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Effect of moisture content on the evolution of bacterial communities and organic matter degradation during bioaugmented biogas residues composting

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Abstract

Composting is an excellent way to recycle biogas residues into a stable, non-toxic agricultural end product. In this study, the dynamic changes of physical–chemical parameters and bacterial community in three groups of bioaugmentation composting systems at different moisture contents (MC) of 50% (MC50), 60% (MC60) and 70% (MC70) were monitored. The differences of bacterial communities in composts with different initial MC were compared, and the interaction between biological and non-biological parameters was also explored. The results revealed that after 30 days of composting, the biogas residues compost in MC60 reached highest temperature of 64 °C, total Kjeldahl nitrogen (TKN) of 2%, seed germination index (GI) of 110%, and the longest thermophilic period duration of 5 days (55 °C). Additionally, the result of high-throughput sequencing showed that the diversity of bacterial communities in MC60 was the highest, and the abundance of Actinobacteria (16.93–52.63%), Firmicutes (8.71–56.75%), and Proteobacteria (16.88–46.95%) in all groups were the highest at phylum level. The LEfSe analysis indicated that the abundance of Ochrobactrum and Cellulomonadaceae in MC60 was significantly (p < 0.05) higher than with other treatments. Moreover, canonical correspondence analysis (CCA) indicated thermophilic period duration is significantly (p < 0.05) positively correlated with Paenibacillus. Besides, it was found the relative abundance of Nocardiopsis and Georgenia has a significant (p < 0.01) correlation with the fertilizer efficiency of compost. These results showed that controlling the initial moisture content at 60% can improve the maturity and fertilizer efficiency of compost, and enable the bacteria beneficial to composting to gain the advantage of proliferation.

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Data availability

The datasets generated during and analyzed during the current study are available from the corresponding author on reasonable request.

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Funding

This study was supported by Key Research and Development Program of Jiangxi Province, China (20192BBF60055), the High-level and High-skilled Leading Talents Training Project of Jiangxi Province, China, Science and Technology Project Founded by the Education Department of Jiangxi Province, China (GJJ180174).

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SZ: Methodology, Investigation, Writing—Original Draft. BZ: Investigation, Formal analysis, Writing—Review & Editing. XA: Data Curation, Software. YH: Validation, XX: Validation, QZ: Conceptualization, Resources, Supervision. All authors reviewed the manuscript.

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Correspondence to Qinghua Zhang.

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The authors declare no competing interests.

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The authors have no relevant financial or non-financial interests to disclose.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Zhang, S., Zhong, B., An, X. et al. Effect of moisture content on the evolution of bacterial communities and organic matter degradation during bioaugmented biogas residues composting. World J Microbiol Biotechnol 39, 1 (2023). https://doi.org/10.1007/s11274-022-03454-7

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  • DOI: https://doi.org/10.1007/s11274-022-03454-7

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