Electrochemical oxidation of tannery wastewater

• Published in: Journal of chemical technology and biotechnology (1986) 2001, Vol.76 (11), p.1124-1131
• Main Authors: Rao, N N, Somasekhar, K M, Kaul, S N, Szpyrkowicz, L
• Format: Article
• Language: English
• Subjects: Applied sciences; electro-oxidation; Exact sciences and technology; Industrial wastewaters; Pollution; tannery; Ti/MnO2-electrodes; Ti/PbO2; Ti/Pt; Ti/Pt‐, Ti/PbO2‐, Ti/MnO2‐electrodes; wastewater; Wastewaters; Water treatment and pollution
• ISSN: 0268-2575; 1097-4660
• DOI: 10.1002/jctb.493

Tannery wastewater was treated by an electrochemical oxidation method using Ti/Pt, Ti/PbO2 and Ti/MnO2 anodes and a Ti cathode in a two‐electrode stirred batch reactor. The changes in colour concentration, chemical oxygen demand (COD), ammonia (NH4+), sulfide 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 efficiency, rate constants and energy consumption were estimated and discussed. The efficiency of Ti/Pt was 0.802 kgCOD h−1 A−1m−2 and 0.270 kgNH4+ h−1 A−1m−2, and the energy consumption was 5.77 kWh kg−1 COD and 16.63 kWh kg−1 of NH4+. The order of efficiency of anodes was found to be Ti/Pt ≫ Ti/PbO2 > Ti/MnO2. The results indicate that the electro‐oxidation method could be used for effective oxidation of tannery wastewater and a final effluent with substantially reduced pollution load can be obtained. © 2001 Society of Chemical Industry