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CSTR 및 충전탑을 이용한 2단계 혐기성 폐수처리공정
Anaerobic Treatment of MSG Waste with CSTR and Filter
HWAHAK KONGHAK, August 1979, 17(4), 281-292(12), NONE
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Abstract
고농도의 산업폐수의 일종인 글루타민산소다 발효폐액을 재래식 혐기성 방법에서 문제가 되던 장기간 체류 시간과 공정상 불안정 문제를 해결하기 위하여 발효상 분리 연속교반 반응기-충전탑법에 의하여 처리하였다.
실험장치로는 acidogenesis를 위해 30 ℃에서 용량 40 l의 연속 교반조와 methanogenesis를 위해 38 ℃에서 31.3 l의 폴리프로필렌（1.25 ㎝ 크기의 정방형）을 충전한 충전탑을 사용하였다. 두 가지 정상상태에서의 실험은 교반조 체류시간 14시간, 충전탑 체류시간 20시간 및 교반조 16.7시간 충전탑 40시간의 체류 시간을 주었다. 이때의 부하율은 4.5 ㎏ COD/㎥/day, 2.24 ㎏ COD/㎥/day였으며 처리효율은 각각 57.4 %와 85.3 %여으며 메탄개스의 발생률은 25 ℓ/day와 15 ℓ/day였다. 이때 생긴 슬럿지 용적지수(SVI)는 18.4로 침전속도가 매우 양호하였다.
본 공정의 운전 중에 외부에서 pH 조정을 해줄 필요가 없었으며 혐기성 충전탑의 어느 부분도 메탄균의 최적 pH 6-8범위내에 있었다.
실험장치로는 acidogenesis를 위해 30 ℃에서 용량 40 l의 연속 교반조와 methanogenesis를 위해 38 ℃에서 31.3 l의 폴리프로필렌（1.25 ㎝ 크기의 정방형）을 충전한 충전탑을 사용하였다. 두 가지 정상상태에서의 실험은 교반조 체류시간 14시간, 충전탑 체류시간 20시간 및 교반조 16.7시간 충전탑 40시간의 체류 시간을 주었다. 이때의 부하율은 4.5 ㎏ COD/㎥/day, 2.24 ㎏ COD/㎥/day였으며 처리효율은 각각 57.4 %와 85.3 %여으며 메탄개스의 발생률은 25 ℓ/day와 15 ℓ/day였다. 이때 생긴 슬럿지 용적지수(SVI)는 18.4로 침전속도가 매우 양호하였다.
본 공정의 운전 중에 외부에서 pH 조정을 해줄 필요가 없었으며 혐기성 충전탑의 어느 부분도 메탄균의 최적 pH 6-8범위내에 있었다.
A CSTR-anaerobic filter process with the phase separation technique was employed in treating monosodium glutamate fermentation waste of high strength to avoid the difficulties of process instability and long hydraulic detention time in conventional anaerobic wastewater treatment.
A 40 l capacity CSTR was used for the first stage acidogenesis reaction carried out at 30 ℃ and a 31.3 l filter packed with square channel type packings of polypropylene was for the second stage methanogenesis reaction at 38 ℃.
Two sets of steady state experiments were run. The first experiment was performed with the detention time of 14 h for CSTR and 20 h for filter and the second one with the detention time of 16.7 h for CSTR and 40 h for the filter. The anaerobic filter was operated with the loading rates of 4.5 ㎏-COD/㎥/day and 2.24 ㎏/㎥/day. The treatment efficiencies were 57.4 % and 85.3 % respectively on the basis of filtrate COD. Methane production rates were 25 l/day and 15 l/day respectively. Sludge Volume Index of the over flow from the CSTR was 18.4 far less than 100. During the operation, no external pH control was required and any part of the anaerobic filter did not fail to maintain the optimum pH range from 6 to 8 for the growth of methane generating bacteria.
A 40 l capacity CSTR was used for the first stage acidogenesis reaction carried out at 30 ℃ and a 31.3 l filter packed with square channel type packings of polypropylene was for the second stage methanogenesis reaction at 38 ℃.
Two sets of steady state experiments were run. The first experiment was performed with the detention time of 14 h for CSTR and 20 h for filter and the second one with the detention time of 16.7 h for CSTR and 40 h for the filter. The anaerobic filter was operated with the loading rates of 4.5 ㎏-COD/㎥/day and 2.24 ㎏/㎥/day. The treatment efficiencies were 57.4 % and 85.3 % respectively on the basis of filtrate COD. Methane production rates were 25 l/day and 15 l/day respectively. Sludge Volume Index of the over flow from the CSTR was 18.4 far less than 100. During the operation, no external pH control was required and any part of the anaerobic filter did not fail to maintain the optimum pH range from 6 to 8 for the growth of methane generating bacteria.
