Bioreactors are vessels of large volumes
(100-1000 L) in which raw materials are biologically converted into specific
The most commonly used bioreactors are
of stirring type, which are shown in figure.
A stirred-tank reactor is usually
cylindrical or with a curved base to facilitate the mixing of there actor
contents. The stirrer facilitates even mixing and oxygen availability
throughout the bioreactor. Alternatively air can be bubbled through the
If you look at the figure closely
you will see that the bioreactor has an agitator system, anoxygen delivery
system and a form control system, a temperature control system, pH control system
and sampling ports so, that small volumes of the culture can be withdrawn periodically.
Small volume cultures are usually
employed in laboratories in a flask for research and production of
lessquantities of products. However, large scale production of the products is carried
out in bioreactors.
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