污水处理厂设计说明书

摘要

本毕业设计是针对陕北某城区污水处理厂进行的CASS工艺设计。此次的污水处理量为30000m

3

/d，进水水质：COD ：560mg/l，BOD：300mg/l，SS ：400mg/l，

5

NH4-N: 60 mg/l，TP：4mg/l， pH： 6～9

根据进水水质、水量、出水要求和城市的实际情况，经综合比较分析，决定采用CASS工艺。整个工艺的曝气、沉淀、排水等过程在同一池子内周期循环运行，省去了常规活性污泥法的二沉池和污泥回流系统。通过选择适当的设计参数，对主要构筑物进行了设计，包括格栅、提升泵房、沉砂池、CASS池、混凝澄清池、纤维转盘滤池、接触消毒池、污泥浓缩池、污泥消化池等。同时，对该污水处理厂进行了平面布置和高程布置和其他附属建筑物尺寸的设计。

关键词：污水处理厂；CASS工艺；平面布置；高程布置

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Abstract

CASS process is used for the treatment of sewage in A County Sewage Treatment Plant.The daily average treatment capacity of this plant is 30,000m3/d,and the influent water quality is:COD ：560mg/l，BOD5：300mg/l，SS ：400mg/l， NH4-N: 60 mg/l，TP：4mg/l， pH： 6～9。

According to the influent water quality,water quantity,effluent requirements and the actual situation of the city,CASS process is adopted through comprehensive comparative analysis.The aeration,sedimentation,drainage,and other processes are realized in the same tank within a period.Secondary sedimentation tank and sludge backflow system in traditional activated sludge method are not necessary any more.Suitable design parameters should be selected to design the main structures,including the grid,pumping station,grit chamber,CASS pool,contact Coagulation sedimentation basin,Fiber rotary filter, and disinfection tank,sludge thickening tank,Sludge digest.eretc.At the same time,the layout of this sewage treatment plant,and its elevations,as well as the dimensions of other auxiliary structures are designed.

Key Words:Sewage treatment plant;CASS process;Plane Layout;Elevation Arrangement

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目录

1 工程规模和处理水质要求 ......................................................................................................... 1

1.1 工程规模 .......................................................................................................................... 1 1.2 设计水质 .......................................................................................................................... 1

1.2.1 进水水质 ............................................................................................................... 1 1.2.2 出水水质 ............................................................................................................... 1 1.2.3 其他资料 ............................................................................................................... 2 1.3 设计依据 .......................................................................................................................... 2 2 处理工艺选择与确定 ................................................................................................................. 3 2.1 工艺比选 .................................................................................................................................. 3

2.1.1 格栅 ....................................................................................................................... 3 2.1.2 污水提升泵房 ....................................................................................................... 4 2.1.3 沉砂池 ................................................................................................................... 4 2.1.4 生物构筑物 ........................................................................................................... 5 2.1.5 曝气设施 ............................................................................................................... 8 2.1.6 深度处理工艺的选择 ....................................................................................... 10 2.1.7 污水消毒设施 ..................................................................................................... 11 2.1.8 污泥浓缩 ............................................................................................................. 13 2.1.9 污泥消化 ............................................................................................................. 14 2.1.10 贮泥池 ............................................................................................................... 14 2.1.11 污泥脱水 ........................................................................................................... 15 2.2 工艺确定 ........................................................................................................................ 15

2.2.1 工艺的选择 ......................................................................................................... 15 2.2.2 污水处理工艺流程示意图 ................................................................................. 16

3 主要工艺设计参数及计算 ....................................................................................................... 17

3.1 粗格栅设计参数 ............................................................................................................ 17

3.1.1 粗格栅的设计计算 ............................................................................................. 17 3.2 调节池及污水提升泵房的设计 .................................................................................... 19

3.2.1.流量的确定 .......................................................................................................... 19 3.2.2 调节池的设计 ..................................................................................................... 20 3.3 细格栅设计参数及计算 ................................................................................................ 21 3.4 旋流沉砂池 .................................................................................................................... 23

3.4.1设计要求 .............................................................................................................. 23 3.4.2 设计计算 ............................................................................................................. 24 3.5 CASS工艺 ...................................................................................................................... 25

3.5.1 设计参数 ............................................................................................................. 25 3.5.2 设计计算 ............................................................................................................. 25

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3.5.3 化学除磷计算 ..................................................................................................... 29 3.6 曝气系统设计计算 ........................................................................................................ 30 3.7 布气系统设计计算 ........................................................................................................ 33 3.8 鼓风机供气压力计算 .................................................................................................... 34 3.9 滗水器的设计计算 ........................................................................................................ 35

3.9.1 XB旋转式滗水器的工作原理 ............................................................................ 36 3.10 混凝澄清池 .................................................................................................................. 37 3.11 纤维转盘滤池 .............................................................................................................. 37 3.12 消毒接触池 .................................................................................................................. 39

3.12.1 接触池尺寸计算 ............................................................................................... 39 3.12.2 加氯及静态混合器 ........................................................................................... 40 3.12.3 排泥设施 ........................................................................................................... 40 3.13 巴氏计量槽 .................................................................................................................. 41 4 污泥处理系统工艺设计 ........................................................................................................... 44

4.1 反应池中污泥量的计算 ................................................................................................ 44 4.2 污泥浓缩池的设计计算 ................................................................................................ 45

4.2.1浓缩池池体尺寸 .................................................................................................. 45 4.2.2 排泥量与存泥容积： ......................................................................................... 46 4.2.3 浓缩池总高度 ..................................................................................................... 47 4.3 污泥消化池 .................................................................................................................... 47 4.4 贮泥池 ............................................................................................................................ 48

4.4.1消化污泥量 .......................................................................................................... 48 4.4.2 贮泥池容积 ......................................................................................................... 48 4.5 污泥的化学调质 ............................................................................................................ 49 4.6 污泥脱水泵房 ................................................................................................................ 50

4.6.1 设计参数 ............................................................................................................. 50 4.6.2 设计计算 ............................................................................................................. 50

5 污水处理厂的总体布置与高程水力计算 ............................................................................... 52

5.1 污水处理厂的平面布置 ................................................................................................ 52

5.1.1 污水厂平面布置原则 ......................................................................................... 52 5.1.2 污水厂的平面布置 ............................................................................................. 53 5.2 高程布置原则 ................................................................................................................ 54 5.3 高程布置结果 ................................................................................................................ 54 6 经济估算 ................................................................................................................................... 57

6.1 定员原则 ........................................................................................................................ 57 6.2 人员培训 ........................................................................................................................ 59 6.3 技术管理 ........................................................................................................................ 59 6.4 附属构筑物 .................................................................................................................... 60 6.5 附属化验设备 ................................................................................................................ 60

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6.6 水厂的工程造价 ............................................................................................................ 61 6.7 单项构筑物的工程造价计算 ........................................................................................ 61 7 结 论 ....................................................................................................................................... 64 参考文献 ....................................................................................................................................... 65 致谢 ............................................................................................................................................... 66

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