A new radical reaction model for the ozone-hydrogen peroxide treatment, which was much simpler than current models such as SBH and TFG, has been developed by computer simulation in order to investigate a new reactor for this treatment process. It was revealed that the simulation results by using this new developed model were in good agreement with the experimental results in terms of the variation in the concentration of ozone in both gas and liquid phase, hydrogen peroxide and TOC, indicating the appropriateness of this new model. Thus, it was considered that this new model was very convenient for analysis of radical reactions because of its simplicity.

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It was verified by laboratory-scale experiments that the two-port ozone injection method was more advantageous for reaction efficiency in the ozone-hydrogen peroxide treatment than the conventional one-port ozone injection method under the condition of same ozone dose. The reason for this effectiveness was also investigated in detail by computer simulations in the wide range of the rate constant of OH radical reacting with TOC (kTOC). The laboratory-scale experiments revealed that the amount of TOC decomposed (delta TOC) increased by up to 41% by the two-port injection method, indicating a 27% improvement in delta O3/delta TOC. A detailed investigation of these experimental results by computer simulations showed that by injecting ozone in two ports the amount of ozone consumed for the OH radical formation was increased more remarkably than that of ozone consumed for the radical chain reactions, and that the amount of OH radical reacting with TOC was increased more strikingly than that with ozone. Furthermore, it was found that the smaller the kTOC value with 10(5)-10(9) M-1s-1 was, the more advantageous for the reaction efficiency the two-port injection method was.