ASM1模型在污水生物添加强化脱氮的仿真研究

Modeling and Simulation for Bio-augment to Enhance Nitrogen Removal in Municipal Wastewater Treatment

通过定义投加比概念、以及向ASM1模型矩阵中增加新组分Xaa(投加硝化菌)和添加相应的过程方程等方法,对生物添加过程建立数学模型。并针对投加比、泥龄等影响因素,模拟了生物添加强化脱氮的过程。仿真结果显示泥龄仅为6天时,投加比为0.2,硝化菌不到30天就达到稳定,出水氨氮不到15天就接近于零,而投加比为0时,7天后,出水氨氮仍有35mg/L左右;在恒定投加比下,泥龄越长,硝化越好,如投加比为0.01时,泥龄越大,氨氧降解越快,硝化菌浓度越高,当泥龄9.3天时,40天左右,出水氨氮可在2mg/L以下。这些均与实验结果相符,仿真结果表明生物添加法可有效的强化硝化及脱氮,提高投加比可提高主反应器的硝化菌浓度,提高氨氧化速率,在不同泥龄下,投加比对硝化影响不同,加大投加比,可以降低泥龄对硝化的影响。

By defining the concept of dosage ratio,and add new group to the ASM1 matrix of Xaa（adding nitrifying bacteria） and add new dependent equations,the mathematical model of bio-augment process was established.According to the factors of dosage ratio and sludge age,the bio-augment process was simulated to enhance nitrogen removal.The simulation results show nitrifying bacteria in less than 30 days to stabilize and the effluent ammonia less than 15 days fall close to zero as the sludge age is only 6 days and the dosage ratio is 0.2.While the dosage ratio is zero,7 days later,the effluent ammonia is about 35mg/L.At constant dosage ratio condition,the longer of sludge age is,the better of nitrification effect is,as the dosage ratio is 0.01,the sludge age is longer,ammonia oxidation is more quickly,and the concentration of nitrifying bacteria is higher.As the sludge age is 9.3 days,it is 40 days later,the effluent ammonia can be below 2mg/L.These results are consistent with the experimental results.These simulation results show that the bio-augment can enhance the nitrification and nitrogen removal efficiency,and to increase the dosage ratio can improve the nitrifying bacteria concentration and can improve ammonia oxidation rate of main reactor.Under different sludge age,dosage ratio has different effect on nitrification,to increase the dosage ratio,and it can reduce the influence of SRT on nitrification.