음식물류 폐기물을 원료로 하는 침출수 순환형 중온 혐기성소화조의소화효율 (A Study on Efficiency of Mesophilic Anaerobic Digestion System with Leachate Recirculation Using Source-sorted Food Waste)

서지정보

· 발행기관 : 한국도시환경학회
· 수록지 정보 : 한국도시환경학회지 / 17권 / 1호 / 57 ~ 63페이지
· 저자명 : 조찬휘, 이병희

초록

본 연구에서는 음식물류 폐기물을 원료로 하여 침출수 재순환이 있는 중온 혐기성 소화 시스템을 통해 바이오 가스를생산하였다. 실험은 동일한 구성 (생물반응조, 침출수 저장조)으로 이뤄진 System A와 System B를 통해 진행하였으며, 각 System은 투입 음식물류 폐기물의 차이만이 있었다. 생물반응조 하단 상부 30 mm 위치에 스크린을 두어 고액분리가용이 하도록 하였으며 이를 통해 분리된 액체가 매일 30분씩 각각 침출수 저장조로 이송되고 다시 침출수 저장조 내 액체가 생물반응조 상부로 30분 동안 유입되도록 하였다. 음식물류 폐기물은 반응조로 투입되기 전에 36oC로 가온하였다.
저해인자에 대한 파악을 하기 위해 암모니아성 질소와 염분에 대해 조사하였다. 평균 메탄발생량은 System A의 경우0.115 L CH4/g VS로 나타났으며 System B의 경우 0.167 L CH4/g VS로 나타났다. 암모니아성 질소와 염분농도는 서서히 증가하였는데, 이는 반응조 하단에서 음식물류 폐기물의 압밀로 침출수 재순환이 방해를 받아 미생물 활동이 저해됨에 의해 발생된 것으로 추정된다.

영어초록

Mesophilic anaerobic digestion of source-sorted food waste with leachate recirculation system was studied and its efficiency was evaluated by methane gas production comparison. Two identical systems, System A and B were fabricated equally and each system was comprised of an anaerobic bioreactor and a leachate tank. The only difference between two systems is OLR (Organic Loading Rate). Leachate in bioreactor was separated through the screen located at 30 mm above the bottom and a pump was installed to transfer collected leachate to the leachate tank. Once a day, the leachate was pumped from the bioreactor to the leachate tank for 30min and transferred leachate was pumped back to the top of the bioreactor for 30min, sequentially. Source-sorted food waste used for this experiment was water washed by cafeteria staffs before transferring to the laboratory. Transferred food waste was warmed to 36oC before being fed to bioreactors. Ammonia nitrogen and salinity were monitored to see the inhibition toward anaerobic bioreaction. Average methane productions rates were 0.115 L CH4/g VS and 0.167 L CH4/g VS for system A and B, respectively. Ammonia nitrogen and salinity were increased gradually and it is believed that compression at the lower part of bioreactor blocks leachate penetration and retards the microorganism activity within bioreactor.

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