抄録
Bioreactor of iron oxidizing bacteria for industrial purposes, such as treatment of waste water drainage, are often a type of the recycle reactor, which is composed of three stages; oxidation, carrier settling and carrier recycling. It is difficult to understand the cell condition in the reactor, because the cells attach on the surface of carrier.
The purpose of this work is to characterize this bioreactor quantitatively from an analysis of phe-nomena caused by shifting temperature, during continuous operation for one year. The temperature dependence of bacteria yield, maximum specific growth rate and saturation constant were obtained from the result of batch experiment in the range of 15°C to 30°C. These parameter values were in the same range of the results reported by early researches. In the continuous operation during one year, the oxidation ability of the bioreactor was kept constant level. From a mathematical model, it was confirmed that cell number increased to supplement the decline of oxidation ability when it becomes low temperature.
