[Oxidation treatment of formaldehyde-containing wastewater by electro-Fenton method].
The mechanisms of affecting factors in treating formaldehyde-containing organic wastewater by electro-Fenton reactor which had granular carbon as the filled electrode were investigated. The optimal operating conditions determined by orthogonal experiments and individual factor experiments were as following: 90 min, 25 V, 30 degrees C-40 degrees C, insulating carbon content 40%, Fe2+ concentration 300 mg/L at pH < 3.5. Formaldehyde degradation mechanisms were proposed after analyzing the oxidation products with UV absorbance spectrum. Experiment of treating the actual wastewater using this method were also performed. The removal rates of formaldehyde and CODCr were about 90%, 30%, respectively. In addition, the operating cost was 42.3% less than that of treatment by Fenton method.
Hu
Chengsheng
C
Environmental Science Institute, South China University of Technology, Guangzhou 510640, China.
Wang
Gang
G
Wu
Chaofei
C
Li
Ping
P
Wei
Chaohai
C
D004563:Electrochemistry; D005557:Formaldehyde / Q000302:isolation & purification* / Q000378:metabolism; D006861:Hydrogen Peroxide; D006863:Hydrogen-Ion Concentration; D007501:Iron; D010084:Oxidation-Reduction; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*
C045076:Fenton's reagent; D005557:Formaldehyde; D006861:Hydrogen Peroxide; D007501:Iron