Abstract
Xylanase treatment with on-site enzyme production was introduced into the hardwood kraft pulp bleaching process (C-E/O-dnD) at Yonago mill in October, 1998.A thermostable xylanase from a microorganism, Bacillus sp.S-2113, that we isolated through screening was selected for use in this process.The xylanase-containing culture was applied to the bleaching process without removing the bacterial cells from the culture medium.Two years have passed since the xylanase treatment operation, with onsite enzyme production, was begun, and so far, this operation has been working well.The ECF bleaching sequence will start operation within the year 2000in Yonago mill.The effects of enzyme bleaching in the ECF bleaching process are expected to be even greater then.
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