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Electrochemical oxidation as a final treatment of synthetic tannery wastewater.
Environ Sci Technol. 2004 Oct 15; 38(20):5470-5.ES

Abstract

Vegetable tannery wastewaters contain high concentrations of organics and other chemicals that inhibit the activity of microorganisms during biological oxidations, so biorefractory organics that are not removed by biological treatment must be eliminated by a tertiary or advanced wastewater treatment. In this paper, the applicability of electrochemical oxidation as a tertiary treatment of a vegetable tannery wastewater was investigated by performing galvanostatic electrolysis using lead dioxide (Ti/PbO2) and mixed titanium and ruthenium oxide (Ti/TiRuO2) as anodes under different experimental conditions. The experimental results showed that both the electrodes performed complete mineralization of the wastewater. In particular, the oxidation took place on the PbO2 anode by direct electron transfer and indirect oxidation mediated by active chlorine, while it occurred on the Ti/TiRuO2 anode only by indirect oxidation. Furthermore, the Ti/PbO2 gave a somewhat higher oxidation rate than that observed for the Ti/TiRuO2 anode. Although the Ti/TiRuO2 required almost the same energy consumption for complete COD removal, it was more stable and did not release toxic ions, so it was the best candidate for industrial applications. With the Ti/TiRuO2 anode, the rate of tannery wastewater oxidation increased with the current density, pH, and temperature of the solution. These results strongly indicate that electrochemical methods can be applied effectively as a final treatment of vegetable tannery wastewater allowing the complete removal of COD, tannin, and ammonium and decolorization.

Authors+Show Affiliations

Department of Chemical and Process Engineering, University of Genoa, P le JF Kennedy 1, 16129 Genoa, Italy. marco.panizza@unige.itNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

15543753

Citation

Panizza, Marco, and Giacomo Cerisola. "Electrochemical Oxidation as a Final Treatment of Synthetic Tannery Wastewater." Environmental Science & Technology, vol. 38, no. 20, 2004, pp. 5470-5.
Panizza M, Cerisola G. Electrochemical oxidation as a final treatment of synthetic tannery wastewater. Environ Sci Technol. 2004;38(20):5470-5.
Panizza, M., & Cerisola, G. (2004). Electrochemical oxidation as a final treatment of synthetic tannery wastewater. Environmental Science & Technology, 38(20), 5470-5.
Panizza M, Cerisola G. Electrochemical Oxidation as a Final Treatment of Synthetic Tannery Wastewater. Environ Sci Technol. 2004 Oct 15;38(20):5470-5. PubMed PMID: 15543753.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Electrochemical oxidation as a final treatment of synthetic tannery wastewater. AU - Panizza,Marco, AU - Cerisola,Giacomo, PY - 2004/11/17/pubmed PY - 2005/8/5/medline PY - 2004/11/17/entrez SP - 5470 EP - 5 JF - Environmental science & technology JO - Environ Sci Technol VL - 38 IS - 20 N2 - Vegetable tannery wastewaters contain high concentrations of organics and other chemicals that inhibit the activity of microorganisms during biological oxidations, so biorefractory organics that are not removed by biological treatment must be eliminated by a tertiary or advanced wastewater treatment. In this paper, the applicability of electrochemical oxidation as a tertiary treatment of a vegetable tannery wastewater was investigated by performing galvanostatic electrolysis using lead dioxide (Ti/PbO2) and mixed titanium and ruthenium oxide (Ti/TiRuO2) as anodes under different experimental conditions. The experimental results showed that both the electrodes performed complete mineralization of the wastewater. In particular, the oxidation took place on the PbO2 anode by direct electron transfer and indirect oxidation mediated by active chlorine, while it occurred on the Ti/TiRuO2 anode only by indirect oxidation. Furthermore, the Ti/PbO2 gave a somewhat higher oxidation rate than that observed for the Ti/TiRuO2 anode. Although the Ti/TiRuO2 required almost the same energy consumption for complete COD removal, it was more stable and did not release toxic ions, so it was the best candidate for industrial applications. With the Ti/TiRuO2 anode, the rate of tannery wastewater oxidation increased with the current density, pH, and temperature of the solution. These results strongly indicate that electrochemical methods can be applied effectively as a final treatment of vegetable tannery wastewater allowing the complete removal of COD, tannin, and ammonium and decolorization. SN - 0013-936X UR - https://www.unboundmedicine.com/medline/citation/15543753/Electrochemical_oxidation_as_a_final_treatment_of_synthetic_tannery_wastewater_ L2 - https://doi.org/10.1021/es049730n DB - PRIME DP - Unbound Medicine ER -