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  • Volume 13, Issue 2

Evaluation of dynamic membrane formation and filtration models at constant pressure in a combined coagulation/dynamic membrane process in treating polluted river water

Chunhua Xu, Baoyu Gao, Baichuan Cao, Dandan Cheng, Qinyan Yue
Published March 2013, 13 (2) 286-293; DOI: 10.2166/ws.2013.599
Chunhua Xu
School of Environmental Science and Engineering, Shandong University, No.27 Shanda South Road, Jinan 250100, Shandong, China E-mail: bygao@sdu.edu.cn
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Baoyu Gao
School of Environmental Science and Engineering, Shandong University, No.27 Shanda South Road, Jinan 250100, Shandong, China E-mail: bygao@sdu.edu.cn
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Baichuan Cao
School of Environmental Science and Engineering, Shandong University, No.27 Shanda South Road, Jinan 250100, Shandong, China E-mail: bygao@sdu.edu.cn
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Dandan Cheng
School of Environmental Science and Engineering, Shandong University, No.27 Shanda South Road, Jinan 250100, Shandong, China E-mail: bygao@sdu.edu.cn
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Qinyan Yue
School of Environmental Science and Engineering, Shandong University, No.27 Shanda South Road, Jinan 250100, Shandong, China E-mail: bygao@sdu.edu.cn
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Abstract

In this study, a dynamic membrane (DM) was formed by flocs produced by river water pollutants reacting with polyaluminum chloride (PAC). The DM was used to separate the flocs from the mixed liquor at constant pressure. Two support media for the DM were tested: non-woven fabric filter and dacron mesh. The formation time of the DM was determined according to the critical flux. The formation process and filtration mechanisms were evaluated based on typical crossflow membrane fouling models and combinations of them. When a non-woven fabric filter was used as the support media, the formation time of the DM was 70 min at 4 cm water head drop (WHD) and 20 min at 8 cm WHD. When dacron mesh was used as the support media, the membrane formation required 100 min at 4 cm WHD and 70 min at 8 cm WHD. During DM formation on a non-woven fabric filter, the internal pore blocking plays the dominant role. But when dacron mesh is used as the support media, complete blocking and intermediate blocking dominate. After the formation of a DM, the combined models have good agreement with the experimental data compared with the typical filtration models.

  • coagulation
  • constant pressure
  • crossflow membrane fouling models
  • dynamic membrane
  • filtration
  • Received June 7, 2012.
  • Accepted September 6, 2012.
  • © IWA Publishing 2013

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Water Science and Technology: Water Supply: 18 (2)
  Volume 13, Issue 2

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Evaluation of dynamic membrane formation and filtration models at constant pressure in a combined coagulation/dynamic membrane process in treating polluted river water
Chunhua Xu, Baoyu Gao, Baichuan Cao, Dandan Cheng, Qinyan Yue
Water Science and Technology: Water Supply Mar 2013, 13 (2) 286-293; DOI: 10.2166/ws.2013.599
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Evaluation of dynamic membrane formation and filtration models at constant pressure in a combined coagulation/dynamic membrane process in treating polluted river water
Chunhua Xu, Baoyu Gao, Baichuan Cao, Dandan Cheng, Qinyan Yue
Water Science and Technology: Water Supply Mar 2013, 13 (2) 286-293; DOI: 10.2166/ws.2013.599

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Keywords

Coagulation
constant pressure
crossflow membrane fouling models
dynamic membrane
filtration
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