Dynamics Equation of Ozone Decomposition in Recycling Cooling Water

Ozone can be used in treatment of industrial recycling cooling water. In order to guide practice more efficiently, the dynamics equation of ozone decomposition in recycling cooling water was established. The research deducted mathematical model of the decomposition. It is that: -d[O₃]/[O₃]dt = k\´₁[OH^-] + k"₂[OH^-]^x[COD_Cr]. Then experiment water of different concentrations multiple was confected, adjusted alkalinty with NaHCO₃, ozone of different concentrations was led into, ozone decomposition rate was mensurated. When pH was 8.0, 8.5, 9.0, 9.5 and COD_Cr was 1, 3, 6, 7 mg/L, the interrelated data was determined. The dynamics equation of ozone decomposition at the experimental condition is: -d[O₃]/[O₃]dt = 75460times[OH^-] +4.990times[OH^-]^0.228[COD_Cr]. Analysing the mathetics model, we can see that affecting decomposition factors are not only [OH^-], but also COD_Cr in water, include the microbe, organic compound, reductive inorganic compound and so on. In practical using, it should monitor water quality continuously or intermittently, adjust ozone quantity according to the pH and COD_Cr in the water, at the same time, it also should control COD_Cr of the system so that it can ensure treatment effect.