Combined pipe network based rainwater partition treatment system

Abstract

The invention relates to the technical field of rainwater pretreatment, in particular to a combined pipe network based rainwater partition treatment system. A pipe network region comprises a branch rainwater pipe, a branch wastewater pipe and a main wastewater pipe; the whole pipe network region is divided into rainwater treatment sub-regions with the areas of 0.2-4 square kilometers according to meshes; each rainwater treatment sub-region comprises a branch rainwater pipe, a branch wastewater pipe and a rainwater partition treatment unit; the rainwater partition treatment unit is provided with a water inlet, a wastewater outlet and a purified water outlet; the water outlets of the branch rainwater pipe and the branch wastewater pipe in the rainwater treatment sub-region are both communicated with the water inlet of the rainwater partition treatment unit in the rainwater treatment sub-region; the wastewater outlet of the rainwater partition treatment unit is communicated with the main wastewater pipe; and the purified water outlet of the rainwater partition treatment unit is connected with a natural water body. With the adoption of a fragmental treatment method, a plurality of small-sized rainwater partition treatment units are established along the pipe network, so that the problem that first rain contains later rainwater due to a flow concentration time difference of a far point and a near point of the pipe network is avoided and the rainwater treatment effect is good.

Description

technical field [0001] The invention relates to the technical field of rainwater pretreatment, in particular to a rainwater partition treatment system based on a combined pipe network. Background technique [0002] In the current society, urbanization is developing more and more rapidly, the area of ​​the city is getting larger and larger, the structure of the urban rainwater pipe network is becoming more and more complex, and the pressure on the urban rainwater treatment system is increasing. At present, there are three types of urban rainwater pipe network: diversion system, confluence system and mixed flow system. [0003] The traditional rainwater treatment system of combined pipe network such as figure 1 As shown, a large rainwater treatment system is responsible for a large catchment area. Because the catchment area is too large, the delay time of rainwater in the pipeline or surface runoff is not fully considered, resulting in a large amount of initial rainwater and ...

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Problems solved by technology

But for area M, a large amount of later clean rainwater in area M is also discharged into the urban sewage treatment system during the time when the storage tank discharges the initial rainwater in area N. Such discharge will cause great damage to the urban sewage system dealing with stress

In addition, the pipe network in M ​​area and N area is generally connected during actual operation. Due to the difference in distance and the retention effect on the road, the initial rainwater in N area may seriously pollute the later clean rainwater in M ​​area, which will also lead to rainwater discharge. The irrationality of the situation

[0005] Due to the large amount of mixing of the initial rain and the later rainwater, if we want to realize the complete regulation and storage of the initial rainwater in this area, we need to build a huge large-scale storage tank 8, resulting in high cost, and the effect of regulation and storage is also due to the initial rain and the later period. The mixing of rainwater greatly reduces the

[0006] Some places also set up multiple storage tanks to treat rainwater, but the number of storage tanks did not consider the aforementioned confluence time difference between the far point and the near point when setting the number of storage tanks, so there is still a lot of mixing between the initial rain and the late rain The phenomenon of rainwater treatment and economic benefits are still not ideal

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