Inlet substrate concentration

Pe, coj, and fio are dimensionless parametas relating to the opoating conditions Pe is Peclet number denoting the inverse of axial mixing intensity, coj denotes the inverse of volumetric loading rate per mass of granules, and ySo daiotes the dimensionless inlet substrate concentration as respectively defined as follows ... 

If we operate two one-liter CSTRs in series at steady state, what will be the concentration of substrate leaving the second reactor The flow rate is 0.5 L/min. The inlet substrate concentration is 50 g/L and the enzyme concentration in the two reactors is maintained at the same value all of the time. Is the two-reactor system more efficient than one reactor whose volume is equal to the sum of the two reactors ... 

You carried out an enzymatic reaction in a 5-L CSTR. The inlet substrate concentration was 100 mmol/L and the flow rate was set 1 L/hr. After a steady-state was reached, the outlet substrate concentration was 10 mmol/L. 

Assume that a chemostat study was performed with a microorganism. The volume of the fermenter content was 1 L. The inlet stream was sterile. The flow rate and inlet substrate concentration were varied and the steady-state concentration of glucose in the fermenter was measured and recorded as shown in the table (the data are arbitrary). 

You are going to cultivate yeast, Saccharomyces cerevisiae, by using a 10 m -fermenter your company already owns. You want to find out the amount of ethanol the fermenter can produce. Therefore, a chemostat study was carried out and the Monod kinetic parameters for the microorganism grown in the glucose medium at 30°C, pH 4.8, were found to be Ks = 0.0025 g/L and /imax = 0.25 h-1. The ethanol yield (YP/S) is 0.44 (g/g) and cell yield (Yx/S) is 0.019 (g/g). The inlet substrate concentration is 50 g/L-... 

Consider an organism with the following data for a 1-L chemostat, using an inlet substrate concentration Csi of 30 g/L ... 

A strain of yeast is being cultivated in a 30-L CSTF with a cell recycling system (cell settler) as shown in the following figure. The cell settler was designed so that the cell concentration of its outlet stream is 30 percent of that of its inlet stream, whereas the substrate concentrations of the two streams are the same. The growth rate of the cells can be represented by the Monod kinetics with the parameters Ks = 0.05 g/L, max = 0.3 h-1, and YX/s = 0.025. Calculate the steady-state substrate and cell concentrations in the fermenter. The inlet substrate concentration is 100 g/L and the flow rate is 20 L/hr. The feed stream is sterile. 

A modular continuously stirred glass tank reactor (from Cole-Parmer, Inc., USA) with an effective volume of 2 L was used in the OTASP. Peristaltic pumps were used at the inlet and at the exit of the reactor for feed/harvest, respectively. Aeration and efficient mixing was provided in the reactor temperature and pH were controlled at 25 1 ° C and 7 0.01, respectively, by electronic controllers. A synthetic wastewater with known inlet substrate concentration (in terms of... 

The variables considered for optimization were the same as those used in the work of Costa et al. (5) inlet substrate concentration (S0), cell recycle rate (R), residence time (f,), and flash recycle rate (r). They were determined by Silva et al. (3) as the relevant variables. 

CSBR). In this case the bioconversion is run under approximately steady-state conditions where the position of reaction equilibrium lies toward the products of the conversion. In this case the concentration of product (proportional to Sj — S0 ) at a given reactor residence time becomes a function of both the flow rate (Q) into the reactor and reactor volume, in addition to the factors discussed above for batch mode reactors (i.e., catalyst parameters and density, inlet substrate concentration S and outlet substrate concentration S0). 

Assume that you obtained the Cg versus t curve you calculated in part (a) experimentally. Estimate K/ and by plotting the (Cg - Cs)/ln(Cg /Cg) versus f/ln(Cgj,/Cg) curve according to Eq. (2.38). Is tnis approach reliable Chemostat (continuously stirred-tank reactor) runs with various flow rates were carried out. If the inlet substrate concentration is 300 mol/m and the flow rate is 100 cm / min, what is the steady-state substrate concentration of the outlet The reactor volume is 300 cm. Assume that the enzyme concentration in the reactor is constant so that the same kinetic parameters can be used. 

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