Investigation of radical reactions for efficiency improvement in ozone hydrogen peroxide treatment

It was verified by laboratory-scale experiments that the two-port ozone inj ection method was more advantageous for reaction efficiency in the ozone-hy drogen peroxide treatment than the conventional one-port ozone injection me thod under the condition of same ozone dose. The reason for this effectiven ess was also investigated in detail by computer simulations in the wide ran ge of the rate constant of OH radical reacting with TOC (k(TOC)). The labor atory-scale experiments revealed that the amount of TOC decomposed (Delta T OC) increased by up to 41 % by the two-port injection method, indicating a 27% improvement in DeltaO(3)/Delta TOC. A detailed investigation of these e xperimental 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 increas ed more strikingly than that with ozone. Furthermore, it was found that the smaller the k(TOC) value within 10(5)-10(9) M(-1)s(-1) was, the more advan tageous for the reaction efficiency the two-port injection method was.