The BOD5 value of a waste-water feed stream to an activated-sludge unit is S0 = 300 mg/l, and the effluent is desired to be S = 30 mg/l. The feed flow rate is F = 2× 10^7 l/day. For the recycle ratio of α = 0.5 and a steady-state biomass concentration of X = 5 g/l, Use the following kinetic parameters:

 

calculate Biomass concentration in recycle (Xr).

TLS Online TPP Program

#Question id: 14418

#Section 5: Bioprocess Engineering and Process Biotechnology

It is required to provide a 20-m^3 fermenter with air at a rate of 10 m^3 min ^-I for a fermentation lasting 100 hours. From an investigation of the filter material to be used, the optimum linear air velocity was shown to be 0.15 m sec^-I, at which the value of K was 1.535 cm^-I. calculate The dimensions (radius and depth) of the filter? The air in the fermentation plant contained approximately 200 micro-organisms m^-3. The acceptable degree of contamination is one in a thousand.

______________

TLS Online TPP Program

#Question id: 28108

#Section 5: Bioprocess Engineering and Process Biotechnology

Consider the following reversible reaction. In a 3.00 liter container, the following  amounts are found in equilibrium at 400 oC: 0.0420 mole N₂, 0.516 mole H₂ and 0.0357 mole NH3. Evaluate K_eq.

N2(g) + 3H2(g) ↔ 2NH3(g)

TLS Online TPP Program

#Question id: 4808

#Section 3: Genetics, Cellular and Molecular Biology

When F1 female Drosophila of the genotype AaBbCc is test crossed, ( Gene A and B located at 10 map unit in transe configuration but gene C are independently assort for both gene. Which of the following test cross progeny that is that is more frequent?

TLS Online TPP Program

#Question id: 18808

#Section 7: Recombinant DNA technology and Other Tools in Biotechnology

What would happen if serum is omitted from the ELISA, but all other steps remain same?

TLS Online TPP Program

#Question id: 1085

#Section 3: Genetics, Cellular and Molecular Biology

Which of the following statements about a G protein signaling pathway is true?