文献类型：期刊文献

英文题名：Impact of fulvic acids on bio-methanogenic treatment of municipal solid waste incineration leachate

作者：Dang, Yan[1,3];Lei, Yuqing[1];Liu, Zhao[1];Xue, Yiting[1,6];Sun, Dezhi[1];Wang, Li-Ying[3,4,5];Holmes, Dawn E.[2,3]

机构：[1]Beijing Forestry Univ, Coll Environm Sci & Engn, Engn Res Ctr Water Pollut Source Control & Ecorem, Beijing Key Lab Source Control Technol Water Poll, 35 Tsinghua East Rd, Beijing 100083, Peoples R China;[2]Western New England Univ, Dept Phys & Biol Sci, Springfield, MA 01119 USA;[3]Univ Massachusetts Amherst, Morrill N Sci Ctr 4, Dept Microbiol, Amherst, MA 01003 USA;[4]East China Univ Sci & Technol, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China;[5]East China Univ Sci & Technol, Inst Appl Chem, Shanghai 200237, Peoples R China;[6]Environm Monitoring Stn Ningdong Energy & Chem In, Ningxia 750411, Peoples R China

年份：2016

卷号：106

起止页码：71

外文期刊名：WATER RESEARCH

收录：;EI(收录号：20164002872223);WOS:【SCI-EXPANDED(收录号:WOS:000388047500007)】；

基金：We thank Professor Runcang Sun and Dr. Jialong Wen from Beijing Forestry University for the NMR tests. This research was financially supported by the Beijing Science and Technology Plan Projects (Beijing Science and Technology Commission), and the Fundamental Research Funds for the Central Universities (BLYJ201401), as well as the National Natural Science Foundation of China (51678051).

语种：英文

外文关键词：Fulvic acids; Incineration leachate; Methanogenesis; Electron shuttle; EGSB reactor

摘要：A considerable amount of leachate with high fulvic acid (FA) content is generated during the municipal solid waste (MSW) incineration process. This incineration leachate is usually processed by downstream bio-methanogenic treatment. However, few studies have examined the impact that these compounds have on methanogenesis and how they are degraded and transformed during the treatment process. In this study, a laboratory-scale expanded granular sludge bed (EGSB) reactor was operated with MSW incineration leachate containing various concentrations of FA (1500 mg/L to 8000 mg/L) provided as the influent. We found that FA degradation rates decreased from 86% to 72% when FA concentrations in the reactor were increased, and that molecular size, level of humification and aromatization of the residual FA macromolecules all increased after bio-methanogenic treatment. Increasing FA influent concentrations also inhibited growth of hydrogenotrophic methanogens from the genus Methanobacterium and syntrophic bacteria from the genus Syntrophomonas, which resulted in a decrease in methane production and a concomitant increase in CO2 content in the biogas. Sequences most similar to species from the genus Anaerolinea went up as FA concentrations increased. Bacteria from this genus are capable of extracellular electron transfer and may be using FA as an electron acceptor for growth or as a shuttle for syntrophic exchange with other microorganisms in the reactor. In order to determine whether FA could serve as an electron shuttle to promote syntrophy in an anaerobic digester, co-cultures of Geobacter metallireducens and G. sulfurreducens were grown in the presence of FA from raw leachate or from residual bioreactor effluent. While raw FA stimulated electron transfer between these two bacteria, residual FA did not have any electron shuttling abilities, indicating that FA underwent a significant transformation during the bio-methanogenic treatment process. These results are significant and should be taken into consideration when optimizing anaerobic 'bioreactors used to treat MSW incineration leachate high in FA content. (C) 2016 Elsevier Ltd. All rights reserved.