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Oxygen delignification cleans wood fibers before they are actually bleached. It is a necessary method at pulp mills looking to eliminate chlorine-bleaching chemicals in the pulp production process, or to eliminate bleach plant effluents. Oxygen delignification is also an economical alternative for the production of elemental chlorine-free pulp.
Ozone delignification is another economical alternative for eliminating, or partially replacing, the use of chlorine-containing chemicals. |