$\underline{Humicola}$ sp. was known to have several good characteristics in wastewater treatment such as rapid growth rate, good settlability, broad spectrum of utiliazble substrate, and broad pH range to grow. An activated sludge process in conjunction with an Humicola sp. cultivation reactor was tried to treat rapidly with high feed rate artificial sewage and rice-washed water as main domestic sewage which are high TOC, nitrogen and phosphorus concentration using mean cell residence time (MCRT) as a control parameter.
Dilution rate of the first reactor with Humicola sp. as 0.18/hour and of the second reactor with activated sludge 1.13/hours which are three or four times higher than that of conventional system.
With artificial sewage MCRT's of the system to achieve maximum treatment of TOC, nitrogen and phosphorus was found to be 8 days in the first stage and 10 days in the second stage and treatment efficiency were 80%, 69% and 82%, respectively.
With rice-washed water at the above MCRT's of the system TOC, nitrogen and phosphorus removal efficiency were 90%, 65%, and 70%.
Settling characteristic was relatively acceptable above 6.5 days of MCRT of each reactor and was good above 10 days of MCRT with artificial sewage.
In treatment of rice-washed water settlability of each reactor was very good any bulking phenomenon was not appeared during experiment.
In conclusion, high starcheous wastewater may be treated by this system further efficiently without any undesirable phemonena.
본 실험에서는 활성오니조와 Humicola sp. 배양조를 연속적으로 이용해 매우 높은 유기물 함량을 갖는 인공폐수와 가정용 폐수로서 쌀뜬물을MCRT 에 의한 제어를 통해 매우 빠른 속도로 처리하고 평가하였다.
서로 다른MCRT 값 (3, 7, 10, 14, 18일)을 택해 인공폐수로서 실험한 결과 1차 처리조인Humicola 배양조의 값을 8일로 하고, 2차 활성오니조의 값을 10일로 함이 최적처리조건이라고 판단되었으며, 그때의 처리 효율은 질소 69%, 인산 82%였다.
또한 위의MCRT 값으로 가정용 폐수의 처리를 평형조건에 도달한후 6일간 조사했을때, 처리효율은 평균적으로TOC 90%, 질소 65%, 인산 70%였으며 이 값들은 보통의 활성오니버에 의한 처리 효율 (COD 90--95%, 질소 50%, 인산 30%)보다 부영양화 (eutrophication)에 영향을 주는 인, 질소처리에 큰 효과를 보였다.
어떠한 bulking 현상도 가정용 폐수의 처리에선 보이지 않았으며 2차활성 오니조는Humicola sp. 에 의해 낮추어진 유출폐수의 pH 를 다시 올려주는 효과를 보였다.
