pH-Tolerant Xylanases Pave the Way for “Slot-In” Bleach Boosting Application Without Acidification, 2016 Pulping, Engineering, Environmental, Recycling, Sustainability (PEERS) Conference Proceedings

The practical application of bio-bleaching to reduce bleach and chemical usage in bleach plants has been limited due to a number of complications; pH-tolerant xylanases solve the problems.  The newest generation of robust xylanase bio-bleaching enzyme products, termed XBB-V, allows for a “slot-in” application tolerant of harsh pH and temperature conditions, thus eliminating the need for acidification prior to treatment. Bleach reduction and brightness improvement with XBB-V has been assessed on a variety of fiber types in numerous laboratory studies and subsequent mill-scale trials.  Chlorine dioxide reductions as high as 30% were achieved during mill trials while maintaining or exceeding target brightness, all without any capital cost expenditures or brownstock acidification.  Laboratory XBB-V treatments on brownstock obtained from pulp mills have also shown chlorine dioxide savings in the 15 – 25+% range, and brightness gains as high as 3 ISO points at equivalent bleach dosage.  Robust mill-tailored xylanase products coupled with specialized expertise in enzymatic treatment of pulp and paper minimizes risk and maximizes the value of XBB-V applications. 

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