本设计是江苏省沭阳经济开发区城北工业污水处理工程的初步设计。
污水处理厂处理规模为期9万m³/d ，设计进水水质为：悬浮物（SS）：250mg/L；五日生化需氧量（BOD5）：250mg/L；化学需氧量（CODcr）：300mg/L；总氮（TN）：40mg/L；总磷（TP）：4.0mg/L；出水水质达到《城镇污水处理厂污染物排放标准》（GB18919-2002）中的一级A标准，即：悬浮物（SS）≤10mg/L；日生化需氧量（BOD5）≤10mg/L；化学需氧量（CODcr）≤10mg/L；总氮（TN）≤15mg/L；总磷（TP）≤0.5mg/L；氨氮（NH3-N）≤5mg/L。
设计进水水质氮含量较高，因此在设计处理工艺是还需要考虑脱氮除磷技术，由于污水厂规模较小，污水日变化量较大，因此，在设计过程中选择适应该情况的氧化沟工艺。在氧化沟前添加厌氧池，以提高除磷效果。实现出水水质达标且稳定的目的。
本次设计的主要构筑物包括粗格栅、提升泵房、旋流式沉砂池、水解酸化池，改良倒置A2/O工艺氧化沟、辐流式二沉池、紫外消毒池、污泥回流泵房、脱水机房等。市政污水管网收集的污水经中格栅拦截较大的悬浮物和漂浮物后，由污水泵房提升至细格栅和旋流式沉砂池去除比重较大的无机颗粒，在经过厌氧池后再通过氧化沟，以去除大量的有机物，同时达到脱氮除磷的效果。处理后的污水在辐流式二沉池内进行泥水分离，再经过V型滤池进一步去除SS,后经消毒后排放。污泥回流比为50%，其余的由污泥脱水机房浓缩脱水后外运。
本次设计污水厂占地6公顷。 设计中省略了初次沉淀池，节省了基建和运行费用。氧化沟表面曝气设备简单，管理方便，且出水较为稳定，做到了水资源的合理利用。
目录
第一章 总论·································································1
1.1 编制依据·····························································1
1.2 编制原则·····························································1
1.3 采用的标准规范·······················································2
1.4 城市概况·····························································3
1.4.1 自然条件························································3
1.4.2 社会条件························································4
1.5 城市排水现状·························································5
1.5.1 城市排水现状及存在的问题········································5
1.5.2 排水体制的比较··················································5
1.6 项目建设的必要性和可能性·············································6
1.6.1 项目建设的必要性················································6
1.6.2 项目建设的可能性················································7
第二章 工程规模及出水水质···················································8
2.1 进水水质及处理程度···················································8
2.1.1 进水水质预测····················································8
2.1.2 进水水质确定····················································9
2.1.3 污水厂出水水质的确定············································9
2.1.4 污水处理厂的处理程度···········································10
2.2 处理后尾水的处理····················································10
第三章 污水处理工艺选择····················································11
3.1 工艺技术的方案选择··················································11
3.1.1 污水处理原理概述···············································11
3.1.2 工艺技术方案选择原则···········································11
3.1.3 工艺技术方案选择···············································11
3.2 生化处理工艺························································12
3.3 污水消毒工艺························································15
3.4 污泥处理工艺及流程··················································16
3.4.1 污泥处理工艺概述···············································16
3.4.2 污泥处理工艺选择···············································16
3.4.3 污泥浓缩脱水处理方案比较·······································17
第四章 建厂条件和厂址方案··················································18
4.1 厂区平面设计························································18
4.1.1 厂区平面设计原则···············································18
4.1.2 厂区平面设计···················································18
4.2 厂区高程设计························································18
4.3 厂区管网设计························································18
4.3.1 总进水管设计···················································19
4.3.2 超越管道设计···················································19
4.3.3 工艺水管·······················································19
4.3.4 厂区污泥管道设计···············································19
4.3.5 尾水排放管设计·················································19
4.3.6 给水及消防设计·················································19
4.3.7 厂区污水管设计·················································20
4.3.8 厂区雨水排放设计···············································20
4.3.9 厂区通讯线路设计···············································20
4.3.10管道接口·······················································20
4.3.11管道基础·······················································20
4.3.12沟槽回填·······················································20
4.3.13管道防腐·······················································20
第五章 工程方案设计························································21
5.1 总图运输····························································21
5.1.1 概述···························································21
5.1.2 功能分区·······················································21
5.1.3 厂区平面设计···················································21
5.2 主要处理构筑物工艺设计··············································21
5.2.1 粗格栅·························································21
5.2.2 污水提升泵站···················································23
5.2.3 流量计井·······················································24
5.2.4 细格栅及旋流沉砂池·············································24
5.2.5 沉砂池·························································26
5.2.6 生化水解池·····················································27
5.2.7 倒置AAO生化反应池············································28
5.2.8 二沉池·························································32
5.2.10紫外线消毒池···················································32
第六章 污水厂高程布置计算 ·················································33
6.1 污水处理构筑物高程布置··············································33
6.1.1 水头损失计算 ··················································34
6.1.2 管渠水力计算···················································34
第七章 污水处理厂平面布置··················································35
7.1.1 构筑物组成·····················································35
7.2.1 平面布置························································35
7.3.1 道路布置·······················································35
7.4.1 绿化布置························································35
