膜污染
结垢
化学
超滤(肾)
膜
吸附
化学工程
水处理
过滤(数学)
色谱法
环境工程
环境科学
有机化学
生物化学
统计
数学
工程类
作者
Xiaowei Liu,Peng Chen,Xiangdong Liu,Jing Zhong,Kexin Li,Miaomiao Ye,Lili Wang
标识
DOI:10.1016/j.seppur.2023.125792
摘要
The widespread implementation of ultrafiltration (UF) technology, which has gained popularity for drinking-water treatment, has been impeded by rising operational costs and shortened membrane lifespans resulting from membrane fouling. Here, an integrated pretreatment technique combining oxidation, adsorption, and coagulation was developed using the S(IV)–Fe(II) binary activated permanganate (PM) system, S(IV)–Fe(II)/PM. The efficacy of S(IV)–Fe(II)/PM pretreatment in mitigating UF membrane fouling was investigated for various raw-water sources, including lakes, rivers, and seawater. The operational parameters of S(IV)–Fe(II)/PM pretreatment were optimized, and the underlying mechanisms for fouling alleviation were explored. Relative to conventional pretreatment methods, S(IV)–Fe(II)/PM pretreatment reduced reversible-fouling-induced resistance by 13%–92% and irreversible-fouling-induced resistance by 11%–86%. The S(IV)–Fe(II)/PM system exhibited optimal mitigation of membrane fouling at a PM:S(IV):Fe(II) dosage ratio of 2:3:3, with Grapid × Trapid = 45948, Gslow × Tslow = 12480, and a settling time of 30 min (where G is the velocity gradient and T is contact time). The effectiveness of S(IV)–Fe(II)/PM pretreatment in controlling UF membrane fouling can be attributed to the following mechanisms: 1) modification of feed water quality in terms of organic compound characteristics and concentration, colloidal particle quantity and size distribution, and microbial activity and quantity; and 2) adjustment of the membrane surface deposition environment, resulting in reduced polysaccharide and protein content, particle distribution, and biomass, as well as alterations in physicochemical properties such as hydrophilicity and interfacial free energy. This study highlights the efficacy of S(IV)–Fe(II)/PM pretreatment in ensuring high-quality UF effluent while effectively reducing membrane fouling, and its potential for alleviating membrane fouling.
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