of departure for this thesis is twofold. Firstly, that optimal resource recovery options (also known as alternative waste management technologies) can be identified by understanding the context and system drivers and constraints within the system of waste generation and utilisation, by modelling the system using industrial ecology (specifically Materials Flux Analysis) and by using the technology assessment framework developed by the NSW Alternative Waste Management Technologies and Practices Inquiry to evaluate the available options. Secondly, that should the assessment framework from the NSW Inquiry prove to be unsuitable as a framework for evaluation, then an improved and refined assessment framework can be constructed in order to identify optimal resource recovery options and that this process can be successfully demonstrated using wood waste as a case study. The context of waste as an issue has shifted from local government control (pre-1970s) to state government control through the Department of Environment and Conservation. This transition followed experiments with organisations such as the NSW Waste Boards and Resource NSW, in addition to state targets such as a 60% reduction of waste to landfill by the year 2000. In addition to this backdrop of change from a government administrative perspective, there are also a suite of often conflicting drivers and constraints influencing the process of resource recovery. For example, sustainable development is a public policy driver for the integration of environmental and societal concerns, but can also constrain new innovation if competing 'status quo' utilisation options are not subject to the same scrutiny. Similarly, legislation acts as a constraint to resource recovery options by establishing license conditions, prohibiting some energy recovery options and setting recovery criteria; however legislation also acts as a driver for resource recovery options that generate renewable electricity or act to reduce greenhouse gas emissions. Other drivers and constraints include social, technical and economic issues and concerns in addition to environmental impacts such as emissions to air, land and water. Industrial ecology is a model for viewing system components as part of a dependent and interrelated greater whole. Within the context of Industrial Ecology, waste is a by-product of manufacture available as a beneficial input into other processes. Using Materials Flux Analysis as a tool to build a model of waste generation and utilisation, elements within the system are presented as a series of stocks (sources), technology interventions (transformation flows) and sinks (markets). The stocks or sources of materials for resource recovery are categorised as Municipal Solid (MSW), Commercial and Industrial (C&I) or Construction and Demolition (C&D) wastes. Approximately seven million tonnes of waste is generated in the Greater Sydney Region (nearly two and a half million tonnes of materials recovered for recycling and four and a half million tonnes of materials disposed of to landfill). The purpose of technology intervention is to transform the material into a product that is suited to the end market (sink). Markets are grouped according to reuse (same function and form), direct recycling (same supply chain), indirect recycling (different supply chain) and energy recovery (either as process heat, electricity or co-generation, a combination of the two). Landfill is also a potential sink for materials and in this sense can be thought of as a negative value market. The Alternative Waste Management Technologies and Practices Inquiry provided an assessment framework for resource recovery technologies. Each technology was measured and compared against 16 evaluation criteria, resulting in a score out of one hundred. Material sorting scored the highest (81.5), incineration the lowest (50.8) with most of the biological technologies performing �well� (64.6 � 71.7) and with the landfill technologies performing 'moderately well' (60.4 - 61.4). The positive features of the Inquiry included the overview of alternative resource recovery technologies, waste generation and other issues pertinent to decision making and resource recovery. The negatives of the Inquiry arise from the inadequacies of the assessment framework, which lacked technology options, system boundary definition and requisite evaluation criteria in addition to inconsistencies in scoring approaches. By undertaking a sensitivity analysis on the Inquiry�s results, it is shown that rank order reversal results from the allocation of weightings. The improved and refined assessment framework, constructed to overcome identified inadequacies of the Inquiry�s approach, focussed on clearly identifying the problem to be addressed and the primary decision maker involved in the process; ensuring that appropriate options for evaluation were included; defining the system boundary for the assessment; selecting necessary evaluation criteria; adopting a more sophisticated system for scoring; and using a sensitivity analysis to validate the results of the resource recovery option evaluation. Wood waste was used as a case study for this second assessment methodology. Wood waste refers to the end-of-life products, failed products, offcuts, shavings and sawdust from all timber products. Approximately 350,000 tonnes of wood waste are disposed of to landfill each year. This comprises untreated timber (hard wood and soft wood), engineered timber products (particleboard, medium density fibreboard and plywood) and treated timber (predominately copper chrome arsenic). Eight wood resource recovery options are selected for evaluation within the Greater Sydney Region with a different approach to scoring that has the advantage of 'scaling up' the best performers within each attribute (highest score) while 'scaling down' the worst performers (no score). Under this evaluation, an on-site purpose built energy facility is the most preferred option with particleboard manufacture the least preferred option. A sensitivity analysis of the results reveals that the scores of each technology option are sensitive to the weightings of the decision maker. When the change in rankings is examined, it is identified that two eight wood recovery options undergo a large rank reversal. A critique of the results of the wood evaluation reveals five major flaws. Firstly the evaluation produces non-highest resource value results that are non-intuitive (and arguably misleading), for example the poor performance of reuse and particleboard against energy generation options. Secondly, the recording of a single summary score for each recovery option hides unacceptable performance levels in some criteria. For example, the top scorer of Primary Energy On-site hides the fact that such an option is likely to have no political desirability (likely public opposition to 'incineration' within the Sydney air-shed), calling into question its ability to be implemented as a solution. Thirdly there is a reliance on judgement for the scoring of options and weighting of preferences, calling into doubt the accuracy of scores. Fourthly, the rankings of recovery options by the assessment framework are sensitive to the allocation of weightings. Finally and most importantly, the refined evaluation approach suffers from the 'discrete option syndrome', the scoring of each recovery option in isolation with no ability to look at integrated systems with joint recovery options. This is pinpointed as a fundamental flaw in the process of both the Inquiry and the wood evaluation. This leads to the conclusion that the founding assertions of this thesis were false. That is to say that the assessment framework developed by the NSW Alternative Waste Management Technologies and Practices Inquiry is not suitable for use in evaluating resource recovery options. Furthermore a refined assessment framework based on this approach is also unable to identify optimal resource recovery options as demonstrated using wood waste as a case study. The results of this research points to the overall conclusion that any discrete option evaluation and assessment for resource recovery technologies that results in a single summary score for each option will be fundamentally flawed, providing no value in determining optimal resource recovery solutions for the Greater Sydney Region. A systems approach is suggested as an alternative method for the evaluation of optimal resource recovery, the starting point of which is to ask 'what is the highest resource value of the components in the material stream under consideration and how could a network of infrastructure be designed in order to allow materials to flow to their highest resource value use?' A feature of such an integrated approach is a focus on the materials composition of recovered resources, as opposed to recovery technologies, resulting in a 'fit for purpose' as opposed to a 'forced fit' style of resource recovery. It is recommended that further research and public policy efforts be made in logistics planning across the Greater Sydney Region (as opposed to a regional or local government area) in order to create network opportunities for integrated flows of materials to move toward their highest resource value.
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Brewis, Chandre. "Quantifying the environmental dimension of sustainability for the built environment : with a focus on low-cost housing in South Africa." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20298.
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Thesis (MScEng)--Stellenbosch University, 2012.ENGLISH ABSTRACT: Sustainability is difficult to achieve in a world where population and economic growth leads to increased production of greenhouse gases, resource depletion and waste generation. Today, the environmental dimension of sustainability, which is more commonly known as the natural environment, and the construction industry are two terms often mentioned together. In Europe, 12.4 % of greenhouse gas emissions are induced by the construction and manufacturing industry (Maydl, 2004). Also, 50 % of the resources extracted are used in the construction industry and more than 25 % of waste generated is construction and demolition waste. In South Africa, the building sector accounts for approximately 23 % of the total greenhouse gas emissions (Milford, 2009). Furthermore, 60 % of investment is made in the residential sector where 33 % of the building stock is the focus of the government’s Housing Programme. It is seen that the construction industry significantly impacts the natural environment and the aim should be to reduce this negative impact. Within the local residential sector, the low-cost housing sector presents potential when it comes to sustainable improvements. Each of the three spheres of sustainability, namely economy, natural environment and society, plays a crucial role in this sector. Various studies have been done on the economical and social fields, but little information exists on the impact low-cost houses have on the environment. A need arises to scientifically quantify the environmental impact hereof, therefore it is chosen as the focus of this study. Various methods in order to determine the environmental impact of the built environment exist globally, but they tend to be complex, are used in conjunction with difficult to understand databases and require expensive software. A need for a local quantification method with which to determine the environmental impact of the built environment, more specifically low-cost housing, has been identified. A simple and easy-to-use analysis-orientated quantification method is proposed in this study. The quantification method is compiled with indicators related to the local conditions; these include Emissions, Resource Depletion and Waste Generation. The end objective is to provide the user with an aggregated total value called the Environmental Impact Index to ease comparison of possible alternatives. The quantification method is developed as a mathematical tool in the form of a partial Life Cycle Assessment which can aid in objective decision making during the conception and design phase of a specific project. Note that only the Pre-Use Phase of the building life cycle is considered during the assessment, but can be extended to include the Use Phase and End-of-Life Phase. The proposed method has the capability of calculating and optimising the environmental impact of a building. Regarding low-cost housing, different housing unit designs can be compared in order to select the best alternative. The quantification method is implemented for two low-cost house design types in this study. Firstly, the conventional brick and mortar design is considered whereafter a Light Steel Frame Building is viewed as an alternative. The model implementation demonstrates that the model operates in its supposed manner. Also, Light Steel Frame Building housing units are shown to be worth investigating as an alternative to the conventional brick and mortar design but should be confirmed with a more accurate Life Cycle Assessment.
AFRIKAANSE OPSOMMING: In ’n wêreld waar toenemende ekonomiese en bevolkingsgroei veroorsaak dat al hoe meer kweekhuisgasse voortgebring word, hulpbronne uitgeput word en groter hoeveelhede rommel geproduseer word, is dit ’n bykans onbegonne taak om volhoubaarheid te probeer bereik. Volhoubaarheid rakende die natuurlike omgewing en konstruksie is twee terme wat vandag dikwels saam genoem word. Ongeveer 12.4 % van die kweekhuisgasse wat in Europa vrygestel word kom uit die konstruksie- en vervaardigingbedrywe (Maydl, 2004). Die konstruksiebedryf gebruik ook bykans die helfte van hulpbronne wat ontgin word en meer as 25 % van rommel word deur konstruksie of sloping produseer. Die Suid-Afrikaaanse boubedryf is verantwoordelik vir 23 % van die totale hoeveelheid kweekhuisgasse wat die land vrystel. Die behuisingsektor, waar die regering aan die hoof van 33 % van eenhede staan, ontvang 60 % van bestaande beleggings (Milford, 2009). Dit is dus duidelik dat die boubedryf ’n negatiewe impak op die natuurlike omgewing het en dat dit van groot belang is om dié situasie te verbeter. In die behuisingsektor het lae-koste-behuising groot potensiaal as dit kom by volhoubaarheid. Volhoubaarheid bestaan uit drie sfere: ekonomie, natuurlike omgewing en sosiaal, en al drie speel ’n betekenisvolle rol in lae-koste-behuising. Daar is reeds verskeie studies aangepak om die ekonomiese en sosiale sfere te beskryf, maar daar is steeds min inligting beskikbaar oor die omgewingsimpak van ’n lae-koste-huis. Dit laat die behoefte ontstaan om hierdie impak te kwantifiseer. Bestaande metodes wat wêreldwyd gebruik word om ʼn omgewingsimpak te bepaal is dikwels besonder kompleks en benodig duur sagteware tesame met ingewikkelde databasisse om dit te implementeer. ’n Behoefte aan ’n plaaslike kwantifiseringsmetode is geïdentifiseer. Hierdie studie stel ’n eenvoudige, gebruikersvriendelike kwantifiseringsmetode bekend. Dit word saamgestel uit faktore wat verband hou met die plaaslike omgewing: Uitlaatgasse, Hulpbronuitputting en Rommelvervaardiging. Uiteindelik word ’n saamgestelde waarde, wat die Omgewingsimpak-indeks genoem word, bereken om vergelyking te vergemaklik. Hierdie kwantifiseringsmetode word aan die hand van ’n gedeeltelike lewenssiklus-analise as ’n wiskundige hulpmiddel ontwikkel. Slegs die eerste fase van ’n gebou se lewenssiklus word beskou tydens hierdie studie, maar dit is moontlik om die ander twee fases in te sluit. Die voorgestelde metode het die vermoë om die omgewingsimpak te bereken en ook te optimeer. Tydens die ontwerpsfase, wanneer belangrike besluite geneem moet word, kan so ’n hulpmiddel van enorme waarde wees om die beste opsie uit verskillende alternatiewe te help identifiseer. Die studie beskou twee tipes behuisingseenhede vir die doel van implementering van die kwantifiseringsmetode: die konvensionele baksteen en mortel metode en alternatiewelik ’n ligte staalraamwerk-gebou. Tydens implementering van die voorgestelde metode, demonstreer die model dat dit werk soos dit veronderstel is om te funksioneer. Verder is getoon dat ’n ligte staalraamwerk-gebou ’n waardevolle alternatief is om te ondersoek, maar dit moet liefs met ’n meer akkurate lewenssiklus-analise bevestig word.
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(9780230), Sharmina Begum. "Assessment of alternative waste technologies for energy recovery from solid waste in Australia." Thesis, 2016. https://figshare.com/articles/thesis/Assessment_of_alternative_waste_technologies_for_energy_recovery_from_solid_waste_in_Australia/13436876.
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Solid waste can be considered either as a burden or as a valuable resource for energy generation. Therefore, identifying an environmentally sound and technoeconomically feasible solid waste treatment is a global and local challenge. This study focuses on identifying an Alternative Waste Technology (AWT) for meeting this global and local demand. AWT recovers more resources from the waste flow and reduces the impact on the environment. There are three main pathways for converting solid waste into energy: thermo-chemical, biochemical and physicochemical. This study deals with thermochemical conversion processes. Mainly four thermo-chemical conversion processes of AWTs are commonly used in Australia: anaerobic digestion, pyrolysis, gasification and incineration. The main aim of this study is to identify and test the most suitable AWT for use in Australia. A decision-making tool, Multi-Criteria Analysis (MCA), was used to identify the most suitable AWT. MCA of the available AWTs was performed using five criteria, that is, capital cost, complexity, public acceptability, diversion from landfill and energy produced, from which Gasification technology has been identified as the most suitable AWT for energy recovery from solid waste. This study then mainly focused on assessing the performance of gasification technology for converting solid waste into energy both experimentally and numerically. Experimental investigation of solid waste gasification was performed using a pilotscale gasification plant of Corky’s Carbon and Combustion P/L plant in Mayfield, Australia. In this experiment, wood chips were used as feedstock (solid waste) under specified gasifier operating conditions. Syngas composition was measured at different stages of gasification, such as raw, scrubbed and dewatered syngas. Mass and energy balance was analysed using the experimental measured data. It was found that 65 per cent of the original energy of solid waste was converted to syngas, 23 per cent converted to char and 6 per cent converted to hot oil. The remaining 6 per cent was lost to the atmosphere. Firstly, a numerical investigation was performed by developing a computational process model using Advanced System for Process ENgineering (ASPEN) Plus software. Computational models were developed for both fixed bed gasification and fluidised bed gasification processes. A simplified, small scale fixed bed gasification model was initially developed in order to observe the performance of the solid waste gasification process. The model is validated with experimental data of Municipal Solid Waste (MSW) and food waste from the literature. Using this validated model, the effects of gasifier operating conditions, such as gasifier temperature, air-fuel ratio and steam-fuel ratio were examined and performance analyses were conducted for four different feedstocks, namely wood, coffee bean husks, green wastes and MSWs. Secondly, a computational model was developed for the fluidised bed gasification process. The model was validated with experimental data for wood chips (solid waste) measured at Corky’s Carbon and Combustion plant. A very good agreement was found between simulation and experimental results, with a maximum variation of 3 per cent. The validated model was used to analyse the effects of gasifier operating conditions. Using the fluidised bed gasification model, a detailed analysis was done for both energy and exergy in order to achieve a complete picture of the system outcome. Energy efficiency of 78 per cent and exergetic efficiency of 23 per cent were achieved for the system. The developed fixed bed and fluidised bed gasification models were useful to predict the various operating parameters of a solid waste gasification plant, such as temperature, pressure, air-fuel ratio and steam-fuel ratio. This research outcome contributes to a better understanding by stakeholders and policy makers at national and international levels who are responsible for developing different waste management technologies. In future, this research can be extended for other feedstocks, such as green waste, sugarcane bagasse and mixed MSW.
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(7518488), Michael D. Ozeh. "Design And Fabrication Of A Hybrid Nanoparticle-Wick Heat Sink Structure For Thermoelectric Generators In Low-Grade Heat Utilization.pdf." Thesis, 2019.
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Waste heat recovery is a multi-billion-dollar industry with a compound annual growth rate of 8.8% assessed between 2016 to 2024 and low-grade waste heat (< 230oC ± 20oC) makes up 66% of this ubiquitous resource. Thermoelectric generators are preferred for the recovery process because they are cheap and are well suited for this temperature range. They generate power by converting thermal potential to electric potential, known as the Seebeck effect. Since they have no moving parts, they are inherently immune to mechanical failure or an intermittent need for maintenance. However, the challenge has been to effectively harvest waste heat with these modules to generate power, using passive processes. This work is focused on designing a device for optimized harvesting of waste energy from the ambient with a custom, evaporatively-cooled heat sink. This heat sink is designed to passively handle the cooling of the other side of the thermoelectric module so as to enable the attainment of a minimum of 5V, which is the minimum voltage required to power small mobile devices. The heat sink model is similar to a loop heat pipe but engineered for compactness. To ensure this level of efficacy is attained, several studies are made to optimize the wick. Non-metal wicks were considered as they do not contribute to an increase in temperature of the compensation chamber in loop heat pipes. A non-metal wick integrated with nanoparticles is tested and results show a clear thermal management enhancement over similar but virgin non-metal wicks, at over 16%. The heat source section of the device is optimized for energy-harvesting in low grade temperature regimes by incorporating a near-black body coating on the metal heat source section. Experimental results show that both the heat source and sink sections were able to induce sufficient thermal potential for the thermoelectric modules to passively generate up to 5V using eight 40mm by 40mm Bismuth Telluride modules in 3.5 minutes. The prototype is relatively cheap, inherently reliable and presents the possibility of passively harvesting low-grade waste heat for later use, including powering small electronic devices.
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Austin, Lorimer Mark. "Investigation into the South African application of certain alternative technologies for disposal of sanitation system wastes." Diss., 2000. http://hdl.handle.net/2263/23564.
Full textBooks on the topic "Alternative waste technologies"
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Waste management and valorization: Alternative technologies. Toronto: Apple Academic Press, 2015.
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Hazardous Substances Alternative Treatment Technologies Seminar (1985 Springfield, Ill.). Hazardous Substances Alternative Treatment Technologies Seminar: Proceedings. Springfield, Ill. (2200 Churchill Rd., Springfield 62706): Illinois Environmental Protection Agency, 1985.
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Tim, Holden, ed. How to select hazardous waste treatment technologies for soils and sludges: Alternative, innovative, and emerging technologies. Park Ridge, N.J., U.S.A: Noyes Data Corp., 1989.
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Robbins, Janelle Hope. Understanding alternative technologies for animal waste treatment: A citizen's guide to manure treatment teachnologies. Tarrytown, N.Y: Waterkeeper Alliance, 2005.
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Chertow, Marian R. Garbage solutions: A public official's guide to recycling and alternative solid waste management technologies. Washington, D.C: National Resource Recovery Association, United States Conference of Mayors, 1989.
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Materials, California Legislature Assembly Committee on Environmental Safety and Toxic. Interim hearing on alternative technologies and practices for the management of hazardous waste in California: November 13, 1987, Room 437, State Capitol, Sacramento, California. Sacramento, CA: Joint Publications Office, 1987.
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NATO Advanced Research Workshop on Scientific Advances in Alternative Demilitarization Technologies (1995 Warsaw, Poland). Scientific advances in alternative demilitarization technologies. Dordrecht: Kluwer Academic, 1996.
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United States. Congress. House. Committee on Public Works and Transportation. Subcommittee on Investigations and Oversight. Administration of the federal Superfund program: Hearings before the Subcommittee on Investigations and Oversight of the Committee on Public Works and Transportation, House of Representatives, One Hundred Second Congress, second session, May 19, 1992 (liability issues), June 9, 1992 (risk assessment), June 30, 1992 (selection of remedy), July 28, 29, 1992 (federal facilities), September 15, 1992 (innovative and alternative cleanup technologies). Washington: U.S. G.P.O., 1993.
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W, Holm Francis, North Atlantic Treaty Organization. Scientific Affairs Division., and NATO Advanced Research Workshop on Effluents from Alternative Demilitarization Technologies (1997 : Prague, Czech Republic), eds. Effluents from alternative demilitarization technologies. Dordrecht: Kluwer Academic Publishers, 1998.
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United States. Congress. Office of Technology Assessment., ed. Disposal of chemical weapons: Alternative technologies. Washington, D.C: Congress of the U.S., Office of Technology Assessment, 1992.
Find full textBook chapters on the topic "Alternative waste technologies"
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Anderson, Thomas. "Overview of Radioactive and Mixed Waste Cleanup Technologies." In Mobile Alternative Demilitarization Technologies, 221–77. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5526-7_14.
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Vehlow, Jurgen. "Cleaning of Gaseous Products from Thermal Waste Treatment." In Effluents from Alternative Demilitarization Technologies, 47–69. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5310-2_5.
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Yasay, Jeffrey John R. "Development and Assessment of Outdated Computers: A Technology Waste for Alternative Using Parallel Clustering." In Smart Innovation, Systems and Technologies, 685–94. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-3675-2_52.
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Lin, J., B. Hong, T. S. Li, D. W. Wan, Z. P. Fan, and Sabine Leischner. "Recycling of waste Glass Fiber Reinforced Polymer (GFRP) power as alternative filler for asphalt mastics." In Green and Intelligent Technologies for Sustainable and Smart Asphalt Pavements, 525–30. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003251125-83.
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Marmolejo-Rebellón, Luis Fernando, Edgar Ricardo Oviedo-Ocaña, and Patricia Torres-Lozada. "Organic Waste Composting at Versalles: An Alternative That Contributes to the Economic, Social and Environmental Well-Being of Stakeholders." In Organic Waste Composting through Nexus Thinking, 147–64. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-36283-6_7.
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AbstractComposting is one of the most widely used technologies for the recovery and use of organic waste from municipal solid waste (MSW); however, its implementation in some developing countries has mostly been ineffective. This chapter documents the experience of the composting of municipal organic waste in the urban area of the municipality of Versalles, Valle del Cauca, Colombia. Within the locality, composting of organic waste occurs at an MSW management plant (SWMP), after being separated at the source and selectively collected. The information presented was generated through collaborative research projects, conducted with the cooperation of Camino Verde APC (a community-based organisation providing sanitation services) and Universidad del Valle (Cali, Colombia). The evaluations undertaken show that (i) within the locality, high rates of separation, at the source, in conjunction with selective collection and efficient waste sorting and classification processes in the SWMP, have significantly facilitated the composting process; (ii) the incorporation of locally available amendment or bulking materials (e.g. star grass and cane bagasse) improves the physicochemical quality of the processed organic waste and favours development (i.e. a reduction in process time), leading to an improvement in product quality; (iii) the operation, maintenance and monitoring of the composting process can be carried out by previously trained local human talent; and (iv) revenues from the sale of the final product (compost) are not sufficient to cover the operating costs of the composting process. Despite this current lack of financial viability, the application of technology entails environmental benefits (e.g. a reduction in the generation of greenhouse gases) and social benefits (e.g. employment opportunities), which, given the conditions in the municipality studied, highlight the relevance of this technological option.
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Ray, Shiv Kumar, and Om Prakash. "Biodiesel Extracted from Waste Vegetable Oil as an Alternative Fuel for Diesel Engine: Performance Evaluation of Kirlosker 5 kW Engine." In Renewable Energy and its Innovative Technologies, 219–29. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2116-0_18.
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Berkey, Edgar, Stephen W. Paff, and A. Bruce King. "Sulchem Process for Treatment of Chemical Weapons-Related Wastes." In Mobile Alternative Demilitarization Technologies, 129–48. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5526-7_8.
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Herrero, Mario, Marta Hugas, Uma Lele, Aman Wirakartakusumah, and Maximo Torero. "A Shift to Healthy and Sustainable Consumption Patterns." In Science and Innovations for Food Systems Transformation, 59–85. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-15703-5_5.
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AbstractThis chapter recognises that current food consumption patterns, often characterised by higher levels of food waste and a transition in diets towards higher energy, more resource-intensive foods, need to be transformed. Food systems in both developed and developing countries are changing rapidly. Increasingly characterised by a high degree of vertical integration, evolutions in food systems are being driven by new technologies that are changing production processes, distribution systems, marketing strategies, and the food products that people eat. These changes offer the opportunity for system-wide change in the way in which production interacts with the environment, giving greater attention to the ecosystem services offered by the food sector. However, developments in food systems also pose new challenges and controversies. Food system changes have responded to shifts in consumer preferences towards larger shares of more animal-sourced and processed foods in diets, raising concerns regarding the calorific and nutritional content of many food items. By increasing food availability, lowering prices and increasing quality standards, they have also induced greater food waste at the consumer end. In addition, the potential fast transmission of food-borne disease, antimicrobial resistance and food-related health risks throughout the food chain has increased, and the ecological footprint of the global food system continues to grow in terms of energy, resource use, and impact on climate change. The negative consequences of food systems from a nutritional, environmental and livelihood perspective are increasingly being recognised by consumers in some regions. With growing consumer awareness, driven by concerns about the environmental and health impacts of investments and current supply chain technologies and practices, as well as by a desire among new generations of city dwellers to reconnect with their rural heritage and use their own behaviour to drive positive change, opportunities exist to define and establish added-value products that are capable of internalising social or environmental delivery within their price. These forces can be used to fundamentally reshape food systems by stimulating coordinated government action in changing the regulatory environment that, in turn, incentivises improved private sector investment decisions. Achieving healthy diets from sustainable food systems is complex and requires a multi-pronged approach. Actions necessary include awareness-raising, behaviour change interventions in food environments, food education, strengthened urban-rural linkages, improved product design, investments in food system innovations, public-private partnerships, public procurement, and separate collection that enables alternative uses of food waste, all of which can contribute to this transition. Local and national policy-makers and small- and large-scale private sector actors have a key role in both responding to and shaping the market opportunities created by changing consumer demands.
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Krause, Ariane. "Valuing Waste – A Multi-method Analysis of the Use of Household Refuse from Cooking and Sanitation for Soil Fertility Management in Tanzanian Smallholdings." In Organic Waste Composting through Nexus Thinking, 91–122. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-36283-6_5.
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AbstractThe starting point of this work is the intention of two farmers’ initiatives to disseminate locally developed and adapted cooking and sanitation technologies to smallholder households in Karagwe District, in northwest Tanzania. These technologies include improved cooking stoves (ICSs), such as microgasifiers, and a system combining biogas digesters and burners for cooking, as well as urine-diverting dry toilets, and thermal sterilisation/pasteurisation for ecological sanitation (EcoSan). Switching to the new alternatives could lead to a higher availability of domestic residues for soil fertility management. These residues include biogas slurry from anaerobic digestion, powdery biochar from microgasifiers and sanitised human excreta from EcoSan facilities. Such recycling-driven approaches address an existing problem for many smallholders in sub-Saharan Africa, namely, the lack of soil amenders to sufficiently replenish soil nutrients and soil organic matter (SOM) in soils used for agricultural activity. This example from Tanzania systematically examines the nexus of ‘energy-sanitation-agriculture’ in smallholder farming systems. The short-term experiments demonstrated that all soil amenders that were analysed could significantly enhance crop productivity. CaSa-compost – the product of co-composting biochar with sanitised human excreta – quadrupled grain yields. The observed stimulation of crop yield and also plant nutrition is attributed to improved nutrient availability caused by a direct increase of soil pH and of plant-available phosphorus (P) in the soil. The assessment of the lasting soil implications revealed that CaSa-compost and biogas slurry both show the long-term potential to roughly double yields of maize. Corresponding nutrient requirements can be adequately compensated through residue capturing and subsistence production of soil amenders. The potential of CaSa-compost for sustainable soil fertility management is superior to that of standard compost, especially with respect to liming, replenishing soil P and restoring SOM. Biogas slurry, however, yields inferior results in all aspects when compared to compost amendments.
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"Energy Generation from Waste Sources." In Handbook of Alternative Fuel Technologies, 542–67. CRC Press, 2014. http://dx.doi.org/10.1201/b17157-21.
Full textConference papers on the topic "Alternative waste technologies"
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Загороднюк, Л. Х., L. H. Zagorodnyuk, Н. А. Науменко, N. A. Naumenko, И. Н. Туцкая, and I. N. Tuckaya. "ALTERNATIVE CONSTRUCTIONS FOR COLLECTION DOMESTIC WASTE." In International Scientific and Practical 65th anniversary conference BSTU them. V.G. Shukhov "HIGH-TECH TECHNOLOGIES AND INNOVATIONS (XXIII scientific readings)". Belgorod State Technological University named after V.G. Shukhov, 2019. http://dx.doi.org/10.12737/conferencearticle_5cecedc2416900.74337634.
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Moulton-Patterson, Linda. "The Emergence of Conversion Technologies in California as a Viable Alternative to Landfilling." In 12th Annual North American Waste-to-Energy Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/nawtec12-2201.
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In the 1980’s, California faced landfill siting problems and a projected shortage of landfill capacity that could impact the health and safety in California. To address this issue, the California Integrated Waste Management Act was passed in 1990 and established a framework to limit reliance on landfills. This framework gives greater emphasis to recycling, waste prevention, source reduction, and composting. The Integrated Waste Management Act required each city and county to implement plans to divert 25% of solid waste by 1995 and 50% by 2000 from landfills. Although we have achieved a 47% diversion rate and have 170 composting facilities, we still have approximately 30 millions tons of material being landfilled. This may be an untapped resource for energy and alternative fuels production.
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Pavani, Abhishek, Akash Hebale, Veraj Poojary, Shashank Parulekar, Chaudhari Kiran, and Kapse Neeta. "Waste sunflower oil as an alternative fuel for diesel engines." In 2015 International Conference on Nascent Technologies in the Engineering Field (ICNTE). IEEE, 2015. http://dx.doi.org/10.1109/icnte.2015.7029919.
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Safin, R., V. Sotnikov, I. Karimov, R. Miftahov, and I. Il'yasov. "ENERGY-SAVING TECHNOLOGY FOR PROCESSING WOOD WASTE." In Ecological and resource-saving technologies in science and technology. FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov, 2022. http://dx.doi.org/10.34220/erstst2021_192-196.
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Waste recycling is a key direction in the resource conservation policy of most developed countries of the world. In Russia, much attention is paid to waste processing, but to this day, the main method of waste processing is incineration. The efficiency of this method is rather low and also harmful to the environment. Waste can be processed more efficiently, while obtaining useful products for the economy and alternative fuels. The best alternative to waste incineration is their pyrogenetic decomposition. Recycling using this technology decomposes waste into 3 fractions: solid, gaseous and liquid. Gas and distillate (liquid) are alternative fuels, and the carbonaceous residue can serve as the basis for the production of an adsorbent useful in the industry - activated carbon. Energy saving in the presented technology is achieved through the use of high-calorific combustible gases obtained during the decomposition of waste as the main heat carrier.
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Ellyin, Claudine, and Nickolas J. Themelis. "Small Scale Waste-to-Energy Technologies." In 19th Annual North American Waste-to-Energy Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/nawtec19-5447.
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The dominant technology for large Waste-to-Energy (WTE) facilities is combustion on a moving grate of “as-received” municipal solid wastes (MSW). However, there are circumstances where a low-capacity plant (<100,000 tons per year) is required. This study examines the technical, economic, and environmental aspects of some small-scale WTE technologies currently in operation. The Energos technology was developed in Norway, in order to provide relatively small communities with an economically efficient alternative to mass-burn incineration with equally low emissions to the atmosphere and flexibility in feedstock. All operating plants treat MSW plus additional streams of commercial or industrial wastes. Prior to thermal treatment, the materials are shredded in a high-torque, low-rpm shredder and ferrous metals are removed magnetically. The feedstock is partially oxidized on a moving grate in the gasification chamber where the fixed carbon is completely burnt off. The volatilized gases are fully combusted in a second chamber and the heat is transferred to a heat recovery system for steam generation. The Energos gasification technology is currently in operation at six plants in Norway, one in Germany, and one in the UK. As expected, the capital cost per ton of annual ton of capacity increases with decreasing plant capacity, while there is a linear relationship between energy recovery and capacity. Some other small-scale technologies are investigated in this study and will be reported at the NAWTEC meeting. Low capacity (<80,000 tons) WTE facilities require a relatively small footprint (1.5 to 2 acres; <1 hectare) and it is believed that these facilities can be built at a capital cost per ton that is as low, or lower, than that of large mass burn WTE facilities.
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Ghilardi, Alessandra, Guido Francesco Frate, Andrea Baccioli, Dario Ulivieri, Lorenzo Ferrari, Umberto Desideri, Lorenzo Cosi, Simone Amidei, and Vittorio Michelassi. "Techno-Economic Comparison of Several Technologies for the Waste Heat Recovery From Gas Turbine Exhausts." In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-83199.
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Abstract The waste heat recovery from the gas turbine (GT) exhaust is typical for increasing performance and reducing CO2 emissions in industrial facilities. Nowadays, numerous already operating GT gas turbine plants could be retrofitted and upgraded with a bottoming cycle powered by the GT exhaust gasses. In this case, the standard solution would be to use a water Steam Rankine Cycle (SRC). However, even if this technology the SRC usually yields the best efficiency, other technologies alternatives are often preferred on the lower size scale. Organic Rankine Cycles (ORCs) are the commercial alternatives to SRC Steam Rankine Cycles, but many other alternative cycles exist or can be developed, with potential benefits from safety, technical or economic points of view. This study compares several alternative technologies suited to recover GT gas turbine waste heat, and a detailed cost analysis for each is presented. On this basis, a guideline is proposed for the technology choice considering a wide range of application sizes and temperature levels typical for waste heat recovery from GTs gas turbines. The compared technologies are ORCs, Rankine Cycles (RCs) with water and ammonia mixtures at constant composition, supercritical CO2 cycles (sCO2), sCO2 cycles with mixtures of CO2, and other gasses. As it resulted, ORCs can achieve the lowest levelized cost of energy (32 $/MWh – 46 $/MWh) if flammable fluids can be employed. Otherwise, RCs Rankine cycles with a constant composition mixture of water and ammonia are a promising alternative, reaching a Levelised Cost Of Energy (LCOE) of 36–58 $/MWh.
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Banner, Shannon C., John Classen, Prince Dugba, Mark Rice, and Kelly Zering. "Environmental Tradeoffs of Alternative Scenarios for Swine Waste Management Technologies: A Life Cycle Perspective." In 2017 Spokane, Washington July 16 - July 19, 2017. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2017. http://dx.doi.org/10.13031/aim.201700187.
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Zemba, Stephen G., James J. Binder, Michael R. Ames, and Richard R. Lester. "A Risk Assessment Framework for Evaluating Health Risks From New and Emerging Waste Management Technologies." In 18th Annual North American Waste-to-Energy Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/nawtec18-3537.
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Until recently, landfills and waste-to-energy (WTE) facilities were the two basic technologies available to process residual (post-recycled) municipal solid waste. These technologies have both advantages and drawbacks, and their relative merits have been debated many different ways. Risk assessments of both technologies have been used to examine their potential threats to human health and the environment, and have found both landfills and WTE facilities can be operated in an environmentally acceptable manner. Neither alternative, however, has gained general public acceptance, and planned projects are often controversial. There remains considerable skepticism, for example, that landfill liners will be effective over long periods of time, and a general uneasiness over the safety of waste combustion. The interest in emerging conversion technologies, such as gasification and anaerobic digestion, as an alternative to conventional landfills and WTE facilities is thus understandable. However, there is some concern that the environmental impacts of conversion technologies are not well understood, as no commercial facilities exist in the United States. Development of a risk assessment framework for evaluating conversion technologies will serve two purposes. First, it will ultimately facilitate objective evaluation of potential risks to health and the environment as well as comparative evaluation with respect to traditional landfill and WTE technologies. Second, it will initiate a conceptual model of environmental impacts that will be useful in identifying key emissions and data gaps. Our presentation will set forth an initial risk assessment framework, focusing on the emissions and residuals of conversion technologies, and using available data to characterize and project health risk impacts.
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Dobrovolsky, I., I. Kapkaev, and D. Sorokin. "Economic and Technological Prospects of Solid Waste Pyrolysis as an Alternative Energy Source." In 2020 International Multi-Conference on Industrial Engineering and Modern Technologies (FarEastCon). IEEE, 2020. http://dx.doi.org/10.1109/fareastcon50210.2020.9271213.
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Gershman, Harvey W. "The Latest and Greatest on the Resurgence of Waste-to-Energy and Conversion Technologies." In 18th Annual North American Waste-to-Energy Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/nawtec18-3503.
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This presentation will provide a historical perspective on the development of waste-to-energy (WTE) and conversion technologies in the 1970s and 1980s. During this time period, U.S. EPA provided grant assistance to a variety of projects and technologies including refuse derived fuel (RDF) production, RDF combustion, pyrolysis, gasification and anaerobic digestion. This presentation will also provide the latest, up-to-date information about WTE and alternative technologies, including data on costs, and current status of projects developing across North America as they exist in 2010. It will provide a review of WTE technologies as an element of integrated solid waste management systems and highlight some of the advances which have been moved into production units to make WTE environmentally friendly. It will also include a brief look at plants worldwide, followed with a focus on facilities, technologies and companies operating in the U.S. Specific examples of technologies and associated facilities will include: –Mass Burn; –Modular; –RDF - Processing & Combustion; –RDF - Processing Only; –RDF - Combustion Only. Municipal waste combustors are regulated under the federal Clean Air Act (CAA), originally passed by Congress in 1963 and amended in 1967, 1970, 1977, 1990 and 1995 and 1998. The U.S. EPA may implement and enforce the requirements or may delegate such authority to state or local regulatory agencies. The CAA places emissions limits on new municipal waste combustors. In addition, the 1995 amendments to the Clean Air Act (CAA) were developed to control the emissions of dioxins, mercury, hydrogen chloride and particulate matter. By modifications in the burning process and the use of activated carbon injection in the air pollution control system, dioxins and mercury, as well as hydrocarbons and other constituents, have effectively been removed from the gas stream. The presentation will also review the companies offering WTE in the form of alternative technologies being promoted and considered in the U.S., and several recent and current procurements will be reviewed. GBB tracks over 150 different companies offering technologies, facilities and services whose developmental stages range from engineering drawings and laboratory models to full-scale operating prototypes. The presentation will provide an overview of these systems and their status. Implementation of new WTE projects — whatever technology is selected — will involve local governments in the process because MSW management is a local responsibility. Implementation will involve risks for local government and any private entities involved. A comprehensive review of the risks and challenges associated with implementing various technologies will be provided. The presentation will conclude with key elements to keep in mind when implementing WTE and/or conversion technologies. The last new MSW-processing WTE facility constructed in the U.S. commenced operations in 1996. Since that time, no new greenfield commercial plant has been implemented. In the past few years, however, interest in WTE and waste conversion has begun to grow, again. This renewed interest in waste processing technologies is due to several factors: successful CAA retrofits, proven WTE track record, increasing cost of fossil fuels, growing interest in renewable energy, concern of greenhouse gases, reversal of the Carbone Supreme Court Case, and the change in U.S. EPA’s hierarchy, which now includes WTE. Since 2004, several municipalities commissioned reports in order to evaluate new and emerging waste management technologies and approaches. These will be summarized. With the passage of the American Recovery and Reinvestment Act of 2009, the U.S. DOE has been working to advance innovative green energy technologies, which can be applied to MSW as well as other bio-feedstocks. DOE has made a number of grant awards to projects where MSW is used as a feedstock. This presentation will summarize the status of these projects and discuss how they should be viewed when considering new projects. The presentation will also outline policies for governments to consider when considering recycling goals with WTE. This review will be done in the context of environmental and energy considerations as well as public policy considerations. Comments will be included regarding current legislation and regulations, specifically for greenhouse gas emissions, being considered by the U.S. or state governments. The presentation will provide participants with: –A historical reference for experiences with WTE/alternative technologies in the U.S. in the 1970s and 1980s; –Latest information on the state of WTE/alternative technologies in the U.S., including their environmental performance; –A global understanding of current technologies and trends; –Understanding of the risks and challenges associated with implementing various technologies; –Understanding the key elements to keep in mind when implementing WTE; –Suggested policy for recycling and WTE to co-exist as components of a local solid waste system; and –Comments about current legislation being considered by the U.S. and state governments.
Reports on the topic "Alternative waste technologies"
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Borduin, L. C., B. A. Palmer, and J. A. Pendergrass. Mixed waste focus area alternative technologies workshop. Office of Scientific and Technical Information (OSTI), May 1995. http://dx.doi.org/10.2172/90169.
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Schwinkendorf, W. E., B. C. Musgrave, and R. N. Drake. Evaluation of alternative nonflame technologies for destruction of hazardous organic waste. Office of Scientific and Technical Information (OSTI), April 1997. http://dx.doi.org/10.2172/578607.
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Asvapathanagul, Pitiporn, Leanne Deocampo, and Nicholas Banuelos. Biological Hydrogen Gas Production from Food Waste as a Sustainable Fuel for Future Transportation. Mineta Transportation Institute, July 2022. http://dx.doi.org/10.31979/mti.2021.2141.
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In the global search for the right alternative energy sources for a more sustainable future, hydrogen production has stood out as a strong contender. Hydrogen gas (H2) is well-known as one of the cleanest and most sustainable energy sources, one that mainly yields only water vapor as a byproduct. Additionally, H2 generates triple the amount of energy compared to hydrocarbon fuels. H2 can be synthesized from several technologies, but currently only 1% of H2 production is generated from biomass. Biological H2 production generated from anaerobic digestion is a fraction of the 1%. This study aims to enhance biological H2 production from anaerobic digesters by increasing H2 forming microbial abundance using batch experiments. Carbon substrate availability and conversion in the anaerobic processes were achieved by chemical oxygen demand and volatile fatty acids analysis. The capability of the matrix to neutralize acids in the reactors was assessed using alkalinity assay, and ammonium toxicity was monitored by ammonium measurements. H2 content was also investigated throughout the study. The study's results demonstrate two critical outcomes, (i) food waste as substrate yielded the highest H2 gas fraction in biogas compared to other substrates fed (primary sludge, waste activated sludge and mixed sludge with or without food waste), and (ii) under normal operating condition of anaerobic digesters, increasing hydrogen forming bacterial populations, including Clostridium spp., Lactococcus spp. and Lactobacillus spp. did not prolong biological H2 recovery due to H2 being taken up by other bacteria for methane (CH4) formation. Our experiment was operated under the most optimal condition for CH4 formation as suggested by wastewater operational manuals. Therefore, CH4-forming bacteria possessed more advantages than other microbial populations, including H2-forming groups, and rapidly utilized H2 prior to methane synthesis. This study demonstrates H2 energy renewed from food waste anaerobic digestion systems delivers opportunities to maximize California’s cap-and-trade program through zero carbon fuel production and utilization.
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Asvapathanagul, Pitiporn, Leanne Deocampo, and Nicholas Banuelos. Biological Hydrogen Gas Production from Food Waste as a Sustainable Fuel for Future Transportation. Mineta Transportation Institute, July 2022. http://dx.doi.org/10.31979/mti.2022.2141.
Full textAbstract:
In the global search for the right alternative energy sources for a more sustainable future, hydrogen production has stood out as a strong contender. Hydrogen gas (H2) is well-known as one of the cleanest and most sustainable energy sources, one that mainly yields only water vapor as a byproduct. Additionally, H2 generates triple the amount of energy compared to hydrocarbon fuels. H2 can be synthesized from several technologies, but currently only 1% of H2 production is generated from biomass. Biological H2 production generated from anaerobic digestion is a fraction of the 1%. This study aims to enhance biological H2 production from anaerobic digesters by increasing H2 forming microbial abundance using batch experiments. Carbon substrate availability and conversion in the anaerobic processes were achieved by chemical oxygen demand and volatile fatty acids analysis. The capability of the matrix to neutralize acids in the reactors was assessed using alkalinity assay, and ammonium toxicity was monitored by ammonium measurements. H2 content was also investigated throughout the study. The study's results demonstrate two critical outcomes, (i) food waste as substrate yielded the highest H2 gas fraction in biogas compared to other substrates fed (primary sludge, waste activated sludge and mixed sludge with or without food waste), and (ii) under normal operating condition of anaerobic digesters, increasing hydrogen forming bacterial populations, including Clostridium spp., Lactococcus spp. and Lactobacillus spp. did not prolong biological H2 recovery due to H2 being taken up by other bacteria for methane (CH4) formation. Our experiment was operated under the most optimal condition for CH4 formation as suggested by wastewater operational manuals. Therefore, CH4-forming bacteria possessed more advantages than other microbial populations, including H2-forming groups, and rapidly utilized H2 prior to methane synthesis. This study demonstrates H2 energy renewed from food waste anaerobic digestion systems delivers opportunities to maximize California’s cap-and-trade program through zero carbon fuel production and utilization.
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Author, Not Given. Data summary of municipal solid waste management alternatives. Volume 4, Appendix B: RDF technologies. Office of Scientific and Technical Information (OSTI), October 1992. http://dx.doi.org/10.2172/10138540.
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Author, Not Given. Data summary of municipal solid waste management alternatives. Volume 3, Appendix A: Mass burn technologies. Office of Scientific and Technical Information (OSTI), October 1992. http://dx.doi.org/10.2172/10137774.
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Jang, B. W., J. J. Spivey, C. R. Savage, and R. B. Timmons. Comprehensive Evaluation of Catalytic Hydroreduction and Nonthermal Plasma as Alternative Technologies for Detoxification of Chemical Wastes. Fort Belvoir, VA: Defense Technical Information Center, September 2001. http://dx.doi.org/10.21236/ada396448.
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Author, Not Given. Data summary of municipal solid waste management alternatives. Volume 7, Appendix E -- Material recovery/material recycling technologies. Office of Scientific and Technical Information (OSTI), October 1992. http://dx.doi.org/10.2172/10137454.
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Pelletier, Austin, Amanda Hohner, Idil Deniz Akin, Indranil Chowdhury, Richard Watts, Xianming Shi, Brendan Dutmer, and James Mueller. Bench-scale Electrochemical Treatment of Co-contaminated Clayey Soil. Illinois Center for Transportation, June 2021. http://dx.doi.org/10.36501/0197-9191/21-018.
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Industrial soil contamination is frequently unearthed by transportation agencies during construction within the right-of-way. As a result, transportation agencies may experience construction delays. Soils co-contaminated with high-molecular-weight polycyclic aromatic hydrocarbons (HMW-PAHs) and metals are commonly encountered in Illinois and exhibit recalcitrance towards conventional treatment technologies. This issue is exacerbated in the fine-grained soils common to Illinois, where low-permeability and immense sorption capacity increase treatment complexity, cost, and duration. Contaminated sites are spatially and temporally restrictive and require rapid in situ treatments, whereas conventional soil remediation requires 1 to 3 years on average. Consequently, transportation agencies typically pursue excavation and off-site disposal for expediency. However, this solution is expensive, so a comparatively expeditious and affordable treatment alternative is needed to combat the increasing cost of hazardous waste disposal. The objective of this work was to develop an accelerated in situ treatment approach adaptable for use at any construction site to cost-effectively remove HMW-PAHs and metals from clayey soil. It was hypothesized that an in situ electrochemical treatment which augments electrokinetics with H2O2 could remediate both HMW-PAHs and metals in less than a month. Bench-scale reactors resemblant of field-scale in situ electrokinetic systems were designed and fabricated to assess the electrochemical treatment of clayey soils contaminated with HMW-PAHs and metals. Pyrene, chromium, and manganese were used as model contaminants, spiked into kaolinite as a model clay. Electrokinetics were imposed by a low-intensity electrical field distributed by graphite rods. Electrolytic H2O2 systems were leveraged to distribute electrical current and facilitate contaminant removal. Average contaminant removals of 100%, 42.3%, and 4.5% were achieved for pyrene, manganese, and chromium, respectively. Successful development of this bench-scale treatment approach will serve to guide transportation agencies in field-scale implementation. The results from this work signify that electrochemical systems that leverage eco-friendly oxidant addition can replace excavation and disposal as a means of addressing clayey soils co-contaminated with HMW-PAHs and metals.