CN112814120A

CN112814120A - Construction method of primary rain purification system

Info

Publication number: CN112814120A
Application number: CN202110004887.1A
Authority: CN
Inventors: 易升泽; 于忠金; 俞静雯
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: 2021-05-18
Anticipated expiration: 2041-01-04
Also published as: CN112814120B

Abstract

The invention relates to the technical field of urban non-point source pollution treatment, and provides a construction method of a primary rain purification system, wherein existing open drainage ditches/cover plate ditches on two banks of an urban river or newly-built open drainage ditches/cover plate ditches at proper positions are utilized, and a sediment well and a primary rain purification well which are mutually communicated are arranged at the bottom of the ditches, so that the problems that primary rain purification facilities such as a primary rain storage pond, 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 primary rain purification well is communicated with the underground relatively permeable stratum, so that the drainage speed of surface runoff in rain is effectively accelerated, the purification capacity of the coarse sand stratum in the two banks of the river, which is a natural resource, on water quality is fully utilized, the construction cost of the project is greatly reduced, and the possibility is provided for large-scale popularization.

Description

Construction method of primary rain purification system

Technical Field

The invention relates to the technical field of urban non-point source pollution treatment, in particular to a construction method of 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 construction 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 technical problem, the construction method of the primary rain purification system provided by the invention comprises the following steps:

arranging a sediment well at the bottom of the existing open drainage ditch or cover plate ditch, and installing a first filter screen at the top of the sediment well;

arranging a primary rain purification well at the bottom of the existing drainage open ditch or cover plate ditch and at one side of the sediment well, and arranging a plurality of first seepage holes communicated with the stratum on the lower well wall of the primary rain purification well;

installing a primary rain purification pipe inside the primary rain purification well, wherein a plurality of second water seepage holes are formed in the pipe wall of the lower part of the primary rain purification pipe; the interior of the primary rain purification pipe is filled with at least one primary rain purification material;

an overflow pipe is arranged between the sediment well and the primary rain purification pipe;

and sealing the primary rain purification well by using a sealing well cover.

Further, laying a sediment well at the bottom of the existing open drain or cover plate ditch, and installing a first filter screen at the top of the sediment well further comprises:

and a sediment barrel is arranged in the sediment well, wherein a third water seepage hole is formed in the bottom wall of the sediment barrel, and the bottom wall of the sediment barrel is wrapped by geotextile.

and a second filter screen is arranged at the bottom of the sediment well, wherein the pore diameter of the second filter screen is smaller than that of the first filter screen, and the second filter screen wraps the geotextile.

Further, still include after the inside sediment bucket of installation of sediment well:

and a first water plugging rubber ring is arranged between the well wall of the sediment well and the barrel wall of the sediment barrel.

Further, the depth range of the arrangement of the primary rain purification well is determined according to the burial depth of the medium-coarse sand stratum.

Further, the installation of an overflow pipe between the sediment well and the primary rain purification pipe further comprises:

and the pipe openings at the two ends of the overflow pipe are respectively provided with a third filter screen, and the third filter screen wraps the geotextile.

Further, the installation of first rain purifying pipe in the inside of first rain purifying well still includes:

and a second water plugging rubber ring is arranged between the pipe wall of the primary rain purification pipe and the well wall of the primary rain purification well.

Further, the primary rain purification material is wrapped by geotextile.

Further, the construction method further comprises the following steps:

and arranging drainage blind pipes at the positions close to the top in the downstream of the primary rain purification well and the middle coarse sand stratum layer, wherein the drainage blind pipes wrap the geotextile.

Compared with the prior art, the construction method of the initial rain purification system has the following beneficial effects:

the existing open drainage ditches/cover plate ditches on two banks of the urban river or newly-built open drainage ditches/cover plate ditches at proper positions are utilized, and the mutually communicated sediment well and the primary rain purification well are arranged at the bottom of the ditches, so that the problems that primary rain purification facilities such as a primary rain storage pond and an intelligent drainage well are large in land and difficult to implement are solved, and meanwhile, the construction cost is greatly reduced; the primary rain purification well is communicated with the underground relatively permeable stratum, so that the drainage speed of surface runoff in rain is effectively accelerated, the purification capacity of the coarse sand stratum in the two banks of the river, which is a natural resource, on water quality is fully utilized, the construction cost of the project is greatly reduced, and the possibility is provided for large-scale popularization.

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 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 sediment trap of FIG. 2;

FIG. 4 is a top view of the sediment trap structure of FIG. 3;

FIG. 5 is a top view of the primary rain purification well structure of FIG. 2;

FIG. 6 is a schematic view of the primary rain purification tube of FIG. 5;

figure 7 is a schematic view of the structure of an overflow tube in one embodiment.

Description of reference numerals:

1. a drainage open ditch or a cover plate ditch; 2. a sediment well; 21. a first filter screen; 22. a slag settling barrel; 23. a second filter screen; 24. a first water plugging rubber ring; 3. a primary rain purification well; 31. sealing the well cover; 32. a primary rain purification pipe; 321. a second water seepage hole; 33. a primary rain purification material; 34. a first water seepage hole; 35. a second water plugging rubber ring; 4. an overflow pipe; 41. a third filter screen; 5. a first earth formation; 6. a second earth formation; 7. a third earth formation; 8. and (4) a drainage blind pipe.

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.

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, in this embodiment, the construction method of the initial rain purification system includes the following steps:

step S101, arranging a sediment well 2 at the bottom of the existing open drain or cover plate ditch 1, and installing a first filter screen 21 at the top of the sediment well 2.

Preferably, in the embodiment, the sediment well 2 is made of a PVC pipe and buried 1 m deep; the opening part at the top of the sediment well 2 is provided with a first filter screen 21, the first filter screen 21 seals the well mouth of the sediment well 2 and is used for filtering large impurity garbage in the primary rain, and preferably, the first filter screen 21 is a stainless steel piece.

And S102, arranging a primary rain purification well 3 at the bottom of the existing drainage open ditch or cover plate ditch 1 and at one side of the sediment well 2, and arranging a plurality of first water seepage holes 34 communicated with the stratum on the lower well wall of the primary rain purification well 3.

Specifically, in this embodiment, the sediment well 2 and the first rain purification well 3 are adjacently disposed at the bottom of the open drain or the cover ditch 1, and optionally, the first rain purification well 3 is made of a steel pipe (sprayed with an anti-rust layer). The existing open drainage ditches/cover plate ditches on two banks of the urban river or newly-built open drainage ditches/cover plate ditches at proper positions are utilized, and the mutually adjacent sediment wells 2 and the primary rain purification wells 3 are arranged at the bottoms of the ditches, so that the problems that primary rain purification facilities such as a primary rain regulation pool and an intelligent drainage well are large in land and difficult to implement are solved, and meanwhile, the engineering cost is greatly reduced.

Specifically, in the present embodiment, 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 the differences of the permeability coefficients of the formations, where K1, K2 < K3. Preferably, the sediment well 2 is buried in the first stratum 5, and the first rain purification well 3 is buried in the third stratum 7 from the first stratum 5 and the second stratum 6. 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.

Step S103, installing an initial rain purification pipe 32 in the initial rain purification well 3, wherein a plurality of second water seepage holes 321 are formed in the lower pipe wall of the initial rain purification pipe 32; the interior of the primary rain purification pipe 32 is filled with at least one primary rain purification material 33;

specifically, in this embodiment, the first rain purification well 3 is coaxially provided with a first rain purification pipe 32 inside, the first rain purification pipe 32 is filled with at least one first rain purification material 33, and the bottom end of the first rain purification pipe 32 is provided with a second water seepage hole 321 for discharging purified first rain.

Specifically, in this embodiment, the primary rain purification pipe 32 is a PVC pipe, the primary rain purification material 33 filled in the primary rain purification pipe 32 may be one type, or may be alternatively filled with a plurality of purification materials, and the primary rain purification material 33 may be an active adsorption material or a microorganism carrier material, such as zeolite and an active carbon material which are alternatively filled, or may be an individual zeolite material or an individual active carbon material, and different purification materials may be selectively filled according to actual needs, so as to achieve the optimal purification effect on the primary rain. The specific type and filling manner of the primary rain purification material 33 are not particularly limited.

Specifically, as shown in fig. 2 and fig. 6, the first water seepage holes 34 on the primary rain purification well 3 and the second water seepage holes 321 opened at the bottom end of the primary rain purification pipe 32 enable the primary rain purification well 3 to be communicated with the third stratum 7, i.e., the medium-coarse sand stratum, the opening ranges of the first water seepage holes 34 and the second water seepage holes 321 on the primary rain purification well 3 and the primary rain purification pipe 32 are matched with the buried depth range of the relatively permeable stratum (the medium-coarse sand stratum), the first water seepage holes 34 can be opened on the well wall and the well bottom of the primary rain purification well 3, the second water seepage holes 321 can be opened on the pipe wall and the pipe bottom of the primary rain purification pipe 32, and the diameter ranges of the first water seepage holes 34 and the second water seepage holes 321 can be selected to be 4-10 mm.

Step S104, installing an overflow pipe 4 between the sediment well 2 and the primary rain purification pipe 32;

and step S105, covering the primary rain purification well 3 by using the sealing well cover 31.

Specifically, the overflow pipe 4 is used to communicate the sediment well 2 with the primary rain purification pipe 32. The top opening part of the first rain purification well 3 is provided with a sealing well cover 31, and rainwater cannot flow into the first rain purification well 3 from the sealing well cover 31.

The primary rain purification system of the embodiment is communicated with the underground relatively permeable stratum through the primary rain purification well 3, so that the drainage speed of surface runoff in rain is effectively accelerated, natural resources, namely the purification capacity of coarse sand strata in two banks of a river channel to water quality, are fully utilized, the construction cost of engineering is greatly reduced, and the possibility is provided for large-scale popularization of the primary rain purification system.

Further, step S101 further includes:

the sediment barrel 22 is arranged inside the sediment well 2, wherein the third water seepage hole is arranged on the barrel bottom wall of the sediment barrel 22, and the geotechnical cloth is wrapped on the barrel bottom wall of the sediment barrel 22.

Specifically, in the present embodiment, the slag trap 22 is used to filter coarse impurities. The sediment tank 22 can be made of plastic, and of course, the sediment tank 22 can be made of other materials, and the specific material of the sediment tank 22 is not limited herein. The bottom of the slag settling barrel 22 is provided with third water seepage holes (not shown in the figure), preferably water seepage holes with uniform intervals, and the diameter range of the third water seepage holes can be selected to be 1-2 mm. Sediment bucket 22 and sediment well 2 are preferred coaxial setting, set up sediment bucket 22 mainly used for filtering deposit thicker impurity, can regularly take out sediment bucket 22 from sediment well 2 and clear up convenient and fast. The depth of the slag settling tank 22 preferably corresponds to the height of the overflow pipe 4. Sediment bucket 22 set up on the one hand and realized the sediment filtration to coarse grain impurity, be convenient for carry out periodic cleaning to sediment well 2, on the other hand can slow down the speed that rain purification material 33 was blockked up by the particulate matter that rain carried in the rain purification pipe 32 just for the first time to ensure purifying effect.

Preferably, in order to avoid partial coarse-grained impurity from flowing out from the third infiltration hole, directly enter into first stratum 5 after oozing through the infiltration hole on the sediment well, the third infiltration hole of sediment bucket 22 bottom is wrapped up with geotechnological cloth to ensure that most first rain enters into first rain purification well 3 through overflow pipe 4 in sediment well 2, ensure the purifying effect of first rain.

Further, step S101 further includes:

and a second filter screen 23 is arranged at the bottom of the sediment well 2, wherein the aperture of the second filter screen 23 is smaller than that of the first filter screen 21, and the second filter screen 23 wraps the geotextile.

Specifically, the second filter screen 23 may be made of stainless steel as the first filter screen 21, and the second filter screen 23 is disposed at the bottom of the sediment well 2 for bottom sealing. The second filter screen 23 sets up the main effect and is behind the rain for ponding in the sediment well 2 can slowly discharge or evaporate, and the aperture of second filter screen 23 is less than the aperture of first filter screen 21 can make the drainage ability of second filter screen 23 be less than first filter screen 21, thereby the granule pollutant that reduces as far as possible and get into the stratum.

Preferably, the second filter screen 23 is also coated with geotextile, and the main function of the second filter screen 23 coated with geotextile is that when the sediment barrel 22 is cleaned after rain, the sediment does not fall when the sediment barrel 22 is lifted out, and meanwhile, the influence of impurities in the stratum 5 on the sediment effect caused by the fact that the impurities enter the sediment barrel 22 along with underground water is avoided.

Further, still include after the sediment bucket 22 is installed to sediment well 2 inside:

a first water plugging rubber ring 24 is arranged between the wall of the sediment well 2 and the wall of the sediment barrel 22.

Because there is the gap between the wall of a well of sediment well 2 and the bucket wall of sediment bucket 22, in order to prevent that the first rain that gets into sediment well 2 directly gets into first stratum 5 from the gap between the wall of a well of sediment well 2 and the bucket wall of sediment bucket 22, can't realize filtering and precipitating, or the coarse grain impurity in the first rain gets into the gap and blocks up the second filter screen 23 of sediment well 2 bottom, set up first water shutoff rubber circle 24 between the wall of a well of sediment well 2 and the bucket wall of sediment bucket 22 and be used for the shutoff above-mentioned gap.

Further, the depth range of the arrangement of the primary rain purification well 3 depends on the burial depth of the medium-coarse sand stratum.

The burial depth range of the primary rain purification well 3 depends on the burial depth of the medium-coarse sand stratum. Since the medium-coarse sand formation is found in the range of the burial depth of 10m by surveying the geological survey data or by geological drilling, in order to make better use of the drainage capacity of the natural medium-coarse sand formation, the initial rain purification well 3 is preferably arranged in the range of 4-10m in depth. Of course, the depth range of the initial rain purification well 3 may be other depth ranges according to specific geographical characteristics.

Further, step S104 further includes:

and the pipe openings at the two ends of the overflow pipe 4 are respectively provided with a third filter screen 41, and the third filter screen 41 wraps the geotextile.

Specifically, in order to reduce the coarse-grained impurity and enter into first rain purification well 3, slow down the speed that first rain purification material 33 was blockked up by the particulate matter that first rain carried in first rain purification pipe 32, ensure purifying effect, set up third filter screen 41 in the mouth of pipe department at the both ends of overflow pipe 4, third filter screen 41 is the optional stainless steel material.

Preferably, to further reduce the entry of coarse impurities into the primary rain purification well 3, the third screen 41 is also covered with geotextile. After the primary rain is filtered by the geotextile at the opening of the overflow pipe 4 and the third filter screen 41, the primary rain overflows into the primary rain purification well 3 for further purification treatment.

Further, step S103 further includes:

and a second water plugging rubber ring 35 is arranged between the pipe wall of the primary rain purification pipe 32 and the well wall of the primary rain purification well 3.

Specifically, because there is the gap between the wall of a well of first rain purification well 3 and the pipe wall of first rain purification pipe 32, in order to prevent that the water that overflows to in first rain purification well 3 can not directly flow to the medium-coarse sand stratum from the gap between the wall of a well of first rain purification well 3 and the pipe wall of first rain purification pipe 32, set up second water shutoff rubber circle 35 between the wall of a well of first rain purification well 3 and the pipe wall of first rain purification pipe 32 and be used for shutoff above-mentioned gap.

Further, the primary rain purification material 33 is wrapped with geotextile.

In order to prevent the particles of the first rain purification material 33 from flowing and blocking the second water seepage holes 321 under the washing of the first rain, the first rain purification material 33 is wrapped by geotextile, and if a plurality of first rain purification materials 33 are alternately filled in sections, each first rain purification material 33 is wrapped by geotextile. The geotextile can play a certain role in filtering and purifying while fixing the particles of the initial rain purification material 33.

Further, the construction method of the initial rain purification system further comprises the following steps:

and a drainage blind pipe 8 is arranged at the position close to the top in the middle coarse sand stratum layer at the downstream of the primary rain purification well 3, and the drainage blind pipe 8 wraps the geotextile.

Specifically, when the permeability coefficient of the medium coarse sand layer is low, the drainage blind pipe 8 can be arranged for accelerating the flow rate of the groundwater in the medium coarse sand layer, and the drainage blind pipe 8 is usually laid at the position at the downstream of the primary rain purification well 3 and near the top in the medium coarse sand layer for accelerating the flow rate of the groundwater in the medium coarse sand layer, so that the influence on the service performance due to too long storage time of the primary rain in the primary rain purification well 3 is avoided; if the formation permeability coefficient is more than 0.024cm/s, the drainage blind pipe 8 is not laid generally. The drainage blind pipe 8 is used as an auxiliary drainage facility, and is used for assisting in draining water of a permeable stratum when the permeability coefficient of the target permeable stratum is relatively low and draining the water to a river channel, so that the mobility of water in the primary rain purification well 3 is accelerated, and the drainage blind pipe 8 can be arranged at any position of the target permeable stratum, which can be communicated with the river channel. Preferably, the drainage blind pipe 8 is also wrapped by geotextile.

The construction method of the initial rain purification system utilizes the existing open drainage ditches/cover plate ditches at two banks of the urban river or newly builds the open drainage ditches/cover plate ditches at proper positions, and arranges the mutually communicated sediment wells and the initial rain purification wells at the bottoms of the ditches, thereby solving the problems of large land and difficult implementation of initial rain purification facilities such as an initial rain regulation pool, an intelligent drainage well and the like, and simultaneously greatly reducing the construction cost; the primary rain purification well is communicated with the underground relatively permeable stratum, so that the drainage speed of surface runoff in rain is effectively accelerated, natural resources, namely the drainage capability of coarse sand stratum in two banks of a river and the purification capability of water quality are fully utilized, the construction cost of engineering is greatly reduced, and the possibility is provided for large-scale popularization.

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 construction method of an initial rain purification system is characterized by comprising the following steps:

and sealing the primary rain purification well by using a sealing well cover.

2. The construction method of the primary rain purification system according to claim 1, wherein the step of arranging a sediment well at the bottom of the existing open drain or cover ditch, and the step of installing a first filter screen at the top of the sediment well further comprises the steps of:

3. The construction method of the primary rain purification system according to claim 2, wherein the step of arranging a sediment well at the bottom of the existing open drain or cover ditch, and the step of installing a first filter screen at the top of the sediment well further comprises the steps of:

4. The construction method of the primary rain purification system according to claim 3, wherein the step of installing a sediment tank inside the sediment well further comprises:

5. The method of claim 1, wherein the depth of the primary rain purification well is determined according to the burial depth of the medium-coarse sand formation.

6. The method of claim 3, wherein installing an overflow pipe between the sediment trap and the primary rain purification pipe further comprises:

7. The method of claim 1, wherein installing a primary rain purification pipe inside the primary rain purification well further comprises:

8. The method of claim 1, wherein the primary rain purification material is wrapped with geotextile.

9. The method of constructing an initial rain purification system according to any one of claims 1 to 8, further comprising the steps of: