| Title: | Release of Electron Donors during Thermal Treatment of Soils |
| Author(s): | Marcet TF; Capiro NL; Morris LA; Hassan SM; Yang Y; Loffler FE; Pennell KD; |
| Address: | "Department of Civil and Environmental Engineering , Tufts University , Medford , Massachusetts 02155 , United States. Biosciences Division and Joint Institute for Biological Sciences (JIBS) , Oak Ridge National Laboratory , Oak Ridge , Tennessee 37831 , United States. School of Engineering , Brown University , Providence , Rhode Island 02912 , United States" |
| ISSN/ISBN: | 1520-5851 (Electronic) 0013-936X (Linking) |
| Abstract: | "Thermal treatment of soil and groundwater may provide an in situ source of soluble organic compounds and hydrogen (H(2)) 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 degrees C for up to 180 d, leading to the release of direct electron donors (i.e., H(2) and acetate) and fermentable volatile fatty acids (VFAs). Total VFA release ranged from 5 +/- 0 x 10(-9) carbon per gram solid (mol C/g(s)) during 30 degrees C incubation of quartz sand to 820 +/- 50 x 10(-6) mol C/g(s) during 90 degrees C incubation of humic acid, and was positively impacted by incubation time, temperature, and solid-phase OC content. H(2) gas was detected at a maximum of 180 +/- 50 x 10(-9) mol H(2)/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 thermal treatment, supporting the implementation of coupled thermal and biological remediation strategies" |
| Keywords: | "Biodegradation, Environmental Electrons *Groundwater Hydrogen *Soil;" |
| Notes: | "MedlineMarcet, Tyler F Capiro, Natalie L Morris, Lawrence A Hassan, Sayed M Yang, Yi Loffler, Frank E Pennell, Kurt D eng Research Support, Non-U.S. Gov't 2018/03/09 Environ Sci Technol. 2018 Mar 20; 52(6):3642-3651. doi: 10.1021/acs.est.7b06014. Epub 2018 Mar 8" |
