CEH3段漂白废水的毒性研究

采用发光细菌法对某造纸厂的漂白废水(CEH3段)进行了毒性研究,其中C段废水的毒性最大,其EC50为24.67属于强毒级别;E段、H段以及CEH混合废水的EC50分别为94.10%、98.39%、53.79%,分别属于微毒、微毒、毒性级别;C毒性排放负荷约占废水总毒性排放负荷的78%左右。实验结果表明,漂白废水的毒性排放负荷较大,纸浆废水的TEF(毒性排放因子)约为106.52TU·m3/t,相当于每吨纸浆含10.65gHgCl2的毒性,故对其治理不容忽视。

Study on Toxicity of CEH 3 Stages Bleaching Wastewater

The toxicity of CEH3 Stages bleaching wastewaterhas been studied with photobacteria. The toxicity ofC stage was the strongest, its EC50 was 24.67%, be-longs to strongest toxicity level. The EC50 of E, H,CEH were 94.10%, 98.39%, and 53.79% belong to lowtoxicity, low toxicity and toxicity level respectively.The toxicity emission load of C stage was about 78%of total toxicity emission load. The results showedthat the toxicity of bleaching wastewater was strong,and the toxicity of pulp 106.52 (TU.m3/t) equivalent to10.65gHgCl2, so treatment of bleaching wastewater couldnot neglect.