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环境化学  2015 

DOI:10.7524/j.issn.0254-6108.2014.05.001

Keywords: C/N,反硝化,还原速率

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Abstract:

为了研究不同C/N条件下驯化的微生物的反硝化特性,采用SBR反应器在4种C/N比(0、5、10、15)条件下对微生物进行驯化.在此基础上,通过批次试验分别考察以NO2--N、NO3--N及NO3--N+NO2--N作为电子受体时,驯化的微生物的反硝化特性.试验结果表明,对于4种C/N比条件下驯化后的微生物,NO2--N和NO3--N两种电子受体均可以被完全还原,但还原速率差异明显.当以NO2--N为电子受体时,4种C/N条件下驯化的微生物的还原速率分别为0.67、1.10、1.66、0.24mgN·L-1·min-1.当以NO3--N为电子受体时,随着C/N的增加,4种C/N条件下驯化的微生物的还原速率逐渐增大,分别为0.31、0.61、0.82mgN·L-1·min-1和1.01mgN·L-1·min-1.然而以NO3--N+NO2--N为电子受体时,在C/N为0和5条件下驯化的微生物还原NO2--N的速率高于还原NO3--N的速率,而在C/N为10和15条件下却相反.此外,在初始NOx--N浓度及pH值相同条件下,NO2--N单独还原过程引起的pH增量高于NO3--N单独还原过程,而较低C/N条件下驯化的微生物同步还原NO3--N和NO2--N时,系统内pH的增量较高.

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