Importance of H(2)O(2)/Fe(2+) ratio in Fenton's treatment of a carpet dyeing wastewater.
The effectiveness of the Fenton's reagent (H(2)O(2)/Fe(2+)) in the treatment of carpet dyeing wastewater was investigated under different operational conditions, namely, H(2)O(2) and FeSO(4) concentrations, initial pH and temperature. Up to 95% COD removal efficiency was attained using 5.5 g/l FeSO(4) and 385 g/l H(2)O(2) at a pH of 3, temperature of 50 degrees C. The H(2)O(2)/Fe(2+) ratio (g/g) was found to be between 95 and 290 for maximum COD removal. It was noteworthy that, keeping H(2)O(2)/Fe(2+) ratio constant within the range of 95-290, it became possible to decrease FeSO(4) concentration to 1.1 g/l and H(2)O(2) concentration to 96.3 g/l, still achieving nearly the same COD removal efficiency. The relative efficiencies of Fenton's oxidation and coagulation stages revealed that Fenton's coagulation removed organic compounds which were not removed by Fenton's oxidation, indicating that the Fenton's coagulation acted as a polishing step.
Gulkaya
Ipek
I
Middle East Technical University, Environmental Engineering Department, 06531 Ankara, Turkey.
Surucu
Gulerman A
GA
Dilek
Filiz B
FB
D004396:Coloring Agents / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D007220:Industrial Waste / Q000032:analysis*; D007501:Iron; D016877:Oxidants / Q000032:analysis*; D010100:Oxygen / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D013696:Temperature; D014865:Waste Disposal, Fluid
D004396:Coloring Agents; C045076:Fenton's reagent; D007220:Industrial Waste; D016877:Oxidants; D006861:Hydrogen Peroxide; D007501:Iron; D010100:Oxygen