DOI: 10.1016/j.watres.2018.07.076
Scopus记录号: 2-s2.0-85053042903
论文题名: Impacts of low-temperature thermal treatment on microbial detoxification of tetrachloroethene under continuous flow conditions
作者: Marcet T.F. ; Cápiro N.L. ; Yang Y. ; Löffler F.E. ; Pennell K.D.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 145 起始页码: 21
结束页码: 29
语种: 英语
英文关键词: Bioremediation
; Chlorinated solvents
; Combined remedies
; Dehalococcoides mccartyi
; Microbial reductive dechlorination
; Reductive dehalogenase genes
; Thermal treatment
Scopus关键词: Aquifers
; Bioremediation
; Chlorine compounds
; Dechlorination
; Degradation
; Detoxification
; Effluents
; Ethylene
; Genes
; Heat treatment
; Chlorinated solvent
; Combined remedies
; Dehalococcoides
; Microbial reductive dechlorination
; Reductive dehalogenases
; Temperature
; aquifer
; bacterium
; biodegradation
; bioremediation
; biotransformation
; cleanup
; dechlorination
; detoxification
; effluent
; gene
; low temperature
; microbial activity
; organic compound
; solvent
; temperature effect
; tetrachloroethylene
; thermophilic bacterium
; Dehalococcoides
英文摘要: Coupling in situ thermal treatment (ISTT) with microbial reductive dechlorination (MRD) has the potential to enhance contaminant degradation and reduce cleanup costs compared to conventional standalone remediation technologies. Impacts of low-temperature ISTT on Dehalococcoides mccartyi (Dhc), a relevant species in the anaerobic degradation of cis-1,2-dichloroethene (cis-DCE) and vinyl chloride (VC) to nontoxic ethene, were assessed in sand-packed columns under dynamic flow conditions. Dissolved tetrachloroethene (PCE; 258 ± 46 μM) was introduced to identical columns bioaugmented with the PCE-to-ethene dechlorinating consortium KB-1®. Initial column temperatures represented a typical aquifer (15 °C) or a site undergoing low-temperature ISTT (35 °C), and were subsequently increased to 35 and 74 °C, respectively, to assess temperature impacts on reductive dechlorination activity. In the 15 °C column, PCE was transformed primarily to cis-DCE (159 ± 2 μM), which was further degraded to VC (164 ± 3 μM) and ethene (30 ± 0 μM) within 17 pore volumes (PVs) after the temperature was increased to 35 °C. Regardless of the initial column temperature, ethene constituted >50 mol% of effluent degradation products in both columns after 73–74 PVs at 35 °C, indicating that MRD performance was greatly improved under low-temperature ISTT conditions. Increasing the temperature of the column initially at 35 °C resulted in continued VC and ethene production until a temperature of approximately 43 °C was reached, at which point Dhc activity substantially decreased. The abundance of the vcrA reductive dehalogenase gene exceeded that of the bvcA gene by 1–2.5 orders of magnitude at 15 °C, but this relationship inversed at temperatures >35 °C, suggesting Dhc strain-specific responses to temperature. These findings demonstrate improved MRD performance with low-temperature thermal treatment and emphasize potential synergistic effects at sites undergoing ISTT. © 2018 Elsevier Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112404
Appears in Collections: 气候减缓与适应
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作者单位: Department of Civil and Environmental Engineering, Tufts University, Medford, MA 02155, United States; Department of Civil and Environmental Engineering, University of Tennessee, Knoxville, TN 37996, United States; Department of Microbiology, University of Tennessee, Knoxville, TN 37996, United States; Department of Biosystems Engineering & Soil Science, University of Tennessee, Knoxville, TN 37996, United States; Center for Environmental Biotechnology, University of Tennessee, Knoxville, TN 37996, United States; Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, United States; School of Engineering, Brown University, Providence, RI 02912, United States
Recommended Citation:
Marcet T.F.,Cápiro N.L.,Yang Y.,et al. Impacts of low-temperature thermal treatment on microbial detoxification of tetrachloroethene under continuous flow conditions[J]. Water Research,2018-01-01,145