Chapter_12 - WASTE MANAGEMENT WASTE AS A RESOURCE Concept...

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WASTE MANAGEMENT: WASTE AS A RESOURCE
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Concept of waste management Landfills are running out of space and the costs are rising rapidly for disposal of waste Siting problems for a landfill or incenerator include, site suitability factors such as geographic, geologic and hydrologic environment Social and economic justice are emerging fields as these sites are near people who are ethnic minority or lower economic status Waste disposal is a $20 billion industry
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Introduction (contd) Earlier philosophy was dilute and disperse, which worked as the population and hence the waste were both low The new philosophy is REDUCE, RECYCLE and REUSE tenets of Integrated Waste Management (IWM) Recycling can reduce weight of urban waste by 50% and should be practiced
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The amount of urban waste has reduced from 90% to 65% (1980-present) As the population increases, even recycling will not be able to keep abreast of waste produced. The new concept is materials management
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Materials management With a goal of zero waste production… Eliminate subsidies for timber, minerals, oil Green buildings using recycled materials for construction Financial penalties for non-compliance of materials management and vice-versa Incentives in jobs for materials management
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The various wastes that are transported from urban settings
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Even with our recycling, paper and plastics as a percentage have not decreased….
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Disposal Methods On-Site Disposal Flushing of the waste into the sewer system which ends in the sewage treatment plant Composting Biochemical process resulting in organic matter called compost used in agriculture [not used in US] Incineration Burn waste at high (1000C) temperature. Results in ash which can be disposed in landfill but results in nitrogen and sulfur dioxide emissions/acid rain Open Dumps Oldest, commonest and most un-hygenic method
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Sanitary landfill Buried in the ground under a specially designed tarp. Potential hazards include leachate mineralized liquid with bacteria may enter the groundwater system. Escape of methane gas which is a by- product of the decomposition
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The above figure shows that the landfill has low probability of Contaminating the GW. The figure below shows a scenario where Pollutants can escape into the groundwater
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