影响膜生物反应器同步硝化反硝化因素研究

Influence of Operating Conditions on Simultaneous Nitrification and Denitrification in MBR

通过控制膜生物反应器（MBR）中溶解氧（DO）浓度、碳氮比（C/N）、污泥浓度（MLSS）和水力停留时间（HRT）等摸索了实现同步硝化反硝化的工艺条件，同时对好氧反应器中实现同步硝化反硝化的机理进行了探讨。化学需氧量（COD）在250 mg/L左右，C/N为10~30∶1，MLSS为5 g/L，HRT为5.0 h，DO为0.6~0.8 mg/L时，总氮去除率达86.0%，取得了良好的总氮去除效果，表明由于好氧反应器中缺氧区的存在，控制好操作条件可以实现同步硝化反硝化。体系中氨氮、硝态氮浓度的变化与总氮去除的关系说明短程反硝化现象的存在，而且在实现同步硝化反硝化过程中发挥着重要的作用。

The effect of DO （dissolved oxygen）, C/N （carbon/nitrogen）, MLSS （mixed liquor suspended solids） and HRT （hydraulic retention time） on the SND （simultaneous nitrification and denitrification） in MBR （membrane bioreactor） and the SND mechanism in aerobic reactor is studied . The results indicate that at the COD =250 mg/L, C/N = 10 -30： 1, MLSS =5 g/L, HRT = 5.0 h and DO = 0.6 - 0.8 mg/L, the removal ratio of total nitrogen reaches the climax of 86.0%. The results also show that since anaerobic area exist, the SND can be fulfilled through controlling the operating condition. At the same time, the relationship between the change of the ammonia, nitrate and nitric nitrogen concentration and total nitrogen removal suggests that the existence of the shortcut denitrification phenomena plays an important role in the SND process.