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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About This Item
Full Description
This slide presentation outlines information on an annular reactor study on the
effectiveness of ClO<sub>2</sub> in
controlling biological growth
in open-air basins. The objectives of the study included: studying the effectiveness of ClO<sub>2</sub> in controlling
biological growth in open air basins
(HPC, AODC, Chlorophyll-a);
compare Cl<sub>2</sub> and ClO<sub>2</sub>; and,
chlorite, chlorate, bromate, disinfection byproduct
formation. Results of the study include: both continuous and intermittent ClO<sub>2</sub>
potentially at least as effective as Cl<sub>2</sub> in
controlling biological growth;
about 70 µg/L AOX and 25 µg/L TTHM
due to Cl<sub>2</sub> ; TTHM <10 µg/L for ClO<sub>2</sub>; and,
bromate formation below detection limit. Also, a pilot study is discussed that studied the effect of pre-ClO<sub>2</sub> on:
coagulation,
settled turbidity, UV-absorbance, TOC;
ozonation, UV-absorbance, residual ozone, DBP; and,
filtration, particle count, headloss, turbidity.
