Abstract
The decomposition of 2‐chlorophenol by the UV/O3 process was studied under various pH values, O3 input mass flow rates and UV intensities to investigate the removal efficiencies of reactants and organic intermediates. The decomposition rate of 2‐chlorophenol by UV/O3 process was found to increase with increasing O3 input dosage, light intensity and pH value, but the mineralization of organic intermediates was found to be less influenced, especially for alkaline solutions where HCO3 ‐ and CO2‐ 3 species may accumulate as free radical scavenger. The 2‐chlorophenol in aqueous solutions is completely destroyed by UV/O3 process within 15 minutes. The mineralization efficiencies of 2‐chlorophenol in aqueous solution is above 90% under adequate reaction conditions within three hours. The temporal behavior of the decomposition of 2‐chlorophenol in aqueous solutions at pH 11 by UV/O3 process can be described by the mixed two‐step consecutive kinetic model. The apparent kinetic equations regarding the effects of pH, ozone flowrate, and UV light intensity on the decomposition of 2‐chlorophenol by UV/O3 process were established.
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