Abstract
In electrokinetic treatment of contaminated soils three transport phenomena are induced in soil solution: electroosmosis, electrophoresis and (1). These help in the extraction of contaminants and can be optimized by modifying conditions of the soil solution. Of the most important factors to consider are: soil type, electrolytic medium composition and current values. In this work first a model soil (sand A100) was characterized and its zeta potential (pZ) was measured varying electrolytes, pH and intensity of current. This in order to select the most appropriate parameters to be used in electrokinetic treatment. Since when the pZ is in the range of -30 to +30 mV colloidal particles (soil dispersion) tend to agglomerate hampering electrokinetic treatment it is recommended to work with pZ values outside this range. It was observed that dispersion using NH4AcO as electrolyte introduced a lower pZ value, so it is best to be used in electrokinetic treatment.
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