4. Conclusions
An activated sludge/O3/pH 10 treatment was able to remove over 80% of COD, TOC and color
from Kraft E1 effluent. Considering only the total phenols, the efficiency removal was around 70%.
The ozonation post-treatment carried out at pH 8.3 also showed better results than the single process.
The COD, TOC, color and total phenols removal efficiencies obtained were 75.5, 59.1, 77 and 52.3%,
respectively.
From the comparison of the results obtained by combined processes and single processes, it is
possible to conclude that only the use of combined processes can be applied to increase the
degradation ratio for all the studied parameters, with less ozone consumption and consequently, cost
reduction.