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This paper provides rationale for key assumptions and decisions made in developing the design for the ultraviolet (UV) disinfection system for the in-plant recycle stream treatment system at the East Bay Metropolitan Urban District (EBMUD) Walnut Creek Direct Filtration Water Treatment Plant (WTP). Results of the analysis are as follows: Cryptosporidium is the target pathogen for UV inactivation in the recycle stream; free-swimming pathogens are the basis of UV dose selection; and,design dose for the system is 40 mJ/cm2; acceptable UV systems have attributes that include validated UV dose and UV sensor response, closed-vessel configuration, andmechanical cleaning of quartz sleeves and UV sensor probes; UV transmittance of 85% (254 nm and 10 mm pathlength); approximate capital cost of $1.1 million for current conditions; and, approximate O discuss attributes of acceptable UV systems; develop UV disinfection system configuration and layout; and,present estimates for capital and operational costs. The following are the general performance goals of the UV disinfection system: provide inactivation of Cryptosporidium and other chlorine-resistant pathogens in in-plant recycle streams; and,provide reliable UV equipment, systems, and operational strategies. Includes tables, figures.

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Edition: Vol. - No. Published: 06/16/2002 Number of Pages: 16File Size: 1 file , 2.6 MB