title: Enzymatic deinking of laser printed office waste papers: some governing parameters on deinking efficiency.
abstract: The protocol for the enzymatic deinking of laser printed waste papers on a laboratory scale using cellulase (C) and hemicellulase (H) of Aspergillus niger (Amano) was developed as an effective method for paper recycling. A maximum deinking efficiency of almost 73% by the enzyme combination of C:H was obtained using the deinking conditions of pulping consistency of 1.0% (w/v) with the pulping time of 1.0min, temperature of 50 degrees C, pH=3.5, agitation rate of 60rpm, pulp concentration of 4% (w/v), concentration of each enzyme of 2.5U/g air dried pulp and the enzyme ratio of 1:1. The deinking efficiency was further enhanced to 95% using the optimized flotation system consisting of pH=6.0, Tween 80 of concentration 0.5% (w/w), working air flow rate of 10.0L/min and temperature of 45 degrees C. The deinked papers were found to exhibit properties comparable to the commercial papers suggesting the effectiveness of the enzymatic process developed.
authors.affiliation: Fermentation and Enzyme Technology Laboratory, School of Biological Sciences, Universiti Sains Malaysia, Minden, 11800, Penang, Malaysia.
authors.forename: C K
authors.initials: CK
authors.lastname: Lee
authors.forename: I
authors.initials: I
authors.lastname: Darah
authors.forename: C O
authors.initials: CO
authors.lastname: Ibrahim
mesh_terms: D001230:Aspergillus / Q000201:enzymology; D003247:Conservation of Natural Resources / Q000379:methods*; D004798:Enzymes / Q000378:metabolism*; D006868:Hydrolysis; D007281:Ink; D008422:Materials Testing; D010209:Paper; D012037:Refuse Disposal / Q000379:methods*; D012233:Rhizopus / Q000201:enzymology
chemical_list: D004798:Enzymes