Comparision of ozonation and wet oxidation for the destruction of lipophilic wood extractives from paper mill circulation water

Lipophilic wood extractives (LWEs) are natural components of wood, which ar e liberated from softwood into process water in the production of mechanica l pulp (TMP refining or groundwood grinding). These compounds are known to be toxic to aquatic life in the receiving waters. Also, when water circulat ions are closed these compounds are accumulated in the process waters leadi ng to problems in process operation and in product quality. In this work tw o different oxidation methods, ozonation and wet oxidation, were studied fo r the removal of LWEs from circulation waters. Both studied methods are cap able of selectively removing the LWEs.