CHEMISTRY OF WATER TREATMENT PROCESSES INVOLVING OZONE, HYDROGEN PEROXIDE AND ULTRAVIOLET RADIATION.

Advanced oxidation processes are defined as those which involve the generation of hydroxyl radicals in sufficient quantity to affect water purification. The theoretical and practical yield of OH from O//3 at high pH, O//3/H//2O//2, O//3/UV and H//2O2/UV systems is reviewed. New data is presented which illustrates the importance of direct photolysis in the O//3/UV process, the effect of the H//2O//2:O//3 ratio in the O//3/H//2O//2 process, and the impact of the low extinction coefficient of H//2O//2 in the H//2O//2/UV process.