Reduction of Toxicity by using Chlorine dioxide in Paper Making

Divya Prakash

Abstract


Elemental chlorine and chlorine compounds are commonly used in the developing countries for bleaching of pulp. The study deals with the bleaching of bamboo pulp with chlorine and chlorine dioxide (25% -100% substitution) and identification of various chlorophenolics compounds. The study has been performed by substituting 25 to 100% of chlorine by chlorine dioxide in C stage. The results show that the formation of total chlorophenolic compounds decrease substantially (82%) at 100% replacement of chlorine by chlorine dioxide in C stage. A 40% reduction in effluent COD and 79% reduction in color value of CEH effluent indicate a significant drop in pollution load. Under same conditions the pulp degradation reduces as the viscosity of pulp is improved by 33% and brightness of pulp is improved by 16.8 point after E stage and 8 point after H stage and CE kappa number is reduced by 4%.


Keywords


Bleaching; Chlorinated phenolics; Bamboo; Effluents; Chlorine dioxide

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