Utilize este identificador para referenciar este registo: https://hdl.handle.net/10216/106016
Autor(es): Maria A. P. Cechinel
Diego A. Mayer
Tatiana A. Pozdniakova
Luciana P. Mazur
Rui A. R. Boaventura
Antônio Augusto U. de Souza
Selene M. A. Guelli U. de Souza
Vítor J. P. Vilar
Título: Removal of metal ions from a petrochemical wastewater using brown macro-algae as natural cation-exchangers
Data de publicação: 2016
Resumo: Four brown macro-algae, Ascophyllum nodosum, Fucus spiralis, Laminaria hyperborea and Pelvetia canaliculata, were investigated as natural cation exchangers for the removal of transition metals from a petrochemical wastewater. The wastewater presents a high conductivity due to chloride, sulfate, sodium, calcium and residual concentrations of copper, zinc and nickel species. According to all-inorganic species evaluated, the molar fraction of Zn2+, Cu2+ and Ni2+ is near 92% and the remaining species are ZnCl+, ZnSO4, CuSO4, NiCl+ and NiSO4. A Langmuir multicomponent model was able to predict the ion-exchange equilibrium data for Cu, Ni, Zn and Ca species present in the petrochemical wastewater. L. hyperborea showed a higher uptake capacity than the other brown algae tested. The equilibrium affinity constants for the functional groups decreased in the following order: Cu > Zn > Ni approximate to Ca, except for L. hyperborea, which presents a lesser affinity for Ca. Ion-exchange breakthrough curves obtained from a fixed-bed column packed with raw L. hyperborea, led to an operating capacity of 0.22, 0.10 and 0.05 mEq/g for Cu, Zn and Ni, corresponding to 1558, 515, 528 BV (7.2 BV/h), respectively. The treatment strategy consisted in the operation of two consecutive columns, the first one for copper ions removal (operating capacity of 1558 BV - 7.2 BV/h) and the second one for zinc and nickel removal (operating capacity of 163 BV-7.3 BV/h). The elution of Cu, Zn and Ni from the natural resin was achieved with 10 and 6 BV of HCl (0.4 M, 1.2%) (150 and 90 g HCl/L of resin), using a flow rate of 3.6 BV/h, respectively for the first and second columns.
Assunto: Tecnologia ambiental, Engenharia do ambiente
Environmental technology, Environmental engineering
Áreas do conhecimento: Ciências da engenharia e tecnologias::Engenharia do ambiente
Engineering and technology::Environmental engineering
URI: https://hdl.handle.net/10216/106016
Informação Relacionada: info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e a Tecnologia/Projetos Estratégicos/UID/EQU/50020/2013- POCI-01-0145-FEDER-006984/Laboratório de Processos de Separação e Reação - Laboratório de Catálise e Materiais/LSRE-LCM
info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e a Tecnologia/Projectos de I&DT em Todos os Domínios Científicos/PTDC/AAG-TEC/2685/2012|FCOMP-01-0124-FEDER-027877/Valorização de macroalgas marinhas na separação e recuperação de iões metálicos tóxicos presentes em água/ALGAEVALUE
Tipo de Documento: Artigo em Revista Científica Internacional
Condições de Acesso: restrictedAccess
Aparece nas coleções:FEUP - Artigo em Revista Científica Internacional

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