Lecture 6

Armenante njit dissolved air flotation continued in

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Unformatted text preview: ed within the bulk of the wastewater PIERO M. ARMENANTE NJIT Dissolved Air Flotation (continued) • In the flotation unit the solid particles are carried by the bubbles toward the surface of the water where they are skimmed off by a skimming mechanism • The clarified water passes under a baffle (which prevents the floating solids from being discharged with the effluent water) and is discharged by passing over a weir • Flotation units can be provided with a recycle to prevent the incoming solids to be subjected to the shearing action of the pressurizing pump PIERO M. ARMENANTE NJIT Dissolved Air Flotation Process without Recycle Sludge Skimmer Pressure Reducing Valve Flotation Unit Incoming Wastewater Clarified Wastewater Air Additives PIERO M. ARMENANTE NJIT Pressurizing Pump Retention Tank Dissolved Air Flotation Process with Recycle Sludge Skimmer Incoming Wastewater Pressure Reducing Valve Flotation Unit Effluent Tank Air Pressurizing Pump Additives PIERO M. ARMENANTE NJIT Retention Tank Clarified Wastewater Design of Dissolved Air Flotation Units Although a theoretical analysis based on the rising velocity of bubble-solid particles is possible (similar to that used for gravity thickener design) floating thickeners are largely designed using empirical...
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