In situ active chlorine generation for the treatment of dye-containing effluents |
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Authors: | François Zaviska Patrick Drogui Jean-François Blais Guy Mercier |
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Affiliation: | 1.Institut National de la Recherche Scientifique (INRS-Eau Terre et Environnement),Université du Québec,Québec,Canada |
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Abstract: | This study examined the possibility to remove colour causing-compounds from synthetic effluent by indirect electrochemical
oxidation using iridium oxide anode electrodes. Using a high concentration of chloride ions (17.1 mM) and various current
densities, it was possible to produce high concentration of active chlorine with a specific production rate of 2.8 mg min−1 A−1. The best performance for acid methyl violet 2B dye (MV2B) decomposition was obtained using Ti/IrO2 anodes operated at a current density of 15 mA cm−2 during 40 min of treatment in the presence of 3.42 mM of chloride ions. Under these conditions, more than 99% of MV2B was
removed (with a reaction rate apparent constant of 0.20 min−1), whereas COD and TOC removal were 51% and 75%, respectively. The electrolytic cell was then used for the degradation of
three other synthetic dye solutions: Eosin yellowish (EOY), Trypan Blue (TRB), Acridine Orange (ACO). TRB was the most difficult
dye to remove from solution with a value reaction rate constant of 0.12 min−1, compared to 0.19 min−1 and 0.24 min−1 recorded for ACO and EOY dyes, respectively. More than 99% of these dyes were removed by electrochemical oxidation. |
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