摘 要

Abstract 2

1 绪论 1

1.1 设计背景 1

1.2 设计任务 1

1.3 原始资料 1

2 设计说明书 4

2.1 排水体制 4

2.2 污水管道设计 4

2.2.1 设计范围 4

2.2.2 设计人口及设计面积 4

2.2.3 比流量 4

2.2.4 污水管道设计方案 4

2.2.5 街坊排水面积划分 5

2.2.6 污水管道衔接方式 5

2.2.7 管材及管道用量 5

2.2.8 污水管道平面布置图 6

2.3 雨水管道设计 8

2.3.1 排水流域 6

2.3.2 设计重现期 6

2.3.3 雨水管道布置方案 6

2.3.4 设计管段划分 7

2.3.5 雨水面积划分 7

2.3.6 管材及用量 7

2.4.污水厂设计 8

2.4.1 污水处理厂规模及设计流量 8

2.4.2 污水厂进出水水质 8

2.4.3 污水处理厂工艺流程 8

2.4.4 污水厂各构筑物设计 11

2.4.5 污水处理厂的平面布置 18

2.4.6 污水处理厂的高程布置 18

3 设计计算书 21

3.1 污水管道流量计算 21

3.1.1 流量计算 21

3.1.2 管道设计流量的计算 22

3.1.3 污水管道水力计算 23

3.2 雨水管道流量计算 23

3.2.1 划分设计管段 23

3.2.2 划分并计算各设计管段的汇水面积 23

3.2.3 确定排水流域的径流系数 24

3.2.4 雨水管网水力计算 25

3.3 污水厂设计计算 26

3.3.1 设计水量 26

3.3.2 设计水质 27

3.3.3 污水处理工艺流程选定 27

3.3.4 污水处理构筑物设计计算 46

3.3.5 污泥处理构筑物设计计算 46

3.3.6 污水处理厂的平面布置 49

3.3.7污水处理厂的高程布置 51

4 结语 61

参考文献 64

附录 65

致谢 66

摘要

本设计共分成两个部分，一为城区雨水、污水管道的设计，二为污水厂设计。根据杨家新沟以北河山支渠以南片区所处地理位置以及地形条件，排水管网采用雨、污分流制的形式，污水收集到污水厂集中处理，雨水则就近排入水体。污水处理厂根据水厂规模以及处理效果，出水水质的要求，采用AAO同步脱氮除磷工艺。该工艺的污水处理流程为：中格栅→提升泵房→细格栅→沉砂池→AAO 生物反应池→二沉池→高密度沉淀池→转盘滤池→消毒池→出水排放。污泥处理则采用浓缩脱水一体机。通过此工艺流程，污水处理厂出水质达到《城镇污水处理厂污染物排放标准》GB18918-2002中的一级A标准。

设计中对污水管网、雨水管网以及污水处理厂的各主体构筑物如中格栅、提升泵房、细格栅、平流沉砂池、A-A-O 生物反应池、辐流式二沉池、高密度沉淀池、转盘滤池和消毒池等进行了系统、详细的设计计算和说明。

关键词：排水管网、污水处理、AAO工艺

Abstract

The design is divided into two parts, one is the design of urban rainwater and sewage pipeline, and the other is the design of sewage plant. According to the geographical position and topographical conditions of the area south of the Heshan branch canal in the north of Yangjiaxigou, the drainage pipe network adopts the form of rain and sewage diversion system, the sewage is collected to the sewage treatment plant for centralized treatment, and the rainwater is discharged to the nearest water body. According to the scale and treatment effect of water plant and the requirement of effluent water quality, AAO synchronous nitrogen and phosphorus removal process is adopted in the sewage treatment plant. The sewage treatment flow of the process is: Medium grid → lifting pump room → fine grid → sand sedimentation tank → AAO biological reaction tank → secondary sedimentation tank → high density sedimentation tank → rotary filter → disinfection tank → effluent discharge. In sludge treatment, concentrate and dewatering integrate machine is used. Through this process flow, the effluent quality of sewage treatment plant reaches Grade A standard in the Standard for Pollutant Discharge of Urban Sewage Treatment Plant (GB18918-2002).

In that design, various main structure of sewage pipe network, rainwater pipe network and sewage treatment plant such as medium grid, lifting pump house, fine grid, horizontal flow sand sedimentation tank, A-A-O biological reaction tank, radial flow secondary sedimentation tank, high density sedimentation tank, The rotary filter and the disinfection tank are systematically, and the detailed design calculation and explanation are given.

Key words: Drainage pipe network, sewage treatment, AAO process