摘要：Deinking is an important step in the recycling process for waste paper and old newsprint.Deinking process is the heart of recycling process of old newsprint which decides the quality of thenewsprint produced. In traditional deinking process large amount of chemicals are required which makesthis method expensive, pollution intensive and also the quality of the news print produced is not upto themark. In the present study an effort has been made to adopt biotechnological approach in deinking of oldnewsprint with an objective to make this process eco-friendly, cost competitive and to produce qualitynews print. Fungal cellulase enzyme produced from isolated fungus Trichoderma longibrachiatum via SSFwas used as deinking aid. Results showed that highest enzyme activity could be achieved at a pH of 5.5and at a temperature of 50-600C. Utilization of the cellulase enzyme thus produced from the isolatedfungus Trichoderma longibrachiatum used as deinking aid helped in replacing the deinking chemicalsused during deinking of Old News Print. This further improved the optical and strength properties ofdeinked pulp with significant improvement in its final pulp yield, along with reduction in pollution load in thewastewater generated from the recycling process of deinking.
关键词：Cellulase; COD; ONP; Optical and Physical properties; Trichoderma longibrachiatum.
