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Experimental Study on the Biodegradation Process of Organic Waste in Landfill under Arid Climate
( Hirotaka Momose ),( Tahareh Malmir ),( Kazuki Tamura ),( Yasumasa Tojo ),( Takayuki Matsuo ),( Toshihiko Matsuto ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-
Water plays a key role to the stabilization of waste in landfill. The biodegradation process by the microorganism is indispensable for the stabilization of the organic matter in solid waste, and appropriate moisture is necessary for it. For both wash-off of salts and immobilization of heavy metals by weathering, water is indispensable too. However, under arid climate, evaporation is superior to rainfall. And annual water budget on landfill is likely to be negative. Though the moisture that originates in waste exists immediately after the waste disposal, it is gradually lost because there is little supply with the rainfall water. Therefore, it is difficult to expect various phenomena, which naturally occur in landfill under humid climate such as biodegradation of organic matter, the wash-off of salts and weathering of heavy metals etc., in the municipal solid waste (MSW) landfill located in arid region. In recent years, quantity of MSW has been increasing in developing countries along with their economic growth. The situation is the same in the arid region too. There are many huge landfills at where MSW from the emerging mega-cities is disposed of. Up to now, there are few study in which how the biodegradation of organic matter would progress or what degree the waste stabilization reaches are investigated. In this study, biodegradation of waste was traced by column test of which intensive evaporation occurs. Three experimental conditions were set; namely, 1) only allowing drainage and no water was added, 2) leachate obtained from the column is recirculated, 3) leachate is recirculated at constant quantity by adding water. During two months experimental period, waste showed tendency of drying in each column, and only the acid-genesis occurred. From the viewpoint of carbon release, recirculation condition seems to be favorable for stabilization.