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혐기성 선택조가 결합된 순산소 활성슬러지 공정의 고지재생 폐수처리 및 슬러지 침전 특성

Paper Regeneration Wastewater Treatment and Sludge Settling Characteristis of Anaerobic Selector Coupled Pure Oxygen Activated Sludge Process

김동진^† 이수철

Dong-Jin Kim^† Soo-Choul Lee

한림대학교 환경학과

Department of Environmental Science, Hallym University, Korea

HWAHAK KONGHAK, August 2000, 38(4), 560-566(7), NONE

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Abstract

기존 활성슬러지 폐수처리시설의 유기물 부하나 수리학적 부하가 증가될 경우 이를 적절하게 처리하기 위해 기존 처리 시설을 증설하거나 개조할 필요가 있다. 경제적인 개선 방법의 하나로 혐기성 선택조가 결합된 순산소 활성슬러지법(AS-POAS)을 개발하여 고지재생 폐수처리에 적용하였다. 순산소 반응기는 유기물 처리를 위해, 선택조는 침전조에서의 슬러지 침전성을 향상시키기 위하여 각각 도입되었다. 이러한 AS-POAS는 COD 부하 0.4-3.4 kg/m³·day 범위에서 평균 74%의 제거율을 보였다. 선택조에서는 평균 5.9 kg/m³·day의 COD를 제거하여 단위부피당 COD 제거속도가 순산소 반응기에 비해 약 4.5배 높았다. 선택조에서 유기물/미생물비(F/M비)가 높게 유지되면서 플럭형성 미생물이 우점종이 될 수 있는 조건을 만들어 주었으며 이로 인해 슬러지 침전성이 높게 유지되었다. 슬러지 침전성은 pH가 6 이상으로 유지될 경우 SVI 값이 100 이하로 유지되어 매우 우수한 슬러지 침전성을 나타내었다.

When organic and hydraulic loads exceed the treatment capacity, the existing activated sludge wastevater treatment plants are need to be expanded or retrofitted to meet the regulation. Laboratory scale anaerobic selector coupled pure oxygen activated sludge(AS-POAS)was developed to treat paper regeneration wastewater economically as one of the alternatives of the plant modification. Pure oxygen bioreactor and anaerobic selector were introduced to improve the treatability of organic load and sludge settling property, respectively. The AS-POAS showed 74% average COD removal ratio at the range of 0.4-3.4 kg COD/m³·day, In the selector COD removal rate was 5.9 kg/m³·day which is about 4.5 times of pure oxygen bioreactor. The selector provided the floc forming bacteria as the dominant microorganisms and accelerate sludge settling characteristics. SVI value was kept less than 100 and showed high sludge settling properties when pH was controlled higher than 6.

Keywords

Activated Sludge Anaerobic Paper Wastewater Pure Oxygen Sludge Settling

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