Abstract
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.
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