Removal of metal ions from a petrochemical wastewater using brown macro-algae as natural cation-exchangers
| Autor: | Maria Alice Prado Cechinel, Rui A.R. Boaventura, Selene M.A. Guelli U. de Souza, Diego A. Mayer, Tatiana A. Pozdniakova, Luciana P. Mazur, Antônio Augusto Ulson de Souza, Vítor J.P. Vilar |
|---|---|
| Přispěvatelé: | Faculdade de Engenharia |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Langmuir
Environmental engineering [Engineering and technology] General Chemical Engineering Metal ions in aqueous solution 0211 other engineering and technologies chemistry.chemical_element 02 engineering and technology Zinc 010501 environmental sciences 01 natural sciences Chloride Industrial and Manufacturing Engineering Tecnologia ambiental Engenharia do ambiente medicine Environmental Chemistry 0105 earth and related environmental sciences 021110 strategic defence & security studies Chromatography biology General Chemistry biology.organism_classification Copper Engenharia do ambiente [Ciências da engenharia e tecnologias] Nickel Laminaria hyperborea chemistry Wastewater Environmental technology Environmental engineering Nuclear chemistry medicine.drug |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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