Remediation of Nickel -Contaminated Clayey Soil by Electro-Kinetic Technology Coupled with zeolite –a Permeable Reactive Barrier

Authors

  • Amal Hamza khalil
  • Ban Abdalwahedb

DOI:

https://doi.org/10.5755/j01.erem.73.4.19188

Keywords:

Nickel, Electrokinetic, Zeolite, EDTA, Acetic acid.

Abstract

This study examines the effectiveness of utilizing different purging solution acetic acid (AA), ammonium citrate (AC), ethylenediarninetertraacetic acid (EDTA), and sodium dodecyl sulphate (SDS)_ as purging solutions for saturating soil, as well as a catholyte solution in the electro-kinetic (EK) process coupled with zeolite as a permeable reactive barrier (PRB), which was loaded nickel-contaminated clayey soil in three regions: near the anode side, in the center, and near the cathode side. Twelve different tests (Series-1& Series-2) were conducted on clay soil spiked with nickel in concentrations of 250 mg/kg. These tests were conducted with voltage gradient of 1.5V/cm and processing time of 4 days for the Series-1 and 3 days for the Series-2. Results indicated that the EK/PRB leads to a significant improvement in the efficiency of removal as well as reducing the remediation duration, where it was noted that the removal efficiency in tests when zeolite-PRB was inserted at various regions (near the anode side, at the center, and near the cathode side) was 51.6%, 59.12%, and 41.76%, respectively, its greater than the test of the electro-kinetic process without a barrier was equal to 34.4% under the same conditions. Furthermore, the experiments have shown that inserting a barrier in regions near the anode side, at the center, and near the cathode side did not greatly affect the pH variation.

DOI: http://dx.doi.org/10.5755/j01.erem.73.4.19188

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Published

2017-12-22

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Section

Articles