Performance and efficiency of old newspaper deinking by combining cellulase/hemicellulase with laccase-violuric acid system
- Shandong Key Laboratory of Pulp and Paper Engineering, Shandong Institute of Light Industry, Changqing, Jinan 250353 (China)
Performance and efficiency of old newspaper (ONP) deinking by combining cellulase/hemicellulase with laccase-violuric acid system (LVS) were investigated in this study. Brightness, effective residual ink concentration (ERIC) and physical properties were evaluated for the deinked pulp. Fiber length, coarseness, specific surface area and specific volume were also tested. The changes of dissolved lignin during the deinking processes were measured with UV spectroscopy. The fiber morphology was observed with environmental scanning electronic microscopy (ESEM). Experimental results showed that, compared to the pulp deinked with each individual enzyme, ERIC was lower for the cellulase/hemicellulase-LVS-deinked pulp. This indicated that a synergy existed in ONP deinking using a combination of enzymes. After being bleached by H{sub 2}O{sub 2}, enzyme-combining deinked pulp gave higher brightness and better strength properties. Compared with individual enzyme deinked pulp, average fiber length and coarseness decreased a little for the enzyme-combining deinked pulps. A higher specific surface area and specific volume of the pulp fibers were achieved. UV analysis proved that more lignin was released during the enzyme-combining deinking process. ESEM images showed that more fibrillation was observed on the fiber surface due to synergistic treatment.
- OSTI ID:
- 21217162
- Journal Information:
- Waste Management, Vol. 29, Issue 5; Conference: 1. international conference on environmental management, engineering, planning and economics (CEMEPE), Skiathos (Greece), 24-28 Jun 2007; Other Information: DOI: 10.1016/j.wasman.2008.10.007; PII: S0956-053X(08)00340-1; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0956-053X
- Country of Publication:
- United States
- Language:
- English
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