Oxidation Treatment of Chelate Waste Water by Combined Electrolysis and Photocatalysis.

The wet oxidation treatment of catechol and ethylenediamine was carried out. The combination of electrolysis with photocatalysis method was adopted, for these compounds can complexate easily as ligand with heavy metals and it is very difficult to treat complex compounds formed. TOC measurement showed that the waste water contained catechol only was oxidized by the combination method more efficiently than by electrolysis, photocatalysis or the combination method of electrolysis with photolysis. The same result was obtained for the waste water of cathecol contained copper or cadmium, and that of ethylenediamine contained copper. It was suggested for the acceleration effect that the combination of electrolysis with photocatalysis method could produce new active oxidizer and increase the oxidation rate to promote the decomposition of the organic compounds.