Fermentation Reactors Questions

• A fed-batch reactor containing 1 g.l-1 of substrate in 2 litre of medium. It is fed with 1 g.l-l of substrate at the rate of 1 litre per hour. After 10 hours, the concentration of substrate in the reactor was 0.5 g.l-1 . The mass of substrate that was used by the culture in the reactor was
• A continuous reactor at steady state contains 0.04 g.l-1 of biomass and 0.02 g.l-1 of phenol. The feed contained 0.1 g.l-1 of phenol. The biomass yield would be
• In a continuous reactor, the medium contains 40 g.l-1 of maltose and the medium flow rate is 10 litres per hour and the effluent contains 20 g.l-l of lactate. What is the productivity of lactate production from this reactor?
• On a glucose medium, the growth of an organism is characterized by the following Monod model and stoichiometric parameters μm = 0.3 h-1, Ks =0.05 g.l-1 and Yxs = 0.3 g.g-1 When this organism is grown in a 2 litre continuous on a medium containing 10 g.l-1 of glucose added at 1 l.h-1, the steady state concentration of biomass in the reactor will be
• Which of the following would not be subjected to the "glucose effect"?
• A culture system with constant environmental conditions maintained through continual provision of nutrient and removal of wastes is called __________ culture system.
• Fed batch reactors is used to produce vinegar because
• In a fluidized bed reactor, the function of the disengagement zone is to
• A chemostat has a liquid volume of 2 litres and is being fed at a rate of 4 litres per hour. Dilution rate for this reactor will be
• The cellular productivity in a continuous stirred tank fermenter (CSTF) increases with an increase in the dilution rate and reaches a maximum value. If the dilution rate is increased beyond the maximum point, the productivity will
• Unsteady state mass balance for dynamic model of continuous stirred tank reactor (CSTR) is
• In batch culture, protogon is produced from peptone during the stationary phase with a yield of 0.4 protogon mg per g of peptone. If it is to be produced in a chemostat at a dilution rate of 0.5 h-1 from a medium containing 10 g.l-1 of peptone, then the rate of protogon synthesis would be
• The lowest biomass yield in a culture of Escherichia coli will be in
• The main reason for production of antibiotics in fed batch reactors is
• When a culture of fermenting yeast becomes metabolically uncoupled, ethanol
• For organisms growing in a chemostat, the specific growth rate
• Mixing profiles closest to plug flow are observed in
• Toxins accumulated in a reactor can lead to low biomass yields probably due to which of the following?
• The continuous cultures are not widely used in industry because
• Saccharomyces cerevisiae produces high biomass yields at low glucose concentrations and high dissolved oxygen concentrations. Which of the following should be followed for maximizing its biomass productivity?