TREATMENT OF WHITE WATER IN PRODUCTION OF PULP FROM RECOVERED WASTE PAPER AND PRODUCTION OF PAPER

摘要

PURPOSE: To facilitate treatment of white water generated in production of pulp from waste recording paper in which a color reaction between a basic dye and a developer is utilized and to reduce the amount of generated industrial wastes. ;CONSTITUTION: To white water generated in production of pulp from recovered waste paper, an aminoaldehyde precondensate is added at ≥60°C so as to generate aminoaldehyde resin particles in white water. Paper made by using the pulp recovered from waste paper and treated white water exhibits a whiteness not much different from that of general paper and COD value of a filtrate of white water generated in papermaking is low. The above-mentioned generated aminoaldehyde resin particles are recycled as an organic pigment. Thereby, the amount of industrial wastes can be reduced.;COPYRIGHT: (C)1993,JPO&Japio