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厌氧氨氧化工艺的抑制现象

DOI: 10.3724/SP.J.1145.2012.00502, PP. 502-510

Keywords: 厌氧氨氧化工艺,废水生物脱氮,抑制,基质,有机物,盐度,磷酸盐,硫化物,调控对策

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Abstract:

厌氧氨氧化(anammox)工艺因其高效低耗优势,在废水生物脱氮领域中具有广阔的应用前景.然而,基质、有机物、盐度、重金属、磷酸盐及硫化物等物质对anammox工艺产生的抑制作用制约了工艺的推广应用.基质主要通过游离氨和游离亚硝酸对anammox产生抑制,而温度和ph是基质抑制的重要调控参数.非致毒性有机物对anammox的作用因其种类跟浓度而异.在较低的浓度条件下对anammox的抑制作用不显著,而高于抑制阈值将严重抑制anammox.其抑制机制尚无定论.部分研究证明致毒性有机物(醇、醛、酚及抗生素等)对anammox具有抑制作用,但研究有待拓展深化.超过抑制阈值的盐度会抑制anammox活性,但合适的盐度(3~15gl-1nacl)却能够促进anammox生物颗粒的形成.重金属对anammox的抑制报道较少.因试验条件及菌种等的差异使得磷酸盐及硫化物对anammox的抑制在不同试验中存在很大差异.anammox抑制是可控的,通过ph和温度调节、基质浓度及负荷控制、污泥驯化以及添加辅助剂等方法可解除或缓解抑制.建议今后在特种废水的anammox脱氮、复合抑制以及anammox抑制的分子生态学机理等方面开展深入研究.

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