Effect of microbial treatment on brightness and heat-induced brightness reversion of high-yield pulps
✍ Scribed by Wenzhu Tang; Xuezhi Li; Jian Zhao; Jun Yue; Hua Yue; Yinbo Qu
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 2009
- Tongue
- English
- Weight
- 263 KB
- Volume
- 84
- Category
- Article
- ISSN
- 0268-2575
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✦ Synopsis
Abstract
BACKGROUND: The manufacture of high‐yield pulps is attractive due to its efficient utilization of lignocellulosic material. However, their rapid brightness reversion when exposed to heat and light restricts their more widespread use in high‐quality papers. This study investigated the potential of bio‐treatment with more than 30 species of fungi and yeasts to inhibit heat‐induced yellowing of high‐yield pulps.
RESULTS: Treatment with Penicillium sp. ZCF34, Saccharomyces cerevisiae INVS2 and 724 reduced the brightness reversion and increased the brightness of wheat straw semi‐chemical pulp after 4 days incubation (postcolor number decreased by 33.96%, 66.42% and 57.09%, and brightness increased by 0.84%ISO, 0.48%ISO and 0.89%ISO, respectively). Phanerochaete chrysosporium W14 treatment was best for depressing yellowing of bleached aspen CTMP (chemi‐thermo‐mechanical pulp) and Saccharomyces cerevisiae AH22 treatment gave the highest brightness and a lower postcolor number. For unbleached aspen CTMP, treatment with Fusarium concolor X4 and Saccharomyces cerevisiae H158 was effective in improving brightness and brightness stability after 2 and 4 days incubation, respectively.
CONCLUSION: Treatment with some microorganisms increased pulp brightness and strongly suppressed heat‐induced yellowing. It offers an option for improving the brightness stability of high yield pulps and some valuable information for bio‐pulping and bio‐bleaching with microbial treatment. Copyright © 2009 Society of Chemical Industry