污水处理a2o工艺设计---说明书.doc

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污水处理a2o工艺设计---说明书.doc

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南京林业大学

课程设计任务书

学院（系）：

化学工程学院

专业：

环境工程系

学生姓名：

鲍宇

学生学号：

课程设计题目：

70000m3/d城市污水处理厂工艺设计

起讫日期：

6月3日-7月3日

指导老师:

陈一良

1．摘要22.第一章设计概论2

1.1设计依据和任务2

1.2设计要求2

3.第二章工艺流程的选择3

4.第三章工艺流程设计计算4

3.1设计流量的计算4

3.2设备设计计算4

3.2.1格栅4

3．2.2提升泵房5

3.2.3细格栅6

3.2.4沉砂池7

3.2.5初沉池8

3.2.6A2/O10

3.2.7二沉池16

3.2.8接触池和加氯间17

3.2.9污泥处理构筑物的计算18

5.第四章平面布置23

4.1污水处理厂平面布置23

4.1.1平面布置原则23

4.1.2具体平面布置24

4.2污水处理厂高程布置26

4.2.1主要任务26

4.2.2高程布置原则26

4.2.3高程布置结果26

6.第五章参考文献30

摘要

随着社会进步，人们对于城市污水的处理的要求愈加严格。

除了基本的去除污水中BOD和SS的要求外，通常还要求工艺由于不同环境条件，不同功能的微生物群落的有机配合，加之厌氧、缺氧条件下，部分不可生物降解的有机物能被开环或断链，使得N、P、有机碳被同时去除，并提高对不可降解有机物的去除效果。

它可以同时完成有机物的去除，硝化脱氮、磷的过量摄取而被去除等功能，脱氮的前提是NH3－N应完全硝化，好氧池能完成这一功能，缺氧池则完成脱氮功能。

厌氧池和好氧池联合完成除磷功能。

此外该工艺还具有高效、节能的特点，且耐冲击负荷较高，出水水质好。

因此,更具有广泛的适应性，完全适合本设计的实际要求。

本工艺的主要构筑物包括格栅、污水泵房、平流沉砂池、好氧池、厌氧池、缺氧池、二沉池、接触消毒池、浓缩池、污泥脱水机房等。

关键词：

格栅泵房二沉池

第一章设计概论

1.1设计依据和任务

1.本课程设计课题任务的内容和要求（包括原始数据、技术参数、设计要求等）

设计基础资料：

原始数据:

Q=70000m3/d

某城镇污水处理厂设计日平均水量为70000m3/d.进水水质如下（单位：

mg/l）

COD

BOD5

NH3-N

处理前

6-9

390

180

280

处理后

6-9

（1）污水处理要求达到《城镇污水处理厂污染物排放标准》中的一级B标准。

（2）生化部分采用A2/O工艺。

（3）来水管底标高446.0m。

受纳水体位于厂区南侧150m，50年一遇最高水位448.0m。

（4）厂区地势平坦，地坪标高450.0m。

厂址周围工程地质良好，适合于修建城市污水处理厂。

（5）所在地区平均气压730.2mmHg，年平均气温13.1℃,常年主导风向为东南风。

1.2设计要求

（1）设计计算说明书。

说明设计的任务、内容和要求，设计的范围和依据，工艺流程的确定，进行工艺设计计算，包括计算过程（含计算草图），主要设备的选取等。

（2）设计图纸两张（CAD绘图）

总平面布置图或工艺流程及高程布置图。

构筑物工艺设计图，选取一个主要的构筑物。

图纸应比例适当，布局紧凑合理，表达准确充分，绘图符合标准和规范。

第二章工艺流程的选择

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