Removal Of Chromium
Mostrando 13-24 de 48 artigos, teses e dissertações.
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13. Remoção de cromo (VI) de soluções aquosas utilizando o compósito magnético calcinado hidrotalcita-óxido de ferro: estudo cinético e de equilíbrio termodinâmico
In this work, hydrotalcite, a layered double hydroxide, had its ion exchange properties combined with the magnetic properties of iron oxide to produce a magnetic adsorbent, HT-Fe 500. These magnetic composites can be used as adsorbents for anionic contaminants in water and subsequently removed from the medium by a simple magnetic process. Removal of chromium
Quím. Nova. Publicado em: 2013
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14. UTILIZAÇÃO DE ESCAMAS DO PEIXE CORVINA PARA ADSORÇÃO DE Cr(VI) EM MEIO AQUOSO CINÉTICA E TERMODINÂMICA POR CALORIMETRIA ISOTÉRMICA CONTÍNUA.
Adsorption has become a key process for the removal of very low amounts of undesirable components from waters and wastewaters and in the sense for being environmental friendly as well. This work has as aim the study of some properties of scales of Corvina fish (Micropogonias furnieiri) as a new adsorbent to remove Cr(VI) from aqueous solutions. The Corvina s
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/02/2011
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15. Evaluatin of metabisulfite and a commercial stee wool for removing chromium (VI) from wastewater.
Efficiency of metabisulfite and a commercial steel wool as reducing agents in the removal of Cr(VI) from wastewaters was evaluated. Chromium( VI) was converted to Cr(III), precipitated with NaOH, and removed by filtration. A reduction of more than 1.0 x 10(5) and 4.0 x 10(5) fold in total Cr and the Cr(VI) concentrations, respectively, was observed by employ
Enviromental Chemistry Letter. Publicado em: 2011
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16. Estudo da especiaÃÃo do cromo no processo de adsorÃÃo por carvÃo ativado usando a espectroscopia de emissÃo de raios X Kβ / Study of the chromium speciation during the adsorption process on activated carbon as assessed by X-ray Kβ emission spectroscopy
Este trabalho visa estudar a reduÃÃo do cromo hexavalente à forma trivalente atravÃs do processo de adsorÃÃo, avaliada pela espectrometria Kβ de emissÃo. Amostras de carvÃo ativado foram utilizados como material adsorvente, enquanto a resina Amberlite IR 120 foi usada como um indicador da presenÃa de Cr(III) em todas as soluÃÃes contendo Cr(V
Publicado em: 2011
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17. RemoÃÃo de Sulfato em Efluentes de Curtume usando Processo BiolÃgico / Sulfate removal in tannery wastewater using biological processes
A dissertaÃÃo teve como objetivo analisar a estabilidade e eficiÃncia do processo anaerÃbio de reduÃÃo de sulfato aplicado ao tratamento de efluente de um curtume. Utilizaram-se dois reatores anaerÃbios de manta de lodo e fluxo ascendente (UASB-Upflow Anaerobic Sludge Blanket), com capacidade de 3,0 litros, temperatura constante de 29+2ÂC e tempo de
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/08/2010
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18. REMOVAL OF CHROMIUM AND ZINC BY Aspergillus niger / RemoÃÃo de Cromo e Zinco por Aspergillus niger
Os microrganismos tÃm sido amplamente estudados para remoÃÃo de diversos contaminantes em Ãguas residuÃrias, dentre eles os metais pesados. Este estudo tem como abordagem principal a remoÃÃo de metais tÃxicos pelo fungo filamentoso Aspergillus niger isolado do efluente de uma indÃstria petroquÃmica. A pesquisa foi dividida em duas partes: a primeir
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 08/03/2010
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19. Comparative study of two commercially pure titanium casting methods
The interest in using titanium to fabricate removable partial denture (RPD) frameworks has increased, but there are few studies evaluating the effects of casting methods on clasp behavior. OBJECTIVE: This study compared the occurrence of porosities and the retentive force of commercially pure titanium (CP Ti) and cobalt-chromium (Co-Cr) removable partial den
Journal of Applied Oral Science. Publicado em: 2010-10
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20. Recovery and reuse of hexavalent chromium from aqueous solutions by a hybrid technique of electrodialysis and ion exchange
The chrome plating industry is one of the highly polluting industries whose effluent mainly consists of chromium(VI). This compound is highly toxic to aquatic life and human health. The rinse water constituents reflect the chrome plating bath characteristics; generally dead tank wash water contains about 1% of the plating bath concentration. Other metals and
Brazilian Journal of Chemical Engineering. Publicado em: 2010-03
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21. Adsorption of chromium ion (VI) by acid activated carbon
The activated carbon produced from olive stones was chemically activated using sulfuric acid, (OS-S), and utilized as an adsorbent for the removal of Cr(VI) from aqueous solution in the concentration range 4-50 mg/L. Adsorption experiments were carried out in a batch process and various experimental parameters such as effect of contact time, initial chromium
Brazilian Journal of Chemical Engineering. Publicado em: 2010-03
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22. Dynamic adsorption of chromium ions onto natural and crosslinked chitosan membranes for wastewater treatment
Water pollution with heavy metals is a matter of major concern for public health and also for natural resource management. The present study investigated the effect of chemical modifications on biopolymeric adsorbents (based on chitosan membranes) for chromium removal using fixed-bed dynamic adsorption technique. Parameters such as flow rate, initial concent
Materials Research. Publicado em: 2010-03
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23. Uso de Biofiltros para remoção de cromo (VI)
Este trabalho estudou a redução biológica de Cr (VI) e remoção de cromo total em filtro anaeróbio seguido por um biofiltro submerso com aeração intermitente, utilizando cultura mista de micro-organismos. Para o trabalho foram obtidas duas culturas mistas, uma do lodo da AMCOA (Associação dos Manufatores de Couros e Afins do Distrito Industrial de F
Publicado em: 2010
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24. Influence of luting agents on time required for cast post removal by ultrasound: an in vitro study
OBJECTIVE: This in vitro study evaluated the influence of luting agents on ultrasonic vibration time for intraradicular cast post removal. MATERIAL AND METHODS: After endodontic treatment, 30 roots of extracted human canines were embedded in resin cylinders. The post-holes were prepared at 10 mm depth and their impressions were taken using autopolymerizing a
Journal of Applied Oral Science. Publicado em: 2009-06