In the design process , first through the coarse grid sewage , in order to achieve the removal of sewage floating effect , prevent damage , blocking subsequent processing structures , followed by a horizontal flow grit chamber , separated from the wastewater , inorganic particle density is relatively large , the protection of the pump and piping , and reduce the volume of subsequent structures 。 The unit , in order to increase the share of the 。 In the anaerobic pool , the anaerobic bacteria can decompose and remove the organic matter in the waste water , so as to improve the biodegradability of the wastewater and facilitate the subsequent aerobic treatment 。 The aerobic phase using the Waterfall Aeration Contact oxidation tank , the use of water instead of oxygen , which saves the cost of aeration device , and can save the area 。 A part of the effluent of the anaerobic pond is used for irrigation , and a part of the water inlet is arranged in the anoxic regulation pool , and a part of the effluent of the contact oxidation pool is returned to the anoxic regulating pool 。 The effluent of the contact oxidation tank can reach the discharge standard after being treated by the constructed wetland 。 After disinfection , the water quality of domestic water can be met 。 

The content of this design includes the design of the process flow , the volume calculation of the building , the layout , elevation layout and design drawings 。 In theory , in the process after the treatment of the effluent indicators , is able to meet the national standards 。 In the design of the sewage treatment sludge generated in the process of sludge collection and treatment were similar to the return of farmland as fertilizer , as the use of building materials , such as the use of two ways 。 

In general, the whole design process of selection of advanced and mature technology, treatment effect and operation is reliable, convenient management, can guarantee the premise of the effect of sewage treatment, saving construction and operation cost, support environment construction。 

Keywords: Sewage, Waterfall Aeration, Hypoxia Regulation, artificial wetland 

目录

1绪论 3

1。1 我国城镇污水概况 3

1。1。1国内水资源现状 3

1。1。2国内水污染现状 3

1。1。3国内外污水处理研究进展 4

1。2设计污水量 5

1。3进出水水质 5

1。4设计依据 6

2污水处理工艺论证 7

2。1 污水厂处理流程的选择 7

2。1。1 确定处理流程的原则 7

2。1。2 污水处理流程的选择 7

2。2污水处理流程方案的工艺论证 8

2。2。1 AB法 8

2。2。2 SBR法 8

2。2。3 A2/O法 8

2。2。4 生物膜法 9

2。3污水处理工艺的确定 9

2。4工艺流程 10

2。4。1工艺流程说明 10

2。4。2 工艺流程框图 10

3处理构筑物设计计算 11

3。1 格栅 11

3。1。1主要参数