Transcription of Developments in Dissolved Air Flotation for Drinking Water ...
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Developments in Dissolved Air Flotation for Drinking Water ...
Developments of High Rate Dissolved Air Flotation for Drinking Water Treatment James K. Edzwald Department of Civil and Environmental Engineering University of Massachusetts Amherst, MA 01003 USA ABSTRACT In recent years there have been large increases in the hydraulic loading rates used to design Dissolved air Flotation (DAF) facilities for Drinking Water applications. High rate DAF processes are now available at loading rates of 20 to 40 m h-1. These high rate systems have a smaller plant footprint compared to conventional systems. The paper examines bubble and floc-bubble rise rates, and how the simple theory relating these rise rates to the hydraulic loading of the DAF separation zone is inadequate. It is shown that in some high rate systems, the flow through the separation zone is stratified and must be accounted for in relating separation zone efficiency to the hydraulic loading and bubble or floc-bubble rise rates.
Figure 1 is a process schematic diagram for a DAF drinking water plant. Coagulation and flocculation are required pretreatment processes. Coagulation is a chemical addition step.
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