Water Science & Technology: Water Supply Vol 1 No 2 pp 83–90 © IWA Publishing 2001
Effects of pre-ozonation and selected advanced water treatment processes on
Mount Seymour impoundment water
C Bonneville* and DW Smith**
*
EPCOR Water Services, 10065 Jasper Avenue, Edmonton T5J 3B1, Canada
**
Department of Civil and Environmental Engineering, University of Alberta,
304 Environmental Engineering Building, Edmonton T6G 2M8, Canada
ABSTRACT
In May 1999, a project using a dissolved air flotation
(DAF)/ozone/filtration pilot plant was started to study the effects
of pre-ozonation on the flocculation of particles and removal of
organic matter in an advanced treatment process. Results indicate
that small doses of ozone pre-ozonation slightly improve the
flocculation of particles and their subsequent removal in the DAF
unit when used in conjunction with alum or PACl. However, it was
found that high ozone doses impeded flocculation. More significant
is ozone's benefit for the removal of UV-absorbing organic
matter. The study also found that DAF is very effective at removing
turbidity causing particles and colour from the water, thereby
improving filter performance.
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