Key extracellular enzymes triggered high-efficiency composting associated with bacterial community succession

Cece Qiao, C. Ryan Penton, Chao Liu, Zongzhuan Shen, Yannan Ou, Zhengyang Liu, Xu Xu, Rong Li, Qirong Shen

    Research output: Contribution to journalArticlepeer-review

    64 Scopus citations

    Abstract

    A consortium of key bacterial taxa plays critical roles in the composting process. In order to elucidate the identity and mechanisms by which specific bacterial species drive high-efficiency composting, the succession of key bacterial consortia and extracellular enzymes produced during the composting process were monitored in composting piles with varying initial C/N ratios. Results showed that C/N ratios of 25 and 35 enhanced composting efficiency through elevated temperatures, higher germination indices, enhanced cellulose and hemicellulose degradation, and higher cellulase and dehydrogenase activities. The activities of cellulase and β-glucosidase, cellulase and protease, and cellulase and β-glucosidase exhibited significant relationships with bacterial community composition within the mesophilic, thermophilic, and mature phases, respectively. Putative key taxa, linked to a higher composting efficiency, such as Nonomuraea, Desemzia, Cellulosimicrobium, Virgibacillus, Clostridium, and Achromobacter, exhibited significantly positive relationships with extracellular enzyme activities, suggesting a significant contribution to these taxa to the development of composting maturity.

    Original languageEnglish (US)
    Article number121576
    JournalBioresource Technology
    Volume288
    DOIs
    StatePublished - Sep 2019

    Keywords

    • Bacterial community
    • C/N ratio
    • Composting efficiency
    • Enzyme activity
    • Key bacterial consortia

    ASJC Scopus subject areas

    • Bioengineering
    • Environmental Engineering
    • Renewable Energy, Sustainability and the Environment
    • Waste Management and Disposal

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