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Pilot scale mineralization of organic acids by electro-Fenton process plus sunlight exposure
Juan Casado1, Jordi Fornaguera, Maria Isabel Galán
1MATGAS Research Center, Plaza Cívica P12, Universidad Autónoma de Barcelona, 08193 Bellaterra, Barcelona, Spain.
Abstract:
The viability of the electro-Fenton degradation of aqueous solutions of benzoic acid, 2,4-dichlorophenoxyacetic acid and oxalic acid has been studied at 20 A using a pilot flow reactor containing an anode and an oxygen diffusion cathode, both of 100 cm(2) section. Pollutants were preferentially oxidized by hydroxyl radicals formed in solution from reaction of Fe(2+) with electrogenerated H(2)O(2), allowing mineralization of benzoic acid and 2,4-D. For oxalic acid no electrochemical mineralization was observed. After electrolysis, samples of the different effluents were exposed to sunlight (Helielectro-Fenton process) and almost complete mineralization was reached after ca. 30-50 min without additional cost. Effects of parameters such as electrolysis time, pH and solar irradiation time on the process efficiencies were studied.
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