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하수에서 응집제 주입률 자동제어 시스템(CAST)을 이용한 MF 분리막의 막 오염에 관한 응집 전처리 효과에 관한 연구
김원경 ( Wonkyong Kim ),성윤경 ( Yunkyong Sung ),유흥성 ( Hungsung Yoo ),박용진 ( Yongjin Park ) 한국수처리학회 2015 한국수처리학회지 Vol.23 No.4
A combined system of coagulation and membrane processes was investigated in this study for coagulation pretreatment on the fouling of microfiltration membrane in treating municipal wastewater. Coagulant dosing is traditionally based on jar-tests or operator experience, resulting in either overdosing or insufficient dosing. For reliable purity and accuracy, on-line coagulant control instrumentation is necessary. In this study, we assess the feasibility of a new coagulant dose control instrument, the online charge-based automatic titration system, charge analyzing system with titrator (CAST), to control membrane fouling in microfiltration (MF) process. This paper presents a 100 m3/d pilot for effect of coagulation pretreatment and organic matters (UV254, PO4-P) removal using a coagulation/MF process. To confirm the coagulation effect, the CAST unit was also compared with a control method where coagulants were applied at a constant rate using In-Line Mixer device. For the extension of filtration time required to reach TMP in MF process, the application of CAST unit by applying a CAST Factor can be more useful and effective for reducing CIP cycle time, and energy, water, and chemical consumption than a control unit due to the rapid and accuracy calculation of coagulant dosage.