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首页> 外文期刊>Science of the total environment >New insights into effect of alkaline cleaning on fouling behavior of polyamide nanofiltration membrane for wastewater treatment
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New insights into effect of alkaline cleaning on fouling behavior of polyamide nanofiltration membrane for wastewater treatment

机译：新洞察碱性清洁对纳米滤膜结垢行为进行废水处理的影响

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摘要

Membrane fouling is an intractable issue in wastewater treatment by nanofiltration (NF) membrane, and alkaline cleaning is the most effective approach to remove organic fouling on NF membrane. However, it was found that pore swelling of NF membrane induced by alkaline cleaning might reduce cleaning efficiency, and it is never quantified and its effect on membrane fouling behavior is still mysterious. In this work, membrane pore swelling effect (-9.7%, increment of effective pore size) induced by alkaline cleaning (pH 11) is confirmed and its effect on fouling behavior of the polyamide NF membrane is investigated based on experimental and modelling results. It is found that the alkali-induced pore swelling phenomenon would disappear after water filtration at neutral pH for 30 min, and if such cleaned membrane is faced by the small foulants during this pore shrinkage period, the concentration polarization and membrane fouling would be severer, and the subsequent alkaline cleaning is less effective because more foulants enter the enlarged pores and are tightly embedded in the membrane. Thus, the irreversible fouling of the NF membrane increases from 20% to 40% while its permeability recovery declines from 100% to 67% after six fouling/cleaning cycles. When an anionic surfactant sodium dodecyl sulfate (SDS, 10 mM) is added in the alkaline cleaning solution, the adsorption of SDS in/on the membrane can not only improve its hydrophilicity and negative charge, but also quickly eliminate the alkali-induced pore swelling effect and avoid the accumulation of foulants in the pores, thereby enhancing the antifouling performance of the NF membrane. Using the alkaline SDS cleaning, the irreversible fouling of the NF membrane maintains below 10% while its permeability recovery keeps above 100% in six continuous fouling/cleaning cycles.
机译：膜污染是纳滤（NF）膜处理废水处理的难以应变问题，碱性清洁是去除NF膜上有机污垢的最有效的方法。然而，发现通过碱性清洁诱导的NF膜的孔隙肿胀可能会降低清洁效率，并且永远不会量化，其对膜污垢行为的影响仍然是神秘的。在这项工作中，证实了通过碱性清洁（pH11）诱导的膜孔隙效应（-9.7％，有效孔径增量），并研究了基于实验和建模结果的聚酰胺NF膜的污垢行为的影响。发现碱诱导的孔肿胀现象在中性pH下的水过滤后将消失30分钟，如果在这种孔收缩期间，小污垢纸张面临这种清洁膜，则浓度极化和膜污垢将是严重的，随后的碱性清洁不太有效，因为更多的污垢进入扩大的孔隙并紧紧地嵌入膜中。因此，NF膜的不可逆污染从20％增加到40％，而在六个污垢/清洁循环后，其渗透率恢复在100％至67％下降。当在碱性清洁溶液中加入阴离子表面活性剂十二烷基硫酸钠（SDS，10mM）时，SDS在膜上的吸附不能改善其亲水性和负电荷，而且还可以迅速消除碱诱导的孔隙肿胀效果并避免孔中污垢的积累，从而提高NF膜的防污性能。使用碱性SDS清洁，NF膜的不可逆污垢在六连续污染/清洁循环中保持低于10％的10％，而其渗透率恢复保持在100％以上。

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  • 来源
    《Science of the total environment》 |2021年第1期|146632.1-146632.11|共11页
  • 作者

    Jiachen Huang; Jianquan Luo; Xiangrong Chen; Shichao Feng; Yinhua Wan;

  • 作者单位

    State Key Laboratory of Biochemical Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China School of Chemical Engineering University of Chinese Academy of Sciences Beijing 100049 PR China;

    State Key Laboratory of Biochemical Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China School of Chemical Engineering University of Chinese Academy of Sciences Beijing 100049 PR China;

    State Key Laboratory of Biochemical Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China School of Chemical Engineering University of Chinese Academy of Sciences Beijing 100049 PR China;

    State Key Laboratory of Biochemical Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China School of Chemical Engineering University of Chinese Academy of Sciences Beijing 100049 PR China;

    State Key Laboratory of Biochemical Engineering Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China School of Chemical Engineering University of Chinese Academy of Sciences Beijing 100049 PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Nanofiltration; Wastewater treatment; Chemical cleaning; Membrane fouling; Pore swelling;

    机译：纳滤;废水处理;化学清洗;膜污垢;毛孔肿胀;

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