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华北理工大学轻工学院

Qing Gong College North China University of Science and Technology

毕业设计说明书

设计题目：20万m3/d生活污水氧化沟处理工艺设计

学生姓名：邱光兆 学 号：201224040113 专业班级：12环境工程1班 学 部：材料化工部 指导教师：李娟娟

2016年5月15日

摘 要

本次毕业设计的题目为某污水处理厂设计——氧化沟工艺。主要任务是工艺流程选择及构筑物设计和计算。本污水处理厂主体处理系统分为两个部分污水处理系统和污泥处理系统，污水处理系统包括：格栅、污水提升泵站、曝气沉砂池、鼓风机房、配水井、氧化沟、接触消毒池与加氯间。污泥处理系统包括：污泥浓缩池、污泥脱水机房。污水处理工艺流程为污水先到粗格栅，通过污水提升泵到细格栅，再到曝气沉砂池通过配水井到三槽式氧化沟，通过接触消毒池后出水。污泥处理工艺流程为：氧化沟中的污泥到达浓缩池经脱水机房，最后泥外运。设计进水水质为：BOD5=260mg/L，COD=400mg/L，SS=380mg/L，TN=50mg/L，TP=8mg/L；设计出水水质为：BOD5≤30mg/L，COD≤100mg/L，SS≤30mg/L，TN≤25mg/L，TP≤3.0mg/L，即污水处理厂出水水质要求达到国家《污水综合排放标准（GB8978-2002）》中二级标准。

关键词：三槽式氧化沟；生活污水；污泥处理

I

Abstract

The graduation design topic for a sewage treatment plant design - oxidation ditch process. Main task is to process selection and structure design and calculation. This sewage treatment plant main processing system is divided into two parts of the sewage treatment system and sludge treatment system, sewage treatment system include: grille, sewage pumping station, aerated grit chamber, blower room, match well, oxidation ditch, the contact between chlorine disinfection pool. Sludge treatment systems include: the sludge thickener and sludge dewatering machine room. Wastewater treatment process for wastewater to coarse grid, first by sewage lift pump to fine screen, and then to aerated grit chamber through the Wells to three slot type oxidation ditch, through contact disinfection after the pool water. In the sludge treatment process is: the oxidation ditch arrive sludge thickener dewatering machine room, finally sinotrans mud. Design the water quality is: the BOD = 260 mg/L, COD = 400 mg/L, SS = 380 mg/L, TN = 50 mg/L, TP = 8 mg/L; Design for discharging water, BOD 30 mg/L, or less COD acuities were 100 mg/L, SS 30 mg/L, or less TN acuities were 25 mg/L, TP 3.0 mg/L or less, the sewage treatment plant effluent water quality

requirements

meet

the

national

\

wastewater

dischargestandard(GB8978-2002)\

Key words: three slot oxidation ditch; Wastewater; Sludge treatment.

II

目录

摘 要............................................................................................................................................ I Abstract ............................................................................................................................................ II 引言 .................................................................................................................................................. 1 1 概述 .............................................................................................................................................. 2

1.1 设计任务和依据 ................................................................................................................ 2 1.2 设计要求 ............................................................................................................................ 2 1.3 设计参数 ............................................................................................................................ 2 2 生活污水处理工艺比较与确定 ................................................................................................... 4

2.1传统活性污泥法 ................................................................................................................. 4 2.2 SBR工艺 ............................................................................................................................ 4 2.3氧化沟 ................................................................................................................................. 6 2.4 工艺的确定 ........................................................................................................................ 9 3 设计计算..................................................................................................................................... 10

3.1 格栅 .................................................................................................................................. 10 3.2污水泵房 ........................................................................................................................... 15 3.3 沉砂池 .............................................................................................................................. 17 3.4配水井设计计算 ............................................................................................................... 21 3.5 三槽式氧化沟 .................................................................................................................. 22 3.6 消毒设施 .......................................................................................................................... 27 3.7 污泥处理系统 .................................................................................................................. 29 4 污水厂平面布置 ......................................................................................................................... 33

4.1 平面布置原则 .................................................................................................................. 33 4.2 平面布置 .......................................................................................................................... 33 5 污水高程布置 ............................................................................................................................. 35

5.1 高程布置任务 .................................................................................................................. 35 5.2 高程布置考虑事项 .......................................................................................................... 35 5.3 构筑物间的确定 .............................................................................................................. 35 5.4 高程布置设计计算 .......................................................................................................... 35 6 系统与仪表 ................................................................................................................................. 38

6.1 变配电系统 ..................................................................................................................... 38 6.2 仪表的设计 ...................................................................................................................... 38 7 工程概预算及运行管理 ............................................................................................................. 39

7.1 生产组织 ......................................................................................................................... 39 7.2 人员编制 .......................................................................................................................... 39 7.3 安全生产和劳动保护 ...................................................................................................... 39 7.4 工程概算 .......................................................................................................................... 40 7.5 安全措施 .......................................................................................................................... 40

7.6 污水厂运行管理 .............................................................................................................. 41 7.7 污水厂运行中注意事项 .................................................................................................. 41 参考文献......................................................................................................................................... 42