Quantitative changes in antibiotic resistance genes (ARGs) were investigated in six urban wastewater treatment plants (WWTPs) treating municipal and industrial wastewaters. In a selected WWTP, the fate of ARGs was studied in a 1-year time interval and in two phases of wastewater treatment process. Nine ARGs ( tet W, tet O, tet A, tet B, tet M, bla TEM , erm B, sul 1, and intl 1) were quantified in total and their relative abundance assessed by ARG copies/16SrRNA copies. From the tetracycline resistance genes, tet W was the only one detected in all sampled WWTPs. Its relative abundance in the nitrification tank of WWTP5 was found stable during the 1-year period, but was lowered by secondary sedimentation processes in the wastewater treatment down to 24% compared to the nitrification tank. Bacterial isolates showing high tetracycline resistance (minimal inhibition concentrations >100 μg/mL) were identified as members of Acinetobacter , Klebsiella , Citrobacter, Bacillus , and Enterobacter genera. Dynamic shifts in the relative abundance of erm B and sul 1 were also demonstrated in wastewater samples from WWTP5.
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Svobodová et al. (2018) studied this question.
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