Journal of South China University of Technology (Natural Science Edition) ›› 2010, Vol. 38 ›› Issue (11): 80-85.doi: 10.3969/j.issn.1000-565X.2010.11.015

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

Comparison of Bleaching Performance Between Screened and Unscreened Wheat Straw Pulps

Li Jun 1.2  Wu Hui-min 1.2  Xu Jun 1.2  Wang Qiang 1.2  Zeng Jian 1.2   

  1. 1.State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China;2.Guangdong Public Laboratory of Paper Technology and Equipment,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2010-01-12 Revised:2010-04-02 Online:2010-11-25 Published:2010-11-25
  • Contact: 徐峻（1979-），男，讲师，主要从事纸浆清洁生产技术与植物资源利用的研究．E-mail：xujun@seut．edu．cn E-mail:ppjunli@scut．edu．cn
  • About author:李军（1972-），男，副教授，主要从事纸浆清洁生产技术和设备的研究．
  • Supported by:

    国家“十一五”科技支撑计划重点项目（2006BAD32B06-2）; 国家自然科学基金-工程科技发展战略研究联合基金资助项目（U0970164）

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Abstract:

Screened and unscreened oxygen-alkali pulps of wheat straw were bleached via QPo and OQPo sequences,and the bleaching effects were compared between screened and unscreened pulp.Furthermore,both the characteristics of the fibers in bleached pulp and the pollution load of the effluent were analyzed.The results show that,as compared with QPo bleaching sequence,OQPo bleaching sequence may result in higher brightness,heavy viscosity loss and low yield for both the screened and the unscreened pulps;that,as compared with the screened pulp,the unscreened pulp is of higher brightness-increasing rate（up to 4.9 percentage points） and total pulp yield（up to 10.6 percentage points）;that the fibers in the screened pulp is about 0.78 mm in weight-average length,which is similar to those in the unscreened pulp,while the fiber coarseness of screened pulp is much higher;and that OQPo bleaching is more environmentally friendly than the traditional CEH bleaching because it completely eliminates absorbable organic halogens and greatly reduces CODCr and BOD5 discharge.

Key words: oxygen-alkali wheat straw pulp, unscreened pulp, screened pulp, totally-chlorine-free bleaching, brightness, yield