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Paper Information

Journal:   IRANIAN JOURNAL OF WOOD AND PAPER SCIENCE RESEARCH   fall 2018 , Volume 33 , Number 3 (64) ; Page(s) 381 To 390.

Investigating the effect of pH on cellulase enzyme efficiency on the OCC pulp properties

Author(s):  ASADPOUR GH.*, Boroshkian H., RESALATY H.
* Department of Wood and Paper, Faculty of Natural Resources, Sari University of Agricultural Sciences and Natural Resources, Iran
The purpose of this study is to investigate the effect of pH on cellulase enzyme activity measuring drainage and strength properties of OCC pulp. Recycled OCC pulp was pretreated at consistency 0. 4 percent, in constant condition of temperature; 50˚ C, duration 1 hour and pH range of: 4-4. 5, 8-8. 5 applying cellulase enzyme at three levels (0. 1, 0. 3 and 0. 5 percent based on pulp dry weight). The results showed that pretreatment of cellulase enhances the freeness of pulp in comparison with the control samples, but by increasing the concentration of enzyme, the freeness of pulp was reduced in pH: 4-4. 5 the highest freeness was measured at the level of 0. 1 percent and in pH: 8-8. 5 at the level of 0. 3 percent. Also, papers were evaluated for strength properties. The results showed that the increase in the use of cellulase enzyme has increased the tensile and burst strength index. As, in the alkaline pH, the effect of the cellulase enzyme on the increase of these strength was higher than the acid pH. The OCC pulp tear strength index, only in low levels of cellulase enzyme and in acidic pH, increased strength was observed, but with increasing enzyme consumption, there was a decrease in tear strength. Also, for strength to crushing, there was no specific trend regarding the amount of enzyme and pH on enzyme function.
Keyword(s): OCC pulp,cellulase enzyme,freeness,pH effect
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