POST D0 TOWER BRIGHTNESS • USEFUL OR NOT?, 2013 PEERS Conference

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Post D0 brightness has long been the subject of spirited debate on whether or not you should even measure it for bleach plant control or stage performance evaluation. Many mills have measured in the past and used it to adjust the ClO2 dosage according to its results, while many mills do not see any value in using this measurement. The D0 and Eop stages perform together in that the D0 stage oxidizes the lignin using ClO2, but then the Eop stage dissolves the oxidized lignin by adding caustic. For this reason, many mills do not measure brightness or kappa until after the Eop stage.