원생동물을 이용한 하수처리장의 수질 예측 = Protozoa as an Indicator of Activated In Sludge Plant Effluent Quality

국문 초록 (Abstract)

Pilot Plant에서 도시하수가 처리되는 경우와 전처리 된 분뉴가 하수에 섞여 처리되는 두가지 종류의 하수를 표준 활성슬러지 공법으로 처리하면서 매주 2회씩 시료채집하여 원생동물의 종류 및 개체수와 처리수질을 조사하였다. 우점원생동물은 두 경우 모두 섬모충류였으며, 섬모층류, 편모충류와 아메바의 분포비가 높았다. 처리수질과 원생동물의 상관분석에서는 도시하수의 경우 양의 상관관계가 높게 나타난 경우가 많으며, 전처리 된 분뇨가 섞여 유입되는 경우는 음의 상관관계를 나타내는 경우가 다소 많았다. 회귀분석 결과, Pilot Plant A의 경우는 BOD = 4.490 × 10 exp (-4) × Total + 5.772 × 10 exp (-3) × Amoeba + 1.892 (Adjusted R^2=0.995)이며, Pilot Plant B는 BOD = 6.731 × 10 exp (-2) × Bodo + 0.306 (Adjusted R^2=0.864)의 회귀식을 얻었다. 저수온에서는 원생동물수가 35%로 줄어들며 Aspidisca속이 가장 많았다. 그러므로 원생동물은 하수처리장 유출수의 수질을 예측하는 지표로서 이용이 가능하다고 사료된다.

다국어 초록 (Multilingual Abstract)

Genera and number of protozoa were investigated in the conventional activated sludge pilot plant used for the treatment of municipal sewage and pre-treated night soil-containing sewage. In both cases, the predominant protozoa was ciliates and among them, Vorticella was the most common. In the pilot plant where pre-treated night soil was mixed with municipal sewage, genera of free-swimming ciliates, flagellates and amoeba was higher than in those without night soil. Correlation analysis on the quality of effluent and protozoa indicates that municipal sewage has positive correlation with protozoa. However, in the pilot plant of sewage containing pre-treated night soil more samples show negative correlation. Followed equations were derived by the regression analysis of BOD in both the pilot plants. In case of pilot plant A of municipal sewage, the analysis of BOD showed 4.490 × 10 exp (-4) × Total + 5.772 × 10 exp (-3) × Amoeba + 1.892 (Adjusted R^2=0.995) and in case of pilot plant B of municipal and pre-treated night soil-containing sewage, the analysis of BOD was 6.731 × 10 exp (-2) × Bodo + 0.306 (Adjusted R^2=0.864). At low temperature, number of protozoa was decreased to 35% and among them, Aspidisca was the most common genus. Therefore, protozoa can be used as indicator of quality of the effluent in sewage treatment plants.