加氯对不同工艺出水消毒副产物生成的研究

分析了W市太湖水净化过程中多点加氯后生成的三卤甲烷消毒副产物含量和其中各组分的比例分配情况,发现对于含有较高浓度溴离子的原水而言,消毒不仅会造成溴代消毒副产物绝对值的增加,还会提高其在三卤甲烷中的分配比例,因此溴代消毒副产物浓度的增加是引起三卤甲烷浓度增高的主要原因。同时,通过开展小试比较液氯和次氯酸钠对以太湖水为原水的水处理消毒效果,得到液氯较次氯酸钠的氧化性更强,投加液氯会促进三氯甲烷的生成,而投加次氯酸钠会造成三溴甲烷、二氯一溴甲烷和一氯二溴甲烷浓度的升高。总体而言,投加次氯酸钠生成的三卤甲烷消毒副产物浓度更高。

Formation of Chlorinated Disinfection By-products in Different Water Treatment Processes

The concentration and proportion of each component of strihalomethanes ( THMs ) in the water from Tai Lake after the multi-point chlorination procedure of water purification were analyzed. It was found that both the concentration and distribution proportion of the raw water containing bromide with high concentration increased, which meant the increase in the concentration of Br-DBPs caused the high concentration of THMs in the water. Sample experiment was carried out to compare the water treatment effect upon the raw water from Tai Lake using liquid chlorine or sodium hypochlorite. The results showed that liquid chlorine was more oxidative than sodium hypochlorite, and adding liquid chlorine would promote the formation of chloroform while the addition of sodium hypochlorite caused an increase in the concentration of bromomethane, dichlorobromomethane and chlorodibromomethane. In general, the concentration of THMs formed by the addition of sodium hypochlorite was higher.