Study on the Organic Chlorides in the Effluents of Straw Pulp Bleaching

The effluents from the C stage and H stage of CEH straw pulp bleaching process show intensive toxicity with more than 95% of light restraining rate to the luminous bacteria.The effluent from the C stage shows intensive mutagenicity to Salmonella TA98 and TA100 and the components of mutagenicity are dissolvable in the fat.Total organic chlorides of bleaching effluent can be detected by both resin absorption method and activated carbon absorption method.One ton bleached pulp can generate 2～3 kg AOX in the straw pulp mills(one stage bleaching and CEH).It is found in commercial activated sludge treatment of the bleaching effluent that 50% removal rate of AOX is reached and more than 50% removal rate of AOX is reached in anaerobic treatment of lab batch trial.