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摘 要水是人类的生命之源。水污染危害人体健康、渔业和农业生产，还会
对生态系统造成危害，所以对水污染治理是势在必行的。本设计是辽宁省沈阳市的城市排水工程。本设计的目的是缓解当地城市发展与环境保护之间的矛盾，改善居民生活环境，提高城市形象。设计内容包括城市排水管网系统的设计、城市污水处理厂的设计和投资估算与技术经济评价。
排水管网系统共设计了A和B两套方案，经过技术经济比较，选择B方案。根据城市所处的地理位置和污水厂的规模，并结合考虑需脱氮除磷的要求，城市污水处理厂设计采用倒置A2/O（RAAO）工艺。该工艺污水处理流程为：粗格栅→泵房→细格栅→钟式沉砂池→初沉池→缺氧池→厌氧池→好氧池→二沉池→消毒池→巴氏计量堰→出水排放。通过此工艺的处理，出水水质将达到《城镇污水处理厂污染物排放标准》（GB18918-2002）一级B标准。
关键词 城市排水管网；污水处理厂；倒置A2/O工艺；脱氮除磷；污泥处理
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Abstract
Water is described as the essential natural resources in people’s life. Water pollution is hazardous to human’s health, fishery and agriculture, and also can be harmful to eco-system. Thus, it is imperative to control water pollution.This projection is a drainage system of Shenyang, Liaoning Province. It aims to protect the residential environment and enhance the city image. Design of urban drainage pipeline network, design of the urban sewage treatment plant, investment estimate and technical and economic evalua-tion of the sewage treatment plant are included in this projection.
Two sets of schemes of the drainage pipeline network are designed altogether. After compared in technical and economic aspects, scheme B is choosen.According to the city’s geographical position and scale of the sevage treatment plant, combining with the demand of denitrification and dephosphorization in the treatment process, the sewage treatment plant is designed as RAAO technology. The sewage disposal procedure is: the coarse grille→the pumping station→the fine grille→the grit pool→the preliminary set-tling tank→the anoxc pool→the anaerobic pool→the oxic pool→the secondary settling tank→the disinfection tank→Parshall flume→discharged into the river. After the treat-ment of this technology, the quality of water disposed will reach the first class B standard of《pollutant discharge standard of urban sewage treatment plant 》(GB18918-2002 ).
Keywords：urban drainage pipeline networks, urban sewage treatment plant, RAAO, denitrification and dephosphorization, sludge treatment
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目 录
摘 要 ................................................................................................................. I Abstract .............................................................................................................. II 第1章 绪论 ....................................................................................................... 1 1.1 概述 ...................................................................................................................... 1
1.1.1 城市概况..................................................................................................... 1 1.1.2 设计范围..................................................................................................... 1 1.1.3 设计任务..................................................................................................... 1 1.2 设计资料 .............................................................................................................. 2
1.2.1 地形与城市规划资料................................................................................. 2 1.2.2 气象资料..................................................................................................... 2 1.2.3 地质资料..................................................................................................... 3 1.2.4 受纳水体水文与水质资料......................................................................... 3
第2章 排水管网的规划设计 ............................................................................. 4 2.1 城市排水管网定线原则 ...................................................................................... 4
2.1.1 排水工程规划设计的基本原则................................................................. 4 2.1.2 排水管网的管道定线原则......................................................................... 5 2.2 排水体制确定及区域划分 .................................................................................. 5
2.2.1 排水体制的选择......................................................................................... 5 2.2.2 排水区域的划分......................................................................................... 6 2.3 排水系统的布置形式 .......................................................................................... 6 2.4 污水管网设计计算 .............................................................................................. 7
2.4.1 水量计算公式............................................................................................. 7 2.4.2 污水管网的水力计算................................................................................. 8 2.5 计算机计算说明 .................................................................................................. 8 2.6 污水管道水力计算的设计数据 ........................................................................ 10
2.6.1 基本原则................................................................................................... 10 2.6.2 污水管道水力计算时应注意的问题....................................................... 11 2.7 污水管道水力计算结果 .................................................................................... 11 第3章 雨水管渠设计 ...................................................................................... 13
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3.1 雨水管渠系统平面布置的原则 ........................................................................ 13 3.2 雨水管渠设计流量的确定 ................................................................................ 13
3.2.1 暴雨强度公式的确定............................................................................... 13 3.2.2 雨水管渠设计流量计算公式................................................................... 14 3.2.3 径流系数ψ的确定 .................................................................................. 14 3.3 雨水管渠的水力计算 ........................................................................................ 15
3.3.1 雨水管渠水力计算的设计数据............................................................... 15 3.3.2 雨水管渠水力计算的方法....................................................................... 15
第4章 污水处理厂设计初步 ........................................................................... 17 4.1 设计方案的选择 ................................................................................................ 17 4.2 污水设计流量 .................................................................................................... 19 4.3 污水水质污染程度计算 .................................................................................... 19
4.3.1 污水的SS处理程度计算......................................................................... 20 4.3.2 污水的BOD处理程度计算 .................................................................... 21 4.3.3 污水的总氮处理程度计算....................................................................... 24 4.3.4 污水的磷酸盐处理程度计算................................................................... 25
第5章 污水的一级处理 .................................................................................. 26 5.1 格栅的设计计算 ................................................................................................ 26 5.2 沉沙池的设计计算 ............................................................................................ 29
5.2.1 池型选择................................................................................................... 29 5.2.2 排砂设计................................................................................................... 30 5.2.3 进、出水设计........................................................................................... 31 5.3 初沉池的设计计算 ............................................................................................ 31
5.3.1 沉淀池池体设计计算............................................................................... 31 5.3.2 进水集配水井设计................................................................................... 34
第6章 污水的二级处理—倒置A2/O工艺 ....................................................... 37 6.1 二级处理进出水水质 ........................................................................................ 37 6.2 倒置A2/O工艺流程图 ..................................................................................... 37 6.3 基本参数 ............................................................................................................ 37 6.4 缺氧池计算 ........................................................................................................ 39
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整理倒置A2O工艺.doc
