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J Korean Soc Environ Eng > Volume 37(12); 2015 > Article
J Korean Soc Environ Eng 2015;37(12): 696-704. doi: https://doi.org/10.4491/KSEE.2015.37.12.696
젖소분뇨로부터 최대 바이오가스 생산과 유기물 제거효율을 달성하기 위한 반건식 간헐주입 연속혼합 혐기성반응조의 최적 수리학적 체류시간 도출을 위한 연구
강호1, 김선우1, 정지현1, 안희권2, 정광화3
1충남대학교 환경공학과
2충남대학교 동물자원과학부
3국립축산과학원
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 Cow Manure
Ho Kang1, Sun-Woo Kim1, Ji-Hyun Jeong1, Hee-Kwon Ahn2, Kwang-Hwa Jung3
1Department of Environmental Engineering, Chungnam National University
2Department of Animal Biosystems Science, Chungnam National University
3National Institute of Animal Science, R. D. A.
Corresponding author  Ho Kang ,Tel: 042-821-6675, Fax: 042-822-5610, Email: hokang@cnu.ac.kr
Received: December 8, 2015;  Revised: December 28, 2015;  Accepted: December 29, 2015.  Published online: December 31, 2015.
ABSTRACT
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.
Key Words: Dairy Cow Manure, Biogas, Methane, TVS Removal Efficiency, HRT (Hydraulic Retention Times)
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