Treatment of Oily Wastes Using High-Shear Rotary Ultrafiltration
Publication: Journal of Environmental Engineering
Volume 123, Issue 12
Abstract
The high-shear rotary ultrafiltration (UF) system uses membrane rotation to provide the turbulence required to minimize concentration polarization and flux decline. The high-shear UF system was effective in concentrating oily wastes from about 5% to as high as 65%. The decoupling of turbulence promotion from feed pressurization/recirculation by rotating the membrane was the primary reason for the improvement in performance over that observed with conventional UF systems. Transitional and gel layer oil concentrations (20% and 50–59%, respectively) were higher than values reported in the literature. Permeate flux was dependent on the temperature and rotational speed. Flux increased by about 45% when the temperature was increased from 43 to 60°C. A larger decrease in waste viscosity, over that predicted for water alone, and increased oil droplet diffusivity were hypothesized as reasons for the stronger than expected flux-temperature relationship. The flux-rotational speed (ω) relationship was described by J=f(ω)0.90; however, the gel layer exhibited stability with increasing ω. The ceramic membrane was superior to the polymeric membrane in regards to permeate flux and quality as well as cleaning and durability.
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Copyright © 1997 American Society of Civil Engineers.
History
Published online: Dec 1, 1997
Published in print: Dec 1997
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