Regeneration and reuse of iron catalyst for Fenton-like reactions.
Fenton and Fenton-like reactions employed for oxidative treatment of a typical industrial wastewater generate a large amount of ferric hydroxide sludge which has to be properly disposed at a high cost. This paper presents a simple and cost-effective method for recovering the iron catalyst from the iron hydroxide sludge for oxidative treatment of industrial wastewaters. The sludge was dewatered, dried and baked at 350-400 degrees C for 20-30 min; the residual solids were dissolved in sulfuric acid to form the reusable catalyst for Fenton and Fenton-like reactions. The recovered catalyst was highly effective for the oxidative pretreatment of a fine chemical wastewater to improve its biodegradability; the resulting COD removal and BOD(5)/COD ratio of the treated stream remained nearly unchanged during the time period when the regenerated catalyst was reused six times. The simple and effective catalyst regeneration method will make Fenton and Fenton-like oxidation a more cost-effective wastewater treatment alternative.
Cao
Guo-min
GM
Research Institute of Environmental Engineering, East China University of Science and Technology, Shanghai 200237, PR China. gmcao@ecust.edu.cn
Sheng
Mei
M
Niu
Wen-feng
WF
Fei
Yu-lei
YL
Li
Dong
D
D001673:Biodegradation, Environmental; D002244:Carbon / Q000378:metabolism; D002384:Catalysis; D003247:Conservation of Natural Resources / Q000379:methods*; D003362:Cost-Benefit Analysis; D003890:Desiccation; D005290:Ferric Compounds; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007220:Industrial Waste / Q000517:prevention & control*; D007501:Iron / Q000737:chemistry* / Q000302:isolation & purification*; D012722:Sewage; D012995:Solubility; D013464:Sulfuric Acids; D014873:Water Pollutants
C045076:Fenton's reagent; D005290:Ferric Compounds; D007220:Industrial Waste; D012722:Sewage; D013464:Sulfuric Acids; D014873:Water Pollutants; C021024:ferric hydroxide; D002244:Carbon; D006861:Hydrogen Peroxide; D007501:Iron; C033158:sulfuric acid