젖소분뇨로부터 최대 바이오가스 생산과 유기물 제거효율을 달성하기 위한 반건식 간헐주입 연속혼합 혐기성반응조의 최적 수리학적 체류시간 도출을 위한 연구 (Assessment of Optimum Hydraulic Retention Time (HRT) for Maximum Biogas Production and Total Volatile Solid (TVS) Removal Efficiency of Semi- Continuously Fed and Mixed Reactor (SCFMR) Fed with Dairy )

서지정보

· 발행기관 : 대한환경공학회
· 수록지 정보 : 대한환경공학회지 / 37권 / 12호 / 696 ~ 704페이지
· 저자명 : 강호, 김선우, 정지현, 안희권, 정광화

초록

본 논문은 톱밥 깔개 젖소분뇨 TS 13%를 반건식 간헐주입 연속혼합 반응조(Semi-Continuously Fed and Mixed Reactor, SCFMR)에 주입하여 신재생에너지인 바이오가스의 생산성과 TVS 제거효율을 비교․평가하여 최적 운전조건을 도출하고자하였으며, 그 연구결과를 요약하면 다음과 같다. 톱밥 깔개 젖소분뇨 주입 TS 13%의 반건식 SCFMR의 운전결과 HRT 25일(OLR 4.40~4.50 kg VS/m3-day)에서 최대 바이오가스 발생량 1.44 v/v-d와 CH4 발생량 1.12 v/v-d를 달성하였으며, 이 때 TVS 제거효율은 바이오가스 발생량 기준 37%이었다. 이는 톱밥 깔개 젖소분뇨 1일 100 kg 주입 시 3.60 m3의 바이오가스를 생산하는 결과이다. 높은 유기물 부하율인 OLR 4.45 kg VS/m3-day (HRT 25일)에서 SCFMR의 운전이 안정적인 이유는 주입시료인 톱밥 깔개 젖소분뇨가 갖고 있는 높은 Alkalinity 농도 때문이다. 그 결과 반응조의 Alkalinity는 14,500~15,600 mg/L as CaCO3 범위이었으며, 반응조의 안정성을 평가하는 V/A 비는 평균 0.11, P/A 비는 평균 0.43을 유지하였다.

영어초록

This study was carried out to evaluate the optimum operational condition of Semi-continuously Fed and Mixed Reactor (SCFMR) to treat the dairy cow manure and saw dust mixture. Step-wise increase in organic loading rates (OLRs) or decrease in hydraulic retention times (HRTs) were utilized until the biogas volume became significantly decreased at mesophilic temperature (35℃). The optimum operating condition of the SCFMR fed with TS 13% dairy cow manure and saw dust mixture was found to be an HRTs of 25 days and its corresponding OLRs of 4.45 kg VS/m3-day. At this condition the biogas and methane production rates were 1.44 v/v-d and 1.12 v/v-d (volume of biogas per volume of reactor per day), respectively and the TVS removal efficiency of 37% was achieved. The successful operation with such a high OLR was due to the high reactor alkalinity concentration of 14,500~15,600 mg/L as CaCO3 as a result of the characteristic of the original substrate, dairy cow manure and saw dust mixture whose alkalinity was more than 8,000 mg/L as CaCO3. The parameters for the reactor stability, the ratios of volatile acids and alkalinity concentrations (V/A) and the ratio of propionic acid and acetic acid concentrations (P/A) appeared to be 0.11 and 0.43, respectively, that were greatly stable in operation. Free ammonia toxicity was not experienced due to the long term acclimation by the reactor TS content ranged 7.2~10.4% during the entire operational period.

참고자료

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