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Fouling characteristics of wastewater effluent organic matter (EfOM) isolates on NF and UF membranes

机译:污水污水有机物(EFOM)分离物对NF和UF膜的结垢特征

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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 transform 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 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 colloids in wastewater effluent were found to play an important role in fouling of NF and UF membranes.
机译:将废水污水有机物(EFOM)分离成不同的级分,包括胶体和疏水性(HPO)和横向(TPI)级分。通过不同的技术表征了EFOM分离株,例如,具有在线UVA和DOC检测器,傅里叶变换红外(FTIR),特定UVA(SUVA)和总糖分析的尺寸排阻色谱(SEC)。胶体级分主要由多糖,蛋白质和/或氨基糖组成,提供亲水性。 HPO和TPI级分具有腐殖质物质的特征,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污水的特性,由在废水处理的生物过程中衍生的饮用水源和可溶性微生物产品(SMP)输送的难熔天然有机物质(NOM)组成。由于其不同的特征,每个EFOM分离物在NF和UF膜的污垢中表现出不同的特征。胶体部分在NF和UF膜上显示出高通量下降和污染,主要是由于孔隙堵塞的影响。由于它们的分子大小以及有机酸和膜表面之间的静电排斥,HPO和TPI馏分表现出比胶体的污垢和助熔剂下降。然而,疏水相互作用在疏水膜中发挥着重要作用,导致渗透助焊剂的减少。使用FTIR的膜尸体识别有机污垢的官能团,支持各种EFOM分离物的助焊剂的证据。发现多糖和/或氨基甘油在废水污水中的胶体中的含量在NF和UF膜的污垢中起重要作用。

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