Optimization of Fenton process for the treatment of landfill leachate

The treatment of landfill leachate by Fenton process was carried out in a batch reactor. The effect of operating conditions such as reaction time, pH, H 2O 2 to Fe(II) molar ratio, Fenton's reagent dosage, initial COD strength, feeding mode, the type of polymer, and temperature on the efficacy...

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Bibliographic Details
Published in:Journal of hazardous materials 2005-10, Vol.125 (1), p.166-174
Main Authors: Zhang, Hui, Choi, Heung Jin, Huang, Chin-Pao
Format: Article
Language:English
Subjects:
Applied sciences
Batch mode
Chemical engineering
Chemical oxidation
Environmental Pollutants - analysis
Environmental Pollutants - isolation & purification
Environmental Pollution - prevention & control
Exact sciences and technology
Fenton's reagent
Flocculation
General treatment and storage processes
Hydrogen Peroxide - analysis
Hydrogen-Ion Concentration
Iron
Kinetics
Landfill leachate
Liquid-liquid and fluid-solid mechanical separations
Osmolar Concentration
Pollution
Reactors
Refuse Disposal - methods
Settling
Temperature
Wastes
Water - chemistry
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Summary:The treatment of landfill leachate by Fenton process was carried out in a batch reactor. The effect of operating conditions such as reaction time, pH, H 2O 2 to Fe(II) molar ratio, Fenton's reagent dosage, initial COD strength, feeding mode, the type of polymer, and temperature on the efficacy of Fenton process was investigated. It is demonstrated that Fenton's reagent can effectively degrade leachate organics. Fenton process was so fast that it was complete in 30 min. The oxidation of organic materials in the leachate was pH dependent and the optimal pH was 2.5. The favorable H 2O 2 to Fe(II) molar ratio was 1.5, and organic removal increased as dosage increased at the favorable H 2O 2 to Fe(II) molar ratio. The efficacy of Fenton process was improved by adding Fenton's reagent in multiple steps than that in a single step. Furthermore, the stepwise addition of both hydrogen peroxide and ferrous iron was more effective than that of hydrogen peroxide only. Sludge settling characteristics were much improved with the addition of the proper polymer. Temperature gave a positive effect on organic removal.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2005.05.025