xx市污水处理厂工程工艺设计.doc

xx市污水处理厂工程工艺设计

摘  要
本设计为尚志市污水处理厂工程工艺设计，污水处理厂处理规模为一期40000m3/d，二期60000 m3/d。污水主要来源为生活污水和工业废水，主要污染物质为NH3-N、BOD、COD，适宜采用生化处理方法。经过方案比较，确定采用三槽式氧化沟工艺。NH3-N、BOD、COD的去除率分别达到92%、93%、89%，污水处理厂处理后的出水达到《污水综合排放标准》（GB8978-1996）中的二级标准。
污水和活性污泥的混合液在氧化沟中进行不断的循环运动，具有良好的去除BOD、COD及脱氮除磷的功能。另外，工艺流程简单，构筑物少，构造形式多样，运行较为灵活，运行稳定性好，基建投资省，运行费用低，操作管理方便，出水水质好也是氧化沟优于其他处理工艺的地方。
关键词：污水处理，氧化沟，脱氮除磷、BOD、COD

Abstract
This design is about the sewage treatment plant in Shangzhi City. The construction of this plant is 40000 m3/d. The main origin of the sewage is the sanitary sewage and the industrial waste. The main polluting is the NH3-N, BOD, COD. It is suitable to use the biochemistry processing method. After the comparison of the plan, the Three Type Oxidation Ditch craft was chosen as the process. The elimination rate of the NH3-N, BOD, COD respectively achieved 92%, 93%, 89%. The outlet water of the treatment meets the level two of the National Sewage Discharge Standard (GB8978-1996).
The mixed liquor of the sewage and the activated sludge are sporting unceasingly in the oxidation ditch. It is good to exclude BOD、COD and take off the nitrogen and the phosphorus. Additionally, the simple processing, the few buildings, the varied structure, the nimble movement, and the good stability of the movement, the province initial cost, the low operating cost, the convenient operation and management, the good quality of the letout water are also the places which the oxidize ditch is better than the other technology.
Key Words：Sewage treatment, Oxidation ditch, Niteogen and Phosphorus Removal, Biochemical Oxygen Demand, Chemical Oxygen Demand

目录
第一章 概述-------------------------------------------------------------------------------------1
1.1城市污水的特征及建造城市污水处理厂的必要性----------------------------------1
1.2我国水处理技术的发展-------------------------------------------------------------------1
1.3 设计任务及内容---------------------------------------------------------------------------2
1.3.1设计基础资料-----------------------------------------------------------------------2
1.3.2设计要求-----------------------------------------------------------------------------2

第二章  污水厂设计方案的确定-----------------------------------------------------------4
2.1 污水处理方案的确定---------------------------------------------------------------------4
2.1.1普通A/A/O法处理工艺----------------------------------------------------------6
2.1.2 氧化沟处理工艺-------------------------------------------------------------------7
2.2 污泥处理方案的确定---------------------------------------------------------------------9
    2.2.1污泥浓缩-----------------------------------------------------------------------------9
    2.2.2污泥消化----------------------------------------------------------------------------10
2.2.3污泥干化与脱水-------------------------------------------------------------------10

第三章  污水厂构筑物设计计算----------------------------------------------------------12
3.1 中格栅计算---------------------------------------------------------------------------------12
3.2污水提升泵房-------------------------------------------------------------------------------15
    3.2.1设计参数-----------------------------------------------------------------------------15
    3.2.2泵房设计计算-----------------------------------------------------------------------16
3.3.细格栅计算----------------------------------------------------------------------------------17
3.4 平流沉砂池计算---------------------------------------------------------------------------19
3.5配水井----------------------------------------------------------------------------------------22
3.6 三沟式氧化沟计算------------------------------------------------------------------------23
     3.6.1确定设计有关参数---------------------------------------------------------------23
     3.6.2容积计算---------------------------------------------------------------------------24
     3.6.3剩余污泥量计算------------------------------------------------------------------26
     3.6.4进水管和出水管------------------------------------------------------------------27
     3.6.5出水堰及出水竖井---------------------------------------------------------------27
     3.6.6实际需氧量计算------------------------------------------------------------------27
     3.6.7设备选择---------------------------------------------------------------------------29
3.7 接触池计算---------------------------------------------------------------------------------30
3.8.1设计参数-----------------------------------------------------------------------------------30
3.8.2设计计算-----------------------------------------------------------------------------------31
3.8 污泥泵房计算------------------------------------------------------------------------------32
3.9污泥浓缩池----------------------------------------------------------------------------------32
    3.9.1设计参数-----------------------------------------------------------------------------33
    3.9.2设计计算-----------------------------------------------------------------------------33
3.10 贮泥池计算--------------------------------------------------------------------------------35
3.11 脱水机房计算-----------------------------------------------------------------------------35

第四章 污水处理厂平面及高程布置-------------------------------------------------------36
4.1高程布置-------------------------------------------------------------------------------------36
4.1.1水头损失计算-----------------------------------------------------------------------------36
4.1.2高程确定-----------------------------------------------------------------------------------37
4.2 污水处理厂总平面布置原则------------------------------------------------------------37

结论------------------------------------------------------------------------------------------------39
致谢------------------------------------------------------------------------------------------------40
参考文献------------------------------------------------------------------------------------------41