废纸脱墨废水的毒性及其污染负荷的研究

Toxicity and Toxicity Load of Dinking Effluents

利用优选的发光细菌对二次纤维脱墨废水的急性毒性作了研究。实验结果表明,两种脱墨工艺条件下的废水毒性大致相似,120 t/d和250 t/d脱墨生产工艺废水急性毒性EC50分别为69.96%和67.78%,均属于毒性级别;其总有机污染负荷CODCr分别为25.71 kg/t浆和20.35 kg/t浆,总毒性排放因子分别为17.88 TU.m3/t浆和15.54 TU.m3/t浆,相当于0.143 g/t浆和0.148 g/t浆的HgCl2。

The toxicity of deinking effluents of secondary fiber was studied by using optimum selected photobacteria. The results showed that the value of EC50 for acute toxicities in deinking effluents, which were from the production lines with capacities of 120 t/d and 250 t/d, were 69.96% and 67. 78% respectively, both reached the level of toxicity. As far as a total organic load is concerned, the value were 25.71 and 20. 35 kg CODcr/t pulp, and the total TEFs were about 17.88 and 15.54 TU·m^3/t pulp respectively, they were equivalent to 0. 143 and 0. 148 g HgCl2/t pulp. Therefore, the toxicity and toxicity emission of secondary fiber deinking effluents should not be neglectable.