Electrochemical treatment of effluents from petroleum industry using a Ti/RuO2 anode

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[1] Santos, Iranildes D.
[2] Dezotti, Márcia
[3] Dutra, Achilles J.B.
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Santos, I.D. (isantos@metalmat.ufrj.br) | 1600年 / Elsevier B.V., Netherlands卷 / 226期
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In this paper the efficiency of Ti/RuO2 anode in degrading organic substances; present in wastewaters from petroleum industry; before their discharge or reuse was investigated. Results indicated that the Ti/RuO2 electrode can be an efficient alternative for treatment of those effluents. The COD (Chemical Oxygen Demand) removals; after 120min of electrolysis; with a current density of 10mAcm-2; anodic area of 107cm2; flow rate of 0.54mLs-1 and at 25°C; were above 96%; for effluent AF (After Flotation); with; 712mgL-1; COD; and 87% for effluent BF (Before Flotation); with 833mgL-1 COD. An almost complete COD removal from both effluents was achieved when current density was increased from 10 to 30mAcm-2 with anodic area of 107cm2; flow rate of 0.54mLs-1 and at 25°C. The increase of current density also favored a decrease of the electrolysis time necessary to achieve a complete COD removal from both effluents; BF and AF. However; current density increase also led to a higher specific energy consumption. For effluent BF; the cost of the energy necessary to achieve a complete COD removal in 60min with a current density of 30mAcm-2 with anodic area of 107cm2; flow rate of 0.54mLs-1 and at 25°C was around US$ 38/kg COD; while for effluent AF; the energy cost for total COD removal after 30min of electrolysis at a current density of 30mAcm-2 was only US$ 28/kg COD. © 2013 Elsevier B.V;
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