期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 412, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.125212
关键词
Amynthas robustus; Eisenia fetida; Epimerization-dehydration; Metabolic pathway; Vermiremediation
资金
- National Natural Science Foundation of China [41977125, 41907033, 31800109]
- Natural Science Foundation of Guangdong Province [2019A1515011948, 2018A030313131, 2018A030307054]
- Program for Scientific Research Startup Funds of Guangdong Ocean University [R17001]
- Integration Project of Guangdong Union Fund [U1901601]
- Chinese Government?s Thousand Talents Plan for Young Professionals
This study found that vermiremediation significantly accelerates tetracycline degradation and enhances multiple degradation pathways. Different tetracycline degraders were identified in different environments, suggesting the impact of vermiremediation on soil microenvironment and degradation processes.
This study explored the change of tetracycline degradation efficiency, metabolic pathway, soil physiochemical properties and degraders in vermiremediation by two earthworm species of epigeic Eisenia fetida and endogeic Amynthas robustus. We found a significant acceleration of tetracycline degradation in both earthworm treatments, and 4-epitetracycline dehydration pathway was remarkably enhanced only by vermiremediation. Tetracycline degraders from soils, earthworm intestines and casts were different. Ralstonia and Sphingomonas were potential tetracycline degraders in soils and metabolized tetracycline through direct dehydration pathway. Degraders in earthworm casts (Comamonas, Acinetobacter and Stenotrophomonas) and intestines (Pseudomonas and Arthrobacter) dehydrated 4-epitetracycline into 4-epianhydrotetracycline. More bacterial lineages resisting tetracycline were found in earthworm treatments, indicating the adaptation of soil and intestinal flora under tetracycline pressure. Earthworm amendment primarily enhanced tetracycline degradation by neutralizing soil pH and consuming organic matters, stimulating both direct dehydration and epimerization-dehydration pathways. Our findings proved that vermicomposting with earthworms is effective to alter soil microenvironment and accelerate tetracycline degradation, behaving as a potential approach in soil remediation at tetracycline contaminated sites.
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