Mixing Estimation of a Laboratory-Scale External-loop Air-lift Bioreactor for Fungal Culture Using pH Tracer Method

2003 ◽  
Author(s):  
BINGJUN HE ◽  
WEI WEN SU
Keyword(s):  
Laboratory Scale ◽  
Fungal Culture ◽  
Tracer Method ◽  
External Loop ◽  
Air Lift

Gas holdup in an external-loop air-lift fermentor with a contaminated gas distributor

1985 ◽  
Vol 27 (7) ◽  
pp. 1092-1094 ◽  
Author(s):  
W. J. McManamey ◽  
D. A. J. Wase ◽  
S. Raymahasay
Keyword(s):  
Gas Holdup ◽  
External Loop ◽  
Gas Distributor ◽  
Air Lift

Steroid transformation in a laboratory-scale glass air-lift fermenter

1992 ◽  
Vol 8 (4) ◽  
pp. 399-401 ◽  
Author(s):  
P. K. Roy ◽  
A. W. Khan ◽  
J. Kumar ◽  
S. D. K. Chopra ◽  
S. K. Basu
Keyword(s):  
Laboratory Scale ◽  
Steroid Transformation ◽  
Air Lift

scholarly journals PENGARUH VISKOSITAS DAN LAJU ALIR TERHADAP HIDRODINAMIKA DAN PERPINDAHAN MASSA DALAM PROSES PRODUKSI ASAM SITRAT DENGAN BIOREAKTOR AIR-LIFT DAN KAPANG Aspergilus Niger

REAKTOR ◽  
2011 ◽  
Vol 13 (3) ◽  
pp. 194
Author(s):  
Kristinah Haryani ◽  
Widayat Widayat
Keyword(s):  
Mass Transfer ◽  
Citric Acid ◽  
Aspergillus Niger ◽  
Basic Material ◽  
Fluid Circulation ◽  
External Loop ◽  
Speed Flow ◽  
Air Speed ◽  
Air Lift ◽  
Aspergilus Niger

 EFFECT OF VISCOSITY AND FLOW RATE ON THE HYDRODYNAMICS AND MASS TRANSFER ON CITRIC ACID PRODUCTION USING Aspergilus Niger YEAST IN AN AIR-LIFT BIOREACTOR. Citric acid is an important organic acid that has many advantages used in foods, drinks, pharmaceuticals industries. Waste of pine apple (covers and core of the fruit) still have high contents of glucose and sucrose components, that these are potentially used as basic material for making citric acid by means of fermentation using Aspergillus niger. The reactor to do so is a reactor air-lift external loop with 88 cm in height, 45.41 cm2 in riser area, and 2.01 cm2 in downcomer area. This research is intended to study the influence of volumetric flow and viscosity upon mass transfer in the fermentation process of citric. The variable factors are concentration of total sugar (5 to 25%) and of volumetric flow of gas 9.4 to 23.3 cc/second. A dynamic method used to measure of the constants transfer  of gas-fluid mass where oxygen concentration soluted is measured every 30 second using DO meter device. Result of this research shows that the increase of viscosity causes the decrease of hold up gas and fluid circulation speed of the fluid, and the decrease of the constants of mass transfer. The increase of air speed flow will cause the increase of hold up gas and fluid circulation speed, and constants of mass transfer. Relation of the constraints of mass transfer to volumetric flow and viscosity is formulated as follow    Asam sitrat adalah asam organik penting yang sangat banyak kegunaannya seperti untuk industri makanan, minuman, farmasi, dan sebagainya. Limbah nanas (kulit dan bonggol) masih mengandung kadar glukosa dan sukrosa yang cukup tinggi, sehingga sangat potensial sebagai bahan baku pembuatan asam sitrat dengan cara fermentasi bantuan kapang Aspergillus niger. Reaktor yang digunakan adalah reactor air-lift external loop. Reaktor yang digunakan berdimensi tinggi 88 cm, luas daerah riser 46,41 cm2, dan luas daerah downcomer 2,01 cm2. Penelitian ini mempelajari pengaruh laju alir dan viskositas terhadap proses perpindahan massa dalam proses fermentasi asam sitrat. Variabel berubah adalah konsentrasi gula total (5-25%) dan laju alir gas 9,4-23,3 cc/detik. Metode untuk pengukuran konstanta perpindahan massa gas-cair dengan metode dinamik, dimana konsentrasi oksigen terlarut diukur tiap 30 detik menggunakan alat DO meter. Hasil penelitian menunjukkan bahwa kenaikan viskositas mengakibatkan penurunan hold up gas dan laju sirkulasi cairan, juga penurunan konstanta perpindahan massa. Kenaikan laju alir udara akan mengakibatkan kenaikan hold up gas, laju sirkulasi cairan, konstanta perpindahan massa. Hubungan konstanta perpindahan massa terhadap laju alir dan viskositas diperoleh persamaan

Correlation for Prediction of Minimum Fluidization Velocity and Riser Liquid Holdup in Three-Phase External Loop Air Lift Fluidized Bed Reactor

2010 ◽  
Vol 8 (1) ◽  
Author(s):  
Sivakumar Venkatachalam ◽  
Kannan Kandasamy ◽  
Senthilkumar Kandasamy
Keyword(s):  
Fluidized Bed ◽  
Fluidized Bed Reactor ◽  
Solid Particles ◽  
Liquid Holdup ◽  
Minimum Fluidization Velocity ◽  
Fluidization Velocity ◽  
External Loop ◽  
Minimum Fluidization ◽  
Newtonian Liquids ◽  
Air Lift

The effect of superficial gas and liquid velocities and properties of solids on the minimum fluidization velocity and riser liquid holdup of a three-phase external loop air lift fluidized bed reactor was characterized using Newtonian and non-Newtonian systems. Water, 65% and 85% of glycerol and n-Butanol were used as Newtonian liquids and different concentrations of carboxymethyl cellulose (i.e. 0.2%, 0.5% and 1% CMC) were used as non-Newtonian liquids. Spherical glass beads, bearl saddles and rasching rings of different sizes were used as solid phases. The phase flow rates and properties of solid particles had significant effects on the hydrodynamic characteristics of the external loop air lift fluidized bed reactor, such as minimum fluidization velocity and riser liquid holdup. Unified correlations have been developed to estimate the minimum fluidization velocity and riser liquid holdup as a function of superficial phase velocities, properties of solid particles and physical properties of both Newtonian and non-Newtonian liquid systems. The predicting ability of the correlations were tested with the experimental data and found to be a good fit with an absolute average relative deviation (AARD) of ± 6.5 % and ± 7.8 % for minimum fluidization velocity and riser liquid holdup, respectively.

scholarly journals Simulation of the rising of gas bubbles in a pilot-scale external loop airlift photobioreactor

2019 ◽  
Vol 113 ◽  
pp. 03023 ◽  
Author(s):  
Patrizia Bagnerini ◽  
Matteo Neviani ◽  
Ombretta Paladino
Keyword(s):  
Level Set Method ◽  
Level Set ◽  
Flue Gas ◽  
Gas Bubbles ◽  
Vertical Axis ◽  
Pilot Scale ◽  
Rectangular Domain ◽  
Good Correspondence ◽  
External Loop ◽  
Air Lift

Air-lift reactors offer an interesting option as a microalgae cultivation system, especially for biorefineries. To optimize this application, a precise description of the moving interfaces formed by the liquid and gas phase is critical. In this paper, a coupled Level Set Method (LSM) and finite difference method is used to simulate gas bubbles dynamics in a pilot-scale external loop air-lift photobioreactor in which microalgae are used to capture CO2 from flue gas and to treat wastewater. Numerical simulations are carried out on a rectangular domain representing the section on the vertical axis of the riser. The data employed were either acquired from previous experimental campaigns carried out in the ALR or found in the literature. The rise, shape dynamics and coalescence process of the bubbles of flue gas are studied. The issue of volume loss characteristic of standard LSM is dealt with the conservative level set method. Computation results show good correspondence with the experimental ones.

Hydrodynamic studies in sectionalised external loop air lift reactors

2019 ◽  
pp. 1-16
Author(s):  
Shivanand M. Teli ◽  
Channamallikarjun Mathpati
Keyword(s):  
External Loop ◽  
Air Lift
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