毕业论文关键词： A+A2/O工艺;碱解联合高压均质破解;二级厌氧消化;一级A标准;能源自给

Abstract With the development of morden industry and city construction, theenvironmental pollution, especially the problem of water pollution in the city in our country has been increasingly serious, meanwhile the problem of water resourse has been increasingly serious as well. There are several problems of the high-speed developing wastewater treatment industry in our country such as large energy consumption,low resource utilization and effluent quality bing hard to meet the needs of water resource and water environment. The problem of energy consumption has been particularly outstanding among them. Recently, “Chinese concept wastewater treatment plant ” has been raised. Therefore, developing the wastewater treatment process which is based on energy recycling and aiming for optimizing the energy balance, improving effluent quality and achieving sludge reclamation, keeps up to date with technological trends of contemporary wastewater treatment. And it is of vital importance to the sustainable development of our country.

In this design, the removal rate of BOD5, CODCr, SS, NH3-N, TN and TP can reach 55%, 60%, 70%, 40%, 35% and 40% in A step. And the removal rate of BOD5, CODCr, SS, NH3-N, TN and TP can reach 91.1%, 75%, 81%, 58.3%, 78% and 77.2% in A2/O process. After reasonable designing and calculating, the gas generation amount of anaerobic digestion reachs up to 16027m3/d, including 10738m3/d methan gas generation amount. And the rate of energy self-sufficiency reachs up to 161.2%, the energy self-sufficiency of the wastewater treatment plant can be realized sufficiently. Project total investment budget is 2.02 billion RMB and annual operation cost is 6.2022 million RMB. To estimate the engineering investment recovery period is 8.78 years.

Keywords: A+A2/O process, Combined pretreatment of alkaline and high pressure homogenization+，Two-phase anaerobic sludge digestion，Standard A of the first class，Energy self-sufficiency

目录

1 绪论 1

1.1概述 1

1.2设计的主要内容 1

2 废水处理厂设计计算 3

2.1设计废水水量 3

2.2废水处理程度计算 3

2.3 处理工艺的比较与选择 3

2.3.1进水有机物高效去除方案比选 3

2.3.2 废水二级处理工艺比选 4

2.3.3 污泥水解酸化方案比选 6

2.3.4 污泥破解技术比选 6

2.3.5 确定设计方案即工艺流程 7

2.4 废水的一级处理构筑物设计计算 8

2.4.1格栅 8

2.4.2沉砂池 12

2.5 废水二级处理构筑物设计计算 15

2.5.1 A段生物吸附池 15

2.5.2 A段中沉池 20

2.5.3 A2/O反应池 21

2.5.4 二沉池 23

2.5.5 污泥水解酸化设计计算 24

2.5.6 紫外线消毒间 25

2.6 污泥处理构筑物计算 26

2.6.1 A段剩余污泥预浓缩池 27

2.6.2 A段污泥贮泥池设计计算