以毒性鉴别评价法评价化工废水处理效果的研究

江苏省某化工厂废水处理设施进、出水经大型Sou（Daphnia magna）急性毒性试验的结果表明，废水在处理前、后均显示毒性。采用毒性鉴别评价的试验程序，对处理设施的进、出水进行了关键毒物的鉴别和评价。发现进水中存在的关键毒物为金属铜离子并共存多种金属和极性有机毒物，而出水中存在的毒物为酸性条件下易被氧化的有毒有机物。该废水处理工艺对废水毒性去除率为77.6%。由此可见，该处理工艺对金属离子有较好的去除，而对有毒有机化合物的去除效果不甚理想，因此，该厂生产工艺和废水处理工艺还有待进一步改进。

Toxicity identification evaluation on efficiency of chemical effluent treatment

Acute toxicity tests of the effluents from both inlet and outlet of the treatment system in a chemical plant in Jiangsu Province were conducted with Daphnia magna.The results showed that both effluents were toxic to this species. Toxicity identification evaluation (TIE) was used to identify the key toxicants in the effluent before and after treatment. The results indicated that Cu 2+ was the key toxicant causing the toxicity of input water, and some metals and polar organics were the coexistent toxicants in the water. The toxicity of output water was caused by some toxic organics, which were easy to be oxidized under acidic conditions. The results also showed that the toxicity removal efficiency reached 77.6% through the treatment process. It could be seen that the effluent treatment process in this plant had a higher efficiency of removing heavy metals, but the removal rate of organic compounds was quite low. It was concluded that the production techniques and the effluent treatment process of this plant were not perfect, and needed to be improved.