Integral transform analysis of radionuclide transport in variably saturated media using a physical non-equilibrium model: Application to solid waste leaching at a uranium mining installation

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dc.contributor.authorCotta, Renato Machado
dc.contributor.authorNaveira-Cotta, Carolina P.
dc.contributor.authorvan Genuchten, Martinus T. [UNESP]
dc.contributor.authorSu, Jian
dc.contributor.authorQuaresma, João N.N.
dc.contributor.institutionFederal University of Rio de Janeiro
dc.contributor.institutionDGDNTM
dc.contributor.institutionUniversidade Federal do Rio de Janeiro (UFRJ)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade Federal do Pará (UFPA)
dc.date.accessioned2020-12-12T01:21:06Z
dc.date.available2020-12-12T01:21:06Z
dc.date.issued2020-01-01
dc.description.abstractThe Generalized Integral Transform Technique (GITT) was employed to simulate transient one-dimensional flow in variably saturated porous media, as well as radioactive waste transport within different layers (a solid waste pile, nearby soil, and a granular aquifer) towards the edge of a uranium mining installation under institutional control. Computational codes, written using the Mathematica software system, were implemented and tested for solution of the coupled advection-dispersion equations for an arbitrary number of daughter products within a radioactive chain migrating in saturated and unsaturated soil layers. The computer simulations were verified in great detail against results obtained using the built-in routine NDSolve of the Mathematica platform and the HYDRUS-1D software system. The present work reports the main results for 238U chain radionuclide transport using data extracted from a safety assessment of solid waste repositories at a uranium mining and milling installation in Caetité, state of Bahia, Brazil, operated by INB (Indústrias Nucleares do Brasil). Concentration evolutions of the various radionuclides obtained with the simulations were analyzed for five different cases to explore variations in the infiltration and recharge rates, the effect of assuming physical equilibrium or non-equilibrium transport conditions, and of different initial concentrations of some of the radionuclides.en
dc.description.affiliationLabMEMS Mechanical Eng. Dept. POLI & COPPE Federal University of Rio de Janeiro, Rua Muniz de Aragão, no. 360, Bloco 4, CT-2, Cidade Universitária
dc.description.affiliationGeneral Directorate for Nuclear and Technological Development DGDNTM, Brazilian Navy, Ed. 23 do AMRJ, Rua da Ponte, s/n, Centro
dc.description.affiliationNuclear Eng. Dept. POLI & COPPE Federal University of Rio de Janeiro UFRJ, Rua Horácio Macedo, Bloco G, Cidade Universitária
dc.description.affiliationCenter for Environmental Studies CEA São Paulo State University UNESP, R. 16 B, 99-193, Bela Vista
dc.description.affiliationChemical Eng. Dept. Federal University of Pará UFPA Instituto de Tecnologia, Campus Guamá
dc.description.affiliationUnespCenter for Environmental Studies CEA São Paulo State University UNESP, R. 16 B, 99-193, Bela Vista
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ)
dc.identifierhttp://dx.doi.org/10.1590/0001-3765202020190427
dc.identifier.citationAnais da Academia Brasileira de Ciencias, v. 92, n. 1, 2020.
dc.identifier.doi10.1590/0001-3765202020190427
dc.identifier.fileS0001-37652020000101102.pdf
dc.identifier.issn1678-2690
dc.identifier.issn0001-3765
dc.identifier.scieloS0001-37652020000101102
dc.identifier.scopus2-s2.0-85083572005
dc.identifier.urihttp://hdl.handle.net/11449/198751
dc.language.isoeng
dc.relation.ispartofAnais da Academia Brasileira de Ciencias
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectGeneralized Integral Transform Technique (GITT)
dc.subjectHybrid methods
dc.subjectPhysical non-equilibrium transport
dc.subjectRadioactive waste leaching
dc.subjectUnsaturated porous media
dc.subjectUranium mining
dc.titleIntegral transform analysis of radionuclide transport in variably saturated media using a physical non-equilibrium model: Application to solid waste leaching at a uranium mining installationen
dc.typeArtigo
unesp.author.orcid0000-0003-0965-0811 0000-0003-0965-0811[1]
unesp.author.orcid0000-0001-8073-5602[2]
unesp.author.orcid0000-0003-1654-8858 0000-0003-1654-8858[3]
unesp.author.orcid0000-0001-7853-1088[4]
unesp.author.orcid0000-0001-9365-7498[5]

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