| DOI: | 10.2172/1107346
|
| 报告号: | DOE-UIDAHO-SC0006609-01
|
| 报告题名: | Final report for DOE Grant No. DE-SC0006609 - Persistence of Microbially Facilitated Calcite Precipitation as an in situ Treatment for Strontium-90 |
| 作者: | Smith, Robert W [University of Idaho]; Fujita, Yoshiko [Idaho National Laboratory]
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| 出版年: | 2013
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| 发表日期: | 2013-11-15
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| 总页数: | 33
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| 国家: | 美国
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| 语种: | 英语
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| 英文关键词: | bioremediation
; strontium-90
; Calcite
; urea hydrolysis
; ureC
; urease
|
| 中文主题词: | 钙
; 碳
; 降水
; 碳酸酯
; 污染物
|
| 主题词: | CALCIUM
; CARBON
; PRECIPITATION
; CARBONATE
; CONTAMINANTS
|
| 英文摘要: | Subsurface radionuclide and metal contaminants throughout the U.S. Department of Energy (DOE) complex pose one of DOE's greatest challenges for long-term stewardship. One promising stabilization mechanism for divalent ions, such as the short-lived radionuclide Sr-90, is co-precipitation in calcite. We have previously found that nutrient addition can stimulate microbial ureolytic activity, that this activity accelerates calcite precipitation and co-precipitation of Sr, and that higher calcite precipitation rates can result in increased Sr partitioning. We have conducted integrated field, laboratory, and computational research to evaluate the relationships between ureolysis and calcite precipitation rates and trace metal partitioning under environmentally relevant conditions, and investigated the coupling between flow/flux manipulations and precipitate distribution. A field experimental campaign conducted at the Integrated Field Research Challenge (IFRC) site located at Rifle, CO was based on a continuous recirculation design; water extracted from a down-gradient well was amended with urea and molasses (a carbon and electron donor) and re-injected into an up-gradient well. The goal of the recirculation design and simultaneous injection of urea and molasses was to uniformly accelerate the hydrolysis of urea and calcite precipitation over the entire inter-wellbore zone. The urea-molasses recirculation phase lasted, with brief interruptions for geophysical surveys, for 12 days and was followed by long-term monitoring which continued for 13 months. A post experiment core located within the inter-wellbore zone was collected on day 321 and characterized with respect to cation exchange capacity, mineral carbonate content, urease activity, ureC gene abundance, extractable ammonium (a urea hydrolysis product) content, and the C-13 isotopic composition of solid carbonates. It was also subjected to selective extractions for strontium and uranium. Result of the core characterization suggest that urea hydrolysis occurred primarily within the upper portion of the inter-wellbore zone and that strontium was mobilized from cation exchange sites and subsequently co-precipitated with new calcium carbonate. |
| URL: | http://www.osti.gov/scitech/servlets/purl/1107346
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| Citation statistics: |
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| 资源类型: | 研究报告
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/40912
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| Appears in Collections: | 过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响
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| File Name/ File Size |
Content Type |
Version |
Access |
License |
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| 1107346.pdf（1292KB） | 研究报告 | -- | 开放获取 | | View
Download
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| Recommended Citation: | |
Smith, Robert W [University of Idaho],Fujita, Yoshiko [Idaho National Laboratory]. Final report for DOE Grant No. DE-SC0006609 - Persistence of Microbially Facilitated Calcite Precipitation as an in situ Treatment for Strontium-90. 2013-01-01.
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