CN107747345B

CN107747345B - Surface pollution control system and method for combined drainage pipe network system

Info

Publication number: CN107747345B
Application number: CN201710830130.1A
Authority: CN
Inventors: 周超; 李习洪
Original assignee: Wuhan Shengyu Drainage Systems Co Ltd
Current assignee: Wuhan Shengyu Smart Ecological Environmental Protection Co ltd
Priority date: 2017-05-10
Filing date: 2017-09-06
Publication date: 2023-11-17
Anticipated expiration: 2037-09-06
Also published as: CN107747345A

Abstract

The invention discloses a surface pollution control system and a surface pollution control method for a combined drainage pipe network system. The system comprises a sewage main pipe, a rainwater main pipe and a rainwater pipeline, and also comprises one or more unit areas, wherein the sewage pipeline and the rainwater pipeline are arranged in the unit areas; the outlets of the sewage pipeline and the rainwater pipeline are communicated with the inlet of the rainwater pipeline; the outlet of the rain sewage pipeline is connected with the inlet of a sewage main pipe, and the outlet of the sewage main pipe is provided with a sewage treatment plant; the outlet of the rainwater main pipe is communicated with a natural water body, and the rainwater main pipe is characterized in that: the sewage main pipe is provided with a first rainwater treatment system, the water inlet end of the first rainwater treatment system is communicated with the rainwater pipeline, and the water outlet end of the first rainwater treatment system is respectively communicated with the sewage main pipe and the rainwater main pipe. The system and the control method have simple structure and convenient construction, and can realize the efficient treatment of sewage and initial rainwater in each area divided by administrative functions in the city by only constructing the diversion treatment system in the area with limited municipal roads.

Description

Surface pollution control system and method for combined drainage pipe network system

Technical Field

The invention relates to a surface pollution control system and a control method thereof, belongs to the technical field of distributed source surface pollution control, and particularly relates to a surface pollution control system for a combined drainage pipe network system and a control method thereof.

Background

The municipal drainage system mainly comprises a confluence drainage system and a diversion drainage system. The earliest confluence drainage system mixes domestic sewage, industrial wastewater and rainwater in the same pipe canal, and directly discharges the domestic sewage, industrial wastewater and rainwater into water nearby without any treatment, so that the receiving water is severely polluted, and most old cities at home and abroad adopt the mode. A closure type confluence drainage system is now commonly used.

The closure type confluence drainage system is basically the same as the traditional confluence drainage system in structure, and the difference is that the closure type confluence drainage system is provided with a closure well between a municipal confluence main pipe and a sewage treatment plant. When the intercepting type confluence drainage system works, domestic sewage discharged by residents and rainwater collected by a rainwater port enter a municipal confluence main pipe through a confluence pipeline, and rainwater collected by the rainwater port along the municipal road also enters the municipal confluence main pipe. In sunny days, all sewage is conveyed to a sewage treatment plant and is discharged to a natural water body after being treated. During rainfall, sewage and rainwater at the early rainfall stage can be conveyed to a sewage treatment plant and discharged to a natural water body after being treated. However, as the rainfall increases, the rainfall runoff increases, and when the flow of the mixed sewage exceeds the water delivery capacity of the intercepting main pipe, part of the mixed sewage overflows and directly enters the natural water body.

The problems of the combined drainage system are mainly as follows: (1) when rainfall, the residential area and municipal road can produce non-point source pollution, and current confluence drainage system is equipped with the vatch basin at the end and intercepts, but the shutoff multiple of design is not enough for the vatch basin can't intercept the non-point source pollutant, and the non-point source pollutant directly gets into natural water, causes the pollution to natural water. (2) To control the source pollution, it is necessary to increase the size of the intercepting well, the size of the intercepting main pipe, and the capacity of the sewage treatment plant. (3) The interception of the intercepting well is rough control, and the initial rainwater cannot be accurately intercepted.

The drainage system of the combined system is divided into two drainage systems of a complete combined system and an incomplete combined system according to different modes of removing rainwater. The completely combined drainage system is characterized in that rainwater and domestic sewage are completely separated and conveyed by different pipelines. Domestic sewage discharged by residents enters a sewage main pipe through a sewage pipeline and is then conveyed to a sewage treatment plant for treatment and then discharged, and rainwater collected by a rainwater inlet enters the rainwater main pipe through a rainwater pipeline and is directly discharged to a natural water body. Rainwater collected by the rainwater inlet along the municipal road also enters the rainwater main pipe and is directly discharged to the natural water body. In such a combined drainage system, there are many problems: (1) part of domestic sewage in the living area erroneously enters a rainwater pipeline, for example, the domestic sewage discharged by a washing machine on a balcony can be directly discharged to a natural water body. (2) Part of sewage on municipal roads erroneously enters a rainwater pipeline, for example, sewage generated during road cleaning can be directly discharged to natural water. (3) During rainfall, non-point source pollution can be generated on residential areas and municipal roads, and the non-point source pollutant can directly enter natural water.

The incomplete confluence system is mainly aimed at collecting and treating rainwater, and the rainwater collected in a residential area is separated from the rainwater collected on a municipal road. Resident's discharged domestic sewage and rainwater that the inlet for stom water was collected all are discharged through the confluence pipeline, set up the vatch basin and carry out the shutoff before getting into municipal drainage pipeline. Rainwater collected by the rainwater inlet along the municipal road enters the rainwater main pipe and is directly discharged to the natural water body. In sunny days, sewage discharged from residential areas is intercepted to a sewage main pipe and then is conveyed to a sewage treatment plant, and is discharged to a natural water body after being treated, but part of sewage on municipal roads enters the rainwater main pipe and is directly discharged to the natural water body. When rainfall, sewage discharged by a living area and rainwater at the early stage of rainfall are intercepted to a sewage main pipe and then conveyed to a sewage treatment plant, and the sewage is treated and then discharged to a natural water body, but along with the increase of rainfall, the runoff of the rainwater is also increased, when the flow of mixed sewage exceeds the water conveying capacity of an intercepting pipeline, part of mixed sewage overflows and directly enters the rainwater main pipe, and meanwhile, the initial rainwater carrying a large amount of pollutants on a municipal road also directly enters the rainwater main pipe and is discharged to the natural water body. The problems with such drainage systems are mainly: (1) the whole system can not effectively intercept the source pollutants, and the interception efficiency is low. (2) The sewage entering the rainwater pipeline cannot be controlled. (3) When rainfall occurs, domestic sewage is easy to be carried by rainwater and enters into natural water. (4) The control of vatch basin is extensive, and more initial rainwater can not send into sewage treatment plant and handle for the non-point source pollutant has discharged natural water, and on the other hand probably sends a large amount of later stage rainwater into sewage treatment plant, has increased sewage treatment plant's load, has reduced sewage treatment plant's treatment effeciency.

In general, the current drainage system has the following problems: first, the control of the source pollution is not possible; secondly, the control is rough, and the sewage and the initial rainwater cannot be accurately controlled; thirdly, the pipelines are connected in a mixed mode, and sewage is directly discharged to a natural water body; fourth, for areas of intense land use, terminal management is not effective.

The invention discloses a Chinese patent with the publication number of CN105625545A and the name of 'regional fragmented rainwater treatment system based on a split-flow pipe network', and provides a novel pipe network dividing method for solving the problems. According to the application, the whole pipe network is divided into a plurality of grid-shaped areas according to the area, and each area is internally provided with an independent online rainwater treatment facility, and rainwater in the area is comprehensively treated through the online rainwater treatment facility in the area. However, the inventor finds out through a large number of experiments that the terminal treatment thought improves the rainwater treatment efficiency and the degree in the corresponding sheet area to a certain extent and controls the non-point source pollution in the sheet area; however, the problem that the surface runoff collection is difficult to accurately control still exists, and moreover, the time difference exists between the initial rain collection at the farthest end and the nearest end of the online rainwater treatment facility, and the collection of the initial rain and the non-point source pollution cannot be accurately controlled, so that the accurate treatment cannot be realized. In addition, due to the problem of urban planning, a lot of interferences exist in dividing the urban pipe network into grid-shaped areas, the implementation difficulty is very high, and great trouble is caused to the urban pipe network arrangement mode in the mode.

Meanwhile, the inventor also discovers that the existing regional treatment technology has the following problems that as the segmentation is divided based on geographic positions, different application facilities such as industry, residential communities, schools and the like are not considered to be divided into the same region, so that the sewage components in the region are complex, the accurate treatment and separation difficulty is high, and the cost is higher.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a surface pollution control system and a control method thereof for a combined drainage pipe network system, which solve the technical problems that surface pollution of urban unit areas and municipal road areas in the prior art cannot be effectively intercepted and treated and sewage and rainwater cannot be accurately controlled.

The technical scheme of the invention is as follows:

the surface pollution control system for the combined drainage pipe network system comprises a sewage main pipe, a rainwater main pipe and a rainwater pipeline, and further comprises one or more unit areas, wherein the sewage pipeline and the rainwater pipeline are arranged in the unit areas; the outlets of the sewage pipeline and the rainwater pipeline are communicated with the inlet of the rainwater pipeline;

the outlet of the rain sewage pipeline is connected with the inlet of a sewage main pipe, and the outlet of the sewage main pipe is provided with a sewage treatment plant; the outlet of the rainwater main pipe is communicated with a natural water body, and the rainwater main pipe is characterized in that:

The sewage main pipe is provided with a first rainwater treatment system, the water inlet end of the first rainwater treatment system is communicated with the rainwater pipeline, and the water outlet end of the first rainwater treatment system is respectively communicated with the sewage main pipe and the rainwater main pipe.

According to the invention, the system further comprises a second rainwater treatment system arranged on the rainwater main pipe, wherein the water inlet end of the second rainwater treatment system is communicated with the rainwater main pipe, and the water outlet end of the second rainwater treatment system is communicated with the sewage main pipe.

According to the invention, the surface pollution control system of the combined drainage pipe network system further comprises a municipal rainwater pipeline, and the municipal rainwater pipeline is communicated with the rainwater main pipe.

According to the invention, the municipal rainwater pipeline is positioned on a municipal road outside the district.

According to the invention, the combined drainage pipe network system can be further provided with one or more parallel or serial tail end regulating reservoirs at the position of the sewage main pipe close to the sewage treatment plant.

According to the invention, the area of the cell area is 0.01 to 0.6 square kilometers, preferably 0.01 to 0.3 square kilometers.

According to the invention, the unit area is a land area including buildings and structures divided by the same or similar properties of functional use or sewage and rainwater pollution levels in the urban area.

According to the present invention, the building and structure is selected from one or a combination of two or more of residential communities, industrial and mining enterprises, institutions, schools, hospitals, malls, or other unit areas where large amounts of sewage may be generated.

According to the invention, the sewer line and the rainwater line are respectively connected to a drain pipe of a building or structure.

According to the invention, the first rainwater treatment system is selected from one or a combination of more than two of a diversion well, a drainage well, a intercepting well, a regulation facility or an online rainwater treatment facility.

According to the invention, the second rainwater treatment system is selected from one or a combination of more than two of a diversion well, a drainage well, a intercepting well, a regulation facility or an online rainwater treatment facility.

According to the invention, when the second rainwater treatment system is selected from a regulation facility or an online rainwater treatment facility, an inlet of the regulation facility or the online rainwater treatment facility at a communication position with the rainwater main pipe is not lower than an outlet of the rainwater main pipe at the communication position, and a first water conservancy switch is arranged at a downstream of the inlet of the regulation facility or the online rainwater treatment facility; or,

the inlet of the communicating part of the regulation facility or the online rainwater treatment facility and the rainwater main pipe is lower than the outlet of the communicating part of the rainwater main pipe, and the water inlet end of the regulation facility or the online rainwater treatment facility is not provided with a water conservancy switch.

According to the invention, the combined drainage pipe network system can further comprise a rainwater pretreatment system; it may be incorporated on the rainwater trunk or located beside the rainwater trunk;

according to the invention, the drainage end of the rainwater pretreatment system is communicated with a rainwater main pipe or a natural water body.

According to the invention, the inlet at the position where the rainwater pretreatment system is communicated with the rainwater main pipe is not lower than the outlet at the position where the rainwater pretreatment system is communicated with the rainwater main pipe, and a second water conservancy switch is arranged at the downstream of the inlet; or,

the inlet of the communicating position of the rainwater pretreatment system and the rainwater main pipe is lower than the outlet of the communicating position of the rainwater pretreatment system and the rainwater main pipe.

According to the invention, the number of the first rainwater treatment systems is one or more; when the number of the first stormwater treatment systems is plural, the first stormwater treatment systems may be mounted in series or in parallel on a pipe.

According to the invention, the number of the second rainwater treatment systems is one or more; when the number of the second stormwater treatment systems is plural, the second stormwater treatment systems may be mounted in series or in parallel on the pipes.

Preferably, the regulation facility is selected from any one or a combination of more than two of an initial rain regulation pool, an overflow regulation pool, a regulation box culvert and a deep tunnel.

Preferably, the hydraulic switch is selected from a valve, gate, flap gate or weir gate; more preferably a ball valve, a shut-off flap, an upper open gate, a rotating weir gate or a lower open weir gate.

Preferably, the on-line rainwater treatment facility is selected from any one or a combination of two or more of an on-line rainwater treatment tank, a sand sedimentation tank, a passing tank and an integrated treatment apparatus.

Preferably, the rainwater pretreatment system is selected from any one or a combination of more than two of a particle separator, a filter, a rainwater treatment module or a biological nitrogen and phosphorus removal device, more preferably the rainwater pretreatment system is selected from a combination of more than two of a particle separator, a filter or a rainwater treatment module, and even more preferably the particle separator, the filter and the rainwater treatment module are sequentially connected in series.

According to the invention, the number of the rainwater pretreatment systems is one or more; when the number of the rainwater pretreatment systems is plural, the rainwater pretreatment systems are installed on the pipeline in a serial or parallel manner.

Preferably, the number and the installation mode of the regulation facility, the online rainwater treatment facility and the rainwater pretreatment system are not particularly limited, and the regulation can be performed according to the rainwater pollution condition and the land condition of each area.

Preferably, the internal configuration of the storage facility, the on-line rainwater treatment facility, and the rainwater pretreatment system and the installation method thereof are not particularly limited, and can be adjusted according to the pollution conditions of the rainwater and the soil conditions of each area.

According to the invention, when the first rainwater treatment system and the second rainwater treatment system are composed of the plurality of components, the number or the combination arrangement mode of the components in the system is not limited, and the purpose of diversion and regulation can be achieved.

As an example, in the system disclosed by the invention, a first initial rain regulation tank is arranged on a sewage main pipe, the water inlet end of the first initial rain regulation tank is communicated with the sewage main pipe, a second initial rain regulation tank and a lower open type weir gate are arranged on the rainwater main pipe, the water inlet end of the second initial rain regulation tank is communicated with the rainwater main pipe, the water outlet end of the second initial rain regulation tank is communicated with the sewage main pipe, and the lower open type weir gate is positioned at the downstream of the water inlet end of the second initial rain regulation tank; and/or the rainwater main pipe is communicated with a rainwater pretreatment system through a branch pipe; the branch pipes are provided with lower open type weir gates, and the lower open type weir gates are positioned at the upstream of the rainwater pretreatment system.

Preferably, one or more first initial rain regulating reservoirs are arranged on the sewage main pipe.

Preferably, one or more second primary rain regulating reservoirs are arranged on the rainwater main pipe, and one downward opening type weir gate is correspondingly arranged at the downstream of the water inlet end of the second primary rain regulating reservoirs.

A surface pollution control method for a combined drainage pipe network system comprises the steps of arranging a sewage main pipe, sending sewage in a city area to a sewage treatment plant for treatment, and then discharging the sewage to a natural water body; setting a rainwater main pipe, and discharging rainwater in a city area to a natural water body; a rain and sewage pipeline is arranged, and the outlet of the rain and sewage pipeline is connected with the inlet of a sewage main pipe; the system also comprises one or more unit areas, wherein a sewage pipeline and a rainwater pipeline are arranged in the unit areas; communicating outlets of the sewage pipeline and the rainwater pipeline with inlets of the rainwater pipeline; a sewage treatment plant is arranged at the outlet of the sewage main pipe; the method is characterized in that:

According to the invention, the control method further comprises the step of arranging a second rainwater treatment system on the rainwater main pipe, wherein the water inlet end of the second rainwater treatment system is communicated with the rainwater main pipe, and the water outlet end of the second rainwater treatment system is communicated with the sewage main pipe.

According to the present invention, the municipal rainwater pipeline is located on the municipal road outside the cell. According to the invention, the combined drainage pipe network system can be further provided with one or more parallel or serial tail end regulating reservoirs at the position of the sewage main pipe close to the sewage treatment plant.

According to the invention, the method further comprises:

when sunny days and the rainfall is small, the mixed sewage in the sewage pipeline and the rainwater pipeline is discharged into the rainwater pipeline, and the mixed sewage in the rainwater pipeline is directly discharged to the sewage main pipe after being treated by the first rainwater treatment system;

when the rainwater is in the middle and later period, the mixed sewage in the sewage pipeline and the rainwater pipeline is discharged into the rainwater pipeline, and the mixed sewage in the rainwater pipeline is directly discharged to a sewage main pipe or is led into the rainwater main pipe after being treated by the first rainwater treatment system;

when the rainfall is increased to the upper limit of the treatment capacity of the first rainwater treatment system, the sewage in the sewage main pipe is directly discharged into the rainwater main pipe after being treated by the first rainwater treatment system.

According to the invention, the method further comprises:

when sunny days and the rainfall is small, the mixed sewage in the sewage pipeline and the rainwater pipeline is discharged into the rainwater pipeline, and the mixed sewage in the rainwater pipeline is directly discharged to the sewage main pipe after being treated by the first rainwater treatment system; the mixed sewage in the rainwater main pipe is directly discharged to a natural water body or directly led into the sewage main pipe after being treated by the second rainwater treatment system;

When the rainwater is in the middle and later period, the mixed sewage in the sewage pipeline and the rainwater pipeline is discharged into the rainwater pipeline, and the mixed sewage in the rainwater pipeline is directly discharged to a sewage main pipe or is led into the rainwater main pipe after being treated by the first rainwater treatment system; the mixed sewage in the rainwater main pipe is treated by a second rainwater treatment system and then is directly discharged to a natural water body or is led into the sewage main pipe;

when the rainfall is increased to the upper limit of the treatment capacity of the first or second rainwater treatment systems, the sewage in the sewage main pipe is directly discharged into the rainwater main pipe after being treated by the first rainwater treatment system; and the later-stage rainwater in the rainwater main pipe is directly discharged into a natural water body.

Preferably, the hydraulic switch is selected from a valve, gate, flap gate or weir gate; preferably a ball valve, a shut-off flap gate, an upper open gate, a rotating weir gate or a lower open weir gate.

Preferably, the rainwater pretreatment system is selected from any one or a combination of more than two of a particle separator, a filter, a rainwater treatment module or a biological nitrogen and phosphorus removal device, preferably the rainwater pretreatment system is selected from a combination of more than two of a particle separator, a filter or a rainwater treatment module, and more preferably the particle separator, the filter and the rainwater treatment module are sequentially connected in series.

As an example, in the system of the invention, a first primary rain regulation reservoir is arranged on a sewage main pipe, the water inlet end of the first primary rain regulation reservoir is communicated with a rain sewage pipeline, and the water outlet end of the first primary rain regulation reservoir is communicated with the sewage main pipe.

The rainwater main pipe is provided with a second initial rainwater regulation and storage tank and a lower open type weir gate, the water inlet end of the second initial rainwater regulation and storage tank is communicated with the rainwater main pipe, the water outlet end of the second initial rainwater regulation and storage tank is communicated with the sewage main pipe, and the lower open type weir gate is positioned at the downstream of the water inlet end of the second initial rainwater regulation and storage tank; and/or the rainwater main pipe is communicated with a rainwater pretreatment system through a branch pipe; the branch pipes are provided with lower open type weir gates, and the lower open type weir gates are positioned at the upstream of the rainwater pretreatment system.

The beneficial effects of the invention are as follows:

1) The control method has simple structure and convenient construction, and can realize the accurate control of sewage and initial rainwater in each area by only constructing a diversion and regulation facility in the limited area of the municipal road so as to achieve the aim of efficiently treating rain and sewage.

2) The control method controls the surface pollution, avoids the situation that the rain and the sewage of the combined pipeline cannot be effectively separated or the rain water main pipe is mixed with sewage due to various reasons, thereby achieving the purposes of high-efficiency sewage discharge and drainage and avoiding the pollution of natural water.

3) The control method of the invention can use simple equipment and realize the treatment of rain and sewage in a flexible installation mode, thereby avoiding the problem of inconvenient installation of rain and sewage treatment facilities due to shortage of urban land.

4) The control method can avoid the problem that the intercepting capacity of the intercepting well in the existing intercepting type combined drainage system is insufficient or the intercepting well cannot intercept accurately; thereby efficiently treating rain and sewage without increasing the treatment load of the original sewage treatment plant.

5) The diversion treatment of the source greatly shortens the overflow time of the primary rain from the ground to the regulation and storage facilities or the diversion well, thereby reducing the probability of mixing the late-stage rain water and the initial-stage rain water in the source area such as a district, ensuring that the concentration of the trapped or collected initial-stage rain water is higher and the sewage interception efficiency is very high.

6) The current end-slice water-receiving area takes a value of 0.4-4 square kilometers, and the water-receiving area of the source dispersed sewage interception of the invention is only 0.01-0.6 square kilometers.

7) When the tail ends intercept dirt, the mud accumulation at the bottom of the pipeline can influence the characteristic of the primary rain, so that the characteristic of the primary rain is not obvious, but the source intercepts the dirt pipeline to be shorter, the influence of the mud accumulation is basically negligible, and the characteristic of the primary rain is obvious.

8) When the tail end is used for intercepting sewage, the pipeline is long in distance, underground water along the pipeline can be permeated due to the damage of the pipeline, the concentration of the primary rain can be diluted, and a certain amount of primary rain intercepted by the primary rain can contain a certain proportion of external water; but the source cuts dirty, because the pipeline is shorter, the problem of pipe network is basically negligible, and the initial rain concentration of intercepting also will improve greatly.

According to the technical scheme, on the basis that an original drainage pipeline in a unit area does not need to be reconstructed, for example, a sewage pipeline and a rainwater pipeline in the unit area can be connected in series by using the initial rain regulation and storage tank, so that the effective interception of the source pollutants in the unit area is effectively realized, and the interception efficiency of the non-point source pollutants is improved; for example, the sewage main pipe and the rainwater main pipe on the municipal road are connected in series by using the primary rain regulating reservoir, so that the effective interception of the source pollutants on the municipal road is effectively realized, and the interception efficiency of the source pollutants is improved; the integral structure realizes the accurate control of sewage and initial rainwater in each administrative area in the urban area, and simultaneously avoids the direct discharge of sewage caused by the mixed connection of pipelines to natural water; the invention can further improve the treatment efficiency of the initial rainwater by arranging a rainwater pretreatment system on the rainwater pipeline and/or the rainwater main pipe; the invention can effectively avoid the reconstruction of pipelines in the unit area by arranging the first initial rain regulation reservoir and the second initial rain regulation reservoir in the municipal road area, thereby effectively solving the problem of shortage of urban land.

Drawings

FIG. 1 is a schematic diagram of a combined drainage pipe network system for controlling pollution of domestic sewage and initial rainwater in the prior art;

FIG. 2 is a schematic diagram of a prior art face pollution control method for a combined drainage pipe network system;

FIG. 3 is a schematic diagram of a combined drainage pipe network system for controlling only domestic sewage and controlling the pollution of domestic sewage and initial rainwater in the prior art;

FIG. 4 is a schematic diagram of a surface pollution control method for a combined drainage pipe network system according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a surface pollution control method for a combined drainage pipe network system according to a second embodiment of the present invention;

FIG. 6 is a schematic diagram of a surface pollution control method for a combined drainage pipe network system according to a third embodiment of the present invention;

FIG. 7 is a schematic diagram of a surface pollution control method for a combined drainage pipe network system according to a fourth embodiment of the present invention;

FIG. 8 is a schematic diagram of an on-line rainwater treatment facility for a face pollution control method of a combined drainage pipe network system according to the present invention;

the meaning of each reference numeral is as follows: 1-inlet for stom water, 2-particle separator, 3-filter, 4-rainwater treatment module, 5-sewage treatment plant, 6-natural water, 7-vatch basin, 8-municipal administration confluence pipeline, 9-open weir gate, 10-first diversion well, 11-second diversion well, 12-regulation pond, 13-buffer pond, 14-first rain regulation pond, 15-on-line treatment regulation pond, 16-urgent flood discharge passageway, 17-control valve, 18-rain sewage pipeline, 19-first sewage discharge pipeline, 20-first rainwater discharge pipeline, 21-second sewage discharge pipeline, 22-second rainwater discharge pipeline, A-unit area, B-municipal road area, C-first rain regulation pond, D-second first rain regulation pond, A-1-sewage pipeline, A-2-rainwater pipeline, B-1-sewage dry pipe, B-2-rainwater main, B-3-municipal rainwater pipeline.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

In the description of the present invention, it should be noted that the terms "first," "second," and the like are used for descriptive purposes only and are not indicative or implying relative importance.

Example 1

As can be seen from the structural schematic diagram of a diversion drainage pipe network system for controlling domestic sewage and initial rainwater pollution shown in fig. 4, the invention comprises a plurality of unit areas a, a sewage main pipe B-1 and a rainwater main pipe B-2, wherein the unit areas a are land areas which are divided into urban areas by functional use attributes and comprise structures, and the area of the unit areas is 0.3 square kilometer; the structure is one of a residential community, an industrial and mining enterprise or an organization or a school or a hospital or a market, a sewage pipeline A-1 and a rainwater pipeline A-2 which are communicated with a structure drain pipe are arranged in each unit area A, the rainwater pipeline A-2 is communicated with the sewage pipeline A-1, the sewage pipeline A-1 is communicated with a water inlet end of a first initial rain regulation and storage tank C, a first water outlet end of the first initial rain regulation and storage tank C is communicated with a sewage main pipe B-1, and a second water outlet end of the first initial rain regulation and storage tank C is communicated with a rainwater main pipe B-2; and the rainwater main pipe B-2 is connected with a rainwater inlet pipeline B-3 on the municipal road.

As shown in fig. 4, in this embodiment, the rainwater main pipe B-2 is sequentially connected with a second primary rainwater regulation tank D and a downward opening type weir gate 9, a water inlet end of the second primary rainwater regulation tank D is connected with the rainwater main pipe B-2, a water outlet end of the second primary rainwater regulation tank D is connected with the sewage main pipe B-1, and the downward opening type weir gate 9 is located at a downstream of the water inlet end of the second primary rainwater regulation tank D.

In this embodiment, the first initial rain regulation reservoir C includes a buffer reservoir, a regulation reservoir and a flood discharge gallery; the second primary rain regulation pond D comprises a buffer pond and a regulation pond.

Example two

As shown in fig. 5, in this embodiment, the rainwater main pipe B-2 is connected to a rainwater pretreatment system through a branch pipe, and a lower open type weir gate 9 is disposed on the branch pipe, and the lower open type weir gate 9 is located at the front end of the rainwater pretreatment system.

The rainwater pretreatment system comprises a particle separator 2, a filter 3 and a rainwater treatment module 4 which are sequentially connected in series.

In the control method of the embodiment, domestic sewage discharged by residents and rainwater collected by a rainwater port are discharged through a sewage pipeline A-1 and a rainwater pipeline A-2 in a residential area, and a first initial rainwater regulation and storage tank C is arranged before the domestic sewage and rainwater enter a municipal drainage pipeline to accurately control and collect sewage and initial rainwater which cannot be treated in time by a sewage treatment plant. And a second primary rainwater regulation and storage pool D or a rainwater pretreatment system is also arranged on the rainwater trunk pipe B-2 in a segmented manner to regulate and store or treat the sewage and rainwater entering the rainwater pipeline.

In sunny days, sewage discharged from a living area and sewage entering a municipal rainwater pipeline enter a sewage main pipe through a buffer pool of the first primary rain regulating and accumulating pool C, and then are conveyed to a sewage treatment plant and discharged to a natural water body after being treated. During rainfall, according to the treatment capacity of a sewage treatment plant, part of mixed sewage formed by sewage and initial rainwater enters a sewage main pipe B-1 through a buffer tank of a first initial rainwater regulation and storage tank C and is conveyed to the sewage treatment plant for treatment, and the other part of mixed sewage enters a second initial rainwater regulation and storage tank D (a lower opening type weir gate 9 is arranged for intercepting, so that initial rainwater is intercepted to the second initial rainwater regulation and storage tank D, the lower opening type weir gate 9 is completely opened after the initial rainwater interception is finished, and the later rainwater is discharged to a natural water body) or a rainwater pretreatment system, and the mixed sewage entering the second initial rainwater regulation and storage tank D is pumped to the sewage treatment plant when the sewage treatment plant has the treatment capacity and is discharged to the natural water body after being treated. The mixed sewage entering the rainwater pretreatment system can be pretreated and deeply treated and then is permeated into the ground or discharged into natural water or recycled. The rainwater pretreatment system can be composed of a particle separator, a filter and a rainwater module, wherein the particle separator is used for intercepting pollutants such as floaters, large particles, oil, grease and the like in rainwater; the filter is used for deep filtration to remove fine particulate matters, nitrogen, phosphorus, heavy metals and other pollutants in the rainwater; the rainwater module is used for collecting and treating clean rainwater and then used for infiltration or discharge or recycling. Along with the duration of rainfall, when the rainfall intensity is small, part of mixed water formed by middle-late-stage rainwater and sewage can enter a sewage main pipe B-1 through a buffer pool of a first initial rainwater regulation and storage pool C and is conveyed to a sewage treatment plant, the total amount of the mixed water is determined by the treatment capacity of the sewage treatment plant, and the rest of mixed water enters a rainwater main pipe B-2 through a flood discharge gallery of the first initial rainwater regulation and storage pool C and is directly discharged to a natural water body; when the rainfall intensity is large, sewage is diluted by the rainwater at the middle and later stages, mixed water does not enter the sewage main pipe, and is directly discharged to the natural water body after entering the rainwater main pipe, and at the moment, the mixed sewage in the first initial rain regulating and accumulating tank is pumped to the sewage main pipe.

The control method of the embodiment can effectively solve the technical problem that the sewage and the initial rainwater in the urban area directly enter the natural water body due to the non-point source pollution without any transformation of the drainage pipe network in the original unit area in the urban area, and simultaneously solves the technical problems of shortage of urban land, difficult implementation and difficult construction, and greatly shortens construction time and construction cost; the control method of the embodiment also realizes the efficient purification of the initial rainwater by arranging a certain amount of rainwater pretreatment systems or initial rainwater regulating reservoirs on the rainwater main pipe, effectively improves the effective interception of the surface source pollutants, and simultaneously realizes the real-time control of the rainwater pipeline sewage; the control method of the embodiment can effectively split and shut off the initial rainwater through the initial rainwater regulation and storage tank according to the sewage treatment efficiency of the sewage treatment plant, so that the service efficiency of the system is improved.

Example III

As shown in fig. 6, the present embodiment includes a plurality of unit areas a and a town road area B, where the unit area a is a land area including a structure divided by functional use attributes in a city area, and the structure is one of a residential community, an industrial and mining enterprise, an organization, a school, a hospital, or a market. A sewage pipeline A-1 and a rainwater pipeline A-2 are arranged in the unit area A, and a sewage main pipe B-1, a rainwater main pipe B-2 and a municipal rainwater pipeline B-3 are arranged in the municipal road area B; the rainwater pipeline A-2 is communicated with the sewage pipeline A-1; the tail end of the sewage main pipe B-1 is connected with a regulating reservoir 11 and a sewage treatment plant 5, and a municipal rainwater pipeline B-3 is communicated with a rainwater main pipe B-2; the tail end of the rainwater main pipe B-2 is connected with a natural water body 6; the tail end of the sewage pipeline A-1 is connected with the water inlet end of the first diversion well 9, and the sewage outlet end and the purified water outlet end of the first diversion well 9 are respectively communicated with the sewage main pipe B-1 and the rainwater main pipe B-2; the rainwater main pipe B-2 is connected with a second diversion well 10, the water inlet end and the purified water outlet end of the second diversion well 10 are communicated with the rainwater main pipe B-2, and the sewage outlet end of the second diversion well 10 is communicated with the sewage main pipe B-1. The second shunt well 10 may or may not be provided corresponding to the cell.

In the living area, domestic sewage discharged by residents and rainwater collected by the rainwater port 1 are discharged through a rainwater and sewage pipeline, and a first diversion well 9 is arranged for precise control before the domestic sewage and the rainwater are discharged into a municipal drainage pipeline. The end of the sewage main pipe B-1 is provided with a regulating reservoir 11 for collecting sewage and initial rainwater which cannot be treated in time by the sewage treatment plant 5. The second diversion well 10 is arranged on the rainwater main pipe B-2 of the municipal road in a segmented way to accurately control the sewage and rainwater entering the rainwater main pipe B-2.

In sunny days, the sewage discharged from the living area and the sewage entering the municipal rainwater pipeline B-3 are conveyed to the sewage main pipe B-1 by the second diversion well 10, then discharged to the sewage treatment plant 5, and discharged to the natural water body 6 after being treated.

During rainfall, the first diversion well 9 and the second diversion well 3 convey all mixed sewage formed by sewage and initial rainwater to the sewage main pipe B-1 and discharge the mixed sewage to the sewage treatment plant 5 for treatment, if the flow of the mixed sewage exceeds the treatment capacity of the sewage treatment plant 5, the mixed sewage enters the regulation and storage tank 11, and when the sewage treatment plant 5 has the treatment capacity, the mixed sewage is pumped to the sewage treatment plant 5 for treatment. Along with the continuous rainfall, the first diversion well 9 and the second diversion well 10 discharge relatively clean middle and later period rainwater to the natural water body 6 directly through the rainwater main pipe B-2.

The system can accurately control the initial rainwater and the middle-late stage rainwater through the diversion well, fully convey drought sewage and the initial rainwater to the sewage treatment plant 5 for treatment, meanwhile, relatively clean middle-late stage rainwater is not conveyed to the sewage treatment plant 5, the treatment efficiency of the sewage treatment plant 5 is improved, and pollutants entering the natural water body 6 are reduced.

Example IV

As shown in fig. 7 and 8, the pipe network structure of the present embodiment divides a pipe network area into a plurality of unit areas a, and the unit area a is a land area including a structure divided by functional use attributes in a city area, and the structure of the present embodiment is one of sites such as industrial and mining enterprises, institutions, schools, hospitals, and markets. By separating the areas, the area pollution is accurately controlled, and the collection and treatment of the primary rain are accurately controlled.

The pipe network of this embodiment includes sewage trunk B-1 and rainwater trunk B-2, and the export of sewage trunk B-1 is provided with sewage treatment plant 5, and the export of rainwater trunk B-2 communicates with natural water 6, and according to actual conditions, sewage enters into sewage treatment plant 5 through sewage trunk B-1 and carries out integrated treatment, and the rainwater enters into natural water 6 through rainwater trunk B-2.

A plurality of second online rainwater treatment facilities II are arranged between the sewage main pipe B-1 and the rainwater main pipe B-2, and the second online rainwater treatment facilities II can be in one-to-one correspondence with the unit areas A or not in one-to-one correspondence with the unit areas A. The inlet of the second online rainwater treatment facilities II is communicated with the rainwater main pipe B-2, a second sewage discharge pipeline 21 communicated with the sewage main pipe B-1 and a second rainwater discharge pipeline 22 communicated with the rainwater main pipe B-2 are arranged on the outlet of the second online rainwater treatment facilities II, a lower open type weir gate 9 is arranged on the rainwater main pipe B-2 between the inlet of the second online rainwater treatment facilities II and the outlet of the second rainwater discharge pipeline 22, each second online rainwater treatment facility II is provided with a corresponding lower open type weir gate 9, and primary rainwater in the section pipeline can be intercepted and enter the second online rainwater treatment facilities II through closing of the lower open type weir gate 9. The second online rainwater treatment facility can collect and treat the initial rainwater discharged into the rainwater main pipe B-2, so that the initial rainwater is prevented from entering the natural water body 6 to pollute the natural water body 6. A plurality of second online rainwater treatment facilities II are arranged between the sewage main pipe B-1 and the rainwater main pipe B-2, and can be divided and adjusted according to the area of the area.

A sewage pipeline A-1, a rainwater pipeline A-2 (the rainwater pipeline A-2 collects rainwater and non-point source polluted water in the area through a rainwater well arranged in the unit area A) and a rainwater pipeline 18 which are communicated with a structure drain pipe are arranged in the unit area A, and outlets of the sewage pipeline A-1 and the rainwater pipeline A-2 are communicated with an inlet of the rainwater 18. The pipe network structure in the unit area A is a combined system structure, and sewage and rainwater in the unit area A are mixed. The outlet of the storm drain 18 is provided with a first on-line storm water treatment facility i which may be provided in a town area or in a unit area a. The outlet of the first on-line rainwater treatment facility I is provided with a first sewage discharge pipe 19 communicating with the sewage main pipe B-1 and a first rainwater discharge pipe 20 communicating with the rainwater main pipe B-2. The first online rainwater treatment facility I can timely treat the mixed sewage discharged into the rainwater and sewage pipeline 18, can avoid the sewage from being directly discharged into the natural water body 6 to pollute the natural water body 6, and can avoid the load increase of the sewage treatment plant 5 caused by a large amount of sewage entering the sewage treatment plant 5.

The first online rainwater treatment facility I of this embodiment is the same as the second online rainwater treatment facility II in structure, and includes a multifunctional rainwater treatment device, as shown in fig. 8, where the multifunctional rainwater treatment device is one or a combination of several of a buffer pool, a primary rainwater regulation pool and an online treatment regulation pool. Wherein, in order to avoid that the first online rainwater treatment facility discharges into the water body of the rainwater main pipe B-2 to pollute the natural water body 6, the inlet of the second online rainwater treatment facility II is positioned at the downstream of the outlet of the first rainwater discharge pipe 20 of the first online rainwater treatment facility I on the rainwater main pipe B-2. Such an arrangement allows for timely treatment by the second on-line rainwater treatment facility ii, avoiding contaminating the natural water body 6, provided that the water discharged from the first on-line rainwater treatment facility i is not clean.

As shown in fig. 7 and 8, the first on-line rainwater treatment facility i and the second on-line rainwater treatment facility ii of the present embodiment are structured to include a multifunctional rainwater treatment apparatus including a buffer tank 13, a primary rainwater regulation tank 14 and an on-line treatment regulation tank 15, wherein an inlet of the buffer tank 13 of the first on-line rainwater treatment facility i communicates with an outlet of a rainwater pipe a-2 of the unit area a, and the buffer tank 13 of the second on-line rainwater treatment facility communicates with a rainwater main B-2.

The outlet end of the buffer tank 13 is provided with an emergency flood discharge channel 16, a control valve 17 is arranged on the emergency flood discharge channel 16, and the emergency flood discharge channel 16 is used for directly discharging redundant water into the natural water body 6 when the rainfall is very large and the treatment capacity of the online rainwater treatment facility is completely exceeded. The overflow of the buffer tank 13 is communicated with the primary rain regulation and storage tank 14, the overflow of the buffer tank 13 enters the primary rain regulation and storage tank 14 for regulation and storage treatment, and the polluted water in the buffer tank 13 can directly enter the sewage main pipe B-1 for comprehensive treatment through a sewage discharge pipeline. The clean water body of the initial rain regulation and storage tank 14 can enter the natural water body 6 through the emergency flood discharge channel 16, sewage in the initial rain regulation and storage tank 14 can be pumped into the online treatment and storage tank 15 through the water pump for online treatment, the clean water body in the online treatment and storage tank 15 can be directly discharged into the natural water body 6 after being treated, and the rest sewage can enter the sewage main pipe B-1 through the first sewage discharge pipeline 19.

The emergency flood discharge channel 16 is used for directly discharging the water which is not treated by the online rainwater treatment facility into the natural water 6, so as to avoid overload operation of the online rainwater treatment facility. The embodiment collects, controls and processes the primary rain and the non-point source sewage in a concentrated manner by arranging the on-line rainwater treatment facilities, thereby avoiding increasing the load of the sewage treatment plant 5 and avoiding pollution of the natural water body 6 caused by direct discharge.

When the sewage treatment device is used in sunny days, sewage discharged from the unit area A enters the sewage main pipe B-1 through the sewage pipeline A-1, is conveyed to the sewage treatment plant 5 to be treated and then discharged, and sewage entering the rainwater pipeline A-2 also enters the sewage main pipe B-1 through the buffer tank 13, is conveyed to the sewage treatment plant 5 and is treated and then discharged to the natural water body 6. During rainfall, sewage discharged from the unit area A still enters the sewage main pipe B-1 through the sewage pipeline A-1, and is then conveyed to the sewage treatment plant 5 for treatment and then discharged. According to the treatment capacity of the sewage treatment plant 5, part of mixed sewage formed by sewage entering the rainwater pipeline A-2 and initial rainwater enters the sewage main pipe B-1 through the buffer tank 13 and is conveyed to the sewage treatment plant 5 for treatment, and the other part of mixed sewage entering the initial rainwater storage tank 14 enters the initial rainwater storage tank 14 and is pumped to the sewage treatment plant 5 when the sewage treatment plant 5 has the treatment capacity, and is discharged to the natural water body 6 after being treated. Along with the duration of rainfall, when the rainfall intensity is small, part of mixed water formed by middle-late-stage rainwater and sewage can enter a sewage dry pipe B-1 through a buffer pool 13 and is conveyed to a sewage treatment plant 5, the total amount of the mixed water is determined by the treatment capacity of the sewage treatment plant 5, and the rest of mixed sewage enters a rainwater dry pipe B-2 after being treated by an online rainwater treatment pool 4 and is directly discharged to a natural water body 6; when the rainfall intensity is high, the sewage is diluted by the middle-late stage rainwater, the mixed water does not enter the sewage main pipe B-1, but enters the online rainwater treatment tank 4 for treatment and then is discharged to the natural water body 6, and at the moment, the mixed sewage in the primary rainwater regulation tank 14 is pumped to the sewage main pipe B-1; when the rainfall intensity is larger, the flow exceeds the treatment capacity of the online rainwater treatment tank 4, and on the premise of keeping the maximum treatment capacity of the online rainwater treatment tank 4, an emergency flood discharge channel is started to directly discharge flood into the rainwater main pipe B-2.

In actual use, in some places with narrower regions, the online treatment and regulation tank 15 can be removed to save the region area and reduce the volume and the occupied area of the whole multifunctional rainwater treatment device.

For the use of the second online rainwater treatment facility II, when initial rainwater is collected in the rainwater main pipe B-2, the second online rainwater treatment facility II can be started to carry out treatment control, the initial rainwater can be discharged to the sewage main pipe B-1 (when the sewage treatment plant 5 has capacity to treat), the sewage can be treated by itself (when the sewage treatment plant 5 does not have capacity to treat), and the sewage can be directly discharged to the rainwater main pipe B-2 through the emergency flood discharge channel (the rainwater is too large and exceeds the treatment capacity). The second online rainwater treatment facility II is mainly used for controlling the non-point source pollution generated on the municipal road, and can also be used for further regulating and controlling the sewage discharged into the rainwater main pipe B-2 from the unit area A.

It should be understood that the foregoing is only specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes, modifications or substitutions made by those skilled in the art within the technical scope of the present invention should be included in the scope of the present invention.

Claims

1. A surface pollution control system for a combined drainage pipe network system, the system comprising a main sewage pipe, a main rainwater pipe and a rainwater pipeline, and one or more unit areas in which the sewage pipeline and the rainwater pipeline are arranged; the outlets of the sewage pipeline and the rainwater pipeline are communicated with the inlet of the rainwater pipeline;

the sewage main pipe is provided with a first rainwater treatment system, the water inlet end of the first rainwater treatment system is communicated with the rainwater pipeline, and the water outlet end of the first rainwater treatment system is respectively communicated with the sewage main pipe and the rainwater main pipe;

a second rainwater treatment system is arranged on the rainwater main pipe, the water inlet end of the second rainwater treatment system is communicated with the rainwater main pipe, and the water outlet end of the second rainwater treatment system is communicated with the sewage main pipe;

the mixed sewage in the rainwater main pipe is directly discharged to a natural water body or is led into the sewage main pipe after being treated by the second rainwater treatment system.

2. The control system of claim 1, wherein the surface pollution control system of the combined drain pipe network system further comprises a municipal rainwater pipeline in communication with the rainwater main.

3. The control system of claim 2, wherein the municipal rainwater pipeline is located on a municipal road outside the cell.

4. The control system of claim 1, wherein the combined drain pipe network system further comprises one or more parallel or series connected terminal reservoirs at a location of the main sewage pipe proximate to the sewage treatment plant.

5. The control system of claim 1 wherein the area of the cell area is 0.01-0.6 square kilometers.

6. The control system of claim 1, wherein the unit area is a land area including buildings and structures divided by the same or similar attributes of functional use or sewage and rainwater pollution levels in a metropolitan area.

7. The control system of claim 6, wherein the building or structure is selected from one or a combination of two or more of a residential community, an industrial and mining enterprise, an institution, a school, a hospital, a mall, or other unit area that may produce large amounts of sewage.

8. A control system according to claim 6 or 7, wherein the sewer and rainwater pipes are in communication with a drain pipe of a building or structure, respectively.

9. The control system of claim 1, wherein the first rainwater treatment system is selected from one or a combination of two or more of a diverter well, a reject well, a catch well, a regulation facility, or an on-line rainwater treatment facility.

10. The control system of claim 1, wherein the second stormwater treatment system is selected from one or a combination of two or more of a diversion well, a reject well, a catch well, a storage facility, or an on-line stormwater treatment facility.

11. The control system of claim 1, wherein the first stormwater treatment system is one or more in number; when the number of the first rainwater treatment systems is a plurality, the first rainwater treatment systems are installed on pipelines in a serial or parallel manner.

12. The control system according to claim 9, wherein when the second rainwater treatment system is selected from a regulation facility or an on-line rainwater treatment facility, an inlet of the regulation facility or the on-line rainwater treatment facility where the regulation facility or the on-line rainwater treatment facility communicates with the rainwater main is not lower than an outlet of the rainwater main where the rainwater main communicates, and a first water conservancy switch is provided downstream of an inlet of the regulation facility or the on-line rainwater treatment facility; or,

The inlet of the communication part of the regulation facility or the online rainwater treatment facility and the rainwater main pipe is lower than the outlet of the communication part of the rainwater main pipe, and the water inlet end of the regulation facility or the online rainwater treatment facility is not provided with a water conservancy switch;

the combined drainage pipe network system further comprises a rainwater pretreatment system; it is integrated on the rainwater main pipe or arranged beside the rainwater main pipe.

13. The control system of claim 12, wherein the drainage end of the rainwater pretreatment system is in communication with a rainwater main or a natural body of water.

14. The control system according to claim 13, wherein an inlet at which the rainwater pretreatment system communicates with the rainwater main is not lower than an outlet at which the rainwater pretreatment system communicates with the rainwater main, and a second water conservancy switch is provided downstream of the inlet; or, the inlet of the communicating part of the rainwater pretreatment system and the rainwater main pipe is lower than the outlet of the communicating part of the rainwater pretreatment system and the rainwater main pipe.

15. The control system of claim 12, wherein the number of the rain pretreatment systems is one or more; when the number of the rainwater pretreatment systems is plural, the rainwater pretreatment systems are installed on the pipeline in a serial or parallel manner.

16. The control system of claim 9 or 10, wherein the regulation facility is selected from any one or a combination of two or more of a primary rain regulation tank, an overflow regulation tank, a regulation box culvert, and a deep tunnel.

17. A control system according to claim 12, wherein the hydraulic switch is selected from a valve, gate, flap or slice.

18. The control system of claim 17, wherein the hydraulic switch is a ball valve, a shut-off flap valve, an upper open gate, a rotating weir gate, or a lower open weir gate.

19. The control system of claim 9, wherein the on-line stormwater treatment facility is selected from any one or a combination of two or more of an on-line stormwater treatment pond, a sand sedimentation pond, a pass-through pond, and an integrated treatment facility.

20. The control system of claim 12, wherein the rainwater pretreatment system is selected from any one or a combination of two or more of a particle separator, a filter, a rainwater treatment module, or a biological nitrogen and phosphorus removal device.

21. The control system of claim 20, wherein the rainwater pretreatment system is selected from the group consisting of a particle separator, a filter, and a combination of two or more rainwater treatment modules.

22. The control system of claim 21, wherein the rainwater pretreatment system is a particle separator, a filter, and a rainwater treatment module in serial communication.

23. The control system of claim 12, wherein the number and installation of the conditioning facilities, the on-line rainwater treatment facilities and the rainwater pretreatment system are not particularly limited, and are adjustable according to the pollution conditions of the rainwater and the land conditions of each area.

24. The control system according to claim 23, wherein the internal configuration of the storage facility, the on-line rainwater treatment facility, and the rainwater pretreatment system and the manner of installation thereof are not particularly limited, and can be adjusted according to the condition of the rainwater and pollution of each area and the condition of the land.

25. The control system of claim 16, wherein a first primary rain regulation reservoir is disposed on the main sewage pipe, a water inlet end of the first primary rain regulation reservoir is in communication with the rain sewage pipe, and a water outlet end of the first primary rain regulation reservoir is in communication with the main sewage pipe.

26. The control system of claim 25, wherein a second primary rainwater regulation reservoir and a down-opening weir gate are provided on the rainwater main, the water inlet end of the second primary rainwater regulation reservoir is in communication with the rainwater main, the water outlet end of the second primary rainwater regulation reservoir is in communication with the sewage main, and the down-opening weir gate is located downstream of the water inlet end of the second primary rainwater regulation reservoir; and/or the rainwater main pipe is communicated with a rainwater pretreatment system through a branch pipe; the branch pipes are provided with lower open type weir gates, and the lower open type weir gates are positioned at the upstream of the rainwater pretreatment system.

27. The control system of claim 25, wherein one or more first primary rain reservoirs are disposed on the main sewage pipe.

28. The control system of claim 26, wherein one or more second primary rain reservoirs are provided on the rain main, and one of the down-opening weirs is disposed downstream of the water inlet end of the second primary rain reservoir.

29. A surface pollution control method for a combined drainage pipe network system is characterized in that a sewage main pipe is arranged, sewage in a city area is sent to a sewage treatment plant to be treated and then discharged to a natural water body; setting a rainwater main pipe, and discharging rainwater in a city area to a natural water body; a rain and sewage pipeline is arranged, and the outlet of the rain and sewage pipeline is connected with the inlet of a sewage main pipe; the system also comprises one or more unit areas, wherein a sewage pipeline and a rainwater pipeline are arranged in the unit areas; communicating outlets of the sewage pipeline and the rainwater pipeline with inlets of the rainwater pipeline; a sewage treatment plant is arranged at the outlet of the sewage main pipe; the method is characterized in that:

the sewage main pipe is provided with a first rainwater treatment system, the water inlet end of the first rainwater treatment system is communicated with the rainwater pipeline, and the water outlet end of the first rainwater treatment system is respectively communicated with the sewage main pipe and the rainwater main pipe; a second rainwater treatment system is arranged on the rainwater main pipe, the water inlet end of the second rainwater treatment system is communicated with the rainwater main pipe, and the water outlet end of the second rainwater treatment system is communicated with the sewage main pipe; the mixed sewage in the rainwater main pipe is directly discharged to a natural water body or is led into the sewage main pipe after being treated by the second rainwater treatment system.

30. The control method of claim 29, wherein the unit area is a land area including buildings and structures divided by the same or similar attributes of functional use or degree of rain and dirt pollution in a city area.

31. The control method of claim 29, wherein the surface pollution control system of the combined drain pipe network system further comprises a municipal rainwater pipeline, the municipal rainwater pipeline being in communication with the rainwater main; the municipal rainwater pipeline is positioned on the municipal road outside the district.

32. The control method of claim 29, wherein the combined drain pipe network system further comprises one or more parallel or series connected terminal reservoirs at a location of the main sewage pipe adjacent to the sewage treatment plant.

33. The control method of claim 30, wherein the area of the cell area is 0.01-0.6 square kilometers; the building or structure is selected from one or a combination of two or more of residential communities, industrial and mining enterprises, institutions, schools, hospitals, malls or other unit areas that may produce large amounts of sewage.

34. The control method of claim 29, wherein the sewer pipe and the rainwater pipe are respectively communicated with a drain pipe of a building or structure.

35. The control method of claim 29, wherein the first rainwater treatment system is selected from one or a combination of two or more of a diversion well, a reject well, a catch well, a regulation facility, or an on-line rainwater treatment facility; the second rainwater treatment system is selected from one or a combination of more than two of a diversion well, a drainage well, a intercepting well, a regulation facility or an online rainwater treatment facility.

36. The control method of claim 35, wherein the first stormwater treatment system is one or more in number; when the number of the first rainwater treatment systems is a plurality of, the first rainwater treatment systems are installed on the pipeline in a serial or parallel mode; the number of the second rainwater treatment systems is one or more; when the number of the second rainwater treatment systems is a plurality, the second rainwater treatment systems are installed on the pipeline in a serial or parallel manner.

37. The control method according to claim 35, wherein when the second rainwater treatment system is selected from a regulation facility or an online rainwater treatment facility, an inlet of the regulation facility or the online rainwater treatment facility at which the rainwater main communicates is not lower than an outlet of the rainwater main at which the rainwater main communicates, and a first water conservancy switch is provided downstream of an inlet of the regulation facility or the online rainwater treatment facility; or, the inlet of the communicating part of the regulation facility or the online rainwater treatment facility and the rainwater main pipe is lower than the outlet of the communicating part of the rainwater main pipe, and the water inlet end of the regulation facility or the online rainwater treatment facility is not provided with a water conservancy switch.

38. The control method of claim 29, wherein the combined drain pipe network system further comprises a rainwater pretreatment system; it is integrated on the rainwater trunk pipe or arranged beside the rainwater trunk pipe; the drainage end of the rainwater pretreatment system is communicated with a rainwater main pipe or a natural water body;

an inlet at the communication position of the rainwater pretreatment system and the rainwater main pipe is not lower than an outlet at the communication position of the rainwater pretreatment system and the rainwater main pipe, and a second water conservancy switch is arranged at the downstream of the inlet; or the inlet of the communicating position of the rainwater pretreatment system and the rainwater main pipe is lower than the outlet of the communicating position of the rainwater pretreatment system and the rainwater main pipe; the number of the rainwater pretreatment systems is one or more; when the number of the rainwater pretreatment systems is plural, the rainwater pretreatment systems are installed on the pipeline in a serial or parallel manner.

39. The control method of claim 29, wherein the method further comprises:

40. The control method of claim 39, wherein the method further comprises: the mixed sewage in the rainwater main pipe is directly discharged to a natural water body or directly led into the sewage main pipe after being treated by the second rainwater treatment system;

when the rainwater is in the middle and later period, the mixed sewage in the rainwater main pipe is treated by the second rainwater treatment system and then is directly discharged to a natural water body or is led into the sewage main pipe;

and when the rainfall is increased to the upper limit of the treatment capacity of the second rainwater treatment system, the later-stage rainwater in the rainwater main pipe is directly discharged into natural water.

41. The control method of claim 35, wherein the regulation facility is selected from any one or a combination of two or more of a primary rain regulation tank, an overflow regulation tank, a regulation box culvert, and a deep tunnel.

42. The control method of claim 37, wherein the hydraulic switch is selected from a valve, gate, flap, or slice gate;

the online rainwater treatment facility is selected from any one or a combination of more than two of an online rainwater treatment pool, a sand sedimentation pool, a passing pool and integrated treatment equipment.

43. The control method of claim 38, wherein the rainwater pretreatment system is selected from any one or a combination of two or more of a particle separator, a filter, a rainwater treatment module, or a biological nitrogen and phosphorus removal device.

44. The control method according to claim 29, wherein a first primary rain regulation reservoir is arranged on the sewage main pipe, the water inlet end of the first primary rain regulation reservoir is communicated with a rain sewage pipeline, and the water outlet end of the first primary rain regulation reservoir is communicated with the sewage main pipe;

45. The control method of claim 29, wherein the main sewage pipe is provided with one or more first primary rain reservoirs;

one or more second primary rain regulating reservoirs are arranged on the rainwater main pipe, and a downward opening type weir gate is correspondingly arranged at the downstream of the water inlet end of the second primary rain regulating reservoirs.