The magnetic enhanced coagulation membrane filtration (MECMF) process was introduced into micro-polluted surface water treatment. The process was conducted by adding magnetic powder (MP) for enhancing coagulation. By contrasting the water quality parameters including dissolved organic carbon (DOC), UV254 and turbidity of permeates of MECMF and coagulation/flocculation membrane filtration (CFMF), results showed that the removal efficiency in the MECMF process was higher than those in the CFMF process. According to normalized flux and resistance analysis, membrane flux declined relatively slow and irreversible fouling resistance was lesser in the MECMF process. By analyzing the three-dimensional fluorescence of permeates and raw water, it was clearly shown that the permeate quality of the MECMF process was superior to that of the CFMF process apparently, which highlighted the removal of protein-like substances was more effectively in MECMF. Furthermore, the addition of MP could provide Lorentz and magnetic dipole forces between colloidal matters during coagulation, leading to the increase of collision frequency and efficiency and the formation of large size flocs with high fractal dimension. Large and high fractal dimension flocs could form a porous cake layer, which could increase water permeability. On the basic of the above findings, it was suggested that magnetic-enhanced coagulation that promoted flocs to develop could regulate cake layer structure and mitigate membrane fouling to some extent.
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Research Article|
August 08 2015
Using magnetic powder to enhance coagulation membrane filtration for treating micro-polluted surface water
Jie Wang;
1State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnology 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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Lulu Liu;
Lulu Liu
2School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, China
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Jun Yang;
Jun Yang
2School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, China
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Sasa Yang;
Sasa Yang
2School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, China
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Hongwei Zhang;
Hongwei Zhang
1State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnology University, Tianjin 300387, China
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Hui Jia;
Hui Jia
1State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnology University, Tianjin 300387, China
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Xingfei Guo
Xingfei Guo
2School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, China
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Water Supply (2016) 16 (1): 104–114.
Article history
Received:
May 21 2015
Accepted:
July 10 2015
Citation
Jie Wang, Lulu Liu, Jun Yang, Sasa Yang, Hongwei Zhang, Hui Jia, Xingfei Guo; Using magnetic powder to enhance coagulation membrane filtration for treating micro-polluted surface water. Water Supply 1 February 2016; 16 (1): 104–114. doi: https://doi.org/10.2166/ws.2015.112
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