Investigation of combined fouling behavior in nano-filtration process under various feed conditions
Investigation of combined fouling behavior in nano-filtration process under various feed conditions
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不同进料条件下纳滤过程中组合污垢行为的研究
DOI：
10.1080/01496395.2015.1117104
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发表时间：
2016-02
影响因子：
2.8
通讯作者：
Zhao Yu
中科院分区：
文献类型：
--
作者：
Xia Shengji;Wan Yukun;Li Nana;Zhao Yu
摘要尽管纳米过滤（NF）工艺在各种应用中取得了很大的进展，但其在水处理中的性能仍然受到不希望的污垢现象的阻碍，这一现象目前尚未完全了解。在这项研究中，污垢的行为，更具体地说，组合污垢的行为与一种以上类型的污垢的存在下，在各种溶液化学和进料液压进行了全面的调查。模型有机污垢（海藻酸盐）和无机污垢（二氧化硅胶体）之间的相互作用进行了系统的研究与纳滤膜，与更严重的污染观察到的组合污垢比单独的污垢。然而，结果还表明，正渗透过程中常见的组合污垢协同效应在纳米过滤过程中并不存在。此外，溶液化学成分（pH值和钙离子）和进水压力对膜污染也有一定的影响，尤其是进水压力对膜通量下降的影响更为显著，对膜污染的可逆性影响更大。
ABSTRACT Despite the great advance in nano-filtration (NF) process development in various applications, its performance in water treatment is still impeded by the undesired fouling phenomenon, which is not yet fully understood nowadays. In this study, a comprehensive investigation on the fouling behavior, more specifically the combined fouling behavior with the presence of more than one type of foulant was carried out under various solution chemistries and feed hydraulic pressures. The interaction between the model organic foulant (alginate) and inorganic foulant (silica colloid) was systematically studied with nano-filtration membranes, with a more severe fouling observed in the combined fouling than individual foulants. However, the results also revealed that the commonly observed synergistic effect of combined fouling in the forward osmosis process was not present in the nano-filtration process. In addition, the solution chemistries (pH and calcium ions) and feed hydraulic pressure were also found to have certain influence on the combined fouling, especially the feed hydraulic pressure which exhibited a more pronounced impact on the flux decline than the other factors, thus in turn, affecting more on the reversibility of the membrane fouling.
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