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After upgrading waste water one times by the pump, the design finished the sewage whole treatment process by gravity flow to avoid repeating sewage upgrade in order to reduce losing power, decrease the cost of wastewater treatment and manage the operation easily.
The design is technically feasible and economically reasonable results. As Carrousel AC oxidation ditch of the depth shallower, and no primary sedimentation tank, the civil engineering costs less, while operation and management of the process simple, high degree of automation reduces the cost of operation and management, so the whole process has total investment of less stable , less secondary pollution , good effect , energy consumption etc. and to ensure that wastewater discharge standards. The project cost 22.23 million yuan, invest-ment, . Equivalent to the sewage treatment costs 0.41 yuan / m3.
The treated water is expected to achieve <urban sewage treatment plant emission standards>（GB18918-2002)emission standards at the national level:BOD5≤20mg/L，，SS≤20mg/L，CODcr≤60mg/LNH3-N≤8mg/L，TN≤20mg/L, reducing emissions to the environment each year for the 1752 tons COD .The polluted water has been greatly improved, to eliminate pollution, protect the environment and make benefits to human beings.
Keywords: Wastewater Treatment; T type oxidation ditch; Activated Sludge method;
目 录
1绪论 1
1.1 概况 1
1.2 设计依据与原则 1
1.2.1 设计依据 1
1.2.2 设计原则 2
1.3 设计规模与目标 2
2 污水处置工艺的选择 3
2.1水处置的方法分类 3
2.1.1 按废水处置的程度来分类 3
2.1.2 按污染物的性质分类 3
2.2 城市污水处置厂的工艺类型 4
2.2.1 AB法(Adsorption—Biooxidation) 4
2.2.2 A/A/O法(Anaerobic—Anoxic—Oxic) 4
2.2.3 SBR法（Sequencing Batch Reactor) 4
2.2.4氧化沟法 5
2.3 设计方案的确定 6
2.3.1 进水水质特点分析与出水要求 6
2.3.2 处置工艺方案选择 6
2.3.3 消毒工艺 7
2.3.4 污泥最终处置 7
2.4 预计处置效果 8
3 设计说明 8
3.1 工艺说明 8
3.1.1 格栅 8
3.1.2 提升泵房 8
3.1.3曝气沉砂池 9
3.1.4配水井 9
3.1.5 氧沟式氧化沟 9
3.1.6 紫外线消毒池 11
3.1.7 浓缩池 11
3.1.8脱水设施 11
3.2 设计计算 11
3.2.1 中格栅计算 12
3.2.2 细格栅计算 14
3.2.3 曝气沉砂池计算 16
3.2.4 配水井计算 18
3.2.5三沟式氧化沟计算 19
3.2.6紫外线消毒池计算 25
3.2.7污泥浓缩池计算 26
3.3 污水处置厂总体布置 28
3.3.1 总图布置原则 28
3.3.2 总图布置 29
3.3.3 高程布置 29
3.4 劳动定员 31
3.5 工程经济核算 32
3.5.1 直接费用 32
3.5.2 间接费用 33