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가압식 분리막을 이용한 Side-Stream MBR 공정의 비정상 운전조건에서 막 오염 저감 |
고병곤1, 나지훈2, 남덕현2, 강기훈2, 이채영1,3,† |
1수원대학교 토목공학과 2대림산업(주) 3하천환경기술연구소 |
Fouling Mitigation for Pressurized Membrane of Side-Stream MBR Process at Abnormal Operation Condition |
Byeong-Gon Ko1, Ji-Hun Na2, Duck-Hyun Nam2, Ki-Hoon Kang2, Chae-Young Lee1,3,† |
1Department of Civil Engineering, The University of Suwon 2Daelim Industrial Co. Ltd. 3Institute of River Environmental Technology |
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Received: March 22, 2016; Revised: April 18, 2016; Accepted: April 25, 2016. Published online: June 30, 2016. |
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ABSTRACT |
Pressurized membrane used for side-stream MBR process requires fouling control strategy both for normal and abnormal operation conditions for stable operation of the facilities. In this study, 85 m3/day of pilot-scale side-stream MBR process was constructed for the evaluation of fouling mitigation by air bubble injection into the membrane module. In addition, fouling phenomena at abnormal operation conditions of low influent and/or loading rate were also investigated. Injection of air bubble was found to be effective in delaying transmembrane pressure (TMP) increase mainly due to scouring effect on the membrane surface, resulting in expanded filtration cycle at a high flux of 40 L/m2∙h (LMH). At abnormal operation condition, injection of PACl (53 mg/L as Al) into the bioreactor showed 19% reduction of TMP increase. However, inhibition of nitrifying bacteria by continuous PACl injection was observed from batch experiments. In contrast, injection of powdered activated carbon (PAC, 0.6 g/L) was able to maintain the initial TMP of 0.2 kg/cm2 for 5 days at the abnormal conditions. It may have been caused from the adsorption of extracellular polymeric substances (EPS), which was known to be excessively released during growth inhibition condition and act as the major foulants in MBR operations. |
Key Words:
Side-Stream Membrane, Air Lift Membrane, Membrane Bio-Reactor (MBR), Fouling, Sewage Treatment |
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