Evaluation on effect of following bleaching methods after bagasse pulp oxygen delignification

Nowadays,bleaching methods have to be advanced for clean production of bleached pulp,but oxygen delignification widely used for clean bleaching of wood pulp is hardly applied for bleaching of straw pulps.Here,hleaching of bagasse Soda pulp was carried out with oxygen delignification prior to hypochlorite(H),chlorine dioxide(D) or ozone(Z) bleaching.About 40%of the residual lignin may be removed from bagasse pulp by oxygen delignification,where the lost of pulp viscosity maintained within 100 ml/g.The following bleaching in only one stage was easy to elevate the pulp brightness to 80%ISO or so.Oxygen delignification resulted in the reduction of more than 60%available chlorine in comparison with the individual H bleaching.Because of the outstanding increase of the pollutant in bleaching effluents in turns of OZ,OD,particularly OH,and furthermore,OZ bleaching gave the pulp the best physical strength properties,OZ should be the truly clean beaching pathway to bagasse pulp.