【作者】 张园园；

【导师】 彭党聪；

【作者基本信息】 西安建筑科技大学 ， 环境工程， 2008， 硕士

【摘要】 本文在国际水协会活性污泥2号模型(ASM2)和二沉池Takacs分层沉淀模型的基础上构建了活性污泥系统综合模型。在WindowsXP操作系统上，采用VisualBasic 6．0语言编写了活性污泥系统模拟程序，并应用欧盟模拟基准(COSTSimulation Benchmark)对其进行检验，最后应用模拟程序对西安市邓家村污水处理厂进行了模拟分析。在模拟程序编制的过程中对操作界面、数据输入和输出、数据库、计算方法和积分步长等具体问题进行了分析，通过基准校验，证明所编写的模拟程序在计算精度、运行速度和数据管理等方面可满足实用要求。应用所编写的模拟程序对西安市邓家村污水处理厂Johannesburg工艺进行了模拟，分析现有进水水质和工艺条件下系统的微生物量及出水水质。进一步分析了进水分配比、污泥回流比、混合液回流比、污泥龄、反应器体积分配比等参数对Johannesburg工艺脱氮效果的影响。结果表明：(1)进水分配比的改变可以影响进入厌氧池的硝酸盐浓度及快速生物降解COD的含量，从而对系统除磷效果影响很大；但进水分配比的改变对系统脱氮效果影响不大；(2)系统脱氮效率随着混合液回流比的增大而增大。当混合液回流比超过150％时，再继续提高混合液回流比对系统出水硝氮几乎没有影响，将实际工艺混合液回流比为125％，将其增大到150％，总氮去除率仅提高3．5％；(3)随着污泥回流比的增加(从30％增加到100％)，出水总氮，氨氮，硝氮浓度逐渐减小，出水总磷、磷酸浓度逐渐增加，出水中的TCOD、SS浓度也逐渐增加，改变污泥回流比比不能有效的提高系统脱氮效果；(4)污泥龄大于12天便可满足工艺出水要求。实际工艺系统污泥龄为15天，继续增大污泥龄系统脱氮率基本上保持不变，所以改变污泥龄也不能有效的提高系统脱氮效果；(5)当缺氧区与好氧区的比例由原来1：14．7调整为1：2．3时，反硝化进行的更彻底，缺氧池出水硝氮浓度由3．1mg/l减少为0．04mg/l，TN去除率提高了25．7％，出水总氮浓度变得更低。通过对缺氧区与好氧区体积比的改变可以很好的提高系统脱氮效果。更多还原

【Abstract】 On the basis of the activated sludge NO.2 and the Takàcs settling model, a simulation program for the wastewater treatment process with Visual Basic 6.0 under Windows XP operation system was constructed. The simulation program was adjusted by the COST simulation benchmark and then was used to simulate and analyse municipal wastewater treatment process in Dengjiacun, Xi’an.The user’s interface, access database, data input and output, calculation method and integral steps were discussed for the program development. The results showed that the calculation precision, run velocity and data management in the program can fit the requirement of application.The software was used to simulate the Johannesburg process and analyse the biomass, nitrogen and phosphorus in effluent during the sludge-cultivating. Furthermore, the thesis had predicted the effluent quality under different operation and control conditions such as influent distribution ratio, mixed liquor recycling ratio, activated sludge circulation ratio, SRT and volume ratio between anoxic and oxic zone in the model. The main conclusions are summarized as follows:（1） The change of the influent distribution ratio affected the concentration of NO₃-N and COD in the anaerobic zone which had a great impact on the efficiency of the biological phosphorus removal in the system. But the change of the influent distribution ratio was of no effect on the efficiency of the biological nitrogen removal;（2） Nitrogen removal can be enhanced by increasing the mixed liquor recycling ratio. When the mixed liquor recycling ratio was higher than 150%, the NO₃-N in effluent was hardly changed. The efficiency of the biological total nitrogen removal increased by 3.5% when the mixed liquor recycling ratio increased from 125% to 150%;（3） With the increasement of the activated sludge circulation ratio （ranging from 30% to 100%）, the effluent quality changed as follows: the concentration of TN, NH₃-N, NO₃-N induced while the concentration of TP, PO₄^2-, TCOD and SS increased. And the activated sludge circulation ratio can not enhance the efficiency of the biological nitrogen removal effectively;（4） The concentration of COD, TP, TN and ammonia-nirtogen in effluent satisfied all requirements when the SRT is controlled in 12d. The SRT in the actual process is 15d and the efficiency of the biological total nitrogen removal remained steady when it was more than 15 days;（5） When the volume ratio between anoxic and oxic zone changes from 1:14.7 to 1:2.3, NO₃-N in the anoxic zone decreases from 3.1 mg/l to 0.04mg/l and the efficiency of the total nitrogen removal increased by 25.7%. It showed that the volume ration between anoxic and oxic zone has a tremendous effect on the nitrogen removal process.更多还原