Investigation on Bleaching of Mixed Old Newspaper and Magazine Deinked Pulp with Hydrogen Peroxide

Document Type : Research Paper

Authors

1 M.Sc Graduate of Pulp and Paper Industries, Gorgan University of Agricultural Sciences and Natural Resources (GUASNR), Gorgan, Iran

2 Associate Professor, Dept. of Pulp and Paper Industries, Faculty of Wood and Paper Engineering, GUASNR, Gorgan, Iran

3 Professor, Dept. of Wood and Paper Industries, Faculty of Wood and Paper Engineering, Sari University of Agricultural Sciences and Natural Resources, Sari, Iran

4 Ph.D Candidate of Pulp and Paper Industries, Faculty of Wood and Paper Engineering, GUASNR, Gorgan, Iran

Abstract

In the present research, the effect of different peroxide charges and reaction times were investigated in
hydrogen peroxide bleaching of mixed old newsprint and old magazine deinked pulp. In the
beginning, mixed recycled papers were pulped using conventional method and then deinked by
flotation. In addition, deinked pulps (mixture ratio of 70% ONP and 30% OMG) were bleached with
hydrogen peroxide at different charges of 0.5, 0.75 and 1% from peroxide and times of 30, 60 and 90
min under constant process conditions. The bleached pulps refined with laboratory PFI mill to freeness
of 300 ml, CSF and then standard handsheets (60gm-2) were made from them. The residual peroxide
existing in bleaching liquor, chemical oxygen demand (COD) of bleaching effluent and also the paper
quality properties (optical, physical and strength properties) were measured according to respected
standards. Obtained results indicated that with increase in bleaching times, the residual peroxide in
liquor was decreased but the differences of them was insignificant (P<0.01) with increase in peroxide
charge. Also effluent COD was enhanced significantly with increase in the both peroxide charges and
bleaching times. When the peroxide charge and also the bleaching time were added, the paper
brightness had increased significantly but opacity was not significantly changed (P<0.01). Increasing
the bleaching agent of peroxide has not been shown any significant influence on the paper strength
properties. However increasing the bleaching time led to significant improve in these properties.

Keywords

References

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Forest and Wood Products
Volume 67, Issue 3 - Serial Number 3
October 2014
Pages 503-516

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