Efficiencies and mechanisms of chemical cleaning agents for nanofiltration membranes used in produced wastewater desalination 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Science of the Total Environment
年/卷/期
2019 / 652 /
页码
256-266
ISSN号
0048-9697
作者单位
Nanyang Normal Univ, Coll Civil Engn & Architecture, Nanyang 473061, Peoples R China;Univ Jinan, Sch Civil Engn & Architecture, Jinan 250022, Shandong, Peoples R China;Nanyang Normal Univ, Coll Civil Engn & Architecture, Nanyang 473061, Peoples R China;Guangdong Univ Technol, Sch Civil & Transportat Engn, Guangzhou 510006, Guangdong, Peoples R China;Nanyang Normal Univ, Coll Civil Engn & Architecture, Nanyang 473061, Peoples R China;Tongji Univ, Sch Environm Sci & Engn, State Key Lab Pollut Control & Resources Reuse, Shanghai 200092, Peoples R China;Univ Jinan, Sch Civil Engn & Architecture, Jinan 250022, Shandong, Peoples R China;
作者
Zhao, Dongsheng;Qiu, Liping;Song, Jiyu;Liu, Junxia;Wang, Zonghua;Zhu, Youbing;Liu, Guicai;
摘要
A spiral-wound nanofiltration (NF) membrane module harvested from a full-scale produced wastewater desalination plant was examined and cleaned to explore appropriate chemical cleaning protocols. Foulant identification and cleaning efficiency and mechanisms were investigated. For total foulants, the organic components, including anionic polyacrylamide (APAM) and crude oil, accounted for a weight percentage of 86.3%, while the remaining foulants constituted the inorganic fraction, including Na, Mg, Ca, Ba, Al, Fe and Si. Short-term cleaning experiments were designed to identify effective reagents that could be used for further evaluations of their cleaning efficiencies in long-term cleaning. For citric acid and ethylenediaminetetraacetic acid tetrasodium (EDTA-4Na), the long-term cleaning efficiencies were relatively slight or even negative, while said values varied with different surfactants. Dodecyltrimethylammonium chloride (DTAC) achieved the greatest flux recovery; conversely, cetyltrimethylammonium chloride (CTAC) provided insignificant, even negative effects, on flux recovery, as well as salt rejection, of the fouled NF membranes. FTIR and zeta potential analyses of the fouled membranes indicated that all the tested surfactants were identically effective in removing the foulants from the membrane surface, but their cleaning efficiencies differed. Moreover, a strong correlation between the flux ratio (S-f) and concentration of surfactant in the permeate (C-ps) was observed. Among the tested chemical reagents, DTAC yielded the highest C-ps and the greatest flux recovery, with an S-f of 2.25. Considering this correlation and the characteristics of the fouled membranes and surfactants, it is proposed that DTAC molecules penetrated the membrane pores and removed the foulants that were attached to the pore walls. (C) 2018 Elsevier B.V. All rights reserved.
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关键词/主题词
Produced wastewater;Nanofiltration membrane;Chemical cleaning;Membrane-pore cleaning;Surfactant monomer molecules;
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