Implementation of a Pressurized Hydrogen Peroxide Stage and ECF Conversion at Western Pulp Limited, Squamish Division, 1998 Pulping Conference Proceedings

A new pressurized hydrogen peroxide stage (Epo) was installed at the Western Pulp Squamish Operation following extensive laboratory trials. The objectives of the project were to:

· Decrease AOX in final treated effluent;
· Decrease TOX concentration in fully bleached pulp;
· Minimize ClO 2 usage to allow full time ECF operation at a higher production rate;
· Lower bleaching cost; and
· Improve pulp quality; particularly higher ECF brightness.

Sufficient flexibility was built in the design to run two sequences (DEpoD, DEoEpoD). This paper discusses:

· Laboratory bleaching trials;
· Equipment and process changes required to install a pressurized Epo stage;
· Epo stage optimization and impact on effluent and pulp quality; and
· Bleaching chemical consumption and cost.

Author: Oei, J., Pryke, D. C.
Implementation of a Pressurized Hydrogen Peroxide Stage and
Implementation of a Pressurized Hydrogen Peroxide Stage and ECF Conversion at Western Pulp Limited, Squamish Division, 1998 Pulping Conference Proceedings
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