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题名Biochars modify the degradation pathways of dewatered sludge by regulating active microorganisms during gut digestion of earthworms
作者
发表日期2022-07-01
发表期刊Science of the Total Environment
ISSN/eISSN0048-9697
卷号828
摘要

Biochar can accelerate the degradation and mineralization of organic matter during vermicomposting of sludge and the resulted vermicompost is termed as vermi-char containing active enzymes and microorganisms. However, the mechanisms by which biochars affect vermicomposting of the dewatered sludge during gut digestion of earthworms remain unclear. This study aimed to investigate the effects of biochar on the degradation pathways of organic matter and the involved active microorganisms in dewatered sludge during gut digestion of earthworms. The earthworms Eisenia fetida were fed on three sludge substrates; 1) sludge mixed with 5% corncob biochar, 2) sludge mixed 5% rice husk biochar, and 3) sludge without biochar. The results showed that dissolved organic carbon significantly decreased by 5.65%–21.81% after the 5-day gut digestion of earthworms (P < 0.05) and that biochar addition could accelerate the decomposition of aromatic protein-like substances. Contrarily, the nitrate in earthworms casting with biochars significantly increased by 47.32%–122.64% (P < 0.05) compared with the control. The numbers of active bacteria and eukaryotes in earthworm castings with biochars significantly enhanced by 1.34–1.45 times and 0.45–5.91 times, respectively, than the control (P < 0.05). Active Actinobacteria and Bacteroidetes dominated the castings with biochars significantly enriched by 76.18%–88.83% and 4.02%–18.59% (P < 0.05), respectively, compared to control. As for eukaryotes, the biochars amendment increased Cercozoa abundance by 114.23%–136.31% but decreased Annelida by 55.61%–75.88% in the castings. The partial least squares path model revealed that the biochars could change the content and structure of organic matter in earthworm castings during vermicomposting of sludge by affecting environmental factors, microbial abundance, and microbial community composition.

关键词Biochar Excess sludge Fertilizer Gut digestion Microbial community Vermicomposting
DOI10.1016/j.scitotenv.2022.154496
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收录类别SCIE
语种英语English
WOS研究方向Environmental Sciences & Ecology
WOS类目Environmental Sciences
WOS记录号WOS:000790510200004
Scopus入藏号2-s2.0-85126557775
引用统计
被引频次:10[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符https://repository.uic.edu.cn/handle/39GCC9TT/8903
专题北师香港浸会大学
通讯作者Huang, Kui
作者单位
1.School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou,730070,China
2.Key Laboratory of Yellow River Water Environment in Gansu Province,Lanzhou,730070,China
3.Division of Science and Technology,Beijing Normal University-Hong Kong Baptist University United International College,Zhuhai,519087,China
推荐引用方式
GB/T 7714
Huang, Kui,Guan, Mengxin,Chen, Jinet al. Biochars modify the degradation pathways of dewatered sludge by regulating active microorganisms during gut digestion of earthworms[J]. Science of the Total Environment, 2022, 828.
APA Huang, Kui, Guan, Mengxin, Chen, Jin, Xu, Junjie, Xia, Hui, & Li, Yiwen. (2022). Biochars modify the degradation pathways of dewatered sludge by regulating active microorganisms during gut digestion of earthworms. Science of the Total Environment, 828.
MLA Huang, Kui,et al."Biochars modify the degradation pathways of dewatered sludge by regulating active microorganisms during gut digestion of earthworms". Science of the Total Environment 828(2022).
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