SPECIFICATION This is a design of work & wastewater treatment plant, mainly including work design & wastewater treatment plant design for Chang Sha City. The population density of design and the wastewater discharge Quota is 200L/(cap•d). The work is all over the city. The design scale of wastewater treatment plant is 40000m3/d. The tank was used as main treatment unit. Every unit of the wastewater treatment plant was designed detailed. Two Horizontal-flow Grit Chamber, Which is by . A2/O tank was laid out in two parallel rows, which hydraulic retention time is hours and the sludge reflux ratio is 100%. Two center inlet Peripheral outlet Radial Sedimentation Tanks were adopted as the Secondary Clarifier which diameter is 24 meters and hydraulic retention time is hours. The effluent disinfected with Liquid Chlorine shall attain to the discharge standard. The sludge will be disposed outwards after sludge thickening and dewatering. The Radial sludge thickening basin,Which diameter is meters. 目录 设计总说明 I SPECIFICATION II 1设计任务及要求 1 1 设计题目为:长沙市岳麓区排水工程设计 1 设计原始资料 1 设计内容 1 设计基本要求 2 英文翻译一篇 2 设计说明书和设计计算书一份 2 绘制图纸 2 2总体设计 3 城镇排水系统的确定 3 城镇污水处理工艺流程的确定 3 确定污水处理工艺流程的原则 3 污水处理方案的确定 3 主要构筑物的选择 7 3管网设计 11 排水系统体制的确定 11 污水管道的布置 11 污水管道的设计流量计算 11 污水管网设计 11 污水管道的水力计算 15 雨水管网设计 18 4城市污水处理厂的设计 21 城市污水的组成与水质特征 21 城市污水处理厂设计水质 21 城市污水处理厂厂址的选择 22 污水处理工艺的选定 22 污水处理工艺的选定依据因素 22 污水处理厂相关构筑物及反应装置的设计 22 格栅的设计 23 沉砂池的设计 26