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Type: Artigo
Title: The effects of preferential flow and soil texture on risk assessments of a NORM waste disposal site
Author(s)/Inventor(s): Pontedeiro, Elizabeth May Braga Dulley
Van Genuchten, Martinus Theodorus
Cotta, Renato Machado
Simunek, Jiri
Abstract: Indisponível.
Abstract: This paper investigates the environmental fate of radionuclide decay chains (specially the 238U and 232Th series) being released from a conventional mining installation processing ore containing natural occurring radioactive materials (NORMs). Contaminated waste at the site is being disposed off in an industrial landfill on top of a base of earth material to ensure integrity of the deposit over relatively long geologic times (thousands of years). Brazilian regulations, like those of many other countries, require a performance assessment of the disposal facility using a leaching and off-site transport scenario. We used for this purpose the HYDRUS-1D software package to predict long-term radionuclide transport vertically through both the landfill and the underlying unsaturated zone, and then laterally in groundwater. We assumed that a downgradient well intercepting groundwater was the only source of water for a resident farmer, and that all contaminated water from the well was somehow used in the biosphere. The risk assessment was carried out for both a best-case scenario assuming equilibrium transport in a fine-textured (clay) subsurface, and a worst-case scenario involving preferential flow through a more coarse-textured subsurface. Results show that preferential flow and soil texture both can have a major effect on the results, depending upon the specific radionuclide involved.
Keywords: Radionuclide transport
NORM wastes
Preferential flow
Risk assessment
Solid waste disposal
Production unit: Núcleo Interdisciplinar de Dinâmica dos Fluidos
Publisher: Elsevier
In: Journal of Hazardous Materials
Volume: 174
Issue: 1-3
Issue Date: 9-Oct-2009
DOI: 10.1016/j.jhazmat.2009.09.100
Publisher country: Brasil
Language: eng
Right access: Acesso Aberto
ISSN: 0304-3894
Appears in Collections:Engenharias

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