Performances of antibiotic resistance genes profile upon the action of biochar-activated peroxydisulfate in composting. (15th May 2023)

• Record Type: Journal Article
• Authors: Li, Jixuan; Lu, Heng; Yang, Hongmei; Wen, Xiaoli; Huang, Yite; Li, Qunliang
• Is Part Of: Journal of environmental management. Volume 334(2023)
• Publication Date: 2023-05-15
• Subjects: Metagenomics analysis -- Advanced oxidation technology -- Compost -- Physicochemical habitat -- Microbial communities; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2023.117509
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: In this study, the amendment of biochar-activated peroxydisulfate during composting to remove antibiotic resistance genes (ARGs) by direct (microbial community succession) and indirect methods (physicochemical factors) was analyzed. When implementing indirect methods, the synergistic effect of peroxydisulfate with biochar optimized the physicochemical habitat of compost, maintaining its moisture within a range of 62.95%–65.71%, and a pH of 6.87–7.73, and causing the compost to mature 18 days earlier than the control groups. The direct methods caused the optimized physicochemical habitat to adjust the microbial communities and reduce the abundance of most of the ARG host bacteria ( Thermopolyspora, Thermobifida, and Saccharomonospora ), thus inhibiting this substance's amplification. Heatmap analysis confirmed the necessary connection between physicochemical factors, microbial communities, and ARGs. Moreover, a mantel test confirmed the direct significant effect of the microbial communities on ARGs and the indirect significant effect of physicochemical factors on ARGs. The results showed that the abundance of more ARGs was down-regulated at the end of composting and regulated by biochar-activated peroxydisulfate, especially for the abundance of AbaF, tet(44), golS, and mryA, which was significantly decreased by 0.87–1.07 fold. These results provide new insights into the removal of ARGs during composting. Graphical abstract: Image 1 Highlights: Peroxydisulfate (PS) was activated by biochar (BC) during composting. Physicochemical habitats of compost were optimized by BC/PS. BC/PS greatly regulated microbial community succession. Most ARGs ( AbaF, tet(44), golS, etc) were efficiently removed by BC/PS.