Influence of the characteristics of natural organic matter on the fouling of microfiltration membranes
Influence of the characteristics of natural organic matter on the fouling of microfiltration membranes
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DOI：
10.1016/s0043-1354(01)00183-x
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发表时间：
2001-12-01
期刊：
影响因子：
12.8
通讯作者：
Booker, NA
中科院分区：
文献类型：
--
作者：
Fan, LH;Harris, JL;Booker, NA
天然有机物（NOM）在饮用水处理过程中的微滤膜污染中起着重要的作用，即使NOM仅在很小程度上被保留。本研究的目的是更好地了解NOM和微滤膜的组分之间的相互作用。使用0.22 μ m疏水性和亲水性聚偏氟乙烯（PVDF）膜在搅拌细胞系统上的NOM从三个澳大利亚表面沃茨分离进行过滤实验。正如预期的那样，疏水膜的结垢速率显著大于亲水膜。聚焦于疏水膜，表明NOM的高分子量部分（> 30 kDa）是造成主要通量下降的原因。采用非功能化树脂和阴离子树脂对NOM的疏水性和电荷性分离的4个级分进行过滤试验，结果表明3种沃茨的结垢潜力为亲水中性>疏水酸>转亲酸>亲水带电。低芳香亲水性中性化合物是通量下降的速率和程度的主要决定因素。这与胶体尺寸级分（> 30 kDa）和导致有机物-Ca 2+桥接的级分中钙的选择性浓度有关。NOM的芳香度越高，通量下降越大，芳香族化合物主要存在于疏水酸组分中。总体而言，控制通量下降的污染机制涉及膜内部孔结构中亲水性中性部分的吸附性和胶体污染的综合影响。(C)2001爱思唯尔科技有限公司版权所有。
Natural organic matter (NOM) plays a significant role in fouling microfiltration membranes in drinking water treatment processes even though the NOM is retained only to a small extent. The aim of this study was to obtain a better understanding of the interactions between the fractional components of NOM and microfiltration membranes. Filtration experiments were performed using 0.22 mum hydrophobic and hydrophilic polyvinylidene fluoride (PVDF) membranes in a stirred-cell system on the NOM isolated from three Australian surface waters. As expected, the fouling rate for the hydrophobic membrane was considerably greater than for the hydrophilic membrane. Focusing on the hydrophobic membrane, it was shown that the high molecular weight fraction of NOM (> 30 kDa) was responsible for the major flux decline. Filtration tests on the four fractions of NOM isolated on the basis of hydrophobicity and charge using non-functionalised and anionic resins revealed that the fouling potential for the three waters was hydrophilic neutral > hydrophobic acids > transphilic acids > hydrophilic charged. The low-aromatic hydrophilic neutral compounds were the main determinant of the rate and extent of flux decline. This was linked to the colloidal size fraction (> 30 kDa) and to the selective concentration of calcium in the fraction leading to organics-Ca2+ bridging. It was also shown that the higher the aromaticity of the NOM the greater the flux decline, and the aromatics mainly resided in the hydrophobic acids fraction. Overall, the fouling mechanism controlling the flux decline involved the combined effects of adsorptive and colloidal fouling by the hydrophilic neutral fraction in the internal pore structure of the membrane. (C) 2001 Elsevier Science Ltd. All rights reserved.