Abstract
As an advanced oxidative processes, the Fenton process is receiving popularity as a wastewater treatment technique that can be used for hazardous landfill leachate. The treatment is simple, yet involves complex interactions between the affecting parameters including reaction time, H2O2/Fe2+ ratio, pH, and iron (II) ion concentration. Hence, the purpose of this present study was to analyze the factors affecting landfill leachate treatment as well as their interaction by means of response surface methodology (RSM) with central composite design. The independent variables were reaction time, H2O2/Fe2+ ratio, iron (II) ion concentration, and pH, and the dependent variable (response) was color-removal percentage. The optimum treatment conditions for pH, H2O2/Fe2+ ratio, Fe2+ concentration, and reaction time were 8.36, 3.32, 964.95 mg/L, and 50.15 min, respectively. The model predicted 100% color removal in optimum conditions, which was close to that obtained from the experiment (97.68%). In conclusion, the optimized Fenton process using the RSM approach promotes efficient landfill leachate treatment that is even higher than that already reported.
Highlights
Liquids may become contaminated from dissolved or suspended materials when passing through municipal solid waste landfills
There were 80 runs conducted as provisioned by the full factorial method in the laboratory during the preliminary investigation
A number of runs were applied on Fe2+ concentration variation based on the predetermined H2 O2 :Fe2+
Summary
Liquids may become contaminated from dissolved or suspended materials when passing through municipal solid waste landfills. The term used for these liquids is landfill leachate; it is commonly a dark color with strong smell and carries high organic and inorganic loads [1]. The contaminant loads can be divided into four groups—heavy metals (Pb2+ , Ni2+ , Cd2+ , Zn2+ , Cr3+ , and Cu2+ ), major inorganic ions (NH4 + , Fe2+ , Ca2+ , Mn2+ , Na+ , Cl− , K+ , SO4 −2 , Mg2+ , and HCO3 − ), dissolved organic matter (including volatile fatty acids as well as persistent organic matters such as humic compounds), and xenobiotic organic substances derived from chemical and domestic residue (including aromatic hydrocarbons, phenols, and pesticides). Regardless of its toxicity and recalcitrance, landfill leachate persists in increasing amounts owing to the landfilling methods used for either municipal or industrial solid waste discharge [5]
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