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Abstract

An electrolytic flotation system for purifying waste water includes plurality of planar electrodes in a flotation tank. The electrodes are arranged to distribute the production of microbubbles uniformly throughout a large region of a flotation zone resulting in a uniform non-turbulent flow path between the inlet and outlet of the tank. Consequently, highly efficient removal of impurities is obtained with a relatively low detention time. The electrolytic flotation system also includes a tapered float concentration zone for separating the float from the waste water and a sump region for separating settled sludge from the waste water. The electrolytic flotation system utilizes rapid current reversal at low amp density. The rapid current reversal in the electrolytic flotation system allows the use of stainless steel electrodes without the need for noble metal coatings. Using this technique, the polarity of the current is reversed approximately every six to twelve seconds, preventing the destruction of the anodes due to the dissolution of metal oxide into the waste water. Rather, when the current is reversed, the oxide is converted back into the unoxidized metal and thus is not lost in the waste water.

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