Pilot scale mineralization of organic acids by electro-Fenton process plus sunlight exposure.
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.
Casado
Juan
J
MATGAS Research Center, Plaza Cívica P12, Universidad Autónoma de Barcelona, 08193 Bellaterra, Barcelona, Spain.
Fornaguera
Jordi
J
Galán
Maria Isabel
MI
D015084:2,4-Dichlorophenoxyacetic Acid / Q000737:chemistry / Q000528:radiation effects; D019817:Benzoic Acid / Q000737:chemistry / Q000528:radiation effects; D011232:Chemical Precipitation; D004572:Electrolysis / Q000379:methods*; D006861:Hydrogen Peroxide / Q000494:pharmacology*; D007501:Iron / Q000494:pharmacology*; D009930:Organic Chemicals / Q000737:chemistry* / Q000528:radiation effects; D019815:Oxalic Acid / Q000737:chemistry / Q000528:radiation effects; D010865:Pilot Projects; D013472:Sunlight; D014865:Waste Disposal, Fluid / Q000379:methods; D018508:Water Purification / Q000379:methods*
C045076:Fenton's reagent; D009930:Organic Chemicals; D015084:2,4-Dichlorophenoxyacetic Acid; D019817:Benzoic Acid; D019815:Oxalic Acid; D006861:Hydrogen Peroxide; D007501:Iron