论文总字数：28458字

摘 要

针对广东省东莞某镇生活污水排放量、水质状况、当地水文地质和气象特点，并结合该地区经济社会发展水平以及中长期发展规划，本工程设计的主要任务和目标是设计1座处理能力（规模）为12万m³/d的污水处理厂,处理后的出水水质指标符合国家污水处理综合排放一级A标准。首先仔细分析了目前国内外主要污水处理工艺技术和有关已建典型工程，主要比较了普通活性污泥法、氧化沟法、A/O法、SBR法和A²/O法处理工艺的优缺点，然后根据处理规模、进出水水质指标，设计推荐采用A²/O污水处理工艺流程。本工程设计工艺流程把除磷脱氮作为重点，依据相关技术规范，对工艺流程各个环节涉及的参数进行了计算分析，设计指标符合要求。

本设计在A²/O污水处理工艺流程参数计算中，充分考虑主要构筑物厌氧池、缺氧池和好氧池布局和规模的合理性，在主要设备选型方面，即先进实用，又经济合理，在满足设计指标和工程质量的前提下，尽量节约建设资金。本设计A²/O工艺出水能够达到了排放标准要求，具有处理广东东莞某镇生活污水的能力。该污水处理厂的建设，将具有显著地环境效益、社会效益，对促进区域高质量发展，保持良好环境具有重要作用。

关键词： 污水 处理 设计 除磷 脱氮 A²/O工艺

ABSTRACT

In view of the domestic sewage discharge, water quality, local hydrogeology and meteorological characteristics of a town in Dongguan, Guangdong Province. The level of economic and social development in the region, together with a long -term development plan, is the main objective of this project, which is the 12 million m3 /d waste water treatment plant. The treated effluent quality index meets the national comprehensive sewage treatment discharge. Level A standard. Firstly, the main sewage treatment technologies and typical projects at home and abroad are carefully analyzed, and the advantages and disadvantages of common activated sludge process, oxidation ditch process, A/O process, SBR process and A2/O process are mainly compared. and then, according to the treatment of volume and water quality index, a2 / o process for waste water treatment is recommended. The technical design of nitrogen and phosphorus is removed as a focus. According to the relevant technical specifications, the parameters involved in each link of the process are calculated and analyzed, and the design indicators meet the requirements.

In the calculation of A2/O wastewater treatment process parameters, the rationality of layout and scale of anaerobic, anoxic and aerobic tanks of main structures is fully considered. In the selection of main equipment, which is advanced, practical and economical, the construction funds are saved as much as possible on the premise of meeting design targets and engineering quality. The design of A2/O process effluent can meet the requirements of discharge standards, and has the ability to treat domestic sewage in a town in Dongguan, Guangdong Province. The construction of the sewage treatment plant will have significant environmental and social benefits, and play an important role in promoting regional high-quality development and maintaining a good environment.

Keywords：Nitrogen； Except for Phosphorus； A²/O 's technology ； Sewage

目 录

第一章 设计任务及主要资料………………………………………………………5

1.1设计任务…………………………………………………………………………5

1.2设计主要内容……………………………………………………………………5

1.3本污水处理厂规模和水质设计主要数据………………………………………5

1.4本毕业设计主要工作……………………………………………………………5

1.5本设计前期准备工作……………………………………………………………6

1.5.1本设计的目的和意义…………………………………………………………6

1.5.2国内污水处理工艺技术概况…………………………………………………6

1.6主要污水处理工艺技术特点……………………………………………………6

1.6.1氧化沟工艺……………………………………………………………………6

1.6.2传统活性污泥法………………………………………………………………7

1.6.3 SBR工艺………………………………………………………………………7

1.6.4 A/O工艺………………………………………………………………………8

1.6.5A²/O工艺………………………………………………………………………8

第二章 污水处理厂技术参数设计计算……………………………………………9

2.1一级处理…………………………………………………………………………9

2.1.1粗格栅…………………………………………………………………………9

2.1.2 提升泵房……………………………………………………………………11

2.1.3 细格栅………………………………………………………………………12

2.1.4 配水井………………………………………………………………………14

2.1.5 竖流沉砂池…………………………………………………………………16

2.1.6 初次沉淀池…………………………………………………………………18

2.2 二级处理………………………………………………………………………20

2.2.1 A²/O工艺……………………………………………………………………20

2.2.2 A²/O设计……………………………………………………………………21

2.2.3 空气管系统计算……………………………………………………………25

2.3 三级处理………………………………………………………………………25

2.3.1膜生物反应器（MBR)…………………………………………………………26

2.3.2 紫外线消毒…………………………………………………………………26

2.3.3 巴氏计量槽…………………………………………………………………27

第三章 污泥处理构筑物设计……………………………………………………28

3.1 污泥处理工艺的选择…………………………………………………………28

3.2 污泥浓缩和脱水………………………………………………………………28

3.2.1 泵房…………………………………………………………………………28

3.2.2 剩余污泥量的计算…………………………………………………………28

3.2.3 初沉池剩余污泥量…………………………………………………………29

3.2.4 泵的选型……………………………………………………………………29

3.2.5 浓缩池………………………………………………………………………29

3.2.6 中心进泥管面积……………………………………………………………29

3.2.7 中心进泥管喇叭口与反射板之间的缝隙高度……………………………29

3.2.8 浓缩后分离出的污水量……………………………………………………30

3.2.9 浓缩池水流部分面积………………………………………………………30

3.2.10 浓缩池直径………………………………………………………………30

3.2.11 有效水深…………………………………………………………………30

3.2.12 浓缩后剩余污泥量………………………………………………………30

3.2.13 浓缩池污泥斗容积………………………………………………………30

3.2.14 污泥在污泥斗中停留时间………………………………………………31

3.2.15 浓缩池总高度 ……………………………………………………………31

3.2.16 溢流堰……………………………………………………………………31

3.2.17 浓缩池的尺寸……………………………………………………………31

3.3 脱水机房………………………………………………………………………31

3.3.1 脱水后污泥量………………………………………………………………31

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