基于ASM3的污水处理CASS工艺模型建立与参数优化研究

发布时间：2018-08-31 17:59

【摘要】：随着我国对环境保护问题越来越重视,环保基础设施的建设投资力度不断加大,污水厂的普及率显著提高。但这些水厂大多分散管理,缺少科学的运行诊断系统,遇到水质冲击也没有必要的实时监测和分析技术。哈尔滨松花江流域的水厂就面临着随时可能提高水质标准、缺少集群管理的软件平台、随着生活方式转变而导致的低C/N等问题。所以本文针对以上问题,基于ASM3模型建立了一个针对CASS工艺的能够准确快速预测和分析污染物削减量的扩展E-ASM3数学模型。然后借助此模型和正交试验法结合能耗分析共同确定CASS工艺处理低C/N废水的污染物最优削减工况点。本文基于ASM3模型,引入SMP、EPS的概念,加入新组分SSMP(包含SUAP和SBAP)、XEPS,新反应过程SSMP的贮存等;动力学表达式依照“同时贮存与生长”理论引入参数f STO来控制基质用于贮存的比例,引入开关函数+来反映基质何时进入匮乏期;针对CASS工艺建立了两段式的物料守恒。建立扩展E-ASM3模型,并借助MATLAB/Simulink模块化工具搭建了可视化模拟程序。建立的模型经过灵敏度分析,针对出水水质影响较大的参数YSTO.O、b H.O、YSTO.H.O、b A.O、μA、YA、k BAP.O、k H.EPS、f EPS.STO进行了调整,使其静态模拟实验室小试装置出水平均误差为0.57%。在考虑了温度修正后,对水厂实测出水COD、NH3-N和TN进行稳态模拟,结果平均误差分别为7.4%、29.05%和11.02%,除去部分离散值,模拟值基本趋势符合水厂实测值。通过模型模拟四个工艺参数对CASS工艺在处理低C/N废水时的影响。结果显示,COD和氨氮的去除率都随充水比的增加有所降低,曝气时间在大于等于3h后对出水影响不大,污泥回流比对氨氮去除率影响较大,出水SMP浓度规律与COD相关,而EPS则与SMP相反。正交试验极差分析结果显示充水比对于不同C/N废水和不同出水指标λ=0.25都是最优条件;曝气时间从经济角度考虑3 h(空1)出水仍可效果良好;回流比和反应区比例对于COD的去除率分别选择50%和5:30为最优,而对于其他出水指标100%和7:28为最优。结合能耗分析和模拟规律最终确定综合最优点为充水比0.25、曝气时间3 h(空1)、污泥回流比为75%、反应区比例为1:7:28,并提出针对性的优化建议。
[Abstract]:With more and more attention paid to environmental protection in our country, the investment of environmental protection infrastructure is increasing, and the popularization rate of wastewater treatment plants has increased significantly. However, most of these water plants are decentralized management, lack of scientific operating diagnosis system, and there is no necessary real-time monitoring and analysis technology in the water quality impact. Harbin Songhua River Waterworks is faced with problems such as improving water quality standards at any time lack of software platform for cluster management and low C / N caused by lifestyle changes. Therefore, based on the ASM3 model, an extended E-ASM3 mathematical model for accurate and fast prediction and analysis of pollutant reduction in CASS process is established in this paper. Based on the model and orthogonal test combined with energy consumption analysis, the optimal reduction point of pollutants in CASS process for treatment of low C / N wastewater was determined. Based on the ASM3 model, the concept of SMP,EPS is introduced, a new component of SSMP (including SUAP and SBAP) is added, the storage of SSMP in the new reaction process, and so on, the kinetic expression introduces the parameter f STO according to the theory of "simultaneous storage and growth" to control the proportion of matrix used for storage. The switching function is introduced to reflect when the matrix enters the shortage period, and the two-stage material conservation is established for the CASS process. The extended E-ASM3 model is established, and the visual simulation program is built with the help of MATLAB/Simulink modularization tool. Through sensitivity analysis, the model was adjusted to the parameters YSTO.O,b H.OOYSTO.H.OBA.O, 渭 Aneyak BAP.O,k H.EPSF EPS.STO, and the average effluent error of the static simulation laboratory test unit was 0.57. After considering the temperature correction, the steady state simulation of COD,NH3-N and TN is carried out. The average error is 7.4% 29.05% and 11.02%, respectively. The basic trend of simulation value accords with the measured value of water plant. The effects of four process parameters on the treatment of low C / N wastewater by CASS process were simulated by the model. The results showed that the removal rates of COD and NH3-N decreased with the increase of water filling ratio. After aeration time was greater than or equal to 3 h, the removal rate of NH3-N was not affected, and the ratio of sludge reflux had a great effect on the removal rate of NH3-N. The SMP concentration of effluent was related to COD. EPS is the opposite of SMP. The results of orthogonal test showed that the filling ratio was the best condition for different C / N wastewater and different effluent index 位 ~ (0.25), and the aeration time was good when considering 3 h (empty 1) effluent from an economic point of view. The optimal removal rate of COD was 50% and 5:30 for reflux ratio and reaction zone ratio, and 100% and 7:28 for other effluent indexes respectively. Combined with the energy consumption analysis and simulation law, it was finally determined that the comprehensive advantages were water filling ratio of 0.25, aeration time of 3 h (empty 1), sludge reflux ratio of 75 and reaction zone ratio of 1: 7: 28, and put forward some suggestions for optimization.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703

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