Abstract
The efficiency of Fenton’s oxidation was assessed in this study for hazardous waste landfill leachate treatment. The two major reagents, which are generally employed in Fenton’s process are H2O2 as oxidizing agent and Fe2+ as catalyst. Batch experiments were conducted to determine the effect of experimental conditions viz., reaction time, molar ratio, and Fenton reagent dosages, which are significant parameters that influence the degradation efficiencies of Fenton process were examined. It was found that under the favorable experimental conditions, maximum COD removal was 56.49%. The optimum experimental conditions were pH=3, H2O2/Fe2+ molar ratio = 3 and reaction time = 150 minutes. The optimal amount of hydrogen peroxide and iron were 0.12 mol/L and 0.04 mol/L respectively. High dosages of H2O2 and iron resulted in scavenging effects on OH• radicals and lowered degradation efficiency of organic compounds in the hazardous waste landfill leachate.
Highlights
Engineered landfill is practiced as the easiest and most economical method of disposing municipal and hazardous solid waste
Biological treatment, chemical oxidation, chemical precipitation, activated carbon adsorption, electrochemical oxidation and ion exchange are the various treatment techniques which have been employed for the removal of recalcitrant organic compounds from landfill leachate [2]
Many researchers have reported the chemical treatment techniques, which uses the oxidizing agents viz; Fenton’s process, photo-Fenton, UV-Visible light or ozone for leachate treatment. These treatment methods are collectively known as advanced oxidation processes (AOPs), which employ hydroxyl radicals as a strong oxidation agent
Summary
Engineered landfill is practiced as the easiest and most economical method of disposing municipal and hazardous solid waste. Sufficient of ferrous ion is required to retain the moderate hydroxyl radicals’ reduction This leads to production of high volume of ferric hydroxide sludge in neutralization step of Fenton process, which has to be separated and disposed. By combining the biological and chemical treatment methods COD removal efficiency can be enhanced [6] This process has a few disadvantages, which include fast consumption of Fe2+ relative to its rate of regeneration, generation of sludge that requires post treatment, narrow pH range to operate, the complexity of few iron species and the possible waste of oxidants. The outcomes of this research might be useful for increasing COD removal efficiency using Fenton oxidation in the field
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