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Tannery wastewater was treated by an electrochemical oxidation method using Ti/Pt, Ti/ PbO 2 and Ti/MnO 2 anodes and a Ti cathode in a two-electrode stirred batch reactor. The changes in colour concentration, chemical oxygen demand (COD), ammonia (NH 4 ), sul®de and total chromium have been determined as a function of treatment time and applied current density. Gas chromatography±mass spectrometry (GC±MS) analysis, performed on the wastewater samples before and after treatment, as well as on foam samples, is reported. Anode ef®ciency, rate constants and energy consumption were estimated and discussed. . The order of ef®ciency of anodes was found to be Ti/Pt ) Ti/PbO 2 > Ti/MnO 2 . The results indicate that the electro-oxidation method could be used for effective oxidation of tannery wastewater and a ®nal ef¯uent with substantially reduced pollution load can be obtained.

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