Experimental and numerical investigations of effect of column length on retardation factor determination: A case study of cesium transport in crushed granite

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题名:	Experimental and numerical investigations of effect of column length on retardation factor determination: A case study of cesium transport in crushed granite
作者:	Li,MH;Wang,TH;Teng,SP
贡献者:	水文科學研究所
关键词:	REACTIVE TRANSPORT;SUBSURFACE SEDIMENTS;HANFORD SITE;MODEL;SORPTION;SAND;USA;DIFFUSION;STRONTIUM;CATION
日期:	2009
上传时间:	2010-07-08 09:29:41 (UTC+8)
出版者:	中央大學
摘要:	This study investigated breakthrough curves (BTCs) from a series of column experiments, including different column lengths and flow rates, of a conservative tracer, tritium oxide (HTO), and a radionuclide, cesium, in crushed granite using a reactive transport model. Results of the short column, with length of 2 cm, showed an underestimation of the retardation factor and the corresponding HTO BTCs cannot be successfully modeled even with overestimated fluid dispersivity. Column supporting elements, including filters and rings, on both ends of packed granite were shown to be able to induce additional dispersive mixing, thus significantly affecting BTCs of short columns while those of the long column, with length of 8 cm, were less affected. By increasing flow rates from 1 mL/min to 5 mL/min, the contribution of structural dispersive mixing to the false tilting of short column BTCs still cannot be detached. To reduce the influence of structural dispersivity on BTCs, the equivalent pore volume of column supporting materials should be much smaller than that of packed porous medium. The total length of column supporting structures should be greatly shorter than that of porous medium column. (c) 2008 Elsevier B.V. All rights reserved.
關聯:	JOURNAL OF HAZARDOUS MATERIALS
显示于类别:	[水文與海洋科學研究所] 期刊論文

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