Impacts of biochar on the environmental risk of antibiotic resistance genes and mobile genetic elements during anaerobic digestion of cattle farm wastewater

Bioresource Technology
Wei SunXiaxia Tuo

Abstract

Biochar has positive effects on nitrogen conservation during anaerobic digestion, but its impacts on antibiotic resistance genes (ARGs) are unclear. Therefore, the effect of biochar (0, 5, 20, and 50 g/L) on the environmental risk of ARGs during cattle manure wastewater anaerobic digestion were investigated. The results showed that 5 g/L biochar reduced the relative abundances (RAs) of 5/13 ARGs while 20 g/L biochar significantly reduced the total RAs of ARGs in the digestion products, where the RA of ISCR1 was 0.89 log lower than the control. Biochar mainly affected the distribution of ARGs by influencing the RAs of Firmicutes and Proteobacteria, and the influence of 20 g/L biochar was greater than that of 5 g/L. Mobile genetic elements also influenced the ARG profiles, especially intI2 and ISCR1. The addition of 20 g/L biochar to cattle farm wastewater anaerobic digestion systems could reduce the environmental risk of ARGs.

Citations

Apr 13, 2018·International Journal of Environmental Research and Public Health·Xiaojuan WangHaichao Li
Apr 10, 2021·Environmental Science and Pollution Research International·Andressa Rezende PereiraSilvana de Queiroz Silva
Jun 18, 2021·Ecotoxicology and Environmental Safety·Xiuwen QiuHuijuan Wang
Jul 10, 2021·Environmental Pollution·Jian-Hua ChengChen Liu
Aug 2, 2021·Bioresource Technology·Biyensa GurmessaStefania Cocco
Jan 4, 2022·The Science of the Total Environment·Xinyi HuLiping Lou

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