The treatment of stabilized landfill leachate using iron-activated persulfate and peroxymonosulfate oxidation
Keywords:Chemical Oxygen Demand, sulfate radical, coagulation-flocculation, advanced oxidation process, ecotoxicity
Application of sulfate radical based advanced oxidation process for wastewater treatment has gained more attention recently. In this study, the feasibility of SR-AOP in the reduction of chemical oxygen demands (COD) of pre-treated landfill leachate was evaluated. In this study, coagulation-flocculation pre-treatment was found to degrade nearly 70% of COD of the raw leachate. However, the COD concentration was still exceeded the discharge limit for most of the countries. The pre-treated leachate was then subjected to SR-AOP. In this work, sulfate radical was generated by using Fe(II) activated persulfate (PS) and peroxymonosulfate (PMS). Oxidant:Fe(II) ratio, the dosage of oxidants and reaction time was found to be the main parameters which influence the COD reduction efficiency for both PMS/Fe(II) and PS/Fe(II) treatment systems. Nevertheless, the initial pH of leachate and types of oxidants were not significantly influenced the COD degradation. By using the optimal condition, nearly 83 and 84% of COD were reduced by the combination of coagulation-flocculation treatment coupled with PMS/Fe(II) and PS/Fe(II) treatments. Ecotoxicity analysis by zebrafish showed that the toxicity was significantly reduced after coagulation-flocculation. However, the toxicity was found to be slightly increased after SR-AOP due to the presence of residual sulfate ion in the treated effluent.
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