The growth of baker’s yeast (S. cerevisiae) on glucose may be simply described by the following equation:

In a batch reactor of volume 10^5 l, the final desired yeast concentration is 50 gdw/l. Using the above reaction stoichiometry. Determine the concentration and total amount of glucose in the nutrient medium?

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#Question id: 14289

#Section 5: Bioprocess Engineering and Process Biotechnology

In a fermenter the impeller diameter is increased from 0.5m to 1m and the rpm is increased from 100 rpm to 400 rpm. Reynolds number will increase by?

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#Question id: 14290

#Section 5: Bioprocess Engineering and Process Biotechnology

Acetobacter aceti converts alcohol to acetic acid according to the schiometric relation

In a vigorously agitated and aerated reactor containing 20 g/l ethanol, the organism produces 16g/l acetic acid and 2g/l was the residual ethanol concentration what are the theoretical and observed yields of acetic acid expressed in g/g ethanol

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#Question id: 14291

#Section 5: Bioprocess Engineering and Process Biotechnology

In a batch sterilization process if  overall,  heating &  cooling are 32.2, 9.8 & 10.1 respectively, THEN the holding time at 121^^o-C of the process is (given that the specific death rate (k) of microorganisms at 121^^o-C is 2.54 min-1 ):

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#Question id: 14292

#Section 5: Bioprocess Engineering and Process Biotechnology

Consider the scale up of a fermentation from a 10L to 10000L while maintaining geometric similarity. Agitation speed was maintained at 500 rpm in the 10L fermenter. If scale up is done based on constant tip speed, then the agitation speed in the larger reactor should be 

rpm. 

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#Question id: 14293

#Section 5: Bioprocess Engineering and Process Biotechnology

Scale up of a fermenter is done based on constant impeller tip speed. If the diameter of the impeller is increased by 10-fold, the agitator speed will: 

TLS Online TPP Program

#Question id: 14294

#Section 5: Bioprocess Engineering and Process Biotechnology

What will be the generation time of a culture with a specific growth rate constant of 0.01 min^-1?