A macroscopic model describing yield and maintenance relationships in aerobic fermentation processes
| Autor: | J. J. Heijnen, J. A. Roels |
|---|---|
| Rok vydání: | 1981 |
| Předmět: |
Arrhenius equation
Chemistry Ecology Enthalpy Biomass Thermodynamics chemistry.chemical_element Bioengineering Applied Microbiology and Biotechnology Substrate (marine biology) Degree (temperature) symbols.namesake chemistry.chemical_compound Yield (chemistry) Carbon dioxide symbols Carbon Biotechnology |
| Zdroj: | Biotechnology and Bioengineering. 23:739-763 |
| ISSN: | 1097-0290 0006-3592 |
| DOI: | 10.1002/bit.260230407 |
| Popis: | Summary The present paper presents a generalized treatment of the principles of elemental and enthalpy balances which are applied to aerobic fermentation processes. It is shown that strict relations do exist between the various yield factors of biomass or product on substrate, oxygen, carbon dioxide, and between the various maintenance coefficients. These relations are confirmed from the existing body of literature data on yield and maintenance coefficients. Another consequence of the application of elemental balances is the existence of limits for the maximum biomass yield on substrate and oxygen, which depend on the degree of reduction of the substrate. Furthermore a simple model is proposed for the estimation of yield coefficients on substrates with different degree of reduction. It appears from this model that substrates with a high degree of reduction are C limited and substrates with a low degree of reduction are energy limited. Finally the effects of temperature on yield and maintenance coefficients are analyzed from the existing body of literature data. It can be concluded that the maintenance coefficients follow an Arrhenius type of relationship and that yield is temperature independent. The literature data seem to indicate that a degree of reduction of about 4 is optimal for the carbon and energy needs for biomass formation. |
| Databáze: | OpenAIRE |
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