安徽滁州第二污水处理厂工艺研究及工程应用

发布时间：2018-05-03 05:03

本文选题：城市污水 + 工艺研究　；参考：《兰州交通大学》2015年硕士论文

【摘要】：本课题主要分析安徽滁州市第二污水处理进水水质水量及指标特性,目的是通过研究水质并对其分析论证,运行先进的计算机流场模拟技术进行工程分析,为该处理厂找到适合的处理工艺,在污水处理工艺研究及计算机工程设计应用领域起到一定参考作用及示范作用,为滁州水环境治理起到良好意义。本次项目研究的内容主要有四个方面:1、针对污水水质及水质要求,系统分析确定了核心工艺;2、应用三维模型,对氧化沟进行了流场动态模拟;3、进行系统的工艺工程设计,并对工程投入运行后的现场取样分析,验证设计参数及设计的合理性等;4、对工程进行经济分析。论文针对以上四个研究内容进行了研究论述,主要得到了以下研究成果:1.污水处理厂设计总规模确定为15万m3/d,其中一期工程为5万m3/d;预测进水水质为CODcr400mg/L,BOD5200mg/L,SS 250mg/L,TN 40mg/L,NH3-N 35mg/L,TP3mg/L。经过分析比较,本课题污水处理采用改良型脱氮除磷氧化沟生物处理工艺(即改良型氧化沟工艺),经处理后出水水质标准符合《(GB18918-2002)城镇污水处理厂污染物排放标准》(一级B)标准;污泥浓缩脱水干化至含水率低于50%后外运处置。2.设计污水二级处理部分采用了改良型脱氮除磷氧化沟污水处理工艺,该法是在普通卡鲁塞尔氧化沟前增加一个厌氧区和一个缺氧区,并在厌氧缺氧区设置了多点进水,形成了一个具有良好除磷脱氮效果的污水处理工艺,它综合了A2/O法和氧化沟法的优点,具有出水水质好、不易发生污泥膨胀、除磷脱氮效率高、抗冲击负荷能力强、能耗省、污泥易稳定、便于自动化控制等优点。研究中运用建立三维模型,对氧化沟进行了流场动态模拟,验证得出设计改良型氧化沟沟型尺寸设计合理,沟内平均流速0.36m/s,能够形成完全混合效果,并且对设备运行方式提出建议,是一次计算机流体模拟软件技术与污水处理工艺的成功实践。3.设计污水系统采用“预处理(粗细格栅用+曝气沉砂池)+改良型氧化沟+周进周边辐流式沉淀池+紫外消毒”的工艺,该系统技术路线成熟,脱氮除磷效果好,运行稳定,节约成本等特点。设计污泥处理部分采用污泥一体化机械浓缩脱水处理工艺,该方法工艺流程短,系统自动化程度高;占地面积小,无需新增占地和土建;设备简洁、安全可靠;投资少,运行费用低。4.该项目总投资9710.94万元,单位水量经营成本0.62元/m3。5.项目于2013年建成通车并投入试运行,2013年统计数据实测进水均值CODcr280mg/L,BOD5140mg/L,SS 230mg/L,TN 28mg/L,NH3-N 35mg/L,TP 2.3mg/L。数值接近设计指标,设计出水完全达标。处理效果良好,改良型氧化沟运行效果稳定,是一次成功的工程设计实践。
[Abstract]:The main purpose of this project is to analyze the water quality, quantity and index characteristics of the second sewage treatment in Chuzhou, Anhui Province. The purpose of this paper is to run advanced computer flow field simulation technology for engineering analysis by studying water quality and analyzing and demonstrating it. Finding a suitable treatment process for the treatment plant plays a certain reference and demonstration role in the research of sewage treatment process and the application of computer engineering design, and plays a good role in the treatment of water environment in Chuzhou. The contents of this project are mainly four aspects: 1. According to the water quality and water quality requirements, the core process is analyzed and determined systematically. The oxidation ditch is simulated dynamically by using the three-dimensional model, and the systematic process engineering design is carried out. After the project is put into operation, the field sampling analysis, the verification of the design parameters and the rationality of the design are made, and the economic analysis of the project is carried out. The thesis has carried on the research discussion to the above four research contents, has obtained the following research result mainly: 1. The total design size of the wastewater treatment plant was determined to be 150000 m3 / d, and the first stage of the project was 50 m3 / d; the predicted influent quality was CODCR 400mg / L Bod 5200 mg / L SSS 250 mg / L TN 40 mg / L NH _ 3-N 35 mg L / L / T TP3 mg / L. Through analysis and comparison, the improved biological treatment process of nitrogen and phosphorus removal oxidation ditch (improved oxidation ditch process) is adopted in this project. After treatment, the effluent quality standard conforms to the standard of pollutant discharge (Grade B) of the Municipal sewage treatment Plant (GB18918-2002). Sludge concentration, dehydration, drying to less than 50% moisture content, then transport treatment. 2. 2. In the design of the secondary treatment of wastewater, the improved process of nitrogen and phosphorus removal oxidation ditch wastewater treatment was adopted. In this method, an anaerobic zone and an anoxic zone were added in front of the common Carrousel oxidation ditch, and a multi-point influent was installed in the anaerobic anoxic zone. A wastewater treatment process with good effect of phosphorus and nitrogen removal is formed. It combines the advantages of A 2 / O process and oxidation ditch process. It has the advantages of good effluent quality, easy sludge bulking, high efficiency of phosphorus removal and nitrogen removal, strong impact load resistance, and low energy consumption. Sludge is easy to stabilize and easy to control automatically. In the study, a three-dimensional model was established to simulate the flow field of the oxidation ditch. The results show that the design of the modified oxidation ditch is reasonable, and the average velocity of flow in the ditch is 0.36 m / s, which can form a complete mixing effect. It is a successful practice of computer fluid simulation software technology and sewage treatment process. The process of "pre-treatment (aeration sand settling tank for thick and fine grille) improved ultraviolet disinfection of peripheral radial flow sedimentation tank of oxidation ditch" was designed. The technical route of the system is mature, the effect of nitrogen and phosphorus removal is good, and the operation is stable. Cost saving and other characteristics. The sludge treatment part is designed with sludge integrated mechanical thickening and dewatering process. The process flow is short, the system automation is high, the area is small, no new occupation and civil construction is needed, the equipment is simple, safe and reliable, and the investment is less. Low operating cost. The total investment of the project is 97.1094 million yuan, and the operating cost per unit water amount is 0.62 yuan / m ~ (3.5). The project was completed and put into trial operation in 2013. The statistical data measured in 2013 were CODcr280 mg / L BOD5140 mg / L SS 230 mg / L TN 28 mg / L N 35 mg / LTP 2.3 mg / L. The value is close to the design index and the design water is up to the standard. The treatment effect is good and the operation effect of improved oxidation ditch is stable. It is a successful engineering design practice.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703

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