文献类型：期刊文献

英文题名：Enhanced removal of humic substances in effluent organic matter from a leachate treatment system via biological upgradation of molecular structure

作者：Chen, Mengfan[1];Jin, Xibiao[1];Wang, Yuan[1];Wang, Xinyi[1];Cai, Zhengqing[1];Sun, Xianbo[1]

机构：[1]East China Univ Sci & Technol, Res Inst Environm Engn, Natl Engn Lab Highconcentrat Refractory Organ Was, Room 329,Expt Bldg 8,130 Mei Long Rd, Shanghai 200237, Peoples R China

年份：2022

卷号：43

期号：23

起止页码：3620

外文期刊名：ENVIRONMENTAL TECHNOLOGY

收录：;EI(收录号：20212210435015);WOS:【SCI-EXPANDED(收录号:WOS:000655786800001)】；

基金：This study was financially supported by projects of National Natural Science Foundation of China [grant number 41807340].

语种：英文

外文关键词：Biological upgradation process; carboxyl content; humic substances; leachate; molecular weight

摘要：Biological upgradation (BU) process was proposed, with the goal of converting the molecular structure, for improving the coagulation effect on humic substances (HS) in effluent organic matter from the membrane bioreactor of a leachate treatment system. Enhancement of coagulation effect was observed with the improvement of chemical oxygen demand and HS removal efficiency from 45.5% and 56.5% to 80.0% and 92.6% (Fe dosage was 400 mg center dot L-1), respectively, which was approximately 30-40% higher than the other available researches. Variations in molecular weight (MW) and carboxyl contents of fulvic acid (FA) and humic acid (HA) were analysed by size exclusion chromatography coupled with dissolved organic carbon detection, potentiometric titration and Fourier transform infrared spectroscopy. The obtained results indicated that BU process led to the growth of MW of HS, of which the larger MW (1650 Da) FA and HA raised from 19.07 and 0.34 mgC center dot L-1 to 71.67 and 1.58 mgC center dot L-1, respectively, as well as increases in the carboxyl contents of FA and HA from 6.70 and 6.28 meq center dot gC(-1) to 11.84 and 8.71 meq center dot gC(-1), respectively. Because of this, a stronger binding effect between Fe and HS might be formed that improved the coagulation effect.