Removal Of Chromium
Mostrando 25-36 de 48 artigos, teses e dissertações.
-
25. Retenção de grampos cirucenferenciais associados a retentores intra-radiculares com encaixe era utilizados em overdentures parciais removíveis / Retention clips cirucenferenciais associated with CuAlZn with docking was used in removable partial overdentures
The overdentures can be defined as total or partial removable dentures that cover root or osseo integrated implants rehabilitating the whole dentition. The mechanical retention in the removable partial overdentures (RPOs) is obtained through the use of cast clasps and attachments. This biomechanical principle has a great importance, since is inwardly associa
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/07/2008
-
26. Preparation and application of activated carbon and iron oxide prepared from PVA coffee defect in the removal of pollutants in aqueous medium / PreparaÃÃo e aplicaÃÃo de compÃsitos de carvÃo ativado e Ãxido de ferro preparados a partir do defeito PVA do cafà na remoÃÃo de poluentes do meio aquoso.
The black, green and sour (PVA) coffee defect contribute with ca. 20% of the total coffee production. It should be separate from the normal coffee grains in order to improve the final quality of the beverage. In this way, the present work has the objective to use this reject for the production of adsorbents and materials with catalytic properties for using i
Publicado em: 2008
-
27. CORROSION OF ADVANCED STAINLESS STEEL IN PHYSIOLOGICAL SOLUTIONS / Corrosão de aços inoxidáveis avançados em meios fisiológicos
The main objective of this study was to determine the corrosion behavior of advanced stainless steels (SS) in physiological solutions to evaluate their potential for use as biomaterials. Four stainless steels were tested: a superferritic stainless steel (DIN W. Nr. 1.4575), Incoloy MA 956, containing aluminum and yttrium oxide, an austenitic stainless steel
Publicado em: 2008
-
28. Abordagem multiobjetivo na seleção de sistemas de reúso de água em irrigação paisagística no Distrito Federal
This thesis describes the effects on the system water-soil-plant caused by the use of effluents for irrigation of plots of flowers in the Federal District. Also, from the perspective of Multicriteria Analysis, this work describes and applies a methodology for selection of systems for water reuse in irrigation, using data from a pilot study conducted previous
Publicado em: 2008
-
29. Treatment of the chromium-containing solid wastes from leather industry: use in adsorption process and as nitrogen source in agriculture. / Tratamento de rejeitos sÃlidos contendo cromo da indÃstria de couro: uso em processos de adsorÃÃo e como fonte de nitrogÃnio na agricultura.
The leather industry has a great economic importance for Brazil, however it is responsible for the generation of solid wastes containing chromium (sawdust and stripes of wet blue leather), which need suitable disposal for being classified as class 1 waste. The objectives of this work were to treat this waste for chromium removal and to use the resultant mate
Publicado em: 2007
-
30. REMOÇÃO DE PB, CR E CU POR PROCESSO COMBINADO DE BIOSSORÇÃO/BIOFLOTAÇÃO UTILIZANDO A CEPA RHODOCOCCUS OPACUS / REMOVAL OF PB, CR AND CU BY A COMBINED BIOSORPTION / BIOFLOTATION PROCESS USING A RHODOCOCCUS OPACUS STRAINT
This work evaluated the potential of the Rhodococcus opacus strain as a biosorbent for the removal of Pb(II), Cr(III) and Cu(II) from aqueous solutions by Biosorption/bioflotation process, through experimental batch tests. The operational parameters investigated in the biosorption´s stage were: pH of the solution, biomass concentration, contact time and ini
Publicado em: 2007
-
31. AvaliaÃÃo dos impactos ambientais gerados pela produÃÃo de resÃduos industriais do ramo metalÃrgico : recuperaÃÃo e reciclagem
Galvanization is an industrial process used to protect metallic materials surface, in order to extend their durability however, this process generated metallic residues. With the objective to decrease the environment impact from these residues this work considers the development of a methodology to remove metals as Iron, Zinc and Chromium. Initially an facto
Publicado em: 2007
-
32. The process of biosorption of heavy metals in bioreactors loaded with sanitary sewage sludge
This work on the process of biosorption of nickel and chromium in an ascendant continuous-flow, fixed packed-bed bioreactor of sanitary sewage sludge was conducted in a search for solutions to the environmental problem caused by heavy metals. Analysis of the results demonstrated that the absorbent had an extraordinary capacity for biosorption of the heavy me
Brazilian Journal of Chemical Engineering. Publicado em: 2006-06
-
33. Studies of removal of chromium by model constructed wetland
Chromium is a pollutant present in tannery wastewater, its removal is necessary for protection of the environment. Penisetum purpureum, Brancharia decumbens and Phragmites australis were grown hydroponically in experimental gravel beds to determine their potential for the phytoremediation of solutions containing 10 and 20 mg Cr dm-3. These concentrations, si
Brazilian Journal of Chemical Engineering. Publicado em: 2005-09
-
34. Resíduos sólidos de curtumes como adsorventes para a remoção de corantes em meio aquoso
The tanning process in the leather industry generates very high quantities of chromium-containing solid waste ("wet blue" leather). Environmental concerns and escalating landfill-costs are becoming increasingly serious problems for the leather industry and an alternative disposal is needed. In this work, we are presenting a novel application for this solid w
Química Nova. Publicado em: 2005-06
-
35. BIOSSORPTION OF HEAVY METALS ON GREEN COCONUT POWDER / BIOSSORÇÃO DE METAIS PESADOS UTILIZANDO PÓ DA CASCA DE COCO VERDE (COCOS NUCIFERA)
Heavy metal pollution has become one of the most serious problems today, and the use of organic material biomass for the detoxification of industrial effluents for environmental protection offers a potential alternative to existing trea tment technologies. The aim of this work was determined the biosorption capacity of coconut fibers (Cocos nucifera) for dif
Publicado em: 2005
-
36. Estudo da extração de cromo hexavalente, pela técnica de membranas líquidas surfatantes, visando o tratamento de efluentes líquidos de curtumes
In the present work, it has been proposed to study the extraction of dichromate ions from an external phase (formed by potassium dichromate solution), using the surfactant liquid membrane technique (S.L.M). The main goal of this work is to reduce these species content in tanneries effluents. The following operational variables has been investigated: extracta
Publicado em: 2005