Abstract

GUO, Lin; LIU, Jun; CHEN, Yao  and  ZHANG, Xiaocun. Remediation of high concentration chromium contaminated soil by Enhanced Electrodynamic Method. Earth Sci. Res. J. [online]. 2021, vol.25, n.2, pp.247-253.  Epub Oct 20, 2021. ISSN 1794-6190.  https://doi.org/10.15446/esrj.v25n2.93896.

High concentration of chromium salt has caused serious pollution to the environment since its production. The long-standing chromium residue has polluted the soil, and the total chromium concentration of some polluted soil has reached 30000 mg / kg. For the remediation of chromium contaminated soil, the enhanced electrodynamic method was proposed. In order to improve the efficiency of electrokinetic remediation of chromium contaminated soil, two enhanced electrokinetic remediation technologies were proposed: Electrokinetic oxidation enhanced remediation technology and electrokinetic enhanced remediation technology. Cr(III) in soil was polluted by oxidant chromium oxide to increase the content of dissolved Cr(VI),so as to improve the efficiency of electric repair, in order to find a suitable PRB medium as a breakthrough to improve the repair efficiency. The experimental results show that compared with the traditional electrodynamic technology, the enhanced electrodynamic method can effectively improve the removal rate of total chromium in the soil, and provide technical support for the enhanced electrodynamic remediation of chromium contaminated soil. The pH control system makes the pH of anode and cathode electrolyte always maintain acidic, and the H+ migration speed is faster than that of OH-, and the pH of soil near the anode is lower than that near the cathode.

Keywords : Enhanced electrodynamic method; High concentration chromium; Contaminated soil method; Solubility.

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