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Methane Recovery and Utilization in Landfill Waste rotting in landfill
produces a mixture of up to 50% methane as landfill gas (LFG), and
35% carbon dioxide; while open burning produces 5 - 10%. Controlled
combustion in a power plant converts virtually all
of the carbon in the biomass to carbon dioxide. Because methane
is a much potent greenhouse gas, shifting its emissions to
carbon dioxide emissions during flaring significantly reduces the greenhouse warming potential.
Landfill gas projects account for over 14% of Clean
Development Mechanism projects. By
far the best in reducing greenhouse gas emissions are projects that
address methane emissions from landfills, achieving up to 160% more
reduction than promised!
(Summary
Statement and Conclusions of the International Conference on
Evaluating Climate Change and Development, May 12, 2008)
Environmental pollution can be minimized by eliminating the generation of nitrogen oxide and voc (volatile organic compound) from the landfill site. Project can help reduce the emission of substantial carbon dioxide every year. The use of underground space for waste treatment provides environmental benefits superior to surface option. It reduces sound pollution, air and odor pollution besides eliminates undesirable visual impacts. It also minimizes health hazards arising from air exposure of wastes.
The STW Recreation Ground in Hong Kong Was Formerly a Landfill During its operation, the landfill contained approximately 1.6 million tonnes of domestic and commercial wastes, stacked to 65 m high. After its closure, it was sealed with soil. The landfill underwent a series of restoration works and was finally turned into a recreation ground. The restoration included construction of a capping layer for prevention of leakage, a landfill gas control system for utilization of methane gas generated from the decomposed rubbish, and a leachate management system.
The recreation ground has a multi-purpose sand-based, grass pitch which can be used for baseball and football activities, two baseball batting cages, a playground, a jogging track, two changing rooms and a management office. Unlike most urban areas which relies mainly on electric supply, the Ground is powered by wind turbines, solar cells and LFG combustion. Landfill or gold mine? In Japan's landfills, there is enough gold, silver and platinum to propel the country into the top tier of resource-producing countries - along with Australia, Brazil and Canada. The millions of electronics that are discarded each year, including televisions, mobile phones, MP3 players and computers, have created so-called “urban mines.” These mines have untapped resources which if tapped could supply three times as much gold, silver and indium of global demand. The amount of platinum from landfills is six times that of global consumption. (ecogeek.org/content/view/Sep 15, 2008)
Energy Companies Explores Waste To Create
Cleaner Fuels: (Redorbit.com - Jan 31, 2009) According to the Chinese Academy of Sciences Geography and Resources China Natural Resources and Environment Data Bank, the total annual production of manure and night soil could theoretically generate about 130 billion m3 of methane, equivalent to 93 million tonnes of coal. While only 50% of the theoretical production can be realized in rural areas, 80% of the industrial wastewater can also be used to produce methane.
EPA Gives Vic Landfills the All Clear
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Feb 09, 2009
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