毕业设计_10万方污水处理厂的-(初步设计说明书)

湖北民族学院学士学位论文

HUBEI UNIVERSITY FOR NATIONALITIES

学士学位论文

A城市100000m/d污水处理厂的初步设计

院 系 化学与环境工程学院 专 业 环境科学 姓 名 吴灵进 学 号 0406314 指导老师 史永红

3日 期 2010年5月

湖北民族学院学士学位论文

摘 要

本设计是A城市污水处理厂的工艺流程和施工图的初步设计。该污水处理厂总设计处理能力100000m3/d。由于进水水质较为复杂，进水中的BOD：N：P=67：11：1，污水经二级生物处理后，氮、磷将难以达到规定排放标准，必须同时进行脱氮除磷处理。根据设计要求和求新的思想，为满足在去除BOD、COD和SS的同时还必需脱氮除磷，故决定选用当代水处理工艺中较流行的A/A/O工艺方案。工艺流程为：“中格栅——进水泵房——细格栅——涡流沉砂池——A/A/O生物池——二次沉淀池——接触消毒池”。该工艺综合了以往工艺的优点，同时该工艺具有高效，节能的特点，且耐冲击负荷高，可获得优质出水，是一种深度二级处理工艺，因此具有广泛的适用性。根据国内众多城市污水处理厂运行结果显示，A/A/O工艺处理出水一般可达到《中华人民共和国国家标准——污水综合排放标准》(GB8978—1996)中的一级排放标准，能够确保城市周边农业用水和河流水体的要求。

关键词：A/A/O工艺，城市生活污水，二次沉淀池，污泥处理，出水水质

I

湖北民族学院学士学位论文

ABSTRACT

This design is a preliminary design of a process of A urban sewage treatment plant and its construction drawings. The total design processing capacity of sewage is 100000m3/d. Because of the complex water in which its BOD: N: P = 67:11:1, Sewage water, after second biological treatment, its nitrogen and phosphorus is difficult to achieve the prescribed discharge standards, so the nitrogen and phosphorus must be processed simultaneously. According to design requirements and the novelty of ideas, to meet in the removal of BOD, COD and SS, nitrogen and phosphorus removal is also necessary, it was decided to use modern water treatment processes of the more popular A / A / O process plan. The technological process is: \Medium-sized grid ——The water pump——Fine grid——First sank sand leaking——A/A/O biological pool——Radiant flow secondary sedimentation pool——Disinfectant pool of contact form\process comprehend its previous processes, and this process is efficient, energy-saving, and impact-resistant and its load is high, which can get good quality water, it is a kind of deep water treatment processing, thus A/A/O process has extensive applicability. According to many domestic sewage treatment plant operation results, A /A / O process of dealing with the water can usually reach \standard - Integrated Wastewater Discharge Standard\(GB8978-1996) in the level of emissions standards and ensure that the city surrounding agricultural water and river water requirements.

Key words: A / A / O process; Municipal living sewage; Secondary sedimentation pool;

Sludge treatment; Quality of effluent water

II

湖北民族学院学士学位论文

目 录

摘 要 ···························································································· Ⅰ Abstract ···························································································· Ⅱ 1 总 论 ························································································· 1

1.1 项目提出的背景及投资的必要性 ·················································· 1 1.2 A城市环境条件的基本概括 ························································· 1

1.2.1 自然地理 ········································································ 1 1.2.2 气象水文 ········································································ 2 1.3 A城市污水排放现状 ·································································· 2

1.3.1 A城市污水排放量 ···························································· 2 1.3.2 A城市污水水质现状 ························································· 3 1.4 污水处理厂的设计任务与治理目标 ··············································· 3

1.4.1 污水处理厂设计任务 ························································· 3 1.4.2 污水处理厂进出水的水质指标 ············································ 3 1.5 设计要求 ················································································· 3

1.5.1 污水处理厂的建设依据······················································ 3 1.5.2 污水处理厂的建设原则······················································ 4

2 A城市污水处理工艺流程及说明 ··················································· 5

2.1 污水处理工艺方案的分析 ···························································· 5

2.1.1 AB法(Adsorption Bioderadation) ·········································· 5 2.1.2 SBR法(Sequencing Batch Reactor) ········································ 5 2.1.3 A/A/O法(Anaerobic Anoxic Oxic) ········································ 6 2.1.4 奥贝尔(Orbal)氧化沟工艺 ·················································· 7 2.2 污水处理工艺方案的确定 ···························································· 8

2.2.1 A城市污水处理特点 ························································· 8 2.2.2 给出适合A城市的方案······················································ 8 2.2.3 A城市污水处理工艺流程图 ················································ 9 2.3 污水处理流程构筑物 ·································································· 9

2.3.1 格栅 ·············································································· 9 2.3.2 旋流沉砂池 ··································································· 10 2.3.3 A/A/O生物化反应池 ······················································· 11 2.3.4 二次沉淀池 ··································································· 12 2.3.5 消毒投氯池 ··································································· 12 2.3.6 污泥浓缩池 ··································································· 13 2.3.7 污泥硝化池 ··································································· 13

III

湖北民族学院学士学位论文

2.3.8 污泥脱水房 ··································································· 13

3 A城市污水处理工艺设计计算 ····················································· 15

3.1 污水一级处理系统 ··································································· 15

3.1.1 中格栅 ········································································· 15 3.1.2 污水提升泵房 ································································ 19 3.1.3 细栅格 ········································································ 21 3.1.4 旋流沉砂池 ·································································· 24 3.2 污水深度二级处理 ··································································· 26

3.2.1 A2/O生物化反应池 ·························································· 26 3.2.2 生化反应池曝气计算 ······················································· 28 3.2.3 生化反应池设备选择 ······················································· 30 3.2.4 二次沉淀池 ··································································· 32 3.2.5 液氯消毒池 ··································································· 36 3.3 污泥处理系统 ········································································· 36

3.3.1 污泥浓缩池 ··································································· 36 3.3.2 污泥消化池 ··································································· 39

4 污水处理厂总体布置 ·································································· 41

4.1 总平面布置 ············································································ 41

4.1.1 总平面布置原则 ····························································· 41 4.1.2 总平面布置规划 ····························································· 41 4.2 高程布置 ··············································································· 41

4.2.1 高程布置原则 ································································ 41 4.2.2 高程布置规划 ································································ 42

结 论 ··························································································· 43 参考文献 ························································································· 44 致 谢 ···························································································· 46

IV