干旱区生态环境知识资源中心(Arid): Flow dynamics and potential for Biodegradation of Organic Contaminants in Fractured Rock Vadose Zones

Arid

DOI	10.2172/6497
报告编号	LBNL--42587
来源ID	OSTI_ID: 6497
	Flow dynamics and potential for Biodegradation of Organic Contaminants in Fractured Rock Vadose Zones
	Geller, J.T.; Holman, H.-Y.; Su, T.-S.; Liou, M.S.; Conrad, M.S.; Pruess, K.; Hunter-Devera, J.C.
英文摘要	We present an experimental approach for investigating the potential for bioremediation of volatile organic chemicals (VOCs) in fractured-rock vadose zones. This approach is based on the coupling of fluid flow dynamics and biotransformation processes. Fluid flow and distribution within fracture networks may be a significant factor in the ability of microorganisms to degrade VOCs, as they affect the availability of substrate, moisture and nutrients. Biological activity can change liquid surface tension and generate biofilms that may change the nettability of solid surfaces, locally alter fracture permeability and redirect infiltrating liquids. Our approach has four components: (1) establishing a conceptual model for fluid and contaminant distribution in the geologic matrix of interest; (2) physical and numerical experiments of liquid seepage in the fracture plane; (3) non-destructive monitoring of biotransformations on rock surfaces at the micron-scale; and, (4) integration of flow and biological activity in natural rock ''geocosms''. Geocosms are core-scale flow cells that incorporate some aspects of natural conditions, such as liquid seepage in the fracture plane and moisture content. The experimental work was performed with rock samples and indigenous microorganisms from the site of the US Department of Energy's Idaho National Engineering and Environmental Laboratory (INEEL), located in a basalt flow basin where VOC contamination threatens the Snake River Aquifer. The insights gained from this approach should contribute to the design of techniques to monitor and stimulate naturally occurring biological activity and control the spread of organic contaminants.
出版年	1998
报告类型	Technical Report
语种	英语
国家	美国
来源学科分类	54 ENVIRONMENTAL SCIENCES ; 58 GEOSCIENCES ; BASALT ; BIODEGRADATION ; BIOREMEDIATION ; CONTAMINATION ; FLUID FLOW ; MICROORGANISMS ; MONITORING ; NUTRIENTS ; ORGANIC COMPOUNDS ; PERMEABILITY ; SURFACE TENSION ; VOLATILE MATTER
URL	http://www.osti.gov/scitech/servlets/purl/6497
资源类型	科技报告
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/267702
推荐引用方式 GB/T 7714	Geller, J.T.,Holman, H.-Y.,Su, T.-S.,et al. Flow dynamics and potential for Biodegradation of Organic Contaminants in Fractured Rock Vadose Zones,1998.