doi: 10.3967/bes2013.012
Inactivation and Regrowth of Antibiotic-resistant Bacteria by PAA Disinfection in the Secondary Effluent of a Municipal Wastewater Treatment Plant
- 
					    摘要:Inactivation and microbial regrowth of penicillin-,ampicillin-,cefalexin-,tetracycline-,chloramphenicol-,and rifampicin-resistant bacteria were studied to explore risks associated with selection and regrowth of antibiotic-resistant bacteria after PAA disinfection.The results showed that after exposure to 20 mg/L PAA for 10 min,inactivation of ampicillin-resistant bacteria reached 2.3-log,which was significantly higher than that of total heterotrophic bacteria with a decrease of 2.0-log.In contrast,inactivation of tetracyclineresistant bacteria was significantly less efficient,reaching only 1.1-log.Chloramphenicol-and tetracycline-resistant bacteria,as well as total heterotrophic bacteria regrew more than 10 fold compared to those in the untreated wastewater sample with 22 h stilling culture after exposure to 2 or 5 mg/L PAA as for 10 min.Selection and potential regrowth of tetracycline-and chloramphenicol-resistant bacteria are potential risks when utilizing PAA disinfection,which may induce the spread of specific antibiotic-resistant bacteria in reclaimed water. Abstract:Inactivation and microbial regrowth of penicillin-,ampicillin-,cefalexin-,tetracycline-,chloramphenicol-,and rifampicin-resistant bacteria were studied to explore risks associated with selection and regrowth of antibiotic-resistant bacteria after PAA disinfection.The results showed that after exposure to 20 mg/L PAA for 10 min,inactivation of ampicillin-resistant bacteria reached 2.3-log,which was significantly higher than that of total heterotrophic bacteria with a decrease of 2.0-log.In contrast,inactivation of tetracyclineresistant bacteria was significantly less efficient,reaching only 1.1-log.Chloramphenicol-and tetracycline-resistant bacteria,as well as total heterotrophic bacteria regrew more than 10 fold compared to those in the untreated wastewater sample with 22 h stilling culture after exposure to 2 or 5 mg/L PAA as for 10 min.Selection and potential regrowth of tetracycline-and chloramphenicol-resistant bacteria are potential risks when utilizing PAA disinfection,which may induce the spread of specific antibiotic-resistant bacteria in reclaimed water. - 
									Key words:
									
- heterotrophic bacteria
 
- 
						
						  
 点击查看大图
 点击查看大图
								计量
- 文章访问数: 1516
- HTML全文浏览量: 453
- PDF下载量: 58
- 被引次数: 0
 
	         
								 
					 
										 
						
						
						
					 下载:
下载: 
				 
            Quick Links
 Quick Links