Bubble Column Reactor
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. CARBON DIOXIDE BIOFIXATION BY Chlorella sp. IN A BUBBLE COLUMN REACTOR AT DIFFERENT FLOW RATES AND CO2 CONCENTRATIONS
Abstract CO2 biofixation of the microalgae Chlorella sp. for different CO2 concentrations and gas flow rates in a bubble column reactor has been investigated in this study. Microalgae were cultivated under different CO2 concentrations (at 1.75% and 9.45% v/v) and gas flow rates (at 30, 50 and 70 ml/min). The maximum specific growth rate of Chlorella sp. was
Braz. J. Chem. Eng.. Publicado em: 30/09/2019
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2. Removal of entrained organic matter in the copper electrolyte by ozonation
Abstract Organic matter-in-aqueous entrainment is a serious problem in the hydrometallurgical extraction of copper from ore. Current inefficiencies, changes in the morphology and orientation of cathode deposit are some of the problems when organic matter is present in the advance electrolyte. In addition, negative effects upon metabolic activity of bioleachi
REM, Int. Eng. J.. Publicado em: 2019-03
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3. Mass transfer of SO2 absorption with an instantaneous chemical reaction in a bubble column
Gas absorption accompanied by an instantaneous irreversible chemical reaction in bubble columns has been analyzed theoretically. A mass transfer model based on the Dankwerts surface-renewal model as well as the penetration theory for surface stretch proposed by Angelo et al. was developed, in which the effects of bulk motion and turbulence on mass transfer w
Braz. J. Chem. Eng.. Publicado em: 2013-09
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4. Hydrodynamics and oxygen mass transfer characteristics of petroleum based micro-emulsions in a packed bed split-cylinder airlift reactor
The effects of aeration velocity and liquid properties on the pertinent hydrodynamic and mass transfer parameters in a split-cylinder airlift reactor (with and without packing) were examined. Four different oil-in-water micro-emulsion systems containing kerosene, heavy naphtha, light naphtha and diesel as the oil at the concentration of 7% (v/v) were used in
Braz. J. Chem. Eng.. Publicado em: 2013-09
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5. Yeast biomass production: a new approach in glucose-limited feeding strategy
The aim of this work was to implement experimentally a simple glucose-limited feeding strategy for yeast biomass production in a bubble column reactor based on a spreadsheet simulator suitable for industrial application. In biomass production process using Saccharomyces cerevisiae strains, one of the constraints is the strong tendency of these species to met
Braz. J. Microbiol.. Publicado em: 2013
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6. Aeration effect on Spirulina platensis growth and γ-linolenic acid production
The influence of aeration on algal growth and gamma-linolenic acid (GLA) production in a bubble column photobioreactor was investigated. Studies were performed in a 20-L reactor at different aeration rates (0.2-2.5 vvm). Static, continuous, and periodic operation of air resulted in 41.9%, 88.4%, and 108% air saturation of dissolved oxygen, for which the corr
Brazilian Journal of Microbiology. Publicado em: 2012-03
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7. Characterization of gas-liquid parameters in a down-flow jet loop bubble column
In order to characterize the gas-liquid parameters of a down-flow jet loop reactor, experiments were carried out to study the gas holdup, bubble sizes and their distribution, mass transfer area and mass transfer coefficient. The experiments were performed in the bubbly flow regime because of its stability and uniformity. Analysis of experimental data showed
Brazilian Journal of Chemical Engineering. Publicado em: 2010-06
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8. Degradação do Ácido Diclorofenoxiacético (2,4-D) com ozônio eletrogerado
Electrochemically generated ozone was applied on degradation of the herbicide 2,4- dichlorophenoxyacetic acid (2,4-D), in acid and alkaline solutions, under semi-batch condition using a column bubble reactor. Oxidation of 2,4-D was studied using different experimental approaches in order to assess the oxidative process (degradation and partial mineralization
Publicado em: 2010
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9. Produção de goma xantana em reator de coluna de bolha utilizando processo de batelada repetida / Xanthan gum production in a buble column reactor using a repeated bath process
The aim of this work is to evaluate xanthan production in a bubble column reactor using a repeated batch process as well as to optimize de gum production operational conditions and evaluate some of the typical steps of the recovery process. Two Xanthomonas campestris strains were evaluated: ATCC 13951 (or NRRL B-1459) and ATCC 55298. The cycles were comprise
Publicado em: 2008
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10. Estudo da produção do antibiótico antitumoral retamicina em biorreatores com células imobilizadas de Streptomyces olindensis ICB20. / Production of the antitumor antibiotic retamycin by immobilized cells of Streptomyces olindensis ICB20 in bioreactors.
The purpose of this study was to investigate the production of the antitumor antibiotic retamycin by immobilized cells of Streptomyces. olindensis ICB20 in bioreactors. Cells were immobilized by entrapment in Ca-alginate gel (3%) after being grown in Erlenmeyers (reactivation and pre-immobilization cultures). The average diameter of the Ca-alginate beads was
Publicado em: 2007
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11. Degradation of the Herbicida Atrazina saw Processes Advanced of Oxidation / DegradaÃÃo do Herbicida Atrazina via Processos AvanÃados de OxidaÃÃo
Herbicide contamination of the aquatic environment is widespread, particularly that caused by the triazine group herbicide Atrazine, which is used for weed-control in sugar-cane crops in the State of Pernambuco in Brazil. Atrazine is a âpriority pollutantâ since it is carcinogenic and is highly resistant to biological breakdown, with a 12 months half-life
Publicado em: 2004
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12. Introdução a modelagem em 3D para reatores air-lift empregando o "metodo dos volumes finitos" na resolução da fluidodinamica (CFD)
O objetivo deste trabalho foi um estudo das metodologias Euler-Euler e Euler- Lagrange e a conseqüente modelagem da fluidodinâmica dos Reatores Air-Lift em conjunção com a resolução numérica das equações resultantes. Pesquisou-se a aplicação da Computational Fluid Dynamics-CFD nos campos da Engenharia Química dando ênfase aos escoamentos multif�
Publicado em: 2003