Irreversible membrane fouling caused by free TEP: Mitigation performance and mechanism of the integrated MIEX/UF process
Irreversible membrane fouling caused by free TEP: Mitigation performance and mechanism of the integrated MIEX/UF process
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DOI：
10.1016/j.jwpe.2023.103919
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发表时间：
2023-08
影响因子：
7
通讯作者：
Zhaohui Zhang;Tong Zhang;Liang Wang;Mengmeng Chen;Bin Zhao;Junjing Li;Cong Ma;Xiuru Chu
中科院分区：
文献类型：
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作者：
Zhaohui Zhang;Tong Zhang;Liang Wang;Mengmeng Chen;Bin Zhao;Junjing Li;Cong Ma;Xiuru Chu
自由透明胞外聚合物颗粒(TEP)是TEP的一种重要类型。研究人员已经认识到，在处理富含藻类的水时，游离TEP对不可逆膜污染的重要贡献。构建合理的工艺，有效地减缓游离态TEP对膜的污染，是超滤含藻水的必要条件。实验表明，磁性阴离子交换树脂(MIEX)/超滤(UF)组合工艺能有效地抑制游离TEP引起的不可逆膜污染。与独立超滤相比，经过多周期过滤后，MIEX/UF过程中水力和化学不可逆污垢的增长率分别降低了40%和21%。用原子力显微镜测定了游离TEP与聚偏氟乙烯(PVDF)/MIEX的界面作用力，结果表明，不含MIEX的TEP的界面作用力是不含PVDF的TEP的4.3倍。虽然MIEX对游离TEP的吸附部分减少了MIEX/UF过程中的膜污染，但MIEX动态层对MIEX/UF过程中不可逆膜污染的缓解作用最大。我们的实验结果为有效控制TEP引起的不可逆膜污染提供了更可行的工艺设计。
Free transparent exopolymer particles (TEP) are an important type of TEP. Researchers have recognized the significant contribution of free TEP to irreversible membrane fouling when treating algae-laden water. Constructing a reasonable process to effectively decelerate membrane fouling caused by free TEP is necessary for the ultrafiltration of algae-laden water. Our experiments indicate that the integrated process of magnetic anion exchange resin (MIEX)/ultrafiltration (UF) can effectively impede the irreversible membrane fouling caused by free TEP. Compared with independent UF, after multi-cycle filtration, the growth rate of hydraulically and chemically irreversible fouling decreased by 40 % and 21 %, respectively, during the MIEX/UF process. The interfacial forces between free TEP and polyvinylidene fluoride (PVDF)/MIEX were determined using atomic force microscopy, and the results showed that the interfacial force of MIEX–free TEP was 4.3-fold higher than that of PVDF–free TEP. Although the adsorption of free TEP by MIEX partly reduced membrane fouling during the MIEX/UF process, the MIEX dynamic layer contributed the most to the alleviation of irreversible membrane fouling during MIEX/UF. Our experimental results provide a more feasible process design for effectively controlling the TEP-induced irreversible membrane fouling.