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Mineralization of hexachlorocyclohexane in soil during solid-phase bioremediation

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Journal of Industrial Microbiology and Biotechnology

Abstract

Soil containing hexachlorocyclohexane (HCH) was spiked with 14C-γ-HCH and then subjected to bioremediation in bench-scale microcosms to determine the rate and extent of mineralization of the 14C-labeled HCH to 14CO2. The soil was treated using two different DARAMEND amendments, D6386 and D6390. The amendments were previously found to enhance natural HCH bioremediation as determined by measuring the disappearance of parent compounds under either strictly oxic conditions (D6386), or cycled anoxic/oxic conditions (D6390). Within 80 days of the initiation of treatment, mineralization was observed in all of the strictly oxic microcosms. However, mineralization was negligible in the cycled anoxic/oxic microcosms throughout the 275-day study, even after cycling was ceased at 84 days and although significant removal (up to 51%) of indigenous γ-HCH (146 mg/kg) was detected by GC with electron capture detector. Of the amended, strictly oxic treatments, only one, in which 47% of the spiked 14C-HCH was recovered as 14CO2, enhanced mineralization compared with an unamended treatment (in which 34% recovery was measured). Other oxic treatments involving higher amendment application rates or auxiliary carbon sources were inhibitory to mineralization. Thus, although HCH degradation occurs during the application of either oxic or cycled anoxic/oxic DARAMEND treatments, mineralization of γ-HCH may be inhibited depending on the amendment and treatment protocol.

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Acknowledgements

This research was made possible by support from Adventus Remediation Technologies and funds provided by the Centre for Research in Earth and Space Technology (CRESTech). Research by J.T.T. and H.L. was supported by individual Discovery Grants from the Natural Sciences and Engineering Research Council (NSERC) of Canada.

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Phillips, T.M., Lee, H., Trevors, J.T. et al. Mineralization of hexachlorocyclohexane in soil during solid-phase bioremediation. J IND MICROBIOL BIOTECHNOL 31, 216–222 (2004). https://doi.org/10.1007/s10295-004-0139-4

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  • DOI: https://doi.org/10.1007/s10295-004-0139-4

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