New insights into membrane fouling in coagulation-ultrafiltration by cake characteristics analysis: A case study with PACl-Al13 and PACl

被引：0
作者：
Xu M. [1 ]
Ju W. [2 ]
Wang Z. [1 ]
Nan J. [3 ]
Qi F. [1 ]
Li C. [1 ]
Liu Y. [1 ]
Li W. [4 ]
Sun D. [1 ]
机构：
[1] Beijing Key Lab for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, Beijing
[2] Beijing Forestry University Science Co., Ltd., Beijing
[3] Skate Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin
[4] Research Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan
来源：
Journal of Environmental Sciences (China) | 2024年 / 146卷
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
Cake characteristics; Coagultion-ultrafiltration; Floc properties; Membrane fouling; Molecular weight of HA;
D O I：
10.1016/j.jes.2023.07.030
中图分类号：
学科分类号：
摘要：
Membrane fouling is a bottleneck issue that hindered the further application of ultrafiltration technology. To alleviate membrane fouling, coagulation-ultrafiltration (C-UF) process using polyaluminum chloride (PACl) and PACl-Al13 with high proportion of Al13O4(OH)247+ as coagulants, respectively, were investigated at various pH conditions. Results indicated that an increase in solution pH contributed to larger floc size and looser floc structure for both PACl and PACl-Al13. It was conducive to the formation of more porous cake, as evidenced by mean pore area and pore area distribution of cake, leading to lower reversible fouling. Furthermore, humic acid (HA) removal presented a trend of first increasing and then decreasing with the increase of pH. The optimal HA removal was achieved at pH 6 regardless of coagulant type, suggesting that the slightest irreversible fouling should be occurred at this point. Interestingly, the irreversible fouling with PACl coagulant achieved a minimum value at pH 9, while the minimal irreversible fouling with PACl-Al13 was observed at pH 6. We speculated that the cake formed by PACl could further intercept HA prior to UF process at alkaline pH. Furthermore, compared with PACl, PACl-Al13 had a stronger charge neutralization ability, thus contributing to more compact floc structure and higher HA removal at various pH conditions. By UF fractionation measurement, higher HA removal for PACl-Al13 was due to higher removal of HA with molecular weight less than 50 kDa. © 2023
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页码：217 / 225
页数：8
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