Abstract
Lipophilic wood extractives (LWEs) are natural components of wood, which are liberated from softwood into process water in the production of mechanical pulp (TMP refining or groundwood grinding). These compounds are known to be toxic to aquatic life in the receiving waters. Also, when water circulations are closed these compounds are accumulated in the process waters leading to problems in process operation and in product quality. In this work two different oxidation methods, ozonation and wet oxidation, were studied for die removal of LWEs from circulation waters. Bom studied meuiods are capable of selectively removing the LWEs.
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