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RISS 인기검색어
- 검색키워드
- 저자 : ( Tahareh Malmir ) (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Prediction of Leachate Formation under Arid Climate by using Water Balance Model
( Tahareh Malmir ),( Hiroshi Nomura ),( Yasumasa Tojo ),( Toshihiko Matsuto ),( Takayuki Matsuo ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-
Recently, the amount of municipal solid waste increases rapidly along with the rapid increase in population and economic growth in the developing countries. Even in the developing countries under arid/semi-arid climate, the situation is the same. Under wet climate, leachate formation is inevitable and it continues for a long time. However, under dry climate, evaporation exceeds precipitation notably. It means that the source of leachate is limited mainly to the water derived from the waste that is disposed of. This fact also implies that leachate generation ceases someday and waste inside landfill keeps drying out gradually. However, it is only speculation and it should be elucidated quantitatively. In this study, simple water balance model was created and how long leachate is generated was estimated by using this water balance model and meteorological data obtained under arid climate. According to the Koppen-Geiger climate classification, several meteorological stations under arid climate were selected (meteorological stations in Iran, USA, and Australia) and their climate data from 2000 to 2013 were used for the calculation. As for the landfill, configuration of a small trench which exists in Iran was assumed to exist under each location. Results showed that leachate is generated only for the period in which MSW is disposed of because most of the source of leachate is the moisture derived by the waste and greater part of the precipitation is consumed by the evaporation. After the end of disposal operation, almost no leachate was generated. This fact was common for every region subjected to the calculation. By the calculation, quantity of water inside the landfill was also calculated. Results of all the locations indicated that the quantity of water in landfill started to decrease after the completion of waste disposal operation. This means that waste inside landfill would dry out in future.
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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.
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