Advances in Biochemical Engineering, Volume 009: Microbial by T.K. Ghose ,A. Fiechter, N.Blakebrough

By T.K. Ghose ,A. Fiechter, N.Blakebrough

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31 32 32 34 35 42 43 46 46 48 50 52 54 54 1. I n t r o d u c t i o n The mechanism of liquid hydrocarbon uptake by microorganisms represents an important problem. The kinetics of microbial growth on hydrocarbon are a basis for industrial development of hydrocarbon processes. The kinetic model for cell growth on hydrocarbon should be based on the mechanism of hydrocarbon uptake. e. the aqueous and the hydrocarbon phase. Numerous discussions have taken place concerning the mechanism of liquid hydrocarbon uptake by microorganisms.

22. 3 Kinetic Model for Growth Lineweaver-Bulk plots of specific growth rates and n-tetradecane concentrations for the three sets of operating conditions gave an almost straight line for C. intermedia IFO 0761, as shown in Fig. 23. The maximum specific growth rate obtained from the Lineweaver-Bulk plot in Fig. 4 h - l , but this was quite different from the experimental value shown in Fig. 22. Therefore, Monod's model is not valid for the growth rate of C. intermedia on a n-tetradecane medium. C.

Eq. (8), is available for liquidliquid dispersions in agitation systems, the growth rate is then correlated with the operating conditions in the same way as Eq. tmax~2 + SN2. 2 uC Paq " Furthermore, Moo-Young and Shimizu [25] obtained a relationship between oil droplet size and power consumption for agitation systems, Eq. (10), and correlated the specific growth rate with the power consumption per unit volume, Eq. (11), as follows: (1o) d-po - 0 . 0 2 3 and °8 /2 =/2max ~3 + S~_~)0"8 (11) where /33 - ( 0 " 0 2 3 ) 2 ~ 2 Equations (9) and (11) show good agreement for batch and continuous fermentations with the experimental data of Moo-Young et al.

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