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A2O工艺中N2O的产生与逸散特征

Keywords: 温室气体,氧化亚氮,污水处理,A2O工艺,nosZ

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Abstract:

目前污水处理过程中产生温室气体的问题已经引起普遍关注。本文通过实验室小试,研究了不同污水水质条件下A2O工艺中N2O的产生特征,以及氧化亚氮还原酶编码基因nosZ含量对N2O产生量的影响。结果表明,在A2O工艺中的各单元均有N2O产生,其中厌氧池产生量最大,约占总产生量的32%~85%;A2O工艺产生的N2O主要通过逸散进入大气,少量随二沉池出水进入到环境中。N2O的产生量与污泥中nosZ的含量成负相关,而碳源和DO对含有nosZ基因的反硝化细菌有明显的影响,低DO环境和充足的碳源能够极大的促进其含量的提高,从而显著减少N2O的产生量。

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