COMBINED OZONE DESTRUCTION AND FIBER SCRUBBING IN PAPER PULP MILLS

摘要

2107764 9318226 PCTABS00025 The off gases from an ozone bleaching stage of a paper pulp mill are treated so as to simultaneously destroy ozone in the off gases, and remove fibers (32) entrained in the off gases without the need for an ozone thermal destruct system. The gases are passed into a catenary grid (20) or venturi type scrubber using an alkaline liquid (28) containing dissolved organic material as the scrubbing liquid. The scrubbing liquid preferably is a waste liquid stream from another bleaching stage, such as from an Eo stage (29) having a pH of 9.0 or higher, or a bisulfite liquid stream from a sulfite mill (29).