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首页> 外文期刊>Desalination: The International Journal on the Science and Technology of Desalting and Water Purification >Natural organic matter (NOM) fouling of ultrafiltration membranes:fractionation of NOM in surface water and characterisation by LC-OCD
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Natural organic matter (NOM) fouling of ultrafiltration membranes:fractionation of NOM in surface water and characterisation by LC-OCD

机译：超滤膜的天然有机物（NOM）结垢：地表水中NOM的分馏和LC-OCD表征

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Natural organic matter (NOM) plays a significant role in fouling of ultrafiltration membranes in drinking water treatment processes.The aim of this study was to obtain a better understanding of the interactions between the fractional components of NOM and a hydrophilic PES/PVP hollow fiber ultrafiltration membrane (150-200 kDa).NOM was fractionated into hydrophobic,transphilic and hydrophilic acid fractions according to the XAD-8/4 resin method proposed by Aiken et a).[I ].UF filtration tests were performed with diluted NOM fractions (1.5 mg/l DOC) isolated from surface water (Lake Ijssel).From NOM fractionation results,Lake IJssel water comprised about 53-55% hydrophobic,20-22% hydrophilic and 25% transphilic NOM acids.Filtration of three NOM fractions (hydrophobic,hydrophilic and transphilic) suggested that the fouling potential was in the order:hydrophilic > hydrophobic > transphilic.The reversibility of fouling due to the hydrophilic fraction was very poor,and decreased from ca.50% in the first cycle to <30% after 6 cycles.LC-OCD (Liquid Chromatography-Organic Carbon Detection) analyses of UF feed and permeate showed almost no rejection of humic acids (20,000-1,000 Da),1OW molecular weight acids (< 350 Da) or neutrals/amphiphilic compounds (<350 Da).The absence of a polysaccharide peak (Mw>20,000 Da) in the LC-OCD chromatogram of the UF permeate,suggested that polysaccharides (> 20,000 Da) were rejected by the UF membrane and may have contributed to fouling.
机译：天然有机物（NOM）在饮用水处理过程中超滤膜结垢中起着重要作用。本研究的目的是更好地了解NOM的组分与亲水性PES / PVP中空纤维超滤之间的相互作用。膜（150-200 kDa）。根据Aiken等人提出的XAD-8 / 4树脂方法，将NOM分为疏水性，亲和性和亲水性酸级分。[I]。用稀释的NOM级分进行超滤过滤试验（从地表水（艾塞尔湖）中分离出1.5 mg / l DOC）。根据NOM分馏结果，艾塞尔湖水包含约53-55％的疏水性，20-22％的亲水性和25％的亲和性NOM酸。三个NOM馏分（疏水性）的过滤（亲水性和亲水性）表明结垢的可能性依次为：亲水性>疏水性>亲液性。由于亲水性部分引起的结垢可逆性非常差，从约50％下降在第一个循环中降至6个循环后的30％以下。超滤进料和渗透液的LC-OCD（液相色谱-有机碳检测）分析显示，几乎没有拒绝腐殖酸（20,000-1,000 Da），1OW分子量酸（<350 Da）或中性/两亲性化合物（<350 Da）。UF渗透液的LC-OCD色谱图中没有多糖峰（Mw> 20,000 Da），这表明UF膜可拒绝多糖（> 20,000 Da）并可能导致结垢。

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