| Title |
Analysis of Influencing Factors in Domestic Sewage Treatment by Hanging Biological Contactor Process |
| Authors |
이수환 ; 정용 ; 권숙표 ( Soo Hwan Lee ; Yong Kwon Chung ; Sook Pyo Kwon ) |
| Abstract |
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, %) |