Abstract

Degradation of Carcinogenic Compounds by Using Chlorine Dioxide in Jute Cady Pulp Effluents

Author(s): Divya Prakash, Satish Kumar and N. P. Lamba

The chlorinated organic compounds formed during bleaching of pulp have proved to be highly toxic to aquatic organism that affects unfavorably human health as well. These compounds are quite continual in the environment and readily accumulate in organisms. The objective of present investigation is to identify a set of chlorination conditions for Jute Cady pulp in which the production of chlorinated phenolic compounds would be minimal without any adverse impact on pulp quality and mainly focus on the optimize brightness i.e. 80%. The results of our other studies indicate that the changes in various C stage bleaching conditions and changes in bleaching sequence can give effluent of lower chlorophenolic compounds but the final brightness is different. In this study, a target pulp brightness of 80% ISO was chosen and to get the target brightness the bleach chemical demand has been changed. In sequential bleaching (i.e. CEH), the bleach chemical demand is 13.5%, but when the sequence changed to D50C50EH, the bleach chemical demand drops to 10.25% and the toxicity reduces by 44%, In continuation of chlorophenolics compounds, COD and color reduce by 42% and 54%. The beneficial point is that pulp viscosity is increased and target brightness is achieved.