| Title |
Seperation Characteristics of Domestic Sewage using Activated Sludge Process combined with Hollow Fiber Microfiltration Membrane ( ASMF ) |
| Authors |
박재로 ; 지재성 ; 김응호 ( Jae Roh Park ; Chai Sung Gee ; Eoung Ho Kim ) |
| Abstract |
The Purpose of this study is to investigate the seperation characteristics of high concentration domestic sewage using activated sludge process combined with hollow fiber microfiltration membrane and to find out the operating parameter for ASMF Process. A hollow fiber microfiltration membrane module with a pore size 0.1micron was immersed in the aeration basin(0.4㎥) and treated water was filtered through the membrane by intermittent suction with low pressure of 400mmHg(about 0.5kgf/㎠). In this experiment, various operational mode were applied to investigate stable permeate flux conditions as well as optimal suction-idle cycle and effective aeration intensity. The BOD, COD and LAS removal efficiency were higher than 85% and SS, Turbidity removal efficiency was about 100% but color removal efficiency was lower than 60%. As the results, the stable permeate flux range was 9 ℓ/ ㎡/hr∼12 ℓ/ ㎡/hr, the optimal suction-idle cycle was 10min-10min and the aeration intensity condition of 320 ℓ/㎥min was sufficient to keep both stable permeate flux and aerobic basin condition. During the experimental period, cumulating fouling and internal clogging in the membrane were inevitable to some extent. However, the optimal permeate flux, intermittent suction, and low suction pressure operation could prevent the unrecoverable fouling and dead end of operation without frequent chemical cleaning. |