현수 미생물막법에 의한 하수 처리시 HBC설치량 변화에 따른 유기물 제거 효율의 변이 및 영향 인자의 조건 변화에 따른 운전상의 여러변수가 유기물 제거 효율에 미치는 영향이 어느 정도인가를 알아보기 위한 목적으로 HBC법 실험장치를 사용하여 처리에 미치는 영향을 조작한 결과는 다음과 같다. 1 하수의 체류시간과 송기량에 따른 BOD제거율은 체류시간이 12시간일때 송기량이 3ℓ/min일때가 BOD제거율 84%로 가장 좋았고 8시간일때는 송기량이 5ℓ/min일때가 75%, 4시간 일때는 송기량이 9ℓ/min일때가 73.2%로 가장 좋았다. 각 조의 적정 DO포화율은 1조가 20∼25%, 2조는 30∼35%, 3조는 37.40%, 4조는 54-60%였으며 유랑증가에 따라 송기량도 증가시켜야함을 알 수 있었다. 2. 적정 HBC양은 각조의 HBC의 길이가 4 m로 BOD제거 속도 상수(Ko)가 0.056day^(1) BOD제거율이 85.9%로 가장 좋았다. 또한 이때 유량이 0.48㎥/day, 송기량이 5ℓ/min 일때 1m에 대한 유기물 부하량은 3.04g BOD/m/day였다. 3. BOD제거 효율에 영향을 미치는 인지들을 선정하여 SPSS를 이용해 중회귀 분식(Multiple Regression Amalysis)을 실시한 결과 다음과 같은 함수 관계를 얻어낼 수 있었다. Y = 66.1 + 56.4x₁ + 0.34x₂ + 16.7x₃ - 15.6x₄ - 5.4x_5 + 0.29x_6 + 0.26x_7 - 0.24x_8 - 0.23x_9 (R^2 = 0.71, P<0.01) where; Y = EFF (Effluent BOD concentration, ㎎/ℓ) x₁ = INEL (Influent flow rate, ㎥/day) x₂ = ORLD (Influent organic loading, BODg/day) x₃ = RT (Retention time, hr) x₄ = RI (Length of HBC, m) x_5 = TEO (Influent water temperature, ℃) x_(6-9) = DO1-DO4: (DO saturation rate at stage 1-4, %)

Hanging Biological Contactor process is utilized to sewage treatment by symbiosis and food-chain mechanism with micro-organisms adhered on hanging contactor in the biological reactor. Recently this process has been widely applied to organic wastewater and domestic sewage treatment in small size with the advantages of low cost for maintenance and simple operation. This study was dealt with organic removal efficiencies owing to the operation variables, such as flowrate of influent wastewater, the length of hanging contactor, organic loading rate, and degree of dissolved oxygen saturation, and organic removal efficiency in HBC process, and the following experimental results subsequently obtained; For the upmost BOD removal efficiency with respect to the retention time and air flow rate, BOD removal efficiency showed 84% to 12 hours of retention time and 3 1/min of air flow rate, 75% to 8 hours of retention time and 5 1/min of air flow rate, and 73.2% to 4 hours of retention time 9 1/min of air flow rate. When the length of hanging contactor in the reactor was 4m of above, the upmost BOD removal efficiency was shown in 85.9% and BOD removal rate constant (Ko) 0.056day^(-1). In this case, BOD loading rate with respect to 1m of hanging contactor was 3.04 g BOD/m/day. From the Stepwise Multiple Regression Analysis for the related parameters effected on BOD removal efficiency, using SPSS, the following equation was obtained; Y = 66.1 + 56.4x₁ + 0.34x₂ + 16.7x₃ - 15.6x₄ - 5.4x_5 + 0.29x_6 + 0.26x_7 - 0.24x_8 - 0.23x_9 (R^2 = 0.71, P<0.01) where; Y = EFF (Effluent BOD concentration, ㎎/ℓ) x₁ = INEL (Influent flow rate, ㎥/day) x₂ = ORLD (Influent organic loading, BODg/day) x₃ = RT (Retention time, hr) x₄ = RI (Length of HBC, m) x_5 = TEO (Influent water temperature, ℃) x_(6-9) = DO1-DO4: (DO saturation rate at stage 1-4, %)