Studies on Release of Adsorbable organic Halide from pulp and Paper Industry their toxicity and control

Abstract

The pollution load in the small pulp and paper mills using agro based raw material newlineis higher than large pulp and paper mills using wood based raw material. This is newlinedue to absence of chemical recovery system in most of the small agro based newlinemills. As a result these mills produce pulp of high kappa number and newlineconsequently high quantity of chlorine or chlorine based chemicals are used in newlinepulp bleaching to achieve desired brightness target level resulting in high level of newlineAOX and not any controlled over chemical consumption for bleaching of pulp. newlineResults of Toxicity studies of E-stage bleach plant effluent shows that it is highly newlinetoxic than the other stage effluent and due to this E-stage effluent needs to be newlinetreated before being discharged to the aquatic environment. newlineReduction in toxicity of bleach plant effluent is also observed after chemical newlinetreatment. This shows that chemical treatment is good technique to reduce the newlinetoxicity of bleach plant effluent up to that level which will not harm to aquatic newlineorganisms. newline