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This paper provides a rationale for key assumptions and decisions made to develop the design forthe Ultraviolet (UV) system for the in-plant recycle stream treatment system at the East BayMunicipal Utility District (EBMUD) Walnut Creek 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;design dose for the system is 40 mJ/cm2;acceptable UV systems have 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

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Edition: Vol. - No. Published: 06/15/2003 Number of Pages: 14File Size: 1 file , 2.5 MB