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常温低氨氮污水生物滤池部分亚硝化的实现

Keywords: 短程硝化,部分亚硝化,厌氧氨氧化,生物脱氮,生物滤池

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Abstract:

采用火山岩活性生物陶粒滤料反应器,在常温(8~25℃)、低ρ(NH4+-N)(60~90mg/L)条件下,通过控制曝气,实现了NO2--N的积累,系统启动后NO2--N的累积率大于80%.结果表明:DO控制是实现亚硝化的主要途径,而游离氨(FA)抑制可作为优选氨氧化细菌(AOB)的辅助途径,水力停留时间(HRT)的调整是控制亚硝化比例的主要手段;间歇运行条件下,ρ(NH4+-N)、ρ(NO2--N)和ρ(NO3--N)的变化均具有零级反应动力学特征,且NH4+-N的转化速率为4.32mg/(L.h),NO2--N与NO3--N的积累速率分别为3.05、0.40mg/(L.h),根据此规律,将实现部分亚硝化的HRT确定为9~14h.

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