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Consider the plots on the next page showing the substrate ( S ) , cell dry weight ( X ) , and secreted extracellular product
Consider the plots on the next page showing the substrate S cell dry weight X and
secreted extracellular product concentrations as a function of time during batch culture of
yeast which was inoculated at a concentration at The
information in these plots will be used to design a CSTR to produce P The feed medium and
operating conditions etc. will be the same as those used in the batch culture.
a If the outlet yeast concentration is to be maintained at determine the
reactor volume that would be required to process a feed flow rate,
b Determine the following parameters for the CSTR system:
i The product concentration, in the reactor outlet stream
ii The volumetric production rate of product
iiiThe specific product formation rate,
c Now consider the yields from substrate in the CSTR:
i Determine the apparent yield of product from substrate,
ii Determine the apparent yield of yeast from substrate, app
iiiConsider the individual theoretical maximum values for the yield of from
and the yield of from Briefly discuss whether you would
expect and to be slightly greater or substantially greater
than the respective apparent yields and you calculated in
part b Be sure to explain your reasoning.
Be sure to show including on the plot and clearly explain your work for all parts of the
problem.
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