Suppose that we have available a bacterium that grows in accordance with the Mon

Question

Suppose that we have available a bacterium that grows in accordance with the Monod model with a very small death rate, and a saturation constant of 0.2 g/l.    The bacteria are in an ideal chemostat of volume 10 liters that will be operated at steady state.   The feed flow rate is 4 liters/hr, the substrate concentration in the feed stream to the reactor is 2.0 g/l, the substrate concentration in the product stream is 0.1 g/l. The reactor cell productivity is 0.5 grams of cell per liter per hour.

What is the value of the cell yield (Equation 6.11)?

What is the minimum doubling time for the bacteria?

Suppose we wish to increase the concentration of cells in the product stream leaving the reactor by 2%, holding substrate concentration in the feed constant. What should be the new feed flow rate to the reactor?

Please help.

Explanation / Answer

The minimum doubling time of bacterium is 15minutes.

New feed flow rate to the reactor after the increase concentration of cells in the product stream is 5 Minutes

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