Ozonation of organic compounds in alkaline aqueous media

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Abstract
Effect of pH on the aqueous phase ozonation of various organic compounds was investigated. The reaction was accelerated in alkaline media due to the formation of active hydroxyl radical by an interaction of ozone with hydroxide ion. However, in a strongly alkaline media (pH < 11.9), hydroxyl radical dissociated into less reactive oxygen ion and the efficiency of ozonation decreased. By means of the theory of gas absorption accompanied by chemical reaction, it was found that the rate of the decomposition of ozone in the presence of about 300 ppm of 1‐butanol was 5‐80 times larger than that catalyzed only by hydroxide ion in the pH range of 11‐13. Efficiency of ozonation showed that an optimum range of pH for the removal of total organic carbon was 9‐10.