Abstract
Pulp mill effluent in the pH range of 7 to 8.5 was found most suitable for ozone treatment. Both resin acids and phenolic compounds were degraded in similar efficiency. Among the various resin acids, dehydroabietic acid (DHA) was found to be the most resistant to ozone degradation. The determination of DHA in the treated effluent can therefore reflect the degree of completeness of the effluent treatment. A simple and fast HPLC method reported previously for the determination of DHA was found to serve well for this purpose. Results are demonstrated by treatments of various pulp mill effluents.
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