缺氧条件下含氮杂环化合物吡啶毒性削减研究

运用摇瓶试验研究了吡啶废水的降解及其毒性削减规律．结果表明，废水中主要的致毒物质为吡啶和亚硝酸盐，二者的联合作用为相加作用，且亚硝酸盐对发光细菌的毒性比吡啶的大；吡啶降解过程中废水毒性削减的最佳碳氮质量比为8．0左右；在吡啶降解的初始阶段，亚硝酸盐的生成使得废水毒性略有提高，在降解的后阶段，吡啶和亚硝酸盐质量浓度持续降低，废水毒性不断下降直至基本无毒，说明缺氧反硝化是处理吡啶废水，同时降低其毒性的一种有效方法。

Study on Toxicity Reduction of Nitrogen-heterocyclic Compound-pyridine under Anoxic Conditions

The anoxic degradation and toxicity reduction of pyridine,one of the important nitrogen-heterocyclic compounds,were studied by flask-shaking tests.The results indicate that the major toxicants in the wastewater were pyridine and nitrite,and the latter was more virulent than the former.The joint toxicity effect of pyridine and nitrite was additive.The optimal C/N ratio was about 8 for toxicity reduction during anoxic degradation of pyridine.At the beginning of the degradation,the toxicity rose slightly for the yield of nitrite,then declined continuously and finally reached the level of no virulence.It can be concluded that denitrification is a suitable way to degrade pyridine and reduce the toxicity of wastewater containing pyridine.