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Qiao, Cece; Ryan Penton, C.; Liu, Chao; Shen, Zongzhuan; Ou, Yannan; Liu, Zhengyang; Xu, Xu; Li, Rong; Shen, Qirong
Bioresource technology, 09/2019, Letnik: 288Journal Article
•Feasible C/N ratios enhanced composting efficiency.•Composting treatment and phase influenced bacterial community.•Variations of enzymes were related to bacterial community succession.•Functional enzymes related to key taxa enhanced composting efficiency. 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.
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