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City of Santa Barbara/Carollo Engineers, California
Pilot-Scale Testing of Ozone and Activated Carbon for DBP
Reduction

 


 

Two factors, one certain, and the other completely unexpected have prompted the extensive pilot study of the pre-ozonation and treatment alternatives at the City of Santa Barbara Cater Water Filtration Plant. The challenge of the scheduled enforcement of the Stage 2 Disinfectant/ Disinfection By-Products Rule (D/DBPR) was compounded by the massive Zaca wildfire of summer 2007. The goal of meeting Stage 2 D/DBPR requirements was made more difficult by the increase of the total organic carbon (TOC) in the water caused by the ash and debris from the wildfire that washed down into the City's reservoirs. The City retained the services of Carollo Engineers and WQTS to evaluate treatment processes that can reduce the levels of disinfection by-products formed in the distribution system. During a five-month pilot study conducted by WQTS staff, pre-ozonation was evaluated with a variety of chemical treatments, including powdered activated carbon and a number of coagulants. The pilot study provided the City with a range of treatment alternatives including optimized chemical dosages for minimizing DBP formation and compliance with the requirements of the Stage 2 D/DBPR.

 
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