A study on the efficiency of the DAF (dissolved air flotation) process using ozone injection

摘要

In this study, dissolved ozone flotation system with injecting ozone directly into a DAF pumpndeveloped was applied to remove turbidity and organic matter for water treatment. This ozonenflotation system was evaluated on the basis of the efficiency of ozone transfer into water and thenremoval efficiency of turbidity and TOC in the Nakdong river water. The DAF pump system foundnto be more efficient than the conventional DAF system injecting ozone directly from a ozonengenerator. The ozone through the DAF pump process was dissolved in water much faster thannthrough the general ozone generator due to the higher mixing efficiency through a pump impellernand high pressure inside the DAF pump. Also, the kinetics of ozone decay injected by the DAFnpump was slower than injected by an ozone generator. The DAF pump flotation system showsnthat 30% difference of removal efficiencies is attained as the ozone dose increases from 1.2 mg/Lnto 8.2 mg/L. And the turbidity removal was increased with increasing ozone dose. Therefore itncan be concluded that ozone in this flotation system facilitates improved removal of organicnmatter and turbidity due to enhanced destabilization of those.