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首页> 外文期刊>Desalination: The International Journal on the Science and Technology of Desalting and Water Purification >Fouling characteristics of wastewater effluent organic matter (EfOM) isolates on NF and UF membranes
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Fouling characteristics of wastewater effluent organic matter (EfOM) isolates on NF and UF membranes

机译：NF和UF膜上的废水流出物有机物（EfOM）分离物的结垢特性

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摘要

Wastewater effluent organic matter (EfOM) was isolated into different fractions including colloids, and hydrophobic (HPO) and transphilic (TPI) fractions. The EfOM isolates were characterized by different techniques, for example, size exclusion chromatography (SEC) with on-line UVA and DOC detectors. Fourier transorm infrared (FTIR), specific UVA (SUVA), and total sugars analysis. The colloidal fraction is primarily composed of polysaccharides, proteins, and/or aminosugars, providing a hydrophilic character. The HPO and TPI fractions possessed characteristics of humic substances, i.e. high aromaticity and carboxylic functional groups. A superimposition of the EfOM isolates reflects characteristics of bulk wastewater effluents, consisting of refractory natural organic matter (NOM) conveyed from the drinking water source and soluble microbial products (SMP) derived organic matter (NOM) conveyed from the drinking water source and soluble microbial products (SMP) derived during biological processes of wastewater treatment. Each EfOM isolate exhibited different characteristics in fouling of NF and UF membranes due to their distinct characters. The colloidal fraction showed high flux decline and fouling on NF and UF membranes primarily due to the effects of pore blockage. The HPO and TPI fractions exhibited less fouling and flux decline than the colloids due to their molecular size as well as electrostatic repulsion between organic acids and the membrane surface. However, hydrophobic interactions play a significant role with hydrophobic membranes, causing a reduction of permeate flux. Membrane autopsies using FTIR identified functional groups of organic foulants, supporting the evidence of flux decline by each EfOM isolate. Polysaccharides and/or aminosugars from the collooids in wastewater effluent were found to play an important role in fouling of NF and UF membranes.
机译：将废水流出物有机物（EfOM）分离为不同的馏分，包括胶体，疏水性（HPO）和亲和性（TPI）馏分。 EfOM分离株通过不同的技术进行表征，例如，带有在线UVA和DOC检测器的尺寸排阻色谱（SEC）。傅里叶红外光谱（FTIR），特定UVA（SUVA）和总糖分析。胶体部分主要由多糖，蛋白质和/或氨基糖组成，具有亲水性。 HPO和TPI级分具有腐殖质的特征，即高芳香性和羧基官能团。 EfOM分离物的叠加反映了散装废水的特征，包括从饮用水源输送的难处理的天然有机物（NOM）和从饮用水源和可溶性微生物输送的可溶性微生物产品（SMP）衍生的有机物（NOM）在废水生物处理过程中衍生的产品（SMP）。每个EfOM分离物由于其独特的特性而在NF和UF膜的结垢方面表现出不同的特征。胶体部分显示出较高的通量下降和对NF和UF膜的污染，这主要是由于孔堵塞的影响。由于它们的分子大小以及有机酸与膜表面之间的静电排斥力，HPO和TPI馏分比胶体表现出更少的结垢和通量下降。但是，疏水作用在疏水膜上起着重要的作用，导致渗透通量减少。使用FTIR进行的膜尸检确定了有机污垢的官能团，支持了每种EfOM分离物通量下降的证据。发现废水中胶体中的多糖和/或氨基糖在NF和UF膜结垢中起重要作用。

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