化学法二氧化氯发生器在铁路自备水消毒中的应用

Application of Chlorine Dioxide Generator in Water Disinfection

目的了解化学法二氧化氯发生器在铁路自备水消毒中的应用。方法采集某铁路给水所水样,将其分为实验组、阳性对照组、阴性对照组,在实验前以大肠杆菌(8099)悬液对实验组、阳性对照组水样进行了染菌,实验组采用含二氧化氯0.25mg/L的消毒剂消毒30s,用滤膜法对3组水样中大肠杆菌进行检测。在某铁路给水所进行现场试验,水源为深层地下水,调节发生器计量泵,使管网水中二氧化氯含量≥0.25mg/L;选择距给水所最近(约100m)的1个用户,在开机的时间(8:00—18:00)内,每小时检测1次水样,连续检测5d。参照“五步碘量法”和“N,N-二乙基对苯二胺比色法”测定水中二氧化氯的含量;按照《生活饮用水卫生规范》(2001)检测饮用水水质常规检测项目的指标及亚氯酸盐,并进行评价。结果二氧化氯发生器所产消毒剂原液中二氧化氯浓度为20580mg/L,亚氯酸盐浓度为2060mg/L,Cl2浓度为2560mg/L,消毒剂产量(以二氧化氯计)为92.6g/h。在3次重复的染菌消毒实验中,实验组和阴性对照组的大肠菌群均未检出,阳性对照组大肠菌群含量分别为540、570、620cfu/L。在现场试验中,管网水中二氧化氯浓度基本稳定在0.3～0.5mg/L,消毒后受试水源水质各项指标均合格,其中亚氯酸盐含量为<0.05mg/L。结论该化学法二氧化氯发生器适用于铁路自备水的消毒。

Objective To know the probability of water disinfection of railway water supply provided for themselves by using the chlorine dioxide generator based on chemistry way. Methods According to Technical Standard for Disinfection, filter membrane method was used. The water samples were collected from the railway water supply stations, the germicidal tests were conducted in laboratory and on site. Results In a contact time of 0.5 min, the disinfectant solution containing chlorine dioxide of 0.25 mg/L produced by the generator could meet the requirement of disinfection of drinking water. The generator could maintain chlorine dioxide at 0.3-0.5 mg/L in the pipeline of the water supply. The water quality was up to standard after disinfected. Conclusion The chlorine dioxide generator is suitable for water disinfection of railway water supply provided for themselves.