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The continuous stirred-tank reactor (CSTR), also known as vat-or backmix reactor, mixed flow reactor (MFR), or a continuous-flow stirred-tank reactor (CFSTR), is a common model for a chemical reactor in chemical engineering and environmental engineering. A CSTR often refers to a model used to estimate the key unit operation variables when using ...
General structure of a continuous stirred-tank type bioreactor. On the basis of mode of operation, a bioreactor may be classified as batch, fed batch or continuous (e.g. a continuous stirred-tank reactor model). An example of a continuous bioreactor is the chemostat. [citation needed]
A scale-down bioreactor is a miniature model designed to mimic or reproduce large-scale bio-processes or specific process steps on a smaller scale. These models play an important role during process development stage by fine-tuning the minute parameters and steps without the need for substantial investments in both materials and consumables.
The most familiar form of continuous reactor of this type is the continuously stirred tank reactor (CSTR). This is essentially a batch reactor used in a continuous flow. The disadvantage with a single stage CSTR is that it can be relatively wasteful on product during start up and shutdown.
Stirred tank bioreactors are used for the biooxidation of gold. [16] While stirred tanks have been used to bioleach cobalt for copper mine tailings, [18] these are costly systems that can reach sizes of >1300m 3 meaning that they are almost exclusively used for very high value minerals like gold. [16] Illustration of the process of uranium heap ...
[1] [2] Microcarrier cell suspensions in stirred tank bioreactors allows for an even distribution through homogenous stirring. [1] Parameters such as pH, oxygen pressure, and media supplement concentrations can be continually monitored within a bioreactor as opposed to manually testing small samples from plates. [2]
A chemostat (from chemical environment is static) is a bioreactor to which fresh medium is continuously added, while culture liquid containing left over nutrients, metabolic end products and microorganisms is continuously removed at the same rate to keep the culture volume constant.
The most common utilized reactor type for syngas fermentation is the stirred-tank reactor in which the mass transfer is influenced by several factors such as geometry of the reactor, impeller configuration, the agitation speed and the gas flow rate.
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