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중공사 정밀여과막 활성슬러지법 ( ASMF ) 에 의한 생활하수의 분리특성에 관한 기초연구
박재로,지재성,김응호 ( Jae Roh Park,Chai Sung Gee,Eoung Ho Kim ) 한국물환경학회 1997 한국물환경학회지 Vol.13 No.2
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.
이현동,정원식,지재성 ( Hyun Dong Lee,Won Sik Chung,Chai Sung Gee ) 한국물환경학회 1998 한국물환경학회지 Vol.14 No.1
Water quality in water distribution system is changed biological, physicochemical and organoleptic qualities, and then it has been more worse. Chlorine residual was used to as indicator for prediction of water quality behavior, characteristics and ensurement of regulatory requirment. Therefore, M&O of chlorine residual is to be important for water quality management in water distribution system. This study was performed to study the relationship for water quality changes and characteristic of chlorine residual decay according to pipe type and diameter, hydraulic effect, and water quality parameter. Results of this study indicated decay coefficient of chlorine residual was to characterized with pipe type and diameter. Also it was to different hydraulic effect and initial chlorine residual concentration and water quality parameter as temperature, TOC, etc.