[Effect of ammonia-oxidizing bacteria (AOB) on chloraminated disinfection attenuation in drinking water distribution system].
The growth of microbe and formation of biofilm in water distribution system were important factors affecting the security of water quality. The number of ammonia-oxidizing bacteria (AOB) in biofilm of a chloraminated drinking water distribution system in Shanghai was detected by MPN-Griess method, and the relations among AOB, nitrification and chloraminated disinfection were analyzed. Meanwhile, the effects of AOB on chloraminated disinfection fastness and attenuation by simulation experiment were studied. The result indicated that the number of ammonia-oxidizing bacteria in pipe biofilm was between 1.0 x 10(2)-4.3 x 10(5) MPN/g dry biofilm. Correlation coefficients of AOB with ammonia, nitrite and nitrate were -0.563, 0.603 and -0.563. Correlation coefficients of AOB with total chlorine and mono-chloramine were -0.659 and -0.571. Fastness of AOB to chloramine was higher than heterotrophic bacteria and AOB can deplete more chloramine than HPC.
Bai
Xiao-Hui
XH
Laboratory of Water Science and Technology, College of Life Science and Biotechnology, Shanghai Jiaotong University, Shanghai 200240, China. xhbai@sjtu.edu.cn
Cai
Yun-Long
YL
Zhou
Bin-Hui
BH
Zhi
Xing-Hua
XH
D000641:Ammonia / Q000378:metabolism; D018441:Biofilms; D002700:Chloramines / Q000737:chemistry*; D015169:Colony Count, Microbial; D004203:Disinfection / Q000379:methods*; D009606:Nitrosomonas / Q000254:growth & development* / Q000378:metabolism*; D014871:Water Microbiology; D018508:Water Purification / Q000379:methods; D014881:Water Supply / Q000032:analysis
D002700:Chloramines; D000641:Ammonia; C030816:chloramine