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电气石对厌氧氨氧化菌驯化与反应器启动的影响

Keywords: 厌氧氨氧化,电气石,驯化,启动,氮去除

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Abstract:

为了研究电气石对厌氧氨氧化菌驯化过程的影响,采用2个平行的连续搅拌式生物反应器,其中一个添加电气石(记为R1),另一个未添加电气石作为空白对照(记为R2).2个反应器均在第23天观察到显著的NH+4-N和NO-2-N同时去除,即表现出厌氧氨氧化活性.添加电气石反应器R2的污泥适应期比对照反应器R1缩短42d(R2为12d,R1为54d),且最高氮负荷达到205.0mg/(L·d),比对照表现出更好的耐负荷冲击能力.此外,电气石可以调控pH和氧化还原电位使其保持在厌氧氨氧化菌适合范围内,为驯化提供稳定环境.厌氧氨氧化活性批式实验显示,添加电气石驯化得到的菌体的SAA最高比对照增加48.8%,微生物胞外聚合物(extracellularpolymericsubstances,EPS)检测结果显示,添加电气石反应器R2的多糖、蛋白质和总EPS分别比对照反应器R1增加7.6%、86.7%和43.8%,说明电气石可以促进微生物生长代谢,提高厌氧氨氧化反应活性.粒径与扫描电子显微镜检测说明:电气石并不利于污泥颗粒化,而是大部分污泥与电气石分散生长.谱系分析说明:驯化过程中,微生物组成由接种活性污泥中大量杆菌与丝状菌逐渐演变,筛选出如反硝化菌、亚硝化菌等功能菌种.

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