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硝酸盐对富磷剩余污泥厌氧消化的影响试验

Keywords: 富磷剩余污泥,硝酸盐,厌氧消化,影响试验

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Abstract:

以某采用A/O生物除磷工艺水质净化厂排出的富磷剩余污泥为研究对象,利用棕色消化瓶设计了4组厌氧消化试验,通过向其中投加NaNO3,考察硝酸盐对污泥消化过程的影响。结果表明,硝酸盐的存在导致VSS平均变化速率比空白样快28.09mg/(L·d),并且对污泥消化过程中的产甲烷阶段有一定的抑制作用;当硝酸盐存在时,厌氧氨氧化作用的发生导致上清液中的NNH+4变化速率减慢,硝酸盐对污泥消化过程中磷的释放有明显的抑制作用,当硝酸盐浓度高于60mg/L时,抑制作用明显。

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