Nitrosamines are an emerging class of disinfection by-products (DBPs) of health and regulatory concern. The U.S. Environmental Protection Agency (EPA) is considering regulating nitrosamines as part of the six-year review of the Stage 2 DBP Rule. Precursors for nitrosamines include treated wastewater discharges in the watershed and certain polymers (polyDADMAC, polyamine) used as coagulant aids. Nitrosamines are preferentially formed by chloramines. Jointly funded by the Water Research Foundation and the EPA, the objective of
was to develop improved strategies for minimizing nitrosamine formation during drinking water treatment and to develop treatment guidance for utilities. This Webcast focused on the following areas of research: (1) polymer management and removing nitrosamine precursors with powdered or granular activate carbon, (2) pretreatment strategies (with chlorine, ozone, and UV irradiation) for the destruction/transformation of nitrosamine precursors, and (3) case studies on nitrosamine formation and control at full-scale drinking water treatment plants. The final report for this project is now available on the website.