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2022-06-17
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Resumen
Spent caustic effluents are very challenging due to their very hazardous nature in terms of toxicity as well as their extreme pH (approximately 12–14). Spent caustic has presented a challenge for wastewater treatment in refineries, due to its composition rich in mercaptans, sulfides and other aromatic compounds. To address such problems, membrane filtration was studied using real effluents from Sines Refinery, in Portugal. The present study attempts to assess the potential for spent caustic treatment with nanofiltration (NF) polymeric and ceramic membranes, assessing membrane life expectancy. For that, membrane aging studies in static mode were performed with the polymeric membrane before attempting NF treatment (dynamic studies). A ceramic membrane was also tested for the first time with this type of effluents, though only in dynamic mode. Although the polymeric membrane performance was very good and in accordance with previous studies, its lifespan was very reduced after 6 weeks of contact with spent caustic, compromising its use in an industrial unit. Contrarily to expectations, the ceramic membrane tested was not chemically more resistant than the polymeric one upon direct contact with spent caustic (loss of retention capacity in less than 1 h in contact with the spent caustic). The results obtained suggest that a pH of 13.9 is very aggressive, even for ceramic membranes.
Descripción
The registered version of this article, first published in Membranes, 12(1), 98, is available online at the publisher's website: https://doi.org/10.3390/membranes12010098
La versión registrada de este artículo, publicado por primera vez en Membranes, 13(4), 98, está disponible en línea en el sitio web del editor: https://doi.org/10.3390/membranes12010098
The present work was co-financially supported by Fundação para a Ciência e Tecnologia (FCT) within the program Human Capital Operational Programme (HCOP) (co-financed by PT2020 and European Social Funds) and national funds from MCTES and Galp group, through the grant PD/BDE/114356/2016. iNOVA4Health-UID/Multi/04462/2013, a program financially supported by Fundação para a Ciência e Tecnologia/Ministério da Educação e Ciência, through national funds and co-funded by FEDER under the PT2020 Partnership Agreement, and funding from INTERFACE Programme, through the Innovation, Technology and Circular Economy Fund (FITEC), are gratefully acknowledged. This work was supported by the Associate Laboratory for Green Chemistry (LAQV), which is financed by national funds from FCT/MCTES (UIDB/50006/2020). This work was also financially supported by Base Funding-UIDB/00511/2020 of the Laboratory for Process Engineering, Environment, Biotechnology and Energy (LEPABE) funded by national funds through FCT/MCTES (PIDDAC).
La versión registrada de este artículo, publicado por primera vez en Membranes, 13(4), 98, está disponible en línea en el sitio web del editor: https://doi.org/10.3390/membranes12010098
The present work was co-financially supported by Fundação para a Ciência e Tecnologia (FCT) within the program Human Capital Operational Programme (HCOP) (co-financed by PT2020 and European Social Funds) and national funds from MCTES and Galp group, through the grant PD/BDE/114356/2016. iNOVA4Health-UID/Multi/04462/2013, a program financially supported by Fundação para a Ciência e Tecnologia/Ministério da Educação e Ciência, through national funds and co-funded by FEDER under the PT2020 Partnership Agreement, and funding from INTERFACE Programme, through the Innovation, Technology and Circular Economy Fund (FITEC), are gratefully acknowledged. This work was supported by the Associate Laboratory for Green Chemistry (LAQV), which is financed by national funds from FCT/MCTES (UIDB/50006/2020). This work was also financially supported by Base Funding-UIDB/00511/2020 of the Laboratory for Process Engineering, Environment, Biotechnology and Energy (LEPABE) funded by national funds through FCT/MCTES (PIDDAC).
Categorías UNESCO
Palabras clave
naphthenic spent caustic effluent, nanofiltration, aging, ceramic vs, polymeric membranes
Citación
Rita, A. I., Nabais, A. R., Neves, L. A., Huertas, R., Santos, M., Madeira, L. M., & Sanches, S. (2022). Assessment of the Potential of Using Nanofiltration Polymeric and Ceramic Membranes to Treat Refinery Spent Caustic Effluents. Membranes, 12(1). https://doi.org/10.3390/MEMBRANES12010098
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Facultad de Ciencias
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Ciencias y Técnicas Fisicoquímicas