Denitrifying bacteria are immobilised in gel beads and used in a stirred reactor for removal of nitrate from groundwater. At a nitrate concentration of 3 g m ^-3, the conversion rate is 0.011 g s-1 m-3 catalyst. The effective diffusivity of nitrate in the gel is 1.5 × 10 ^-9 m ² s^-1, the beads are 6 mm in diameter, and the liquid-solid mass-transfer coefficient is 10 ^-5 m s^-1. Km for the immobilised bacteria is approximately 25 g m ^-3. Calculate the observable Thiele modulus with CAs = 1.9 g m ^-3

TLS Online TPP Program

#Question id: 14427

#Section 5: Bioprocess Engineering and Process Biotechnology

In which of the following controllers, the performance will improve with time?

TLS Online TPP Program

#Question id: 14428

#Section 5: Bioprocess Engineering and Process Biotechnology

The sensor, which is an integral part of fermentation equipment, the measured value cannot used directly for control. this type of controlling system is called  

TLS Online TPP Program

#Question id: 14429

#Section 5: Bioprocess Engineering and Process Biotechnology

Which one of the following constants is represented by Kp?

TLS Online TPP Program

#Question id: 14430

#Section 5: Bioprocess Engineering and Process Biotechnology

Which is not correctly match, effect of process variables on mass transfer characteristics?

Process variable	mass transfer characteristics
P. P/V	oxygen transfer rate
q. Impeller tip speed	mixing time
r. Reynolds	number shear rate

TLS Online TPP Program

#Question id: 14431

#Section 5: Bioprocess Engineering and Process Biotechnology

the centrifugal separation of biomass of 80um sized cells of density 1.04kgm^-3 was carried out in a tubular centrifuge having a diameter of 15cm and rotating at 1200 rev/min. calculate the residence time if distance between the liquid surface and the axis of rotation was 0.8cm, the liquid viscosity were 1.0kgm^-3 and 0.013 gcm^-ls-1respectively. 

TLS Online TPP Program

#Question id: 14432

#Section 5: Bioprocess Engineering and Process Biotechnology

the centrifugal separation of biomass of 80um sized cells of density 1.04kgm^-3 was carried out in a tubular centrifuge having a diameter of 15cm and rotating at 1200 rev/min. the axis of rotation was 0.8cm, the liquid viscosity were 1.0kgm^-3 and 0.013 gcm-ls^-1 respectively. Calculate the volumetric capacity of the centrifuge if its length was 40cm?