某X市城区排水管网和污水处理厂设计毕业设计全套（cad图纸、计算书、说明书、任务书、翻译等）

摘 要
本设计为XX市城区排水管网和污水处理厂设计，主要包括城区污水管网和污水处理厂的设计。设计人口密度为300cap/ha，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2.0万m3/d，主体处理工艺采用A2/O生物脱氮除磷。

设计中对污水处理厂进行了详细设计。设计中选用两组平流沉砂池，长宽为6.0m×1.46m；两组辐流沉淀池，直径20.0m；两组A2/O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。本工程总投资9703.3万元，污水处理成本为0.78元/m3。

关键词：污水管网；污水处理厂；平流沉砂池；辐流沉淀池；A2/O反应池

Design of Sewer Network & Wastewater Treatment Plant

for Gao ping City

ABSTRACT
This is a design of sewer network & wastewater treatment plant, mainly including sewer network design & wastewater treatment plant design for Gao ping City. The population density of design is 300cap/ha 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 2.0×10m3/d. The A2/O tank was used as main treatment unit.
Every unit of the wastewater treatment plant was designed detailedly. 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.The total project investment is 0.97×108yuans, The cost of wastewater treatment is 0.78 yuan/m3　　.

Key Words: Sewer Network; wastewater treatment plant; Horizontal-flow Grit Chamber ; Radial Sedimentation Tank; A2/O tank

目  录

摘 要III

ABSTRACTIV

1前 言1

2设计任务及要求

2.1 设计任务2

2.2 设计基本要求2

3总体设计

3.1城镇排水系统的确定4

3.2 城镇污水处理工艺流程的确定4

3.2.1确定污水处理工艺流程的原则4

3.2.2污水处理方案的确定4

3.2.3 主要构筑物的选择8

4 城镇排水管网设计

4.1排水系统体制的确定13

4.2污水管道的布置13

4.3 污水管道的设计流量计算13

4.4污水管道的水力计算18

5 城市污水处理厂设计

5.1 污水量计算20

5.2一级处理设计20

5.2.1格栅的设计20

5.2.2沉砂池的设计24

5.2.3  初沉池的设计27

5.3 二级生物处理设计33

5.3.1已知条件33

5.3.2设计计算（用污泥负荷法）33

5.4　生物处理后处理43

5.4.1 二次沉淀池43

5.4.2  消毒设施计算51

5.4.3 计量设施54

5.5　污泥处理工艺的设计57

5.5.1 污泥量计算57

5.5.2 浓缩池的设计59

5.5.3 贮泥池计算62

5.5.4消化池设计63

5.5.5污泥脱水机房68

5.6 其他设计69

5.6.1 污水提升泵房设计69

5.6.2 污泥泵房75

5.7 污水处理厂总体布置76

5.7.1 污水处理厂平面布置76

5.7.2 污水构筑物高程布置77

5.7.3 污泥处理构筑物高程布置80

6工程经济计算83

7结 论85

谢 辞86

参考文献87