Abstract
Electrokinetic-microbial remediation (EMR) has emerged as a promising option for the removal of polycyclic aromatic hydrocarbons (PAHs) from contaminated soils. The aim of this study was to enhance degradation of phenanthrene (Phe)-contaminated soils using EMR combined with biosurfactants. The electrokinetic (EK) remediation, combined with Phe-degrading Sphingomonas sp. GY2B, and biosurfactant obtained by fermentation of Pseudomonas sp. MZ01, degraded Phe in the soil with an efficiency of up to 65.1 % at the anode, 49.9 % at the cathode after 5 days of the treatment. The presence of biosurfactants, electricity, and a neutral electrolyte stimulated the growth of the degrading bacteria as shown by a rapid increase in microbial biomass with time. The electrical conductivity and pH changed little during the course of the treatment, which benefitted the growth of microorganisms and the remediation of Phe-contaminated soil. The EMR system with the addition of biosurfactant had the highest Phe removal, demonstrating the biosurfactant may enhance the bioavailability of Phe and the interaction with the microorganism. This study suggests that the EMR combined with biosurfactants can be used to enhance in situ bioremediation of PAH-contaminated soils.
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Acknowledgments
This study was supported by the National Natural Science Foundation of China (41101291), the Science and Technology Planning Project of Guangdong Province(2014A20217002), the National High Technology Research and Development Program of China (2012AA101403) and Ministry of Science and Technology of China (2012AA06A203). We thank our visiting professor, D. Barnes, for providing valuable comments on the manuscript.
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Lin, W., Guo, C., Zhang, H. et al. Electrokinetic-Enhanced Remediation of Phenanthrene-Contaminated Soil Combined with Sphingomonas sp. GY2B and Biosurfactant. Appl Biochem Biotechnol 178, 1325–1338 (2016). https://doi.org/10.1007/s12010-015-1949-8
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DOI: https://doi.org/10.1007/s12010-015-1949-8