Influence of salts, anion polyacrylamide and crude oil on nanofiltration membrane fouling during desalination process of polymer flooding produced water
Influence of salts, anion polyacrylamide and crude oil on nanofiltration membrane fouling during desalination process of polymer flooding produced water
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DOI：
10.1016/j.desal.2015.07.006
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发表时间：
2015-10
期刊：
影响因子：
9.9
通讯作者：
Ruijun Zhang;W. Shi;Shuili Yu;Wei Wang;Zhiqiang Zhang;Bing Zhang;Li Li-Li;Xian Bao
中科院分区：
文献类型：
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作者：
Ruijun Zhang;W. Shi;Shuili Yu;Wei Wang;Zhiqiang Zhang;Bing Zhang;Li Li-Li;Xian Bao
聚合物驱采油过程中产生的聚合物驱采出水的有效管理将成为亟待解决的课题。为了研究膜的污染性能，本工作采用商业纳滤膜(NF90)处理PFPW模型，以不同种类的盐、阴离子聚丙烯酰胺(APAM)和原油为目标污染物。采用AFM、SEM-EDS、ATR-FTIR和接触角等分析手段对各种膜尸检标本进行分析。结果表明，膜污染主要是由APAM引起的，其次是盐和原油。离子与APAM之间的各种相互影响，包括电荷屏蔽、络合、分子卷曲和阻垢作用，都会在不同的组合中加剧或减轻结垢。亲水性的APAM在钙的辅助作用下，通过强的氢结合和络合作用快速附着在膜表面，从而对原油起到屏蔽作用。3种靶标污染物对膜的污染可以通过加强尺寸排斥来提高盐分截留率。此外，APAM引起的Donnan效应和原油引起的非极性作用也对除盐有贡献。最后，对结垢机理进行了探讨，并提出了一些建议。
The effective management of polymer flooding produced water (PFPW), co-produced in the process of polymer flooding oil extraction, will become a subject to solve urgently. To study membrane fouling properties, a commercial NF membrane (NF90) was adopted to treat model PFPW in this work, with different kinds of salt, anion polyacrylamide (APAM) and crude oil as target foulants. AFM, SEM-EDS, ATR-FTIR and contact angle were employed to analyze various membrane autopsies. The results showed that the membrane fouling was dominantly induced by APAM, as well as salts and crude oil. Various mutual influences between ions and APAM including charge screening, complexation, molecule coiling up and anti-scaling effect would aggravate or mitigate fouling in different combinations. The hydrophilic APAM could produce a “shielding effect” against crude oil because of its rapid adhesion on membrane surface under the strong hydrogen binding and complexation assisted by calcium. Membrane fouling induced by the three target foulants could improve salt rejection by strengthening size exclusion. In addition, the Donnan effect caused by APAM and nonpolar action caused by crude oil can also contribute in salt removal. Finally, fouling mechanism was proposed and some suggestions were put forward.