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天然水背景下残余铝组分分析及其对纳滤膜污染的贡献

作者：袁梓屹¹，²，李芸妃²，李天玉³，张建锋¹，王小亻毛 ²

单位： 1.西安建筑科技大学环境与市政工程学院，西安 710055；2.清华大学环境学院，环境模拟与污染控制国家重点联合实验室，北京 100084； 3.北京碧水源膜科技股份有限公司，北京 102206

关键词：饮用水处理；纳滤；残余铝；膜污染

DOI号：

分类号： TU991.2

出版年,卷(期):页码： 2021,41(6):10-17

摘要：

残余铝虽然已被广泛证实是造成饮用水处理纳滤膜污染加剧的关键污染物之一，但是到目前为止，尚不清楚残余铝中各组分对纳滤膜污染的影响规律和贡献率。本研究根据残余铝的产生机理，在不扰动实际水体初始状态的前提下，有效调控了纳滤进水中残余铝的种类分布，从残余铝的聚合度及其与有机物的络合程度两个方面对膜污染进行分析。结果显示，中高聚态铝（Alb/Alc）的浓度即使在200 μg/L的浓度条件下，也不会对膜污染速率产生明显影响，而低聚态铝（Ala）在50 μg/L的浓度范围内就能显著加剧膜污染。相比于Ala的浓度，Ala与天然有机物（NOM）的络合稳定性对膜污染的影响更为显著。所以，络合稳定性较高的Ala-NOM是造成纳滤膜污染加剧最关键的残余铝形态。

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.

基金项目：

国家自然科学基金项目（51978367）

作者简介：

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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