Effect of Low-Frequency AC Supply and Purging Solution on Remediation of Nickel-Contaminated Soil Using Electrokinetics

Abstract

The complete earth is prone to natural hazards, cannot be prevented, but through an understanding of the earth condition and the processes which could culminate in damage to life and property, it is possible to minimize the damage through proper disaster management measures. Man-made hazards have today taken over natural hazards in terms of the loss of life and the long term effect on mankind and the ecosystem on the whole. Reddy et al. reported on laboratory electrokinetic experiments that were conducted on different soils, namely, commercial kaolin and Na-montmorillonite as well as a field-derived glacial till. The presented work is an attempt to study effect of various variables, i.e. type of anodic and cathodic purging solution, periodic supply as well as improvement of soil with application of low-frequency AC supply instead of DC supply. The complete study has been carried out on models having different length with the Nickel (Ni(II)) & commercially available Kaolinite being artificially spiked using Nickel Chloride salt. This study on feasibility of using different extracting solution at various use of 0.1 M Ethylenediamine tetra-acetic acid (EDTA) better as compared to 1 M Sodium Nitrate. The Nickel removal efficiency of organic acid such as citric acid was found to be low as compared to other solution, the best removal being achieved with 1 M NaCl.