Peracetic acid (purchased from Fluka Chemica) treatment was conducted in polyethylene bags containing 0.3% distilled peracetic acid on pulp (as active oxygen) and the quantity of water required to achieve a pulp consistency of 10%. No adjustment of the pH of the pulp suspension was made after the addition of peracetic acid. After kneading, the pulp was placed in a water bath with a constant temperature of 75 °C. After 90 minutes of treatment, the pulps were washed in the same manner outlined for the OD process. The concentration of active oxygen in the peracetic acid was determined using the method described by Amini and Webster [16].