RELEASING OF SOLUBLE AND COLLOIDAL SUBSTANCES IN PULP SLURRIES

A lot of soluble and colloidal substances of pulp are extracted by wat er. A common behaviour of all these substances was searched by the met hod of COD, BOD5, polyelectrolyte titration and hydration factor's mea surement. Observed results have confirmed the influence of water envir onment upon the character of extraction process. Different results, ex cept groundwood, were observed for pulp extraction by distilled and re circulation water. Generally, under comparable conditions, a higher am ount of substances is released from pulp in recirculated than in disti lled water.