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.