厌氧氨氧化污泥中氨氧化的潜在电子受体

发布时间：2018-01-09 23:13

本文关键词：厌氧氨氧化污泥中氨氧化的潜在电子受体　出处：《环境科学》2017年07期 　论文类型：期刊论文

【摘要】：通过接种亚硝酸盐型厌氧氨氧化污泥,投加潜在电子受体(亚硝酸盐、Fe~(3+)和硫酸盐)研究了厌氧条件下氨氮氧化的潜在电子受体.结果表明,亚硝酸盐是厌氧氨氧化最适合的电子受体,能够与氨氮在短暂的时间内完全反应;在亚硝酸盐缺乏的情况下,厌氧氨氧化污泥中微生物利用自身细胞有机物将产物硝酸盐转化为亚硝酸盐参与氨氮转化;Fe~(3+)与硫酸盐在氨氮氧化后期出现转化,但是直接还是间接参与还需进一步研究.厌氧氨氧化污泥对氨氮产生过量氧化之前必须以亚硝酸盐为电子受体进行微生物活性激活,并且好氧氨氧化菌和亚硝化菌出现增长,推测微生物产生了H_2O_2.该现象并不可长久持续.虽然其氧化速率较慢,但是过量氧化现象较为明显.因此厌氧氨氧化污泥中肯定存在氨氮过量氧化的现象.厌氧氨氧化污泥对电子的利用顺序是亚硝酸盐、硝酸盐、Fe~(3+)和硫酸盐.
[Abstract]:The potential electron receptors for ammonia-nitrogen oxidation under anaerobic conditions were studied by inoculating nitrite type anaerobic ammonia oxidized sludge with potential electron receptors (nitrite) and sulfate. Nitrite is the most suitable electron receptor for anaerobic ammoxidation and can react completely with ammonia nitrogen in a short time. In the absence of nitrite, microorganisms in anaerobic ammonia-oxidized sludge transform nitrate into nitrite to participate in ammonia-nitrogen conversion by using self-cellular organic matter. Fe~(3) and sulfate were transformed in the late stage of ammonia-nitrogen oxidation. However, the direct or indirect involvement of the anaerobic ammonia oxidation sludge to produce excessive oxidation of ammonia nitrogen must be activated with nitrite as the electron receptor for microbial activity activation before the anaerobic ammonia oxidation sludge to produce excessive oxidation of ammonia nitrogen. Moreover, the growth of aerobic ammonia-oxidizing bacteria and nitrifying bacteria, it is speculated that the microbes produced H _ 2O _ 2. This phenomenon is not sustainable for a long time, although its oxidation rate is relatively slow. But the phenomenon of excessive oxidation is obvious. Therefore, there must be the phenomenon of excessive oxidation of ammonia nitrogen in anaerobic ammonia oxidized sludge. The order of electron utilization in anaerobic ammonia oxidation sludge is nitrite and nitrate. Fe~(3) and sulfate.
【作者单位】：苏州科技大学环境科学与工程学院;苏州科技大学环境生物技术研究所;
【基金】：国家重点研发计划项目(2016YFC0401103) 国家自然科学基金项目(51478284,51408387) 江苏省特色优势学科二期项目江苏省水处理技术与材料协同创新中心项目苏州市分离净化材料与技术重点实验室项目(SZS201512)
【分类号】：X703.1
【正文快照】： 氨氮是水体中主要的污染物之一.硝化反硝化生物脱氮途径的认识,为人类强化水体中氮素转化提供了有效的手段.近年来,人们发现在厌氧的条件下氨氮与亚硝态氮可以进行生化反应,并将其命名为厌氧氨氧化[1].与传统硝化反硝化反应相比,厌氧氨氧化脱氮过程减少了62.5%的供氧量[2],无

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