Abstract:

The absorption and mass transfer process of ozone reaction with p-nitrophenol solution in the bubble column was investigated in this paper.First,ab sorption experiments were carried out in semibatch mode by continuously injecting gaseous ozone into a bubble column containing p-nitrophenol solution at 298 K,and the ab sorption process was simulated.Next,the mass balance equations of ozone absorption in p-nitrophenol solu-tion were estab lished by using the complete mixing model.Then,by utilizing the Matlab ODE program,the simultaneous equations of the mass balance equations and the enhancing factors were solved,thus simulating the variations of ozone concentration and p-nitrophenol concentration in the ab sorption process.The simulated re-suits were finally compared with the measured ones.It is shown that.at appropriate pH.the simulated results
accord well with the measured ones as far as 80%p-nitrophenol is degraded,while there is a certain deviation when p-nitrophenol concentration declines to a certain level.It is also indicated that the complete mixing model is feasible to describe the fluid flow states in both gas and liquid phases in a short bubble column.

Key words: ozone, p-nitrophenol, mass transfer, bubble column, simulation