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Discussing about critical operating flux of ultrafiltration membrane
LIU Chong, LV Xiaolong, WU Chunrui, WANG Xuan, GAO Qijun, CHEN Huayan, JIA Yue
Units: (State Key Laboratory of Separation Membranes and Membrane Processes, Institute of Biological and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387)
KeyWords: membrane fouling; critical flux; critical operating flux
year,volume(issue):pagination: 2017,37(1):23-26

 Critical flux was generally used to reflect the membrane fouling, but the pressure value corresponded critical flux was small, could not reflect the actual membrane fouling in filtrating process. According to our proposed the concept of critical operating flux, critical flux and critical operating flux were compared in this paper. Both two fluxes of the non-pulsation process, pulsation process and pulsation coupled with diatomite were investigated to discuss the case of reflecting the membrane fouling. The results showed that critical flux could show the difference of the membrane fouling state in the three process, but it was lack in the practical guiding significance because the actual membrane filtration process was done in a certain degree of cake layer. However, critical operating flux could better represent the actual state of membrane fouling in filtration process and reflect the influence of cake layer on membrane flux. Compared with critical flux, critical operating flux was sufficient in guiding significance in practical engineering applications.



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