Study on the cross-flow ultrafiltration of mixtures of macromolecular organic and inorganic salts

结垢 超滤(肾) 化学 膜污染 有机质 离子 价(化学) 无机化学 化学工程 高分子 色谱法 有机化学 生物化学 工程类
作者
Tingting Xu,Jié Song,Guangli Xiu
出处
期刊:Water Science and Technology [Pergamon Press]
卷期号:85 (6): 1754-1764 被引量:1
标识
DOI:10.2166/wst.2022.066
摘要

Ultrafiltration (UF) has been widely applied to water treatment in the past few decades, but severe membrane fouling is one of the most significant obstacles for its further development. In reality, the constituents of feed water are complex, and the fouling behavior could be different from that induced by a single foulant. In this study, the membrane fouling induced by mixed organic foulant (sodium alginate, SA) and inorganic ions under various conditions were investigated. The effects of ion concentration and valence on the combined fouling as well as the rejection performance were examined. The results showed that compared to SA alone, the presence of inorganic ions could aggravate the organic fouling of UF membranes significantly. The fouling became more severe as the ion concentration increased. Also, ions with higher valence tended to exacerbate the fouling compared with monovalent ions. It was also found that the existence of inorganic ions had negligible effects on the rejection of organic molecules, however, the rejection of salts can be improved because of the organic matter. In addition, the analysis of the classic fouling models showed that the complete blocking model is the main fouling mechanism of the mixed SA and inorganic salts.
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