The effects of preferential flow and soil texture on risk assessments of a NORM waste disposal site
Autor(a) principal: | |
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Data de Publicação: | 2009 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRJ |
Texto Completo: | http://hdl.handle.net/11422/8666 |
Resumo: | 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. |
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The effects of preferential flow and soil texture on risk assessments of a NORM waste disposal siteRadionuclide transportNORM wastesPreferential flowRisk assessmentSolid waste disposalCNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::AREAS CLASSICAS DE FENOMENOLOGIA E SUAS APLICACOES::DINAMICA DOS FLUIDOSThis 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.Indisponível.ElsevierBrasilNúcleo Interdisciplinar de Dinâmica dos Fluidos2019-07-04T17:16:11Z2023-12-21T03:01:02Z2009-10-09info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article0304-3894http://hdl.handle.net/11422/866610.1016/j.jhazmat.2009.09.100engJournal of Hazardous MaterialsPontedeiro, Elizabeth May Braga DulleyVan Genuchten, Martinus TheodorusCotta, Renato MachadoSimunek, Jiriinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRJinstname:Universidade Federal do Rio de Janeiro (UFRJ)instacron:UFRJ2023-12-21T03:01:02Zoai:pantheon.ufrj.br:11422/8666Repositório InstitucionalPUBhttp://www.pantheon.ufrj.br/oai/requestpantheon@sibi.ufrj.bropendoar:2023-12-21T03:01:02Repositório Institucional da UFRJ - Universidade Federal do Rio de Janeiro (UFRJ)false |
dc.title.none.fl_str_mv |
The effects of preferential flow and soil texture on risk assessments of a NORM waste disposal site |
title |
The effects of preferential flow and soil texture on risk assessments of a NORM waste disposal site |
spellingShingle |
The effects of preferential flow and soil texture on risk assessments of a NORM waste disposal site Pontedeiro, Elizabeth May Braga Dulley Radionuclide transport NORM wastes Preferential flow Risk assessment Solid waste disposal CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::AREAS CLASSICAS DE FENOMENOLOGIA E SUAS APLICACOES::DINAMICA DOS FLUIDOS |
title_short |
The effects of preferential flow and soil texture on risk assessments of a NORM waste disposal site |
title_full |
The effects of preferential flow and soil texture on risk assessments of a NORM waste disposal site |
title_fullStr |
The effects of preferential flow and soil texture on risk assessments of a NORM waste disposal site |
title_full_unstemmed |
The effects of preferential flow and soil texture on risk assessments of a NORM waste disposal site |
title_sort |
The effects of preferential flow and soil texture on risk assessments of a NORM waste disposal site |
author |
Pontedeiro, Elizabeth May Braga Dulley |
author_facet |
Pontedeiro, Elizabeth May Braga Dulley Van Genuchten, Martinus Theodorus Cotta, Renato Machado Simunek, Jiri |
author_role |
author |
author2 |
Van Genuchten, Martinus Theodorus Cotta, Renato Machado Simunek, Jiri |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Pontedeiro, Elizabeth May Braga Dulley Van Genuchten, Martinus Theodorus Cotta, Renato Machado Simunek, Jiri |
dc.subject.por.fl_str_mv |
Radionuclide transport NORM wastes Preferential flow Risk assessment Solid waste disposal CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::AREAS CLASSICAS DE FENOMENOLOGIA E SUAS APLICACOES::DINAMICA DOS FLUIDOS |
topic |
Radionuclide transport NORM wastes Preferential flow Risk assessment Solid waste disposal CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA::AREAS CLASSICAS DE FENOMENOLOGIA E SUAS APLICACOES::DINAMICA DOS FLUIDOS |
description |
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. |
publishDate |
2009 |
dc.date.none.fl_str_mv |
2009-10-09 2019-07-04T17:16:11Z 2023-12-21T03:01:02Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
0304-3894 http://hdl.handle.net/11422/8666 10.1016/j.jhazmat.2009.09.100 |
identifier_str_mv |
0304-3894 10.1016/j.jhazmat.2009.09.100 |
url |
http://hdl.handle.net/11422/8666 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of Hazardous Materials |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Elsevier Brasil Núcleo Interdisciplinar de Dinâmica dos Fluidos |
publisher.none.fl_str_mv |
Elsevier Brasil Núcleo Interdisciplinar de Dinâmica dos Fluidos |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UFRJ instname:Universidade Federal do Rio de Janeiro (UFRJ) instacron:UFRJ |
instname_str |
Universidade Federal do Rio de Janeiro (UFRJ) |
instacron_str |
UFRJ |
institution |
UFRJ |
reponame_str |
Repositório Institucional da UFRJ |
collection |
Repositório Institucional da UFRJ |
repository.name.fl_str_mv |
Repositório Institucional da UFRJ - Universidade Federal do Rio de Janeiro (UFRJ) |
repository.mail.fl_str_mv |
pantheon@sibi.ufrj.br |
_version_ |
1815455992058478592 |