Patent ID: 7686933

Claim:
An apparatus for purifying an oil-based fluid comprising: an electrically charged housing having a housing floor and a plurality of walls containing a contaminated oil-based fluid; an oppositely charged rotatable cylindrical drum having a drum outer surface retained a drum height above the housing floor and contacting the contaminated oil-based fluid; a means for rotating the cylindrical drum while the cylindrical drum is contacting the contaminated oil-based fluid; a nonconductive scraper head contacting the drum outer surface to remove contaminants collected thereon while the cylindrical drum is rotating and contacting the contaminated oil-based fluid, wherein the scraper head is positioned between the contaminants to be removed from the drum outer surface and the housing; wherein the cylindrical drum can be selectively raised or lowered to adjust the drum height; and wherein the housing floor is shaped to complement the cylindrical drum.