title: [Inactivation and reactivation of antibiotic-resistant bacteria during and after UV disinfection in reclaimed water].
abstract: Prevalence of antibiotic-resistant bacteria in wastewater effluents is concerned as an emerging contaminant. To estimate inactivation and reactivation potentials of antibiotic-resistant bacteria by UV disinfection, inactivation and reactivation of penicillin-, ampicillin-, cephalexin-, chloramphenicol-and rifampicin-resistant bacteria in the secondary effluent were studied under different UV doses. The results showed that the inactivation ratios of penicillin-, ampicillin-, cephalexin-and chloramphenicol-resistant bacteria were higher than 4-log, which was closed to that of total heterotrophic bacteria; however, the inactivation ratio of rifampicin-resistant bacteria was lower (3.7-log) under 20 mJ x cm(-2) UV exposure. After 22 h standing incubation, antibiotic-resistant bacteria widely reactivated. The colony forming ability of antibiotic-resistant bacteria was as high as 3-log when exposed to 20 mJ x cm(-2) UV light. Hence, conventional UV dose can not effectively control reactivation of antibiotic-resistant bacteria in reclaimed water by UV disinfection.
authors.forename: Jing-Jing
authors.initials: JJ
authors.lastname: Huang
authors.forename: Fang
authors.initials: F
authors.lastname: Tang
authors.forename: Jin-Ying
authors.initials: JY
authors.lastname: Xi
authors.forename: Yu-Chen
authors.initials: YC
authors.lastname: Pang
authors.forename: Hong-Ying
authors.initials: HY
authors.lastname: Hu
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology; D001419:Bacteria / Q000187:drug effects / Q000254:growth & development / Q000528:radiation effects*; D004203:Disinfection / Q000379:methods*; D024881:Drug Resistance, Bacterial; D052836:Heterotrophic Processes; D014466:Ultraviolet Rays; D062065:Wastewater / Q000382:microbiology; D014871:Water Microbiology; D018508:Water Purification / Q000379:methods*
chemical_list: D000900:Anti-Bacterial Agents; D062065:Wastewater