BIOT 260 |
| Pretreatment of pulp with xylanase before bleaching has received considerable attention in recent years, however, almost all studies focused on chemical pulp such as kraft pulp. In this study, xylanase produced by T. reesei Rut C-30 with coarse corncob meal as the carbon source was used to improve the bleachability and brightness of wheat straw chemomechanical pulp (CMP). The results indicated that the bleachability of the pulp was improved considerably. The treatment also enhanced the effect of the hydrogen peroxide bleaching, decreased the consumption of the bleach agent and increased the brightness effectively. The investigation showed that 50 % hydrogen peroxide was saved after enzymic pretreatment when wheat straw CMP was bleached to the same brightness with only one-stage conventional H2O2 treatment. If wheat straw CMP was bleached with high consistence two-stage hydrogen peroxide and XP3P3 bleaching sequence after enzymatic pretreatment, the brightness could reach 60.31 % ISO. This study of xylanase pretreatment of wheat straw CMP led to satisfactory results, which may facilitate the utilization of wheat straw for pulping. |
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Poster Session
5:30 PM-7:30 PM, Wednesday, August 22, 2007 BCEC -- Exhibit Hall - B2, Poster
Division of Biochemical Technology |