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1、天水市污水处理厂工程工艺设计给水排水工程专业毕业设计摘 要本设计为天水市污水处理厂工程工艺设计，污水处理厂处理规模为一期40000m3/d。污水主要来源为生活污水和工业废水，主要污染物质为NH3-N、BOD、COD，适宜采用生化处理方法。经过方案比较，确定采用三沟式氧化沟工艺。NH3-N、BOD、COD的去除率分别达到92%、93%、89%，污水处理厂处理后的出水达到污水综合排放标准（GB8978-1996）中的二级标准。污水和活性污泥的混合液在氧化沟中进行不断的循环运动，具有良好的去除BOD、COD及脱氮除磷的功能。另外，工艺流程简单，构筑物少，构造形式多样，运行较为灵活，运行稳定性好，基建
2、投资省，运行费用低，操作管理方便，出水水质好也是氧化沟优于其他处理工艺的地方。关键词：三沟式氧化沟、脱氮除磷AbstractThis design is about the sewage treatment plant in tianshui City. The construction of this plant is 40000 m3/d. The main origin of the sewage is the sanitary sewage and the industrial waste. The main polluting is the NH3-N, BOD, COD. It i
3、s suitable to use the biochemistry processing method. After the comparison of the plan, the Three Type Oxidation Ditch craft was chosen as the process. The elimination rate of the NH3-N, BOD, COD respectively achieved 92%, 93%, 89%. The outlet water of the treatment meets the level two of the Nation
4、al Sewage Discharge Standard (GB8978-1996).The mixed liquor of the sewage and the activated sludge are sporting unceasingly in the oxidation ditch. It is good to exclude BOD、COD and take off the nitrogen and the phosphorus. Additionally, the simple processing, the few buildings, the varied structure
5、, the nimble movement, and the good stability of the movement, the province initial cost, the low operating cost, the convenient operation and management, the good quality of the letout water are also the places which the oxidize ditch is better than the other technology.Key words : three oxidation
6、. nitrogen and phosphorus removal目录第一章 概述-51.1 城市污水的特征及建造城市污水处理厂的必要性-51.2我国水处理技术的发展-51.3 设计任务及内容-6第二章 污水厂设计方案的确定-92.1 方案初选-92.1.1 活性污泥法的特征-92.1.2 生物膜法的特征-102.2 方案比选-112.3 方案确定-12第三章 污水厂构筑物设计计算-163.1 粗格栅计算-163.2污水提升泵房-203.2.1设计参数-203.2.2泵房设计计算-203.3.细格栅计算-223.4平流沉砂池计算-253.5配水井-293.6 三沟式氧化沟计算-303.7 接触池计算-373.8 污泥泵房计算-403.9污泥浓缩池-413.10 贮泥池计算-443.11 脱水机房计算-45第四章 污水处理厂高程及平面设计-454.1高程布置-464.1.1污水高程计算-464.1.2 中水、污泥高程-484.2平面布置-494.2.1平面布置的一般原则-494.2.2污水厂布置形式-504.2.3污水长布置的具体内容-50第五章 中水处理构筑物设计计算-505.1中水处理工艺流程-505.2隔板式絮凝池-
