Patent ID: 6878268
Filing Date: 2005-04-12
Classification: C02F,Y02W

Abstract:
1. Apparatus for purifying contaminated water containing colloidal particles by coagulating said colloidal particles by a counter-ion effect of a flocculant, and separating said colloidal particles from said water, said apparatus comprising: a coagulation tank for contacting said contaminated water containing said colloidal particles with said flocculant, said flocculant comprising ferric ions, to coagulate said colloidal particles in said contaminated water; an electrolysis tank comprising a pair of electrodes made of a material selected from the group consisting of: stainless steel, platinum, and carbon, for electrolyzing said contaminated water to lower a zeta potential of said colloidal particles in said contaminated water to a negative value, and wherein a negative electrode of said pair of electrodes is coated with a material selected from the group consisting of: titanium, iridium, palladium, platinum, and hafnium; said electrolysis tank being positioned alternatively upstream and downstream of said coagulation tank; a gas mixing tank for mixing carbon dioxide into said contaminated water; and a flotation tank for separating said coagulated colloidal particles from said contaminated water to produce purified water.