AWWA WQTC62367

AWWA WQTC62367 Effectiveness of Chlorine Dioxide in Controlling Biofouling and its Impact on Subsequent Treatment Processes

Conference Proceeding by American Water Works Association, 11/01/2005

Alam, M.Z.B.; Cantwell, R.; Rand, J.; Hofmann, R.; Andrews, R.C.; Gagnon, G.; VanderMarck, M.

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This slide presentation outlines information on an annular reactor study on theeffectiveness of ClOsub2/sub incontrolling biological growthin open-air basins. The objectives of the study included: studying the effectiveness of ClOsub2/sub in controllingbiological growth in open air basins(HPC, AODC, Chlorophyll-a);compare Clsub2/sub and ClOsub2/sub; and,chlorite, chlorate, bromate, disinfection byproductformation. Results of the study include: both continuous and intermittent ClOsub2/subpotentially at least as effective as Clsub2/sub incontrolling biological growth;about 70 g/L AOX and 25 g/L TTHMdue to Clsub2/sub ; TTHM 10 g/L for ClOsub2/sub; and,bromate formation below detection limit. Also, a pilot study is discussed that studied the effect of pre-ClOsub2/sub on:coagulation,settled turbidity, UV-absorbance, TOC;ozonation, UV-absorbance, residual ozone, DBP; and,filtration, particle count, headloss, turbidity.

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