中文摘要：

以小试规模A^2／O工艺结合活性污泥数学模型（ASM2D），考察了实际污水中污泥龄为8、10、12、15d时对脱氮除磷的影响，并建立了AVO数学模型进行模拟与优化。结果表明，除碳和脱氮率基本不受污泥龄的影响，去除率分别为80％～88％和57％～65％；聚磷菌释磷和吸磷受污泥龄的影响较大，以12d时脱氮除磷效率为最高，出水基本能达到城镇污水处理厂污染物排放一级标准；COD、NH3-N和P在各反应器内的模拟值与实测值较为接近，在短污泥龄时受模型结构限制，NO3^·-N模拟值与实测值相差较大，在长污泥龄时NO3^·-N的模拟精度达93％，所建立的模型可较好地模拟工艺运行；通过分析模拟优化结果，得出最佳污泥龄约为13d，与试验结果基本相吻合。

英文摘要：

Based on a laboratory-scale A^2/O process acclimated with real wastewater, and combining with activated sludge model, research on effect of SRT of 8, 10, 12 and 15 d on biological nutrient removal was done,and simulation and optimization with the established A2/O model were made.The results indicated that COD and nitrogen removals were rarely influenced by SRT,with the removal efficiency of 80-88% and 57-65% respectively,while P release and uptake of PAOs were largely affected by sludge age.Premoval efficiency was the best at the SRT 12 d and the effluent concentrations could comply with the first class discharge standard of pollutants for municipal wastewater treatment plant.The simulated values for COD,NH3-N and P in three reactors were close to the measured values.Due to practically being limited by model structure,the difference between the simulated and measured values for NO3^·-N was great at the short SRT,while at the long SRT the simulating precision was above 93%,indicating that the established model could satisfactorily simulate the process operation. After analysing the optimizing result the optimal SRT was 13 d,which approached to the experimental resets.