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Stability and performance enhancements of Electrokinetic-Fenton soil remediation

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Abstract

Electrokinetic process is a potential in situ soil remediation process which transports the contaminants via electromigration and electroosmosis. For organic compounds contaminated soil, Fenton’s reagent is utilized as a flushing agent in electrokinetic process (Electrokinetic-Fenton) so that removal of organic contaminants could be achieved by in situ oxidation/destruction. However, this process is not applied widely in industries as the stability issue for Fenton’s reagent is the main drawback. The aim of this mini review is to summarize the developments of Electrokinetic-Fenton process on enhancing the stability of Fenton’s reagent and process efficiency in past decades. Generally, the enhancements are conducted via four paths: (1) chemical stabilization to delay H2O2 decomposition, (2) increase of oxidant availability by monitoring injection method for Fenton’s reagent, (3) electrodes operation and iron catalysts and (4) operating conditions such as voltage gradient, electrolytes and H2O2 concentration. In addition, the types of soils and contaminants are also showing significant effect as the soil with low acid buffering capacity, adequate iron concentration, low organic matter content and low aromatic ring organic contaminants generally gives better efficiency.

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Acknowledgments

This work is financially supported by Grant UMQUB6A-2011 and PPP Grant PG143-2012B, University of Malaya.

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Authors and Affiliations

  1. Department of Chemical Engineering, Faculty of Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia

    Y. S. Ng & M. A. Hashim

  2. School of Planning, Architecture and Civil Engineering, Queen’s University Belfast, David Keir Building, Belfast, BT9 5AG, UK

    B. Sen Gupta

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  1. Y. S. Ng
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  2. B. Sen Gupta
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Correspondence to M. A. Hashim.

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Ng, Y.S., Sen Gupta, B. & Hashim, M.A. Stability and performance enhancements of Electrokinetic-Fenton soil remediation. Rev Environ Sci Biotechnol 13, 251–263 (2014). https://doi.org/10.1007/s11157-014-9335-5

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