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Chemosphere
Vol. 146, 2016, Pages: 300–307

Effect of electric field on the performance of soil electro-bioremediation with a periodic polarity reversal strategy

E. Mena, J. Villaseņor, P. Caņizares, M.A. Rodrigo

Chemical Engineering Department, Faculty of Chemical Sciences and Technologies, Research Institute for Chemical and Environmental Technology (ITQUIMA), Universidad de Castilla La Mancha, Campus Universitario s/n.13071, Ciudad Real, Spain.

Abstract

In this work, it is studied the effect of the electric fields (within the range 0.0–1.5 V cm-1) on the performance of electrobioremediation with polarity reversal, using a bench scale plant with diesel-spiked kaolinite with 14-d long tests. Results obtained show that the periodic changes in the polarity of the electric field results in a more efficient treatment as compared with the single electro-bioremediation process, and it does not require the addition of a buffer to keep the pH within a suitable range. The soil heating was not very important and it did not cause a change in the temperature of the soil up to values incompatible with the life of microorganisms. Low values of water transported by the electro-osmosis process were attained with this strategy. After only 14 d of treatment, by using the highest electric field studied in this work (1.5 V cm-1), up to 35.40% of the diesel added at the beginning of the test was removed, value much higher than the 10.5% obtained by the single bioremediation technology in the same period.

Graphical abstract

Keywords: Electrobioremediation; Bioremediation; Polarity reversal; pH; Diesel.
 
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