【作者】 张琪；

【导师】 张贝克；

【作者基本信息】 北京化工大学 ， 控制科学与工程， 2015， 硕士

【摘要】 计算机仿真技术是研究活性污泥法污水处理系统的有效方式。活性污泥1号模型(ASM1)由国际水协发布,并在国内外都得到了广泛的应用。因此,本文以ASM1为基础,利用计算机仿真技术展开研究。首先,本文以ASM1模型为基础对象,加入除磷相关过程,建立了集除碳、脱氮、除磷功能为一体的IASM1模型(Improvement of Activated Sludge Model No.1)。并用欧盟科学技术合作组织发布的污水处理仿真基准模型BSM1 (Benchmark Simulation Model No.1)和国际水协发布的ASM2d(Activated Sludge Model No.2d)分别对IASM1模型的除碳脱氮过程和除磷过程进行稳态验证。此外,利用北京和西安两个污水处理厂2014年11月1日至30日的进、出水水质监测数据对IASM1模型进行动态验证。其次,为了提高模型整体精确性,本文采用支持向量机法(SVM)对IASM1模型的参数进行参数优化。由于IASM1模型有40个参数,为了提高优化效率,因此,先利用相对灵敏度分析法找出对IASM1模型整体精确性影响较大的4个参数(YH、μA、KH、bH)。对这4个参数进行参数优化即可有效提高模型整体精确性。再次,通过IASM1模型对污水处理厂进行控制策略的设计。其中鼓风机曝气系统是污水处理厂耗电量最大的系统,占污水处理厂总耗电量的50%-60%。为了降低污水处理厂的能耗,本文针对曝气系统,提出了一个鼓风机曝气系统的简单自适应控制策略：由操纵变量补偿器与曝气池DO浓度控制系统组成,鼓风机采用变频调速进行控制。其中,操纵变量为鼓风机转速。可大大降低耗电量与运行成本。最后,在上面三部分内容的基础上,基于面向对象的思想,利用UML语言对软件进行设计。根据设计思路,采用C++编程语言基于VS2010仿真平台开发出一款污水处理仿真软件,利用Quest 3d作为三维展示平台,使得污水处理流程可实时展示。该软件可作为被控对象与外部控制器相连,也可作为学生及污水处理相关从业人员的学习工具。更多还原

【Abstract】 Computer simulation technology is an effective method in the research of the activated sludge process for sewage treatment system. The activated sludge models released by IWA (International Water Association) have found wide applications at home and abroad. Thus, this paper is on the basis of ASM1, and its study employs computer simulation technology.First, in order to take the phosphorus removal related processes into account as well, this paper puts forward the IASM1 (Improvement of Activated Sludge Model No.1) on the basis of ASM1, which combines the functions of carbon removal, nitrogen removal and phosphorus removal. Meanwhile, the proposed IASM1 is certified with BSM1 (Benchmark Simulation Model No.1) released by COST (European Co-operation in the field of Scientific and Technical Research) and ASM2d released by IWA with respect to the steady state of the carbon and nitrogen removal process and the phosphorus removal process, respectively. Furthermore, using the practical influent and effluent data of two sewage treatment plants in Beijing and Xi’an from November lth to November 30th in 2014, the proposed one is verified with respect to its dynamic process.Second, to improve the overall accuracy of the proposed model, the parameters of the proposed IASM1 are optimized by SVM method. Since the number of the proposed IASM1 parameter is as large as 40, to enhance the optimization efficiency, four parameters (YH、μA、KH、bH) having relatively greater influence on overall accuracy of the proposed IASM1 are found using relative sensitivity analysis method. Then, the overall accuracy of the proposed model can be effectively improved after optimizing these four parameters presented above.Third, the control strategy of the sewage treatment plant is designed based on IASM1. As the most power-consuming systems in a sewage treatment plant, a blower aeration system accounts for 50%-60% of the total power consumption of a sewage treatment plant. To reduce the power consumption in a sewage treatment plant, a simple adaptive control strategy for the blower aeration system is presented in this paper. It consists of a manipulated variable compensator and a aerobic tank DO concentration control system, in which the blower employs frequency control. And the manipulated variable is the rotate speed of blower. This control strategy can significantly reduce the power consumption and operating cost.Finally, on the basis of these three researches presented above, its software is designed based on the object-oriented concept and utilizing UML language. Following this design method, an application software utilizing C++ language and based on VS2010 platform is developed. Simultaneously, using Quest 3d as the three-dimensional display software, the sewage treatment process can be displayed in real time. This software can be connected with external controllers acting as the controlled object. Besides, it can be the learning tool for students and professionals related to sewage treatment.更多还原