Patent ID: 8211290
Filing Date: 2012-07-03
Classification: C02F

Abstract:
1. A method for removing impurities from waste water by electroflotation, the method comprising the steps of: passing the waste water to be cleaned through an electrolytic cell ( performing electrolysis between the two electrodes ( automatically controlling the cell current to obtain a controlled electric field in the cell; effecting in the cell in the controlled electric field a desired oxidation reduction reaction for removing one or more designated impurities from water to be cleaned; feeding the mass flow from the cell to a separation tower ( using coaxial pipes as electrodes, the coaxial pipes defining an uninterrupted, generally cylindrical electrolysis space in the cell through which the hydrogen gas raises the floc along a generally linear path that is not interrupted by structural elements that cause mixing in the cell so the hydrogen gas raises the floc through the electrolysis space without mixing the floc with the purified water so as to allow the formation of the floc, the inner electrode pipe being the more electronegative electrode ( feeding flush water intermittently, during wash cycles, through the inner electrode pipe by pressure for producing flush water sprays through the holes against inner surface of the outer electrode pipe.