论文总字数：19801字

摘 要

本次设计为长沙暮云污水处理及中水回用工程设计，规划末期污水量为28.5 ×10⁴ m³/d、中水需水总量为7.7 ×10⁴ m³/d。计算按远期水量计算，由于没有提供工业废水的变化系数，所以按生活污水量来取其时变化系数。本工程设计进水水质为CODcr=300mg/l、BOD5=130mg/l、SS=250mg/l、TN=30mg/l、TP=3mg/l 。通过方案比选，确定了污水处理工艺流程为：粗格栅-集水井-提升泵房-细格栅-旋流沉砂池-平流沉淀池-A/A/O-二沉池-接触池-集水井-中水提升泵房。污泥处理采用重力浓缩池和压滤机，产生的泥饼外运作进一步处理。预估CODcr、BOD5、SS、TN、TP的去除率分别为83.33%、92.30%、96.00%、50.00%、83.33%。处理后的水质可以达到一级A标准。本工程设计计算完全遵循相关规范，合理选取相关参数，在严谨的计算下得出各个构筑的基本尺寸，水位等信息。在此基础上进行水厂平面布置，根据各构筑物的水力要求和功能性质合理排布，使水厂紧凑，节约用地。计算出了构筑物之间的水头损失，估算构筑物内部损失。完成平面及高程图绘制。通过本污水厂处理能有效改善生态环境，回用的中水可以充分利用水资源，避免浪费，有利于当地发展。

关键词：生活污水；工艺流程设计；污水处理；A/A/0生化池；中水回用

abstract

This design is the design of Changsha Dusk Cloud Sewage Treatment and Reclaimed Water Reuse Project. At the end of the planning period, the amount of wastewater is 28.5 *104 m3/d, and the total amount of reclaimed water demand is 7.7 *104 m3/d. The calculation is based on the long-term water volume. Since the coefficient of variation of industrial wastewater is not provided, the coefficient of variation is taken from the amount of domestic wastewater. The water quality of the project is CODcr=300mg/l, BOD5=130mg/l, SS=250mg/l, TN=30mg/l and TP=3mg/l. Through the scheme comparison, the sewage treatment process is determined as follows: coarse grille - catchment well - lifting pump house - fine grille - swirling sand sink - advection sedimentation tank - A/A/O - secondary sedimentation tank - contact tank - catchment well - intermediate water lifting pump house. The sludge is treated by gravity concentration tank and filter press, and the sludge cake produced is further treated by operation outside the sludge cake. The removal rates of CODcr, BOD5, SS, TN and TP were estimated to be 83.33%, 92.30%, 96.00%, 50.00% and 83.33% respectively. The treated water quality can meet the first A standard. The design and calculation of this project fully follow the relevant specifications, reasonably select the relevant parameters, and get the basic size and water level information of each structure under the rigorous calculation. On this basis, the layout of the waterworks is carried out. According to the hydraulic requirements and functional properties of the structures, the waterworks are arranged reasonably so as to make them compact and save land. The head loss between structures is calculated and the internal loss of structures is estimated. Complete the drawing of plane and elevation map. The wastewater treatment plant can effectively improve the ecological environment, reuse of reclaimed water can make full use of water resources, avoid waste, conducive to local development.

Key words: domestic sewage; process design; sewage treatment; A/A/0 biochemical tank; reclaimed water reuse

目录

摘要 1

Abstract 2

目录 3

第一章 污水厂基本资料 5

1.1 水量计算 5

1.2 水质分析 5

1.3 工艺方案比选 6

第二章 污水处理构筑物设计计算 8

2.1 泵前格栅 8

2.1.1泵前格栅设计参数 8

2.1.2格栅设计计算 9

2.2 集水井及提升泵房 10

2.3 泵后细格栅 12

2.3.1泵后细格栅设计参数 12

2.3.2格栅设计计算 12

2.4 旋流沉砂池 14

2.4.1设计要点 14

2.4.2设计参数 14

2.4.3设计计算 14

2.5初沉池 17

2.5.1设计参数 17

2.5.2设计计算 17

2.6 A/A/O生物脱氮除磷 19

2.6.1工艺流程 19

2.6.2进出水水质 19

2.6.3设计参数 19

2.6.4设计计算 20

2.7鼓风机房 23

2.8二沉池 25

2.8.1设计参数： 25

2.8.2基本尺寸计算 26

2.8.3进水系统设计 26

2.8.4出水堰设计 27

2.9接触消毒池与加氯间 28

2.9.1 设计参数 28

2.9.2设计计算 28

2.9.3加氯量计算： 29

2.10中水回用泵站 29

2.10.1基本资料 29

2.10.2设计计算 30

第三章 污泥处理构筑物设计计算 31

3.1污泥浓缩池 31

3.1.1设计参数 31

3.1.2设计计算 31

3.2贮泥池 32

3.3污泥脱水机房 33

第四章 污水厂平面与高程布置 33

4.1污水厂平面布置 33

4.2高程布置 34

4.2.1水头损失计算 34

4.2.2高程确定 35

第五章 污水厂工程概预算 36

参考文献 38

第一章 污水厂基本资料

水量计算

根据毕业设计任务书

以远期污水量为标准

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