Contribution of different effluent organic matter fractions to membrane fouling in ultrafiltration of treated domestic wastewater
Contribution of different effluent organic matter fractions to membrane fouling in ultrafiltration of treated domestic wastewater
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DOI：
10.2166/wrd.2012.021
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发表时间：
2012-12
影响因子：
2.3
通讯作者：
Xing Zheng;J. Croué
中科院分区：
文献类型：
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作者：
Xing Zheng;J. Croué
在目前的工作中，处理后的生活废水中的排出有机物（EfOM）被分离为疏水性中性物质、胶体、疏水性酸、反式亲水性酸以及中性物和亲水性化合物。确定了它们对溶解有机碳 (DOC) 的贡献。对分子大小和疏水性进行了进一步表征。将每个分离的级分加入盐溶液中，以使用亲水性聚醚砜膜来确定其在超滤（UF）中的污染潜力。结果表明，每种 EfOM 都会导致不可逆的结垢。在向膜输送的 DOC 负载相似的情况下，胶体在可逆和不可逆污染方面表现出最高的污染效应。疏水性有机物显示出比存在的生物聚合物低得多的可逆性。然而，由于它们的尺寸比膜孔开口小得多，因此它们不会像生物聚合物那样导致严重的污染。在所有分离的馏分中，亲水物质显示出最低的结垢可能性。对于胶体或疏水性物质，增加它们在给水中的含量会导致更严重的结垢。生物聚合物和其他 EfOM 组分之间的协同效应也被确定为在过滤含 EfOM 的水中导致超滤污染的机制之一。
In the present work, effluent organic matter (EfOM) in treated domestic wastewater was separated into hydrophobic neutrals, colloids, hydrophobic acids, transphilic acids and neutrals and hydrophilic compounds. Their contribution to dissolved organic carbon (DOC) was identified. Further characterization was conducted with respect to molecular size and hydrophobicity. Each isolated fraction was dosed into salt solution to identify its fouling potential in ultrafiltration (UF) using a hydrophilized polyethersulfone membrane. The results show that each kind of EfOM leads to irreversible fouling. At similar delivered DOC load to the membrane, colloids present the highest fouling effect in terms of both reversible and irreversible fouling. The hydrophobic organics show much lower reversibility than the biopolymers present. However, as they are of much smaller size than the membrane pore opening, they cannot lead to such severe fouling as biopolymers do. In all of the isolated fractions, hydrophilics show the lowest fouling potential. For either colloids or hydrophobic substances, increasing their content in feedwater leads to worse fouling. The co-effect between biopolymers and other EfOM fractions has also been identified as one of the mechanisms contributing to UF fouling in filtering EfOM-containing waters.