Exercise: Downstream Processing

Questions for: Downstream Processing

Which of the following is considered as a pretreatment to the biological feeds?
A:
Heating to denature the proteins
B:
Addition of filter aids to increase the porosity
C:
Addition of electrolytes
D:
All of the above
Answer: D
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The solvent flux across the membrane can be expressed as (where A is the area, Lp is the membrane permeability, σ is the reflection point, Δp is applied pressure and Δπ is the osmotic pressure)
A:
J = Lp(Δp - σΔπ)
B:
J/A = Lp(Δp - σΔπ)
C:
J = Lp/σΔπ
D:
J/A = Lp/Δp
Answer: A
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Start up expenses in a fermentation industry varies from
A:
0-5% of the capital cost
B:
10-15% of the capital cost
C:
5-10% of the capital cost
D:
15-20% of the capital cost
Answer: C
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Micro filtration refers to the separation of suspended material such as bacteria by using a membrane with spore sizes of
A:
0.02 to 10Ξm
B:
1-10A°
C:
20-30Ξm
D:
10-200A°
Answer: A
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For cost analysis in a fermentor system, the depreciation cost varies from
A:
5-6% of the capital cost
B:
6-7% of the capital cost
C:
6-10% of the capital cost
D:
8-10% of the capital cost
Answer: C
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