Removal of organic pollutants from industrial wastewater by electrogenerated Fenton's reagent.
This study was performed to investigate the treatment of an industrial wastewater mainly containing naphthalene- and anthraquinone-sulphonic acids, by electrogenerated Fenton's reagent. The hydrogen peroxide was produced in situ by electrochemical reduction of oxygen on graphite-felt cathodes and the Fe2+ ions were also regenerated by cathodic reduction of Fe3+. The influence of cathode potential, Fe2+ concentration and electrode surface pre-treatment on chemical oxygen demand (COD) removal and colour fading were studied. Results indicated that the higher COD removal was obtained in the presence of 3 mM of ferrous ions working at a constant potential of -1 V vs. SCE. Moreover, it was shown that both chemical and electrochemical pre-treatments of the cathode surface resulted in a decrease of COD depletion.
Panizza
M
M
Dipartimento di Ingegneria Chimica e di Processo, P.le J. F. Kennedy 1, Genova, Italy. ici-corr@unige.it
Cerisola
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G
D000880:Anthraquinones / Q000737:chemistry; D004563:Electrochemistry; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007220:Industrial Waste; D007501:Iron / Q000737:chemistry*; D009281:Naphthalenes / Q000737:chemistry; D009930:Organic Chemicals; D010100:Oxygen / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods*
D000880:Anthraquinones; C045076:Fenton's reagent; D007220:Industrial Waste; D009281:Naphthalenes; D009930:Organic Chemicals; C031721:naphthalene; C023554:anthraquinone sulfonate; D006861:Hydrogen Peroxide; D007501:Iron; D010100:Oxygen