CHU Fu-min,SUN Shao-hua,LU Nan-nan,et al.Isolation, Identification and Characteristic Analysis of Chlorine-resistant Bacteria in Urban Water Supply Pipe Network[J].China Water & Wastewater,2020,36(21 21):42-46.
Isolation, Identification and Characteristic Analysis of Chlorine-resistant Bacteria in Urban Water Supply Pipe Network
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
21 21
Page:
42-46
Column:
Date of publication:
2020-11-01
- Keywords:
- water supply pipe network; chlorine-resistant bacteria; Gordonia terrae; isolation; identification
- Abstract:
- Screening and characterization of chlorine-resistant bacteria in urban water supply pipe netwrok are of great significance in microbial safety assessment of drinking water. Based on traditional microbial culture technology, a method for screening and isolating chlorine-resistant bacteria in urban water supply pipe network was proposed, and a chlorine-resistant bacterium—Gordonia terrae, was successfully isolated from a water supply pipe network of Yellow River Diversion Project. The strain was a conditional pathogen, Gram-positive and aerobic. The chlorine resistance of this strain was significantly higher compared with that of Escherichia coli. Within 2 hours, 2.5 mg/L of residual chlorine could not inactivate all the Gordonia terrae with a concentration of 107 CFU/mL, and the inactivation rate was only 3lg. Under the same disinfection conditions, Escherichia coli was basically inactivated after 20 minutes of disinfectant action. The emergence of chlorineresistant bacteria in water supply pipe network poses a new challenge to the current disinfection process in water treatment plants.
Last Update:
2020-11-01