Academic literature on the topic 'Antifreeze solutions – Environmental aspects'
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Journal articles on the topic "Antifreeze solutions – Environmental aspects"
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Bar-Dolev, Maya, Yeliz Celik, J. S. Wettlaufer, Peter L. Davies, and Ido Braslavsky. "New insights into ice growth and melting modifications by antifreeze proteins." Journal of The Royal Society Interface 9, no. 77 (July 11, 2012): 3249–59. http://dx.doi.org/10.1098/rsif.2012.0388.
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Antifreeze proteins (AFPs) evolved in many organisms, allowing them to survive in cold climates by controlling ice crystal growth. The specific interactions of AFPs with ice determine their potential applications in agriculture, food preservation and medicine. AFPs control the shapes of ice crystals in a manner characteristic of the particular AFP type. Moderately active AFPs cause the formation of elongated bipyramidal crystals, often with seemingly defined facets, while hyperactive AFPs produce more varied crystal shapes. These different morphologies are generally considered to be growth shapes. In a series of bright light and fluorescent microscopy observations of ice crystals in solutions containing different AFPs, we show that crystal shaping also occurs during melting. In particular, the characteristic ice shapes observed in solutions of most hyperactive AFPs are formed during melting. We relate these findings to the affinities of the hyperactive AFPs for the basal plane of ice. Our results demonstrate the relation between basal plane affinity and hyperactivity and show a clear difference in the ice-shaping mechanisms of most moderate and hyperactive AFPs. This study provides key aspects associated with the identification of hyperactive AFPs.
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Bartolini, Nicola, Alessandro Casasso, Carlo Bianco, and Rajandrea Sethi. "Environmental and Economic Impact of the Antifreeze Agents in Geothermal Heat Exchangers." Energies 13, no. 21 (October 29, 2020): 5653. http://dx.doi.org/10.3390/en13215653.
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Borehole heat exchangers (BHEs) generally employ water-antifreeze solutions to allow working fluid temperatures to fall below 0 °C. However, some local regulations have forbidden antifreeze additives (even non-toxic ones) to avoid groundwater pollution in case of pipe leakage. This paper presents a techno-economic and environmental analysis of four different fluids: propylene glycol at 25% and 33% weight concentrations, calcium chloride at 20% weight concentration (CaCl2 20%), and pure water. Thermal loads from 36 case studies in six different climate zones are used to perform BHE sizing and compare the abovementioned fluids from the economic, operational, and environmental points of view. The economic analysis and the carbon footprint assessment are performed on a life cycle of 25 years considering the installation (BHE drilling, fluid) and operation (heat pump and ground-side circulation pump energy demand, fluid replacement) of the simulated GSHPs. Results highlight that using pure water as a heat carrier fluid is convenient for cooling-dominated buildings but, for heating-dominated buildings, this choice leads to a noticeable increase of the BHE needed length which is not compensated by the lower operational costs. On the other hand, avoiding the use of antifreeze additives generally leads to a reduction of the lifetime carbon footprint, with a few exceptions in very cold climates. CaCl2 20% proves to be a good choice in most cases, both from the economic and the environmental points of view, as it allows a strong reduction of the installed BHE length in cold climates with a low additional cost and carbon footprint.
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POPA, Mădălin-Florin, and Bogdan Manolin JURCHIȘ. "Analysis of the Wear Process of the Elements in the Braking System of Heavy Trucks." Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science 44, no. 4 (December 15, 2021): 72–78. http://dx.doi.org/10.35219/mms.2021.4.13.
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Today's commercial vehicles work in a very competitive environment, in an extremely active economic market and the requirements for the delivered performance make it imperative to study in detail each component element. In practice, all these aspects are found in the process of wearing the elements of different systems. Moreover, major changes are expected for the near future of motor vehicles in order to improve the ecological balance both by reducing the pollutant emissions of the propellants and by improving the percentage of recyclability and reduction of waste from maintenance (liquids and solutions such as oils, antifreeze or solutions with different detergents). In order to identify solutions to improve the mentioned problems, the current study analyses the types of wear identified in the elements of the braking system of commercial vehicles and their main factors of influence. The study is based on data obtained during analysis during operation for a number of trucks with different configurations.
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Sineeva, Natalya. "Some aspects of sustainable urban planning using environmental solutions." IOP Conference Series: Earth and Environmental Science 937, no. 4 (December 1, 2021): 042024. http://dx.doi.org/10.1088/1755-1315/937/4/042024.
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Abstract The ecological aspect of urbanization is reflected in the fact that cities are increasingly concentrating all types of environmental pollution, which become serious problems of the deteriorating of people living conditions. In the Future megalopolises more than 70% of the population will live in the next few decades according to the UN report. It is necessary to make all conditions for the ideas implementation of comfortable and safe cities. Research and innovation of ecological solutions for eco-cities includes four directions. The article discusses one of them, it is the Enhancing the sustainable urbanization, its classification, which include the sustainable Urban Planning with the Sustainable Drainage System (SuDS) approach. The article provides functions and advantages of SuDS systems. Particular attention is paid to the zones of forgotten urban spaces. These zones can improve business and residential areas, as multi-functional design with nature can create new dynamic spaces that increase property values, thereby attracting investors, improving citizens’ well-being. The article provides some examples of draft designs for the improvement of the coastal zones of the Yeltsovka-2 River, located in the area of Zaeltsovsky Park.
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Ptashnyk, Vadym, Ihor Bordun, Volodymyr Pohrebennyk, Sabina Ziembowicz, Małgorzata Kida, and Piotr Koszelnik. "Aspects of Electrochemically Activated Water Solutions Practical Use." Journal of Ecological Engineering 21, no. 7 (October 1, 2020): 222–31. http://dx.doi.org/10.12911/22998993/125588.
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Raschke, Anna, J. Sebastian Hernandez-Suarez, A. Pouyan Nejadhashemi, and Kalyanmoy Deb. "Multidimensional Aspects of Sustainable Biofuel Feedstock Production." Sustainability 13, no. 3 (January 29, 2021): 1424. http://dx.doi.org/10.3390/su13031424.
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Bioenergy is becoming increasingly relevant as an alternative to fossil fuels. Various bioenergy feedstocks are suggested as environmentally friendly solutions due to their positive impact on stream health and ability to sequester carbon, but most evaluations for bioenergy feedstocks have not evaluated the implications of bioenergy crop production holistically to date. Through the application of multi-objective optimization on 10 bioenergy feedstock rotations in a Michigan watershed, a Pareto front is searched to identify optimal trade-off solutions for three objective functions representing stream health, environmental emissions/carbon footprint, and economic feasibility. Various multi-criteria decision-making techniques are then applied to the resulting Pareto front to select a set of most-preferred trade-off solutions, which are compared to optimal solutions from each individual objective function. The most-preferred trade-off solutions indicate that a diverse mix of rotations are necessary to optimize all three objectives, whereas the individually optimal solutions do not consider a diverse range of feedstocks, thereby making the proposed multi-objective treatment an important and pragmatic strategy.
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Heeney, P. L., and G. W. Heinke. "Disposal of hazardous wastes in Canada's Northwest Territories." Canadian Journal of Civil Engineering 19, no. 5 (October 1, 1992): 806–10. http://dx.doi.org/10.1139/l92-091.
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In the past decade, many jurisdictions have attempted to estimate the quantities and types of hazardous wastes generated within their boundaries. Similar studies done in the Northwest Territories (N.W.T.), Canada, are out-of-date, incomplete, or specific to only one type of wastes or geographic location. In 1990, an industry, business, and community survey was conducted to determine the types and quantities of hazardous wastes generated in the N.W.T. and the currently used disposal methods for these wastes. It revealed that 2500 tonnes of hazardous wastes were generated each year, including waste oil and petroleum products, fuel tank sludges, acid batteries, spent solvents, antifreeze, and waste paint.In many regions, disposal of these wastes may be routine, but waste disposal in arctic and subarctic regions presents unique difficulties. Severe climate, expense of transportation, isolation, and small quantities of wastes generated can make standard solutions expensive, difficult, or impossible to apply. Unique solutions are needed for northern waste disposal. The aim of this paper is to give an overview of low-cost, on-site or local hazardous waste disposal options that can be applied in the N.W.T. and also in other arctic, remote, or less-developed regions. Key words: hazardous wastes, Northwest Territories, cold climate regions, waste disposal.
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Сидельникова, Ксения, Kseniya Sidelnikova, Анна Иволга, Anna Ivolga, Яна Карнаухова, and Yana Karnaukhova. "DEMOGRAPHIC ASPECTS OF RURAL TOURISM: PROBLEMS AND SOLUTIONS." Services in Russia and abroad 10, no. 7 (November 7, 2016): 134–43. http://dx.doi.org/10.12737/21833.
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The contemporary relevance of ensuring sustainable rural development stems from the growing economic and social backwardness of rural territories on the one hand, and their ultimate importance for the state in the context of food security, preservation of soil and environmental resources, and the use of agricultural, production and labour potentials on the other hand. One of the key conditions for sustainable rural development is population strength- ening in rural areas and its sufficient employment. The article analyzes the current demographic problems of rural development, based on the example of Stavropol region. The authors describe threats to sustainable rural development such as unemployment and depopulation, as well as substantiate the practicality of diversification of traditional rural sources of income by means of tourism and other alternative activities.
The research is performed on the base of actual materials and the results of studies related to the rural tourism development, and also using the authors´ observations. The authors have used monographic, sociological, economicstatistical methods of research, the systematic approach and comprehensive analysis.
Rural tourism today should be seen as an important development direction of entrepreneurship and diversification in rural areas, as one of the important areas of sustainable development, and as a form and the chance of economic, social and cultural revitalization of rural areas as a whole. This makes the study of essence and prospects of this business direction development of high priority.
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Kłos, Zbigniew. "Introduction of environmental aspects in designing of machines." MATEC Web of Conferences 254 (2019): 01001. http://dx.doi.org/10.1051/matecconf/201925401001.
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Until now, in designing, an engineer’s main task was to find solutions for practical problems including limitations of mainly material, technological and economical nature. Recently it was stated that environmental aspects need to be included as well in any design algorithm to provide low environmental impact profile of any technical object. In this paper, the example of use of the tool oriented at environment impact analysis – Life Cycle Assessment (LCA) – in the design stage of technical objects, is presented. The environmental analysis is done on the wrapping machine, with the special interest given to its gear transmission. Using LCA, environmental profiles and environmental indices for different constructions of gear wheels are elaborated and on this basis, an environmentally optimal combination of materials for elements of transmission gear: shaft, gear wheels and body is proposed. The analysis of results brings interesting observations and conclusions, important and useful for both machine designers and producers.
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Miryuk, Olga. "Environmental Aspects of Resource-Saving Cement Technology." Environmental and Climate Technologies 25, no. 1 (January 1, 2021): 803–15. http://dx.doi.org/10.2478/rtuect-2021-0060.
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Abstract The article outlines the main problems that the cement industry causes to the environment. Authors propose technological solutions aimed at resource-saving in cement production and environmental protection. The research is devoted to low-energy cement obtained on the basis of waste from processing skarn-magnetite ores. The characteristics of the composition and properties of the technogenic material are given. The authors have justified the feasibility of using skarn-magnetite ore enrichment waste as a part of a cement raw material mixture. The possibility of changing the composition of cement by reducing the energy-intensive alite phase is demonstrated. Technological and heat engineering calculations confirming the reduction of natural mineral raw materials and fuel costs in the production of cement were carried out. The processes of hydration of the developed cements have been investigated. A method for accelerating the hardening of low-base cements due to mechanical activation, the introduction of mineral additives and a modifier is proposed. The research revealed construction and technological advantages of the developed cements, which exhibit increased resistance during operation in an aggressive environment. Physical and mechanical tests of concretes made of low-base cement were carried out. The possibility of reducing the temperature during the heat treatment of concrete is proved. Physical and mechanical tests of concretes made of low-base cement were carried out. The paper presents environmental benefits of the developed cement technology.
Dissertations / Theses on the topic "Antifreeze solutions – Environmental aspects"
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Zoannou, Kali-Stella. "Aspects of degradation of monoethanolamine solutions during Co2 absorption." Thesis, Cardiff University, 2011. http://orca.cf.ac.uk/18346/.
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The most common technique for carbon dioxide removal from gaseous streams is amine scrubbing, a proven technology in the oil and gas industries. The use of this route in coal fired power plants is not fully understood and the likelihood of solvent degradation is high. Decreased absorption efficiency, undesirable byproducts, the environmental impact of their disposal and increased process costs are the main consequences. In this study, two experimental rigs were designed and commissioned to explore the effects of gas composition and temperature on monoethanolamine degradation. Analytical procedures to detect and quantify its major thermal and oxidative degradation products were also developed. It became apparent early on that solvent degradation, under actual plant conditions, is a slow phenomenon, thus, it was decided to focus on thermal degradation. The present study uniquely enabled the absorption/desorption behaviour of thermally degraded solvents to be evaluated. The major thermal degradation products were quantified. After 14 full absorption/stripping cycles at the presence of 16% oxygen and 15% carbon dioxide, significant concentrations of nitrites and nitrates were detected in the samples. Thermal degradation at 160 oC for 8 weeks reduced monoethanolamine concentration by almost 95%, as evidenced by the chemical analysis, but the remaining solvent retained 22% of its capacity to remove carbon dioxide. Therefore, although not fully quantified, the requirement for monoethanolamine make-up may not be quite as serious as initially believed. There is some evidence to support that the rate of thermal degradation was enhanced as carbon dioxide loading increased and a 20% higher MEA loss was determined in the samples with the rich initial molar loading. A range of degradation products were quantified that correspond to those cited in the literature. 1-(2-hydroxyethyl)-2-imidazolidinone was indicated as the most stable MEA degradation product in the degraded samples at concentrations of up to 17% v/v.
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Chychko, Andrei. "Energy and environmental optimization of some aspects of EAF practice with novel process solutions." Doctoral thesis, KTH, Materialens processvetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-24486.
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The objective of the present thesis is to optimize the electric arc furnace (EAF) practice from an environmental view point. Two aspects that meet the requirements of the secondary steelmaking industries today, viz. Mo alloying with maximum retainment of the alloying element in molten steel and optimization of foaming by carbonate addition with a view to optimize the energy need of the process. Both these aspects would also have a significant impact on the process economy. Iron molybdate (Fe2MoO4) has been synthesized from commercial grade materials and proposed as a new potential precursor for steel alloying with Mo. The thermal stabilities of different molybdates, viz. Fe2MoO4, CaMoO4 and MgMoO4, were studied using thermogravimetry analysis (TGA). It was found that Fe2MoO4 is the most stable one and doesn’t evaporate in Ar atmosphere when heating up to 1573 K. The synthesis of Fe2MoO4 requires high temperature (1373 K) and long holding time (up to 16 hours). In a view of this, the possibilities for in-situ formation of Fe2MoO4 and CaMoO4 from their precursor mixtures were studied with the aid of high-temperature X-ray diffraction (XRD) and TGA analysis. Laboratory and industrial trials on steel alloying with Mo were conducted using precursor mixtures as sources of Mo. It was found that the mixture, which contains FeOx, MoO3 and C (Fe2MoO4 precursor), can provide the Mo yield up to 98 % at both the laboratory as well as industrial trials. The Mo yields even in the case of C+MoO3 and C+MoO3+CaO mixtures were around 93 % in these trials. The higher yield for the MoO3+C+FeOx mixture was attributed to the stabilization of Mo in the precursor (marked by the decrease in the Gibbs energy of Mo) and the readiness to dissolve in the steel bath. The heat effect of the slag foaming with carbonates addition was studied at 1623 and 1673 K with the aid of thermal analysis technique with a new crucible design. Experiments were conducted by adding limestone and dolomite pieces of defined shapes (together with iron sinkers) in molten slag and monitoring the temperature changes accompanying the decomposition of carbonates. It was found that the decomposition energies for dolomite and limestone for the studied slag composition are in the range 56-79 % of theoretical values, which is linked to the energy saving effect of slag foaming. No influence of sample shape on decomposition energy was found both for limestone and dolomite. The kinetics of slag foaming by limestone particles was studied at 1773 K with the aid of X-ray imaging system. A model was proposed to describe the decrease in foam height with time on the basis of CaO shell formation during decomposition reaction. The energy impact of limestone and raw dolomite addition was examined in a 100-ton EAF. It was found that, in the case of addition of carbonates after the scrap is completely molten; the endothermic heat effects for limestone and dolomite (2255 and 2264 kJ/kg respectively) were only 70 % from theoretical values. This is indicative of the resistance to heat transfer due to increased foaming.QC 20100914
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Choi, Kit-hing, and 蔡結馨. "The bleaching and dyeing industry in Hong Kong: environmental problems and some solutions." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1997. http://hub.hku.hk/bib/B31253726.
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Li, Jun, and 李駿. "A decision tool for selecting low-carbon refurbishment solutions for multi-storey residential buildings in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/208002.
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The pressure to reduce greenhouse gas (GHG) emissions has become increasingly obvious due to the need to alleviate the impact of climate change. As the second largest GHG emitter in the world, the building sector should play an active role in reducing GHG emissions. Particular attention should be directed to existing buildings not only because of the amount of emissions caused by inefficient buildings but also due to the existence of a variety of sustainable refurbishment solutions for different levels and stages of building refurbishment. The emission reduction performance of different sustainable refurbishment options may vary enormously as a result of different building design conditions. With the majority of residential properties being high-rise buildings, the most suitable sustainable refurbishment options for a sub-tropical city like Hong Kong are yet to be fully investigated. The opportunity to reduce emission may not be high without a tool to help the owners, occupants and consultants to assess the emission of different refurbishment solutions for multi-storey residential building.
The aim of this research has been to develop a systematic decision tool to identify suitable sustainable refurbishment solutions for multi-story residential buildings in subtropical regions like Hong Kong and to calculate the CO2emission reductions of these solutions. The research began with a comprehensive literature review of the existing sustainable refurbishment approaches. The results of this literature review formed the basis for a preliminary screening according to local climate and buildings features. Interviews with experts and questionnaire surveys with residents were carried out in order to confirm the applicability of the proposed approaches. Then, based on a case study, this research established a set of methods, through literature review and energy simulation, to calculate the CO2 emission reductions achievable by sustainable refurbishment. With the setup of criteria for identifying applicable refurbishment solutions, method of calculation of CO2 emission reductions and parameter input/output and user interface design, a decision tool was developed for sustainable refurbishment. Finally, a series of interviews was conducted to validate the major research outcomes.
In this study, a residential building is divided into two zones, the common area and those occupied by owners/tenants. This study further identifies possible sustainable refurbishment solutions for each area, which can provide stakeholders with a variety of options for launching sustainable refurbishment projects. Moreover, a theoretical framework for emission assessment, consisting of system boundary and calculation methods, is also proposed in this study, which can provide better calculation of emission reductions as a result of various sustainable refurbishment solutions. The most significant outcome of this project is a decision tool which can generate a set of sustainable refurbishment solutions and calculate CO2 emission reductions according to the architectural features input by users. With the function of identifying the approaches for reducing CO2emission, owners and occupants of existing residential buildings can minimize the CO2emissions of their properties through refurbishing some of the building components in a sustainable manner.published_or_final_version
Civil Engineering
Master
Master of Philosophy
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Uddin, G. M. Saleh. "Groundwater contamination by arsenic in Bangladesh : causes, consequences and solutions." Title page, table of contents and abstract only, 2001. http://web4.library.adelaide.edu.au/theses/09ENV/09envu18.pdf.
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Gupta, Ankur Kumar. "Measurement of Henry's constants of volatile organic compounds in aqueous solutions using headspace gas chromatography." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/11209.
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Zhao, Ming. "Removal and recovery of heavy metals from synthetic solutions and electroplating effluents using yeast and the water fern Azolla filiculoides." Thesis, Rhodes University, 1998. http://hdl.handle.net/10962/d1004061.
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The aims of the project were twofold. The initial objective of the study, based on previous results, was to develop an economically viable methodology for immobilizing yeast cells for the treatment of heavy metal-laden waste water. The non-viable yeast cross-linked by 13% (w/v) formaldehyde/1N HNO₃ exhibited satisfactory mechanical strength and rigidity in a continuous-flow column operation. No apparent disruption of the biomass after repeated use was observed. The cost of immobilizing 1kg dry yeast pellets was estimated at less than US$I. Zn uptake capacity of FA-cross-linked pellets, on batch trials, remained similar to that of raw yeast, reflecting that the immobilizing procedure did not hinder its metal removing capacity. In column studies, cation metals were effectively removed by the yeast pellets from aqueous solution at natural pHs, and then recovered completely by washing the pellets in situ with O.1M HCl. The recovered metals were concentrated in such small volumes that recycling or precipitation of them was facilitated. The metal uptake capacity of the regenerated biomass remained constant in comparison with cycle 1, indicating that reuse of the yeast would be possible. In the case of Cr⁶⁺, a gradual breakthrough curve of Cr in the column profile was noted, with a simultaneous reduction of Cr⁶⁺ to Cr³⁺. However, Cr⁶⁺ in the effluent can be markedly minimised either by accumulation onto the biomass or reduction to its trivalent form. Desorption of bound Cr⁶⁺ with either alkali or salt could not accomplish the regeneration of the biomass. A combination of reduction and desorption with FA/HNO₃ appeared promising in regeneration of the saturated biomass at 4°C. The metal sorption capacities of the yeast pellets, on a batch or a fixed-bed system are relatively lower than that of documented sorbents. Apparently more of the yeast pellets would be required for treating a certain volume of waste effluent, than with other sorbents. Therefore Azolla filiculoides was examined as a suitable sorbent for this purpose. This constitutes the second part of the project. Azolla filiculoides, a naturally-abundant water fern, was screened for its metal sorption and recovering capacities, mechanical stability, flow-permeability and reusability. The azolla biomass appeared to have fulfilled the required mechanical criteria during the repeated sorption-desorption column operations. It is water-insoluble and appears flexible under pressure when rinsed with water. These characters are of crucial importance in a continuous-flow system since a column can be operated at high flow rates without apparent compact of the biomass and pressure loss. Therefore, immobilization of the biomass can be avoided. The sorption isotherm data, obtained from batch removal of Cr⁶⁺, showed that the sorption process was effective, endothermic and highly pH dependent. Considerable amounts of Cr⁶⁺ were accumulated at the optimum pHs of 2-2.5. Column sorption of Cr⁶⁺ at a low flow rate and pH of 2.5 showed optimum performance with a total Cr uptake of 50.4mg/g at 60% saturation of the biomass. Removal of Cr⁶⁺ from an electroplating effluent using an azolla column was deemed reasonably satisfactory, although the uptake declined slightly. Desorption of bound Cr⁶⁺ with various desorbents was incomplete, which resulted in a low regeneration efficiency of about 50%. However, removal and recovery of Cr³⁺ using the azolla column was than that of Cr⁶⁺. Desorption of Cr³⁺ from the spent biomass column was accomplished with the recovery of 80% using O.5N H₂SO₄, The regeneration efficiencies for Cr³⁺ removal were up to 90% and demonstrated that the biomass is reusable. Cation metal uptake capacities of azolla, obtained either from batch or column experiments, are reasonably high in comparison with other sorbents. The uptake of Ni or Zn ions from solution is pH dependent showing the optimum pH of around 6 to 6.5, under the current experimental conditions. The sorption kinetics for cation metals was rapid with about 80% of the bound Ni ions being taken up in the first 10 min. The character of rapid binding is extremely important in a column sorption process, especially on a large scale since it favours an optimum uptake of metals at high flow rates. The Ni or Zn uptakes in column sorption were not markedly affected when the flow rates were increased from 80mllh up to 800ml/h for the 5g biomass used. The cation heavy metals removed from waste effluents were recovered in a concentrated solution of small volume. The desorption of bound Ni and Zn ions from the saturated biomass was accomplished with either O.2N HCl or H₂SO₄ that resulted in recoveries of more than 95%. The metals recovered, in the case of Ni and Zn, are identical to that of plating agents ego nickel sulphate or chloride, so that recycling of the metals is possible. An effluent-free, closed loop of Ni or Zn treatment system was proposed, whereby the Ni or Zn ions can be recycled to the plating bath whilst the purified water is fed back to the rinse tanks. Ca and Mg ions, commonly present in the electroplating effluents, appeared to affect sorption of heavy metals by azolla when metal concentrations were relatively low, presumedly through its competitive binding for the shared sites on surfaces of azolla. The data obtained from column sorption of Ni and Zn follows the BDST model well, enabling the application of the model to predicting design parameters for scale-up of the biosorption column system. It is interesting that the values of metal uptake, expressed in molar quantities, obtained on respective single-metal solutions and the multiple metal system, are similar, implying that the mechanisms involved in the sorption of all metal cations are similar and that the binding sites on surfaces of azolla are probably shared by all cation metals. The surface of the biomass provides sites for metal binding estimated in the range of 0.45-0.57mmol/g, based on the current experiments. The biomass has a surface area of 429 m²/g and water retention of 14.3 ml/g. The functional groups on the surface of azolla were partially identified using chemical modification and metal binding comparison. Among the functional groups examined, carboxyl groups, provided by amino acids and polysaccharides, appeared to play an important role in metal cation binding. The infrared spectra of the samples support this conclusion.
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Smit, Georgina. "Sustainable energy solutions for the residences of Stellenbosch University." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/2103.
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Thesis (MPhil (Sustainable Development Planning and Management))--University of Stellenbosch, 2009.The research objective of this assignment is to investigate technological options for sustainable energy solutions in the residences of Stellenbosch University. Conventional energy systems are contributing towards the degradation of global environmental sustainability. An alternative energy future exists if sustainable energy solutions, via renewable energy or energy efficiency, are adopted but these solutions await the political will and institutional governance to be implemented. A niche group of universities are modelling themselves around the sustainable energy agenda. As institutional spaces of learning, research and breeding grounds for new ways of thinking, universities stand poised to engage future leaders with local solutions to global energy dilemmas. It is argued that sustainable energy is necessary, it is possible and other universities are implementing it in various formats. The author of this thesis, a student at Stellenbosch University, was prompted to ask: what opportunities exist for Stellenbosch University to implement sustainable energy? The research objective focused on end use energy efficiency as means, out of all the technical options theoretically possible today, to implement sustainable energy solutions in the residences of Stellenbosch University. The focus of end use efficiency was specific to water heating, lighting and appliance use, for which technical solutions exist. This exploratory research was conducted via a macro, secondary data analysis of the quantitative data which detailed the energy consumption of residences in kilowatt hours as well as a micro, case study to facilitate a qualitative and quantitative analysis of the behavioural and leadership dynamics involved with technological implementation. The findings revealed that end use energy efficiency is a possible means for sustainable energy use within the residences of Stellenbosch University. However, the use of heat pump water heating technology in the majority of the residences and the omission of air conditioning in the residences results that the greatest potential for energy efficiency measures are not available. The centralised kitchen infrastructure requires highly rated equipment to deal with the swift throughput of meal times during the residences. The remaining focus areas of energy consumption, residential living, therefore, poses the greatest opportunity for end use energy efficiency. This posits residential lighting and appliance use as the focal point of the investigation. The findings concluded recommended courses of action for the University, residential leaders and students. The holistic and integrated approach to the research objective, guided by systems thinking and ecological design, capacitates actors at three different levels to pro actively implement end use energy efficiency. A by product of the micro, case study was a tool which the new Green House Committee members can now use to identify key points of energy efficiency and energy conservation in their residences. The local solutions generated by this thesis significantly contributed towards taking the first step towards mitigating global, national and community problems. Sustainable energy solutions are necessary, available and being implemented in other universities. End use energy efficiency, as a means to sustainable energy, is necessary, available and possible to implement within the residences of Stellenbosch University.
Centre for Renewable and Sustainable Energy Studies
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Kritzinger, Brian. "An analysis of the residential user electricity market and the marketing of green electricity product solutions in the City of Cape Town." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/927.
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Thesis (MBA (Business Management)) -- University of Stellenbosch, 2009.AFRIKAANSE OPSOMMING: Hierdie navorsingstudie het ’n telefoniese vraelys behels wat aan die einde van 2007 deur 405 respondente voltooi is. Die doel van die vraelys was om die opinies van ’n verteenwoordigende steekproef Kaapstadse residensiële elektrisiteitsverbruikers te bepaal ten opsigte van kwessies wat verband hou met die opwekking, verkoop en gebruik van hernubare of groen elektrisiteit. Dit is gedoen ten einde ’n ingeligte formulering te kan doen van toepaslike groen elektrisiteitsprodukte vir verkoop aan die residensiële elektrisiteitsmark. Response is op Likert-skale aangedui en is geanaliseer deur middel van nie-parametriese statistiese metodologie. Daar is bevind dat ’n groot proporsie (90.6 persent) van die Kaapstadse verbruikers bewus is van en besorg is oor die huidige klimaats- en omgewingsuitdagings en dat ’n soortgelyke proporsie (86.9 persent) bekommerd is oor die gevaar van aardse verwarming. Daar is ook bevind dat 85.0 persent van respondente gebruik maak van energiebesparende gloeilampies. Daar kon egter geen beduidende verwantskappe gevind word tussen die algemeen-aanvaarbare groener tegnologieë en die verbruikers se bereidheid om meer te betaal vir groen elektrisiteit nie. Daar is bevind dat 61.7 persent van die respondente bereid sou wees om tot 15.4 persent as ’n premie te betaal ten einde groen elektrisiteit te koop. Daar is verder bevind dat van die drie voorgestelde aankoopmetodes, groen notas (green tags) of groen kwitansies vir voorafbetaalde elektrisiteit die mees praktiese is en waarskynlik die mees algemeen aanvaar sal word. Verbruikers verkies om elke keer wat hulle elektrisiteit koop die keuse te kan uitoefen tussen groen elektrisiteit en konvensionele krag en dan is die voorafbetaalde manier van koop die mees geskikte opsie om die aankoop van groen elektrisiteit te bestuur. ENGLISH ABSTRACT: This study comprised of a telephonic questionnaire conducted in late 2007 with 405 respondents. The aim of the questionnaire was to derive the opinions of a representative sample of Cape Town’s residential electricity consumers on matters relating to the generation, sale and use of renewable or green electricity. This was done in order to inform the formulation of appropriate green electricity products for sale into the residential electricity market. Responses were noted on Likert scales and were analysed using nonparametric statistical methodology. It was found that a high proportion (90.6 per cent) of the Capetonian consumers were concerned about the environment and a similarly highly number (86.9 per cent) are concerned about the environmental challenges that are currently faced as a result of global warming. It was found that 85.0 per cent of households in the respondent population currently make use of energy-saving light bulbs. However no significant links could be found between the use of generally-accepted greener technologies and the consumers’ willingness to pay more for green electricity. It was found that 61.7 per cent of the respondents were willing to spend an average of 15.4 per cent more as a premium in order to buy green electricity. It was further found that of the three purchasing methods suggested that green tags, or green receipts for pre-paid electricity were the most practical and the most likely to be widely accepted. Consumers preferred the option of choosing at every purchase whether they opt for green electricity or conventional power and this would be most easily managed via a pre-paid receipt system.
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Potsane, Moshe Moses. "Group invariant solutions for contaminant transport in saturated soils under radial uniform water flow background." Thesis, 2013. http://hdl.handle.net/10539/13004.
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A dissertation submitted to the Faculty of Science,
University of the Witwatersrand, in ful llment of the
requirements for the degree of Master of Science.
March 27, 2013The transport of chemicals through soils to the groundwater or precipitation at the soils surfaces leads to degradation of the resources such as soil fertility, drinking water and so on. Serious consequences may be su ered in the long run. In this dissertation, we consider macroscopic deterministic models de- scribing contaminant transport in saturated soils under uniform radial water ow backgrounds. The arising convection-dispersion equation given in terms of the stream functions is analyzed using classical Lie point symmetries. A number of exotic Lie point symmetries are admitted. Group invariant solu- tions are classi ed according to the elements of the one-dimensional optimal systems. We analyze the group invariant solutions which satisfy some physical boundary conditions. The governing equation describing movements of contaminants under ra- dial water ow background may be given in conserved form. As such, the conserved form of the governing equation may be written as a system of rst order partial di erential equation referred to as an auxiliary system, by an in- troduction of the nonlocal variable. The resulting system of equations admits a number of (local) point symmetries which induce the nonlocal symmetries for the original governing equation. We construct classes of solutions using the admitted genuine nonlocal symmetries, which include the invariant solutions obtained via corresponding point symmetries of the governing equation.
Books on the topic "Antifreeze solutions – Environmental aspects"
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McKinney, Michael L. Environmental science: Systems and solutions. Minneapolis/St. Paul: West Pub., 1996.
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M, Schoch Robert, ed. Environmental science: Systems and solutions. 3rd ed. Boston: Jones and Bartlett Publishers, 2003.
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M, Schoch Robert, ed. Environmental science: Systems and solutions. Sudbury, Mass: Jones and Bartlett Publishers, 1998.
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M, Schoch Robert, and Yonavjak Logan, eds. Environmental science: Systems and solutions. 5th ed. Boston: Jones and Barlett Publishers, 2012.
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T, Forman Richard T., ed. Road ecology: Science and solutions. Washington, DC: Island Press, 2003.
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G, Schwieger Robert, Elliott Thomas C, and International Conference on Acid Rain (2nd : 1985 : Washington, D.C.), eds. Acid rain: Engineering solutions, regulatory aspects. New York: Hemisphere Pub. Corp., 1985.
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Cable, Sherry. Environmental problems, grassroots solutions: The politics of grassroots environmental conflict. New York: St. Martin's Press, 1994.
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1956-, Feitelson Eran, and Verhoef E. T, eds. Transport and environment: In search of sustainable solutions. Cheltenham, UK: Edward Elgar, 2001.
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1965-, Lomborg Bjørn, ed. Global crises, global solutions. 2nd ed. Cambridge: Cambridge University Press, 2009.
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Kathleen, Sellers, ed. Perchlorate: Environmental problems and solutions. Boca Raton, FL: CRC/Taylor & Francis, 2007.
Find full textBook chapters on the topic "Antifreeze solutions – Environmental aspects"
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Takada, Hideshige, Misaki Koro, and Charita S. Kwan. "Marine Plastic Pollution: Chemical Aspects and Possible Solutions." In Current Topics in Environmental Health and Preventive Medicine, 83–92. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-6249-2_10.
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Panchuk, Myroslav, Sviatoslav Kryshtopa, Aleksander Sładkowski, and Andrii Panchuk. "Environmental Aspects of the Production and Use of Biofuels in Transport." In Ecology in Transport: Problems and Solutions, 115–68. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-42323-0_3.
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Savin, Yu I., E. M. Vishenkova, E. M. Pasynkova, and I. S. Khalikov. "Chemical-Analytical Control of Environmental Pollution by Warfare Agents and their Degradation Products." In Sea-Dumped Chemical Weapons: Aspects, Problems and Solutions, 109–18. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-015-8713-6_13.
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Fang, Wei-Ta, Arba’at Hassan, and Ben A. LePage. "Environmental Ethics: Modelling for Values and Choices." In Sustainable Development Goals Series, 151–74. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-4234-1_6.
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AbstractThe framework of environmental ethics is built, challenging the way we view or interpret environmental education through the eyes of different stakeholders. In this chapter we consider aspects of land and ecological ethics as well as pedagogy as they relate to environmental ethics to form modelling. We classify that environmental ethics are “anthropocentrism,” or the human-centeredapproach; “biocentrism,” or the life-centered approach; and “ecocentrism,” or the ecosystem-centered approach. Environmental paradigms are explored, which include the theories and practices regarding to environmental ethics, new environmental, ecological and behavioral paradigms, and paradigm shifts. Regarding to our choices from environmental values and concerns, we may use a model to detect our problem-solving approach to identify environmental problems we face and, find our practical needs and implement solutions toward sustainability.
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Cioffi, Antonietta, Fedele Cuculo, Lucia Di Nucci, and Gianmarco Orlando. "The economic-environmental impact analysis in the choice of the management of the dredging materials od a port basin in relation to the classification and the quality of the same: the experience of the port of Termoli (2018)." In Proceedings e report, 656–65. Florence: Firenze University Press, 2020. http://dx.doi.org/10.36253/978-88-5518-147-1.65.
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The work to be illustrated shows the comparison of the economic and environmental impact analysis in astudy case: "Dredging work on the seabed of the port of Termoli 2018". The entry into force of Ministerial Decree 173/2016 (ecotoxicological characterization of the sediments of the dredging area and of the diving area led). The new assessment required the search for solutions that summarized the economic aspects, linked to the financing available, and the adoption of a new technology that would allow a system process aimed at a better environmental protection.
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Mahmoud, Israa, and Eugenio Morello. "Co-creation Pathway for Urban Nature-Based Solutions: Testing a Shared-Governance Approach in Three Cities and Nine Action Labs." In Smart and Sustainable Planning for Cities and Regions, 259–76. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-57764-3_17.
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AbstractNature-based solutions (NBS) implementation in urban contexts has proven outcoming multiple benefits to reverse the current trend of natural resources’ degradation adversely affecting biodiversity, human health, and wellbeing. Yet, the current urban-planning policy frameworks present a rigid structure to integrate NBS definitions, and their co-benefits to get mainstreamed and up scaled on a wider urban spatial dimension. In this research, we test a complete co-creation pathway that encourages decision-makers to embed citizen engagement methodologies as an approach to co-design and co-implement NBS in shared-governance processes aiming to increment the greening of urban spaces, towards more inclusive and climate resilient cities. On one hand, we assess a tendency to involve a multiplicity of stakeholders that collaborate to the establishment of an Urban Innovation Partnership (UIP) aiming at increasing the social awareness around NBS themes, and at the same time tackling both financial and governance aspects. On the other hand, the innovation embedded in NBS paves the way to combine a multi-scalar flexibility in implementation tools and place-based urban actions, hence resulting in widespread economic, environmental, and social impacts in place. The novelty in embedding the co-creation process in urban-planning practice lies in catalyzing resources towards the transposition of research into practice through policy and planning tools for local authorities and decision-makers. Three front-runner cities (Hamburg, London, and Milan) are under investigation as part of Clever Cities—a Horizon 2020 project—aiming at implementing NBS in diverse urban-regeneration processes, through nine up-running Urban Living Labs (ULLs). Grounded on a comparative analysis of these three cities, key characterization for NBS implementation framework could be categorized into: (1) current urban-planning greening strategies in each context, (2) specific environmental and societal challenges addressed, (3) different typologies and scales of NBS integration within urban morphologies, (4) specific governance process as response to co-design and co-implementation processes, and (5) availability of financial investment and main stakeholders. As research results, we emphasize using co-creation approach in urban planning to embed and upscale NBS in an inclusive shared-governance process, hence contributing to social awareness and acceptance. Meanwhile, spatial, and financial challenges could be majorly resolved using a multi-scalar approach to manage newly embedded urban-greening policies at the urban level. Lastly, the implementation scale of NBS with local communities requires a radical paradigmatic shift in societal, individual and administrative urban-planning practices.
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Bank, Michael S., and Sophia V. Hansson. "The Microplastic Cycle: An Introduction to a Complex Issue." In Microplastic in the Environment: Pattern and Process, 1–16. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-78627-4_1.
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AbstractThe microplastic cycle was originally and formally introduced and defined as a novel concept and paradigm for understanding plastic pollution and its fluxes across ecosystem reservoirs. This concept has now been expanded to include macroplastic particles and links all aspects of the fate, transport, and effects of plastic pollution, including source-receptor models in the environment, and expanded on previously established perspectives that viewed the plastic pollution issue in a less integrated manner. The value of this paradigm is that this perspective integrates three basic scientific spheres: environmental chemistry, biology (i.e., trophic transfer), and human health. The goal of this chapter is to introduce readers to the microplastic pollution problem and to outline the microplastic cycle as a concept and holistic paradigm for addressing this ubiquitous environmental and potential public health problem. The specific objectives of this chapter were to (1) introduce this volume and its chapters by outlining the microplastic pollution issue in the context of the entire plastic cycle; (2) evaluate fluxes of microplastics across different ecosystem compartments, including the atmosphere, lithosphere, hydrosphere. and biosphere, including humans; and (3) provide insights on public policy and potential solutions to the microplastic pollution problem.
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Nnamani, C. V., D. B. Adewale, H. O. Oselebe, and C. J. Atkinson. "African Yam Bean the Choice for Climate Change Resilience: Need for Conservation and Policy." In African Handbook of Climate Change Adaptation, 453–69. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-45106-6_203.
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AbstractGlobal warming has emerged as a major challenge to development and human wellbeing in Sub-Saharan Africa in general and Nigeria in particular. Periodic incidents show that this challenge will continue and increase in impact on all aspects of natural resources – agriculture, ecosystems services, biodiversity depletion, environmental degradation and human health. Recognizing the enormous potential of underutilized plant genetic resources (PGRs) is crucial as sources of solutions to a number of these threatening challenges emanating from climate change (food and nutrition insecurity, genetic erosion, loss of agro-biodiversity, green job growth and income generation) cannot be over-emphasized. Sphenostylis stenocarpa (Hochst. ex. A. Rich) Harms., commonly known as African yam bean (AYB) belonging to the leguminous Fabaceae, is an underutilized PGR with rich portfolio which could serve as vital source of robust adaption and resilient germplasm for vulnerable local communities in Nigeria. Its substantial nutritional, environmental, cultural, social, medicinal, industrial and soil restorative potentials underpins its position as climate – smart species. Enhancing the potentials of African yam bean via robust innovative approaches for wider utilization through accelerated research, farmer seed exchanges, in-situ and ex-situ conservations, farmers selection, and policy programs such as seed sovereignty will accentuate its adaptation and used as resilient climate –smart species for the vulnerable groups in Nigeria to cushion impact of climate change.
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Head, Brian W. "Complexity, Crises and Coping Strategies." In Wicked Problems in Public Policy, 61–82. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-94580-0_4.
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AbstractWicked problems are shaped through complex system dynamics and involve multiple stakeholders. Public concern about wicked problems is often generated through crises that provoke awareness and intensify a wide sense of urgency. This chapter outlines some key aspects of crises that affect how wicked problems are perceived, debated and managed. Importantly, some ‘creeping’ crises develop gradually over an extended period with slow cumulative impacts, and there is uncertainty about when to accord them high priority. Other crises are immediate and fast-moving, giving rise to general acceptance of the need for rapid responses. In many cases, there will be serious disagreements about policy responses, owing to the complexity of causal factors and the diversity of stakeholder values and opinions. Some crisis-induced challenges can be well managed in the short term, leading to a return towards ‘normal’ life, but most responses do not explicitly tackle the complex underlying causes that generate the crises. Finally, it is suggested that the governance of wicked problems is less about designing elegant science-based solutions and more about implementing ‘coping’ strategies, which manage uncertainties, strengthen community capabilities and build resilience across all sectors—social, economic and environmental.
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Mantero, Claudio. "Sustainable, Smart and Safe Mobility at the Core of Sustainable Tourism in Six European Islands." In Sustainable Mobility for Island Destinations, 1–18. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-73715-3_1.
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AbstractTransport and tourism are rising economic sectors based on their mutual growth on reliable technological tools, affordable energy sources in relatively peaceful decades. This growing trend, faced along years of sudden slowdown caused mainly by the financial and health crisis; one of the most severe and recent episodes was the COVID-19 pandemic. The pandemic outbreak is representing a global turning point for both international markets of tourism and transport which can be addressed with innovative solutions looking to retake the growing trends. In such a changing framework CIVITAS DESTINATIONS European project addressed the main challenges of tourism and resident mobility at local (rural, urban area, large city) and regional levels, focusing on six European islands (Malta, Cyprus, Elba, Crete, Gran Canaria, Madeira) aiming to implement and evaluate 83 different sustainable mobility measures. The project proves to have a cumulative relevant impact on environmental indicators such as CO2 emission avoided, fossil fuel saved and energy saved. Additionally, the project findings focus on the quality of life and economic development to grant long-run environmental and financial sustainability of tourism and transport at the local and regional levels. The main aspects observed were related to public participation and governance models in touristic mobility integrated with the residents’ needs, touristic mobility the island, role of technologies to focus on final user needs, growing trends of elder and disabled people, new integrated and innovative business in tourism and mobility markets, health at the core of future trends.
Conference papers on the topic "Antifreeze solutions – Environmental aspects"
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Pylypchuk, O. D., O. V. Krivenkо, and A. P. Polubok. "Influence of environmental aspects of design on the aesthetics of architectural space." In SCIENCE, ENGINEERING AND TECHNOLOGY: GLOBAL TRENDS, PROBLEMS AND SOLUTIONS. Baltija Publishing, 2020. http://dx.doi.org/10.30525/978-9934-588-79-2-2.29.
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Krupowicz, Wioleta, and Katarzyna Sobolewska-Mikulska. "Possible Applications of Spatial Analyses in Designing the Agricultural Road Network with Particular Consideration of the Environmental and Landscape Aspects." In Environmental Engineering. VGTU Technika, 2017. http://dx.doi.org/10.3846/enviro.2017.208.
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The development of the agricultural road network is a complex activity based on a broad range of criteria necessary to be taken into account during analyses and desk studies. The analyses and design solutions cannot be unilateral, considering only technical and economic aspects. Elements of environmental protection and management of agricultural landscape, as well as solutions in the scope of protection of soils and waters are necessary in this type of design works, and result from solutions accepted for implementation in reference to the rural areas of all Member States of the European Union. Such a multi-aspect process requires the use of tools in an environment which technologically permits the development of multi-variant solutions to a given problem, and selection of a single, most appropriate proposal. Geographic Information Systems (GIS) currently constitute such an environment. Their undeniable advantages include their analytical possibilities which can be formalised in the form of developed models of spatial analyses – creating sets of new, ready to use tools supporting the decision making process in the scope of determination of the optimal course of agricultural roads. Additional advantages are the possibility of integration of data obtained from various sources, and presentation to stakeholders (e.g. residents, farmers, local authorities, entrepreneurs, and investors) of the obtained solutions in the form of maps, almost in real time, as well as possibility of making optimum decisions with their active participation. Easier access to GIS technology and systematically growing level of awareness regarding measurable benefits from the application of this type of solutions should also be emphasised. The article presents examples of spatial analyses allowing for relatively fast obtaining of spatial information necessary for efficient design-related decision making for the purpose of improvement of the system of agricultural roads with particular consideration of environmental and landscape aspects.
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Sobolewska-Mikulska, Katarzyna, and Małgorzata Stanczuk-Gałwiaczek. "Rural Landscape Shaping Through the Introduction of Trees in Land Consolidation Projects in Poland." In Environmental Engineering. VGTU Technika, 2017. http://dx.doi.org/10.3846/enviro.2017.050.
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Land consolidation works carried out in Poland are mainly aimed at the improvement of spatial structure of plots in agricultural holdings. However, modern trends indicate the necessity of compliance with sustainable rural development policy. This implicates the inevitability of inclusion of the environmental, landscape, technical and organizational aspects in the land consolidation projects in Poland. One such operation is the introduction of trees and shrubs. The paper aims to investigate the scope of land consolidation design solutions concerning the introduction of trees and shrubs. The study was based on selected land consolidation projects from different regions of Poland. The paper also proposes the concept of implementation of the design solutions related to the introduction of trees and shrubs in the land consolidation projects.
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Brown, Steven H. "Radiological Aspects of In Situ Uranium Recovery." In The 11th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2007. http://dx.doi.org/10.1115/icem2007-7379.
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In the last few years, there has been a significant increase in the demand for Uranium as historical inventories have been consumed and new reactor orders are being placed. Numerous mineralized properties around the world are being evaluated for Uranium recovery and new mining / milling projects are being evaluated and developed. Ore bodies which are considered uneconomical to mine by conventional methods such as tunneling or open pits, can be candidates for non-conventional recovery techniques, involving considerably less capital expenditure. Technologies such as Uranium in situ leaching in situ recovery (ISL / ISR), have enabled commercial scale mining and milling of relatively small ore pockets of lower grade, and may make a significant contribution to overall world wide uranium supplies over the next ten years. Commercial size solution mining production facilities have operated in the US since 1975. Solution mining involves the pumping of groundwater, fortified with oxidizing and complexing agents into an ore body, solubilizing the uranium in situ, and then pumping the solutions to the surface where they are fed to a processing plant. Processing involves ion exchange and may also include precipitation, drying or calcining and packaging operations depending on facility specifics. This paper presents an overview of the ISR process and the health physics monitoring programs developed at a number of commercial scale ISL / ISR Uranium recovery and production facillities as a result of the radiological character of these processes. Although many radiological aspects of the process are similar to that of conventional mills, conventional-type tailings as such are not generated. However, liquid and solid by product materials may be generated and impounded. The quantity and radiological character of these by products are related to facility specifics. Some special monitoring considerations are presented which are required due to the manner in which Radon gas is evolved in the process and the unique aspects of controlling solution flow patterns underground. An overview of the major aspects of the health physics and radiation protection programs that were developed at these facilities are discussed and contrasted to circumstances of the current generation and state of the art of Uranium ISR technologies and facilities.
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Zeleňáková, Martina, Gabriela Hudáková, Ladislav Tometz, and Helena Hlavatá. "Investigation of Rainwater Infiltration with Emphasis on Hydro-geological as well as Hydrological Conditions." In Environmental Engineering. VGTU Technika, 2017. http://dx.doi.org/10.3846/enviro.2017.095.
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Urban drainage has become one of the most important aspects of urban development. Ensuring long-term functioning of sewer systems and waste-water treatment plants is associated with constantly rising costs, and it is clear nowadays that the contemporary method of urban drainage cannot possibly be implemented worldwide because of the financial burden. The existing method of urban drainage continues to threaten the status of water flow and water sources. Urban hydrology has evolved to improve the way urban run-off is managed for flood protection, public health and environmental protection. The essence of the future solution resides in finding an acceptable compromise or an alternative solution for rainwater drainage from urban areas. The content of this paper is research focused on the infiltration of water from surface run-off and comparison of ground testing, laboratory analysis and numerical analysis of filtration coefficient. The foundation for improving the effectiveness of urban drainage will be created through the proposal and comparison of infiltration conditions. The topic of the paper emerged because of insufficient information about infiltration systems in the Slovak technical regulations and the lack of support for water infiltration from surface run-off. This paper points out the fundamentals, principles and development of proposals for infiltration facilities. The aim of the paper was to expand the body of scientific knowledge in research and solutions for infiltration of water from surface run-off with emphasis on the infiltration capacity of the selected area and intensity of precipitation.
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Tamošaitienė, Jolanta, and Tomas Starta. "New model for the selection of effective wall solutions for residential buildings." In The 13th international scientific conference “Modern Building Materials, Structures and Techniques”. Vilnius Gediminas Technical University, 2019. http://dx.doi.org/10.3846/mbmst.2019.106.
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Currently, the construction sector is facing requirements for higher quality and efficiency standards as well as objectives related to value creation. In construction, rational decision-making problems often involve creating a unique complex of criteria, which must consider multiple requirements and conditions. The paper presents the developed model for the selection of multi-layered external walls of a residential building. The model considers the following aspects and parameters: time, cost, quality, environmental conditions, aspects of sustainable development, and problemsolving benefits received from the assessment of alternatives and the development of the model. Game theory was used to calculate the defining rational decision. For the calculations was used game theory: Bayes, Wald’s rule, Savage criterion, Laplace’s rule. This study presents the developed model for the selection of multi-layered external walls of a residential building and calculation results based on game-theory rules, which are effective tools for rational decisionmaking.
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Jørgensen, Michael Søgaard. "A Model for Organizing and Analyzing Integration of Environmental Concerns in Product Design and Re-Design." In ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/esda2014-20211.
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Based on examples from research and innovation within nanotechnology, housing, bioenergy, and clothing the complexity of environmental innovation is discussed. A model for a more holistic approach to environmental innovation, which can be used both as part of innovation processes and for analyses of previous innovation processes, is developed. The approach is based on: 1) A scenario perspective on environmental aspects and impacts which implies a focus on the future roles of a product, its users and the surrounding society as imagined by the designers in their considerations about the problems addressed by the product and the solution it is offering. 2) A system’s perspective which implies a focus on the system, which a product is part of, including the need for supporting infrastructures like stakeholder training, waste management etc. 3) A lifecycle perspective to environmental aspects and impacts in order not only to capture environmental aspects from cradle to grave, e.g. related to material extraction and refining, chemical exposure during manufacturing, use and waste handling. 4) A governance perspective on management of environmental aspects and impacts, both in relation to the legitimacy of the environmental problems addressed and the solutions ‘offered’ by the product.
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Fleischer, Friedrich. "Aspects of Gas Turbine Noise Control in the Vicinity of Residential Areas." In ASME 1987 International Gas Turbine Conference and Exhibition. American Society of Mechanical Engineers, 1987. http://dx.doi.org/10.1115/87-gt-5.
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This paper deals with problems of noise control involving gas turbine plants, particularly where they are installed near residential areas already subject to noise nuisance. Noise control measures for existing industrial or power-generating plant are often designed to achieve an overall immitted noise level only marginally below the legal maximum. Considerably enhanced measures are thus required for additional plant. However, the noise from a gas turbine plant has numerous individual sources and it is shown that a differentiated approach is required. Generally, progressive reductions in noise levels involve disproportionately greater increases in expenditure on appropriate measures. Stringent environmental protection requirements necessitate cost-intensive solutions.
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Navarro, Mariano, Fernando Go´mez, and Emilio Garci´a. "Lessons Learned From the Operation of a LILW National Disposal Centre: The Cabril and the Spanish Case." In ASME 2009 12th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2009. http://dx.doi.org/10.1115/icem2009-16029.
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Spain occupies a relatively important position in experience in the field of LILW management. The management of LILW in Spain may be defined as an integrated system encompassing the entire spectrum; from production controls, removal and transport, to disposal. In this system, a clear definition of the responsibilities of each of the people involved plays a fundamental role. ENRESA, the organization in charge of radioactive waste management in Spain, has been operating the El Cabril LILW disposal facility since 1992, this installation being a key component in the national LILW management programme. Over the years ENRESA has acquired significant operating experience from a multi-disciplinary point of view, including technical, economic and social aspects. To date, since the design phase of the facility and over more than fifteen years, ENRESA has adopted a series of decisions and has undertaken programmes and activities that have allowed the installation to evolve into the reality that it now is. The aim of this paper is to present the lessons learned from a strategic point of view and in relation to the most relevant and significant aspects that have facilitated the normal operation of the facility, and the development of specific solutions to the challenges posed by the performance of activities, and the emerging needs of the Spanish programme.
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Booth, Peter, and Vicky Gaskin. "Can Sustainability Be Applied to Our Remediation Challenges?" In ASME 2011 14th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2011. http://dx.doi.org/10.1115/icem2011-59148.
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There are many environmental remediation challenges around the world today with a radiological connotation. These in turn relate to all aspects of the nuclear industry life cycle as well as the NORM industries and consequences of accidents/incidents. In reality, apart from one or two major exceptions in a few counties who have extensive budgets allocated to environmental remediation, we do not generally see a lot of real progress in the protection of human health and the environment from legacy issues. It is important therefore to determine why this is the case and if there is anything that can be undertaken to improve the situation. There are a number of reasons potentially leading to this lack of progress, namely: • A lack of available funding; • The diversion of funds to other issues deemed to be a greater priority; • No practical experience in resolving such problems; • Lack of established regulatory and/or procedural infrastructure. More often than not when environmental remediation challenges exist, the decision makers only tend to look for final solutions. If such final solutions can’t be achieved, often because of funding restrictions, then little or no progress is generally made. However, there is the potential through the phasing of environmental remediation work to find some early winners and to start to reduce the risk and detriment to human health and the environment, even if the improvement seen is in the short term initially. When further funding becomes available or technology improves then the longer term solutions could be implemented. It is important to ensure that any interim solutions are implemented in a manner such that further options or final solutions are not jeopardised. In reality therefore it should be possible to introduce greater sustainability into how we approach environmental remediation, rather than admit defeat at the outset. There are many different definitions for the term sustainability but a useful one can be referenced from the US Sustainable Remediation Forum (SURF): • “Sustainable remediation is broadly defined as a remedy or combination of remedies whose net benefit on human health and the environment is maximised through the judicious use of limited resources.” Industry in general and the nuclear related industries in particular gain very little support and engender distrust so demonstrating some progress in environmental remediation can only be beneficial. We cannot keep leaving legacy issues to get worse. The whole sustainability argument is therefore inextricably linked into the decision making process and additionally often the success of stakeholder engagement. Importantly, on the other hand progress should not be achieved merely for the sake of it, there needs to be a demonstration of overall net benefit. This paper will aim to demonstrate how the application of sustainable decisions and approaches can facilitate improved environmental remediation in those regions where in general the legacy issues remain unsolved. Such sustainable solutions can help deliver both short and long term net benefit to any particular environmental remediation problem.
Reports on the topic "Antifreeze solutions – Environmental aspects"
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Barquet, Karina, Elin Leander, Jonathan Green, Heidi Tuhkanen, Vincent Omondi Odongo, Michael Boyland, Elizabeth Katja Fiertz, Maria Escobar, Mónica Trujillo, and Philip Osano. Spotlight on social equity, finance and scale: Promises and pitfalls of nature-based solutions. Stockholm Environment Institute, June 2021. http://dx.doi.org/10.51414/sei2021.011.
Full textAbstract:
Human activity has modified and deteriorated natural ecosystems in ways that reduce resilience and exacerbate environmental and climate problems. Physical measures to protect, manage and restore these ecosystems that also address societal challenges in sustainable ways and bring biodiversity benefits are sometimes referred to as “nature-based solutions” (NBS). For example, reducing deforestation and restoring forests is a major opportunity for climate mitigation, while protecting or restoring coastal habitats can mitigate damage to coastal areas from natural hazard events, in addition to potentially providing co-benefits related to livelihood, recreation, and biodiversity. There is now an impetus to shift towards greater deployment of nature-based solutions. Not only do they offer an alternative to conventional fossil fuel-based or hard infrastructure solutions but, if implemented correctly, they also hold great promise for achieving multiple goals, benefits and synergies. These include climate mitigation and resilience; nature and biodiversity protection; and economic and social gains. 2020 saw an explosion in publications about NBS, which have contributed to filling many of the knowledge gaps that existed around their effectiveness and factors for their success. These publications have also highlighted the knowledge gaps that remain and have revealed a lack of critical reflection on the social and economic sustainability aspects of NBS. Building on these gaps, we decided to launch this mini-series of four briefs to provoke a more nuanced discussion that highlights not only the potential benefits, but also the potential risks and trade-offs of NBS. The purpose is not to downplay the importance of NBS for biodiversity, ecosystems, and coastal mitigation and adaptation, but to ensure that we establish a dialogue about ways to overcome these challenges while leaving no one behind.
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Narvaez, Liliana, and Caitlyn Eberle. Technical Report: Southern Madagascar food insecurity. United Nations University - Institute for Environment and Human Security (UNU-EHS), August 2022. http://dx.doi.org/10.53324/jvwr3574.
Full textAbstract:
Southern Madagascar’s worst drought in 40 years had devastating cumulative effects on harvest and livelihoods. On top of this, frequent sandstorms and pest infestations have led to severe stress on vegetation triggering a drastic decline in rice, maize and cassava production. These environmental aspects, combined with a lack of livelihood diversification and ongoing poverty, the presence of cattle raiders and restrictive government decisions, have driven the population of southern Madagascar to acute food insecurity conditions. By December 2021, more than 1.6 million people were estimated to have been suffering high levels of food insecurity. This case is an example of how multiple, complex environmental and social factors can combine to trigger a profound crisis in a territory, where vulnerable groups, such as children under five, tend to be particularly affected. Environmental degradation, together with socioeconomic and political dynamics are leaving vulnerable people even more exposed to food crises with few livelihood options or safety nets to cope with disasters. This technical background report for the 2021/2022 edition of the Interconnected Disaster Risks report analyses the root causes, drivers, impacts and potential solutions for the Southern Madagascar food insecurity through a forensic analysis of academic literature, media articles and expert interviews.