Fig 1.
Treatment process for the chosen municipal wastewater treatment plant.
Table 1.
The primers of four ERY and four TC resistance genes used in the study.
Fig 2.
Heterotrophic bacteria resistant to nine antibiotics after different doses of chlorination.
VAN, CEP, SD, ERY, RIF, GEN, TC, CIP, CHL and ERY&TC represent. vancomycin-, cephalexin-, sulfadiazine-, erythromycin-, rifampicin-, gentamicin-, tetracycline-, ciprofloxacin-, chloramphenicol and erythromycin & tetracycline- resistant bacteria, respectively. Error bars indicate standard deviation for replicates from a single sample.
Fig 3.
Abundance of four ERY resistance genes (a) and four TC resistance genes (b) in samples treated by chlorination under a series of doses (mg Cl2 min/L).
Error bars indicate standard deviation for replicates from a single sample.
Fig 4.
Ratio curves for ERY- and TC- resistant bacteria and genes under a series of doses (mg Cl2 min/L).
Ratio = Ni/N0, where N0: Initial concentrations of ERY- or TC- resistant bacteria or genes in samples before chlorination; Ni: Concentrations of ERY- or TC- resistant bacteria or genes in samples treated by chlorination at a certain dose.