Abstract: Study on the effects of sonolysis, ozonolysis and US/O₃ system on the decomposition of p-chlorophenol in aqueous solutions indicated that in the cases of US/O₃ system, individual ozonolysis and sonolysis, the decomposition rate of p-chlorophenol reached 78.78%, 56.20%, 2.79% after a 16-min reaction while its CODcr (chemical oxygen demand) removal rate was 97.02%, 62.17%, 3.67% after a 120-min reaction. The decomposition reaction of p-chlorophenol follows pseudo-first-order kinetics. The enhancement factors of p-chlorophenol and its COD_cr under US/O₃ system reached 63% and 237% respectively. The main intermediates during the decomposition include catechol, hydroquinone, p-benzoquinone, phenol, fumaric acid, maleic acid, oxalic acid and formic acid. The decomposition mechanism of p-chlorophenol was also discussed.

Key words: US/O₃, p-chlorophenol, Synergetic effect, Decomposition mechanism

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