Migration of Cu2+ in a contaminated kaolinite during electro-osmotic consolidation

Liming Hu, Lin Zhang, Hui Wu, Jay Meegoda

Research output: Contribution to conferencePaperpeer-review

Abstract

The main object of this study is to investigate the migration of Cu2+ during electro-osmotic consolidation. Application of a low-level electric field to a soil mass results in electro-osmotic and electro-migration flows, which further cause decrease in water content and migration of heavy metals. A kaolinite mixed with Cu(NO3)2 solution was used in this study. The pH, current, voltage gradient, concentration of Cu2+ in soil samples were measured, and the impact of voltage gradient was evaluated. The main transport mechanisms of heavy metals under electrical field include electro-osmosis and electro-migration. Due to the release of H+ and OH-, the soil became acidic near the anode and alkaline near the cathode. The experiment results indicated that Cu2+ migrated from the anode to cathode, however, the removal efficiency of Cu2+ was low due to the precipitation of Cu2+ near the cathode. The optimal voltage gradient was found to be 1V/cm for dewatering and 1.5V/cm for decontamination.

Original languageEnglish (US)
Pages3127-3130
Number of pages4
StatePublished - 2017
Event19th International Conference on Soil Mechanics and Geotechnical Engineering, ICSMGE 2017 - Seoul, Korea, Republic of
Duration: Sep 17 2017Sep 22 2017

Other

Other19th International Conference on Soil Mechanics and Geotechnical Engineering, ICSMGE 2017
Country/TerritoryKorea, Republic of
CitySeoul
Period9/17/179/22/17

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology

Keywords

  • Consolidation
  • Copper
  • Decontamination
  • Electrokinetic

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