Recycling flocculation membrane filtration (RF-MF) and coagulation membrane filtration (C-MF) were investigated for removal of natural organic matter (NOM) from Luan river in this study. The effectiveness of recycling flocculation pretreatment on both NOM removal and membrane filtration were assessed under different concentrations of coagulant and reflux flocs. Under the conditions of coagulant dosage of 6 mg/L and reflux flocs of 10 mg/L, the removal of dissolved organic carbon (DOC) was 48.4 and 48.2% by coagulation and membrane filtration, respectively. Compared to C-MF, floc recycling benefited the removal of DOC in the coagulation stage. A unified membrane filtration index (UMFI) was used to analyze the membrane fouling, and it was observed that the lowest value was 0.0004 m2/L at 6 mg/L coagulant and 10 mg/L reflux flocs. According to the results of NOM removal and membrane fouling, it can be concluded that DOC was the main reason for membrane fouling. In addition, the RF-MF contributed to small flocs aggregating into larger flocs with a denser structure. The maximal values of average floc size and the fractal dimension were 588.42 μm and 1.356, under the combination of 6 mg/L coagulant and 10 mg/L reflux flocs.
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November 2013
This article was originally published in
Journal of Water Supply: Research and Technology-Aqua
Article Contents
Research Article|
August 27 2013
Effects of recycling flocculation membrane filtration on drinking water treatment
Jie Wang;
1State Key Laboratory of Hollow Fiber Membrane Materials and Processes, Tianjin Polytechnic University, Tianjin 300387, China
2School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, China
E-mail: wangjie@tjpu.edu.cn
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Wenjin Liu;
Wenjin Liu
2School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, China
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Hui Jia;
Hui Jia
1State Key Laboratory of Hollow Fiber Membrane Materials and Processes, Tianjin Polytechnic University, Tianjin 300387, China
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Hongwei Zhang
Hongwei Zhang
1State Key Laboratory of Hollow Fiber Membrane Materials and Processes, Tianjin Polytechnic University, Tianjin 300387, China
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Journal of Water Supply: Research and Technology-Aqua (2013) 62 (7): 433–441.
Article history
Received:
March 16 2013
Accepted:
June 25 2013
Citation
Jie Wang, Wenjin Liu, Hui Jia, Hongwei Zhang; Effects of recycling flocculation membrane filtration on drinking water treatment. Journal of Water Supply: Research and Technology-Aqua 1 November 2013; 62 (7): 433–441. doi: https://doi.org/10.2166/aqua.2013.062
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