毕业设计说明书污水厂CASS工艺

XX某经济开发区污水处理厂设计

摘要：本设计主要是XX市某经济开发区污水处理厂的设计，该污水厂位于经济开发区，根据对原水水质的分析，以及参考大量的污水处理资料，综合考虑技术、经济等因素，最终采用现行的SBR变形形式CASS工艺。CASS是周期循环活性污泥法的简称，又称为循环活性污泥工艺，是在SBR的基础上发展起来的，即在SBR池内进水端增加了一个生物选择器，实现了连续进水(沉淀期、排水期仍连续进水)，间歇排水。该污水厂设计的流程为进水→粗格栅→提升泵房→细格栅→平流沉砂池→CASS池→普快滤池→消毒池→出水。污泥的处理流程为CASS→污泥提升泵房→储泥池→浓缩池。该厂出水达到设计要求。

关键词：污水处理厂；CASS；污泥处理

Factory design of an Economic Development Zone

Wastewater Treatment in Nantong

Abstract:This design is the design of wastewater treatment plant of a economic development zone of Nantong City, the sewage treatment plant is located in the economic development zone, based on the analysis of the raw water quality, sewage and reference data processing large, prehensive consideration of technical, economic and other factors, the current SBR deformation form of CASS process. CASS is a cyclic activated sludge method abbreviation, also known as cyclic activated sludge technology, is in the SBR developed on the basis of SBR, namely in the pool water inlet end adds a biological selector, realizes continuous water (precipitation, drainage period is still continuous, intermittent drainage.). The design of wastewater treatment plant process water, coarse grid, pumping station, fine grid, adve ction sedimentation tank, CASS tank → Pukuai filter, disinfection pool, water. Treatment process of sludge is CASS, sludge pumping station, sludge storage tank, concentrated pool. The effluent can meet the design requirements.

Key words: Sewage treatment plant; CASS;sludge disposal

目录摘要I

AbstractII

1 绪论1

1．1 课题研究意义1

2污水厂概况1

2.1地理位置及气候1

2.2设计规模及进出水水质2

2.3 处理程度的计算2

3 城市污水处理设计2

3.1污水处理工艺流程选择2

3.2 工艺比较3

3.2.1氧化沟方案3

3.2.2 CASS工艺方案4

3.3方案的确定6

3.4工艺流程图6

4 污水处理构筑物的设计说明7

4.1 粗格栅的设计7

4.1.1 格栅尺寸7

4.1.2 通过格栅的水头损失h18

4.1.3 栅后槽总高度H8

4.1.4 栅槽总长度L8

4.1.5 每日栅渣量W9

4.1.6 格栅的选择9

4.2提升泵房10

4.3细格栅10

4.3.1细格栅的隔栅尺寸10

4.3.2通过格栅的水头损失h111

4.3.3 栅后槽总高度H11

4.3.4 栅槽总长度L11

4.3.5 每日栅渣量W12

4.4 平流式沉砂池12

4.4.1 功能：12

4.4.2 设计计算13

4.4.3主要工程内容14

4.5 CASS生化池15

4.5.1 CASS的功能15

4.5.2 设计计算15

4.6 滤池设计计算20

4.7接触消毒池与加氯间21

4.7.1 设计说明：21

4.7.2 设计计算21

5. 污泥的处理与处置23

5.1贮泥池计算23

5.2 污泥提升泵房23

5.3 浓缩池设计计算23

5.4 污泥脱水计算25

5.4.1 浓缩后污泥量25

5.4.2 脱水工艺及脱水设备的选择25

6 污水厂总体布置26

6.1 污水处理厂平面布置原则26

6.2 污水处理厂高程布置原则26

6.2.1 污水处理厂高程布置应考虑事项：26

6.2.2污水厂的高程布置26

6.2.3高程布置计算26

总结29

参考文献29

致谢30