WWRC 91-10
Use of Direct Viable Count Methodology With Ozonation in Drinking Water
Abstract
Viable cells were detected by direct viable count methodology on ozonated
anthracite taken from an active dual media rapid sand filter. Also, at least
a thousand fold more cells were determined to be viable by direct viable
count methodology than by the heterotrophic plate count in raw water
which had been exposed to ozone. This suggests that bacterial cells were
not killed as quickly by ozone as previously thought, and that the direct
viable count may have a place in assessing the effectiveness of killing
bacteria by ozone. Problems were encountered in determining nutrient
responsive cells which could result in errors in the direct viable count.
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