DOI: 10.1016/j.watres.2018.07.039
Scopus记录号: 2-s2.0-85053162153
论文题名: A horizontal permeable reactive barrier stimulates nitrate removal and shifts microbial ecology during rapid infiltration for managed recharge
作者: Beganskas S. ; Gorski G. ; Weathers T. ; Fisher A.T. ; Schmidt C. ; Saltikov C. ; Redford K. ; Stoneburner B. ; Harmon R. ; Weir W.
刊名: Water Research
ISSN: 431354
出版年: 2018
卷: 144 起始页码: 274
结束页码: 284
语种: 英语
英文关键词: Denitrification
; Infiltration
; Managed aquifer recharge
; Nitrate reduction
; Permeable reactive barrier
; Soil microbiology
Scopus关键词: Aquifers
; Bacteria
; Denitrification
; Ecology
; Nitrates
; Organic carbon
; Recharging (underground waters)
; Soils
; Water quality
; Denitrifying bacteria
; Dissolved organic carbon
; Favorable conditions
; Isotopic enrichment
; Managed aquifer recharges
; Nitrate reduction
; Permeable reactive barriers
; Soil microbiology
; Infiltration
; bacterium
; concentration (composition)
; dissolved organic carbon
; experimental study
; infiltration
; microbial ecology
; nitrate
; permeability
; pollutant removal
; reactive barrier
; recharge
; reduction
; residence time
; Methylotenera
; Microbacterium
; Novosphingobium
; Polaromonas
英文摘要: We present results from field experiments linking hydrology, geochemistry, and microbiology during infiltration at a field site that is used for managed aquifer recharge (MAR). These experiments measured how a horizontal permeable reactive barrier (PRB) made of woodchips impacted subsurface nitrate removal and microbial ecology. Concentrations of dissolved organic carbon consistently increased in infiltrating water below the PRB, but not in un-amended native soil. The average nitrate removal rate in soils below the PRB was 1.5 g/m2/day NO3-N, despite rapid infiltration (up to 1.9 m/d) and a short fluid residence time within the woodchips (≤6 h). In contrast, 0.09 g/m2/day NO3-N was removed on average in native soil. Residual nitrate in infiltrating water below the PRB was enriched in δ15N and δ18O, with low and variable isotopic enrichment factors that are consistent with denitrification during rapid infiltration. Many putative denitrifying bacteria were significantly enhanced in the soil below a PRB; Methylotenera mobilis and genera Microbacterium, Polaromonas, and Novosphingobium had log2 fold-changes of +4.9, +5.6, +7.2, and +11.8, respectively. These bacteria were present before infiltration and were not enhanced in native soil. It appears that the woodchip PRB contributed to favorable conditions in the underlying soil for enhanced nitrate removal, quantitatively shifting soil microbial ecology. These results suggest that using a horizontal PRB could improve water quality during rapid infiltration for MAR. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112486
Appears in Collections: 气候减缓与适应
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作者单位: Earth and Planetary Sciences, University of California Santa Cruz, Santa Cruz, CA 95064, United States; Microbiology and Environmental Toxicology, University of California Santa Cruz, Santa Cruz, CA 95064, United States; Environmental Science, University of San Francisco, San Francisco, CA 94117, United States; Hydrologic Science and Engineering, Colorado School of Mines, Golden, Colorado 80401, United States; Hydrologic Sciences, University of Nevada Reno, Reno, NV 89557, United States
Recommended Citation:
Beganskas S.,Gorski G.,Weathers T.,et al. A horizontal permeable reactive barrier stimulates nitrate removal and shifts microbial ecology during rapid infiltration for managed recharge[J]. Water Research,2018-01-01,144