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设计总说明：本设计的主要任务是根据该城市污水的水质、处理要求以及排污规模来完成污水处理厂方案的总体设计、总体布局、厂区管道布置、厂区道路及绿化设计；完成污水处理厂总平面及高程设计图。其中本次设计需要完成设计说明书一份、污水处理厂总平面图一张、污水处理工艺流程图一张和高程图一张，以及主要构筑物例如：泵房、SBR反应池、接触消毒池及污泥浓缩池的平面图、剖面图及部分大图样。35320
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本次设计污水处理量为4.5万吨/天。本次设计污水处理厂的进水水质按如下考虑：CODcr：~210mg/L，BOD5：~110mg/L，SS：~200mg/L，NH3-N：~30mg/L，P=3mg/L。污水处理厂处理后的出水执行《城镇污水处理厂污染物排放标准》（GB 18918－2002）中一级B标准，出水水质为：CODcr：≤60mg/L，BOD5：≤20mg/L，SS：≤20mg/L，NH3-N：≤15mg/L，pH:6~9，P：≤1mg/L。
为了能够要达到脱氮除磷的要求，污水处理厂设计的污水处理流程为：污水由市政排水管网排出。流经中格栅以后，由污水提升泵房抽取，再通过泵后细格栅，进水到曝气沉砂池中。之后污水进入配水井中，并由配水井排入到具有脱氮除磷功能的5个SBR反应池中。处理后的污水，会进入接触消毒池。消毒池是能够消除水中绝大部分的细菌和微生物的。最后污水由排水管渠排出。污泥处理的流程则为：从SBR反应池排出的剩余污泥会被排入到集泥井之中。再通过集泥井向两个污泥浓缩池中排放污泥。经过连续重力污泥浓缩后，污泥进入污泥脱水机房进行脱水。脱水后的泥饼会被外运至垃圾填埋场进行填埋处理。
本次论文的设计原则为：（1）为了使员工的生生活起居能够方便，污水处理厂中处理区的位置应力求合理，而且应与生活区尽量分隔开来；（2）处理构筑物按工艺处理流程布置的同时，应该充分利用地形；（3）构筑物与构筑物之间的距离应当满足管道的铺设，还有能够满足检修时，人员和车辆的进入；（4）因为处理厂存在事故和检修，所以超越管线是工艺流程中必不可少的存在；（5）污泥处理区会产生臭，鼓风机房会产生噪音，应该合理布置它们的位置来尽量避免或减少对周围居民的影响。（6）在各个构筑物外侧设置安全通道，方便工作人员查看，满足物品运输和日常操作管理的需要。
毕业论文关键词：SBR工艺；生活污水；污泥
City sewage process design in a given area
General Design Description: The main task of the design is based on the water quality of the city sewage treatment requirements and scale to complete the overall design of the sewage treatment plant sewage scheme, the overall layout of the plant piping, plant roads and green design; the completion of sewage treatment plant general layout and elevation design FIG. The design needs to be done where the design specification of a sewage treatment plant in an overall plan, a sewage treatment process flow diagram and an elevation map, and major structures such as: pumping stations, SBR reaction tank, the contact disinfection tank and sludge thickener plans, sections and some large drawings.
The design of the sewage treatment capacity of 45,000 tons / day. The design of the water quality of sewage treatment plants by the following considerations: CODcr: ~ 210mg / L, BOD5: ~ 110mg / L, SS: ~ 200mg / L, NH3-N: ~ 30mg / L, P = 3mg / L. Water execute "Municipal Wastewater Treatment Plant Pollutant Emission Standards" (GB 18918-2002) sewage treatment plant in level B standard, water quality is: CODcr: ≤60mg / L, BOD5: ≤20mg / L, SS: ≤20mg / L, NH3-N: ≤15mg / L, pH: 6 ~ 9, P: ≤1mg / L.
To be able to achieve the requirements of nitrogen and phosphorus removal, sewage treatment plants sewage treatment process: sewage discharged from the municipal sewer network. After flowing through the grid, drawn by the sewage pumping station, and then through the pump fine grid, water to aerated grit pool. After entering with sewage wells, with wells discharged by nitrogen and phosphorus removal function having five SBR reaction pool. Treated effluent will be brought into contact with disinfectant pool. Disinfect pool water is able to eliminate most of the bacteria and microorganisms. Last sewage discharged from the sewerage. Sludge treatment process was: SBR reactor is discharged from the sludge will be discharged into the mud into the well. Then discharged sludge to sludge thickening tank through two sets of mud wells. After continuous gravity sludge thickening, sludge into sludge dewatering room for dehydration. Dewatered sludge cake will be Sinotrans to landfill landfill.
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