Effect of Eucalyptus Kraft Pulp Enzyme Bleaching on Effluent Quality and Bio-Treatability

摘要

The filtrate and pulp quality of different enzymatic pre-bleaching conditions were characterized. Bio-treatability of the effluents was evaluated. Enzymatic pre-bleaching of Eucalyptus pulp was carried out in 4 different conditions of pH and enzyme dosage/The best pulp quality was achieved at pH 7, when smaller kappa number, higher pulp brightness and smaller amount of hexenuronic acid were observed. However, in this condition a higher yield loss and effluent COD load were observed. For all bio-treatment assays, the COD removal was higher than 85%.