Abstract
A two-phase UASB system was operated for high-rate treatment of concentrated distillery wastewater. The phase separation was obtained by adjusting pH in each reactor. When influent SS concentration was 4.1/g/l, the first phase UASB reactor was effectively operated up to the loading rate of 16.5kg $COD/m^3.day$, producing 3.9g HAc/l.day. In the methanogenic UASB reactor, loading rate up to 44kg $COD/m^3.day$ could be applied while removing 80% of influent COD with a specific gas production of 16.5 l/l. day. After the formation granular sludge in both reactors, it was possible to maintain the appropriate pH in the first phase only by recirculating the effluent from methanogenic phase without the addition of alkaline chemicals.
본 연구에서는 주정폐액의 고율처리를 위하여 이상 UASB 공정을 시험하였다. 상분리는 반응조의 pH를 조절하므로써 가능하였다. 유입폐수의 SS 농도가 4.1g/l일 때 산형성조는 유기부하 16.5kg $COD/m^3.day$까지 운전이 가능하였고, 이때 산생성율은 3.9g HAc/l.day를 나타내었다. 메탄형성조는 유기부하 44kg $COD/m^3.day$까지 운전이 가능하였으며, 이때 COD 제거율은 80%이었고 비가스 생성율은 16.51/l.day이었다. 두 반응조에서 입상슬러지가 형성된 이후에는 알칼리도의 주입없이 메탄조유출수의 재순환으로 산형성조의 pH를 적절하게 유지할 수 있었다.