Sewage and rainwater combined drainage system and control method

Abstract

The invention relates to a sewage and rainwater combined drainage system, which comprises a sewage main pipe on a municipal road, a rainwater main pipe on the municipal road, and a confluence header pipe in a unit area, wherein a sewage treatment plant is arranged at the outlet of the sewage main pipe; the tail end of the rainwater main pipe is connected to a natural water body; and the outlet ofthe confluence header pipe is connected to the sewage main pipe; the drainage system is characterized in that one or more flow distributing devices are arranged on the confluence header pipe, and thewater inlet end of each flow distributing device communicates with the confluence header pipe; each flow distributing device is provided with three water outlets; each first water outlet is connectedto the sewage main pipe; each second water outlet is connected to the rainwater main pipe; each third water outlet is connected to the water inlet of an online rainwater treatment facility; and the water outlet of each online rainwater treatment facility is connected to the rainwater main pipe.

Description

Technical field [0001] The invention relates to a combined drainage pipe network system, in particular to a combined drainage system and a control method of sewage and rainwater. Background technique [0002] Urban municipal drainage systems are mainly divided into combined drainage systems and split drainage systems. The earliest combined drainage system was to mix sewage, industrial wastewater and rainwater in the same pipe and drain it directly into the nearby water body without any treatment, causing serious pollution to the receiving water body. Many old cities at home and abroad have adopted it. this way. Now often used is the intercepted combined drainage system. [0003] The intercepted combined drainage system and the traditional combined drainage system are basically the same in structure. The difference is that the intercepted combined drainage system has an intercepting well between the municipal combined main pipe and the sewage treatment plant. When the interceptin...

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Problems solved by technology

[0004] For this combined drainage system, the main problems are: ① When it rains, non-point source pollution will be generated on residential areas and municipal roads. Although the existing combined drainage system has an interception well at the end for interception, the designed interception The multiple is not enough, so that the interception well fails to intercept the non-point source pollutants, and the non-point source pollutants directly enter the natural water body, causing pollution to the natural water body

② To control non-point source pollution, it is necessary to increase the size of the interception well, increase the size of the interception main pipe, and increase the capacity of the sewage plant

③ The interception of the interception is an extensive control, and the initial rainwater cannot be accurately intercepted

There are many problems in this split drainage system: ① Some sewage in the residential area enters the rainwater pipe by mistake, for example, the sewage discharged from the washing machine on the balcony will be directly discharged into the natural water body

The main problems of this drainage system are: ①The entire system cannot effectively intercept non-point source pollutants, and the interception efficiency is low

② Unable to control the sewage entering the rainwater pipe

④ Extensive control of interception wells. On the one hand, it may not be possible to send more initial rainwater to the sewage plant for treatment, causing non-point source pollutants to be discharged into natural water bodies. On the other hand, it may send a large amount of late rainwater to the sewage plant, increasing the sewage The load of the plant reduces the treatment efficiency of the sewage plant

[0007] Generally speaking, the current drainage system has the following problems: first, the non-point source pollution cannot be controlled; second, the control is extensive, and the sewage and initial rainwater cannot be precisely controlled; third, the pipelines are mixed, and the sewage is directly discharged to the Natural water bodies; Fourth, for areas with tight land use, terminal treatment cannot be effectively implemented

[0008] At the same time, the inventors also found that this situation is even more serious for some old urban areas or urban villages. Due to the imperfect design of the previous rain and sewage pipe network, many units such as old urban areas or urban villages There is no rainwater main pipe and sewage treatment plant in the area, or the original combined main pipe did not separate the collected rainwater from the domestic sewage discharged into it, so that the sewage and rainwater are directly discharged to the municipal sewage main pipe, and discharged to the sewage main. The rainwater from the pipe increases the treatment intensity of the sewage treatment plant at the end of the sewage main, making it inefficient

[0009] In addition, if the characteristics of the initial rainwater in the area where the old city or urban village is located are not obvious, it will still cause pollution if the middle and later rainwater is diverted and discharged to natural water bodies

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