含氮杂环化合物吡啶的缺氧降解和毒性削减研究

运用摇瓶试验，研究了含氮杂环化合物吡啶的缺氧降解情况、毒性削减规律以及它们之间的关系。结果表明，在吡啶缺氧降解过程中，有利于废水毒性削减的C／N比为8左右；废水中主要致毒物质为吡啶和亚硝酸盐，且亚硝酸盐的毒性大于吡啶的毒性，两者的联合为毒性相加作用；在整个吡啶降解过程中，废水毒性与吡啶降解和亚硝酸盐的产生有着直接联系，毒性削减时间长短与吡啶初始浓度有关。

Study on degradation and toxicity reduction of pyridine under anoxic conditions

The study was focused on the anoxic degradation and toxicity reduction of pyridine, one of the important nitrogenous heterocyclic compounds by flask-shaking tests. The results indicated that the optimal ratio of COD to nitrate nitrogen was about 8 for toxicity reduction during anoxic degradation of pyridine. 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. During the whole degradation of pyridine, there was direct relation between toxicity reduction and the concentration of pyridine and nitrite, and the initial concentration of pyridine affected the time of toxicity reduction.