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DSA electrochemical treatment of olive mill wastewater on Ti/RuO2 anode

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Abstract

The electrochemical oxidation of olive mill wastewater (OMW) over a Ti/RuO2 anode was studied by means of cyclic voltammetry and bulk electrolysis and compared with previous results over a Ti/IrO2 anode. Experiments were conducted at 300–1,220 mg L−1 initial chemical oxygen demand (COD) concentrations, 0.05–1.35 V versus SHE and 1.39–1.48 V versus SHE potential windows, 15–50 mA cm−2 current densities, 0–20 mM NaCl, Na2SO4, or FeCl3 concentrations, 80 °C temperature, and acidic conditions. Partial and total oxidation reactions occur with the overall rate being near first-order kinetics with respect to COD. Oxidation at 28 Ah L−1 and 50 mA cm−2 leads to quite high color and phenols removal (86 and 84%, respectively), elimination of ecotoxicity, and a satisfactory COD and total organic carbon reduction (52 and 38%, respectively). Similar performance can be achieved at the same charge (28 Ah L−1) using lower current densities (15 mA cm−2) but in the presence of various salts. For example, COD removal is less than 7% at 28 Ah L−1 in a salt-free sample, while addition of 20 mM NaCl results in 54% COD reduction. Decolorization of OMW using Ti/RuO2 anode seems to be independent of the presence of salts in contrast with Ti/IrO2 where addition of NaCl has a beneficial effect on decolorization.

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Authors and Affiliations

  1. Department of Environmental Engineering, Technical University of Crete, Polytechneioupolis, 73100, Chania, Greece

    N. Papastefanakis, D. Mantzavinos & A. Katsaounis

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  1. N. Papastefanakis
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  2. D. Mantzavinos
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  3. A. Katsaounis
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Correspondence to A. Katsaounis.

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Papastefanakis, N., Mantzavinos, D. & Katsaounis, A. DSA electrochemical treatment of olive mill wastewater on Ti/RuO2 anode. J Appl Electrochem 40, 729–737 (2010). https://doi.org/10.1007/s10800-009-0050-9

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  • DOI: https://doi.org/10.1007/s10800-009-0050-9

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