CONTROLLER FOR FERMENTATION OF AEROBIC MICROORGANISM

PURPOSE:To prevent the respiratory rate of an aerobic microorganism from its excessively being determined with ventilation rate by correcting the ventilation rate required by the aerobic microorganism in proportion to the amount thereof according to a corrected ventilation rate corresponding to an active state of the aerobic microorganism. CONSTITUTION:The microbial cell concentration (SS) according to the amount of an aerobic microorganism (1a) in a culture solution (1b) is outputted to an arithmetic unit 10 by a turbidimeter 9. The main ventilation rate required by the aerobic microorganism in proportion to the amount of its own based on the microbial cell concentration (SS) is calculated by a main ventilation rate arithmetic unit (10a). The specific proliferation rate of the aerobic microorganism is calculated based on the microbial cell concentration by a specific proliferation rate arithmetic unit (10b). A corrected ventilation rate corresponding to an active state of the aerobic microorganism is calculated based on the microbial cell concentration, specific proliferation rate and culture time by a corrected ventilation rate arithmetic unit (10d). The main ventilation rate and corrected ventilation rate are then added with an adder (10e), converted into a target ventilation rate (Qa) and outputted to a proportional plus integral plus derivative(PID) regulator 5.