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Effects of Different Electron Donor Feeding Patterns on TCE Reductive Dechlorination Performance

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Abstract

This study investigates how the feeding pattern of e− donors might affect the efficiency of enhanced in situ bioremediation in TCE-contaminated aquifers. A series of lab-scale batch experiments were conducted using butyrate or hydrogen gas (H2) as e− donor and a TCE-dechlorinating microbial consortium dominated by Dehalococcoides spp. The results of these experiments demonstrate that butyrate is similarly efficient for TCE dechlorination whether it is injected once or in doses. Moreover, the present work indicates that the addition of butyrate in great excess cannot be avoided, since it most likely provide, even indirectly, significant part of the H2 required. Furthermore, methanogenesis appears to be the major ultimate e− accepting process in all experiments, regardless the e− donor used and the feeding pattern. Finally, the timing of injection of H2 seems to significantly affect dechlorination performance, since the injection during the early stages improves VC-to-ETH dechlorination and reduce methanogenic activity.

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Acknowledgments

This research was partially supported by a 4-year scholarship granted to Iraklis Panagiotakis and Kornilia Antoniou by the Department of Water Resources and Environmental Engineering of the School of Civil Engineering of the National Technical University of Athens.

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Authors and Affiliations

  1. School of Civil Engineering, National Technical University of Athens, 157 80, Zografou, Greece

    I. Panagiotakis, K. Antoniou, D. Mamais & M. Pantazidou

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  1. I. Panagiotakis
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  2. K. Antoniou
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  3. D. Mamais
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  4. M. Pantazidou
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Correspondence to I. Panagiotakis.

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Panagiotakis, I., Antoniou, K., Mamais, D. et al. Effects of Different Electron Donor Feeding Patterns on TCE Reductive Dechlorination Performance. Bull Environ Contam Toxicol 94, 289–294 (2015). https://doi.org/10.1007/s00128-015-1462-3

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  • DOI: https://doi.org/10.1007/s00128-015-1462-3

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