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In accordance with the established process, the design calculated the main dimensions, the hydraulic losses and pipeline of structures (including the grating, grit chamber Dole, with wells, three groove-type oxidation ditch, etc.) anhd finished the instrocution of the design process , Process Flow Diagram (including high-level-floor layout), factory floor layout and map the main monomer structure.
The process of triple oxidation ditch has special advantage compared with others biochemical process. It could remove the organics and total nitrogen in the same ditch, so this process is widely used in domestic and overseas. Used the process of triple oxidation ditch to dispose sewage can get satisfactory effect.
The design finished whole treatment of the sewage by gravity flow after an upgraded waste water by the pump. It avoided repeating sewage upgrade to reduce power consumption and reduce the cost of wastewater treatment to facilitate the operation and management. The whole process was designed to effectively save the project investments, reduce processing costs, reduce the space. It had the advantages of less total investment, stable operation, less secondary pollution to ensure the treatment of waste-water fitting the standards, having a good results, a simple process, less space and low power consumption.
The treated wastewater is expected to achieve "urban sewage treatment plant emission standards for pollutants" (GB18918-2002), emission standards at the national level, that is : CODcr ≤ 60mg / l, BOD5 ≤ 20 mg / l, pH = 6 - 9, SS ≤ 20mg / l, ammonia nitrogen ≤ 8mg / l.
Key words: wastewater treatment; three groove-type oxidation ditch; CODcr
目录
1 绪论 1
1.1 设计背景 1
1.2 设计规模 2
1.3 设计依据与原则 2
1.3.1 设计依据 2
1.3.2 设计原则 2
2 污水处理工艺的选择 4
2.1 进水水质分析特点和水质要求 6
2.1.1 污水的可生化性 7
2.1.2 碳氮比 8
2.1.3 预计处理效果 8
2.2 水处理方法的分类 4
2.2.1 按污染物的性质分类 4
2.2.2 按照废水处理程度划分 4
2.3 污水处理厂工艺流程比较 4
2.3.1 A/O法工艺 4
2.3.2 A2O法工艺 5
2.3.3 SBR法工艺 6
2.3.4 生物接触氧化法工艺 7
2.3.3氧化沟工艺 8
2.3.4 方案的比较 9
2.4 污水处理工艺方案的确定 13
3 设计说明 17
3.1 工艺说明 17
3.1.1 粗格栅及提升泵房 17
3.1.2 配水井 17
3.1.3 曝气沉砂池 17
3.1.4 三槽式氧化沟 18
3.1.5 污泥浓缩池 18
3.2 设计计算 20
3.2.1 格栅 20
3.2.2 配水井 22
3.2.3 曝气沉砂池 23
3.2.4 三槽式氧化沟 25
3.2.5 污泥浓缩池 31
3.2.7管路计算与选型 33
3.2.8高程布置 34
4 劳动定员及工程技术经济分析 37
4.1管理机构 37
4.2 劳动定员 37
4.3 土建费用及主要设备材料费用 38
4.3.1 主要设备 38
4.3.2 土建费用造价列表 39
4.4 运行费用 40
4.4.1 动力费用 40
4.4.2 工资福利开支 40