Journal
BIORESOURCE TECHNOLOGY
Volume 342, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.126049
Keywords
Excess sludge; Factory composting; Antibiotic resistome; Mobile genetic elements
Funding
- Department of Science and Technology of Sichuan Province, China [2019YFH0068, 2020YFH0163]
- Key Laboratory for Water Pollution Control and Environment Safety, Zhejiang Province, China [2017ZJSHKF03]
- Key Laboratory of Agricultural Environment in Southwest Mountain Areas, Ministry of Agriculture and Rural Affairs, China [AESMA-OPP-2019007]
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By tracking the changes of ARGs and microbial communities in a full-scale plant engaged in excess sludge composting, this study found that full-scale composting could significantly reduce the absolute and relative abundance of ARGs. Pathway analysis showed that MGEs and composting physicochemical properties were the key factors directly influencing ARGs, while network analysis indicated Proteobacteria, Bacteroidetes, Firmicutes, and Actinobacteria as the main hosts of ARGs in composting.
The alteration of antibiotic resistance genes (ARGs) during sludge composting has been less studied in a full-scale plant, causing the miss of practical implications for understanding/managing ARGs. Therefore, this study tracked the changes of ARGs and microbial communities in a full-scale plant engaged in excess sludge composting and then explored the key factors regulating ARGs through a series of analyses. After composting, the absolute and relative abundance of ARGs decreased by 91.90% and 66.57%, respectively. Additionally, pathway analysis showed that MGEs, composting physicochemical properties were the most vital factors directly influencing ARGs. Finally, network analysis indicated that Proteobacteria, Bacteroidetes, Firmicutes, and Actinobacteria were the main hosts of ARGs. Based on these findings, it can be known that full-scale composting could reduce ARGs risk to an extent.
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