Preferential binding between intracellular organic matters and Al_(13) polymer to enhance coagulation performance

查看全文 作　　者：Ruiping [1,2]Liu;Tingting [1,3]Guo;Min [1,4]Ma;Mingquan [5]Yan;Jing [1]Qi;Chengzhi [1,2]Hu;Gang [6]Liu;Huijuan [2,7]Liu;Jiuhui [1,2]Qu;Walter van der [8]Meer

机构地区：[1]Key Laboratory of Drinking Water Science and Technology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences;[2]University of Chinese Academy of Sciences;[3]Beijing University of Technology;[4]Beijing Waterworks Group;[5]Department of Environmental Engineering,Peking University;[6]Sanitary Engineering,Department of Water Management,Faculty of Civil Engineering and Geosciences,Delft University of Technology;[7]State Key Laboratory of Environmental Aquatic Chemistry,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences;[8]Science and Technology,University of Twente

出　　处：《Journal of Environmental Sciences》索引2019年第31卷第2期,共11页

基　　金：supported by the Natural Key R&D Program of China (No.2016YFC0400802);the Natural Science Foundation of China (No.51225805) 摘　　要：Coagulation is the best available method for removing intracellular organic matter(IOM),which is released from algae cells and is an important precursor to disinfection by-products in drinking water treatment. To gain insight into the best strategy to optimize IOM removal, the coagulation performance of two Al salts, i.e., aluminum chloride(AlCl_3) and polyaluminum chloride(PACl, containing 81.2% Al_(13)), was investigated to illuminate the effect of Al species distribution on IOM removal. PACl showed better removal efficiency than AlCl_3 with regard to the removal of turbidity and dissolved organic carbon(DOC), owing to the higher charge neutralization effect and greater stability of pre-formed Al_(13) species. High pressure size exclusion chromatography analysis indicated that the superiority of PACl in DOC removal could be ascribed to the higher binding affinity between Al_(13) polymer and the low and medium molecular weight(MW) fractions of IOM. The results of differential log-transformed absorbance at 254 and 350 nm indicated more significant formation of complexes between AlCl_3 and IOM, which benefits the removal of tryptophan-like proteins thereafter. Additionally,PACl showed more significant superiority compared to AlCl_3 in the removal of <5 kD a and hydrophilic fractions, which are widely viewed as the most difficult to remove by coagulation.This study provides insight into the interactions between Al species and IOM, and advances the optimization of coagulation for the removal of IOM in eutrophic water. 关键词：INTRACELLULAR organic matter COAGULATION POLYALUMINUM CHLORIDE Molecular weight distribution HYDROPHILIC FRACTION

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Preferential binding between intracellular organic matters and Al_(13) polymer to enhance coagulation performance

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