Dissertations / Theses on the topic 'Fuel – Environmental aspects'
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Bose, Arun Chand. "Pulverized coal combustion: Fuel nitrogen mechanisms in the rich post-flame." Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184635.
Full textYates, Christopher Lee. "The study of anode materials for an intermediate temperature solid oxide fuel cell utilizing hydrogen sulfide as the fuel." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/10054.
Full textIp, Mei-fong Phyllis, and 葉美芳. "Environmental management options for pulverised fuel ash (PFA)." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1994. http://hub.hku.hk/bib/B31252849.
Full text顧振彪 and Chun-piu Benedict Koo. "Study on a biodiesel fuel produced from restaurant waste animal fats." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B31224519.
Full textChow, Kwok-on Desmond, and 周國安. "The environmental improvement due to the relocation of base load gas production plant from Ma Tau Kok to Tai Po industrial estate." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1994. http://hub.hku.hk/bib/B4257433X.
Full textJebe, Thulisa. "Potential socio-economic implications of ethanol production as a green economic initiative in Cradock, Eastern Cape." Thesis, Cape Peninsula University of Technology, 2018. http://hdl.handle.net/20.500.11838/2776.
Full textSouth Africa is taking a continental lead towards the transition of the green economy, and the energy sector has been identified as one of the cornerstones integral in this transition. This transition pays attention to alternative energy sources to gradually replace fossil fuels. Recently, the production of ethanol is seen as an energy source that is an integral player in achieving a green economy. The ethanol production project is linked to the improvement of the economy, and social well-being concomitant with the enhancement of the environmental quality tenets embodied by the green economy. Scholars have noted that these projects tend to ignore socio-economic realities of under privileged people especially in rural areas and small towns. While the green energy is often presented by the state there is, however, no evidence of the positive as well as negative impacts of ethanol projects on improving the livelihoods of the local communities or contributing to the substance of the local economies while protecting the quality of the environment. This thesis explored the subject of ethanol projects as green economic models in the context of the ethanol project in Cradock. The thesis investigated the socio-economic implications of the ethanol project in Cradock as a green economic model. The research study argues that the inclusion of the local people in decision making for the ethanol project is crucial to securing their benefits from the project. This means that local people should be involved early in the decision making process. Failure to engage the local residents in the initial stages of decision making, may create a lack of sense of ownership resulting in a lack of socio-economic benefits for the residents. The research study adopted a qualitative research design and an inductive approach. The ethanol project in Cradock was used as a case study for the research, and two sampling techniques, purposive sampling and random sampling were used. Interviews, questionnaires and observations were used to collect data from the residents of Cradock, the business sector (hospitality, tourism and agricultural retail), the emerging farmers, the farm workers, the Agrarian Research Development Agency, and Government Departments (Local Economic Development, Department of Agriculture, Department of Rural Development and Land Reform). The findings illustrate that the ethanol project in Cradock is not consistent with the tenets of a green economic model. The results suggested that the project does not improve the livelihood of the community or contribute to the sustenance of the local economies while protecting the quality of the environment. From an environmental perspective, while the ethanol project regarding providing ethanol fuel contributes positively to the global green agenda, it deteriorates the quality of the local environment. The project pollutes the local environment which is a source of livelihood for the local people and the economy. Therefore, the adverse effect of the project on the local environment contributes to a negative effect on the local economy and livelihood of the residents. The results also revealed that the project stakeholders, particularly the residents of Cradock and the emerging farmers, were not involved in the early stages of the project where the benefits were determined. As a result, the stakeholders do not have a sense of ownership of the project, and there are uncertainties about the sustainability of their socio-economic benefits. The ethanol project introduces a shift from the traditional commercial agriculture to the production of biofuel feedstock. This causes an effect on the local economy and livelihood because traditional commercial agriculture has sustained the town for more than 200 years. The thesis raises questions about the notion that ethanol projects are green economic models.
Haynes, Comas Lamar. "Simulation of tubular solid oxide fuel cell behavior for integration into gas turbine cycles." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/21797.
Full textRunyon, Thomas Alvin 1963. "Microcosm experiments to enhance the bioremediation of a No.2 fuel oil-contaminated soil." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277064.
Full textDelaforce, Philip M. "Feasibility study of conventional metals as current collectors in solid oxide fuel cells : technical performance, environmental aspects and economic factors." Thesis, University of Surrey, 2006. http://epubs.surrey.ac.uk/842758/.
Full textAdefeso, Ismail Babatunde. "Techno-economic analysis of a gasification system using refuse-derived fuel from municipal solid waste." Thesis, Cape Peninsula University of Technology, 2017. http://hdl.handle.net/20.500.11838/2753.
Full textThe search for alternatives to fossil fuel is necessary with a view to reducing the negative environmental impact of fossil fuel and most importantly, to exploit an affordable and secured fuel source. This study investigated the viability of municipal solid waste gasification for a fuel cell system. Potential solid fuels obtained from the study in the form of refuse-derived fuel (RDF) had high heating value (HHV) between 18.17 MJ/Kg - 28.91 MJ/Kg with energy density increased from 4142.07 MJ/m3 to 10735.80 MJ/m3. The molecular formulas of RDF derived from Ladies Smith drop-off site, Woodstock drop-off site and an average molecular formula of all thirteen municipal solid waste (MSW) disposal facilities were CH1.43O1.02, CH1.49O1.19, and CH1.50O0.86 respectively. The comparative ratios of C/H were in the range of 7.11 to 8.90. The Thermo Gravimetric Analysis showed that the dehydration, thermal decompositions, char combustions were involved in the production of gaseous products but flaming pyrolysis stage was when most tar was converted to syngas mixture. The simulation of RDF gasification allowed a prediction of the RDF gasification behaviour under various operating parameters in an air-blown downdraft gasifier. Optimum SFR (steam flowrate) values for RDF1, RDF2 and RDF3 were determined to be within these values 2.80, 2.50 and 3.50 and Optimum ER values for RDF1, RDF2 and RDF3 were also determined to be within these values 0.15, 0.04 and 0.08. These conditions produced the desired high molar ratio of H2/CO yield in the syngas mixture in the product stream. The molar ratios of H2/CO yield in the syngas mixture in the product stream for all the RDFs were between 18.81 and 20.16. The values of H2/CO satisfy the requirement for fuel cell application. The highest concentration of heavy metal was observed for Al, Fe, Zn and Cr, namely 16627.77 mg/Kg at Coastal Park (CP), 17232.37 mg/Kg at Killarney (KL), 235.01 mg/Kg at Tygerdal (TG), and 564.87 mg/Kg at Kraaifontein (KF) respectively. The results of quantitative economic evaluation measurements were a net return (NR) of $0.20 million, a rate of return on investment (ROI) of 27.88 %, payback time (PBP) of 2.30 years, a net present value (NPV) of $1.11 million and a discounted cash flow rate of return (DCFROR) of 24.80 % and 28.20 % respectively. The results of the economic evaluations revealed that some findings of the economic benefits of this system would be viable if costs of handling MSW were further quantified into the costs analysis. The viability of the costs could depend on government responsibility to accept costs of handling MSW.
Moore, Paul 1962. "The Analysis of PCDD and PCDF Emissions from the Cofiring of Densified Refuse Derived Fuel and Coal." Thesis, University of North Texas, 1990. https://digital.library.unt.edu/ark:/67531/metadc330690/.
Full textWeiland, Daniel Albert. "Rooftop pv impacts on fossil fuel electricity generation and co2 emissions in the pacific northwest." Thesis, Portland State University, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1547603.
Full textThis thesis estimates the impacts of rooftop photovoltaic (PV) capacity on electricity generation and CO2 emissions in America's Pacific Northwest. The region's demand for electricity is increasing at the same time that it is attempting to reduce its greenhouse gas emissions. The electricity generated by rooftop PV capacity is expected to displace electricity from fossil fueled electricity generators and reduce CO2 emissions, but when and how much? And how can this region maximize and focus the impacts of additional rooftop PV capacity on CO2 emissions? To answer these questions, an hourly urban rooftop PV generation profile for 2009 was created from estimates of regional rooftop PV capacity and solar resource data. That profile was compared with the region's hourly fossil fuel generation profile for 2009 to determine how much urban rooftop PV generation reduced annual fossil fuel electricity generation and CO2 emissions. Those reductions were then projected for a range of additional multiples of rooftop PV capacity. The conclusions indicate that additional rooftop PV capacity in the region primarily displaces electricity from natural gas generators, and shows that the timing of rooftop PV generation corresponds with the use of fossil fuel generators. Each additional Wp/ capita of rooftop PV capacity reduces CO2 emissions by 9,600 to 7,300 tons/ year. The final discussion proposes some methods to maximize and focus rooftop PV impacts on CO2 emissions, and also suggests some questions for further research.
Leung, Pui-yin, and 梁佩賢. "A study of the application of alternative fuels in public light buses in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B44569890.
Full textChoi, Ya-yin, and 蔡雅然. "A review of the control of motor vehicle fuel specifications and its effects on air quality." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B31255450.
Full textZullo, Johnathon. "A model and optimization of alternative fuel vehicle fleet composition with triple bottom line concerns." Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/44870.
Full textNg, Tze-on, and 吳子安. "A study of sustainable fuel in public transport: the case of public light buses in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B31945557.
Full textJahani, Aghamolla. "Comparative Toxicity of Refuse-Derived Fuel Fly Ash on Two Species of Earthworms, Lumbricus terrestris and E. foetida, Using an Artificial Soil Exposure Protocol." Thesis, University of North Texas, 1991. https://digital.library.unt.edu/ark:/67531/metadc504583/.
Full textMattos, Luis Antonio Terribile de. "Proposta metodológica para a identificação e avaliação de aspectos e impactos ambientais em instalações nucleares do IPEN: estudo de caso aplicado ao Centro do Combustível Nuclear." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/85/85131/tde-14012014-143650/.
Full textThis work presents an application of Failure Mode Effect Analysis (FMEA) to the process of identification of environmental aspects and impacts as a part of implementation and maintenance of an Environmental Management System (EMS) in accordance with the NBR ISO 14001 standard. Also, it can contribute, as a complement, to the evaluation and improvement of safety of the installation focused. The study was applied to the Nuclear Fuel Center (CCN) of Nuclear and Energy Research Institute (IPEN), situated at the Campus of University of Sao Paulo, Brazil. The CCN facility has the objective of promoting scientific research and of producing nuclear fuel elements for the IEA-R1 Research Reactor. To identify the environmental aspects of the facility activities, products, and services, a systematic data collection was carried out by means of personal interviews, documents, reports and operation data records consulting. Furthermore, the processes and their interactions, failure modes, besides their causes and effects to the environment, were identified. As a result of a careful evaluation of these causes it was possible to identify and to classify the major potential environmental impacts, in order to set up and put in practice an Environmental Management System for the installation under study. The results have demonstrated the validity of the FMEA application to nuclear facility processes, identifying environmental aspects and impacts, whose controls are critical to achieve compliance with the environmental requirements of the Integrated Management System of IPEN. It was demonstrated that the methodology used in this work is a powerful management tool for resolving issues related to the conformity with applicable regulatory and legal requirements of the Brazilian Nuclear Energy Commission (CNEN) and the Brazilian Institute of Environment (IBAMA).
Ndamase, Zola. "The implication of fuel-wood use and governance to the local environment: a case study of Ward Seven of Port St Johns Municipality in the Eastern Cape." Thesis, University of Fort Hare, 2012. http://hdl.handle.net/10353/448.
Full textFung, Kin-lin, and 馮建蓮. "A review of the effectiveness of the Government LPG Taxi Scheme as a fuel switch program for cleaner air: itsimplication for public acceptance and for future policies." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B31254196.
Full textPoslusny, Matthew. "Analysis of PAH and PCB Emissions from the Combustion of dRDF and the Nondestructive Analysis of Stamp Adhesives." Thesis, University of North Texas, 1989. https://digital.library.unt.edu/ark:/67531/metadc331998/.
Full textSørum, Lars. "Environmental aspects of municipal solid waste combustion." Doctoral thesis, Norwegian University of Science and Technology, Norwegian University of Science and Technology, 2000. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1488.
Full textMATTOS, LUIS A. T. de. "Proposta metodológica para a identificação e avaliação de aspectos e impactos ambientais em instalações nucleares do IPEN: estudo de caso aplicado ao Centro do Combustível Nuclear." reponame:Repositório Institucional do IPEN, 2013. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10595.
Full textMade available in DSpace on 2014-10-09T14:00:09Z (GMT). No. of bitstreams: 0
Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
Yu, Chuan, and 余川. "Life cycle analysis of different feedstocks of biodiesel production." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B49618027.
Full textpublished_or_final_version
Mechanical Engineering
Master
Master of Philosophy
Walecka-Hutchison, Claudia. "Nitrogen dynamics in diesel biodegradation : effects of water potential, soil C:N ratios, and nitrogen cycling on biodegradation efficacy." Diss., The University of Arizona, 2005. http://hdl.handle.net/10150/191274.
Full textMay, John R. (John Robert) 1978. "Sustainability of electricity generation using Australian fossil fuels." Monash University, Dept. of Chemical Engineering, 2003. http://arrow.monash.edu.au/hdl/1959.1/9537.
Full textThellier, Lionel. "Environmental impacts of the electricity produced by a solid oxide fuel cell and nuclear reactors." Thesis, Lille 1, 2008. http://www.theses.fr/2008LIL10107.
Full textHumankind faces many challenges in the energy field: explosion in demand, greenhouse gas emissions, rarefaction of certain fossi! resources, pollution etc. The answer to these challenges lies in particular in the development of energy conversion systems with a high efficiency and low environmental impacts. Furthermore, it requires the development of approaches which enable to evaluate these impacts and communicate the results to a very wide audience. The work undertaken in this Phd thesis is a contribution to the efforts underway to me et this dual demand. It is made up of two parts which have consisted respectively: - in evaluating with a mature approach the environmental impacts of the electricity produced by an energy conversion system currently under development. The objective was to carry out a Life Cycle Analysis (LCA) of the electricity provided by a Solid Oxide Fuel Cell (SOFC) "stack". The study was aimed to define the optimal manufacturing, use and end-of-life conditions for this stack from an environmental point of view, in order to help the designers and users in their technological choices. - in developing an approach which allows the assessment of the environmental impacts of the electricity produced by a mature energy conversion system. The objective was to adapt the concepts of Ecological Footprint and Biocapacity in order that they properly integrate nuclear electricity production. The study was aimed to propose a simple indicator for evaluating the environmental impacts ofthis type of electricity
Nordin, Anders. "On the chemistry of combustion and gasification of biomass fuels, peat and waste : environmental aspects." Doctoral thesis, Umeå universitet, Kemiska institutionen, 1993. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-110672.
Full textMyburgh, Dirk Petrus. "The treatment of biodiesel wastewater using an integrated electrochemical and adsorption process." Thesis, Cape Peninsula University of Technology, 2018. http://hdl.handle.net/20.500.11838/2693.
Full textThe production of biodiesel is an energy and water intensive process. The wastewater that is produced during this process is high in concentrations of COD, BOD, FOG and various other contaminants. Since it contains low levels of nutrients, it is difficult to degrade using natural processes such as conventional activated sludge wastewater treatment. The discharge of untreated biodiesel wastewater also raises serious environmental concern. It interferes when remediated with biological processes and results in additional costs during the production of biodiesel when penalties and fines are applied. Conventional treatment processes are not capable of treating contaminants and pollutants in biodiesel to satisfactory concentrations and hence advanced treatment processes are necessary. In this research, a lab scale integrated treatment process was used to investigate the successful reduction of contaminants, in particular COD, BOD and FOG. The integrated treatment process used in this study consisted of three consecutive steps; acidification, electrochemical oxidation and adsorption using chitosan as an adsorbent. The electrochemical oxidation process with IrO2-Ta2O5/Ti anodes was applied to treat biodiesel wastewater. Different operating conditions were tested to establish favourable conditions. The current density applied as well as the concentration of NaCl as the supporting electrolyte greatly affected the process. A NaCl concentration of 0.08M was deemed sufficient, whereas a current density of 1 mA/cm² showed superior performance compared to lower or higher current densities. Adsorption of pollutants in biodiesel wastewater was investigated using Chitosan as the adsorbent. Various chitosan concentrations, initial pH of the wastewater and repetitive adsorption stages were investigated. It was discovered that all three operating conditions greatly affect the performance of the process. The three consecutive adsorption stages using a chitosan concentration of 4.5 g/L at a pH of 2 resulted in the highest pollutant removal. It was observed that the integrated treatment process could reduce COD, BOD and FOG levels by 94%, 86% and 95% respectively. This concludes that the treated effluent complies with local industrial effluent discharge standards, which could be disposed safely without further treatment.
Yuan, Tao 1968. "Dechlorination of environmentally recalcitrant chlorinated aromatic compounds." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=79208.
Full textPentachlorophenol (PCP), octachloronaphthalene and decachlorobiphenyl are all highly chlorinated aromatic compounds, of which, PCP has been used mainly as a biocide. Octachloronaphthalene and decachlorobiphenyl don't have practical use, but their congeners have been used widely as chemicals in industry. These compounds are toxic, recalcitrant and bio-accumulated within organisms. As the conventional treatment, incineration of these compounds can cause more serious problems, so that suitable alternatives need to be developed for their detoxification.
When compared with biodegradation or the thermal treatment of these compounds, chemical degradations have several merits. (Abstract shortened by UMI.)
Hengnirun, Somgiat. "A computer simulation model for manurial nitrogen management : environmental aspects (MANIMEA)." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=40357.
Full textThe model was developed to be interactive and user-friendly and was constructed on a modular basis using Microsoft FORTRAN PowerStation$ sp circler$ as a compiler. It can be run on an IBM$ sp circler$ or IBM compatible microcomputer with a minimum requirement of a 386 microprocessor with 4 MB RAM. This model was developed as a nitrogen management-oriented model. However, it can also be used to gain further understanding of nitrogen processes for research and teaching purposes.
The accuracy of the stimulation was enhanced by taking into account moisture and temperature variation and distribution in the soil. The SWACROP and the HEAT programs were integrated into the MANIMEA model to generate transient moisture and temperature profiles, respectively. The Numerical Method Of Lines (NMOL) technique, which implements finite difference method, was used to numerically solve the partial differential equations in the model.
Generally, the results generated by the MANIMEA model using the parameters from literature agreed with the results obtained by analytical solutions and from experiments. It was found that the model is highly sensitive to the volatilization and net mineralization rate constants $(K sb{v}$ and $K sb{m}).$ The study showed that the MANIMEA model can be implemented to evaluate nitrogen transformations, transport, and plant uptake for a wide range of climatic and soil conditions and organic type of wastes. Such a tool can contribute to the protection of our environment through a better management of organic nitrogen fertilizer and a better understanding of the nitrogen processes.
Anestis, Ioannis D. "Preference avoidance reactions of rainbow trout (Salmo gairdneri) following long term sublethal exposure to chromium and copper." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75767.
Full textPre-exposed fish exhibited decreasing avoidance reactions compared to non-exposed populations. Increased tolerance to the toxicant, was suggested by the increase in avoidance threshold values with pre-exposure levels. Fish exposed to test concentrations matching their pre-exposure levels, clearly preferred this same concentration over the adjacent lower or higher test concentration.
A two mechanism avoidance model was proposed independent of toxicant used or level of pre-exposure. The toxicant concentration where the second mechanism begins to dominate was referred to as avoidance breakpoint, and was correlated to a MATC level for the toxicant in question. Olfactory responses were proposed to be associated with fish avoidance responses below the avoidance breakpoint, while hypoxic stress along with osmo- and iono regulatory stress appeared to be responsible for driving fish avoidance reactions beyond the avoidance breakpoint.
A clearance period of 7 days was sufficient to allow fish to recover normal avoidance behaviour following pre-exposure to Cr(VI) below the avoidance breakpoint.
Kabir, Anwar. "Dechlorination of chlorinated organic compounds by zero-valent and bimetallic mixture." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31246.
Full textA number of scientists have become involved in the development of intentional degradation methods/techniques for these compounds using zero-valent metals or bimetallic mixtures. To date, there is no single, simple and continuous procedure available to completely dechlorinate lindane or pentachlorophenol (PCP). This work describes the complete dechlorination of lindane and pentachlorophenol by zero-valent Zn, Fe and Fe/Ag bimetallic mixture as well as a supercritical fluid extraction technique for a more efficient mass transfer of the substrates to the surfaces of the metal catalyst. The dechlorination reaction occurs on the surface of metal particles with the removal of all the chlorine atoms from lindane and PCP in a matter of minute, and yields completely dechlorinated hydrocarbon molecules and chloride as products. (Abstract shortened by UMI.)
Tam, Chee-yun Joyce, and 談知恩. "Review on application and feasibility of biodiesel in Hong Kong and how government policies can support industry efficiency?" Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B48543561.
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Environmental Management
Master
Master of Science in Environmental Management
El-dabbagh, Fadi. "Novel technique and facility for thermal treatment of solid residues." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=84238.
Full textThis dissertation describes the detailed design and construction of a novel pilot-scale combustion facility, called the Multi-Mode Combustion Facility (MCF), used as a multidisciplinary research tool for investigating the thermal remediation of contaminated solid residues. The MCF is capable of operating in two different modes: Fluidized-Bed combustion mode (FBC) and Single burner furnace mode (SBF). However, this project focuses on the FBC mode (minimum fluidization velocity of 0.42 m/s and bed temperature of 1073 K).
This research compares the combustion characteristics of de-inking sludge obtained in the LHL and in the conventional combustion techniques. The following properties of particulates were studied: morphological evolution of solid particles, structural porosity, metals interactions with fly ash particles, and leachability.
The LHL's final supermicron spherical fly ash went through a molten phase with submicron particles attached to the fly ash particles surfaces. Thus, reducing its porosity to 19%. However, the amorphous final fly ash obtained in the conventional technique reveals 32% porosity. It was found that the physical characteristics of the final LHL's fly ash are the main cause for the reduced heavy metals leachability rates of 0.18, 0.046, and 0.92% for Cd, Cr, and Pb, respectively. The conventional technique had 53.28, 16.79, and 5.20% of Cd, Cr, and Pb respectively, leaching out due to the high porosity percentages. In conclusion, the LHL technique allows for controlling the heavy metals emission from FBCs, while using a waste to energy approach and maintaining environmentally acceptable gas emission levels.
Deumié, Florence. "The Cartagena Protocol on Biosafety and the international trade of genetically modified organisms : a new element of the conflict between trade and the environment." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31156.
Full textAll information is correct as at 14 November 2000.
Heatherington, Tracey. "Environmental politics in a highland Sardinian community." Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=68102.
Full textOrie, Kenneth Kanu. "Legal aspects of groundwater quantity allocation and quality protection in Canada." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=41192.
Full textThe challenge facing Canada is to make the law recognize and be more responsive to the unity of the aquatic environment and water resources. An active federal role in uniting and coordinating the efforts of the provinces in this regard is crucial if this challenge is to be met. However, since the constitutional division of powers in Canada encourages a fragmented approach to managing environment and water resources, the federal government is incapacitated, purely on a legal score, with respect to pulling together the efforts of the provinces. A cooperative approach, based on political rather than legal coordination, is therefore, the most realistic option for the federal government to meet the challenge.
In this work, the writer examines the various areas for federal-provincial cooperation regarding groundwater allocation and protection. Such institutional integration or cooperation cannot be effective unless groundwater is addressed together with the other component of the hydrologic cycle, namely: surface water and the ecosystem they support. At the same time, in adopting an integrated hydrologic cycle approach, specific groundwater management strategies canvassed in this work must be taken into account if groundwater is to be more efficiently allocated and protected. Pursuant to these considerations, this writer is of the opinion that groundwater resources in Canada should be managed in a way that meets both present and future needs of Canadians, thus in a sustainable fashion. This can best be achieved if resource management relies upon a combination of contaminant-focused and resource-focused approaches adopted under unified federal-provincial efforts as well as under an integrated hydrologic cycle management.
Cantin, Danielle 1967. "Response of Pinus banksiana (Lamb.) families to a global change environment." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=68159.
Full textThe CO$ sb2$T$ sp circ$ environment had a significant effect on most biomass components of seedlings and water-use efficiency but not on height and other growth variables. The nitrogen fertilization was generally the most significant effect of the treatments for most growth variables.
All the families responded in a similar way to variations in the growing environments except for WUE. Family differences were more important for measurements of height and growth variables than for biomass components. The architecture of seedlings was also highly variable between families. Norm of reaction graphs were built for several growth variables to outline which families were overall most successful in an enriched CO$ sb2$T$ sp circ$ environment. Of the 15 families studied, four of them were classified as most successful in a projected high CO$ sb2$T$ sp circ$ climate.
Cook, Nicola. "Bioavailability of trace metals in urban contaminated soils." Thesis, McGill University, 1997. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=34934.
Full textA critical review of the literature dealing with predicting the availability of trace metals to plants is presented in Chapter 3. We found little agreement among hundreds of similar studies which relate plant metal uptake to the amount of metal extracted by selective chemical dissolution procedures. An extensive summary of the data shows clearly that the extraction methods are not widely applicable. Differences between individual soils, their metal retention capacities, as well as plant factors and environmental conditions contribute to the variability of the results. Alternative ways of assessing bioavailability are suggested.
The experimental component of the thesis focuses on the availability of trace metals to plants. In Chapter 4 the uptake of Cu from different soil pools was examined and the free metal ion (Cu2+) was found to be the best predictor of uptake by lettuce (Latuca sativa cv. Buttercrunch), ryegrass (Lolium perenne cv. Barmultra) and radish (Raphanus sativus cv. Cherry Belle).
In Chapters 5 and 6 we examined the effect of low-cost in-situ treatments on the availability of metals to plants in greenhouse and field experiments. Synthetic zeolites, P amendments, organic matter and clean soil were used and their effect on the bioavailability of Cd, Cu, Pb, Ni and Zn evaluated. The plants for the experimental work were lettuce and perennial ryegrass. Only the clean soil treatment was consistently effective in reducing the concentration of metals in the plant. We also wanted to determine whether the trace metals in the plant tissue came from the soil or from direct deposition of pollutants on the leaf surfaces. We found little evidence that metals in plants were a result of atmospheric fallout.
A method for the accurate analysis of total metal concentrations in a range of contaminated soils including those containing oil and grease was developed (Chapter 7). For this research the trace metals of concern are Cd, Cu, Ni, Pb and Zn---all commonly found in urban/industrial soils. The proposed method using HNO3/HClO4 has several advantages over the common HNO3/H2O2 procedure. We were able to digest larger soil samples and hence the final concentration of trace metals was usually in the range for analysis by inductively coupled plasma atomic absorption spectrometry or flame atomic absorption spectrometry.
Lin, Zhi-Qing. "Trace metal contamination in forests of southern Quebec and pathway studies of airborne metal deposits." Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=40177.
Full textPathways of trace metals deposited in the soil-tree system were elucidated through application of $ sp{54}$Mn and $ sp{65}$Zn on shoot, bark, and soil surfaces in growth-chamber experiments with balsam fir seedlings. Uptake and accumulation by seedlings 70 days after application on the shoot surface was about 25-30% of the remaining activities for $ sp{54}$Mn and $ sp{65}$Zn. Less than 1% of absorbed isotopes was translocated from the bark surface to other plant organs, whereas more than 50% of the radioisotopes absorbed at the shoot moved to the rest of the seedling. Acidic wetness facilitated the metal absorption through tree surfaces. Downward movement of the radioisotopes in podzolic soils was documented, and accumulation in seedlings by root uptake was 5% of the remaining activity for $ sp{54}$Mn and 3% for $ sp{65}$Zn 70 days after application. No appreciable elemental migration from internal tissues to epicuticular wax layers was found, and the leaching ratio was below 0.5 and 1.0% for $ sp{54}$Mn and $ sp{65}$Zn, respectively. This study helps to understand the links between atmospheric deposition and the elevated levels of Mn in trees, and potential effects of acid deposition on the bioaccumulation of toxic metal pollutants in high elevation forests in southern Quebec.
Bernardo, Sandra Maria de Vasconcelos. "Socioeconomic and Environmental Aspects in settlements that produce Mammon: A Case Study in Recreation and New Canaan, Quixeramobim - CE." Universidade Federal do CearÃ, 2010. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=9088.
Full textA busca de novas alternativas de energia renovÃvel à de grande relevÃncia, pois a problemÃtica do aquecimento global tem causado consequÃncias adversas para a populaÃÃo. Fontes advindas dos Ãleos vegetais para a produÃÃo do biodiesel tÃm sido adotadas no Brasil e constituem uma boa opÃÃo para que os produtores rurais possam se inserir na cadeia produtiva dos biocombustÃveis. No contexto do semiÃrido nordestino, a mamona tem sido usada, pois à uma cultura adequada Ãs condiÃÃes de semiaridez. A partir desta compreensÃo, este trabalho teve o objetivo geral de analisar e comparar os aspectos econÃmicos, sociais e ambientais dos grupos de produtores e nÃo produtores de mamona nos assentamentos Recreio e Nova Canaà e, os objetivos especÃficos foram: (i) analisar os indicadores de qualidade de vida, capital social, ambiental, econÃmico e de sustentabilidade entre os nÃo produtores e produtores de mamona, (ii) mensurar os custos e renda da produÃÃo dos produtores de mamona com o plantio e venda no ano de 2009 e (iii) avaliar a situaÃÃo ambiental atravÃs da anÃlise da variaÃÃo dos atributos quÃmicos do solo em funÃÃo dos plantios . A metodologia se baseou em trÃs aspectos visando abranger uma interdisciplinaridade. Primeiramente adotou-se o mÃtodo estatÃstico usando uma amostragem nos dois assentamentos em estudo e a partir dessas amostras foram calculados os Ãndices de qualidade de vida, capital social, ambiental, econÃmico e a partir destes o Ãndice de sustentabilidade. No segundo aspecto foi calculada a renda dos agricultores atravÃs do calculo dos custos, receita e lucro com o plantio da mamona tomando como base o ano de 2009. No terceiro aspecto, o solo foi avaliado nas Ãreas cultivadas e nas Ãreas preservadas coletando-se amostras compostas e realizando-se anÃlises fÃsicas e quÃmicas do material em laboratÃrio. Entre os resultados verificados concluiu-se que nÃo houve diferenÃa significativa entre os grupos de produtores e nÃo produtores de mamona em relaÃÃo aos Ãndices de capital social e ambiental, porÃm houve diferenÃa nos Ãndices de qualidade de vida, econÃmico e de sustentabilidade. NÃo se comprovou incremento de renda entre os produtores de mamona. No aspecto pedolÃgico foi comprovado que as Ãreas preservadas se mostraram com teores mais elevados de matÃria orgÃnica e de nutrientes, representando indÃcios de degradaÃÃo na Ãrea cultivada.
The search for new alternatives of renewable energy is of great importance, since the issue of global warming has caused adverse consequences for the population. Resulting sources of vegetable oils for biodiesel production have been adopted in Brazil and are a good option so that farmers may be inserted in the production chain of biofuels. Within the semiarid Northeast, castor bean has been used because it is an appropriate culture semiarid condition. From this understanding, this work was the general purpose of analyzing and comparing the economic, social and environmental groups of producers rather than producers of castor in the settlements Recreio and Nova CanaÃ, and the specific objectives were: (i) review the indicators quality of life, social equity, environmental and economic sustainability among non-producers and producers of castor, (ii) measure the costs of production and income of producers of castor oil with the planting and sale in 2009 and (iii) assess the environmental situation by analyzing the variation of soil chemical properties depending on the plantations. The methodology was based on three aspects in order to cover an interdisciplinary approach. First, we adopted the method using statistical sampling in a study in two settlements and from these samples were calculated for quality of life, social equity, environmental, economic and from these sustainability index. The second aspect was calculated farmers' income through the calculation of costs, revenue and profit with the planting of castor beans using as a base year of 2009. In the third aspect, the soil was evaluated in cultivated areas and preserved areas by collecting composite samples and performing chemical and physical analysis of the material in the laboratory. Among the results obtained it was concluded that there was no significant difference between groups of producers rather than producers of castor oil o growth of capital and environmental, but there was difference in the indices of quality of life and economic sustainability. No consistent increase in income between the producers of castor oil. In pedological point was proven that the preserved areas are shown with a higher content of organic matter and nutrients, suggesting a degradation in the cultivated area
Lima, Rita Mileni de Souza. "Avaliação de risco à saúde humana decorrente da contaminação da água subterrânea por BTEX provenientes de postos de revenda de combustíveis em Manaus." Universidade Federal do Amazonas, 2010. http://tede.ufam.edu.br/handle/tede/4184.
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CAPES
Nowadays, Manaus has 175 gas stations, and it is estimated that de lifespan of them, that is around 25 years it is near to the end. This increase the probability of gasoline spills that contains Benzene, Toluene, Methylbenzene and Xylenes (BTEX), and, because of their toxicity and potentially adverse health effects it may become a risk for the general population, if groundwater is contaminated. Hence, the main goal of this study was estimate BTEX exposure through groundwater, as well as the human health risks associated with this exposure. A total of 38 gas stations were visited, and samples of groundwater were taken. Samples were analyzed by gas chromatography fitted with a flame ionization detector (FID), after headspace solid phase microextraction. Human exposure was estimated as a combination of three pathways: inhalation, direct ingestion, and dermal absorption during bath for adult men and women, children and babies. Deterministic and probabilistic risk was assessed. Cancer risk for benzene was estimated in 70% of gas stations from south zone and in 40% from north zone, for all genders and ages. At central-south and west zone, no cancer risk associated with benzene was determined. Cancer risk for benzene was estimated to be between 5xE−05 and 105xE−05 above the limit value of 1xE-05. The children were exposed a higher risks. Non-cancer risk associated with benzene were determined in North and South zones, and associated with xylenes in CentralSouth zone. For probabilistic assessment the 95th percentile of risk was estimated to be 6E−05, indicating that cancer risk is not negligible. Non-carcinogenic risks for toluene, ethylbenzene, and xylenes were lower than the specified level of 1.0. Since health risk associated to BTEX was identified, a monitoring routine need to be implemented by environmental and public health agencies.
Em Manaus existem atualmente 175 postos de gasolina, e estima-se que a vida útil dos tanques de armazenamento de combustíveis desses postos, que é de aproximadamente 25 anos, esteja próxima do final. Assim, aumenta a possibilidade de ocorrência de vazamento ou derramamento de gasolina que contém Benzeno, Tolueno, Etilbenzeno e Xilenos - BTEX, substâncias tóxicas que podem colocar em risco a saúde da população se houver contaminação da água subterrânea, importante fonte de abastecimento domiciliar. Desta forma o objetivo deste trabalho foi avaliar os riscos à saúde humana decorrentes da contaminação da água por BTEX a partir da gasolina provenientes dos postos de revenda de combustíveis da cidade de Manaus. Para isso foi realizado um levantamento dos postos de revenda com poços de água subterrânea, bem como suas condições e tempo de funcionamento. Para quantificação de BTEX na água foram amostrados 38 poços. A análise dos BTEX foi realizada por cromatografia gasosa com detector FID após micro - extração em fase sólida – SPME com headspace. A exposição pela ingestão da água, absorção dérmica e inalação durante o banho foram estimadas para homens, mulheres, crianças e bebês. Foi avaliado o risco de forma determinística e probabilística. Riscos carcinogênicos pela exposição ao benzeno foram encontrados em 70% dos postos na zona sul e 40% da zona Norte para todas as faixas etárias e gêneros. Nas zonas centro-sul, leste e oeste não foram detectados riscos carcinogênicos pela exposição ao benzeno. Nas zonas onde foi encontrado risco de câncer, o mesmo variou de 5 a 10 casos a cada 100.000 habitantes, estando estes valores acima do limite estabelecido de 1 caso para cada 100.000 habitantes. As crianças são o grupo etário exposto a maiores riscos. Em relação aos riscos não carcinogênicos pela exposição aos BTEX, a exposição ao benzeno representou riscos nas zonas norte e sul, e a exposição aos xilenos na zona centro sul. Na avaliação probabilística, o risco carcinogênico para o percentil de 95% da população foi menor que 6 casos por zona, confirmando os dados da avaliação determinística. Os riscos não carcinogênicos com exceção do benzeno, não foram significativos para os demais TEX. Assim, a avaliação indicou riscos à saúde relacionados aos BTEX oriundos de vazamentos de combustíveis de posto de revenda existentes na cidade. As zonas centro-sul, norte e sul são as zonas onde os riscos aos BTEX foram significativos, logo a implantação de uma rotina de monitoramento por parte da agência de controle ambiental bem como da vigilância à saúde se faz necessário, uma vez que o uso da água subterrânea oferece riscos carcinogênicos à população.
Kim, Jun-Kyoung 1973. "Catalytic hydrodechlorination of chlorophenols." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=98739.
Full textAs a detoxification hydrodechlorination (HDC) reactions change neither the thermodynamics of the reaction nor the equilibrium composition. Also, there is no possibility of producing hazard by-product such as polychlorodibenzodioxins and polychlorodibenzofuran.
Liquid phase hydrodechlorination of 4-chlorophenols was studied over the temperature range from room temperature (R.T) to 80°C using various Nickel catalysts and active hydrogen sources. Raney Nickel system converted 4-chlorophenol to ~49 mol% of phenol and ~34 mol% cyclohexanol at R.T. and proved to be more reactive than Ni0 and Ni-Fe. The HDC system with borohydrides as hydrogen source achieved hydrodechlorination at lower temperature than the system with molecular hydrogen. Ni-Al proved to be reactive for hydrogenolysis in the presence of borohydride at R.T. A somewhat surprising temperature dependence of Ni-Al mediated HDC in absence of H2 and borohydride was absented. Optimization with Ni-Al under mild condition was performed using central composite design (CCD). Optimal condition for maximum phenol production was predicted to be 80°C, for 11 h with 30 mg of catalyst. 98 mol% phenol is produced under this condition.
A continuous stream of pentachlorophenol (PCP, 0.5 mg/min) in mixture of supercritical carbon dioxide (scCO2) and hydrogen was hydrodechlorinated by a heated column of gamma-alumina supported palladium (5 % w/w). Dechlorination efficiencies and time to reach equilibrium were influenced appreciable by the temperature and substrate delivery rate. The product from reaction at 210°C, 2000 psi accounted for 92 mol% phenol and 2.3 mol% cyclohexanone. The temperature was maintained at 210°C while the pressure and content of H2 in the gas mixture was changed to 1000 ~ 2000 psi, 5 % and 16 % (v/v) H2/CO2. The production of phenol and cyclohexanone was greater at higher pressures (2000 psi.) with the formation of methoxy-cyclohexane. The content of H2 in the gas mixture was not appreciable influenced the product distribution.
Samuel, Hilary R. (Hilary Ruth). "Educating for sustainable development : a case study of an environmental immersion school." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=60475.
Full textExamination of the literature on educational change led to an analytical framework which included: (1) Characteristics of the innovation; (2) Strategies and tactics used; (3) Contextual characteristics; (4) Macro sociopolitical factors. This was used to categorize qualitative data collected through interviews, observation, a questionnaire and documents.
The study uncovered a number of obstacles to implementation in the school, principally: (1) Conceptual problems about environmental education; (2) Poorly defined school philosophy and goals; (3) Difficulties in coordinating the project between individual efforts and departments; (4) A hiatus between administration and teacher perceptions.
The case study provided insight on the process of curriculum implementation as well as specific issues relating to environmental education and the theme of sustainable development.
Beaudry, Suzanne. "Effects of forest site preparation methods on carabid beetle (Coleoptera:Carabidae) diversity." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22718.
Full textReyes, Delgadillo Dulce B. "Modeling natural attenuation of trace elements in soils." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=101169.
Full textWe analyzed soil properties in 40 soils and their soil solutions to obtain a set of equations with the most significant predictors of As, Cd, Co, Cu, Mo, Ni, Pb and Zn in solution. The total element concentration and the pH were the best predicting variables of the amount of element in solution for all trace elements analyzed, while organic carbon and Al or Mn oxides also influenced the solubility of some trace elements. Using the equations predicting elemental solubility, we wrote a model for natural attenuation in the computer program Stella that considers atmospheric deposition as the input for trace elements and leaching as the output. Simulations were carried out for the 40 soils during 1,000 years with steady deposition inputs.
At current atmospheric deposition rates and the neutral to alkaline pH of these soils, attenuation occurred in most soils for Mo. For As, Cd, Co, Cu and Ni it occurred only in soils with abundant total element concentrations or an acidic pH. Minor retention occurred with Pb and Zn. Only Cd and Cu were of concern in leaching waters. The developed model can serve as a decision making tool in the selection of natural attenuation as a remediation strategy.
De, Serres Martine. "Environmental policymaking for air transportation : toward an emissions trading system." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=112600.
Full textThis thesis is an attempt to determine the best possible course of action for the industry. To this end, it begins by assessing contemporary understanding of aviation's impact on the environment, and provides an overview of efforts being made toward reducing aircraft emissions. It then examines various policymaking tools available to best address the issue, concluding with an emissions trading system. Finally, design characteristics of such a system are suggested, and used to provide an analysis of the European attempt to include aviation into its own emissions trading system.
De, Icaza Aneiros Carlos. "The effects of the North American Free Trade Agreement on Mexican environmental laws and policies and their enforcement : evaluating six years of cooperation (1994-2000)." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31155.
Full textIn this context, on January 1, 1994, the North American Free Trade Agreement entered into between Canada, Mexico and the United States came into force. This agreement has significant environmental content and includes a side agreement on environmental matters. This new framework of environmental protection is serving to reconcile trade and environmental goals in the region, and is shaping the new legal framework for environmental protection and enforcement in Mexico.
MacDonald, Elaine. "Aspects of competitive adsorption and precipitation of heavy metals by a clay soil." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=26406.
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