Abstract
Hexachlorocyclohexane (HCH) contaminated soils were treated for a period of up to 64 days in situ (HCH dumpsite, Lucknow) and ex situ (University of Delhi) in line with three bioremediation approaches. The first approach, biostimulation, involved addition of ammonium phosphate and molasses, while the second approach, bioaugmentation, involved addition of a microbial consortium consisting of a group of HCH-degrading sphingomonads that were isolated from HCH contaminated sites. The third approach involved a combination of biostimulation and bioaugmentation. The efficiency of the consortium was investigated in laboratory scale experiments, in a pot scale study, and in a full-scale field trial. It turned out that the approach of combining biostimulation and bioaugmentation was most effective in achieving reduction in the levels of α- and β-HCH and that the application of a bacterial consortium as compared to the action of a single HCH-degrading bacterial strain was more successful. Although further degradation of β- and δ-tetrachlorocyclohexane-1,4-diol, the terminal metabolites of β- and δ-HCH, respectively, did not occur by the strains comprising the consortium, these metabolites turned out to be less toxic than the parental HCH isomers.
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Acknowledgments
Part of this work was supported by grants from the Indo-Swiss Collaboration in Biotechnology (ISCB) from the Swiss Agency for Development and Cooperation (SDC), Switzerland and the Department of Biotechnology (DBT), Government of India and National Bureau of Agriculturally Important Microorganisms (NBAIM), Government of India. NG, SJ, NS, JK, NN, AD, acknowledge Council of Scientific Research and Industrial Research (CSIR), Govt. of India, AS, VD, NN and PK acknowledge University Grants Commission (UGC), Govt. of India, PL acknowledge Indian Council of Agricultural Research (ICAR), Govt. of India and AKS acknowledge Department of Biotechnology (DBT), Govt. of India for providing the research fellowships. We also thank Dr. Faizan Haider (Lucknow University, India) for his help in field trials. The authors acknowledge Rinku Pandey, Gunjan Pandey, and John Oakeshott (CSIRO, Canberra, Australia) for providing the codon optimized clone of linB. We would also like to thank the Department of Soil Science and Agricultural Chemistry, Indian Agricultural Research Institute (IARI), New Delhi for carrying out physicochemical characterization of the soil.
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Garg, N., Lata, P., Jit, S. et al. Laboratory and field scale bioremediation of hexachlorocyclohexane (HCH) contaminated soils by means of bioaugmentation and biostimulation. Biodegradation 27, 179–193 (2016). https://doi.org/10.1007/s10532-016-9765-6
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DOI: https://doi.org/10.1007/s10532-016-9765-6