Release of Electron Donors during Thermal Treatment of Soils

Marcet, Tyler F.; Cápiro, Natalie L.; Morris, Lawrence A.; Hassan, Sayed M.; Yang, Yi; Löffler, Frank E.; Pennell, Kurt D.

doi:10.1021/acs.est.7b06014

Title: Release of Electron Donors during Thermal Treatment of Soils

Abstract

Thermal treatment of soil and groundwater may provide an in situ source of soluble organic compounds and hydrogen (H₂) that could stimulate microbial reductive dechlorination (MRD) at sites impacted by chlorinated solvents. The objectives of this study were to identify and quantify the release of electron donors and fermentable precursors during soil heating and to estimate availability of these compounds following thermal treatment. Fourteen solid materials containing <0.01 to 63.81 wt % organic carbon (OC) were incubated at 30, 60, or 90 °C for up to 180 d, leading to the release of direct electron donors (i.e., H₂ and acetate) and fermentable volatile fatty acids (VFAs). Total VFA release ranged from 5 ± 0 × 10^–9 carbon per gram solid (mol C/gs) during 30 °C incubation of quartz sand to 820 ± 50 × 10^–6 mol C/gs during 90 °C incubation of humic acid, and was positively impacted by incubation time, temperature, and solid-phase OC content. H₂ gas was detected at a maximum of 180 ± 50 × 10^–9 mol H₂/g_s, accounting for less than 0.3% of reducing equivalents associated with VFAs released under the same conditions. These findings will allow for more reliable prediction of substrate release during thermalmore »« less

Authors:

^[1];

^[1]; Morris, Lawrence A. ^[2]; Hassan, Sayed M. ^[2];

^[3];

^[4];

^[5]

Tufts Univ., Medford, MA (United States)
Univ. of Georgia, Athens, GA (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Brown Univ., Providence, RI (United States)

Publication Date:: 2018-03-08

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1476401

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Environmental Science and Technology

Additional Journal Information:: Journal Volume: 52; Journal Issue: 6; Journal ID: ISSN 0013-936X

Publisher:: American Chemical Society (ACS)

Country of Publication:: United States

Language:: English

Subject:: 54 ENVIRONMENTAL SCIENCES

Citation Formats


                    Marcet, Tyler F., Cápiro, Natalie L., Morris, Lawrence A., Hassan, Sayed M., Yang, Yi, Löffler, Frank E., and Pennell, Kurt D. Release of Electron Donors during Thermal Treatment of Soils.  United States: N. p., 2018. 
Web.  doi:10.1021/acs.est.7b06014.

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                    Marcet, Tyler F., Cápiro, Natalie L., Morris, Lawrence A., Hassan, Sayed M., Yang, Yi, Löffler, Frank E., & Pennell, Kurt D. Release of Electron Donors during Thermal Treatment of Soils.  United States.  https://doi.org/10.1021/acs.est.7b06014

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                    Marcet, Tyler F., Cápiro, Natalie L., Morris, Lawrence A., Hassan, Sayed M., Yang, Yi, Löffler, Frank E., and Pennell, Kurt D. Thu .  
"Release of Electron Donors during Thermal Treatment of Soils".  United States.  https://doi.org/10.1021/acs.est.7b06014.  https://www.osti.gov/servlets/purl/1476401.

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@article{osti_1476401,

  title        = {Release of Electron Donors during Thermal Treatment of Soils},

  author       = {Marcet, Tyler F. and Cápiro, Natalie L. and Morris, Lawrence A. and Hassan, Sayed M. and Yang, Yi and Löffler, Frank E. and Pennell, Kurt D.},

  abstractNote = {Thermal treatment of soil and groundwater may provide an in situ source of soluble organic compounds and hydrogen (H2) that could stimulate microbial reductive dechlorination (MRD) at sites impacted by chlorinated solvents. The objectives of this study were to identify and quantify the release of electron donors and fermentable precursors during soil heating and to estimate availability of these compounds following thermal treatment. Fourteen solid materials containing <0.01 to 63.81 wt % organic carbon (OC) were incubated at 30, 60, or 90 °C for up to 180 d, leading to the release of direct electron donors (i.e., H2 and acetate) and fermentable volatile fatty acids (VFAs). Total VFA release ranged from 5 ± 0 × 10–9 carbon per gram solid (mol C/gs) during 30 °C incubation of quartz sand to 820 ± 50 × 10–6 mol C/gs during 90 °C incubation of humic acid, and was positively impacted by incubation time, temperature, and solid-phase OC content. H2 gas was detected at a maximum of 180 ± 50 × 10–9 mol H2/gs, accounting for less than 0.3% of reducing equivalents associated with VFAs released under the same conditions. These findings will allow for more reliable prediction of substrate release during thermal treatment, supporting the implementation of coupled thermal and biological remediation strategies.},

  doi          = {10.1021/acs.est.7b06014},

  journal      = {Environmental Science and Technology},

  number       = 6,

  volume       = 52,

  place        = {United States},

  year         = {2018},

  month        = {3}

}

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https://doi.org/10.1021/acs.est.7b06014

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Figure 1: VFAs (as carbon) and H₂ release following 30, 60, and 90 °C incubation of Federal Fine Ottawa sand (a−c); Groveland aquifer material (d−f); Appling soil (g−i); and Webster soil (j−l) for 28, 42, and 56 d (ampule set 1). Error bars represent one standard deviation. Source data availablemore »

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