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AWT STEP-BY-STEP GUIDE
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Case Studies
Case Studies
August 2020
Pyrolysis
07 Aug, 2020
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View Counts (152)
According to the Knowledge Product (KP)studies commissioned by the Department of Environmental Affairs (DEA), Pyrolysis is the thermal degradation of a substance at high temperatures in the absence of oxygen. It involves the simultaneous change of chemical composition and physical phase, is irreversible and requires a relatively consistent waste stream. Use was made of manual provided by GreenCape and approved by the Western Cape Department of Economic Development and Tourism, ‘Towards int...
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Open Windrow Composting
07 Aug, 2020
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View Counts (193)
According to the Knowledge Product (KP) studies commissioned by the Department of Environmental Affairs (DEA), open windrow composting (OWC) takes place in the open air in large, elongated, uniform long, pyramid shaped ‘piles’ of waste known as windrows. The waste feedstock is mechanically shredded and placed into long windrows on a solid, non-permeable surface. Water may be added, depending on the moisture content of the waste. The windrows are turned regularly, either with a wheele...
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Mechanical Biological Treatment
07 Aug, 2020
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View Counts (95)
According to the Knowledge Product (KP) studies commissioned by the Department of Environmental Affairs (DEA), mechanical biological treatment (MBT) combines both mechanical and biological treatment methods (open windrow composting, materials recycling facilities, anaerobic digestion and in-vessel composting). These are supported by a combination of pre-treatment and sorting techniques at the beginning of the process, and a selection of emissions control and quality control techniques at the end...
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Landfill Gas to Energy
07 Aug, 2020
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View Counts (155)
According to the Knowledge Product (KP) studies commissioned by the Department of Environmental Affairs (DEA), landfill gas (LFG) to energy is the process of using the energy of biogases such as methane gas produced by anaerobic biodegradation in a landfill for heating or generating electricity. Waste to energy (WtE) is a system of energy recovery and consists of the pipelines and pumps to extract gas, a flare and the plant to harness the heat or to generate the electricity (for example gas engi...
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Incineration
07 Aug, 2020
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View Counts (89)
According to the Knowledge Product (KP) studies commissioned by the Department of Environmental Affairs (DEA), incineration is the direct combustion of urban solid waste material coupled with subsequent energy recovery. The heat resulting from the combustion process can be used to generate heat and electricity through a steam circuit system. This is referred to as a combined heat and power process (CHP). Use was made of the manual provided by GreenCape and approved by the Western Cape Department...
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In-vessel Composting
07 Aug, 2020
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View Counts (263)
According to the Knowledge Product (KP) studies commissioned by the Department of Environmental Affairs (DEA), in-vessel composting (IVC) is a method of accelerating the composting process within an enclosed environment. Waste is screened and any oversize items removed. The waste is then shredded or chipped to increase the surface area and reduce the average material size. Source segregation of organic wastes often requires a limited amount of treatment before composting. The composting process ...
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