上向流直接供氧生物膜硝化动力学研究

对上向流直接供氧生物膜硝化动力学进行了试验和讨论。结果表明，在此试验条件下，硝化反应速度随着氯化氨浓度的增加呈现出从半级反应到零级反应的过渡，之后反应速度保持常数，并与氯化氨浓度的变化无关。本文还用不同厚度生物膜对硝化动力学的影响作了试验，发现随着生物膜厚度的减少，其零级硝化反应速度平台也呈现了逐级降低的趋势。本试验研究是在丹麦技术大学环境科学与工程系完成的。

Study on Nitrification Kinetics in Upflow Biofilm and Pure Oxygen

The kinetics of nitrification biofilm in upflow and pure oxygen has been studied. In this study, oxygen and bicarbonate are always excessive and ammonia is a limitated factor. The results show that the nitrify-ing rate is from half order to zero order. After that, the rate keeps constant and independent with ammonia concentration. The critical concentration is 2. 25 mg/L and the kovf = 0. 42 mg/ (m2. d). The effects of biofilm thickness on nitrification rate are also tested. The test shows that zero order nitrification rate decreases with the decrease of biofilm thickness.