매립지 침출수 재순환을 통한 매립가스 증산효과 분석

초록

The sanitary landfill method not only stops leakage of leachate and landfill gas to the outside, it also prevents wateror air ingress. These methods significantly reduce the environmental contamination of landfills. Recently, landfilling oforganic wastes such as sewage sludge and food waste has been forbidden, and landfilled wastes are dried. In addition,the water supply from outside is blocked, and the inside of the landfill remains very dry using the sanitary landfill method. At present, municipal solid-waste landfills have a generalized landfill-gas recovery and energy conversion. However,delayed decomposition of waste due to drying of the landfill will prolong the post-management period and reduce theamount of landfill gas after final disposal, which has a serious impact on the economics. In this study, a leachaterecirculation facility was installed at the SUDOKWON landfill site in Incheon to prevent drying of the inside of thelandfill. We investigated the effects of leachate recirculation on landfill gas evolution by observing the changes in watercontent and landfill-gas collection. As a result, the amount of landfill gas collected after recycling the leachate for about34 months showed an increase of about 71% compared to the control. Therefore, the increase of water content throughleachate recirculation greatly influences landfill-gas production, and it can increase the return from the landfill-gas energyproject.

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