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Residual aluminum components and their contribution to nanofiltration membrane fouling in natural water

Authors： Yuan Ziyi1,2, Li Yunfei1, Li Tianyu3, Zhang Jianfeng2, Wang xiaomao2

Units： 1. State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China; 2. School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China; 3. Beijing Origin Water Membrane Technology Co., Ltd., Beijing, 102206, China

KeyWords： drinking water treatment; nanofiltration; residual aluminum; membrane fouling

ClassificationCode：TU991.2

year,volume(issue):pagination： 2021,41(6):10-17

Abstract：

Although residual aluminum has been recognized one of the key foulants contributing to nanofiltration membrane fouling in drinking water treatment, the degree to which various residual aluminum components influence membrane fouling is unknown. In this study, the species distribution of residual aluminum in the nanofiltration influent was manipulated in order to analyze the effect of residual aluminum's degree of polymerization and complexation with organic matter on membrane fouling. Results showed that even when the concentrations of medium and high polymeric aluminum (Alb/Alc) were increased to 200 μg/L, they had virtually little impact on membrane fouling, whereas the concentration of oligomeric aluminum (Ala) in the range of 50 μg/L could significantly aggravate the membrane fouling rate. In comparison to the concentration of Ala, the complex stability of Ala and natural organic matter (NOM) was shown to have a higher effect on membrane fouling. As a result, the most significant residual aluminum form that aggravated the fouling of nanofiltration membranes was thus the more stable Ala-NOM.

Funds：

国家自然科学基金项目（51978367）

AuthorIntro：

袁梓屹（1996-），男，陕西汉中人，硕士，主要研究方向为纳滤膜污染控制技术，E-mail：510793028@qq.com

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