AWWA WQTC65931

The West Basin Municipal Water District maintains a commitment to aggressive water conservation andrecycling programs. This project is a continuation of that commitment and expands the Water RecyclingPlant such that it will conserve over ten billion gallons of imported water annually. This project alsoreduces the impacts of increased disposal of wastewater and provides high quality water that can be safelyreturned to the environment via groundwater injection. The use of re-purified water at the barrierrepresents an innovative method to continue protecting local groundwater resources from seawaterintrusion while conserving California's precious water resources.Ultraviolet (UV) oxidation is an important component for the West Basin Municipal Water DistrictRecycled Water Project (WBWRP). The UV process will provide disinfection plus an additional barrierof photolysis and oxidation of complex compounds like N-nitrosodimethylamine (NDMA) and manyemerging contaminants. This paper summarizes the successful UV strategy for complying with the California Department ofHealth Services (CDHS) draft Groundwater Recharge Reuse regulation, involving reduction of NDMAlevels and addressing trace organics. Specific challenges on procurement, validation and monitoring arepresented with solutions that were derived from three separate projects: WBWRP, Orange County WaterDistrict Groundwater Recharge and Los Angeles County Sanitation District Alamitos Barrier Project.Industry challenges are highlighted to illustrate information needed to optimize the operation of theseprojects. Includes tables, figures.

Product Details

Edition:

Vol. - No.

Published:

11/01/2007

Number of Pages:

10

File Size:

1 file , 570 KB