Abstract
Solvent sublation is a unique bubble-separation method which combines features of foam fractionation and solvent extraction in a single unit operation. Surfactant introduced into a flotation column serves to remove emulsions and other colloids, while simultaneously transporting dissolved organics into a solvent layer for retention. The extracting solvent is placed directly on the surface of the aqueous phase. The objective of this research was to test the feasibility of using the solvent sublation process to remove phenols and particulates from underground coal gasification (UCG) wastewater. Previous work with separate flotation, adsorption, solvent extraction and coagulation processes indicated that a combined approach might have added utility in increasing pollutant removal. Further, the combined process could have greater efficiencies of operation. All experiments were performed in the batch mode using methylisobutyl ketone (MIBK) solvent and ethylhexadecyldimethylammonium bromide (EHDA-Br) surfactant....
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