Enzymatic Bio-bleaching to Elevate Final Brightness and Mitigate Pulp Reversion, TAPPICon22
Enzymatic “Post” Xylanase Bio-Bleaching (Post-XBB) with EDT’s EnzOx is an environmentally friendly, CAPEXfree
technology to elevate final pulp brightness and mitigate brightness reversion between the bleach plant and the
paper machine or pulp dryer. Long pulp storage times, contaminated process water, and residual pulp chromophores
within the bleached pulp can all contribute to significant and highly varying brightness loss following the bleaching
process. Post-XBB treatment effectively mitigates brightness reversion of fully bleached pulp, raises final pulp
brightness following HD storage and wet-end approach flow, and can reduce the variability of final pulp qualities.
Brightness improvement with Post-XBB has been assessed on a variety of pulp types in laboratory studies and
subsequent successful mill-scale applications. Net brightness gains in the range of 1.0 – 2.0 ISO units have been
observed in both lab studies and mill applications, effectively mitigating reversion and in some cases creating net
brightness gains.
Elevating pulp brightness has allowed mills to significantly lower their amount of off-spec pulp and paper, decrease
brightening agent usage, and reduce bleaching chemical usage. Increasing incoming bleach plant Kappa, and thus
yield, while maintaining normal bleach usage has also been explored. Mills have further been able to avoid pulp
reversion over the course of 24+ hour shutdowns by utilizing Post-XBB to preserve brightness in bleached HD
storage chests when reversion challenges might be greatest. Next-generation mill-tailored xylanase-based products,
coupled with specialized expertise in enzymatic treatments of pulp and paper, can minimize risk and maximize value
of Post-XBB applications.
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