Acta Scientiarum Naturalium Universitatis Pekinensis

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Thermo-Lability of Nitrifying Activity in Biological Aerated Filter

XIE Shuguang1,   

  • Received:2004-02-27 Online:2005-03-20 Published:2005-03-20



Abstract: The effect of temperature on nitrification in a two-stage BAF system used for the treatment of ammonia-rich river water was investigated. The rapid increase of water temperature in spring induced a decrease of the ammonia removal efficiency. However, when the water temperatures were equal to or above 5℃, there was no sign of adverse effect of temperature rise on nitrification. The short-term temperature effects on the activity of nitrifying biofilm acclimated to very cold temperature (about 0.5℃) and to moderate temperature (15℃) were also investigated. The results indicated the former activity was seriously affected by the increase of temperature, but the latter activity was not thermo-labile. The cold-adapted response should be seriously considered to model the temperature effect on nitrification in a BAF system. Temperature effect on nitrification became more profound at lower temperature.

Key words: thermo-lability, nitrification, low temperature, biofilm activity

摘要: 考察了温度对处理氨氮较高的河水的两级曝气生物滤池系统中硝化反应的影响。春季温度的快速升高导致了氨氮去除率的降低。但当水温不低于5℃时,温度升高对硝化反应并没有负面影响。短期温度变化对硝化生物膜活性的影响研究表明,温度升高对长期适应于低温(0.5℃)的硝化生物膜活性影响很大,但对于适应于常温(15℃)的硝化生物膜并没有表现出热不稳定性效应。 用模型表示温度对曝气生物滤池中硝化反应影响时,必须认真考虑冷适应反应,低温下温度对硝化反应影响尤为显著。

关键词: 热不稳定性, 硝化反应, 低温, 生物膜活性

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