Fillat Ursula, Roncero M Blanca
Textile and Paper Engineering Department, Universitat Politècnica de Catalunya, Colom 11, E-08222 Terrassa, Spain.
Bioresour Technol. 2010 Jan;101(1):181-7. doi: 10.1016/j.biortech.2009.07.020. Epub 2009 Aug 20.
High-quality flax pulp was bleached in a short totally-chlorine-free (TCF) sequence. The LP biobleaching sequence includes an enzyme treatment with laccase in the presence of HBT as mediator (L stage) and a hydrogen peroxide stage (P stage). The operating conditions for the laccase HBT system were optimized by using a sequential statistical plan involving four variables, the influence of which on the properties of the pulp after the P stage was examined over enclosed operation conditions regarding a future industrial application. Mathematical models accurately predicting both pulp properties in terms of the previous four variables. This biobleaching sequence allows obtaining an increase in ISO brightness of 40% and a delignification of 80%. Process variables optimization in flax pulp biobleaching allows establishing the application conditions most appropriated to obtain certain pulp properties and that turn out to be easily adaptable to existing industrial processes. As a novelty, toxicity measurements were determined in L stage effluents. The results of toxicity show that it is possible to apply this LP sequence without having a negative environmental impact.
高品质亚麻浆采用短流程全无氯（TCF）工艺进行漂白。亚麻浆生物漂白流程包括在HBT作为媒介存在的情况下用漆酶进行酶处理（L阶段）和过氧化氢阶段（P阶段）。通过使用涉及四个变量的顺序统计计划，对漆酶HBT系统的操作条件进行了优化，在未来工业应用的封闭操作条件下，研究了这四个变量对P阶段后纸浆性能的影响。数学模型能够根据前四个变量准确预测纸浆性能。这种生物漂白流程可使ISO亮度提高40%，脱木素率达到80%。亚麻浆生物漂白过程中工艺变量的优化有助于确定最适合获得特定纸浆性能的应用条件，并且这些条件很容易适应现有的工业流程。作为一项创新，对L阶段废水进行了毒性测量。毒性结果表明，应用这种LP流程不会对环境产生负面影响。
