GSTDTAP  > 资源环境科学
DOI10.1029/2018WR023202
Development of a Fully Coupled Biogeochemical Reactive Transport Model to Simulate Microbial Oxidation of Organic Carbon and Pyrite Under Nitrate-Reducing Conditions
Knabe, Dustin1; Kludt, Christoph2,3; Jacques, Diederik4; Lichtner, Peter5,6; Engelhardt, Irina1
2018-11-01
发表期刊WATER RESOURCES RESEARCH
ISSN0043-1397
EISSN1944-7973
出版年2018
卷号54期号:11页码:9264-9286
文章类型Article
语种英语
国家Germany; Belgium; USA
英文摘要

In regions with intensive agriculture nitrate is one of the most relevant contaminants in groundwater. Denitrification reduces elevated nitrate concentrations in many aquifers, yet the denitrification potential is limited by the concentration of available electron donors. The aim of this work was to study the denitrification potential and its limitation in natural sediments. A column experiment was conducted using sediments with elevated concentrations of organic carbon (total organic carbon 3,247mg C/kg) and pyrite (chromium reducible sulfur 150mg/kg). Groundwater with high nitrate concentration (100mg/L) was injected. Measurements were taken over 160days at five different depths including N- and S-isotope analysis for selected samples. A reactive transport model was developed, which couples nitrate reduction with the oxidation of organic carbon (heterotrophic denitrification) and pyrite (autolithotrophic denitrification), and considers also transport and growth of denitrifying microbes. The denitrification pathway showed a temporal sequence from initially heterotrophic to autolithotrophic. However, maximum rates were lower for heterotrophic (11mmol N/(L*a)) than for autolithotrophic denitrification (48mmol N/(L*a)). The modeling showed that denitrifying microbes initially preferred highly reactive organic carbon as the electron donor for denitrification but were also able to utilize pyrite. The results show that after 160days nitrate increased again to 50mg/L. At this time only 0.5% of the total organic carbon and 46% of the available pyrite was oxidized. This indicates that denitrification rates strongly decrease before the electron donors are depleted either by a low reactivity (total organic carbon) or a diminishing reactive surface possibly due to the presence of coatings (pyrite).


英文关键词nitrate reduction pyrite oxidation HP1 sulfur isotopes
领域资源环境
收录类别SCI-E
WOS记录号WOS:000453369400039
WOS关键词OXYGEN-ISOTOPE FRACTIONATION ; POROUS-MEDIA ; GROUNDWATER DENITRIFICATION ; CHROMIUM REDUCTION ; SEDIMENTS ; NITROGEN ; WATER ; AQUIFER ; SULFUR ; ATTENUATION
WOS类目Environmental Sciences ; Limnology ; Water Resources
WOS研究方向Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/19982
专题资源环境科学
作者单位1.TU Berlin, Dept Hydrogeol, Berlin, Germany;
2.Hessian Agcy Nat Conservat Environm & Geol, Wiesbaden, Germany;
3.Tech Univ Darmstadt, Hydrogeol Dept, Inst Appl Geosci, Darmstadt, Germany;
4.Belgian Nucl Res Ctr SCK CEN, Inst Environm Hlth & Safety, Mol, Belgium;
5.Univ New Mexico, Ctr Water & Environm, Albuquerque, NM 87131 USA;
6.OFM Res Inc, Redmond, WA USA
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GB/T 7714
Knabe, Dustin,Kludt, Christoph,Jacques, Diederik,et al. Development of a Fully Coupled Biogeochemical Reactive Transport Model to Simulate Microbial Oxidation of Organic Carbon and Pyrite Under Nitrate-Reducing Conditions[J]. WATER RESOURCES RESEARCH,2018,54(11):9264-9286.
APA Knabe, Dustin,Kludt, Christoph,Jacques, Diederik,Lichtner, Peter,&Engelhardt, Irina.(2018).Development of a Fully Coupled Biogeochemical Reactive Transport Model to Simulate Microbial Oxidation of Organic Carbon and Pyrite Under Nitrate-Reducing Conditions.WATER RESOURCES RESEARCH,54(11),9264-9286.
MLA Knabe, Dustin,et al."Development of a Fully Coupled Biogeochemical Reactive Transport Model to Simulate Microbial Oxidation of Organic Carbon and Pyrite Under Nitrate-Reducing Conditions".WATER RESOURCES RESEARCH 54.11(2018):9264-9286.
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