Biofiltration of Odorous Compounds in Municipal Solid Waste Landfill Gases

생물탈취상에 의한 도시폐기물 매립지가스내 악취물질의 처리

Biofiltration is an attractive technique for elimination of VOCs and odorous compounds from low-concentration, high-volume waste gas streams because of its simplicity and cost-effectiveness. The objective of this study was to estimate the removal characteristics of Odorous Compounds including $H_2$S, $NH_3$End BTEX in MSW landfill gases. This Study was conducted at Nanjido landfill site. A compost from the Nanjido composting facility was used as a filling material for biofiltration. Extracted landfill gases were injected into biofilter reactors after mixing with air. Experiments were performed in an incubator being set to $20^{\circ}C$ $H_2$S concentrations were monitored at the depths of 25, 50, 75 and 100cm from the bottom Of the biofilter reactors. 98% of $H_2$S was removed at the filling depth of only 25cm. NH$_3$removal rate was about 85%. Toluene removal rate was the highest among BTEX. Significant pH drop of a filling material was not observed during the biofilter operation of 1 month. Without mixing the landfill gas stream with all, the removal rate of $H_2$S decreased down to 30%.

퇴비를 충전물질로 사용한 생물탈취상으로 난지도매립지에서 발생되는 매립지가스 처리시 악취유발물질 및 휘발성 유기화합물의 제거특성과 생물탈취상의 적용가능성을 평가하고자 하였다 본 연구는 난지도매립지 상부에서 실시하였으며 충전물질로는 난지도퇴비화시범시설에서 생산된 퇴비를 사용하였다. 약 15ppmv로 유입된 황화수소는 25cm충전깊이에서도 98%이상 제거되었으며 산소공급중단 후 혐기성가스만 유입시에는 처리효율이 30%로 저하하였다. 평균유입농도 40ppmv에서의 암모니아 제거 효율은 85%정도이었다. BTEX중 톨루엔과 에틸벤젠의 제거효율은 80%로 벤젠과 자일렌보다 높았다. 수분손실은 가스유입구에서 가장 높게 나타났으며 약 30일 운전기간 동안 pH저하에 의한 산성화는 발생하지 않았다.