摘要
以单级自养脱氮污泥为研究对象,采用批式试验的方式,分析在不同进水水质条件下系统内生成的中间产物的种类及其含量,研究了单级自养脱氮污泥的厌氧氨氧化反应的代谢特征。实验结果表明,单级自养脱氮污泥具有厌氧氨氧化反应功能。部分NH4+和NO2-是按照Graaf提出的厌氧氨氧化代谢途径去除的:NO2-首先被还原为NH2OH,生成的NH2OH则与系统内的NH4+反应生成N2H4,N2H4继续被转化为N2实现氮的去除。还有部分NH4+和NO2-是按照另外一条厌氧氨氧化反应代谢途径去除的:NH2OH与NO2-在缺氧条件下被转化为N2O,N2O则进一步被转化为N2而实现氮的去除,同时NH4+被氧化为NH2OH。该途径中NH4+转化为NH2OH的反应和N2O转化为N2的反应可能是相互耦合的过程,但关于这点还需进一步证实。
We explore the characteristics of anaerobic ammonium oxidation （ANAMMOX） using sludge drawn from a one step, completely autotrophic nitrogen removal system. Batch experiments are adopted. The quality and quantity of the intermediates formed in the system are analyzed. The results show that the sludge possesses the ANAMMOX function. Some of the NH4^＋ and NO2^- are removed in the ANAMMOX metabolic pathway. That is to say, NO2^- first is reduced to NH2OH, and then NH2OH reacts with NH4^＋ to form N2H4, which subsequently is converted to N2. Other portions of the NH4^＋ and NO2^- are removed in a different ANAMMOX metabolic pathway in which the NH2OH and NO2^- are converted to N2O, then the N2O is converted to N2, and NH4^＋ is converted to NH2OH. The coupling between the NH4^＋ to NH2OH conversion process and the process of N2O being converted to N2 needs further research.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第6期721-726,共6页
Journal of Chongqing University
基金
国家自然科学基金资助项目(50608071)
教育部科学技术研究重大项目(308020)
重庆大学研究生创新项目(200801A1A0180277)
关键词
单级自养脱氮
厌氧氨氧化
中间产物
代谢途径
one-step completely autotrophic nitrogen removal
anaerobic ammonium oxidation （ANAMMOX）
intermediates
metabolic pathway
