Hyperthermophilic composting coupled with vermicomposting stimulates transformation of organic matter by altering bacterial community.

Autor: Zhou X; Guangdong Key Laboratory of Environmental Pollution and Health, College of Environment and Climate, Jinan University, Guangzhou 511443, China; Institute of Eco-Environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, China., Yu Z; Institute of Eco-Environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, China; Research Center for Eco-Environmental Engineering, Dongguan University of Technology, Dongguan 523808, China. Electronic address: yuzhen@soil.gd.cn., Deng W; Guangdong Key Laboratory of Environmental Pollution and Health, College of Environment and Climate, Jinan University, Guangzhou 511443, China; Institute of Eco-Environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, China., Deng Z; Guangdong Key Laboratory of Environmental Pollution and Health, College of Environment and Climate, Jinan University, Guangzhou 511443, China; Institute of Eco-Environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, China., Wang Y; Institute of Eco-Environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, China., Zhuang L; Guangdong Key Laboratory of Environmental Pollution and Health, College of Environment and Climate, Jinan University, Guangzhou 511443, China. Electronic address: zhuangli@jnu.edu.cn., Zhou S; Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2024 Dec 01; Vol. 954, pp. 176676. Date of Electronic Publication: 2024 Oct 08.
DOI: 10.1016/j.scitotenv.2024.176676
Abstrakt: Hyperthermophilic composting (HTC) has been proven to be an effective strategy to recycle organic wastes, while vermicomposting (VC) has been widely applied to produce humic fertilizer. The combination of HTC with VC (HVC) is expected to integrate the advantages of both. This study showed that HTC pre-fermentation provided plentiful substances such as dissolved organic matter (DOM) for the subsequent VC enriching humic acid (HA). Compared to thermophilic composting (TC), HVC significantly stimulated the degradation of organic matter (OM) and the production of N-rich HA, and incubated higher diversity of bacterial community. SHapley Additive exPlanations (SHAP), correlation network, Mantel test and PLS-LM model were constructed to identify the potential roles of the key bacterial groups contributing to OM transformation. Firmicutes (e.g., Bacillus and Tuberibacillus) dominant in HTC may mineralize and mobilize OM, providing affluent bioavailable nutrients as part of DOM for microbial metabolism and abundant precursors for HA formation in the further VC. Actinobacteriota (e.g., Microbacterium) and Bacteroidota (e.g., Flavobacterium and Parapedobacter) prominent in VC metabolized DOM, mineralized OM and produced HA probably by enhancing the metabolic activity involved in OM degradation and amino acid generation. However, when DOM was exhausted, some members especially Proteobacteria (e.g., Ochrobactrum, Devosia and Cellvibrio) would change their roles from promoter to inhibitor of mineralization and humification. Altering the nutrient bioavailability and the composition of bacterial community can regulate the mineralization, mobilization and humification of OM. Overall, this study provides new insights into the roles of bacteria participating in transforming organic wastes into HA-rich composts.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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