SBR反应阶段污染物去除规律及有机污染物降解动力学分析

Study on Pollutants Removal Performance and Dynamics Analysis of Organic Pollutants Degradation at SBR Reaction Stage

通过考察序批式间歇活性污泥法(SBR)工艺反应阶段COD和NH_3-N、TN含量随曝气时间的变化趋势,研究SBR反应阶段污染物的降解规律。结果表明,曝气0.5 h,COD去除率达到80%;曝气3 h,COD和NH_3-N去除率分别达到96%和99%以上,达到了GB 18918-2002一级A标准。TN去除率由初始的29%提高到曝气3 h的61.1%,随后其去除率稳定在60%。曝气池内DO含量、ORP、p H的变化能够反映污染物降解程度。动力学模型分析表明,有机污染物降解过程符合1级反应动力学关系S_r=(142.6 mg/L)(1-10^(-0.6t/h)),去除的COD实验值与回归模型拟合值相对误差和相关系数分别为4.02%和0.969。因此该1级反应动力学模型能够预测SBR反应阶段有机污染物的降解规律。

Variations of COD, NI-IrN and TN content with different aeration time at SBR reaction stage was investigated to analyze the degradation tendency of pollutants. The results showed that after 0.5 h of aeration, the COD removal rate could reach 80%. After 3 h of aeration, the removal rates of COD and NH3-N were increased to 96% and 99%, respectively, which met GB 18918--2002 standard of level A. The removal rate of IN increasod from the 29% initially to 61.1% after 3 h of aeration, and when stabilized at 60%. It was also found that DO, ORP and pH could reflect the degradation degree of poUutants. The kinetic model analysis showed that the degradation process of organic pollutants was in accordance with the first order reaction kinetics of Sr=（142.6 mg/L）（1-10^-0.6t/h）, and the corresponding relative error and correlation coefficient of the COD removal rate and the regression model were 4.02% and 0.969, respectively. Therefore, the first-order reaction kinetics model might be used to predict the degradation process of organic pollutants at SBR reaction stage.