Research On The Application Of Electrochemical Oxidation Technology On Wastewater Recycling

Water resources shortage is increasing steadily due to industrial proliferation and urbanization. Electrochemical oxidation technology has extensive application prospects in the field of water treatment for its advantages of good effects, no extra pollutions and easy operation.Electrochemical degradation of an azo dye named methyl orange from simulated wastewater was investigated in different conductive electrolytes, and the possible mechanisms of action with chloride ion were discussed. It is showed that the increase of current density and the concentration of Na₂SO₄ are propitious to the degradation of methyl orange in definite range. First of all, the chromophore was destroyed, then benzene and fatty acid were degraded. So the color disappeared fast rather than the chemical oxygen demand. In the beginning of the degradation process, benzoquinone generated, and then was decompounded by Cl₂/ClO^-.Orthogonal design and uniform design have been used to treat with the wastewater from the second tank and the dyeing factory. The optimum condition can be founded easily through experimental software. Based on it, the outlet wastewater of the second tank was degraded on the ACF-RuO₂/Ti electrode in a designed electrochemical device, in order to accelerating the practical application. The results show that the anode has several functions of completely removing color of the wastewater, reducing greatly COD, and sterilizing. If the concentration of the electrolytes Na₂SO₄ is 0.1mol/L, volumetric flow rate is 2.45cm³/min and the tank voltage reaches 8V, the organic pollutant can be degraded effectively. Here, the COD removal rate is over 80% and the bactericidal rate reaches to 100%.