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亚硝酸盐对聚磷菌厌氧代谢的影响

Keywords: 聚磷菌,亚硝酸盐,放磷,反硝化吸磷

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Abstract:

为进一步认识聚磷菌(phosphateaccumulatingorganism,PAOs)的代谢机制以及影响因素,在厌氧-好氧交替运行的SBR反应器中,采用人工配水,富集了含量高达80%以上的聚磷菌CandidatusAccumulibacterPhos-phates,在此基础上,用静态试验的方法研究了突然投加不同质量浓度的亚硝酸盐(ρ(NO2--N)=0、5、10、20、40mg/L)对聚磷菌厌氧放磷的影响.结果表明,前60min,随着起始ρ(NO2--N)从0mg/L提高到40mg/L,释磷量不断增加,起始ρ(NO2--N)为40mg/L的反应器比起始ρ(NO2--N)为0mg/L的反应器释磷量增加了近60%,而乙酸吸收速率和PHA合成量却几乎下降了20%.60min后,ρ(PO34--P),ρ(NO2--N)以及ρPHA都出现下降趋势,系统发生了反硝化吸磷.结果表明,此系统富集的PAOs中,一部分具有反硝化除磷的功能,还有一部分会因为亚硝酸盐的进入对其发生毒害而自溶.

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