A mechanistic study of in situ chemical cleaning-in-place for a PTFE flat sheet membrane: fouling mitigation and membrane characterization |
| |
| Authors: | Eui-Jong Lee Pejman Hadi Dickson Y S Yan Hyung-Sook Kim |
| |
| Institution: | 1. Faculty of Science &2. Technology, School of Energy and Environment, City University of Hong Kong, Hong Kong, PR China;3. Technology, the Technological and Higher Education Institute of Hong Kong, Hong Kong, PR China;4. Department of Food and Nutrition, School of Human Ecology, The University of Suwon, Hwaseong-Si, Republic of Korea |
| |
| Abstract: | This study aimed at unfolding the role and mechanisms of chemically enhanced cleaning-in-place (CIP) regimes in fouling control of polytetrafluoroethylene (PTFE) made flat sheet (FS) membrane bio-reactors (MBRs). The trans-membrane pressure (TMP) was successfully maintained below 10 kPa using a daily CIP regime consisting of 100 to 600 mg l?1 of NaOCl and cake layer resistance control was shown to be critical for effective high-flux MBR operation. In contrast, in the control unit without the CIP, the TMP exceeded 35 kPa at a flux of 40 LMH. The extracellular polymeric substances associated with proteins (EPSprotein) were also controlled effectively with a daily application of the CIP to the fouled membrane. Moreover, the CIP prompted a thinner and looser bio-cake layer on the membrane surface, suggesting that in situ CIP can be a favorable method to control FS membrane fouling at high-flux MBR operation. |
| |
| Keywords: | Bio-cake layer cleaning-in-place extracellular polymeric substances membrane bioreactor membrane fouling |
|
|
