3. Results and Discussion
In this work, Kraft effluent treatment was evaluated by combining in sequence activated sludge and
ozone processes. The Kraft effluent samples were first submitted to biological treatment and then
ozonized at pH 8.3 and 10 for 60 minutes. The physical-chemical parameters (TOC, COD, total
phenols and color) were measured during both processes. The characteristics of the Kraft E1 effluent
used in this study are described in Table 1.