Microbial Response to the Shut-off of a Continuous Ethanol Blend Release and Persistent Methanogenesis Post Ethanol Removal
A pilot-scale (8 m3) model aquifer was used to investigate changes in the concentrations of ethanol and its metabolites (i.e., acetate, propionate, butyrate, butanol, and methane) after removal of the contamination source.Following the shut-off of a continuous release of an ethanol blend fuel, fermentation activity was surprisingly stimulated and the concentrations of ethanol metabolites increased.A microcosm experiment showed that this result was due to a decrease in the dissolved ethanol concentration below its toxicity threshold (~2,000 mg/L).Methane generation and methanogenesis functional genes persisted for more than 100 days after the disappearance of ethanol,which was apparently due to the anaerobic degradation of soil-bound organic carbon.Overall, this study reflects the complex plume dynamics following source removal, and suggests that monitoring for increases in the concentration of ethanol metabolites that impact groundwater quality should be considered.
fermentation methanogenesis groundwater
Jie Ma Pedro Alvarez
Department of Environmental Engineering, China University of Petroleum, Beijing, 102249, China;Depar Department of Civil and Environmental Engineering;Rice University,Houston,TX77005 USA
国际会议
北京
英文
215-216
2017-11-09(万方平台首次上网日期,不代表论文的发表时间)