A kinetic study of the reactions between ozone and those lignin compounds which produce an intense color in wastewaters originating from kraft pulping and pulp bleaching processes is reported. A model which accurately predicts the rate of color removal has been developed. The rate of color removal is observed to be linearly dependent upon the aqueous ozone concentration, and the concentration of chromo-genic materials. In addition to removing color, the ozone reaction increases the biological oxygen demand of the wastewater samples.
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