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分段进水SBR短程生物脱氮过程中N2O产生及控制

Keywords: 生活污水,短程生物脱氮,分段进水,N2O,好氧反硝化

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Abstract:

利用SBR,控制曝气量为60L/h,利用在线pH曲线控制曝气时间,成功实现了短程生物脱氮过程,并考察了不同进水方式下SBR运行性能及N2O产量。结果表明,分段进水能够有效降低短程生物脱氮过程中外加碳源投加量。在原水进水碳氮比较低时,采用递增进水量的进水方式,能够有效降低生物脱氮过程中NO2-积累量,从而降低系统N2O产量。1次进水、2次等量进水和2次递增进水方式下,生物脱氮过程中N2O产量分别为11.1、8.86和5.04mg/L。硝化过程中NO2--N的积累是导致系统N2O产生的主要原因。部分氨氧化菌(AOB)在限氧条件下以NH4+-N作为电子供体,NO2--N作为电子受体进行反硝化,最终产物是N2O。

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