WWRC 89-42
Effectiveness of Killing Bacteria on Rapid Sand Filter Material by Ozonation as Measured by the Direct Viable Count
Abstract
The direct viable count was successfully applied to ozonated raw water and ozonated anthracite taken from an active dual
media rapid sand filter. Increased incubation time resulted in greater numbers of nutrient responsive cells. The direct
viable count was greater than the heterotrophic bacterial plate count. Certain cells of the natural flora could be confused
with nutrient responsive cells in some instances.
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