摘 要

Abstract 5

第一章 绪论 6

2.5 主要构筑物的选择 12

3.1排水区界和排水流域的划分 15

3.1.1排水区界 15

3.1.2排水流域 15

3.2排水管网定线 15

3.2.1排水管网定线原则 15

3.2.2定线的影响因素 16

3.3污水管道的设计计算 16

3.3.1污水管网水力计算步骤 16

3.3.2布置污水管道 17

3.3.3街坊编号并计算其面积 17

第四章 雨水管网的水力计算 18

4.1雨水管网水力计算步骤 18

4.2主要设计参数 18

4.2.4单位面积净流量的计算公式 19

第五章 污水处理构筑物设计 20

5.1中格栅和提升泵房(两者合建) 20

5.1.1设计参数： 20

5.1.2设计计算 20

5.1.3提升泵房： 22

5.2细格栅和沉砂池 23

5.2.1设计计算 23

5.2.2沉砂池设计 25

5.2.3设计计算 25

5.3 A²O反应池 27

5.3.1 反应池设计参数 27

5.3.2反应池容积计算 27

5.3.4剩余污泥 29

5.3.5反应池进、出水系统计算 29

5.4曝气系统计算 32

5.5幅流式二沉池 37

5.5.1设计说明 37

二沉池选用圆形的辐流式沉淀池,采用中间进水周边出水方式，设两座。 37

5.6接触消毒池 39

第六章 污泥处理构筑物的设计计算 41

6.1污泥泵房 41

6.2污泥浓缩池（污泥的脱水） 42

6.2.1.设计参数 42

6.2.2.设计计算 42

第七章 污水厂平面，高程布置 45

7.1平面布置 45

7.2管线布置 45

7.3高程布置 46

7.3.1水头损失计算 46

7.3.2 高程确定 47

8. 污水处理成本的计算 48

8.1 动力费 48

8.3 工资福利费 49

8.4 折旧提成费 49

8.5 检修维护费 49

8.6 其它费用(行政管理 , 辅助费用) 49

8.7 单位水处理成本 49

参考文献 50

摘要

本设计为公安市南部地区排水工程设计，由管网设计和污水厂设计两部分组成。排水管网采用雨污分流制设计，污水汇集到污水厂进行统一处理，雨水由三根不同的干管分别就近排入水体。污水厂根据国家一级排放标准要求所达到的处理程度(出水SS浓度为20mg/L，BOD₅浓度为20mg/L)进行设计，近期处理规模为11219m³/d，污水处理流程为：进水→中格栅→提升泵房→细格栅→平流沉砂池→A²O氧化沟→辐流式二沉池→接触消毒池→出水；污泥流程为：一部分污泥经过污泥泵房回流到反应池，其余污泥由污泥泵送入污泥脱水间，经脱水后外运。

经过污水处理可以实现污水的无害化，不仅使河流免受污染，还使我们的环境更加优美，这对社会和谐和可持续发展具有重要意义。

关键词 污水；污水处理；构筑物；二级处理；工艺；脱氮除磷

Abstract

This design is a drainage engineering design for the southern part of the Gongan City. It consists of two parts: the pipe network design and the sewage plant design. The drainage pipe network adopts the rain and sewage diversion system design, and the sewage is collected into the sewage treatment plant for unified treatment. The rainwater is discharged into the water body from three different dry pipes respectively. The wastewater treatment plant is designed according to the requirements of national first-class discharge standards (effluent SS concentration is 20mg/L, BOD5 concentration is 20mg/L), the recent treatment scale is 11,219m3/d, and the sewage treatment process is: Influent → Medium Grid→Lift pump room→Grill grid→Advection grit chamber→A2O oxidation ditch→Radial type secondary sedimentation tank→Contact disinfection tank→Outflow; The sludge process is: Part of the sludge flows back to the reaction tank through the sludge pump house. The rest of the sludge is sent to the sludge dehydration room by the sludge pump and transported after dehydration.

Sewage treatment can achieve the harmlessness of sewage, not only to protect rivers from pollution, but also to make our environment more beautiful. This is of great significance for social harmony and sustainable development.Sewage treatment can achieve the harmlessness of sewage, not only to protect rivers from pollution, but also to make our environment more beautiful. This is of great significance for social harmony and sustainable development.

Key words sewage; sewage treatment; structure; secondary treatment; process; nitrogen and phosphorus removal