Nanofiltration
Mostrando 1-12 de 29 artigos, teses e dissertações.
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1. Gas permeability and compressive strength evaluation of porous Al2O3 supported membrane
Abstract The aim was to investigate the feasibility of using a device to characterize permeability in porous substrates with low gas flux. Al2O3 supports were prepared by dry pressing using 1 to 3 wt% of polyethylene glycol (PEG) as a pore-forming agent. The green body was partially sintered at 1300 ºC. CO2 gas was used to measure both the pressure loss and
Cerâmica. Publicado em: 2022
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2. MODELLING ION TRANSPORT IN AN AMINE SOLUTION THROUGH A NANOFILTRATION MEMBRANE
Abstract The performance of a flat sheet polyamide nanofiltration membrane in rejection of a binary mixture of heat stable salts (acetate and sulfate) from methyl-diethanolamine (MDEA) solution was investigated. The effects of pressure and concentration of MDEA solution on rejection of acetate and sulfate ions were studied. At MDEA concentration of 20% wt. a
Braz. J. Chem. Eng.. Publicado em: 13/01/2020
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3. Production and Characterization of a Silica-Alumina Membrane Using Novel Tubular Freeze-Cast Substrates
Development of new ceramic membranes has recently grown due to its superior thermal and mechanical stability. An interesting approach to manufacture asymmetric membranes is the production of aligned pore structure by the freeze-casting method. The lack of studies involving membrane production with tubular freeze-cast substrates warrants more research. In thi
Mat. Res.. Publicado em: 11/02/2019
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4. Anti-inflammatory and antioxidant activities of the Impatiens noli-tangere and Stachys officinalis polyphenolic-rich extracts
ABSTRACT This study evaluated the anti-inflammatory and antioxidant activities of Impatiens noli-tangere L., Balsaminaceae, and of Stachys officinalis L., Lamiaceae, polyphenolic-rich extracts obtained by nanofiltration process. Results showed the great potential and efficiency of the nanofiltration process to concentrate the herbal extract's main polyphenol
Rev. bras. farmacogn.. Publicado em: 2018-01
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5. NANOFILTRATION AND REVERSE OSMOSIS APPLIED TO GOLD MINING EFFLUENT TREATMENT AND REUSE
Abstract Gold mining and ore processing are activities of great economic importance. However, they are related to generation of extremely polluted effluents containing high concentrations of heavy metals and low pH. This study aims to evaluate the optimal conditions for gold mining effluent treatment by crossflow membrane filtration regarding the following v
Braz. J. Chem. Eng.. Publicado em: 2017-01
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6. REUSE OF DAIRY WASTEWATER TREATED BY MEMBRANE BIOREACTOR AND NANOFILTRATION: TECHNICAL AND ECONOMIC FEASIBILITY
Abstract This study evaluated the technical and economic feasibility of membrane bioreactors (MBR) followed by nanofiltration (NF) for dairy wastewater treatment in order to reuse the treated effluent. It was observed that the MBR efficiently removed the organic matter and color of the feed effluent; however, due to the high concentration of dissolved solids
Braz. J. Chem. Eng.. Publicado em: 2015-09
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7. Nanofiltration: ion exchange system for effective surfactant removal from water solutions
A system combining nanofiltration and ion exchange for highly effective separation of anionic surfactant from water solutions was proposed. The subjects of the study were nanofiltration polyethersulfone membranes and ion-exchange resins differing in type and structure. The quality of the treated solution was affected by numerous parameters, such as quality o
Braz. J. Chem. Eng.. Publicado em: 2014-12
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8. Organic-inorganic hybrid membranes in separation processes: a 10-year review
In relation to some inorganic membranes, polymeric membranes have relatively low separation performance. However, the processing flexibility and low cost of polymers still make them highly attractive for many industrial separation applications. Polymer-inorganic hybrid membranes constitute an emerging research field and have been recently developed to improv
Braz. J. Chem. Eng.. Publicado em: 2013-12
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9. Stability of a nanofiltration membrane after contact with a low-level liquid radioactive waste
This study investigated the treatment of a liquid radioactive waste containing uranium (235U + 238U) using nanofiltration membranes. The membranes were immersed in the waste for 24-5000 h, and their transport properties were evaluated before and after the immersion. Surface of the membranes changed after immersion in the waste. The SW5000 h specimen lost its
Quím. Nova. Publicado em: 2013
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10. Concentração de extratos de pequi (Caryocar brasiliense Camb.) por nanofiltração / Concentration of pequi (Caryocar brasiliense Camb.) extract by nanofiltration
O pequi (Caryocar brasiliense Camb.) é uma fruta do cerrado de grande importância econômica, que apresenta alto teor de compostos fenólicos e carotenóides e alta atividade antioxidante. Este trabalho teve como objetivo desenvolver produtos ricos em compostos funcionais, principalmente compostos fenólicos e carotenóides, a partir de extratos aquosos e
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/08/2011
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11. Concentração da vinhaça por microfiltração seguida de nanofiltração / Vinasse concentration by microfiltration followed by nanofiltration
A aplicação de vinhaça na lavoura, como fertirrigação, é prática adotada e muito difundida entre as destilarias brasileiras, existindo inúmeros estudos que comprovam os resultados positivos na produtividade agrícola. Mas devido à normativa CETESB P4.231 o setor sucroalcooleiro se prepara para transportar a vinhaça para distâncias maiores e uma da
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/04/2011
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12. Remoção de metais pesados de efluentes sintéticos aquosos por nanofiltração / Heavy metal removal from aqueous synthetic wastewater by nanofiltration
O objetivo deste trabalho foi estudar a remoção de metais pesados de efluentes sintéticos aquosos através de nanofiltração, com utilização de membrana de poliamida. A membrana utilizada constituída de poliamida apresentou uma boa permeabilidade hidráulica, constatada pela linearidade de fluxo com a variação de pressão de trabalho. Os metais estu
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/03/2011