| DOI: | 10.2172/1110400
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| 报告号: | DOE-CU-Denver-0006962-01
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| 报告题名: | Linking deposit morphology and clogging in subsurface remediation: Final Technical Report |
| 作者: | Mays, David C. [University of Colorado Denver]
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| 出版年: | 2013
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| 发表日期: | 2013-12-11
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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: | groundwater
; remediation
; permeability
; clogging
; colloids
; fractal
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| 中文主题词: | 悬浮物
; 污染物
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| 主题词: | SUSPENDED SOLIDS
; CONTAMINANTS
|
| 英文摘要: | Groundwater is a crucial resource for water supply, especially in arid and semiarid areas of the United States west of the 100th meridian. Accordingly, remediation of contaminated groundwater is an important application of science and technology, particularly for the U.S. Department of Energy (DOE), which oversees a number of groundwater remediation sites from Cold War era mining. Groundwater remediation is complex, because it depends on identifying, locating, and treating contaminants in the subsurface, where remediation reactions depend on interacting geological, hydrological, geochemical, and microbiological factors. Within this context, permeability is a fundamental concept, because it controls the rates and pathways of groundwater flow. Colloid science is intimately related to permeability, because when colloids are present (particles with equivalent diameters between 1 nanometer and 10 micrometers), changes in hydrological or geochemical conditions can trigger a detrimental reduction in permeability called clogging. Accordingly, clogging is a major concern in groundwater remediation. Several lines of evidence suggest that clogging by colloids depends on (1) colloid deposition, and (2) deposit morphology, that is, the structure of colloid deposits, which can be quantified as a fractal dimension. This report describes research, performed under a 2-year, exploratory grant from the DOEâs Subsurface Biogeochemical Research (SBR) program. This research employed a novel laboratory technique to simultaneously measure flow, colloid deposition, deposit morphology, and permeability in a flow cell, and also collected field samples from wells at the DOEâs Old Rifle remediation site. Field results indicate that suspended solids at the Old Rifle site have fractal structures. Laboratory results indicate that clogging is associated with colloid deposits with smaller fractal dimensions, in accordance with previous studies on initially clean granular media. Preliminary modeling has identified the deposit radius of gyration as a candidate variable to account for clogging as a function of (1) colloid accumulation and (2) deposit morphology. |
| URL: | http://www.osti.gov/scitech/servlets/purl/1110400
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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/40879
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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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Version |
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| 1110400.pdf（234KB） | 研究报告 | -- | 开放获取 | | View
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| Recommended Citation: | |
Mays, David C. [University of Colorado Denver]. Linking deposit morphology and clogging in subsurface remediation: Final Technical Report. 2013-01-01.
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