摘要
目的了解采用ClO2消毒医院污水时,污水中微生物达标所需的剩余ClO2量和接触时间。方法在实验室条件下,对经人工加菌的医院污水进行ClO2不同投加量(2、4、6、8、10、12mg/L)、不同接触时间(5、10、30、60、90min)的消毒效果实验,并分别测定样品的ClO2剩余量及微生物含量。结果投加ClO210.0mg/L,接触30min,剩余ClO22.5mg/L时,大肠杆菌灭活率为99.99%;投加ClO210.0mg/L,接触10min,剩余ClO22mg/L时,沙门菌去除率100%;投加ClO210.0mg/L,接触5min,剩余ClO23.5mg/L时,未检出结核杆菌。结论经一级处理的医院污水中剩余ClO2达2.5mg/L,接触时间达30min时,大肠杆菌、沙门菌、结核杆菌指标均达标。
Objective To explore the concentration of required residual available chlorine dioxide(ClO 2 )and optimun contact time for ClO 2 disinfection in order to ensure the microbiological indexes of waste water of hospital disinfected by ClO 2 qualified.Meth ods The waste water samples collected from hospital,to which were aritificially added with predetermined con-centrations of bacteria,were disinfected by various concentrations of ClO 2 (2?4?6?8?10?12mg /L)with various contact time (5?10?30?60?90min).After disinfection,the concentration of residual ClO 2 and the contents of microorganism in waste water samples were determined.Re sults After30-min disinfection by10.0mg /L ClO 2 ,the waste water sample originally containing1.52×10 2 /L E.coli showed a bactericidal rate of99.99%and a concentration of residual ClO 2 at2.5mg /L.After10-min disin-fection by10.0mg /L ClO 2 ,the waste water samples originally containing1.12×10 10 /L Salmonella showed a bactericidal rate of100%and a concentration of residual ClO 2 at2mg /L.After5-min disinfection by10.0mg /L ClO 2 ,the waste water samples o-riginally containing M.tu berculosis at concentration of++++showed a negative result and a concentration of residual ClO 2 at3.5mg/L.Conclusion After the primary treatment,ClO 2 disinfection with contact time of30minutes and a residual concentration of ClO 2 at2.5mg /L could ensure the germicidal effect for E.coli,Salmonella and M.tu berculosis in waste water of hospital qualified.
出处
《环境与健康杂志》
CAS
CSCD
北大核心
2003年第4期228-230,共3页
Journal of Environment and Health
基金
江苏省卫生厅科研基金资助项目(99074)
关键词
医院
污水
消毒
二氧化氯
接触时间
Hospitals
Sewage
Disinfection
Chlorine dioxide
Contact time
