Pore-Water Extraction Intermediate-Scale Laboratory Experiments and Numerical Simulations

doi:10.2172/1029434

GSTDTAP > 地球科学

DOI	10.2172/1029434
报告编号	PNNL-20507
来源ID	OSTI ID: 1029434
	Pore-Water Extraction Intermediate-Scale Laboratory Experiments and Numerical Simulations
	Cecilia Nelson; Ashok Ghosh
	2011-06-30
出版年	2011
语种	英语
国家	美国
领域	地球科学
英文摘要	A series of flow cell experiments was conducted to demonstrate the process of water removal through pore-water extraction in unsaturated systems. In this process, a vacuum (negative pressure) is applied at the extraction well establishing gas and water pressure gradients towards the well. The gradient may force water and dissolved contaminants, such as 99Tc, to move towards the well. The tested flow cell configurations consist of packings, with or without fine-grained well pack material, representing, in terms of particle size distribution, subsurface sediments at the SX tank farm. A pore water extraction process should not be considered to be equal to soil vapor extraction because during soil vapor extraction, the main goal may be to maximize gas removal. For pore water extraction systems, pressure gradients in both the gas and water phases need to be considered while for soil vapor extraction purposes, gas phase flow is the only concern. In general, based on the limited set (six) of flow experiments that were conducted, it can be concluded that pore water extraction rates and cumulative outflow are related to water content, the applied vacuum, and the dimensions of the sediment layer providing the extracted water. In particular, it was observed that application of a 100-cm vacuum (negative pressure) in a controlled manner leads to pore-water extraction until the water pressure gradients towards the well approach zero. Increased cumulative outflow was obtained with an increase in initial water content from 0.11 to 0.18, an increase in the applied vacuum to 200 cm, and when the water-supplying sediment was not limited. The experimental matrix was not sufficiently large to come to conclusions regarding maximizing cumulative outflow.
英文关键词	pore water extraction intermediate-scale experiments Environmental Molecular Sciences Laboratory
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来源平台	US Department of Energy (DOE)
引用统计
文献类型	科技报告
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/5421
专题	地球科学
推荐引用方式 GB/T 7714	Cecilia Nelson,Ashok Ghosh. Pore-Water Extraction Intermediate-Scale Laboratory Experiments and Numerical Simulations,2011.