Multiple dynamic Al-based floc layers on ultrafiltration membrane surfaces for humic acid and reservoir water fouling reduction

WATER RESEARCH

卷:139

Article

Ma, Baiwen¹  Li, Wenjiang^1,2  Liu, Ruiping¹  Liu, Gang³  Sun, Jingqiu^1,4  Liu, Huijuan^4,5  Qu, Jiuhui^1,4  van der Meer, Walter⁶ 

[1] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Drinking Water Sci & Technol, Beijing 100085, Peoples R China

[2] Xian Univ Architecture & Technol, Xian 710055, Shaanxi, Peoples R China

[3] Delft Univ Technol, Fac Civil Engn & Geosci, Dept Water Management, Sanit Engn, POB 5048, NL-2600 GA Delft, Netherlands

[4] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[5] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Aquat Chem, Beijing 100085, Peoples R China

[6] Univ Twente, Sci & Technol, POB 217, NL-7500 AE Enschede, Netherlands

关键词: Ultrafiltration membrane;    Al-based flocs;    Multiple dynamic layers;    Humic acid and reservoir water;    Fouling reduction;   

DOI  :  10.1016/j.watres.2018.04.012

来源: Elsevier

【 摘 要 】

The integration of adsorbents with ultrafiltration (UF) membranes is a promising method for alleviating membrane fouling and reducing land use. However, adsorbents typically are only injected into the membrane tank once, resulting in a single dynamic protection layer and low removal efficiency over long-term operation. In addition, the granular adsorbents used can cause membrane surface damage. To overcome these disadvantages, we injected inexpensive and loose aluminum (Al)-based flocs directly into a membrane tank with bottom aeration in the presence of humic acid (HA) or raw water taken from the Miyun Reservoir (Beijing, China). Results showed that the flocs were well suspended in the membrane tank, and multiple dynamic floc protection layers were formed (sandwich-like) on the membrane surface with multiple batch injections. Higher frequency floc injections resulted in better floc utilization efficiency and less severe membrane fouling. With continuous injection, acid solutions demonstrated better performance in removing HA molecules, especially those with small molecular weight, and in alleviating membrane fouling compared with the use of high aeration rate or polyacrylamide injection. This was attributed to the small particle size, large specific surface area, and high zeta potential of the flocs. Additionally, excellent UF membrane performance was exhibited by reservoir water with continuous injection and acid solution. Based on the outstanding UF membrane performance, this innovative integrated filtration with loose Al-based flocs has great application potential for water treatment. (C) 2018 Elsevier Ltd. All rights reserved.

【 授权许可】

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