论文总字数：36558字

摘 要

由于泰兴市城市规模的扩大，居住人口数量剧增，现有的污水厂处理能力不能满足城市发展的需求，亟待扩容建设。本次毕业设计的任务是泰兴市滨江污水处理厂（二期）工艺设计，设计处理水量为30000m³/d。

通过资料调研和工艺方案比较，选用A²/O工艺^[1]作为本方案的主体工艺。A²/O工艺系统运行稳定，处理效果显著，广泛运用于城市污水处理厂的工艺设计。

该污水处理厂的进水水质参数为：pH为6-10，COD浓度为450mg/L，BOD₅ 浓度为250 mg/L，SS浓度为250 mg/L，NH₃-N浓度为35 mg/L，TN浓度为45mg/L，TP浓度为4mg/L。处理要求：满足《城镇污水处理厂污染物排放标准》（GB 18918—2002）中的一级A标准：pH 6-9，COD ≤50mg/L，BOD₅ ≤10mg/L，SS ≤10mg/L，NH₃-N≤5（8）mg/L，TN≤15mg/L ，TP≤0.5mg/L，粪大肠菌群数≤个/L。

本污水处理厂设计运行流程为：污水首先通过粗格栅去除较大的漂浮物，过滤后续工段无法去除的杂物。经提升泵提升，旋流沉砂池去除无机物后，与回流污泥一同进入A²/O系统进行生化反应降解，之后污水进入二沉池进行泥水分离，最后经过物化除磷以及紫外线消毒处理，水质达标后排放^[2]。本工程设计主要根据选择的处理工艺流程，按照规范，进行详细工艺计算以及工程概预算。再根据具体设计内容，进行工程施工图设计。二沉池一部分污泥回流至厌氧区，另一部分剩余污泥泵至集泥井，最后经过带式浓缩脱水一体机的处理，挤压脱水后，外运至污泥填埋厂填埋处理。

工程要求污水处理后出水水质达到《城镇污水处理厂污染物排放标准》（GB18918-2002）一级A标准。

关键词：污水处理；A²/O；工艺流程；污染物

The Design of Binjiang Wastewater Treatment Plant

(Second Phase) in Taixing

Abstract

Due to the expansion of the city scale of Taixing City, the number of resident population has increased dramatically, and the existing wastewater treatment capacity cannot meet the needs of urban development, so it is urgent to expand capacity. The task of this graduation project is the process design of the Binjiang Wastewater Treatment Plant (Phase II) of Taixing City, with a designed treatment volume of 30000m³/d.

Through the comparison of data research and process plans, the A²/O process ^[1] was chosen as the main process of this project. The characteristic of A²/O process is to use activated sludge method to combine biological nitrification, denitrification and biological phosphorus removal technology. The system is stable in operation and has remarkable treatment effect. It is widely used in the process design of urban sewage treatment plant.

The parameter of the inlet water quality in this plant is as following: pH is between 6 and 10, COD concentration is 450mg/L, BOD₅ concentration is 250mg/L, SS concentration is 250mg/L, NH₃-N concentration is 35mg/L, TN concentration is 45mg/L, TP concentration is 4mg/L. The treatment requirements are as following: meet the first level A standard in the Urban sewage treatment plant emission standards(GB 18918—2002): pH 6-9，COD≤50mg/L，BOD₅≤10mg/L，SS≤10mg/L，NH₃-N≤5（8）mg/L，TN≤15mg/L, TP≤0.5mg/L，Fecal coliform number≤10³/L.

The design and operation flow of the sewage treatment plant is as follows: The sewage first passes through the coarse grid to remove large floating objects, and filters debris that cannot be removed in subsequent sections. After being lifted by the lift pump, the cyclone grit chamber removes the inorganic matter and enters the A²/O system for biochemical reaction and degradation together with the return sludge. After that, the sewage enters the secondary settling tank for sludge separation, finally undergoes physical and chemical phosphorus removal and UV disinfection. Emission after water quality standards ^[2]. This project design is mainly based on the selected process flow, in accordance with the specifications, detailed process calculations and project budget. Then according to the specific design content, the engineering construction drawing design. A part of the sludge in the secondary settling tank is returned to the anaerobic zone, and the other part of the excess sludge is pumped to the settling well. Finally, it is treated by a belt type dehydration and dehydration integrated machine. After being squeezed and dewatered, it is transported to the sludge landfill site for landfill treatment .

It is stipulated that the quality of the effluent after the sewage treatment meets the Class A standard of the "Emission Standard of Pollutants for Municipal Wastewater Treatment Plants" (GB18918-2002).

KEY WORLDS: Wastewater treatment; A²/O; process flow; pollutant

目录

摘 要 I

Abstract I

第一章 设计任务概况 1

1.1 项目介绍 1

1.2 设计原始资料 1

1.2.1 设计水量 1

1.2.2 设计进出水水质 1

1.3 设计要求、依据及原则 2

1.3.1 设计要求 2

1.3.2 设计依据 2

1.3.3 设计原则 2

第二章 工艺比选及确定 4

2.1 常用污水处理工艺 4

2.1.1厌氧生物处理工艺 4

2.1.2 A²/O工艺 5

2.1.3 氧化沟工艺 5

2.1.4 SBR工艺 6

2.2 工艺流程确定 7

2.2.1 工艺比较 7

2.2.2 工艺流程 7

2.2.3 工艺流程介绍说明 9

第三章 设计计算 10

3.1 格栅 10

3.1.1 粗格栅 10

3.1.2 细格栅 11

3.2 提升泵房 14

3.2.1 提升泵 14

3.2.2 集水池 15

3.3 沉砂池 15

3.3.1 设计要点 15

3.3.2 设计计算 16

3.4 A²/O系统 17

3.4.1设计参数 17

3.4.2设计计算 18

3.4.3曝气量计算 21

3.5 二沉池 25

3.5.1 二沉池说明 25

3.5.2 二沉池计算 25

3.6混凝反应池 29

3.6.1 设计说明 29

3.6.2反应池尺寸 29

3.6.3加药机的选择 30

3.7 混凝沉淀池 30

3.7.1 混凝沉淀池说明 30

3.7.2 混凝沉淀池计算 30

3.8砂滤池 33

3.9 消毒渠 34

3.9.1 消毒渠设计说明 34

3.9.2 设计计算 34

3.10污泥处理 35

3.10.1 浓缩脱水机 36

3.10.2污泥回流泵房 36

第四章 平面布置和高程布置 38

4.1 平面布置 38

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