总说明本次设计参照某地区小型污水处理厂，该厂所处理的污水多为服务区附近的居民生活污水。其中污水平均日设计流量为45000m3/d，污水水质为：COD=300mg/L，SS=200mg/L，TN=35mg/L，BOD5=160mg/L，NH3-N=25mg/L。79601

污水处理厂的出水水质要求达到《上海市污水综合排放标准》GB 31199—2009中一级标准，即BOD5≤20mg/L，SS≤60mg/L，COD≤80mg/L，TP≤0。5mg/L，NH3-N≤10mg/L，TN≤25mg/L。

本设计中根据进水水质及出水水质要求、未来人口的增长、污水厂处理污水能力等条件，通过方案比较，采用改良氧化沟工艺处理该城市污水。该工艺按照硝化，反硝化程序设计运行，抗冲击负荷能力强，运行管理方便。原混合污水生物处理经过格栅、污水提升泵房、沉砂池、改良氧化沟、二沉池等构筑物。在污水生物处理过程中产生的污泥送至浓缩池、脱水机房一并处置，处理后的污泥通过船运的方式运送到松江区松亭园艺场。

毕业论文关键词：城市污水    脱氮除磷    改良氧化沟工艺   

Wastewater Treatment Plant Process Design General description

This design refers to a small sewage treatment plant in a region， the project handled by the sewage for the service area near the residents of domestic sewage。 The average daily flow of sewage is 45000/d, the effluent quality is: COD =300mg/L, SS = 200mg/L, TN = 35mg/L, BOD5 = 160mg/L, NH3-N = 25mg/L。

Sewage treatment plant effluent quality requirements to achieve "Shanghai Integrated Wastewater Discharge Standard" GB 31199-2009 in a standard, namely BOD5≤20mg/L,SS≤60mg/L,COD≤80mg/L, TP≤0。5mg/L ,NH3-N≤10mg/L, TN≤25mg/L。

This design is based on the water quality and water quality requirements, the future population growth, sewage treatment capacity of sewage and other conditions, through the program comparison, the use of improved oxidation ditch process to deal with the city sewage。 The process in accordance with the nitrification, denitrification program design run, impact load capacity, easy operation and management。 The original mixed sewage biological treatment through the grille, sewage pumping station, grit chamber, improved oxidation ditch, secondary settling tank and other structures。 In the process of sewage biological treatment generated sludge sent to the concentration pool, dehydration room together, the treated sludge transported by way of shipping to Songjiang District Songting horticultural field。

Keywords: Urban sewage、Nitrogen and phosphorus removal、Improved oxidation ditch process、

目   录

第1章 概论 1

1。1 设计依据和设计任务 1

1。1。1 设计题目 1

1。1。2 设计任务 1

1。1。3 设计原始资料 2

第2章 处理工艺流程的选定 3

2。1 确定工艺流程的原则 3

2。2 工艺流程的确定 3

2。2。1 工艺比选 3

2。3 工艺流程框图 6

2。4 主要构筑物的选择 6

2。4。1 格栅 6

2。4。2 污水泵房 7

2。4。3 沉砂池 8

2。4。4 消毒 9

2。4。5 浓缩池 9

2。4。6 污泥消化池