Water Supply Vol 4 No 4 pp 251–254 © IWA Publishing 2004
NOM removal for extension of chlorine dioxide residuals and lower biological regrowth potentials
E. Ring*, M. Samblebe**, M. Leak*** and S. Gray****
*North East Water, PO Box 863, Wodonga, Victoria, 3689, Australia
**North East Water, PO Box 863, Wodonga, Victoria, 3689, Australia
***SA Water, 77 Grenfell Street, Adelaide, 5000
****CSIRO Manufacturing and Infrastructure Technology, PO Box 56, Graham Rd, Highett, 3190, Australia (E-mail: stephen.gray@csiro.au)
ABSTRACT
Techniques to decrease the rate of chlorine dioxide (ClO2) decay in a treated water from Whitfield, Australia were investigated. Biofiltration, microfiltration (MF) and ultrafiltration (UF) were considered as possible means of removing organic compounds which react with the ClO2. Membrane filtration removed more organic material than biofiltration, but biofiltration led to greater ClO2 durations and lower biological regrowth potentials than MF or UF. The results indicated that biofiltration was able to preferentially remove the fast reacting component of organic material that led to rapid ClO2 decay and also lowered the biological regrowth potential of the water.
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