We investigated the efficiency of an advanced water treatment to remove bromide ions and their associated disinfection by-products. The results of the jar test showed that the formation potential of bromodichloromethane, dibromochloromethane, bromoform, total trihalomethane, bromochloroacetic acid, bromodichloroacetic acid, dibromochloroacetic acid, bromoacetic acid, dibromoacetic acid, and tribromoacetic acid were reduced with by coagulation. Coagulation treatment was shown to have the removal effect on disinfection by-products caused by bromide ions. Our plant experiments showed that the formation potential of dibromochloromethane, bromoform, total trihalomethane, dibromochloroacetic acid, dibromoacetic acid, and tribromoacetic acid were reduced by ozonation and granular activated carbon (GAC) treatment. However, the bromide ion and bromate ion generated by ozonation were not removed by GAC treatment. It is necessary to perform measures such as adjusting the ozone injection rate when the raw water is contaminated by bromide ions.

View full abstract

[in Japanese]

View full abstract