Preliminary Study on Bio-Electrokinetic Remediation of Saturated Oil-Contaminated Soil

Abstract:

Bio-electrokinetic remediation of oil-contaminated soil is a promising technology. In this study, three bio-electrokinetic remediation experiments were carried out to study the effects of external addition of oil-degrading bacteria by electrokinetics and different operational parameters on oil decontamination in saturated soil. Results showed that oil in soil migrated from the anode towards the cathode with forward electroosmotic flow and accumulated near the cathode. Oil was barely degraded without external addition of oil-degrading bacteria. Although electrolytes were refreshed every 12 hr, soil pH varied greatly at the electrodes under unidirectional operation. When electrode polarity was reversed every 2 hr, soil pH was efficiently controlled within the range of 6.35-9.75. The relative oil concentrations after the bidirectional experiment were in the range of 0.81-0.84 after 20 days of treatment. The relatively low oil degradation rate may be due to the facultative aerobic environment in the saturated soil matrix.

• Periodical: Advanced Materials Research (Volumes 1030-1032)
• Pages: 305-308
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1030-1032.305
• Online since: September 2014
• Authors: Ying Ying Gu*, Ying Xing, Yun Qi Shi, Xiu Xia Zhang, Qi You Liu, Chun Shuang Liu
• Keywords: Bio-Electrokinetic Remediation, Crude Oil, Oil-Degrading Bacteria, Soil

References

[1] K. Urum, T. Pekdemir and M. Çopur: Journal of Colloid and Interface Sci. Vol. 276 (2004), p.456.

[2] H.H.E. Isitekhale, S.I. Aboh, R.I. Edion and M.I. Abhanzioya: J. Environ. Earth Sci. Vol. 3 (2013), p.116.

[3] Z.Y. Dong, W.H. Huang, D.F. Xing and H.F. Zhang: J. Hazard. Mater. Vol. 260 (2013), p.399.

[4] Q.S. Luo, X.H. Zhang, H. Wang, and Y. Qian: J. Hazard. Mater. Vol. B121 (2005), p.187.

[5] A.T. Yeung and Y. -Y. Gu: J. Hazard. Mater. Vol. 195 (2011), p.11.

[6] A.T. Yeung and Y. -Y. Gu, in: Chelating Agents for Land Decontamination Technologies, edited by D.C.W. Tsang, I.M.C. Lo R.Y. Surampalli, chapter 9, ASCE Press (2012).

DOI: 10.1061/9780784412183

[7] A. Olszanowski and K. Piechowiak: Pol. J. Environ. Stud. Vol. 15 (2006), p.303.

[8] Q.S. Luo, H. Wang, X.H. Zhang, X.Y. Fan and Y. Qian: Chemosphere Vol. 64 (2006), p.415.

[9] L.Y. Wick, L. Shi and H. Harms: Electrochim. Acta Vol. 52 (2007), p.3441.

[10] T.T. Li, S.H. Guo, B. Wu, F.M. Li and Z.X. Niu: J. Environ. Sci. -China Vol. 22 (2010), p.1381.

[11] Y. -Y. Gu: Ph. D thesis, the University of Hong Kong (2011).