Full Description

The Washington Suburban Sanitary Commission (WSSC) retained O'Brien and Gere Engineers to conduct a study to ensure the continued reliable supply of safe drinking water at one of its water treatment plants serving 3/4th of 1.5 million customers in Maryland. As part of this multi-stage study, feasibility of installing ultraviolet (UV) technology was investigated. For the full-scale trial, Trojan's Swift UV reactor (12-inches in diameter) consisting of medium pressure lamps was employed. The trial, which was conducted in collaboration with Dr. Jim Malley of Environmental Engineering Research, New Hampshire, consisted of ten, weekly MS2 Bacteriophage biodosimetry trials to evaluate impacts of varying water quality on delivered UV dose. In addition, impact of UV on assimilable organic carbon and formation of disinfection byproducts was evaluated. The major findings of the study are summarized as follows: the UV transmittance for the filtered water ranged from 87 to 96 percent, and a design value of 80 percent is recommended for the preliminary design of the reactors, and depending on controlled lamp power, the UV dose ranged from 27 to 43 mJ/cm2; collimated beam experiments with MS2 Bacteriophage resulted in excellent inactivation kinetic data; based on ten separate biodosimetry experiments, no significant fouling of sleeves was observed; UV treatment of filtered water did not impact either assimilable organic carbon (AOC) or total organic carbon (TOC) levels; UV treatment of filtered water did not impact the formation of disinfection byproducts; over the ten-week trial period, lamp age did not impact the performance of the UV reactor. Includes 13 references, table, figures.

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Edition: Vol. - No. Published: 06/16/2002 Number of Pages: 11 File Size: 1 file , 350 KB