Recovery of lanthanides from hydrocarbon cracking spent catalyst through chemical and biotechnological strategies.
J Environ Sci Health A Tox Hazard Subst Environ Eng
; 54(7): 686-693, 2019.
Article
em En
| MEDLINE
| ID: mdl-30821628
The aim of this work is to evaluate the rare earth elements (REEs) recovery from fluid catalytic cracking spent catalyst (FCC-SC) by chemical and biochemical strategies while also examining a route for the valorization of biodiesel-derived glycerin (RG), which is presently unprofitable to refine. Recovery tests for REEs were performed with no pretreatment of the FCC-SC. A chemical leaching investigation was carried out using HCl, HNO3, NaOH, CaCl2 and citric acid aqueous solutions (1 mol L-1, at 30, 50, 60 or 70 ± 1 °C). The leaching tests carried out with 1 mol L-1 citric acid at 50 °C provided the best recovery of La (27%). Subsequent bioleaching tests were carried out with four strains of Yarrowia lipolytica to evaluate their potential to produce organic acids using RG as the main carbon source. The FCC-SC contains some REEs, predominantly La. Remarkable biorecovery rates for REEs (namely, La (53%), Ce and Nd (both 99%)) were achieved using the Y. lipolytica IM-UFRJ 50678 fermented medium at 50 °C. Thus, here, a sustainable approach to recovering metals from spent cracking catalyst using RG under low-cost and non-energy-intensive processing conditions is reported.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Biotecnologia
/
Eliminação de Resíduos
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Yarrowia
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Elementos da Série dos Lantanídeos
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Indústria de Petróleo e Gás
Idioma:
En
Revista:
J Environ Sci Health A Tox Hazard Subst Environ Eng
Assunto da revista:
TOXICOLOGIA
Ano de publicação:
2019
Tipo de documento:
Article
País de afiliação:
Brasil
País de publicação:
Reino Unido