Degradation of phenol, Asulam and lignin in aqueous solution by Ozonation

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Abstract
Phenol, the herbicide asulam (methylsulfanilyl carbamate) and lignin were degraded by ozonation. The addition of Fe3+ did not affect the disappearance rates of phenol and asulam appreciably, whereas UV illumination accelerated the disappearance rate. Fe3+ under UV illumination showed only a slight effect on the disappearance rate, but a fairly large effect on TOC elimination. The degradation of the intermediate compounds of asulam including aromatic compounds and organic acids, under UV illumination was accelerated by the addition of Fe3+. A possible degradation process of asulam by ozonation was proposed on the basis of intermediate and final products identified.