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published_or_final_version / Humanities / Master / Master of Philosophy

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Disposal of garden waste is a major concern globally and particularly in a developing / Thesis (M.Sc.Eng.)-University of KwaZulu-Natal, Durban, 2009.

There are 150 million tons of Municipal Solid Waste (MSW) annually produced in the United States, which is approximately equivalent to 150 million barrels of oil. MSW production is inexhaustible, and is increasing on an annual per capita basis of approximately three per cent. After controlling the moisture and adding a binder, the combustible portion of MSW was converted to pellets. The objects of this project were to 1) evaluate the binder, 2) prepare the pellets, and 3) evaluate the pellets with regard to density. The manufacture of pellets was conducted at the Naval Air Station, Jacksonville, Florida. The evaluation of the binders and the pellets was done at North Texas State University (NTSU). There were three procedures for measuring the density. The first, using water displacement, was from the American Society for Testing and Material (ASTM). The second, using wax coating, was also from ASTM. The third, using sharply-cut cylindrical pellets, was developed at NTSU.

This study explores refuse collection as a municipal service using qualitative methods to examine how government makes decisions about residential refuse collection services in Portland, Gresham, and Beaverton, Oregon. The study explores the history of refuse collection in these three cities to identify factors that influence bureaucratic behavior and decision making when selecting a municipal service delivery option for refuse collection. Public choice and public policy analysis theory are used to discuss those non-monetary considerations present when government makes decisions about service arrangements. Qualitative data was collected from public officials and private haulers involved in refuse collection in the three cities. This qualitative process was to capture, in context, the development of the industry. The use of a single criterion in determining choice of private organizational forms may not create the results desired by municipal governments. Choice in the selection of a service arrangement has two important aspects: (1) the array of service arrangement options that can be developed and (2) the contextual environment within which bureaucrats operate and which influences the decision making process. It was found that decisions about which type of service arrangement to use for refuse collection did not always stem from monetary factors such as cost. Non-monetary factors such as tradition, legal considerations, and lobbying can influence decisions about which type of service arrangement to use.

The energy consumption throughout the world has increased substantially over the past few years and the trend is projected to continue indefinitely. The primary sources of energy are conventional fuels such as oil, natural gas and coal. The most apparent negative impacts of these conventional fuels are global warming, poor air-quality, and adverse health effects. Considering these negative impacts, it is necessary to develop and use non-conventional sources of energy. Landfill gas (LFG) generated at landfills can serve as a source of cleaner energy. LFG has substantial energy generation potential and, if cleaned of certain impurities, can be used for several applications such as electricity generation and conversion to high Btu gas. This thesis considers another application of LFG, which consists of using it as a vehicular fuel for refuse trucks. Currently, limited research has been performed on the development of such a methodology to evaluate the application of LFG as a vehicular fuel for refuse truck operations. The purpose of this thesis is to develop a methodology that can be used to evaluate the use of LFG generated at landfills as a Liquefied Natural Gas (LNG) fuel source for refuse trucks in Texas. The methodology simulates the gas generation process at a landfill by using standard models developed by the Environmental Protection Agency. The operations of a refuse truck fleet are replicated by using generic drive cycles developed as part of this research. The economic feasibility is evaluated by estimating the costs required for cleaning the LFG and converting the truck fleet from diesel to LNG as well as quantifying the benefits obtained due to change in fuel consumption and emission generation by the refuse trucks. The methodology was applied to a potential landfill in Texas. The results show that the methodology offers an innovative tool that allows the stakeholders to evaluate the economic feasibility of using LFG for refuse truck operations. The methodology also provides a flexible framework wherein each component can be changed or tailored to meet the specific needs of the stakeholders.

Thesis (Ph. D.)--University of Hawaii at Manoa, 2003. / Includes bibliographical references (leaves 156-164).

In the postmodern era, the industrial sector faces a number of pressures. These pressures include keeping within the new and stricter laws, avoiding the stricter penalties in terms of finances and legal penalties, avoiding bad publicity that occurs through bad environmental action and responding to pressure groups and public concern, including industry's own work force (Stapleton, 1996). Industry can respond to these pressures to become involved in efforts to 'green' their activities, for example. introducing waste minimisation practices into production. To this end, the Pollution Research Group of the University of Natal, Durban was instrumental in developing the Hammarsdale Waste Minimisation Club early in 1999. Since its inauguration, this Club has been active in two primary spheres, namely, the implementation of waste minimisation into the industrial processes of member companies and the building of capacity of a range of employees of member companies. This thesis provides a case study of the Hammarsdale Waste Minimisation Club in an attempt to assess the role of voluntary participatory organisations in sustainable development. This study of the role of voluntary participatory organisations in sustainable development has taken place within the context of waste minimisation, waste minimisation clubs, and the specific characteristics of the Hammarsdale Industrial Complex and the regulatory context of South Africa. A combination of geographical and social theory has been used to study the characteristics of the Hammarsdale Waste Minimisation Club. Four bodies of literature have been drawn together to form a conceptual framework through which the case study can be analysed and understood. These bodies of literature cover the characteristics of postmodernism, the paradigm of sustainable development, social theory regarding civil society and social movements (including the environmental movement) and the impact of locality on activities. Primary data for this study has been gathered through the use of participant observation and semi-structured interviewing techniques. The theoretical framework has played an important role in a process of qualitative data analysis and interpretation that aimed to establish answers to the research questions generated in this study. Analysis of the Hammarsdale Waste Minimisation Club as a voluntary participatory organisation has revealed that these organisations do play a role in the achievement of sustainable development in two ways. Firstly, through the way in which they are organised and secondly, through the activities in which members of the organisation engage. The case of the Hammarsdale Waste Minimisation Club, the Club has been organised in such a way as to promote the implementation of waste minimisation and to provide capacity building as extensively as possible. One important characteristic of the Hammarsdale Waste Minimisation Club is the strong sense of mutual support and community that has developed. These relationships enable the organisation to contribute to sustainable development as they facilitate the participation and procedural equity necessary to the achievement of sustainable development. Despite this, the organisational structure of the Club can be seen to have some weaknesses. For example, the failure to develop a constitution and the high level of dependency on the groups of professionals in the Club which has lead to the need for motivation and leadership. It is possible that these weaknesses may lead to the decline of activities in the organisation or demise of the Hammarsdale Waste Minimisation Club in the long-term, thus inhibiting the role of the Club in sustainable development. By comparison, the waste minimisation implementation and capacity building activities of the Hammarsdale Waste Minimisation Club enable the Club to make a direct contribution to sustainable development. The implementation of waste minimisation enables industry to become more efficient thus reducing its impact on the environment. Furthermore, capacity building has created a greater awareness of environmental matters while equipping employees of member companies with the skills to carry out waste minimisation for the benefit or the environment. Thus these activities can contribute to sustainable development through the increased care of local ecosystems and a reduction of the impact of industry on this natural environment. Through these findings, this study proposes that if voluntary participatory organisations can be organised to provide a long-term motivational and facilitative framework through which activities that contribute to sustainable development can take place, then these organisations have an important role to play in bringing about on-the-ground changes which can lead ultimately to the achievement of sustainable development. Contrary to this, if care is not taken to create a voluntary participatory organisation that will be sustainable itself, the potential role of the organisation in sustainable development is reduced. Notably, these findings are reliant on the investigation of one case study. It is suggested that further examinations of a wide range of voluntary participatory organisations would enhance these findings by creating a more general picture. / Thesis (M.A.)-University of Natal, Durban, 2000.