抄録
The process of dissolved oxygen (DO) consumption and decrease in dissolved substance which consumes DO in water are investigated theoretically by using the concept of stochastic differential. A model to describe the time variation of DO consumption and COD which is an index of dissolved organic compounds decrease is formulated.Laboratory experiments are. performed in order to examine the characteristics of the time variation of DO consumption and COD decrease. The experimental results show that the time variation includes the component which fluctuates stochastically. We also attempt to simulate the process of DO consumption and COD decrease.It seems that the proposed model can replicate the tendency of the process which includes both the deterministic and stochastic components.
