| 缺氧条件下含氮杂环化合物吲哚和吡啶的共代谢研究 |
| 摘要点击 1253 全文点击 820 投稿时间：2005-01-11 修订日期：2005-04-20 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 吲哚 吡啶 共代谢 缺氧反硝化 硝酸还原酶活性 |
| 英文关键词 indole pyridine cometabolism anoxic denitrification nitrate reductase activity |
|
| 中文摘要 |
| 以含氮杂环化合物吲哚和吡啶为研究对象,在传统的缺氧反硝化机理研究基础上,通过向配制废水中加入硝酸盐氮,研究吡啶和吲哚在缺氧条件下的共代谢作用.结果表明,吡啶和吲哚缺氧共代谢的最佳碳氮比为8.4～8.9之间.硝酸还原酶适宜作用的环境条件为:温度28℃,pH值7.0～7.5.吡啶的加入有利于硝酸还原酶活性的提高,吡啶对吲哚的缺氧降解有协同作用.在最佳碳氮比条件下,当吲哚起始浓度为150mg/L,吲哚和吡啶的浓度比例为1～10之间时,吲哚的降解符合零级动力学规律,反应过程中亚硝酸盐氮基本没有积累.当吡啶和吲哚的浓度比小于0.25时,随着吡啶浓度比例的提高,硝酸还原酶活性及吲哚降解速率的增长较快;当吡啶和吲哚的浓度比大于0.25时,硝酸还原酶活性及吲哚降解速率的增长变得比较缓慢. |
| 英文摘要 |
| Based on the traditional theory of denitrification under anoxic conditions,and with the addition of nitrate,experiments were conducted to investigate the cometabolic biodegradation of nitrogenous heterocyclic compounds-indole and pyridine.Results show that the optimum ratio of COD to nitrate(C/N) is 8.4～8.9.Under the conditions with temperature of 28℃ and pH of 7.0～7.5,the nitrate reductase activity(NRA) is in the best state.Addition of pyridine can promote NRA and the degradation of indole.When the initial concentration of indole is 150mg/L,the concentration ratio of indole to pyridine is 1～10,and under the optimum C/N conditions,the degradation of indole meet with zero-order kinetics.There was no accumulation of nitrite during the reaction.When the concentration ratio of pyridine to indole is less than 0.25,with the increase of pyridine concentration,there is a faster augment rate for NRA and the degradation of indole than the situation when the concentration ratio of pyridine to indole is more than 0.25. |
|
|
|
