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Release of Electron Donors during Thermal Treatment of Soils
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2018-03-08 00:00:00 , DOI: 10.1021/acs.est.7b06014 Tyler F. Marcet 1 , Natalie L. Cápiro 1 , Lawrence A. Morris , Sayed M. Hassan , Yi Yang , Frank E. Löffler 2 , Kurt D. Pennell 3
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2018-03-08 00:00:00 , DOI: 10.1021/acs.est.7b06014 Tyler F. Marcet 1 , Natalie L. Cápiro 1 , Lawrence A. Morris , Sayed M. Hassan , Yi Yang , Frank E. Löffler 2 , Kurt D. Pennell 3
Affiliation
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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.
中文翻译：
土壤热处理过程中电子给体的释放
对土壤和地下水的热处理可能会提供可溶有机化合物和氢（H 2）的原位来源，可在受氯化溶剂影响的位置刺激微生物还原性脱氯（MRD）。这项研究的目的是鉴定和量化土壤加热过程中电子供体和可发酵前体的释放，并评估热处理后这些化合物的可用性。将含有<0.01至63.81 wt％有机碳（OC）的十四种固体材料在30、60或90°C下孵育长达180 d，导致直接电子给体（即H 2和乙酸盐）的释放和可发酵挥发性脂肪酸（VFA）。VFA总释放量为5±0×10 –9石英砂在30°C孵化过程中每克固体的碳含量（mol C / g s）至腐殖酸90°C孵化过程中的820±50×10 –6 mol C / g s，并且受孵化时间，温度的影响以及固相OC含量。检测到的H 2气体最高值为180±50×10 –9 mol H 2 / g s，占在相同条件下释放的VFA相关还原当量的不到0.3％。这些发现将有助于更可靠地预测热处理过程中的底物释放，从而支持热与生物修复策略的联合实施。
更新日期：2018-03-08
中文翻译：
土壤热处理过程中电子给体的释放
对土壤和地下水的热处理可能会提供可溶有机化合物和氢（H 2）的原位来源，可在受氯化溶剂影响的位置刺激微生物还原性脱氯（MRD）。这项研究的目的是鉴定和量化土壤加热过程中电子供体和可发酵前体的释放，并评估热处理后这些化合物的可用性。将含有<0.01至63.81 wt％有机碳（OC）的十四种固体材料在30、60或90°C下孵育长达180 d，导致直接电子给体（即H 2和乙酸盐）的释放和可发酵挥发性脂肪酸（VFA）。VFA总释放量为5±0×10 –9石英砂在30°C孵化过程中每克固体的碳含量（mol C / g s）至腐殖酸90°C孵化过程中的820±50×10 –6 mol C / g s，并且受孵化时间，温度的影响以及固相OC含量。检测到的H 2气体最高值为180±50×10 –9 mol H 2 / g s，占在相同条件下释放的VFA相关还原当量的不到0.3％。这些发现将有助于更可靠地预测热处理过程中的底物释放，从而支持热与生物修复策略的联合实施。
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