Removal of Heavy Metals from Industrial Sludge Using Soil Washing Technique
In the present study, column leaching tests were conducted with two leaching solutions, i.e., distilled water and 0.1N HCl + 0.1N EDTA to know their removal efficiencies of heavy metal ions of Cu, Zn, Ni, Cd, Pb, Fe and Cr present in the industrial sludge. It was observed that distilled water was able to remove only a few metal ions Cu, Zn, and Ni in lesser quantities. Using 0.1N HCl + 0.1N EDTA, all the heavy metals were leached out with removal efficiencies in the range of 71-98%. Using the results of column leaching tests, the migration rates of different metal ions were determined which can be used to design the soil washing programme at the site to treat the similar sludge
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