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Using a high-organic matter biowall to treat a trichloroethylene plume at the Beaver Dam Road landfill

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Abstract

Trichloroethylene (TCE) is a highly effective industrial degreasing agent and known carcinogen. It was frequently buried improperly in landfills and has subsequently become one of the most common groundwater and soil contaminants in the USA. A common strategy to remediate TCE-contaminated sites and to prevent movement of the TCE plumes into waterways is to construct biowalls which consist of biomaterials and amendments to enhance biodegradation. This approach was chosen to contain a TCE plume emanating from a closed landfill in Maryland. However, predicting the effectiveness of biowalls is often site specific. Therefore, we conducted an extensive series of batch reactor studies at 12 °C as opposed to the typical room temperature to examine biowall fill-material combinations including the effects of zero-valent iron (ZVI) and glycerol amendments. No detectable TCE was observed after several months in the laboratory study when using the unamended 4:3 mulch-to-compost combination. In the constructed biowall, this mixture reduced the upstream TCE concentration by approximately 90% and generated ethylene downstream, an indication of successful reductive dechlorination. However, the more toxic degradation product vinyl chloride (VC) was also detected downstream at levels approximately ten times greater than the maximum contaminant level. This indicates that incomplete degradation also occurred. In the laboratory, ZVI reduced VC formation. A hazard quotient was calculated for the landfill site with and without the biowall. The addition of the biowall decreased the hazard quotient by 88%.

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Acknowledgements

Funding for this work was by US Department of Agriculture–Agricultural Research Service intramural project in National Program 212, Soil and Air and by a specific cooperative agreement with the University of Maryland, 8042-12610-002-06S. Partial graduate student funding was received from the Metropolitan Washington Chapter of the Achievement Rewards for College Scientists (ARCS) Foundation. This manuscript describes original work and the authors do not have any conflicts of interest.

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Correspondence to Alba Torrents.

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Mention of specific products is for identification purposes only and does not imply endorsement by the US Department of Agriculture nor the Federal Government to the exclusion of other suitable products or suppliers.

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The authors declare that they have no conflict of interest.

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Responsible editor: Philippe Garrigues

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Niño de Guzmán, G.T., Hapeman, C.J., Millner, P.D. et al. Using a high-organic matter biowall to treat a trichloroethylene plume at the Beaver Dam Road landfill. Environ Sci Pollut Res 25, 8735–8746 (2018). https://doi.org/10.1007/s11356-017-1137-1

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  • DOI: https://doi.org/10.1007/s11356-017-1137-1

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