Revealing the link between evolution of electron transfer capacity of humic acid and key enzyme activities during anaerobic digestion

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dc.contributor.authorWang, Xiqing
dc.contributor.authorLyu, Tao
dc.contributor.authorDong, Renjie
dc.contributor.authorWu, Shubiao
dc.date.accessioned2021-10-18T12:51:24Z
dc.date.available2021-10-18T12:51:24Z
dc.date.issued2021-10-07
dc.description.abstractHumic acid (HA) is an important active compound formed during anaerobic digestion process, with a complex structure and dynamic electron transfer capacity (ETC). However, the mechanisms by which these macromolecular organic compounds dynamically interact with the microbial anaerobic digestion process at different operating temperatures are still unclear. In this study, the link between the evolution of the ETC of HAs and the microbial community under mesophilic and thermophilic conditions was investigated. The results showed an increasing trend in the ETC of HAs in both mesophilic (671–1479 μmol gHA−1) and thermophilic (774–1506 μmol gHA−1) anaerobic digestion (AD) until day 25. The ETC was positively correlated with the bacterial community of hydrolytic and acidogenic phases, but negatively correlated with the archaeal community of the methanogenic phase. Furthermore, the relationship between ETC and key enzyme activity was explored using a co-occurrence network analysis. HAs revealed a high potential to promote key enzyme activities during hydrolysis (amylase and protease) and acidification (acetate kinase, butyrate kinase, and phosphotransacetylase) while inhibiting the key enzyme activity in the methanogenic phase during the anaerobic digestion process. Moreover, HAs formed under thermophilic conditions had a greater influence on key enzyme activities than those formed under mesophilic conditions. This study advances our understanding of the mechanisms underlying the influence of HAs on anaerobic digestion performance.en_UK
dc.identifier.citationWang X, Lyu T, Dong R, Wu S. (2022) Revealing the link between evolution of electron transfer capacity of humic acid and key enzyme activities during anaerobic digestion. Journal of Environmental Management, Volume 301, January 2021, Article number 113914en_UK
dc.identifier.issn0301-4797
dc.identifier.urihttps://doi.org/10.1016/j.jenvman.2021.113914
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/17182
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectAnaerobic processen_UK
dc.subjectAnaerobic microbial communityen_UK
dc.subjectBio-waste managementen_UK
dc.subjectElectron accepting/donating capacityen_UK
dc.subjectHumic substanceen_UK
dc.titleRevealing the link between evolution of electron transfer capacity of humic acid and key enzyme activities during anaerobic digestionen_UK
dc.typeArticleen_UK

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