Biodegradation of lipids from olive oil mill wastewaters in a stationary basket bioreactor with immobilized Bacillus spp. cells – Influence of internal diffusion

2012 ◽  
Vol 65 (5) ◽  
pp. 920-926 ◽  
Author(s):  
Dan Caşcaval ◽  
Anca-Irina Galaction ◽  
Marius Turnea ◽  
Anca Marcela Lupăşteanu
Keyword(s):  
Internal Diffusion ◽  
Bacterial Cells ◽  
Internal Mass ◽  
Biodegradation Process ◽  
Lipid Mass ◽  
Bacillus Spp ◽  
Liquid Boundary ◽  
Mass Flows ◽  
Mass Transfers ◽  
Liquid Boundary Layer

The study is focused on the external and internal mass transfers of lipids during their biodegradation process in a bioreactor with stationary basket bed of immobilized Bacillus spp. cells. By means of the lipid mass balance for a single particle of biocatalyst, considering the kinetic model adapted for the immobilized bacterial cells, specific mathematical models have been developed to estimate their mass flows in the liquid boundary layer surrounding the particle and inside the particle. The values of mass flows are significantly influenced by the internal diffusion velocity of lipids and the rate of their consumption, but also by the position inside the basket bed. These influences accumulated led to the appearance of a biological inactive region near the particle centre, its magnitude varying from 1.3 to 49.4% of the overall volume of particles.

External and internal diffusion of lipids in biodegradation process with stirred beds of immobilized Bacillus spp. cells

2012 ◽  
Vol 29 ◽  
pp. S111-S112
Author(s):  
Larisa Rumelea ◽  
Anca Marcela Lupasteanu ◽  
Marius Turnea ◽  
Lenuta Kloetzer ◽  
Anca-Irina Galaction ◽  
...  
Keyword(s):  
Internal Diffusion ◽  
Biodegradation Process ◽  
Bacillus Spp

Glucose Mass Transfer Under Substrate Inhibition Conditions in a Stationary Basket Bioreactor with Immobilized Yeast Cells

2012 ◽  
Vol 10 (1) ◽  
pp. 1-13 ◽  
Author(s):  
Anca Irina Galaction ◽  
Roxana Rotaru ◽  
Dan Cascaval
Keyword(s):  
Mass Transfer ◽  
Substrate Inhibition ◽  
Inhibitory Effect ◽  
Yeast Cells ◽  
Glucose Inhibition ◽  
Unitary Approach ◽  
Liquid Boundary ◽  
Immobilized Yeast Cells ◽  
Mass Flows ◽  
Mass Transfers

The work is dedicated to the study on the external and internal mass transfers of glucose for alcoholic fermentation under glucose inhibition limitation using a bioreactor with stationary basket beds of immobilized Saccharomyces cerevisiae cells. By means of the substrate mass balance for a single particle of biocatalysts, considering the kinetic model adapted for the inhibitory effect of glucose, specific mathematical models have been developed for describing the profiles of the substrate concentration in the outer and inner regions of biocatalysts and, implicitly, for estimating its mass flows in the liquid boundary layer surrounding the particle and inside the particle. The values of the mass flows are significantly influenced by the internal diffusion velocity of substrate and rate of the biochemical reaction of substrate consumption, but also by the position inside the basket bed. These influences cumulated led to the appearance of biological inactive region near the particle centre, its magnitude varying from 0.34 to 31% from the overall volume of particles. The presented results are the first unitary approach of the aspects of substrate mass transfer in a basket bed of immobilized biocatalysts, the proposed models being original and complex.

Raman Spectrum Analysis on the Solid–Liquid Boundary Layer of BGO Crystal Growth

2007 ◽  
Vol 24 (7) ◽  
pp. 1898-1900 ◽  
Author(s):  
Zhang Xia ◽  
Yin Shao-Tang ◽  
Wan Song-Ming ◽  
You Jing-Lin ◽  
Chen Hui ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Raman Spectrum ◽  
Crystal Growth ◽  
Spectrum Analysis ◽  
Liquid Boundary ◽  
Solid Liquid ◽  
Liquid Boundary Layer

scholarly journals Intrinsic kinetic study of 1-butene isomerization over magnesium oxide catalyst via a Berty stationary catalyst basket reactor

RSC Advances ◽  
2020 ◽  
Vol 10 (60) ◽  
pp. 36667-36677
Author(s):  
Khunnawat Ountaksinkul ◽  
Sippakorn Wannakao ◽  
Piyasan Praserthdam ◽  
Suttichai Assabumrungrat
Keyword(s):  
Magnesium Oxide ◽  
Oxide Catalyst ◽  
Internal Mass ◽  
Intrinsic Kinetics ◽  
Recycle Reactor ◽  
Mass Transfers ◽  
Intrinsic Kinetic ◽  
Kinetics Of ◽  
Stationary Catalyst ◽  
Butene Isomerization

The intrinsic kinetics of 1-butene isomerization over a commercial MgO catalyst was studied by using a Berty-type reactor (gradient-less recycle reactor) without limitations of heat-, external mass-, and internal mass-transfers.

Kinetic Studies of Adsorption-Desorption of Cd and Zn Onto Al2O3/Solution Interfaces

1993 ◽  
Vol 28 (7) ◽  
pp. 39-45 ◽  
Author(s):  
K. S. L. Lo ◽  
J. O. Leckie
Keyword(s):  
Mass Transfer ◽  
Mass Transport ◽  
Metal Ion ◽  
Internal Diffusion ◽  
Internal Mass ◽  
Transfer Coefficients ◽  
Mass Transfer Coefficients ◽  
Near Surface ◽  
Film Diffusion ◽  
Slow Stage

The effects of external and internal mass transport limitations on zinc and cadmium adsorption onto the porous amorphous aluminium oxide/solution interfaces were studied. A modified two-stage rate model was used to interpret the experimental results. The rapid stage results from external surface film diffusion and internal diffusion into the near surface pores. The slow stage results from internal mass transport and extends over several days. The mass transfer-adsorption coefficients of the rapid stage are almost two orders of magnitude larger than those of the slow stage. The external mass transfer coefficients show an increasing trend with increasing pH, and appear to be affected by the charge/potential condition of the oxide/solution interface. The internal mass transfer coefficients indicate a uniform trend for both the zinc and cadmium results. The desorption rates and final metal ion solution concentrations are affected by the bulk solution pH. Film diffusion and internal diffusion are affected by the higher relative ratio of metal ion concentration to adsorbent concentration.

Visualization of Microbubble Distribution Inside Turbulent Boundary Layer Along Flat and Curved Solid Surfaces

2019 ◽  
Author(s):  
Yuichi Murai ◽  
Daichi Saito ◽  
Daiki Ushiyama ◽  
Hyun Jin Park ◽  
Yuji Tasaka
Keyword(s):  
Boundary Layer ◽  
Solid Wall ◽  
Three Dimensional ◽  
Elliptic Cylinder ◽  
Water Electrolysis ◽  
Solid Surfaces ◽  
Curvature Radius ◽  
Liquid Boundary ◽  
Dimensional Distribution ◽  
Liquid Boundary Layer

Abstract How microbubbles behave inside turbulent boundary layers are investigated experimentally. Water electrolysis is applied for generation of microbubbles in water, of which electrodes are flash mounted on the solid wall in the upstream section of the measurement area. Four kinds of solid surfaces are examined to compare the microbubble distribution. For a circular cylinder of the radius R = 22 mm at Re = 5,000, we found that microbubbles depart from the surface earlier than the liquid boundary layer. For an elliptic cylinder of the curvature radius of R = 60 mm and a hydrofoil of NACA0040, microbubble injection made the separation point move downstream in the range of 9,000 < Re < 90,000. To compare the effect with the cases of flat solid surfaces (R = infinity), we visualized three-dimensional distribution of microbubbles with color-coded volumetric illumination technique. The result has shown formation of microbubble clusters intermittently, which has Coulomb potential due to negative electric charge on bubble interfaces.

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