| Title |
A Study on Wastwater Treatment by the Deep Shaft Activated Sludge Process |
| Authors |
이헌모 ; 정병곤 ; 양병수 ( Heun Mo Lee ; Byung Gon Jeong ; Byung Soo Yang ) |
| Abstract |
This study was conducted to evaluate the treatment efficiency of synthetic wastewater by using both deep shaft activated sludge process and conventional activated sludge process without cellular recycle. Some results from this study were summarized as follows; Oxygen transfer efficiency in deep shaft aeration system can be changed in accordance with the depth of the deep shaft. However optimum superficial gas velocity seems to be less than 48.8 m/hr in superficial liquid velocity of 1,380m/hr when considering the power required for recycling mixed-liquid. The deep shaft unit performs better substrate removal efficiency than the activated sludge process in the range of hydraulic detention time from 0.8 days to 1.84 days. In case of the deep shaft unit, the values of the kinetic constant, Y, Kd, k and Ks were found to be 0.358, 0.227/day, 13.33/day and 333.0 ㎎/ℓ, respectively and the kinetics at the activated sludge process were 0.505, 0.137/day, 5.560/day and 285.8 ㎎/ℓ, respectively. Solid-liquid separation just with air dissolved at the hydraulic pressure at the bottom of the deep shaft tube could be done so well, and additional air dissolution seemed to be not required for this purpose. |