Fermentation Reactors

In an activated sludge process, the biomass is recycled to

A:

increase the efficiency of the process

B:

reduce sludge volumes

C:

increase the concentration of cells

D:

all of the above

Answer: D

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In a plug flow reactor, the highest concentration of substrates is exposed to the cells that

A:

are near the effluent or exit of the reactor

B:

are in the mid way along the reactor

C:

are located near entrance of feed

D:

are near the wall of the reactor

Answer: C

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Which of the following is not correct with regards to continuous cultures?

A:

The major industrial scale application of continuous cultures is in waste water treatment

B:

Mutation and contamination present a major risk to the operation of continuous cultures for the production of metabolites

C:

The continuous cultures is very useful for the production of pharmaceuticals

D:

Continuous cultures have an advantage that they do not need to shut down as regularly as batch culture reactor

Answer: C

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In a glucose-yeast extract medium, Lactococcus lactis has a maximum specific growth rate (um) of 1.23 h^-1. What would be the specific growth rate of this organism at steady state in a 4 litre reactor being fed at 2 litres per hour?

A:

0.5 h^-1

B:

1.2 h^-1

C:

2.4 h^-1

D:

4 h^-1

Answer: A

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Saccharomyces cerevisiae produces high biomass yields at low glucose concentrations and high dissolved oxygen concentrations. Which of the following should be followed for maximizing its biomass productivity?

A:

Batch fermenter with a high initial glucose concentration

B:

Continuous fermenter with a low initial glucose concentration

C:

Fed batch fermenter

D:

All of the above

Answer: C

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Questions for: Fermentation Reactors