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Miroslav Colic*1, Dwain Morse1, Wade Morse1, Jan D. Miller2 1Clean Water Technology Inc.

6860 Cortona Dr., Building A

Goleta, CA 93117

Email:; Fax: (805)-685-9105 2University of Utah, Salt Lake City

to be presented at WEFTEC 2005, Washington DC, Session 29, alternate


Solid/liquid separations are commonly the first step in any wastewater treatment. Such technologies are mature and new developments are rare. However, in the last decade some significant improvements in separation techniques for industrial wastewater pretreatment have been implemented. Advances in the technology include more efficient, faster centrifugal mixing of treatment chemicals and wastewater contaminants, ìin situî continuous flow coagulation and flocculation, implementation of very high molecular weight flocculants and development of more efficient flotation technologies. Recent developments and improvements of commonly used dissolved air flotation units along with development and application of centrifugal flotation units, cavitation air flotation and suspended air flotation will be discussed. Case studies are also described. Hybrid centrifugal ñ dissolved air flotation technologies provide the best of both systems: efficient continuous flow mixing and in line flocculation with the nucleation and entrainment of fine dissolved air bubbles. This development has resulted in systems with very efficient removal of particulate contaminants, a small footprint, drier sludge, durable long lasting flocs, fast response and treatment of the total wastewater stream (no recycling characteristic for DAFs). The design of on-line turbidity driven sensors for automatic control of coagulant and flocculant dosage is also underway. Computational fluid dynamics (CFD) has been used to design better flotation tanks with a vortical flow pattern that results in the formation of a dense air bed inside the tank. Such fine bubble layers prevent sedimentation of already floated heavier particulates, which results in significantly higher flotation rates.


Industrial wastewater pretreatment, mixing, flocculation, flotation, sludge thickening


Sedimentation is one of the favorite gravity-separation methods to remove contaminants in water treatment. Most oils have low density and cannot be separated by sedimentation

6860 Cortona Dr. • Goleta, CA 93117 • Phone (805) 685 9100 • Fax (805) 685 9105

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 Supercritical Fluid Extraction 2005-10-new_developments_in_mixing.pdf Page 001
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