Assessment of Removal of Mercury from Landfill Leachate by Electrocoagulation
In the recent times treatment of landfill leachate by nonconventional method such as electrochemical process has been increasing for its treatment efficiency. Among the electrochemical techniques, the process of electrocoagulation (EC) has largely been employed to remove heavy metals from municipal and industrial wastewaters. However, solid waste landfill leachate treatment with the aim of heavy metal removal especially mercury (Hg) has not been studied so much. Thus in this study the efficacy of the process of electrocoagulation using iron sacrificial electrodes has been evaluated for Hg removal from landfill leachate. Different operating conditions were studied for the removal of Hg which includes pH, inter-electrode distance, current density and operating time. The results of the batch experiments showed a maximum removal of 82.72% of Hg at the optimum operating conditions of current density of 4.93 mA/cm2, electrolysis time of 60 min, pH 7 and inter-electrode distance of 2.5 cm.
KeywordsElectrocoagulation Landfill leachate Hg removal Iron electrodes
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