论文总字数：28246字

摘 要

水污染问题和水资源短缺困扰着我国经济社会的可持续发展，城镇污水已成为继工业废水之后的第二大污染源。本文对采用曝气生物滤池为主体工艺的污水处理厂进行了设计计算。

设计计算部分包括对污水的预处理构筑物的计算、曝气生物滤池部分的计算、对污泥的浓缩消化计算以及污水处理厂的管道与高程计算。

污水经格栅和沉砂池排出大量的漂浮杂物和悬浮物，沉砂池出水汇同反冲洗排水进入初沉池，再流入水解酸化池进行水解酸化。水解酸化池出水依次进入C/N曝气生物滤池、N曝气生物滤池和DN曝气生物滤池，去除废水中的有机物、悬浮物和氨氮以及废水中的磷。

污泥由初沉池和水解酸化池排出后，到达污泥泵房，提升至污泥浓缩池，浓缩后汇于贮泥池，进过两级消化，再经过脱水后由车辆运送出厂。

关键词：城镇污水 曝气生物滤池 污泥

Abstract

Water pollution problems and water shortages are plaguing China's economic and social sustainable development. Urban sewage has become the second largest source of pollution after industrial waste water. In this paper, the design and calculation of the sewage treatment plant with the aerated biological filter as the main process was carried out.

The design calculation section includes the calculation of the pretreatment structure of the sewage, the calculation of the aerated biological filter section, the calculation of the concentration and digestion of the sludge, and the pipeline and elevation calculation of the sewage treatment plant.

The sewage is taken out of the grid and the grit chamber to take out a large amount of floating debris and suspended matter. The water from the grit chamber is discharged into the primary sedimentation tank with the backwashing water, and then flows into the hydrolysis acidification tank for hydrolysis and acidification. The effluent from the hydrolysis acidification tank sequentially enters the C/N aerated biological filter, the N aerated biological filter and the DN aerated biological filter to remove organic matter, suspended matter and ammonia nitrogen in the wastewater and phosphorus in the wastewater.

After the sludge is discharged from the primary sedimentation tank and the hydrolysis acidification tank, it reaches the sludge pumping room, is upgraded to the sludge concentration tank, is concentrated and then remitted to the sludge storage tank, and is digested by two stages, and then transported by the vehicle after being dehydrated.

Keywords: urban sewage;biological aerated filter;sludge.

目录

第一章 绪论 1

1.1 工艺比选与介绍 1

1.2 设计内容 2

第二章 设计说明 3

2.1 设计资料 3

2.2工艺流程及其说明 4

第三章 污水处理构筑物设计计算 5

3.1中格栅 5

3.2 集水池 8

3.3 细格栅 9

3.4 旋流式沉砂池 12

3.5 幅流式初沉池 15

3.6 水解酸化池 21

3.7 C/N曝气生物滤池 24

3.8 N型曝气生物滤池 31

3.9 DN型曝气生物滤池 37

3.10 接触消毒池 42

3.11 巴式计量槽 45

第四章 污泥处理构筑物设计计算 48

4.1 污泥浓缩池 48

4.2 贮泥池 51

4.3 污泥厌氧消化 52

4.4 污泥脱水 56

第五章 污水处理厂管道布置及高程计算 58

5.1 管道水头损失计算 58

5.2 高程 64

第六章 泵的选型 69

6.1 污水提升泵房 69

6.2 污泥提升泵房 69

参考文献 70

致谢 71

第一章 绪论

1.1 工艺比选与介绍

传统活性污泥法处理效果好，适用于处理净化程度和稳定程度较高的污水，但是，在实际运行过程中，仍存在污泥膨胀的问题、泡沫问题、污泥上浮问题、流速不均及污泥沉积问题等一系列问题。

SBR法比较简单，但是不适用于大规模的污水处理厂，且有诸多局限性，如容积和设备利用率低。

曝气生物滤池使得污水能够与滤料充分接触,由于气、液、固三相的相互接触,氧气的传质效率大大提高,节省能源，同时节省占地面积,减小基建费用

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