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Dominant denitrifying bacteria are important hosts of antibiotic resistance genes in pig farm anoxic-oxic wastewater treatment processes
Environment International ( IF 10.3 ) Pub Date : 2020-06-29 , DOI: 10.1016/j.envint.2020.105897 Yiwen Yang 1 , Ruiting Wu 1 , Jiaxin Hu 1 , Sicheng Xing 1 , Chunbo Huang 1 , Jiandui Mi 2 , Xindi Liao 2
Environment International ( IF 10.3 ) Pub Date : 2020-06-29 , DOI: 10.1016/j.envint.2020.105897 Yiwen Yang 1 , Ruiting Wu 1 , Jiaxin Hu 1 , Sicheng Xing 1 , Chunbo Huang 1 , Jiandui Mi 2 , Xindi Liao 2
Affiliation
The anoxic-oxic (A/O) wastewater treatment process that is widely used in pig farms in China is an important repository for antibiotic resistance genes (ARGs). However, the distribution of ARGs and their hosts in the A/O process has not been well characterized. In this study, the wastewaters in the anoxic and oxic tanks for A/O processes were collected from 38 pig farms. The concentrations of 20 subtypes of ARGs, 5 denitrification-related genes, 2 integrons, and bacterial community composition were investigated. Bacterial genome binning was performed using metagenome sequencing. In this study, 20 subtypes of ARGs and integrons were detected in all sampling sites. A total of 16 of the 20 subtypes of ARGs were detected with the highest abundance in anoxic tanks, and was detected with a maximum average abundance of 19.21 ± 0.24 log (copies/mL). Cooccurrence patterns were observed for some genes in the pig farm A/O process, such as and , and , and and . There was a significant cooccurrence pattern between the dominant denitrifying bacteria and some ARGs (, , and ), so the dominant denitrifying bacteria were considered to be potential ARG hosts. In addition, 170 highly abundant bacterial genome bins were assembled and further confirmed that the denitrifying bacteria , , and were the important ARG hosts in the pig farm A/O process, providing a useful reference for the surveillance and risk management of ARGs in pig farm wastewater.
更新日期：2020-06-29
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