液氯及次氯酸钠消毒对自来水中余氯及消毒副产物的影响

Effects of chlorine and sodium hypochlorite disinfection on residual chlorine and disinfection by-products of tap water

为避免液氯消毒带来的安全隐患,以江苏某国家级开发区水厂加氯消毒系统升级改造项目为研究对象,采用次氯酸钠代替液氯作为消毒剂,从消毒剂消耗量、余氯及消毒副产物含量等方面进行了对比研究。结果表明:采用两种消毒剂对降低浊度及去除余氯的效果无显著性差异;在同等处理效果下,次氯酸钠和液氯的耗氯量均值分别为14.71 kg/kt和1.47 kg/kt;在分别采用液氯消毒剂和次氯酸钠消毒剂的条件下,三卤甲烷出厂水均值分别为379μg/L和253μg/L;与液氯消毒相比,次氯酸钠消毒工艺在一定程度上降低了消毒副产物的产生。

In order to avoid the potential safety hazards caused by liquid chlorine disinfection,the chlorination disinfection system upgrade project of a water plant in a national development zone in Jiangsu was taken as the research object.Sodium hypochlorite was used instead of liquid chlorine as disinfectant.The disinfectant consumption,residual chlorine and disinfection by-products using liquid chlorine and sodium hypochlorite were compared.The results showed that there was no significant difference in the effect of reducing turbidity and removing residual chlorine using these two disinfectants.With the same treatment effect,the average chlorine consumption of sodium hypochlorite and liquid chlorine were 14.71 kg/kt and 1.47 kg/kt,respectively.Disinfecting with liquid chlorine and sodium hypochlorite,the mean values of THMs were 379μg/L and 253μg/L,respectively.Compared with liquid chlorine disinfection,sodium hypochlorite disinfection process reduced the production of disinfection by-products.