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Electrical Behavior of Copper Mine Tailings During EKR with Modified Electric Fields

Abstract

Electro-kinetic remediation (EKR) with sinusoidal electric field obtained simultaneously with DC/AC voltage reduce the polarization of the EKR with DC voltage. The DC voltage value defines the presence of a periodic polarity reversal of the cell and the electrical charge for electro-kinetic transport. In this case, the AC frequency favors the breaking of polarization conditions resulting from the EKR with DC voltage. However, with high frequencies a negative effect occurs where the tailings behave as a filter circuit, discriminating frequencies of an electric signal. The goal of this work is to analyse the electrical behaviour of tailings in EKR experiments. The conditions selected were: DC/AC voltages: 10/15 and 20/25 V (peak values), and AC voltage frequencies 50–2000 Hz. When the AC frequency reaches 2000 Hz, the copper removal tends to zero, indicating that the tailing behaves as a high-pass filter in which the DC voltage was filtered out.

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Acknowledgments

This work was supported by the UTFSM Project 27.15.38.

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Correspondence to Adrian Rojo.

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Rojo, A., Hansen, H.K., Monárdez, O. et al. Electrical Behavior of Copper Mine Tailings During EKR with Modified Electric Fields. Bull Environ Contam Toxicol 98, 304–309 (2017). https://doi.org/10.1007/s00128-016-1858-8

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Keywords

  • Electro-remediation
  • Sinusoidal electric field
  • Filter circuit
  • Mine tailings