AWWA ACE70582

This powerpoint presentation begins by providing a brief overview of a project by the Contra Costa Water District to: evaluate treatment efficacies of select treatment technologies at pilot scale for the removal of trace organic compounds, including NDMA, EDCs, PPCPs, and pesticides; and, to evaluate subsequent formation of regulated and unregulated disinfection byproducts in a benchtop study. The experimental plan included a literature review and screening sampling, testing of treatment technologies, pilot setup and testing, Trains 1 and 2 - Ozonation and Filtration (5 gpm); and, Train 3 - NF Membranes (20 gpm). Summary and conclusions indicate the following: research completed to understand the effectiveness of existing treatment processes and advanced (future) technologies for trace organics; trace organic compounds selected based upon occurrence, previous studies, and model representation; pilot study completed to evaluate ozone + BAF, ozone/peroxide + BAF, and NF; results show that ozone effectively removes (e90%) most compounds at 1mg/L ozone dose; lower ozone dose provides some removal of trace organics; ozone resistant compounds common to previous studies; ozone/peroxide did not provide additional removal as compared to ozone alone; and, NF effectively removed trace organics, but brine must be treated/disposed. Includes tables, figures.