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Prediction of gas holdup in the three-phase fluidized bed: air/Newtonian and non-Newtonian liquid systems

100%
Sivakumar V., Senthilkumar K., Kannadasan T.
Polish Journal of Chemical Technology
|
2010
|
vol. 12
|
issue 4
64-71
EN
The application of the three-phase fluidization technology in wastewater treatment and other biochemical processes has been regularly addressed in the past decades. For the design and development of the three-phase fluidized bed reactors, knowledge of the hydrodynamic parameter such as gas holdup is essential and hence in this paper an attempt has been made to study the effect of fundamental and operating variables on gas holdup. On the basis of the experimental results, a unified correlation has been developed to predict gas holdup in the fluidized bed using the Newtonian and the non-Newtonian liquids. The experimental results showed good agreement with those predicted according to the developed correlation.
2
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Continuous mathematical models of airlift bioreactors: Families, affinity, diversity and modelling for single-substrate kinetics

100%
Grzywacz R.
Chemical and Process Engineering
|
2012
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vol. 33
|
issue 2
291-309
EN
This paper presents a method of describing an airlift bioreactor, in which biodegradation of a carbonaceous substrate described by single-substrate kinetics takes place. Eight mathematical models based on the assumption of liquid plug flow and axial dispersion flow through the riser and the downcomer in the reactor were proposed. Additionally, the impact of degassing zone with assumed complete mixing on the obtained results was analyzed. Calculations were performed for two representative hydrodynamic regimes of reactor operation, i.e. with the presence of gas bubbles only within the riser and for complete gas circulation. The conclusions related to the apparatus design and process performance under sufficient aeration of the reaction mixture were drawn on the basis of the obtained results.
3
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Continuous mathematical models of airlift bioreactors: Families, affinity, diversity and modelling for single-substrate kinetics

86%
Grzywacz R.
Chemical and Process Engineering
|
2012
|
issue 2
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