ENVIRONMENTALLY FRIENDLY BLEACHING OF DISSOLVING CHEMICAL SULPHITE WOOD PULP AND CHARACTERIZATION OF WASTE WATER
UDC 676.16
Abstract
The aim of the work is the environmental assessment for bleaching and alkali treatment of dissolving chemical pulp. Samples of the original unbleached pulp: industrial hard bisulfite pulp with a high mass fraction of lignin, traditionally used for the production of paper, and soft sulfite pulp with a low content of lignin, usually used to produce dissolving chemical pulp. In order to reduce the environmental impact, bleaching and alkali treatment were carried out according to the original technologies developed by the authors: bisulfite pulp - according to the ECF technology using two oxidizing bleaching reagents by scheme Pa-E-Ch1-HE-Ch2-A; sulfite pulp - according to the TCF-technology using one oxidizing bleaching agent by scheme Pa-E-HE-P-A in just 4 stages. Produced samples of pulp according to the standardized quality indicators, meet the requirements of the norms for wood sulphite pulp CA grade P (for nitration). The environmental characteristics of wastewater from bleaching and alkali treatment of both samples using the developed ECF and TCF technologies after biological treatment in terms of the main indicators (COD, BOD, AOX) comply with EU standards.
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