Electrochemical treatment of tannery wastewater using DSA electrodes.
In this work we studied the electrochemical treatment of a tannery wastewater using dimensionally stable anodes (DSA) containing tin, iridium, ruthenium, and titanium. The electrodes were prepared by thermal decomposition of the polymeric precursors. The electrolyses were performed under galvanostatic conditions, at room temperature. Effects of the oxide composition, current density, and effluent conductivity were investigated, and the current efficiency was calculated as a function of the time for the performed electrolyses. Results showed that all the studied electrodes led to a decrease in the content of both total phenolic compounds and total organic carbon (TOC), as well as lower absorbance in the UV-vis region. Toxicity tests using Daphnia similis demonstrated that the electrochemical treatment reduced the wastewater toxicity. The use of DSA type electrodes in the electrochemical treatment of tannery wastewater proved to be useful since it can promote a decrease in total phenolic compounds, TOC, absorbance, and toxicity.
Costa
Carla Regina
CR
Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, SP, Brazil.
Botta
Clarice M R
CM
Espindola
Evaldo L G
EL
Olivi
Paulo
P
D000818:Animals; D002857:Chromium / Q000737:chemistry* / Q000633:toxicity; D003621:Daphnia / Q000187:drug effects / Q000502:physiology; D004553:Electric Conductivity; D004566:Electrodes; D004572:Electrolysis; D007220:Industrial Waste; D008670:Metals / Q000737:chemistry*; D009068:Movement / Q000187:drug effects; D010636:Phenols / Q000737:chemistry* / Q000633:toxicity; D013633:Tanning; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000633:toxicity
D007220:Industrial Waste; D008670:Metals; D010636:Phenols; D014874:Water Pollutants, Chemical; D002857:Chromium; C074702:chromium hexavalent ion