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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This note was uploaded on 02/10/2011 for the course GEOL 103 taught by Professor Lakshmi during the Spring '10 term at South Carolina.

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

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