AWWA ACE56248

Nitrosodimethylamine (NDMA) is an emerging contaminant that, when present, poses health concerns for humans at very low levels and thus should be considered when developing treatment strategies for new water treatment, reclamation, and wastewater treatment facilities. There are other emerging contaminants, such as 1,4 Dioxane that also cause concern in groundwater recharge applications. Currently, the most reliable means of removing NDMA and other organic contaminants from recycled water is with ultraviolet (UV) photolysis. Although UV treatment has proven to be effective in pilot testing of many small systems, a full-scale system has yet to be placed in operation for a municipal recycled water system. This paper addresses the steps taken to implement this maturing technology into the Alamitos Barrier Recycled Water Project, including a discussion of the design criteria, performance evaluation criteria, and enforcement considerations. Includes 2 references, figures.