CN112851022A

CN112851022A - First rain clean system

Info

Publication number: CN112851022A
Application number: CN202110004417.5A
Authority: CN
Inventors: 易升泽; 杜建军; 詹燕妮
Original assignee: PowerChina Eco Environmental Group Co Ltd
Current assignee: PowerChina Eco Environmental Group Co Ltd
Priority date: 2021-01-04
Filing date: 2021-01-04
Publication date: 2021-05-28
Anticipated expiration: 2041-01-04
Also published as: CN112851022B

Abstract

The invention relates to the technical field of urban non-point source pollution treatment, and provides a primary rain purification system, wherein an existing drainage open trench/cover trench of a city is utilized, an outer well is arranged at the bottom of the trench, and a sediment tank for filtering is arranged at the top of the outer well, so that the problems that existing primary rain purification facilities such as a primary rain storage pond, an intelligent abandoning well and the like have large land and are difficult to implement are solved, and the construction cost is greatly reduced; a first filter screen is arranged at the top of the slag settling tank, and coarse and large impurities in the primary rain are removed through the slag settling and filtering effects of the slag settling tank; the coaxial mesophragma standpipe that sets up in outer well inside, mesophragma standpipe inside is filled there is first rain purifying material, has realized the further purification of first rain through absorption, microbial degradation etc. effect of first rain purifying material, and the first rain after the purification permeates the stratum through the infiltration hole of mesophragma standpipe bottom and outer well bottom, make full use of the purifying power of nature stratum to quality of water, realizes further deep purification to first rain, greatly reduced engineering implementation cost.

Description

First rain clean system

Technical Field

The invention relates to the technical field of urban non-point source pollution treatment, in particular to a primary rain purification system.

Background

At present, a large amount of urban non-point source pollutants are carried by rainwater to enter a river water body, so that the serious pollution of the water quality of the river is caused, and the rainfall runoff pollution becomes the second largest non-point source pollution which is only second to agricultural non-point source pollution. The existing various sponge urban ecological measures still have certain disadvantages, such as the traditional grass planting ditch mainly aims at natural water seepage, and runoff reduction is limited; the traditional small ecological wetland is mainly arranged in a flat and open area or a small area, so that water quality deterioration, mosquito breeding and regional environment influence are easily caused; although the rain garden has good landscape effect, the rain garden is limited by urban land and is difficult to popularize in a large range; the primary rain storage tank is also severely limited by urban land resources and is difficult to be widely applied; the intelligent abandoning well has high construction cost and high maintenance cost, and the COD and BOD values of the sewage system can be reduced after the intelligent abandoning well abandons the sewage system, so that the intelligent abandoning well is not beneficial to sewage treatment plants to treat sewage, and the cost of sewage treatment is greatly increased. Therefore, it is necessary to develop a primary rain purification system with small floor space and low cost.

Disclosure of Invention

The invention aims to provide a primary rain purification system, and aims to solve the technical problems that the primary rain purification system is complex, large in occupied area and high in construction cost in the prior art.

In order to solve the above technical problem, the present invention provides an initial rain purification system, including:

the slag settling tank is arranged at the bottom of the open drain or the cover plate ditch, a first filter screen is arranged at the top of the slag settling tank, and water passing holes for water flow to pass through are formed in the bottom of the slag settling tank;

the outer well is vertically arranged at the bottom of the slag settling tank;

the mesophragma standpipe, coaxial set up in inside the outer well, and the top with cross the water hole intercommunication, the inside packing of mesophragma standpipe has first rain purifying material, the bottom of mesophragma standpipe with the infiltration hole has all been seted up to the bottom of outer well, first rain converge to in drainage open ditch or the apron ditch, get into the sediment groove filters the back, through cross the water hole entering mesophragma standpipe purifies, and the first rain after the purification passes through infiltration hole infiltration stratum.

Further, the septum standpipe comprises a first septum standpipe and a second septum standpipe, the first septum standpipe is coaxially arranged inside the second septum standpipe, and gaps are formed between the pipe wall of the first septum standpipe and the pipe wall of the second septum standpipe and between the pipe wall of the second septum standpipe and the pipe wall of the outer well.

Further, the interior of the first septal standpipe and the interior of the gap are filled with at least one primary rain purification material.

Furthermore, the infiltration hole is including seting up in the first infiltration hole of first mesophragma standpipe bottom, seting up in the second infiltration hole of second mesophragma standpipe bottom and seting up in the third infiltration hole of outer well bottom, the quantity in second infiltration hole is less than the quantity in first infiltration hole.

Further, the top of the first septal standpipe extends to the bottom of the slag chute, and the top of the second septal standpipe is lower than the top of the first septal standpipe and the top of the outer well.

Further, the depth range of the outer well is 4-10 meters.

Furthermore, a second filter screen is arranged at the water passing hole, and the aperture of the second filter screen is smaller than that of the first filter screen.

Further, the arrangement depth range of the slag settling tank is 5-15 cm.

Furthermore, the bottom of the slag settling groove is provided with a water blocking fixing part for preventing the initial rain in the slag settling groove from directly entering the first middle separation vertical pipe.

Further, the primary rain purification material is coated with geotextile.

The primary rain purification system provided by the invention has the beneficial effects that: compared with the prior art, the initial rain purification system provided by the invention utilizes the existing urban drainage open ditches/cover plate ditches or newly builds drainage open ditches/cover plate ditches at proper positions, an outer well is arranged at the bottom of the ditch, and a sediment tank for filtering is arranged at the top of the outer well, so that the problems that the existing initial rain purification facilities such as an initial rain storage pond and an intelligent drainage well are large in land and difficult to implement are solved, and the construction cost is greatly reduced; a first filter screen is arranged at the top of the slag settling tank, and coarse and large impurities in the primary rain are removed through the slag settling and filtering effects of the slag settling tank; the coaxial mesophragma standpipe that sets up in outer well inside, mesophragma standpipe inside is filled there is first rain purifying material, through first rain purifying material's absorption, the further purification of first rain has been realized to effects such as microbial degradation, first rain after the purification permeates the stratum through the infiltration hole of mesophragma standpipe bottom and outer well bottom, make full use of the drainage ability on natural stratum and to the purifying power of quality of water, realize further deep purification to first rain, greatly reduced engineering implementation cost.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that are needed in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:

FIG. 1 is a schematic view of the construction of an initial rain purification system according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of an embodiment of an initial rain purification system;

FIG. 3 is a schematic view of the configuration of the sludge tank of FIG. 1;

FIG. 4 is a top view of an embodiment of an external well and septal standpipe configuration;

FIG. 5 is a schematic view of the first septal standpipe of FIG. 4.

Description of reference numerals:

1. a drainage open ditch or a cover plate ditch; 2. a slag settling tank; 21. a first filter screen; 22. water passing holes; 23. a second filter screen; 24. a water blocking fixing member; 3. an outer well; 31. a third water seepage hole; 4. a septal standpipe; 41. a first septal standpipe; 411. a first water seepage hole; 42. a second septal standpipe; 421. a second water seepage hole; 43. a primary rain purification material; 44. a gap; 5. a first earth formation; 6. a second earth formation; 7. a third formation.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

In the present invention, unless otherwise explicitly specified or limited, the terms "connected", "communicating", and the like are to be understood broadly, and may be, for example, mechanically or electrically connected; the connection may be direct, indirect or internal, or may be a connection between two elements or an interaction relationship between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

Preferred embodiments of the present invention are described below with reference to the accompanying drawings:

the initial rain purification system can be applied to the scenes of initial rain purification treatment, urban non-point source pollution treatment, sponge city construction, urban waterlogging treatment and the like. Aiming at the problems of non-point source pollution on two sides of an urban river and serious initial rain runoff pollution, the initial rain purification system can be implemented by checking geological survey data or discovering that medium-coarse sand strata (the permeability coefficient K is more than 0.006cm/s and the medium-coarse sand strata exist on two sides of the river) exist in the range of buried depth of 10 meters through geological drilling, and utilizing the existing open drainage ditch/cover plate ditch or newly building open drainage ditch/cover plate ditch and then utilizing natural relatively permeable strata (generally medium-coarse sand strata).

As shown in fig. 1 and 2, in this embodiment, the primary rain purification system is a multifunctional vertical primary rain purification well, the multifunctional vertical primary rain purification well specifically includes a sediment tank 2, an outer well 3 and a middle partition vertical pipe 4, the sediment tank 2 is disposed at the bottom of the open drain or cover ditch 1, a first filter screen 21 is disposed at the top of the sediment tank 2, and a water through hole 22 for water to pass through is disposed at the bottom of the sediment tank 2; the outer well is vertically arranged at the bottom of the slag settling tank 2, and the specific burial depth of the outer well 3 is determined according to the burial depth of the medium-coarse sand stratum; optionally, the slag settling tank 2 is a plastic part, and of course, the slag settling tank 2 made of other materials may be selected according to the requirement, such as a stainless steel part, and the like, which is not limited herein. Sediment groove 2 is arranged in filtering, deposits big well granule impurity that carries in the rain just, and the first filter screen 21 at 2 tops in sediment groove covers the open area in top of sediment groove 2, plays primary filterable effect, and preferably, first filter screen 21 is the stainless steel filter screen, and the stainless steel filter screen is compared in the firm reliability of the filter screen of other materials, and reducible maintenance frequency in sediment groove 2, and in long-term use, can not rust. The bottom of the sediment tank 2 is provided with a water through hole 22 for water flow to pass through, preferably, the aperture of the water through hole 22 is smaller than that of the first filter screen 21 so as to block the impurities of the first rain which pass through the smaller particles of the first filter screen 21. The primary rain in the sediment tank 2 enters the outer well 3 through the water through holes 22.

Sediment groove 2 can be dismantled and set up, when filtering, depositing coarse grain impurity in just raining, can conveniently carry out regular clearance to sediment groove 2 and maintain to ensure purifying effect. The manner of detachable connection is not particularly limited.

Specifically, the intermediate vertical pipe 4 is coaxially arranged inside the outer well 3, the top of the intermediate vertical pipe is communicated with the water through hole 22, and the primary rain purification material 43 is filled inside the intermediate vertical pipe 4; the main function of the septal standpipe 4 filled with the primary rain purification material 43 is to further purify the primary rain flowing down from the debris basin 2. The bottom of mesophragma standpipe 4 and the bottom of outer well 3 have all been seted up the infiltration hole and have been used for the first rain after the purification of first rain purification material 43 to flow out to enter into the stratum. The water seepage holes enable the outer well 3 to be communicated with a relatively permeable stratum (medium coarse sand stratum), the opening range of the bottom ends of the middle partition vertical pipes 4 and the outer well 3 is matched with the buried depth range of the relatively permeable stratum (medium coarse sand stratum), the water seepage holes can be opened on the well wall and the well bottom of the outer well 3 and the pipe wall and the pipe bottom of the middle partition vertical pipes 4, the diameter range of the water seepage holes can be selected to be 4-10mm, and of course, under other conditions, the diameter range of the water seepage holes can be other size ranges, and the diameter range is not limited uniquely.

Specifically, the formation may be divided into a first formation 5 (with a permeability coefficient of K1), a second formation 6 (with a permeability coefficient of K2), and a third formation 7 (with a permeability coefficient of K3) from top to bottom according to differences in permeability coefficients of the formation, where K1, K2 < K3. The outer well 3 extends from the first and

second strata

5, 6 to the third strata 7. And discharging the purified primary rain into the urban water body through the third stratum 7 by utilizing the natural characteristic of the third stratum 7 with larger permeability coefficient.

Optionally, in this embodiment, the outer well 3 is a steel pipe (sprayed with an anti-rust layer), the burial depth depends on the burial depth of the medium-coarse sand formation, and the middle separation standpipe 4 is a PVC pipe, however, the specific materials of the outer well 3 and the middle separation standpipe 4 may be other types as required, and this is not limited herein.

As shown in fig. 1 and 2, the direction indicated by the arrow in the figure is the water flow direction, and the process of purifying the primary rain is as follows: the initial rain converges to the open drain or the cover plate ditch 1, at first, the sediment groove 2 is discharged into through first filter screen 21, first filter screen 21 filters out the major possession rubbish debris in the initial rain, sediment groove 2 deposits the large and medium-sized particulate matter that carries in the initial rain, initial rain after the sediment gets into the interior of mesophragma standpipe 4 of outer well 3 through water hole 22, the first rain purifying material 43 in the mesophragma standpipe 4 plays the purifying effect, the initial rain after the purification of the first rain purifying material 43 passes through infiltration hole infiltration third stratum 7, carry out further deep purification to the initial rain by well coarse sand layer, effectively ensured that the initial rain gets into city water in vivo or other earth's surfaces, in the groundwater again after purifying to water quality standard.

The initial rain purification system of the embodiment utilizes the existing urban drainage open ditches or cover plate ditches 1 or newly builds the drainage open ditches or cover plate ditches 1 at proper positions, an outer well 3 is arranged at the bottom of the ditches, and a sediment tank 2 for filtering is arranged at the top of the outer well 3, so that the problems that the existing initial rain purification facilities such as an initial rain regulation pool, an intelligent drainage well and the like have large land and are difficult to implement are solved, and meanwhile, the construction cost is greatly reduced; the top of the slag settling tank 2 is provided with a first filter screen 21, and thicker and larger impurity particles in the primary rain are removed through the filtering and slag settling effects of the slag settling tank 2; outer 3 inside coaxial settings mesophragma standpipe 4 of well, 4 inside packings in mesophragma standpipe have first rain purification material 43, through the absorption of first rain purification material 43, the further purification of first rain has been realized to effects such as microbial degradation, first rain after the purification permeates the stratum through the infiltration hole of 4 bottoms in mesophragma standpipe and outer 3 bottoms of well, make full use of the drainage ability on natural stratum and to the purifying capacity of quality of water, realize further deep purification to first rain, greatly reduced engineering implementation cost.

As shown in fig. 2 and 4, in the present embodiment, the septum standpipe 4 includes a first septum standpipe 41 and a second septum standpipe 42, the first septum standpipe 41 is coaxially disposed inside the second septum standpipe 42, and gaps 44 are respectively formed between the wall of the first septum standpipe 41 and the wall of the second septum standpipe 42, and between the wall of the second septum standpipe 42 and the wall of the external well 3.

Specifically, as shown in fig. 2 and 4, in this embodiment, two intermediate vertical pipes, namely, a first intermediate vertical pipe 41 and a second intermediate vertical pipe 42, are concentrically arranged in the outer well 3 with respect to the outer well 3, the first intermediate vertical pipe 41 is located at the middle, the second intermediate vertical pipe 42 is located between the first intermediate vertical pipe 41 and the outer well 3, and gaps 44 are left among the outer well 3, the second intermediate vertical pipe 42, and the first intermediate vertical pipe 41 for filling the primary rain purification material 43. Through setting up two mesophragma standpipe, adopt first rain purifying material 43 to purify first rain many times to further improve purifying effect.

In one embodiment, the interior of first septal standpipe 41 and the interior of gap 44 are filled with at least one primary rain purification material 43.

Specifically, the initial rain purification material 43 filled in the first septal standpipe 41 and the gap 44 may be one type, or may be a plurality of types of purification materials alternately filled, and the initial rain purification material 43 may be an active adsorption material or a microorganism carrier material, such as zeolite and activated carbon material alternately filled, or may be a single zeolite material or a single activated carbon material, and different purification materials may be selectively filled according to actual needs, so as to achieve an optimal purification effect on the initial rain. The specific type and filling manner of the primary rain purification material 43 are not particularly limited.

Optionally, in an embodiment, the interior of the first septal standpipe 41 is filled with a zeolite material, the zeolite has ion exchange property, adsorptive separation property, catalytic property, stability, chemical reactivity, reversible dehydration property, electrical conductivity and other properties, the zeolite contains a large number of cavities and pores, has large openness and internal surface area, and is a high-quality natural microorganism carrier material, and in this embodiment, the initial rainwater is purified mainly through biodegradation of microorganisms propagated on the zeolite; activated carbon is filled in gaps 44 between the pipe wall of the first middle separation vertical pipe 41 and the pipe wall of the second middle separation vertical pipe 42 and between the pipe wall of the second middle separation vertical pipe 42 and the pipe wall of the outer well 3, the activated carbon is prepared by pyrolyzing and activating carbon-containing raw materials such as wood, coal, petroleum coke and the like, has a developed pore structure, a large specific surface area and abundant surface chemical groups, and is a general name of a carbon material with strong specific adsorption capacity, and the initial rainwater is further purified mainly through the adsorption effect of the activated carbon in the embodiment.

As shown in fig. 2 and 5, in the present embodiment, the water seepage holes include a first water seepage hole 411 opened at the bottom end of the first middle partition vertical pipe 41, a second water seepage hole 421 opened at the bottom end of the second middle partition vertical pipe 42, and a third water seepage hole 31 opened at the bottom end of the outer well 3, and the number of the second water seepage holes 421 is less than the number of the first water seepage holes 411.

Specifically, as shown in fig. 5, the first water seepage hole 411, the second water seepage hole 421 and the third water seepage hole 31 are opened in a buried depth range of a relatively permeable stratum (medium-coarse sand stratum), and the diameter range of each water seepage hole may be selected to be 4-10mm, and of course, in other cases, the diameter range of each water seepage hole may also be other size ranges, and is not limited herein.

Specifically, in this embodiment, the first water seepage holes 411 at the bottom end of the first intermediate vertical pipe 41 may allow the initial rain entering the first intermediate vertical pipe 41 to seep into the second intermediate vertical pipe 42 from the first water seepage holes 411 after being purified by the initial rain purification material 43, and after the rain enters the second intermediate vertical pipe 42, since the number of the second water seepage holes 421 at the bottom end of the second intermediate vertical pipe 42 is less than the number of the first water seepage holes 411, most of the initial rain rises in the second intermediate vertical pipe 42, and a small part of the initial rain seeps into the outer well 3 through the second water seepage holes 421, and is discharged into the corresponding stratum through the third water seepage holes 31 at the bottom end of the outer well 3 after being purified by the initial rain purification material 43 inside the outer well 3.

In the present embodiment, the top of the first septal standpipe 41 extends to the bottom of the detritus tank 2, and the top of the second septal standpipe 42 is lower than the top of the first septal standpipe 41 and the top of the outer well 3, as shown in fig. 2.

Specifically, the top of the second septal standpipe 42 is about 20-30cm lower than the top of the outer well 3 and the top of the first septal standpipe 41, and a small amount of second weep holes 421 are provided at the bottom of the second septal standpipe 42 to mainly drain accumulated water in the two septal standpipes.

In the present embodiment, the depth of the outer well 3 is preferably in the range of 4-10m according to the burial depth range of the relatively permeable formation (medium coarse sand formation), although in other cases, it may be beyond the burial depth range, and the only limitation is not made here.

Preferably, as shown in fig. 3, in the present embodiment, a second filter 23 is disposed at the water through hole 22 at the bottom of the sediment tank 2, and the aperture of the second filter 23 is smaller than that of the first filter 21.

Specifically, second filter screen 23 and the same optional stainless steel of first filter screen 21, second filter screen 23 sets up in the bottom of sediment groove 2, a be used for the back cover, its aperture is less than first filter screen 21's aperture, water filtering capacity is lower, when normally carrying out purification treatment to just rain, the lower second filter screen 23 of water filtering capacity can be favorable to delaying the inside speed of first well septum standpipe 41 of rain flow direction, make sediment groove 2 inside first rain through the process of deposiing, will just the major possession particulate matter in the rain precipitate in the bottom of sediment groove 2, first rain after the sediment is through second filter screen 23 entering first well septum standpipe 41 inside further purification that carries on.

Preferably, in order to further reduce the water filtering capacity of the second filter screen 23 and reduce the amount of coarse impurities entering the inside of the first intermediate standpipe 41, thereby delaying the speed at which the first rain purification material 43 in the first intermediate standpipe 41 is blocked by the particulate matter carried by the first rain, and ensuring the purification effect, the second filter screen 23 may be further coated with geotextile.

Preferably, in the embodiment, the arrangement depth of the slag settling tank 2 is in the range of 5-15 cm. Of course, other buried depth ranges can be selected according to actual construction needs, and are not particularly limited herein.

As shown in fig. 2 and 3, the bottom of the slag chute 2 is provided with a water blocking fixing member 24 for preventing the primary rain in the slag chute 2 from directly entering the first septal standpipe 41.

Specifically, the mounting 24 that blocks water sets up in the bottom of sediment groove 2 mainly used prevents that the rainwater that flows into sediment groove 2 can not directly flow into first mesophragma standpipe 41, but through blocking water, make first rain obtain precipitating in sediment groove 2 is inside, let the big well particulate matter that first rain carried precipitate, thereby reduce the volume that enters into the particulate matter in first mesophragma standpipe 41, thereby delay the speed that first rain purification material 43 in first mesophragma standpipe 41 is blockked up, and the purification performance is improved, and it is convenient to clear up sediment groove 2 simultaneously also.

Preferably, in an embodiment, in order to prevent the particles of the initial rain purification material 43 from flowing and blocking the respective seepage holes under the washing of the initial rain, the initial rain purification material 43 may be wrapped with geotextile, and if a plurality of initial rain purification materials 43 are alternately filled in sections, each of the initial rain purification materials 43 is wrapped with geotextile, respectively. The geotextile can play a certain role in filtering and purifying while fixing the particles of the initial rain purification material 43.

As shown in fig. 2, in an embodiment, the purification process of the initial rain purification system of the present invention is as follows: after rain, the initial rain firstly enters the sediment tank 2, enters the first middle partition vertical pipe 41 at the middle after the filtering action and the precipitating action, slowly infiltrates into the active carbon layer of the adjacent second middle partition vertical pipe 42 through the zeolite filter material in the first middle partition vertical pipe 41 due to the action of a water head difference, then rises to the top of the second middle partition vertical pipe 42 along the second middle partition vertical pipe 42, enters the active carbon filter material layer close to the outer well 3, then infiltrates, finally flows into the medium coarse sand layer through the third seepage hole 31 of the well wall of the outer well 3, and finally is discharged into urban water or other earth surfaces and underground water, the medium coarse sand layer further deeply purifies the initial rain at the same time, and the initial rain quality is effectively ensured to reach the standard and then enters the urban water. A small amount of second weep holes 421 in second septal standpipe 42 may facilitate draining of accumulated water between first septal standpipe 41 and second septal standpipe 42.

According to the initial rain purification system, the existing open drainage ditches or cover plate ditches 1 on two banks of the urban river or the newly-built open drainage ditches or cover plate ditches 1 at a proper position are utilized, the outer well 3 is arranged at the bottom of the ditch, and the sediment tank 2 for filtering is arranged at the top of the outer well 3, so that the problems that the existing initial rain purification facilities such as an initial rain regulation pool and an intelligent drainage well are large in land and difficult to implement are solved, and meanwhile, the construction cost is greatly reduced; by utilizing the filtering and precipitating effects of the sediment tank 2, the biodegradation effect of microorganisms propagated on zeolite in the outer well 3, the first middle partition standpipe 41 and the second middle partition standpipe 42 and the adsorption effect of activated carbon, urban non-point source pollution is mainly collected and purified in sunny days, initial rainwater is mainly collected and purified in rainy days, non-point source pollution and initial rainwater pollution of urban rivers and lakes can be effectively reduced, and the water quality of urban water bodies is boosted and maintained; the purification capacity and the overflowing capacity of the coarse sand stratum in the two banks of the river channel, which are natural resources, on water quality are fully utilized, the implementation cost of the primary rain purification project is greatly reduced, and the possibility is provided for the popularization of the primary rain purification project.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A primary rain purification system, comprising:

the outer well is vertically arranged at the bottom of the slag settling tank;

2. The primary rain purification system of claim 1, wherein the septal standpipe comprises a first septal standpipe and a second septal standpipe, the first septal standpipe is coaxially disposed within the second septal standpipe, and a gap is provided between a wall of the first septal standpipe and a wall of the second septal standpipe and between a wall of the second septal standpipe and a wall of the outer well.

3. The primary rain purification system of claim 2, wherein the interior of the first septal standpipe and the interior of the gap are filled with at least one primary rain purification material.

4. The incipient rain purification system of claim 3, wherein the water seepage holes comprise a first water seepage hole opened at the bottom end of the first intermediate vertical pipe, a second water seepage hole opened at the bottom end of the second intermediate vertical pipe, and a third water seepage hole opened at the bottom end of the outer well, and the number of the second water seepage holes is less than that of the first water seepage holes.

5. The primary rain purification system of claim 4, wherein a top of the first septal standpipe extends to a bottom of the detritus tank, and a top of the second septal standpipe is below the top of the first septal standpipe and a top of the outer well.

6. The primary rain purification system of any one of claims 1 to 5, wherein the outer well deployment depth is in the range of 4-10 meters.

7. The primary rain purification system of any one of claims 1 to 5, wherein a second screen is provided at the water passage hole, and the aperture of the second screen is smaller than the aperture of the first screen.

8. The primary rain purification system of any one of claims 1 to 5, wherein the depth of deployment of the detritus channel is in the range of 5-15 cm.

9. The primary rain purification system of any one of claims 1 to 5, wherein a water blocking fixture is provided at the bottom of the sediment tank for preventing primary rain in the sediment tank from directly entering the first septal standpipe.

10. The primary rain purification system of any one of claims 1 to 5, wherein the primary rain purification material is coated with a geotextile.