earticle

영어

In this study, investigation of wastes produced in Daejeon was assessed about mixing ratio and toxicity in batch test. Also a continuous dry anaerobic digestion was operated to investigate biogas production with food waste and paper under mesophilic condition. According to result, waste production in Geumgodong first landfill site located in Daejeon had a different characteristics depending on regions and seasons. The batch test for mixing ratio was resulted as follows: Methane production rate according to mixing ratio (food:paper, (w/w)) of 8:2, 7:3, 6:4, and 4:6, were 40.2 mL/d, 40.4 mL/d, 36.6 mL/d, and 36.6 mL/d, respectively. In toxicity test, biogas production of reactor decreased with the increase of ammonia and sodium concentration. At ammonia concentration of 5.0 g NH4-N/L, 50% inhibition in biogas production was observed when compared to control, 2.0 g NH4-N/L. In the continuous dry digestion, solid loading rate (SLR) was controlled as 2.3 kg TS/m3/d, 3.5kg TS/m3/d, and 5.8 kg TS/m3/d by changing hydraulic retention time (HRT) to 150days, 100 days, and 60 days respectively, at a substrate concentration of total solid (TS) of 35%. During this periods, pH and methane contents in the reactor showed 7.8~8.2 and 52~55%, respectively. Performance of reactor at HRT 60 days achieved methane production yield of 0.32 m3 CH4/kg TSadded and over 78% of volatile solids (VS) reduction.

한국어

본 연구에서는, 대전시 에서 발생하는 생활쓰레기의 성상을 알아보고, 회분 실험을 통해 혼합비율과 독성에 따른 바이오가스 발생량을 조사하였다. 또한, 음식물과 종이를 중온 조건에서 혼합하여 연속 건식 혐기성 소화를 수행하였다. 결과에 따르면, 대전에 위치한 금고동 제 1 매립장에서 발생하는 폐기물은 지역과 계절에 따라 다른 특성을 나타내었다. 혼합비에 대한 회분 실험 결과를 살펴보면, 메탄 생산 속도는 음식물과 종이의 비율(w/w)을 각각 8:2, 7:3, 6:4, 4:6으로 하였을 때, 40.2 mL/day, 40.4 mL/day, 36.6 mL/day, 36.6 mL/day로 나타났다. 독성 실험에서 바이오가스의 발생량은 암모니아와 나트륨의 농도가 증가 할수록 감소하였다. 암모니아 농도가 5.0 g NH4-N/L일 때, control(2.0 g NH4-N/L)에 비하여 50%의 바이오가스 발생량 감소를 관찰하였다. 연속 건식 운전에서는, HRT를 150 day, 100 day, 60 day로 감소시키면서 고형물의 혼합 농도를 35%로 고정 시켜 고형물 부하율(Solid Loading Rate, SLR)을 각각 2.3 kg TS/m3/d, 3.5 kg TS/m3/d 그리고 5.8 kg TS/m3/d로 변경 하였다. 운전 기간 동안 pH 및 메탄 농도는 7.8~8.2와 52~55%를 유지하였으며 HRT 60일에서 0.32 m3 CH4/kg TSadded를 나타내었고 VS 제거는 78% 이상이었다.