A Sequential Coagulation-Activated Carbon/Hydrogen Peroxide Oxidation Process For Treating Municipal Solid Waste Landtill Leachate

Given its toxic and complex nature,landfill leachate needs to be well treated before being discharged into the surrounding enrionment.In this study,the combination of coagulation-activated carbon/hydrogen peroxide processes was designed for treating the landfill leachate with the high organic content.The optimum treatment conditions were examined through conducting a serious of experiments.For coagulation,FeCl₃ was chosen as the coagulant agent.The optimum operating conditions was ferric chloride dose of 200mg/L and pH of 4.For activated carbon/hydrogen peroxide oxidation,the optimized conditions were room temperature,pH of 3,hydrogen peroxide dosage of 5ml/L,activated carbon/hydrogen peroxide stoichiometric ratio of 1:2 and reaction time of 120min.After being treated by the coagulation-activated carbon/hydrogen peroxide processes,the removal rates for CODcr,UV254,UV410 and UV436 levels in the target landfill leachate were improved significantly up to as much as 89.44%,82.13%,90.625%and91.35%,respectively.CODcr was lowered by 89.44%to 75.69mg/L. Moreover,the quality of the effluent from the sequential processes treatment meets the emission standard set by the State Standard for Municipal Solid Waste Sanitary Landfill Pollution Control(Standard No GB16889-2008).