Unit Test
1 answer:
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Answer:
Explanation:
Given that:
The dilution rate D = 0.28 h⁻¹
The concentration of lactose in the feed
The effluent S = 0.10 g/L
Also;
Saturation C* = 8 mg/l
To calculate the steady-state biomass, we use the formula:
The biomass is 0.855 g/L
For a steady-state condition, the oxygen uptake rate can be illustrated by using the formula:
where;
dilution rate (D)
Thus, the steady-state can be expressed as:
The specific rate of oxygen consumption
b)
In the fermentation medium, if the desired DO concentration = 2 mg/L
Here, the oxygen transfer is regarded as the rate-limiting step.
As such, the oxygen transfer rate(OTR) is equivalent to the oxygen uptake rate.
In this scenario, let's determine the oxygen transfer coefficient by using the formula:
where;
= coefficient of oxygen transfer
C* = saturation
Since
Thus, the oxygen transfer coefficient = 159.6 h⁻¹