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Q47 Saccharonnces cerevisiae is cultured in a chemostat (continuous fermentation) at a dilution rate of0.5 h'l. The feed substrate concentration is 10 g.L1. The biomass concentration in the chemostat atsteady state ill be gL'l.Assumptions: Feed is sterile, maintenance is negligible and maximum biomass yield mth respect tosubstrate is 0.4 (g biomass per g ethanol). . . . . . . 11 sMicrobial growth kinetics is given by ,1! - "_ K. + swhere ,u is specific gromh rate (hl), ,u, = 0.7 h'1,K; = 0.3 gL'l and s is substrate concentration(g.L").

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