常温下短程硝化实现及稳定性试验研究

Partial Nitrification Realization and Stability at Normal Temperature

以自配模拟氨氮废水为研究对象,在全程硝化污泥的基础上通过控制低曝气量和提高反应器进水pH值,在较低的DO质量浓度和较高pH值条件下完成了短程硝化污泥的驯化,系统中的NO2--N积累率稳定在95%以上;逐渐提高硝化阶段的曝气量、降低进水溶液的pH值,短程硝化过程没有被破坏;稳定的短程硝化系统改为定时控制,过度曝气6 d后,NO2--N的积累率仅剩43.7%,硝化类型由短程硝化转变为全程硝化。

Taking artificiaUy prepared high ammonia nitrogen wastewater as the research object, on the basis of full nitrification denitrification sludge, through controlling the aeration and the pH of influent water, short-cut nitrification-denitrification sludge with low DO and high pH was achieved. The nitrite nitrogen accumulation rate could above 95%. Then to gradually increase the aeration rate and lower the influent pH, the phenomenon that short-cut nitrification was not destroyed was found. When real time control was changed to fixed time control, on the 6th day after excessive aeration, accumulation of nitrite fell to 43.7% and the style of nitrification from short-cut nitrification changed to full nitrification with 6 d excessive aeration.