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This paper discusses research at the Greater Cincinnati Water Works (GCWW) to determine cytotoxicity and genotoxicity associated with medium pressure and low pressure ultraviolet (UV) disinfection, and pre- and post-UV chlorination. The experimental approach used post-granular activated carbon (GAC) water from GCWW's full-scale treatment process for the pilot influent. The study used a 55 gpm pilotunit consisting of a single lamp medium pressure reactor (MP, model PMT ISO D1/3) and a 6-lamp low pressure reactor (LP, model ALT230) from Aquionics. There were two phases to the experiment. In the first phase, chlorine was addedafter the reactors. Samples were collected after the reactors and then dosedwith chlorine bleach and sodium hydroxide to obtain a free chlorine residual of1.5 mg/L and a pH of 8.6. The chemical dosing was completed in a manner tomimic normal plant operation. These samples were then held for three days in aconstant water bath to simulate the distribution system. In the second phase,chlorine bleach was applied to the pilot unit prior to the reactors. Chlorinatedsamples were collected after the reactors and adjusted to a pH of 8.6 withsodium hydroxide. These samples were also held for three days in a constantwater bath to simulate the distribution system. After the three days, all of thesamples were extracted through XAD resin and concentrated. Includes 4 references, table, figures.

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Edition: Vol. - No. Published: 11/01/2009 Number of Pages: 7File Size: 1 file , 880 KB