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- In a fed-batch culture operating with intermittent addition of lactose solution, values ofthe following parameters are given at time t = 2, when the system is at a quasi-steady state. 1.Determine the initial volume of the culture 2. Determine the concentration of growth-limiting substrate and the total amount ofbiomass in the vessel at a quasi-steady state. 3. At which scenario of bioprocessing, a fed-batch system is recommended to be applied?Develop a spreadsheet to predict as functions of time with concentration, volimme and permeate flows for a batch ultrafiltration. Assume that the flux depends on concentration as follows: J(L/M²/H) = A*EXP(-bC) where C is the retentate concentration in g/l. Assume that the recirculation rate is kept high enough that shear rate dependence is eliminated. Do a sample run with C.= 0.5 g/l, Cfinal = 50 g/l, A = 50, and b = 0.02. Assume a filtration area of 19.4M² and an initial volume of 3255 L. Assume σ (protein) = 1.0 or σ (protein) = 0.95 or σ (protein) = 0.90.continuous disc stack centrifuge is operated at 5000 rpm for separation of tukers' yeast. At a feed rate of 60 min21, thirty of the cells are recovered. For operation at constant centrifuge speed, solids recovery is inversely proportional to the flow rate. (a) What flow rate is required to achieve 90% cell recovery if the centrifuge speed is maintained at 5000rpm thi What operating speed is required to achieve 90% recovery at a feed rate of 60 min211).
- An amino acid of interest was produced in a fed-batch culture using glucose in the feed medium. The initial volume of the quasi-steady-state culture was V0= 500 L, and the nutrient solution containing glucose was added at a constant flow rate of F = 50 L/h.Data: X0 (at the beginning of feeding) = 20 g/L, S0 = 300 g/L, max = 0.2 h-1, KS = 0.5 g/L and Y x/s= 0.3 g/g a) Determine the volume of the culture at t = 10hb) Determine the concentration of glucose at t = 10 hc) determine the concentration and total mass of cells at t = 10 hd) If product is associated with growth with α = 1.5 and P0 = 0.1 g/L, determine the concentration of product at t = 10h.For the production of a secondary metabolic by Streptomyces coelicolor, a fed batch was performed. At the end of the single batch phase, the following conditions were reached in the reactor: V=10000L, cell concentration X=10g/L and product concentration P=0.1g/L. The feeding was then started with constant flow F= 200L/h, for 100h. Knowing that the substrate concentration in the feeding medium was SF= 80g/L and in the fermentation medium it was practically null, calculate: a) The final concentration of cells and productb) If the reactor were fed with a constant dilution rate (D), what should be the value of D used to reach the same cell concentration obtained in the situation with constant flow?μp= 0.01 g of product/ (g of cells.h)Y x/s = 0.15g cells/g of substratevolume of the quasi-steady-state culture was V0= 500 L, and the nutrient solution containing glucose was added at a constant flow rate of F = 50 L/h.Data: X0 (at the beginning of feeding) = 20 g/L, S0 = 300 g/L, max = 0.2 h-1, KS = 0.5 g/L and Y x/s= 0.3 g/g a) Determine the volume of the culture at t = 10hb) Determine the concentration of glucose at t = 10 hc) determine the concentration and total mass of cells at t = 10 hd) If product is associated with growth with α = 1.5 and P0 = 0.1 g/L, determine the concentration of product at t = 10h. (answer:P = 67,55 g/L)
- (b) A Food material containing Bacillus stearothermophilus PS1518 as an indicator organism ts subjected to heat sterilization at 121 C. Calculate the time required to reduce the organism to one tenth of the original number. Fo value for the organism is 4 minutes and the decimal reduction time , D, at 116°C is 40 minutes. Assume operation is at constant temperature of 121°C. HINT Fo = -To 10 dt Where Fo = equivalent exposure time at 121°C of the actual exposure time at a variable temperature To = the reference temperature =121 C, z=10 = number ofC necessary for10fold increase in FSweet sorghum juice is used as sole carbon source for ethanol production by Saccharomyces cerevisiae. The overall in situ sterilisation duration is 40 minutes at 120 0C for a pilot reactor (50 L) which is filled with 60% of working volume. The non-sterile medium consists of 3.28 x 106 contaminants L-1. During the autoclaving process, you have noticed that the time taken for heating and cooling are 18 minutes and 15 minutes, respectively. As a process engineer, explain if you agree with this sterilisation practice by using quantitative analysis.As a public health engieer you have been tasked wiyh designing a plug flow reactor for the disinfection of Giardia lamblia using either free chlorine and monochloramine. The objective is a three log reduction in the concentration of Giardia lamblia. The kinetics of chlorine decay can be described by a first order coefficient of 0.1 d-1. It is also given that the appropriate contact time, t10, equals the hydrualic residence time (HRT or td) of the plug flow reactor. Question: At a temperature of 5oC and a pH of 7.0, what is the volume of the PFR if the flowrate of the water to be disinfected is 1000 L/d for chlorine and monochloramine Disinfection data in the table below can be used.
- What are the potential applications for microalgae and how can they be grown for biofuel? What are the different system processes that are required and their advantages and disadvantages? . Explain how a raceway would be used to grow microalgae. What are the commercial bottlenecks. What are the typical growth rates and what are the requirements for microalgal growth and implications for CO2 sequestration using microalgae (1.8 kg of CO2 per produces 1 kg of microalgae)?A culture consisting of 100 litres of nutrient medium containing 12 g l-1 of growth limiting substrate is inoculated with 10g of bacteria in a batch fermenter. The yield of biomass from substrate is 0.05 g g-1 . The maintenance coefficient is 2.0 g g-1 h -1 . The specific rate of product formation due to maintenance is 1.0 h-1 . The maximum specific growth rate of the organism is 0.3 h -1 . YPX= 7.7 and product formation is directly linked with metabolism. a) What is the time required to produce 15 g of biomass? !!!!! ANS IS 3.07 HRS!!!! STEPS on how to reach this pleaseThe data below were obtained for the growth of a pure culture of Escherichia coli in nutrient broth at a temperature of 37°C. Determine (1) the specific growth rate and (2) generation time of E. coli and the duration of the (3) lag and (4) log (or exponential) phases. (ln 2 = 0.693) Time (h) 0 1 2 3 4 8 16 32 Bacterial No./mL 104.1 103.9 104.4 105.5 106.5 107.7 108.0 107.6