基于ASM1的脱氮除磷数学模型的建立

Modeling of nitrogen and phosphorus removal on the basis of ASM1

ASM1模型(Activated Sludge Model No.1)是国际水协在1987年推出的第一个系统的活性污泥数学模型,由于其简单而准确地模拟了除碳、脱氮过程,因而它在污水处理厂中得到广泛应用。本文在ASM1模型的基础上加入除磷过程,建立了DASM1模型(Development of Activated Sludge Model No.1)。利用欧盟科学技术合作组织推出的BSM1模型(Benchmark Simulation Model No.1)验证了它的稳态除碳、脱氮过程;同时,利用国际水协推出的ASM2d模型(Activated Sludge Model No.2d)验证了它的稳态除磷过程。其验证结果表明:DASM1模型能够较准确地模拟污水处理厂的稳态过程。此外,利用北京、西安两个污水处理厂的实际进、出水数据对DASM1模型进行动态验证。其验证结果表明:DASM1模型能够较准确地模拟污水处理厂的动态过程。DASM1模型的稳态平均误差和动态平均误差均在可接受范围之内,因此它能够较准确地模拟污水处理厂的实际运行过程。

As the first systematic activated sludge models released by IWA （International Water Association） in 1978, ASM1 have found wide applications in the sewage treatment plants due to its simple and accurate simulation with respect to the carbon and nitrogen removal process. On the basis of ASM1, DASM1 （Development of Activated Sludge Model No.l） which takes the phosphorus removal into account as well is presented in this paper. The proposed model is certified with BSM1 （Benchmark Simulation Model No.l） released by COST（European Co-operation in the field of Scientific and Technical Research） with respect to the steady state of carbon and nitrogen removal process. Meanwhile, it is certified with ASM2d released by IWA with respect to the steady state of the phosphorus removal process. Their verification results suggest that it can accurately simulate the steady-state process of the sewage treatment plants. Furthermore, using the practical influent and effluent data from two sewage treatment plants in Beijing and Xi＇an, the proposed one is verified with respect to its dynamic process. Their verification results suggest that it can accurately simulate the dynamic process of the sewage treatment plants. These verification results suggest that the average errors of both steady state and dynamic state for the proposed one are within acceptable range, and thus it can accurately simulate the practical operating process of a sewage treatment plant.