[Change in genotoxicity of wastewater during chlorine dioxide and ahlorine disinfections and the influence of ammonia nitrogen].
The effects of chlorine dioxide and chlorine disinfections on genotoxicity of different biologically treated sewage wastewater samples were studied by umu-test. The experiment results showed that when chlorine dioxide dosage increased from 0 mg/L to 30 mg/L, the genotoxicity of wastewater first decreased rapidly and then tended to be stable, while when the chlorine dosage increased from 0 mg/L to 30 mg/L, the genotoxicity of wastewater changed diversely for different samples. It was then found that ammonia nitrogen did not affect the change of genotoxicity during chlorine dioxide disinfection of wastewater, while it greatly affected the change of genotoxicity during chlorine disinfection of wastewater. When the concentration of ammonia nitrogen was low (< 10 - 20 mg/L), the genotoxicity of wastewater decreased after chlorine disinfection, and when the concentration of ammonia nitrogen was high (> 10 - 20 mg/L), the genotoxicity of wastewater increased after chlorine disinfection.
Wang
Li-Sha
LS
Environmental Simulation and Pollution Control State Key Joint Laboratory, Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China. wls02@mails.tsinghua.edu.cn
Hu
Hong-Ying
HY
Ta
Chun-Hong
CH
Tian
Jie
J
Wang
Chao
C
Koichi
Fujie
F
D000641:Ammonia / Q000737:chemistry*; D002713:Chlorine / Q000737:chemistry / Q000633:toxicity; D017606:Chlorine Compounds / Q000737:chemistry* / Q000633:toxicity; D004202:Disinfectants / Q000737:chemistry* / Q000633:toxicity; D009152:Mutagenicity Tests / Q000379:methods; D010087:Oxides / Q000737:chemistry* / Q000633:toxicity; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry
D017606:Chlorine Compounds; D004202:Disinfectants; D010087:Oxides; D014874:Water Pollutants, Chemical; D002713:Chlorine; D000641:Ammonia; C025109:chlorine dioxide