摘 要

本次毕业设计所选题目为湖南省岳阳市岳阳楼区东部排水工程设计。设计结合国内外排水工程研究现状及岳阳楼区东部水环境污染情况，完成了设计地区排水管道系统及污水处理厂的设计，进行了排水工程造价估算分析。设计成果对解决设计地区城市污水的收集处理与排放、城市防涝减灾、南湖污染综合治理等问题具有重要现实意义。

排水管网根据城区规划采用完全分流制排水体制。污水根据地形先经干管自东向西顺坡送入主干管，主干管再自南向北顺坡将汇集的污水送入污水处理厂。雨水根据就近排放的原则将城区分为六个汇水区并分别由独立的干管自东向西顺坡排入南湖。于每条雨水干管末，溢流中层的初期雨水，剩余雨水送至污水处理厂，经粗格栅、细格栅、曝气沉砂池及竖流式沉淀池处理后排入南湖。

污水处理厂根据地形及风向定址于岳阳楼区东部的西北方。近期处理规模8600m³/d，远期处理规模12900m³/d。出水水质根据进水水质和受纳水体水质要求采用Ⅰ级A标准。根据进出水水质及处理规模，对污水采用三级处理的方式，核心二级生物处理工艺选择CASS工艺，工艺流程为进水→粗格栅→进水泵房→细格栅→旋流沉砂池→CASS池→深度处理提升泵房→高密度沉淀池→V型滤池→接触消毒池→巴氏计量槽→出水。污泥处理工艺流程为剩余污泥→储泥池→离心浓缩机→板框压滤机→泥饼外运。

根据提供的原始资料，本设计最终成果为完成了岳阳楼区东部排水管道系统、污水处理厂的设计计算，绘制了A1图纸8张，A2图纸一张，并撰写了设计计算书及设计说明书各一份。

关键词：完全分流制排水体制；初雨处理；CASS工艺；污水深度处理

Abstract

The selected subject of this graduation project is the drainage engineering design of the eastern part of Yueyanglou District, Yueyang City, Hunan Province. Combined with the research status of drainage engineering at home and abroad and the water environment pollution in the east of Yueyanglou District, the design of drainage pipeline system and sewage treatment plant in the design area is completed, and the cost of drainage engineering is estimated and analyzed. The design results have important practical significance to solve the problems of collection, treatment and discharge of urban sewage, urban flood prevention and mitigation, comprehensive treatment of South Lake pollution and so on.

According to the urban planning, the drainage network adopts the complete diversion drainage system. According to the terrain, the sewage is first sent to the main pipe from east to west along the slope through the main pipe, and then the collected sewage is sent to the sewage treatment plant from south to north along the slope through the main pipe. According to the principle of nearby drainage, the urban area is divided into six catchment areas and discharged into South Lake from east to west by independent main pipes. At the end of each main rainwater pipe, a regulating and storage tank is set up. The initial rainwater intercepted overflows in the middle layer, and the remaining rainwater is sent to the sewage treatment plant. After being treated by coarse grid, fine grid, aeration grit chamber and vertical flow sedimentation tank, it is discharged into the South Lake.

The sewage-treatment plant is located in the northwest of the east of Yueyanglou District according to the terrain and wind direction. The short-term treatment capacity is 8600 m³/d, and the long-term treatment capacity is 12900 m³/d. According to the requirements of inlet water quality and receiving water quality, the effluent quality shall adopt class I A standard. According to the water quality and treatment scale, three-level treatment is adopted for the sewage. CASS process is selected for the core two-level biological treatment process. The main process is as follows：water inlet → coarse grid → water inlet pump room → fine grid → rotational flow grit chamber → Cass tank → advanced treatment lifting pump room → high-density sedimentation tank → V-shaped filter → contact disinfection tank → Babbitt metering tank → water outlet. The technological process of sludge treatment is as follows: excess sludge → sludge storage tank → centrifugal thickener → plate and frame filter press → mud cake transportation.

According to the original data provided, the final result of this design is to complete the design and calculation of the drainage pipeline system and sewage treatment plant in the east of Yueyanglou District, draw 8 A1 drawings, one A2 drawing, and composed one design calculation sheet and one design specification.

Key Words：Complete diversion drainage system；Initial rain disposal；Cyclic activated sludge system；Sewage depth processing

目 录

第1章 绪论 1

1.1 研究背景 1

1.2 目的及意义 1

1.3 国内外研究现状分析 2

1.3.1 国内外排水管网研究现状分析 2

1.3.2 国内外污水处理研究现状分析 3

1.3.3 国内外初雨处置研究现状分析 5

1.4 设计地区污水及污染情况 5

第2章 设计说明书 7

2.1 设计原始资料 7

2.1.1 工程概况 7

2.1.2 设计任务及进度安排 7

2.1.3 设计采用的主要规范和标准 8

2.2 排水方案设计 9

2.2.1 排水体制选择 9

2.2.2 厂址位置选择 10

2.2.3 污水管网设计 10

2.2.4 雨水管网设计 11

2.2.5 初雨径流收集设计 13

2.3 污水处理设计 14

2.3.1 主体处理工艺选择 14

2.3.2 工艺流程确定 14

2.3.3 污水处理构筑物设计 15

2.4 污水厂附属构筑物 20

2.4.1 面积规划 20

2.4.2 水厂定员 20

2.4.3 附属构筑物 20

2.5 污水处理厂平面布置 21

2.5.1 布置原则 21

2.5.2 平面布置 22

2.6 污水处理厂高程布置 22

2.6.1 布置原则 22

2.6.2 高程布置 23

第3章 设计计算书 24

3.1 水量计算 24

3.2 处理构筑物设计计算 24

3.2.1 泵前粗格栅 24

3.2.2 进水泵房 26

3.2.3 泵后细格栅 28

3.2.4 旋流沉砂池 30

3.2.5 CASS工艺 31

3.2.6 深度处理提升泵房 36

3.2.7 化学除磷及加药间 37

3.2.8 高密度沉淀池 38

3.2.9 V型滤池 43

3.2.10 接触消毒池及加氯间 50

3.2.11 巴氏计量槽 51

3.2.12 配水井 52

3.3 初期雨水处理 53

3.3.1 雨水调蓄池 53

3.3.2 粗格栅 54

3.3.3 初雨泵房 56

3.3.4 细格栅 57

3.3.5 曝气沉砂池 59

3.3.6 竖流式初沉池 60

3.4 污泥处理 62

3.4.1 储泥池 62

3.4.2 离心浓缩机 63

3.4.3 板框压滤机 63

第4章 污水厂附属构筑物设计计算 65

4.1 水厂总体面积规划 65

4.2 水厂定员 65

4.3 水厂各附属构筑物平面面积 66

第5章 污水处理厂总体布置 68

5.1 污水厂平面布置 68

5.2 污水厂高程布置 69

第6章 污水处理厂工程投资估算 78

6.1 污水厂工程投资 78

6.2 远期规划附加投资 78

6.3 污水厂直接费用 78

6.4 污水处理成本估算 78

第7章 总结 81

参考文献 82

附录 84

附表1 污水管网服务面积表 85

附表2 污水管网节点地面标高表 87

附表3 污水管道系统设计流量计算表 88

附表4 污水管道系统水力计算表 95

附表5 雨水管网街坊面积表 105

附表6 雨水管网汇水面积表 107

附表7 雨水管网检查井标高表 114

附表8 雨水管网水力计算表 116

致谢 136

第1章 绪论

1.1 研究背景

随着我国的经济发展方式由高速增长向高质量发展转变，社会的主要矛盾也转变为人民日益增长的美好生活需要和不平衡不充分的发展之间的矛盾，其中城乡居民环保意识普遍觉醒从而对生态文明建设及污染防治工作要求更加严格的现象尤为突出。为了解决这一问题，首当其冲同时与人们日常生活息息相关、举足轻重的就是水环境的治理与保护，这主要是由于在城市化水平不断提高、工业农业快速发展的过程中，大量未经处理的工业废水、生活污水、农业污水及城市污水处理厂尾水等排入受纳水体，积年累月后超过了水环境容量导致水体受到严重污染，极大地影响了生态环境及居民的生活条件。因此完善和发展市政排水工程的建设对深入贯彻绿色可持续的发展理念，提高人民生活水平具有十分重要的意义。

1.2 目的及意义