雨水吸附预处理后的膜污染倾向：详细的有机物特性分析

Membrane fouling propensity after adsorption as pretreatment in rainwater: a detailed organic characterisation.

作者信息

Sabina L, Kus B, Shon H-K, Kandasamy J

机构信息

Faculty of Engineering, University of Technology, Sydney, P.O. Box 123, Broadway NSW 2007, Australia.

出版信息

Water Sci Technol. 2008;58(8):1535-9. doi: 10.2166/wst.2008.522.

DOI:10.2166/wst.2008.522

PMID:19001704

Abstract

Organic characterisation in rainwater was investigated in terms of dissolved organic carbon (DOC) and molecular weight distribution (MWD) after powdered activated carbon (PAC) adsorption. PAC adsorption was used as pretreatment to membrane filtration to reduce membrane fouling. The MW of organic matter in rainwater used in this study was in the range of 43,000 Da to 30 Da. Each peak of organic matter consisted of biopolymers (polysaccharides and proteins), humic and fulvic acids, building blocks, low MW acids (hydrolysates of humic substances), low MW neutrals and amphiphilics. Rainwater contained the majority of hydrophilic compounds up to 72%. PAC adsorption removed 33% of total DOC. The removal efficiencies of the hydrophobic and hydrophilic fractions after PAC adsorption were 50% and 27%, respectively. PAC adsorption was found to preferentially remove the hydrophobic fraction. The majority of the smaller MW of 1,100 Da, 820 Da, 550 Da, 90 Da and 30 Da was removed after PAC adsorption. The MFI values decreased from 1,436 s/L2 to 147 s/L2 after PAC adsorption. It was concluded that PAC adsorption can be used as a pretreatment to membrane filtration with rainwater.

摘要

在粉末活性炭（PAC）吸附后，从溶解有机碳（DOC）和分子量分布（MWD）方面对雨水中的有机特性进行了研究。PAC吸附被用作膜过滤的预处理，以减少膜污染。本研究中使用的雨水中有机物的分子量范围为43,000 Da至30 Da。有机物的每个峰由生物聚合物（多糖和蛋白质）、腐殖酸和富里酸、结构单元、低分子量酸（腐殖物质的水解产物）、低分子量中性物和两亲物组成。雨水中含有高达72%的亲水性化合物。PAC吸附去除了33%的总DOC。PAC吸附后疏水和亲水部分的去除效率分别为50%和27%。发现PAC吸附优先去除疏水部分。PAC吸附后，大部分较小分子量的1,100 Da、820 Da、550 Da、90 Da和30 Da被去除。PAC吸附后，膜污染指数（MFI）值从1,436 s/L2降至147 s/L2。得出的结论是，PAC吸附可用作雨水中膜过滤的预处理。