REMOVAL EFFICIENCIES OF IRON FROM DIFFERENT SOILS DURING DIFFERENT PROCESSES OF ELECTRO-KINETIC EXTRACTIONSHANKARA, B. S. NAGENDRA PRAKASH AND P. V. SIVAPULLAIAH
Decontamination of heavy metal ions from contaminated soils by electro-kinetic extraction has several advantages over conventional methods. The extent of removal may vary considerably as it is both soil specific and ion specific. The various conditions that affect the removal are the voltage applied across soil, duration of applied voltage, pH of purging fluid, availability of complexing agents etc. Thus in this paper an attempt has been to find out optimum conditions to be maintained for the removal of iron from three different soils viz., Red Earth, kaolinitic red earth, Illite, and montmorillonitic Black Cotton Soil. The effect of catholyte conditioning with dilute acetic acid and EDTA complexing agent, applied voltage and duration of extraction to enhance the removal of iron has been considered. It was found that the removal efficiencies of iron improved voltage applied, nature of pore fluid for illite and black cotton soil. This shows that desorption of iron from soil and consequent ion migration is favoured by acidic conditions. The removal efficiency of iron from red earth is only by flushing because of its high hydraulic conductivity lower surface charges.
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