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International audienceWe study certain classical basic models for bioreactor simulation in case of batch mode withdecay. It is shown that in many cases the two-dimensional differential system describingthe dynamics of the substrate and biomass concentrations can be reduced to an algebraicequation for the biomass together with a single differential equation for the substrate.Then from an analogy with the Henri–Michaelis–Menten enzyme kinetic mechanism asimple model is proposed for a bioreactor in batch mode with decay. Two more modelsare also proposed taking into account the phases of microbial growth. Some propertiesof these two models are studied and compared to classical Monod type models usingcomputer simulations
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