Organic micropollutants and disinfection byproducts removal from drinking water using concurrent anion exchange and chlorination process

Many traditional drinking water treatment processes have limited removal efficiencies on natural organic matter (NOM) and organic micropollutants (OMPs), and thus may lead to the production of harmful disinfection byproducts (DBPs). We examined four kinds of anion exchange resins (D205, D213, NDMP-3, and M80) in conjunction with chlorination in the treatment of drinking water. Five categories including 40 OMPs at environmentally relevant concentrations were analyzed. M80 showed the best performance to remove OMPs in water. However, it was vulnerable to the presence of humic acid (HA), indicating its limitation on removing OMPs and NOM at the same time. In contrast, D205, D213, NDMP-3 resins were less affected by HA. Besides, D205, D213 and NDMP-3 provided higher efficiencies on the reduction of DBPs than M80. The amount of trihalomethanes (THMs) lowered by 42.7%, 37.6%, 32.1%, and 0%, whereas haloacetic acids (HAAs) were decreased by 34.0%, 31.2%, 23.0%, and 17.9% by D205, D312, NDMP-3, and M80. Notably, D205 showed the highest removal effects on the bromide ion, brominated THMs, and HAAs, supporting that D205 can be a selective resin for the treatment of drinking water in high bromide-containing areas. (C) 2020 Elsevier B.V. All rights reserved.

Automated summary

The study found that M80 resin has the best removal efficiency for OMPs in drinking water treatment, but it is vulnerable to the presence of humic acid. In contrast, D205, D213, and NDMP-3 resins are less affected by humic acid. Additionally, D205 has the highest efficiency in reducing DBPs and can be a selective resin for areas with high bromide content in drinking water treatment.