【作者】 商敏儿；

【导师】 杜树新；

【作者基本信息】 浙江大学 ， 模式识别与智能系统， 2002， 硕士

【摘要】 活性污泥法污水处理是利用自然界中微生物的生命活动来清除污水中有机污染物的一种有效方法，是当前世界上处理工业有机污水和城市生活污水的主要途径。活性污泥法是一个生物过程，机理复杂；并且具有很大的时变性，需要较多地考虑其动态行为和运行特性。为了实现对污水处理过程工艺和处理效果的预测，污水处理过程的仿真模拟显得非常重要。 本文主要内容包括： 1．综述了污水处理过程现有的模型、介绍了国外已有的仿真软件；论述了自动控制所面临的困难、研究现状以及发展方向。 2．根据活性污泥法污水处理的工艺流程和机理特点，设计并开发了以国际水质协会提出的数学模型ASM1为核心的活性污泥法污水处理过程仿真器MASS，对该软件的结构和功能进行了介绍。由该仿真软件，通过不同的生化池组态，可以模拟各类生物污水处理过程，从而预测所采纳工艺的污水处理效果，从而为污水处理工艺设计提供指导。 3．通过对不同输入时MASS仿真器输出的分析说明了该仿真器的可靠性及实用性。同时，运用MASS对污泥回流比例控制、污泥停留时间控制、DO浓度PID控制及DO浓度模糊控制等进行了仿真，分析了不同控制方案的效果。并且指出：①污泥回流定比例控制不能有效地抑制由于进水水量波动而导致的出水水质波动。②对污泥排放量进行控制可以降低出水的底物浓度、减少出水水质波动。③针对进水的波动，为使出水水质达到排放标准，对进水流量控制十分重要。④在污水处理系统中，DO浓度控制可以实行有效的节能。这些结论对污水处理过程控制系统的设计具有重要的指导作用。 4．针对一个实际的污水处理厂提出了基于PLC的自动控制系统的具体实现。阐述了该控制系统的主要功能、指导思想和基本概况。对PLC程序设计进行了说明。更多还原

【Abstract】 Activated sludge process, which consumes the substrates in wastewater by microorganism metabolism, has been extensively utilized for the secondary treatment of industrial and municipal wastewater. The activated sludge process is a biological one, which has characteristic of complicated mechanism non-linear and time varying. It is especially essential to predict the results of treatment by simulation. Many researchers recognize the importance of mathematics simulation and there are some integrated software simulating the whole wastewater treatment process aboard, but it is still blank in China. This thesis develops a activated sludge process simulator (MASS) based on the IAWQ model, which successfully estimates the efficiency of the controllers and helps to design the control system of a real plant. The main content of this paper is as follows: 1. The development of modeling in activated sludge process and several simulation software in this field are reviewed. Then the problems faced in automation of wastewater treatment process and the present situations of research in literatures are descrobed. 2. The structure and function of the MASS. which was based on ASMI and designed by the development tool Matlab, are discussed in detail. 3. The reliability and utility of MASS are shown by analyzing the effluents in different input conditions. The control strategies, such as rate control of return sludge, PD control and fuzzy control of DO, are simulated in MASS. It can be concluded that: ORate control of the return sludge can not efficiently reduce the fluctuation of effluent caused by the fluctuation of influent. ontrol of the wastage sludge is effective in increasing the quality of the effluent. nfluent control is the key in reducing the effluent fluctuation. () DO control is necessary in cost reduction. 4. An control system project about a wastewater treatment plant based in PLC is introduced. First, it shows the function and configuration of the control system and the reasons. Secondly, PLC programming is depicted in detail.更多还原