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. © 2006 Elsevier Ltd. All rights reserved.
- Electrochemical mineralization
- Organic acids
- Pilot reactor
- Wastewater treatment