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Degradation properties of fulvic acid and its microbially driven mechanism from a partial nitritation bioreactor through multi-spectral and bioinformatic analysis

查看全文 作　　者：Quanhao [1]Dou;Li [1]Zhang;Tingjun [1]Dong;Zixuan [1]Song;Xuepeng [1]Fan;Yongzhen [1]Peng;Xiayan [2]Wang;Jiachun [3]Yang 高影响力作者 机构地区：[1]National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology,Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering,Beijing University of Technology,Beijing 100124,China;[2]Department of Chemistry and Biology,Center of Excellence for Environmental Safety and Biological Effects,Beijing Key Laboratory for Green Catalysis and Separation,Beijing University of Technology,Beijing 100124,China;[3]Environmental Protection Development Group Co.,Ltd.,Shandong 250101,China高影响力机构 出　　处：《Journal of Environmental Sciences》索引2024年第1期,共14页高影响力期刊 基　　金：supported by the Key Research and Development Project of Shandong (Nos.2021CXGC011202,2020CXGC011404,and 2022CXGC021002);the National Natural Science Foundation of China (No.22276006)。 摘　　要：This study employed multispectral techniques to evaluate fulvic acid(FA)compositional characteristic and elucidate its biodegradation mechanisms during partial nitritation(PN)process.Results showed that FA removal efficiency(FRE)decreased from 90.22 to 23.11%when FA concentrations in the reactor were increased from 0 to 162.30 mg/L,and that molecular size,degree of aromatization and humification of the effluent FA macromolecules all increased after treatment.Microbial population analysis indicated that the proliferation of the Comamonas,OLB12 and Thauera exhibit high FA utilization capacity in lower concentrations(<50.59 mg/L),promoting the degradation and removal of macromolecular FA.In addition,the sustained increase in external FA may decrease the abundance of above functional microorganisms,resulting in a rapid drop in FRE.Furthermore,from the genetic perspective,the elevated FA levels restricted carbohydrate(ko00620,ko00010 and ko00020)and nitrogen(HAO,AMO,NIR and NOR)metabolism-related pathways,thereby impeding FA removal and total nitrogen loss associated with N_(2)O emissions. 关 键 词：Partial nitritation Fulvic acid 3DEEM-PARAFAC UV/Vis Microbially driven mechanism
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