毕业论文（设计）长沙市岳麓区城区排水管网和污水处理厂设计_精品.doc

设计总说明 本设计为长沙市岳麓区城区排水管网和污水处理厂设计。设计人口 16万，污水量标准为200L/（cap.d），污水管网遍布整个城区。污水处理厂设计规模约为4.0万m3/d，主体处理工艺采用普通曝气池活性污泥法。 设计对市政排水管网采取分流制排水方式，生活污水和工业污水通过污水管道进入污水处理厂进行处理后排入河流，雨水经雨水管网收集后直接排放河流。 设计中对污水处理厂进行了详细设计。设计中选用一组平流沉砂池，长宽为6.0m×1.46m；两组辐流沉淀池，直径20.0m；两组活性污泥反应池，长宽为33.0m×30.0m；总水力停留时间8.39h，污泥回流比100%；二沉池为两组中心进水、周边出水的辐流式沉淀池，直径24m，沉淀时间2.5h；出水经液氯消毒后达标排放；污泥经浓缩脱水后外运处置，辐流式浓缩池直径10.5m。 设计成果由说明书、计算书和图纸组成。 SPECIFICATION This is a design of sewer network wastewater treatment plant, mainly including sewer network design wastewater treatment plant design for Chang Sha City. The population density of design and the wastewater discharge Quota is 200L/(cap?d). The sewer network 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 6.0m by 1.46m. A2/O tank was laid out in two parallel rows, which hydraulic retention time is 8.39 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 2.5 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 10.5 meters. 目录 设计总说明 I SPECIFICATION II 1设计任务及要求 1 1.1设计任务 1 1.1.1 设计题目为：长沙市岳麓区排水工程设计 1 1.1.2 设计原始资料 1 1.1.3 设计内容 1 1.2 设计基本要求 2 1.2.1 英文翻译一篇 2 1.2.2 设计说明书和设计计算书一份 2 1.2.3 绘制图纸 2 2总体设计 3 2.1 城镇排水系统的确定 3 2.2 城镇污水处理工艺流程的确定 3 2.2.1 确定污水处理工艺流程的原则 3 2.2.2 污水处理方案的确定 3 2.2.3 主要构筑物的选择 7 3管网设计 11 3.1 排水系统体制的确定 11 3.2 污水管道的布置 11 3.3 污水管道的设计流量计算 11 3.4 污水管网设计 11 3.5 污水管道的水力计算 15 3.6 雨水管网设计 18 4城市污水处理厂的设计 21 4.1 城市污水的组成与水质特征 21 4.2 城市污水处理厂设计水质 21 4.3 城市污水处理厂厂址的选择 22 4.4 污水处理工艺的选定 22 4.4.1 污水处理工艺的选定依据因素 22 4.5 污水处理厂相关构筑物及反应装置的设计 22 4.5.1 格栅的设计 23 4.5.2 沉砂池的设计 26 4.5.3 沉淀池的设计