Reprint of: Electrochemical oxidation of stabilized landfill leachate on DSA electrodes

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• 作者：Elisabetta Turro^a ; Apostolos Giannis^b ; Raffaello Cossu^a ; Evangelos Gidarakos^b ; Dionissios Mantzavinos^b ; Alexandros Katsaounis^c ; ^{alex.katsaounis@chemeng.upatras.gr}
• 关键词：Effluent ; Electrolysis ; Landfill ; Operating factors ; Ti/IrO2&ndash ; RuO2
• 刊名：Journal of Hazardous Materials
• 出版年：2012
• 期刊代码：50_03043894
• 类别：ce
• 出版时间：15 March, 2012
• 卷：207-208
• 期：Complete
• 页码：73-78
• 文件大小：1224 K

摘要

The electrochemical oxidation of stabilized landfill leachate with 2960 mg L^鈭? chemical oxygen demand (COD) over a Ti/IrO₂-RuO₂ anode was investigated in the presence of HClO₄ as the supporting electrolyte. Emphasis was given on the effect of electrolysis time (up to 240 min) and temperature (30, 60 and 80 掳C), current density (8, 16 and 32 mA cm^鈭?), initial effluent's pH (0.25, 3, 5 and 6), HClO₄ concentration (0.25 and 1 M) and the addition of NaCl (20 and 100 mM) or Na₂SO₄ (20 mM) as source of extra electrogenerated oxidants on performance; the latter was evaluated regarding COD, total carbon (TC), total phenols (TPh) and color removal. Moreover, the anode was studied by scanning electron microscopy and cyclic voltammetry. The main parameters affecting the process were the effluent's pH and the addition of salts. Treatment for 240 min at 32 mA cm^鈭? current density, 80 掳C and the pH adjusted from its inherent value of 0.25 (i.e. after the addition of HClO₄) to 3 yielded 90%COD, 65%TC and complete color and TPh removal at an electricity consumption of 35 kWh kg^鈭? COD removed. Comparable performance (i.e. 75%COD reduction) could be achieved without pH adjustment but with the addition of 100 mM NaCl consuming 20 kWh kg^鈭? COD removed.