Bacterial Community Succession in Earthworm Mucus and Sludge Compost and its Relationship with Environmental Factors
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School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China
Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-founded by Anhui Province and Ministry of Education, Wuhu 241000, China
Engineering laboratory of comprehensive utilization and ecological protection of soil and water resources in high diving level mining area of Anhui province, Huainan 232001, China
College of Biological Engineering, Huainan Normal University, Huainan 232001, China
Key Laboratory of Bioresource and Environmental Biotechnology of Anhui Higher Education Institutes, Huainan 232038, China
School of Metallurgy and Energy Engineering, Kunming University of Science and Technology, Kunming 650031, China
Anhui Open Source Landscaping Engineering Co., LTD, Hefei 230031, China
Submission date: 2023-12-09
Final revision date: 2024-01-10
Acceptance date: 2024-01-26
Online publication date: 2024-04-11
Corresponding author
Xingming Wang   

School of Earth and Environment, Anhui University of Science and Technology, Huainan 232001, China
This study investigated the effects of adding earthworm mucus on the changes in sludge compost bacterial community structure and its response to environmental factors. The results showed that adding earthworm mucus improved the composting effect of sludge, reducing nitrogen loss and increasing nutrients; nitrogen loss decreased by 5.55%, and potassium and phosphorus increased by 10.23 and 16.28%, respectively. Firmicutes, Chloroflexi, Actinobacteria, and Proteobacteria were the main bacterial phyla in the sludge, with a combined relative abundance of over 60%. The addition of earthworm mucus significantly impacted bacterial community structure and composting activity, increasing the relative abundance of dominant bacteria during the process. Redundancy analysis showed that environmental factors significantly impacted the changes in bacterial community structure during composting. The results indicate that the addition of earthworm mucus increases the relative abundance of advantageous bacteria playing essential roles in sludge composting, enhancing the fertility and maturity of sludge composting products by significantly reducing nitrogen loss and increasing potassium and phosphorus. Based on the response relationship between environmental factors and bacterial communities, the bacterial community structure in sludge composting can be improved by regulating environmental factors (such as pH and moisture content), enhancing the effectiveness of sludge composting.
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