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

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• 作者：Iranildes D. Santos^a ; ^{isantos@metalmat.ufrj.br} ; Má ; rcia Dezotti^b ; Achilles J.B. Dutra^a
• 关键词：Ti/RuO2 anode ; Saline medium ; Petroleum industry and COD removal
• 刊名：Chemical Engineering Journal
• 出版年：2013
• 出版时间：15 June, 2013
• 年：2013
• 卷：226
• 期：Complete
• 页码：293-299
• 全文大小：796 K

文摘

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 120 min of electrolysis, with a current density of 10 mA cm^?2, anodic area of 107 cm², flow rate of 0.54 mL s^?1 and at 25 ¡ãC, were above 96 % , for effluent AF (After Flotation), with 712 mg L^?1 COD, and 87 % for effluent BF (Before Flotation), with 833 mg L^?1 COD. An almost complete COD removal from both effluents was achieved when current density was increased from 10 to 30 mA cm^?2 with anodic area of 107 cm², flow rate of 0.54 mL s^?1 and at 25 ¡ãC. 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 60 min with a current density of 30 mA cm^?2 with anodic area of 107 cm², flow rate of 0.54 mL s^?1 and at 25 ¡ãC was around US$ 38/kg COD, while for effluent AF, the energy cost for total COD removal after 30 min of electrolysis at a current density of 30 mA cm^?2 was only US$ 28/kg COD.