曝气生物滤池中无机氮转化规律与降解数学模型

Transformation Regularity of Inorganic Nitrogen and Mathematical Model of Degradation in Biological Aerated Filter

上向流曝气生物滤池反应器（BAF）中的污水、空气从下往上同向流过滤料层，是一种推流式反应器。为研究其沿程无机氮转化特性，试验装置由下至上共设有4个取样口，研究各区间段由于NH3-N负荷、生物数量及活性等不同引起的沿程无机氮转化特性差异。试验结果表明在水力负荷为1．13～2．38m3／m2h、气水比为4～5：1、沿程DO为2．9～5．9mg／L、NH，-N负荷为0．25～0．5kgNH，-N／m3od、不加任何有机碳源的情况下，反应器内以硝化反应为主，进水中70％以上的NH，-N在相对高度O．52以下部分被硝化。曝气生物滤池沿程N0i—N增加，N0i—N含量较少，TN基本维持平衡。依据Eckenfelder模式，BAF滤池中NH3-N沿程转化动力学方程为：S=Soexp（-0．0134D／L1.261）。

Biological aerated filter （BAF） reactor in which the sewage and gas flow upward through the filtering media layer is one of the pushing reactors. In order to study its characteristics of inorganic nitrogen transformation along the reactor, the reactor was divided into four sampling sites and the different characteristics of inorganic nitrogen transformation caused by different organic loading and NH3-N loading as well as the biological quantity and activity of each section was researched. The result indicates when hydraulic loading rate is 1.13-2.38 m3/m2·h, ratio of air and water is 4-5：1, DO is 2.9-5.9 mg/L and NH3-N loading is 0.25- 0.5 kgNH3-N/m3·d without any organic carbon, the major reaction is nitration in the reactor. More than 70 % NH3-N in the influent is nitrified when the relative height of the filter is less than 0.52. Total nitrogen （TN） basically maintains balanced, NO3--N increases, and there is few NO2-N in the reactor. According to Eckenfelder model, the kinetics equation of NH3-N transformation is Se=Soexp（-0.013 4D/L）.