CN107747345A

CN107747345A - A kind of face pollution control system and its control method for drainage system pipe network system

Info

Publication number: CN107747345A
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: 2018-03-02
Anticipated expiration: 2037-09-06
Also published as: CN107747345B

Abstract

The invention discloses a kind of face pollution control system and its control method for drainage system pipe network system.The system of the present invention includes trunk sewer, Storm-water sewer and rain dirt pipeline, in addition to one or more unit areas, sewage conduct and storm sewer being provided with the unit area；The outlet of the sewage conduct and storm sewer and the inlet communication of the rain dirt pipeline；The outlet of the rain dirt pipeline is connected with the import of trunk sewer, and the outlet of the trunk sewer is provided with sewage treatment plant；The outlet of the Storm-water sewer connects with natural water, it is characterised in that：First rain processing system, water inlet end and the rain dirt pipeline communication of first rain processing system are set on the trunk sewer, and its discharge ends connects with sewage arterial highway and Storm-water sewer respectively.The system and control method of the present invention are simple in construction, it is convenient to build, and it is that the sewage and the efficient process of early-stage rainwater in the regional that is divided in city with administrative functionality can be achieved that shunting processing system need to be only built in the limited region of town road.

Description

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

Technical Field

The invention relates to a surface pollution control system and a control method thereof, belongs to the technical field of distributed source head 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

Urban municipal drainage systems are mainly divided into combined drainage systems and split drainage systems. The earliest combined drainage system mixes domestic sewage, industrial wastewater and rainwater in the same pipe duct, and directly discharges the mixture into water nearby without any treatment, so that the received water suffers from serious pollution, and the combined drainage system is almost adopted in many old cities at home and abroad. A shut-off type combined flow drainage system is now commonly used.

The intercepting type combined drainage system is basically identical in structure to a conventional combined drainage system, and is different from the intercepting type combined drainage system in that a intercepting well is arranged between a municipal combined main pipe and a sewage treatment plant. When the shutoff type combined drainage system works, domestic sewage discharged by residents and rainwater collected by the rainwater openings all enter the municipal combined main pipe through the combined pipeline, and rainwater collected by the rainwater openings along the municipal road also enters the municipal combined main pipe. In sunny days, all sewage is conveyed to a sewage treatment plant and is discharged to natural water after being treated. During rainfall, sewage and rainwater in the early stage of rainfall are also conveyed to a sewage treatment plant and are discharged to a natural water body after being treated. However, with the increase of rainfall, the runoff of rainwater also 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 problem of the combined drainage system is that ① when raining, residential areas and municipal roads can produce non-point source pollution, although the existing combined drainage system is provided with a cut-off well at the tail end for cut-off, the designed cut-off multiple is not enough, so that the cut-off well can not cut off the non-point source pollutants, the non-point source pollutants directly enter natural water and pollute the natural water, ② when controlling the non-point source pollutants, the size of the cut-off well needs to be increased, the size of a cut-off main pipe is increased, the capacity of a sewage treatment plant is increased, the cut-off of the ③ cut-off well is controlled in a rough mode, and initial rainwater can not be accurately cut off.

The confluence drainage system is divided into a complete confluence drainage system and an incomplete confluence drainage system according to different rainwater removal modes, wherein the complete confluence drainage system completely separates rainwater from domestic sewage and industrial sewage and conveys the rainwater through different pipelines, the domestic sewage discharged by residents enters a sewage main pipe through a sewage pipeline and is conveyed to a sewage treatment plant for treatment and then is discharged, the rainwater collected by a rainwater inlet enters the rainwater main pipe through a rainwater pipeline and is directly discharged to a natural water body, the rainwater collected by the rainwater inlet along a municipal road also enters a rainwater main pipe and is directly discharged to the natural water body, and the confluence drainage system has the problems that part of the domestic sewage in ① residential areas mistakenly enters the rainwater pipeline, for example, the domestic sewage discharged by a washing machine on a balcony directly discharges to the natural water body, part of the sewage on ② municipal road mistakenly enters the rainwater, for example, the sewage generated during road cleaning directly discharges to the natural water body ③, the residential areas and the municipal road generate non-source pollution, and the natural non-source pollutants directly enter the natural water body.

The incomplete confluence system mainly aims at rainwater collection and treatment, rainwater collected by a residential area is separated from rainwater collected by a municipal road, domestic sewage discharged by residents and rainwater collected by a rainwater port are discharged through a confluence pipeline, an intercepting well is arranged before the rainwater enters a municipal drainage pipeline for intercepting, rainwater collected by the rainwater port along the municipal road enters a rainwater trunk pipe and is directly discharged to a natural water body, in a fine day, sewage discharged by the residential area is intercepted to the rainwater trunk pipe and is then conveyed to a sewage treatment plant, the rainwater is discharged to the natural water body after treatment, but partial sewage on the municipal road enters the rainwater trunk pipe and is directly discharged to the natural water body, when the rainwater is intercepted, sewage discharged by the residential area and rainwater in the early stage of rainfall are also conveyed to the sewage trunk pipe and are then conveyed to the sewage treatment plant, the rainwater is discharged to the natural water body after treatment, rainwater runoff is increased along with the increase of rainfall, when the flow of the mixed sewage exceeds the water delivery capacity of the intercepting pipeline, the rainwater can not directly enter a sewage treatment plant in the initial stage, the rainwater treatment plant can not effectively intercept pollutants in the initial stage of the rainwater treatment plant, 3556, and can not effectively treat the rainwater in the sewage treatment plant.

In general, the current drainage system has the following problems: first, control of surface source contamination is not possible; secondly, the control is extensive, and the sewage and 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 with tight land, end management cannot be effectively implemented.

The invention discloses a Chinese invention patent with the publication number of CN105625545A and the invention name of 'a regional fragmented rainwater treatment system based on a shunt pipe network', and provides a new pipe network division method to solve the problems. According to the application, the whole pipe network is divided into a plurality of latticed areas according to the area, an independent online rainwater treatment facility is arranged in each area, and rainwater in the areas is comprehensively treated through the online rainwater treatment facilities in the areas. However, after a large number of experiments, the inventor finds that the tail end treatment thought improves the rainwater treatment efficiency and degree in the corresponding area to a certain extent, and controls the non-point source pollution in the area; however, the problem that surface runoff collection is difficult to control accurately still exists, and the time difference exists between the collection of the initial rain at the farthest end and the nearest end of the online rainwater treatment facility, and the collection of the initial rain and surface source pollution cannot be controlled accurately, so that accurate management cannot be achieved. In addition, due to the problem of urban planning, the division of the urban pipe network into grid-shaped areas has a lot of interferences and very high implementation difficulty, which causes great troubles to the urban pipe network arrangement mode of the mode.

Meanwhile, the inventor also finds that the existing regional treatment technology has the following problems that as the division is carried out based on the geographical position, the division of different-purpose facilities such as industry, residential districts, schools and the like into the same region is not considered, so that the sewage in the region has complex components, high difficulty in accurate treatment and separation and higher cost.

Disclosure of Invention

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

The technical scheme of the invention is as follows:

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

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

the rainwater treatment system is characterized in that a first rainwater treatment system is arranged on the sewage main pipe, the water inlet end of the first rainwater treatment system is communicated with the rainwater and sewage pipeline, and the water outlet end of the first rainwater treatment system is respectively communicated with the sewage main pipeline and the rainwater main pipe.

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

According to the present invention, the surface pollution control system of the combined drainage pipe network system further comprises a municipal rainwater pipe which is communicated with the rainwater trunk.

According to the invention, the municipal rainwater pipeline is located on a municipal road outside the community.

According to the invention, the combined drainage pipe network system can also be provided with one or more terminal storage tanks which are connected in parallel or in series at the position of the sewage main pipe close to the sewage treatment plant.

According to the invention, the area of said unit area is 0.01-0.6 square kilometer, preferably 0.01-0.3 square kilometer.

According to the invention, the unit area is a land area which is divided into buildings and structures in urban areas according to the same or similar attributes of functional purposes or sewage and rainwater pollution degrees.

According to the invention, the buildings and structures are selected from one or more than two combinations of residential areas, industrial and mining enterprises, institutions, schools, hospitals, malls or other unit areas which can generate a large amount of sewage.

According to the invention, the sewer pipe and the rainwater pipe are each in communication with a drain 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 abandonment well, a shut-off 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 abandonment well, a shut-off 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, the inlet of the regulation facility or the online rainwater treatment facility, which is communicated with the rainwater trunk pipe, is not lower than the outlet of the rainwater trunk pipe, and a first water conservancy switch is arranged at the downstream of the inlet of the regulation facility or the online rainwater treatment facility; or,

an inlet of a communicated part of the regulation and storage facility or the online rainwater treatment facility and the rainwater trunk pipe is lower than an outlet of the rainwater trunk pipe at the communicated part, and a water conservancy switch is not arranged at a water inlet end of the regulation and storage facility or the online rainwater treatment facility.

According to the invention, the combined drainage pipe network system can also comprise a rainwater pretreatment system; the rainwater pipe can be integrated on the rainwater main pipe or arranged beside the rainwater main pipe;

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

According to the invention, an inlet at the communication part of the rainwater pretreatment system and the rainwater trunk pipe is not lower than an outlet at the communication part of the rainwater pretreatment system and the rainwater trunk pipe, and a second water conservancy switch is arranged at the downstream of the inlet; or,

and an inlet at the communication part of the rainwater pretreatment system and the rainwater trunk pipe is lower than an outlet at the communication part of the rainwater pretreatment system and the rainwater trunk pipe.

According to the invention, the number of the first rainwater treatment systems is one or more; when the number of the first rainwater treatment systems is multiple, the first rainwater treatment systems can be arranged on a pipeline in a serial or parallel mode.

According to the invention, the number of the second rainwater treatment systems is one or more; when the number of the second rainwater treatment systems is multiple, the second rainwater treatment systems can be arranged on a pipeline in a serial or parallel mode.

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

Preferably, the water switch is selected from a valve, a gate, a flap valve or a weir gate; more preferably a ball valve, a closure flap valve, an upwardly opening gate, a rotating weir gate or a downwardly opening weir gate.

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

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

According to the present 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 series or in parallel.

Preferably, the number and installation manner of the storage facilities, the on-line rainwater treatment facilities and the rainwater pretreatment system are not particularly limited, and may be adjusted according to the rainwater and sewage pollution condition and the land use condition of each area.

Preferably, the internal structure and installation manner of the storage facility, the on-line rainwater treatment facility and the rainwater pretreatment system are not particularly limited, and may be adjusted according to the pollution of rainwater and soil conditions in each area.

According to the present invention, when the first rainwater treatment system and the second rainwater treatment system are composed of a plurality of components as described above, the number or the combination and arrangement of the components in the system is not limited, and the purpose of diversion and storage can be achieved.

As an example, in the system of the present invention, a first primary rain regulation tank is disposed on a sewage trunk pipe, a water inlet end of the first primary rain regulation tank is communicated with the sewage trunk pipe, a second primary rain regulation tank and a lower opening weir gate are disposed on the rainwater trunk pipe, a water inlet end of the second primary rain regulation tank is communicated with the rainwater trunk pipe, a water discharge end of the second primary rain regulation tank is communicated with the sewage trunk pipe, and the lower opening weir gate is located at a downstream position of a water inlet end of the second primary rain regulation tank; and/or the rainwater main pipe is communicated with a rainwater pretreatment system through a branch pipe; and the branch pipe is provided with a downward opening weir gate, and the downward opening weir gate is positioned at the upstream of the rainwater pretreatment system.

Preferably, one or more first primary rain regulation tanks are arranged on the sewage main pipe.

Preferably, one or more second primary rain regulation pools are arranged on the rainwater trunk pipe, and one lower open weir gate is correspondingly arranged at the downstream of the water inlet end of each second primary rain regulation pool.

A surface pollution control method for a combined drainage pipe network system comprises the steps of arranging a sewage main pipe, sending sewage in an urban area to a sewage treatment plant for treatment, and then discharging the sewage to a natural water body; arranging a rainwater trunk pipe, and discharging rainwater in the urban area to a natural water body; arranging a rain and sewage pipeline, and connecting an outlet of the rain and sewage pipeline with an inlet of a sewage main pipe; the device also comprises one or more unit areas, wherein sewage pipelines and rainwater pipelines are arranged in the unit areas; communicating outlets of the sewage pipeline and the rainwater pipeline with an inlet of the rainwater and sewage 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 trunk pipe, wherein the water inlet end of the second rainwater treatment system is communicated with the rainwater trunk pipe, and the water outlet end of the second rainwater treatment system is communicated with the sewage trunk pipe.

According to the present invention, the municipal rainwater pipeline is located on a municipal road outside the community. According to the invention, the combined drainage pipe network system can also be provided with one or more terminal storage tanks which are connected in parallel or in series at the position of the sewage main pipe close to the sewage treatment plant.

According to the invention, the method further comprises:

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

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

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

According to the invention, the method further comprises:

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

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

when the rainfall is increased to the upper limit of the treatment capacity of the first rainwater treatment system or the second 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; and later-stage rainwater in the rainwater trunk pipe is directly discharged into a natural water body.

Preferably, the water switch is selected from a valve, a gate, a flap valve or a weir gate; preferably a ball valve, a closure flap valve, an upward opening gate, a rotating weir gate or a downward opening weir gate.

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

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

By way of example, in the system, a first primary rain storage tank is arranged on the sewage main pipe, the water inlet end of the first primary rain storage tank is communicated with the rain and sewage pipeline, and the water outlet end of the first primary rain storage tank is communicated with the sewage main pipe.

A second primary rain storage tank and a lower opening type weir gate are arranged on the rainwater trunk pipe, the water inlet end of the second primary rain storage tank is communicated with the rainwater trunk pipe, the water discharge end of the second primary rain storage tank is communicated with the sewage trunk pipe, and the lower opening type weir gate is positioned at the downstream of the water inlet end of the second primary rain storage tank; and/or the rainwater main pipe is communicated with a rainwater pretreatment system through a branch pipe; and the branch pipe is provided with a downward opening weir gate, and the downward opening weir gate is positioned at the upstream of the rainwater pretreatment system.

The invention has the beneficial effects that:

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

2) The control method of the invention controls the surface pollution, and avoids the condition that rain and sewage in a combined system pipeline can not be effectively separated or the rain and sewage are mixed into a rain and water main pipe due to various reasons, thereby achieving the purpose of high-efficiency pollution discharge and drainage and avoiding the pollution of natural water.

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

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

5) According to the source shunting treatment, the overflowing time of the initial rain from the ground to the storage facility or the shunting well is greatly shortened, so that the probability of mixing later-stage rain water and initial-stage rain water in a source area such as a residential area is reduced, the concentration of the intercepted or collected initial-stage rain water is higher, and the sewage interception efficiency is high.

6) The water receiving area of the existing terminal fragment is 0.4-4 square kilometers, while the water receiving area of the source dispersed cut sewage is only 0.01-0.6 square kilometer.

7) When the end cuts dirty, the long-pending mud of pipeline bottom can influence the characteristic of just rain, lets the not obvious of the characteristic of just rain become, but the source cuts dirty pipeline shorter, and the influence of long-pending mud can be ignored basically, and the characteristic of just rain becomes very obvious.

8) When the tail end intercepts sewage, the distance of the pipeline is long, the damage of the pipeline can cause underground water to permeate along 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 can be ignored basically, and the initial rain concentration of intercepting will also improve greatly.

According to the technical scheme, on the basis that original drainage pipelines in the unit area do not need to be reconstructed, for example, the sewage pipeline and the rainwater pipeline in the unit area can be connected in series by using the primary rain storage tank, so that the non-point source pollutants in the unit area are effectively intercepted, and the interception efficiency of the non-point source pollutants is improved; for example, the primary rain storage tank is used for connecting the sewage main pipe and the rainwater main pipe on the municipal road in series, so that the non-point source pollutants in the municipal road are effectively intercepted, and the interception efficiency of the non-point 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 the sewage to natural water bodies caused by the mixed connection of pipelines; the invention can further improve the treatment efficiency of initial rainwater by arranging a rainwater pretreatment system on the rainwater pipeline and/or the rainwater main pipe; the first initial rain storage tank and the second initial rain storage tank can be arranged in the municipal road area, so that the reconstruction of pipelines in the unit area is effectively avoided, and the problem of shortage of urban land is effectively solved.

Drawings

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

FIG. 2 is a schematic structural view of a prior art method for controlling surface contamination for use in a combined drainage system;

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

FIG. 4 is a schematic structural 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 structural view of a method for controlling surface contamination for a combined drainage system according to a second embodiment of the present invention;

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

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

the reference symbols have the following meanings: 1-a gutter inlet, 2-a particle separator, 3-a filter, 4-a rainwater treatment module, 5-a sewage treatment plant, 6-a natural water body, 7-a catch basin, 8-a municipal confluence pipeline, 9-a downward opening weir gate, 10-a first diversion well, 11-a second diversion well, 12-a regulation pool, 13-a buffer pool, 14-an initial rain regulation pool, 15-an online treatment regulation pool, 16-an emergency flood discharge channel, 17-a control valve, 18-a rainwater pipeline, 19-a first sewage discharge pipeline, 20-a first rainwater discharge pipeline, 21-a second sewage discharge pipeline, 22-a second rainwater discharge pipeline, an A-unit area, a B-a municipal road area, a C-a first initial rain regulation pool, a D-a second initial rain regulation pool, a-1-sewage pipeline, A-2-rainwater pipeline, B-1-sewage main pipe, B-2-rainwater main pipe and B-3-municipal rainwater pipeline.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

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

Example one

As can be seen from the schematic structural view of a divided drain pipe network system for controlling domestic sewage and initial rainwater pollution shown in fig. 4, the present invention includes 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 including structures divided by functional use attributes in urban areas, and the area of the unit areas is 0.3 square kilometer; the structure is one of residential quarters, industrial and mining enterprises or institutions or schools or hospitals or markets, 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 primary rain storage tank C, a first water discharge end of the first primary rain storage tank C is communicated with a sewage main pipe B-1, and a second water discharge end of the first primary rain storage tank C is communicated with a rainwater main pipe B-2; and the rainwater main pipe B-2 is connected with a rainwater port pipeline B-3 on the municipal road.

As shown in fig. 4, in this embodiment, a second primary rain storage tank D and a lower opening weir gate 9 are sequentially communicated with the rainwater trunk B-2, a water inlet end of the second primary rain storage tank D is communicated with the rainwater trunk B-2, a water outlet end of the second primary rain storage tank D is communicated with the sewage trunk B-1, and the lower opening weir gate 9 is located at a downstream of a water inlet end of the second primary rain storage tank D.

In this embodiment, the first primary rain storage tank C includes a buffer tank, a storage tank, and a flood discharge corridor; and the second primary rain regulation pool D comprises a buffer pool and a regulation pool.

Example two

As shown in fig. 5, in this embodiment, the rainwater trunk B-2 is connected to the rainwater pretreatment system through a branch pipe, the branch pipe is provided with a lower opening weir gate 9, and the lower opening 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 rainwater outlets are discharged through sewage pipelines A-1 and rainwater pipelines A-2 in a residential area, and a first primary rainwater storage tank C is arranged before entering municipal drainage pipelines to accurately control and collect sewage and initial rainwater which cannot be timely treated by a sewage treatment plant. And a second primary rain regulation and storage tank D or a rain pretreatment system is also arranged on the rainwater trunk pipe B-2 in a subsection manner to regulate, store or treat the sewage and the rainwater entering the rainwater pipeline.

And in sunny days, sewage discharged from the residential area and sewage entering the municipal rainwater pipeline can enter the sewage main pipe through the buffer tank of the first primary rain storage tank C, then are conveyed to a sewage treatment plant, and are discharged to a natural water body after being treated. During rainfall, according to sewage treatment plant's throughput, sewage and the mixed sewage part of initial stage rainwater formation can get into sewage main pipe B-1 through first just rain regulation pond C's buffer pool, and carry to sewage treatment plant and handle, some can get into second just rain regulation pond D (set up under open weir door 9 and carry out damming, damming to second just rain regulation pond D just rain, just rain damming finishes, under open weir door 9 is opened completely, take natural water to later stage rainwater drainage) or rainwater pretreatment system, the mixed sewage that gets into second just rain regulation pond D can be pump-sent to sewage treatment plant when sewage treatment plant has the throughput, discharge natural water after the processing. And the mixed sewage entering the rainwater pretreatment system can permeate into the ground or be discharged into natural water bodies or be recycled after pretreatment and advanced treatment. 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 particulate matters, oil, grease and the like in rainwater; the filter is used for deep filtration to remove pollutants such as fine particles, nitrogen, phosphorus, heavy metals and the like in the rainwater; the rainwater module is used for collecting the clean rainwater and then is used for infiltration or drainage or recycling. Along with the continuous rainfall, when the rainfall intensity is small, part of mixed water formed by rainwater and sewage in the middle and later periods can enter a sewage main pipe B-1 through a buffer tank of a first initial rainwater storage tank 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 mixed water enters a rainwater main pipe B-2 through a flood discharge corridor of the first initial rainwater storage tank C and is directly discharged to a natural water body; when rainfall intensity is large, sewage is diluted by rainwater in the middle and later periods, mixed water does not enter the sewage main pipe, the mixed water enters the rainwater main pipe and is directly discharged to a natural water body, and the mixed sewage in the first primary rain storage tank is pumped to the sewage main pipe.

The control method of the embodiment does not need to modify the drainage pipe network in the original unit area in the city, and can effectively solve the technical problem that sewage and initial rainwater in the urban area directly enter natural water body due to non-point source pollution only by building a certain number of initial rainwater storage tanks, and simultaneously solve the technical problems of shortage of urban land, difficulty in implementation and difficulty in construction, thereby greatly shortening construction working hours and construction cost; the control method of the embodiment also realizes the high-efficiency purification of initial rainwater by arranging a certain amount of rainwater pretreatment systems or primary rainwater storage tanks through the rainwater trunk pipe, effectively improves the effective interception of surface source pollutants, and simultaneously realizes the real-time control of sewage in the rainwater pipeline; the control method of the embodiment can also effectively divide and cut off initial rainwater through the initial rainwater 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 plurality of town road areas B, where the unit areas a are land areas including structures divided by functional use attributes in a city area, and the structures are one of residential areas, industrial and mining enterprises, institutions, schools, hospitals, or shopping malls. 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 regulation and storage tank 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 a first diversion well 9, and the sewage water outlet end and the clean water outlet end of the first diversion well 9 are respectively communicated with a sewage main pipe B-1 and a rainwater main pipe B-2; the rainwater main pipe B-2 is connected with a second shunt well 10, the water inlet end and the clean water outlet end of the second shunt well 10 are both communicated with the rainwater main pipe B-2, and the sewage outlet end of the second shunt well 10 is communicated with the sewage main pipe B-1. The second diversion well 10 may or may not be located in correspondence with a cell.

In the residential area, resident exhaust domestic sewage and rainwater that rainwater mouth 1 was collected all discharge through the dirty pipeline of rain, set up first reposition of redundant personnel well 9 before getting into municipal drainage pipe and carry out accurate control. The regulation and storage tank 11 is arranged at the tail end of the sewage main pipe B-1 to collect sewage and initial rainwater which cannot be treated by the sewage treatment plant 5 in time. A second diversion well 10 is arranged on the rainwater main pipe B-2 of the municipal road in a subsection mode to accurately control sewage and rainwater entering the rainwater main pipe B-2.

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

When raining, the first shunt well 9 and the second shunt 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 directly discharge the relatively clean middle and later period rainwater to the natural water body 6 through the rainwater trunk pipe B-2.

This system can accurate control initial stage rainwater and middle and later stage rainwater through the reposition of redundant personnel well, carries to sewage treatment plant 5 with the drought sewage and initial stage rainwater is whole to be handled, and the relatively clean middle and later stage rainwater does not carry to sewage treatment plant 5 simultaneously, has improved sewage treatment plant 5's treatment effeciency, has reduced the pollutant that gets into natural water 6.

Example four

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 a land area including structures is divided by functional use attributes in a city area of the unit areas a. By separating the areas independently, the non-point source pollution is accurately controlled, and the collection and treatment of the primary rain are accurately controlled.

The pipe network of the embodiment comprises a sewage main pipe B-1 and a rainwater main pipe B-2, a sewage treatment plant 5 is arranged at the outlet of the sewage main pipe B-1, the outlet of the rainwater main pipe B-2 is communicated with a natural water body 6, according to actual conditions, sewage enters the sewage treatment plant 5 through the sewage main pipe B-1 for comprehensive treatment, and rainwater enters the natural water body 6 through the rainwater main pipe 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 do not need to be in one-to-one correspondence with the unit areas A. The inlet of the second online rainwater treatment facility II is communicated with a rainwater trunk pipe B-2, a second sewage discharge pipeline 21 communicated with the sewage trunk pipe B-1 and a second rainwater discharge pipeline 22 communicated with the rainwater trunk pipe B-2 are arranged on the outlet of the second online rainwater treatment facility II, an open weir gate 9 is arranged on the rainwater trunk pipe B-2 between the inlet of the second online rainwater treatment facility II and the outlet of the second rainwater discharge pipeline 22, each second online rainwater treatment facility II is provided with a corresponding open weir gate 9, and initial rainwater in the section of pipeline can be intercepted and enter the second online rainwater treatment facility II by closing the open weir gate 9. The second online rainwater treatment facility can collect and treat initial rainwater discharged into the rainwater trunk pipe B-2, and 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.

And a sewage pipeline A-1, a rainwater pipeline A-2 and a rainwater pipeline 18 are arranged in the unit area A, wherein the sewage pipeline A-1 is communicated with a structure drain pipe, the rainwater pipeline A-2 is used for collecting rainwater and non-point source polluted water bodies in the unit area A through a rainwater well 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 and sewage 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 rain sewage pipeline 18 is provided with a first online rain water treatment facility I, and the first online rain water treatment facility I can be arranged in a municipal road area or a unit area A. The outlet of the first online rainwater treatment facility I is provided with a first sewage discharge pipeline 19 communicated with the sewage main pipe B-1 and a first rainwater discharge pipeline 20 communicated with the rainwater main pipe B-2. First online rainwater treatment facility I can in time handle the mixed sewage that discharges in the rain sewage pipeline 18, can avoid sewage directly to discharge and pollute natural water 6 in the natural water 6 firstly, can avoid a large amount of sewage to enter into sewage treatment plant 5 and cause the 5 load increases of sewage treatment plant secondly.

The first online rainwater treatment facility I and the second online rainwater treatment facility II of this embodiment are the same in structure, and include multi-functional rainwater treatment device, as shown in fig. 8, multi-functional rainwater treatment device is one or the combination of several of buffer pool, first rain regulation pond or online processing regulation pond. In order to prevent the water discharged into the rainwater trunk pipe B-2 by the first online rainwater treatment facility from polluting the natural water 6, the inlet of at least one second online rainwater treatment facility II is positioned at the downstream of the outlet of the first rainwater discharge pipeline 20 of the first online rainwater treatment facility I on the rainwater trunk pipe B-2. Such setting structure is considered if the water that discharges from first online rainwater processing facility I is unclean, also can carry out timely processing through second online rainwater processing facility II, has avoided polluting natural water 6.

As shown in fig. 7 and 8, the first online rainwater treatment facility i and the second online rainwater treatment facility ii of the present embodiment structurally comprise a multifunctional rainwater treatment device, which comprises a buffer tank 13, a primary rainwater storage tank 14 and an online treatment storage tank 15, wherein an inlet of the buffer tank 13 of the first online rainwater treatment facility i is communicated with an outlet of the rainwater pipeline a-2 of the unit area a, and the buffer tank 13 of the second online rainwater treatment facility is communicated with the rainwater trunk B-2.

The exit end of buffer pool 13 is provided with urgent flood discharge passageway 16, installs control valve 17 on the urgent flood discharge passageway 16, and urgent flood discharge passageway 16 is used for when the rainfall is very big, when having surpassed the throughput of online rainwater processing facility completely, directly discharges the natural water 6 with unnecessary water body in. The overflow of the buffer pool 13 is communicated with the primary rain storage tank 14, the overflow in the buffer pool 13 enters the primary rain storage tank 14 for storage regulation, and the polluted water in the buffer pool 13 can directly enter the sewage main pipe B-1 through a sewage discharge pipeline for comprehensive treatment. The clean water body of the primary rain storage tank 14 can enter the natural water body 6 through the emergency flood discharge channel 16, the sewage in the primary rain storage tank 14 can be pumped into the online treatment storage tank 15 through the water pump for online treatment, the clean water body in the online treatment storage tank 15 can be directly discharged into the natural water body 6 after treatment, 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 water which is not treated by the online rainwater treatment facility to the natural water 6, so that the online rainwater treatment facility is prevented from running in an overload mode. This embodiment is concentrated and is collected control processing to just rain and non-point source sewage through setting up online rainwater treatment facility, has avoided increasing sewage treatment plant 5's load, has also avoided direct emission to cause the pollution of natural water 6.

When the 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, then is conveyed to the sewage treatment plant 5 to be treated and then is discharged, and sewage entering the rainwater pipeline A-2 also enters the sewage main pipe B-1 through the buffer tank 13, then is conveyed to the sewage treatment plant 5 and is discharged to the natural water body 6 after being treated. When raining, the sewage discharged from the unit area A still enters the sewage main pipe B-1 through the sewage pipeline A-1, and then is conveyed to the sewage treatment plant 5 for treatment and then is discharged. According to the treatment capacity of the sewage treatment plant 5, a 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, a part of mixed sewage enters the initial rainwater storage tank 14, the mixed sewage entering the initial rainwater storage tank 14 is pumped to the sewage treatment plant 5 when the sewage treatment plant 5 has the treatment capacity, and the mixed sewage is discharged to the natural water body 6 after treatment. Along with the continuous rainfall, when the rainfall intensity is small, part of mixed water formed by rainwater and sewage in the middle and later periods can enter a sewage main pipe B-1 through a buffer tank 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 mixed sewage is treated by an online rainwater treatment tank 4, enters a rainwater main pipe B-2 and is directly discharged to a natural water body 6; when the rainfall intensity is high, the sewage is diluted by the rainwater in the middle and later periods, 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 initial rainwater storage tank 14 is pumped to the sewage main pipe B-1; when the rainfall intensity is higher, the flow exceeds the processing capacity of the online rainwater treatment pool 4, and on the premise of keeping the maximum processing capacity of the online rainwater treatment pool 4, the emergency flood discharge channel is started to directly discharge the flood into the rainwater trunk pipe B-2.

During practical use, in some places with narrow regions, the on-line treatment storage tank 15 can be removed to save the region area, and the volume and the occupied area of the whole multifunctional rainwater treatment device are reduced.

For the use of the second online rainwater treatment facility II, when initial rainwater is collected in the rainwater trunk pipe B-2, the second online rainwater treatment facility II can be started to carry out treatment control on the initial rainwater, initial rainwater can be discharged to the sewage trunk pipe B-1 (when the sewage treatment plant 5 has the capacity of treatment), the initial rainwater can be automatically treated (when the sewage treatment plant 5 has no capacity of treatment), and the initial rainwater is directly discharged into the rainwater trunk pipe B-2 through the emergency flood discharge channel (the rainwater amount is too large and exceeds the treatment capacity). The second online rainwater treatment facility II is mainly used for controlling non-point source pollution generated on municipal roads and can further regulate and control sewage discharged into the rainwater main pipe B-2 from the unit area A.

It should be understood that the above description is only exemplary of the present invention, but the scope of the present invention is not limited thereto, and any changes, modifications or substitutions that can be made by one skilled in the art within the technical scope of the present invention as disclosed should be covered by the scope of the present invention.

Claims

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

2. The control system of claim 1, wherein a second rainwater treatment system is arranged on the rainwater trunk pipe, a water inlet end of the second rainwater treatment system is communicated with the rainwater trunk pipe, and a water outlet end of the second rainwater treatment system is communicated with the sewage trunk pipe;

preferably, 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 trunk;

preferably, the municipal rainwater pipeline is located on a municipal road outside the community;

preferably, the combined drainage pipe network system can also be provided with one or more terminal storage tanks which are connected in parallel or in series at the position of the sewage main pipe close to the sewage treatment plant;

preferably, the area of the unit area is 0.01 to 0.6 square kilometer, and further preferably 0.01 to 0.3 square kilometer.

3. The control system according to claim 1 or 2, wherein the unit area is a land area including buildings and structures divided in the urban area by the same or similar attributes of functional use or sewage and rainwater pollution levels;

preferably, the building or structure is selected from one or more of residential areas, industrial and mining enterprises, institutions, schools, hospitals, malls or other unit areas that may produce large amounts of sewage;

preferably, the sewage pipeline and the rainwater pipeline are respectively communicated with a drainage pipe of a building or a structure;

preferably, the first rainwater treatment system is selected from one or a combination of more than two of a diversion well, a abandonment well, a shut-off well, a regulation facility or an online rainwater treatment facility;

preferably, the second rainwater treatment system is selected from one or a combination of more than two of a diversion well, a abandonment well, a shut-off well, a regulation facility or an online rainwater treatment facility;

preferably, the number of the first rainwater treatment systems is one or more; when the number of the first rainwater treatment systems is multiple, the first rainwater treatment systems can be arranged on a pipeline in a serial or parallel mode;

preferably, the number of the second rainwater treatment systems is one or more; when the number of the second rainwater treatment systems is multiple, the second rainwater treatment systems can be arranged on a pipeline in a serial or parallel mode;

preferably, 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, which is communicated with the rainwater trunk pipe, is not lower than an outlet of the rainwater trunk pipe, and a first water conservancy switch is arranged at the downstream of the inlet of the regulation facility or the online rainwater treatment facility; or,

an inlet of a communication part of the regulation and storage facility or the online rainwater treatment facility and the rainwater trunk pipe is lower than an outlet of the communication part of the rainwater trunk pipe, and a water conservancy switch is not arranged at a water inlet end of the regulation and storage facility or the online rainwater treatment facility;

preferably, the combined drainage pipe network system can also comprise a rainwater pretreatment system; the rainwater pipe can be integrated on the rainwater main pipe or arranged beside the rainwater main pipe;

preferably, the drainage end of the rainwater pretreatment system is communicated with a rainwater trunk or a natural water body;

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

an inlet at the position where the rainwater pretreatment system is communicated with the rainwater trunk pipe is lower than an outlet at the position where the rainwater pretreatment system is communicated with the rainwater trunk 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 series or in parallel.

4. The control system of any one of claims 1 to 3, wherein the storage facilities are selected from any one or a combination of two or more of an initial rain storage tank, an overflow storage tank, a storage box culvert and a deep tunnel;

preferably, the water switch is selected from a valve, a gate, a flap valve or a weir gate; more preferably a ball valve, a closure flap valve, an upward opening gate, a rotary weir gate or a downward opening weir gate;

preferably, the online rainwater treatment facility is selected from any one or a combination of more than two of an online rainwater treatment tank, a desilting tank, a passing tank and an integrated treatment device;

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 biological nitrogen and phosphorus removal equipment, 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 further preferably, the particle separator, the filter and the rainwater treatment module are sequentially communicated in series;

preferably, the number and installation manner of the storage facilities, the online rainwater treatment facilities and the rainwater pretreatment systems are not particularly limited, and the storage facilities, the online rainwater treatment facilities and the rainwater pretreatment systems can be adjusted according to the rainwater and sewage pollution condition and the land use condition of each area;

preferably, the internal structure and installation manner of the storage facility, the online rainwater treatment facility and the rainwater pretreatment system are not particularly limited, and can be adjusted according to the rainwater and sewage pollution condition and land use condition of each area;

preferably, when the first rainwater treatment system and the second rainwater treatment system are composed of a plurality of components as described above, the number or the combination arrangement mode of the components in the system is not limited, and the purpose of shunting and regulating the rainwater is achieved.

5. The control system of any one of claims 1-4, wherein a first primary rain storage tank is arranged on the sewage main pipe, a water inlet end of the first primary rain storage tank is communicated with a rain and sewage pipeline, and a water outlet end of the first primary rain storage tank is communicated with the sewage main pipe; preferably, a second primary rain regulation and storage tank and a lower opening weir gate are arranged on the rainwater trunk pipe, a water inlet end of the second primary rain regulation and storage tank is communicated with the rainwater trunk pipe, a water discharge end of the second primary rain regulation and storage tank is communicated with the sewage trunk pipe, and the lower opening weir gate is positioned at the downstream of the water inlet end of the second primary rain regulation and storage tank; and/or the rainwater main pipe is communicated with a rainwater pretreatment system through a branch pipe; the branch pipe is provided with a lower open weir gate, and the lower open weir gate is positioned at the upstream of the rainwater pretreatment system;

preferably, one or more first primary rain regulation tanks are arranged on the sewage main pipe;

6. A surface pollution control method for a combined drainage pipe network system is characterized in that a sewage main pipe is arranged, and sewage in an urban area is sent to a sewage treatment plant for treatment and then discharged to a natural water body; arranging a rainwater trunk pipe, and discharging rainwater in the urban area to a natural water body; arranging a rain and sewage pipeline, and connecting an outlet of the rain and sewage pipeline with an inlet of a sewage main pipe; the device also comprises one or more unit areas, wherein sewage pipelines and rainwater pipelines are arranged in the unit areas; communicating outlets of the sewage pipeline and the rainwater pipeline with an inlet of the rainwater and sewage pipeline; a sewage treatment plant is arranged at the outlet of the sewage main pipe; the method is characterized in that:

7. The control method according to claim 6, wherein the unit area is a land area including buildings and structures divided in the same or similar attributes of functional use or rain pollution degree in the urban area;

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

preferably, the municipal rainwater pipeline is located on a municipal road outside the community

preferably, the area of the unit area is 0.01 to 0.6 square kilometer, and further preferably 0.01 to 0.3 square kilometer;

preferably, the sewage pipeline and the rainwater pipeline are respectively communicated with a drainage pipe of a building or a structure; preferably, the first rainwater treatment system is selected from one or a combination of more than two of a diversion well, a abandonment well, a shut-off well, a regulation facility or an online rainwater treatment facility;

preferably, 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 series or in parallel.

8. The control method according to claim 6 or 7, characterized in that the method further comprises:

9. The control method according to any one of claims 6 to 8, characterized in that the method further comprises: the mixed sewage in the rainwater trunk pipe is treated by the second rainwater treatment system and then is directly discharged to a natural water body or is directly introduced into the sewage trunk pipe;

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

when the rainfall is increased to the upper limit of the processing capacity of the second rainwater processing system, later stage rainwater in the rainwater trunk pipe is directly discharged into a natural water body.

10. The control method according to any one of claims 6 to 9, wherein the storage facility is selected from any one or a combination of two or more of an initial rain storage tank, an overflow storage tank, a storage box culvert and a deep tunnel;

preferably, the water switch is selected from a valve, a gate, a flap valve or a weir gate; preferably a ball valve, a closure flap valve, an upper opening type gate, a rotary weir gate or a lower opening type 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 biological nitrogen and phosphorus removal equipment, 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 communicated in series;

preferably, when the first rainwater treatment system and the second rainwater treatment system are composed of a plurality of components, the number or the combination arrangement mode of the components in the system is not limited, and the purpose of shunting and regulating storage is achieved;

preferably, a first primary rain storage tank is arranged on the sewage main pipe, a water inlet end of the first primary rain storage tank is communicated with a rain and sewage pipeline, and a water discharge end of the first primary rain storage tank is communicated with the sewage main pipe;

a second primary rain storage tank and a lower opening type weir gate are arranged on the rainwater trunk pipe, the water inlet end of the second primary rain storage tank is communicated with the rainwater trunk pipe, the water discharge end of the second primary rain storage tank is communicated with the sewage trunk pipe, and the lower opening type weir gate is positioned at the downstream of the water inlet end of the second primary rain storage tank; and/or the rainwater main pipe is communicated with a rainwater pretreatment system through a branch pipe; the branch pipe is provided with a lower open weir gate, and the lower open weir gate is positioned at the upstream of the rainwater pretreatment system;