| abstract |
(57) [Summary] [Problem] Conventional water treatment with hydrogen peroxide has insufficient sterilizing power or generates hydrogen peroxide in an alkaline atmosphere, so that metal ions contained as impurities are reduced to metal hydroxide. And the effective area is reduced due to precipitation on the cathode surface. SOLUTION: An oxygen-containing gas is supplied to a cathode 6 to generate hydrogen peroxide, and an inorganic acid is supplied to an anode 5 from an acid solution addition port 4 to generate an oxidation product such as hypochlorous acid. , The treatment of the liquid to be treated is performed with the two compounds. As a result, the sterilizing power is improved, and the vicinity of the cathode surface is maintained from neutral to acidic due to the acidity of the coexisting oxidation product, and the precipitation of metal hydroxide is suppressed. |