Mixed Liquor Solids Separation by Flotation

by Michael C. Mulbarger, Engr.-in-Charge; Manassas Field Station, Municipal Treatment Res. Program, Adv. Waste Treatment Res. Lab., Federal Water Quality Admin., U.S. Dept. of the Interior, Manassas, VA,
Donald D. Huffman, (A.M.ASCE), Civ. Engr.—Plant Superintendent; Greater Manassas Sanitary Dist., Prince William County, VA,

Serial Information: Journal of the Sanitary Engineering Division, 1970, Vol. 96, Issue 4, Pg. 861-871

Document Type: Journal Paper


A full-scale dissolved air flotation unit, designed for solids-liquid separation of an activated sludge mixed liquor, was evaluated in a field investigation. The data indicate that conventional design parameters do not predict flotation performance in terms of effluent suspended solids. A new parameter was developed and is proposed as a rational design guideline. Performance of the unit is discussed in terms of float detention time and process design. Cost-quality comparisons of flotation versus gravity sedimentation with waste sludge thickening indicate that overall plant performance could have been improved for a substantial economic savings.

Subject Headings: Field tests | Parameters (statistics) | Dissolved gases | Activated sludge | Effluents | Turbidity | Solid mechanics | Comparative studies

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