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Successful treatment of an MTBE-impacted aquifer using a bioreactor self-colonized by native aquifer bacteria

Abstract

A field-scale fixed bed bioreactor was used to successfully treat an MTBE-contaminated aquifer in North Hollywood, CA without requiring inoculation with introduced bacteria. Native bacteria from the MTBE-impacted aquifer rapidly colonized the bioreactor, entering the bioreactor in the contaminated groundwater pumped from the site, and biodegraded MTBE with greater than 99 % removal efficiency. DNA sequencing of the 16S rRNA gene identified MTBE-degrading bacteria Methylibium petroleiphilum in the bioreactor. Quantitative PCR showed M. petroleiphilum enriched by three orders of magnitude in the bioreactor above densities pre-existing in the groundwater. Because treatment was carried out by indigenous rather than introduced organisms, regulatory approval was obtained for implementation of a full-scale bioreactor to continue treatment of the aquifer. In addition, after confirmation of MTBE removal in the bioreactor to below maximum contaminant limit levels (MCL; MTBE = 5 μg L−1), treated water was approved for reinjection back into the aquifer rather than requiring discharge to a water treatment system. This is the first treatment system in California to be approved for reinjection of biologically treated effluent into a drinking water aquifer. This study demonstrated the potential for using native microbial communities already present in the aquifer as an inoculum for ex-situ bioreactors, circumventing the need to establish non-native, non-acclimated and potentially costly inoculants. Understanding and harnessing the metabolic potential of native organisms circumvents some of the issues associated with introducing non-native organisms into drinking water aquifers, and can provide a low-cost and efficient remediation technology that can streamline future bioremediation approval processes.

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Acknowledgments

We are grateful to Kevin Feris for scientific and technical expertise and to Shanna Rompel and Cindy Wallace for laboratory support. This project was funded, in part, by the Tesoro Corporation, Inc., by the Environmental Protection Agency’s Science to Achieve Results (STAR) fellowship program and by the National Institute of Environmental Health Sciences (NIEHS), NIH (grant number 5 P42 ES004699). Its contents are solely the responsibility of the authors and do not necessarily represent the official views of the Tesoro, EPA, NIEHS or NIH.

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Correspondence to Radomir Schmidt.

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Hicks, K.A., Schmidt, R., Nickelsen, M.G. et al. Successful treatment of an MTBE-impacted aquifer using a bioreactor self-colonized by native aquifer bacteria. Biodegradation 25, 41–53 (2014). https://doi.org/10.1007/s10532-013-9639-0

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  • DOI: https://doi.org/10.1007/s10532-013-9639-0

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