Study of Enzymatic Deinking Effects on Optical and Physical Properties of Accelerated Aged Newspaper Pulp

Authors

Abstract

Enzymatic deinkability of the newly printed and accelerated aged newspapers is evaluated. Enzymatic deinking was carried out with cellulase prepared from Aspergillus niger in a slightly acidic medium. The results showed that in both groups of papers, enzymatic deinking led to significant changes in freeness and yield values of the pulps as well as thickness, density, brightness and opacity of the prepared handsheets as compared with those of the control sample (without deinking). In addition, comparison of the newly printed and accelerated aged newspapers showed that in the first group of papers, both enzyme value and reaction time significantly influenced pulp freeness whereas in the second group only reaction time was the influencing factor. On the other hand, no significant differences were observed between the optical and physical properties of both groups of deinked pulps, i.e., cellulase acted equivalently in deinking of both groups of papers and accelerated aging had no negative effect on its efficiency

Keywords


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