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限氧曝气实现亚硝酸型同步硝化反硝化的研究

Keywords: 亚硝酸型同步硝化反硝化,亚硝化菌,限氧,续批式活性污泥

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Abstract:

在(19±1)℃条件下,采用SBR工艺处理低碳氮比实际生活污水,没有外加有机碳源,通过限氧曝气实现了亚硝酸型同步硝化反硝化生物脱氮(simultaneousnitrificationdenitrificationvianitrite,亚硝酸型SND).试验结果表明,较长污泥龄下(50~66d),通过控制曝气量使系统溶解氧处于较低水平,好氧末端ρDO<2.0mg/L,平均ρDO≈0.65mg/L,不仅可在常温条件下实现短程硝化,ρ(NO2--N)/ρ(NOx--N)稳定在95%以上,而且可同时在该好氧硝化系统中获得高效的反硝化效果,稳定运行后,经亚硝酸型SND途径的总氮去除率(ESND)平均为52%,最高可以达到63.1%.试验分析表明,低ρDO水平是实现亚硝酸型SND的关键因素,通过低ρDO影响硝化菌群的构成、反硝化菌的缺氧微环境以及有机物和ρ(NH4+-N)的降解特性,促进了亚硝酸型SND的形成.

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