The aim of the research was to critically assess and investigate the current solid waste management methods and practices of households and in an urban area in the Nelson Mandela Bay Municipality (NMBM) Bluewater Bay, Port Elizabeth. In order to achieve the research objective, the following sub-research objectives/questions need to be considered: 1. What is the level of awareness and understanding of the waste management principles (avoid, reduce, recycle and dispose) in Bluewater Bay households? 2. How do households handle and manage solid waste in Bluewater Bay? 3. What is the Nelson Mandela Bay Municipality doing to raise awareness regarding waste problems and waste management? 4. What information is disseminated to the public to keep them informed regarding waste management? 5. What incentives and support for the reduction, reuse and recycling of waste does the Nelson Mandela Bay Municipality offer? Fifty households were sampled for the case study and the study employed qualitative research methods consisting of a three-prong approach, the first was the questionnaire for Bluewater Bay residents, the second was semi-structured interviews for relevant Nelson Mandela Bay Municipality officials, and the third was a review of existing national documents pertaining to waste management legislation including national and international literature. The findings of the study show that there is an awareness of waste management principles in the study area and that residents are willing to participate in sustainable waste management activities. Some are already taking part out of their own free will, even though the conditions are not conducive and the environment is not enabling. There is community awareness about waste management principles in the area and a lack of information regarding waste management in general. Residents are willingto avoid, reduce, recycle and dispose of waste sustainably. They find it important but the necessary facilities are not available. The municipality does not provide that in the area. The research also made recommendations in order to realise the implementation of integrated waste management techniques and principles in the area.

In this study, the formation mechanisms, distribution characteristics, and potential environmental risks of hazardous air pollutants from industrial-scale waste incineration processes were investigated. First, to clarify the dominant formation mechanism of polychlorinated dibenzo- p-dioxins and dibenzofurans (PCDD/Fs) in a hazardous waste (HW) incinerator, three tests were designed by adding different precursors in phenol-containing raw materials. With the addition of p-dichlorobenzene, PCDD/F levels at the quenching tower outlet were ten times higher than levels observed at the inlet. This indicates that the quenching tower failed to suppress the formation of PCDD/Fs and surface-mediated precursor reaction is the dominant formation mechanism in low-temperature stages. Besides, adsoprtive memory effect in air pollution control devices (APCDs) also led to high PCDD/F emissions. These findings suggest that to control PCDD/F emissions, strict regulation of chlorine contents in feed materials and frequent cleaning of APCDs are necessary. Meanwhile, single particles and solid residues were collected from the same HW incinerator. Morphologies and elemental compositions of particles in flue gas and indoor air were characterized by transmission electron microscopy-energy dispersive X-ray spectrometry (TEM-EDS). Eight types of single particles were classified, as organic, soot, K-rich, S-rich, Na-rich, Fe-rich, mineral and fly ash particles. The heavy metal partitioning behavior study suggested that Hg, Cd and Pb were mainly enriched in fly ash through evaporation, condensation, and adsorption; while Cr, Cu, Mn, and Ni were mostly remained in the bottom ash due to their low volatilities. In addition, the study also investigated environmental behaviors of certain characteristic pollutants. Thrity-two soil samples surrounding a cement plant co- processing HW were collected and analyzed for the presence of 16 polycyclic aromatic hydrocarbons (PAHs) and 12 heavy metals. Ten samples were selected for PCDD/Fs analysis. The highest concentration of PCDD/Fs occurred 1200 meters downwind from the cement plant. Levels of ∑16 PAHs ranged from 130.6 to 1134.3 μg/kg in soil. Source identification analysis suggested that the cement plant was the most likely source of PAH contamination. The concentrations of Cd and Hg were on average two times and six times higher than background values, respectively. Both incremental lifetime cancer risk model (ILCR) for PAHs and potential ecological risk index (RI) for heavy metals indicate potential risks to the population and the environment surrounding the cement plant. Last, to identify whether waste incineration is a major source for airborne environmentally persistent free radicals (EPFRs), tree leaf samples were collected from 120 sites surrounding four waste incinerators and one urban area. EPFR concentrations on leaves ranged from 7.5 × 10 16 to 4.5 × 10 19 spins/g. For the 10 N.D. samples, they were all collected from areas inaccessible by vehicles. Although previous work has linked atmospheric EPFRs to waste incineration, the evidence in this study suggests that vehicle emissions, especially from heavy-duty vehicles, are the main sources. According to our estimation, over 90% of the EPFRs deposited on tree leaves might be attributed to automotive exhaust emissions, as a synergistic effect of primary exhausts and degradation of aromatic compounds in road dust

The term water clarifier as used in this text refers to a versatile water treatment unit which combines flocculation and coagulation, clarification and positive sludge removal in a single tank. Water clarifiers are very compact units which are being used in municipal and industrial water treatment for the removal of turbidity, algae, color, iron and silica; lime or lime-soda softening; magnesium precipitation; brine clarification; and waste water clarification with or without chemicals. Water clarifier units have found wide use in the sanitary field, providing high removals in the pre-treatment of sewage and in secondary sewage treatment through addition of coagulants.

In this study, the formation mechanisms, distribution characteristics, and potential environmental risks of hazardous air pollutants from industrial-scale waste incineration processes were investigated. First, to clarify the dominant formation mechanism of polychlorinated dibenzo- p-dioxins and dibenzofurans (PCDD/Fs) in a hazardous waste (HW) incinerator, three tests were designed by adding different precursors in phenol-containing raw materials. With the addition of p-dichlorobenzene, PCDD/F levels at the quenching tower outlet were ten times higher than levels observed at the inlet. This indicates that the quenching tower failed to suppress the formation of PCDD/Fs and surface-mediated precursor reaction is the dominant formation mechanism in low-temperature stages. Besides, adsoprtive memory effect in air pollution control devices (APCDs) also led to high PCDD/F emissions. These findings suggest that to control PCDD/F emissions, strict regulation of chlorine contents in feed materials and frequent cleaning of APCDs are necessary. Meanwhile, single particles and solid residues were collected from the same HW incinerator. Morphologies and elemental compositions of particles in flue gas and indoor air were characterized by transmission electron microscopy-energy dispersive X-ray spectrometry (TEM-EDS). Eight types of single particles were classified, as organic, soot, K-rich, S-rich, Na-rich, Fe-rich, mineral and fly ash particles. The heavy metal partitioning behavior study suggested that Hg, Cd and Pb were mainly enriched in fly ash through evaporation, condensation, and adsorption; while Cr, Cu, Mn, and Ni were mostly remained in the bottom ash due to their low volatilities. In addition, the study also investigated environmental behaviors of certain characteristic pollutants. Thrity-two soil samples surrounding a cement plant co- processing HW were collected and analyzed for the presence of 16 polycyclic aromatic hydrocarbons (PAHs) and 12 heavy metals. Ten samples were selected for PCDD/Fs analysis. The highest concentration of PCDD/Fs occurred 1200 meters downwind from the cement plant. Levels of ∑16 PAHs ranged from 130.6 to 1134.3 μg/kg in soil. Source identification analysis suggested that the cement plant was the most likely source of PAH contamination. The concentrations of Cd and Hg were on average two times and six times higher than background values, respectively. Both incremental lifetime cancer risk model (ILCR) for PAHs and potential ecological risk index (RI) for heavy metals indicate potential risks to the population and the environment surrounding the cement plant. Last, to identify whether waste incineration is a major source for airborne environmentally persistent free radicals (EPFRs), tree leaf samples were collected from 120 sites surrounding four waste incinerators and one urban area. EPFR concentrations on leaves ranged from 7.5 × 10 16 to 4.5 × 10 19 spins/g. For the 10 N.D. samples, they were all collected from areas inaccessible by vehicles. Although previous work has linked atmospheric EPFRs to waste incineration, the evidence in this study suggests that vehicle emissions, especially from heavy-duty vehicles, are the main sources. According to our estimation, over 90% of the EPFRs deposited on tree leaves might be attributed to automotive exhaust emissions, as a synergistic effect of primary exhausts and degradation of aromatic compounds in road dust

Bibliography: pages 101-109. / The over-production by Man of waste and the consequent threat to life on Earth motivated this study of urban solid waste legislation and its application in South Africa. "Urban solid waste" was seen as solid waste generated within an urban area by secondary industrial and commercial processes, domestic activities and littering, and deposited on land. The unique South African context, in which the relevant legislation has developed and been applied, was acknowledged. The overall objective was both: a) to ascertain the extent to which the relevant legislation and fulfils its functions in terms of its raison d'etre, and achieves its objectives; b) to formulate guiding principles for reform of the legislation. In order to achieve the overall objective, the following five specific objectives were undertaken: 1; To ascertain which existing and contemplated South African legislation relates to urban solid waste. 2. To establish: * the raison d'etre of legislation, * accepted criteria for good legislation. 3. To evaluate the relevant legislation, using the aforesaid criteria. 4. To ascertain, from waste managers: * problems experienced or foreseen by them whilst operating within the relevant legislation, and * their proposed solutions to those problems. 5. To formulate guiding principles for reform of the legislation.

The Seminole County, Florida solid waste transportation network was examined to determine alternate locations of transfer stations. The scope of this study is limited to transportation and assumed disposal costs. Collection costs are not included. Review of past generation records was conducted and a per capita generation rate of 4 lbs/day was determined. This compared favorably to a 4.06 lbs/day for Orange and Brevard County. The cost per ton for the present solid waste management system was computed and compared to alternative systems. The present system was compared to several alternatives by altering the number and changing the locations of transfer stations to arrive at an optimum cost configuration. Recommended alternate plans are provided which are dependent upon the waste generating districts participating as well as transfer station location in the overall solid waste management system.

The history of solid waste management in Lake County, Florida is reviewed. The role of governmental agencies is mentioned. Local environmental characteristics and transportation systems are discussed. Existing collection and disposal practices are presented. A land use analysis of the unincorporated areas of the County is given. Projections of population and solid waste quantities are listed. Two computer models are presented. Their optimum solutions are analyzed in detail. The cost associated with implementing either plan is presented. A recommended plan is given based on a combination of transfer stations and sanitary landfills.

published_or_final_version / Humanities / Master / Master of Philosophy

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

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.