Lead Remediation from Landfill Leachate by Electrocoagulation – A Laboratory-Scale Study
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Treatment of raw leachate collected from an uncontrolled active landfill site by electrocoagulation method was carried out using iron electrodes in a batch reactor. The leachate was slightly alkaline (pH = 8.0) and contained various xenobiotic organics along with various heavy metals like lead (Pb), mercury (Hg), chromium (Cr), zinc (Zn), copper (Cu) etc. The effects of important parameters viz. initial pH, inter-electrode gap, charge density, current density and hydraulic retention time on lead removal were investigated. Assuming the reaction following a second order kinetics, a graph was plotted between 1/ (lead concentration) and time, which fitted well as a straight line with R2 = 0.958. The lead removal efficiency was observed to be maximum (90%) at pH 5.9, under 14.0A current at a hydraulic retention time of 70 min. The removal efficiency increased with the increase in current density, decrease in pH irrespective of inter-electrode distance. Use of iron electrode was found to be cost effective and economically feasible for treatment of leachate.
KeywordsElectrocoagulation Lead Landfill Leachate
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