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UV Disinfection of Dry Weather Creek Flow to Buccaneer Beach

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Loma Alta Creek in Oceanside, CA flows to Buccaneer Beach, and the creek's historical high bacterial concentrations have led to regular beach postings during the summer. To avoid beach closures and to achieve the low organism counts required by the State for public health protection, a filtration and UV disinfection system is being implemented to treat the creek's dry weather flows prior to beach discharge. To properly size and design the disinfection system, water samples were collected from the creek outlet during the dry weather months of 2006, filtered through a cloth disk filter, and analyzed for water quality parameters that are known to impact UV disinfection. Based on the UV transmittance (UVT) measurements of the filtered water, a design UVT of 56% or 50% was recommended for a system with or without redundancy. The test microorganism concentrations of the filtered water were typically above the State Standards. Collimated beam dose-response curves demonstrated that a UV dose of 30 mJ/cm2 would consistently reduce microorganism concentrations below the 30-day average State Standard.
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Keywords: COLLIMATED BEAM DOSE-RESPONSE; PUBLIC BEACH; UV DISINFECTION

Document Type: Research Article

Publication date: 2007-10-01

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