毒性鉴别评价方法对城镇污水处理厂去除水中有毒物质的分析实例

以江苏省常州市城北污水算处理厂的进水、活性污泥处理系统的出水以及A^2O处理工艺的出水为研究对象，对进出水进行Daphnia magna急性毒性试验。结果表明，进水对Daphnia magna具有24h急性毒性，经过活性污泥处理工艺处理及A^2O处理工艺处理，两股出水均不显示24h急性毒性，采用毒性鉴别评价（Toxicity Identification Evaluation,TE）方法对进水进行监测和评价，发现曝气可去除进水的毒性，C18固相提取亦可去除进水毒性，进水中存在的主要毒物为易挥发的非极性有机化合物，进一步检测可知，进水中的关键毒物主要为邻丙基甲醛肟、1，1－甲基乙基－2－甲氧基苯酚、2－氮，氮二甲基苯甲醇等，此外，对2个处理系统出水进行GC／MS分析，可知出水中关键毒物基本被去除。

A CASE STUDY ON THE EVALUATION OF CITY EFFLUENT TREATMENT SYSTEM BY TIE

In this study,complex mixture,activated sludge outlet water and A2O outlet water in waste-water treatment plant of Changzhou were selected as study obejects.Toxicity identification evaluation(TIE) was used to identify the key toxicants in wastewater.The results showed that complex mix-ture had 24h acute toxicity to Daphnia magna.Additionally,because the Toxicity of effluent couldbe removed by air-pumped and also be removed by C18 solid-extracted, the main toxicants in com-plex mixture were non-polat organic compounds.Additionally,the results of toxicity test and GC/MS analysis showed that the key toxicants in out-water of two systems were almost removed.