常规水处理过程中的卤乙酸浓度控制

对北方某自来水厂常规水处理过程及饮用水体中的4种卤乙酸质量浓度进行了调查,结果表明水体中只存在二氯乙酸和三氯乙酸,其中三氯乙酸所占比例较大,为52%~90%;常规水处理工艺对二氯乙酸有较为明显的去除效果,去除率在15%以上,而对三氯乙酸没有明显的去除效果,但总体而言其对卤乙酸有10%左右的去除率;预氯化对卤乙酸的产生起主导性作用,该处产生的卤乙酸占整个氯化过程产生的卤乙酸总量的60%以上,因此常规工艺有必要从预氯化工艺着手加以改进,来更好的控制卤乙酸的产生量。

Concentration of haloacetic acids during conventional water treatment process

The investigation on the concentration of four haloacetic acids(HAAS) during conventional water treatment process in waterworks and in drinking waters in North China showed that there were only dichloroacetic acids(DCAA) and trichloroacetic acids(TCAA) in waters,and the proportion of TCAA was from 52% to 90%.The conventional treatment process has an obviously removal effect on DCAA,more than 15%,but has little removal effect on TCAA.In general,it has about 10% removal efficiency on total HAAS.Prechlorination may result in a great increase of HAAS in conventional treatment process,and the HAAS in the process count about 60% of the total HAAS.In the conventional process,the prechlorination process should be improved for better control of the production of HAAS.