Studies on enzymatic deinking processes for old newsprint with cellulase

Enzymatic deinking and fiber modification of old newsprint were studied with cellulase from Aspergillus L22.The suitable conditions for the old newsprint deinking and fiber modification were chosen as follows:0.4 IU/g CMCase,30 min,pH5.0 and 3.5%pulp consistency.Under these conditions,the old newsprint pulp was deinked effectively,and the physical properties and drainability of the deinked pulp were also improved.