CN105417859A - Rainwater treatment device and method for rainwater and sewage running water pollution treatment - Google Patents

Abstract

The invention provides a rainwater treatment device for rainwater and sewage running water pollution treatment. The rainwater treatment device comprises a sediment well and a filter well connected with the sediment well. A water inlet is formed in the well wall of the sediment well and is externally connected with a rainwater inlet device through a water inlet pipe. The sediment well is communicated with the filter well through water distributing openings in the well wall, and a separation net is further arranged between the water inlet and the water distributing openings. A water distributing plate is arranged in the filter well, a filter material is arranged below the water distributing plate, a layer supporting plate is arranged at the bottom of the filter well, and an empty space layer is arranged below the layer supporting plate and provided with a water outlet. The rainwater treatment device is small in occupied area, flexible to build, simple in structure and capable of well purifying water according to the feature of rainwater and sewage running water pollution; a rainwater treatment method is high in filter speed and efficiency and remarkable in sewage purifying effect, the SS removal rate can reach around 85%, and the COD removal rate can reach around 60%.

Description

A rainwater treatment device and method for rainwater runoff pollution control

technical field

The invention relates to the technical field of rainwater runoff pollution treatment, in particular to a rainwater treatment device and method for treating rainwater runoff pollution.

Background technique

For a long time, people have believed that the main cause of water pollution is point source pollution (such as various industrial wastewater, aquaculture wastewater from large farms, urban concentrated domestic sewage, etc.), and did not realize that non-point source pollution (such as urban rainfall surface runoff, farmland wastewater, scattered rural domestic sewage, etc.), among which the rainwater runoff pollution caused by rainfall, especially the rainwater runoff pollution in the early stage of rainfall, poses a particularly serious threat to the water environment. The main pollution factors are garbage, SS ( suspended particulate matter) and COD (chemical oxygen demand). With the improvement of my country's urbanization level, the area of impermeable ground in cities and towns continues to increase. When rainfall occurs, not only the runoff will increase greatly, but also the runoff will carry a large amount of pollutants. These pollutants come from scattered large areas of land. , it is closely related to the natural conditions of the region and the rainfall process, so the formation of runoff pollution is more sudden, random, contingency and extensive, the pollution load varies greatly in time and space, and it is difficult to control and deal with it.

There are several problems in the existing treatment of stormwater runoff: (1) many cities and towns do not have perfect pipe network systems and sewage treatment plants, and stormwater runoff is directly discharged into natural water bodies without any treatment; (2) stormwater runoff It is a unique water quality with low BOD5 content, which is difficult to meet the ideal nutritional balance requirements of traditional water treatment processes. At the same time, due to the large changes in runoff flow and concentration, it also causes certain pressure on the normal operation of urban sewage treatment plants; (3 ) Most of the existing drainage pipe networks are still dominated by combined drainage pipe networks. If it is necessary to transform the diversion system, it will require huge funds, manpower and material resources, and it is difficult to realize; even after the diversion system, the rainwater may be directly discharged into natural water bodies , or perform unified collection and processing. In view of the characteristics of heavy pollution in the early stage of rainwater runoff and light pollution in the middle and late stages, the unified collection and treatment occupies a large area, the construction cost is expensive, and resources are wasted.

Contents of the invention

In order to solve the problems in the above-mentioned prior art, the object of the present invention is to provide a rainwater treatment device for rainwater runoff pollution control. After the rainwater is treated by the device, the rainwater can be directly discharged into the natural water body, effectively reducing rainwater pollution. Sewage runoff pollution.

To achieve the above object, the technical solution of the present invention is:

A rainwater treatment device for rainwater runoff pollution control, including a connected sedimentation well and a filter well, the well wall of the sedimentation well is provided with a water inlet, and the water inlet is externally connected to a rainwater inlet through a water inlet pipe; the well of the sedimentation well There is also a water distribution port on the wall. The sedimentation well communicates with the filter well through the water distribution port. The depth of the water distribution port is greater than that of the water inlet. Water plate, the depth of the water distribution plate is greater than the depth of the water distribution outlet, the filter material is arranged under the water distribution plate, and the bottom of the filter well is provided with a layer support plate for the layer support filter material, and the bottom of the layer support plate is an overhead layer. The overhead layer is provided with a water outlet, and the water outlet is connected to the drainage pipe network through the water outlet pipe; the entire rainwater treatment device is buried underground.

In the above-mentioned rainwater treatment device, the preferred structure of its sedimentation well and filter well has the following two types:

(1) The sedimentation well is a cuboid structure, and there are 2 filter wells, which are respectively arranged on both sides of the sedimentation well. Each filter well has the same structure. The first water distribution plate is set on the side of the filter well connected to the sedimentation well, the second water distribution plate is set on the other side of the filter well, and the water distribution hole diameter of the first water distribution plate is smaller than that of the second water distribution plate. The aperture of the water distribution hole of the plate; in the filter well, the filter material is an integrated structure.

An overflow pipe is provided in the overhead layer, the overflow pipe passes through the filter material, and the outlet of the overflow pipe is located in the space between the water distribution plate and the filter material, and an overflow port is provided on the second water distribution plate.

In the above structure, the aperture of the water distribution holes of the first water distribution plate is smaller than the aperture of the water distribution holes of the second water distribution plate. It is completely distributed, so as to ensure that the upper sewage is evenly distributed on the filter material.

The rainwater treatment device of this structure is buried deep underground, but occupies a small area.

(2) The sedimentation well is a cuboid structure, and there is one filter well, which is located on one side of the sedimentation well; On the other side of the filter well, there are the first filter layer, the second filter layer and the third filter layer in sequence, a first partition is arranged between the first filter layer and the second filter layer, and the first filter layer and the second filter layer The bottom is connected, and a second partition is set between the second filter layer and the third filter layer to completely separate them; the first filter layer and the third filter layer are respectively equipped with water distribution boards, and the top of the second partition is located The depth is greater than the depth of the water distribution plate of the first filter layer and smaller than the depth of the water distribution plate of the third filter layer.

The overhead layer is arranged below the third filter layer, and at least one overflow pipe is arranged in the overhead layer, and each overflow pipe passes through the third filter layer and its corresponding water distribution plate respectively, and the overflow port is arranged on the water distribution plate superior.

The rainwater treatment device of this structure has a relatively shallow buried depth in the ground, but occupies a large area.

In the above-mentioned rainwater treatment device for rainwater runoff pollution control, the water distribution board is a PVC board, and the water distribution board is uniformly arranged with water distribution holes, and the aperture of each water distribution hole is 4-10mm; the layer pallet It is a reinforced concrete prefabricated slab with a thickness of 50-80mm on the layer supporting plate. Water holes are evenly arranged on the layer supporting plate, and the diameter of each water hole is 12-20mm.

The well wall of the sedimentation well or filter well is one of brick wall structure, reinforced concrete prefabricated plate structure, PVC plate structure or metal plate structure; the filter material is one or the other of river sand, crushed stone or ceramsite Various.

When the rainwater treatment device of the present invention is in use, its rainwater purification principle is as follows: the rainwater runoff is collected on the surface by the rainwater inlet and intercepts large garbage, flows through the water inlet pipe, enters the sedimentation well, and first intercepts large pieces of garbage through the screen , and then carry out simple settlement. When the upper layer of sewage in the sedimentation well overflows to the water outlet, it enters the filter well through the water outlet. The water distribution plate intercepts medium-sized floating debris and at the same time distributes the sewage evenly in the filter material. The filter material is based on local convenience. The premise obtained is river sand + gravel or other combinations, and the sewage can be purified through the physical filtration of the filter material and the degradation of microorganisms in the filter material. Among them, when the filter well is the structure of the above-mentioned (1), the sewage is filtered from top to bottom; when the filter well is of the structure of the above-mentioned (2), the sewage is filtered through the tortuous function of the first partition and the second partition. Down and up and down. The filtrate obtained after sewage filtration and purification is discharged from the outlet pipe in the overhead layer, and the outlet pipe is connected according to the local drainage pipe network and then discharged into the natural water body. An overflow pipe is installed in the filter material. When the rain and sewage runoff flow is small or the early stage of the flow is large, all the sewage will be purified by the filter material. However, when the rain and sewage runoff flow is large in the middle and late stages, the sewage will enter the filter through the water distribution plate because it is too late. The material directly enters the overhead layer from the overflow pipe. At this time, the pollution degree of the sewage is very light, and it can be directly discharged into the natural water body without purification. The combination of the overhead layer and the overflow pipe can not only filter and ventilate the sewage smoothly, but also degrade and reoxygenate the microorganisms in the filter material, improve the degradation efficiency of the microorganisms, and reduce the clogging of the filter material.

In the rainwater treatment device of the present invention, the connection forms of the outlet pipe and the drainage pipe network mainly include the following types:

1. The outlet pipe can be connected to the drainage pipe of the imperfect pipe network and then discharged into the natural water body, or directly discharged into the natural water body. 2. The outlet pipe can be connected to the drainage pipes and manholes of the combined pipeline network and then discharged into natural water bodies, or connected to the drainage pipes and manholes of the combined pipeline network, when entering the local sewage treatment plant, it will pass through other pipelines without treatment Discharge into natural water bodies, which can reduce the load on the sewage treatment plant and not disturb the operation of the sewage treatment plant. 3. The outlet pipe can be connected to the rainwater drainage pipe network of the diversion system, and it can be directly discharged into the natural water body without further unified treatment, or the sewage in the early stage is unified and then further treated, and the sewage in the middle and late stages is directly discharged into the natural water body. Avoid the construction of large-scale rainwater unified treatment facilities, resulting in waste.

The present invention can realize a kind of rainwater treatment method that is used for rainwater runoff pollution treatment by above-mentioned device, comprises the following steps:

(1) After the rainwater inlet collects rainwater, the rainwater enters the sedimentation well through the water inlet pipe;

(2) After the rainwater enters the sedimentation well, the large pieces of garbage in the rainwater are first removed through the screen, and then the rainwater is gradually deposited at the bottom of the sedimentation well. The distribution outlet of the filter enters the filter well;

(3) After the upper layer of sewage enters the filter well, it is first distributed through the water distribution plate, and then physically filtered and microbially degraded by the filter material, and the obtained filtrate is sent from the outlet to the drainage pipe network through the outlet pipe.

When the filter material in the filter well has an integrated structure, the step (3) is specifically: after the upper layer of sewage enters the filter well, the water distribution plate removes the floating matter in the upper layer of sewage, and at the same time, the upper layer of sewage is evenly distributed into the filter material. The sewage is physically filtered and degraded by microorganisms through the filter material. The filtrate obtained after filtration enters the overhead layer and is sent from the outlet to the drainage pipe network through the outlet pipe.

Compared with the prior art, the beneficial effects of the present invention are:

(1) The rainwater treatment device of the present invention has a small footprint and flexible construction. The construction size can be determined according to the amount of rainwater runoff received. The cost is low, and it can be flexibly connected to the original pipe network. Runoff pollution is characterized to purify water.

(2) When adopting the rainwater treatment device and method thereof of the present invention to carry out rapid filtration treatment of sewage, the speed is fast and the efficiency is high; through the degradation of filter material and microorganisms, the sewage purification effect is obvious, and the SS removal rate can reach about 85% , The COD removal rate can reach about 60%.

(3) The rainwater treatment device of the present invention is easy to manage, as long as the sanitation workers regularly clean up the rainwater feeder, the rubbish on the net, etc. at ordinary times. If it is found that the filter material is clogged, the filtration is not smooth, and the rainwater has signs of overflowing during rain, just flip or replace the surface filter material;

Description of drawings

FIG. 1 is a schematic structural view of the rainwater treatment device of Embodiment 1.

Fig. 2 is a sectional view taken along line 1-1 of Fig. 1 .

Fig. 3 is a sectional view along line A-A of Fig. 1 .

Fig. 4 is a sectional view taken along line 2-2 of Fig. 2 .

Fig. 5 is a sectional view along line 3-3 of Fig. 2 .

Fig. 6 is a sectional view taken along line 4-4 of Fig. 2 .

Fig. 7 is a 5-5 sectional view of Fig. 2 .

FIG. 8 is a schematic structural view of the rainwater treatment device of Embodiment 3. FIG.

Fig. 9 is a sectional view taken along line 6-6 of Fig. 8 .

detailed description

The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments:

Example 1

In this embodiment, a rainwater treatment device for rainwater runoff pollution control, its structure is shown in Figures 1 to 7, including a connected sedimentation well 1 and a filter well 2, and the well wall of the sedimentation well 1 is provided with a water inlet 3. The water inlet 3 is externally connected to the rainwater inlet 5 through the water inlet pipe 4; the well wall of the sedimentation well 1 is also provided with a water distribution port 6, and the sedimentation well 1 communicates with the filter well 2 through the water distribution port 6, and the depth of the water distribution port 6 is Greater than the depth of the water inlet 3, there is also a screen 7 between the water inlet 3 and the water distribution port 6; the filter well 2 is provided with a water distribution plate 8, and the depth of the water distribution plate 8 is greater than that of the water distribution port 6. Depth, below the water distribution plate 8 is provided with a filter material 9, and the bottom of the filter well 2 is provided with a layer support plate 10 for the layer support filter material 9, below the layer support plate 10 is an overhead layer 11, and the overhead layer 11 is provided with a water outlet 12, The water outlet 12 is externally connected to the drainage pipe network through the water outlet pipe; the whole rainwater treatment device is buried underground.

In the rainwater treatment device of this embodiment, the sedimentation well 1 is a cuboid structure, and there are two filter wells 2, which are respectively arranged on both sides of the sedimentation well 1. Each filter well 2 has the same structure, and the water distribution plates 8 in each filter well 2 are respectively It is composed of the splicing of the first water distribution plate 13 and the second water distribution plate 14. The first water distribution plate 13 is set on the side where the filter well 2 connects with the sedimentation well 1, and the second water distribution plate 14 is set in the filter well 2. On the other side, the aperture of the water distribution hole of the first water distribution plate 13 is smaller than the aperture of the water distribution hole of the second water distribution plate 14; in the filter well, the filter material 9 has an integral structure.

As shown in Figure 2, an overflow pipe 15 is provided in the overhead layer 11, and the overflow pipe 15 passes through the filter material 9, and the outlet of the overflow pipe 15 is located in the space between the water distribution plate 8 and the filter material 9, and the second cloth An overflow port 16 is provided on the water plate 14 .

In the above structure, the aperture of the water distribution hole of the first water distribution plate 13 is smaller than the aperture of the water distribution hole of the second water distribution plate 14. It has been completely distributed in time, so as to ensure that the upper sewage is evenly distributed on the filter material.

The rainwater treatment device of this structure is deeply buried underground, but occupies a small area. The rainwater treatment device of this embodiment is 4m long, 1.7m wide, and 1.83m deep.

In this embodiment, the water distribution plate 8 is a PVC board, and the water distribution holes are uniformly arranged on the water distribution plate 8, and the diameter of each water distribution hole is 4-10mm. In this embodiment, the water distribution holes of the first water distribution plate 13 The hole diameter is 6mm, and the hole diameter of the water distribution holes of the second water distribution plate 14 is 8mm; The aperture of the water hole is 12-20 mm, the thickness of the middle supporting plate 10 in this embodiment is 60 mm, and the aperture of the water hole of the layer supporting plate 10 is 15 mm.

The wall of the sedimentation well 1 or the filter well 2 is one of brick wall structure, reinforced concrete prefabricated plate structure, PVC plate structure or metal plate structure; the filter material 9 is one or more of river sand, gravel or ceramsite Kind, in the present embodiment, filter material 9 comprises four-layer structure from top to bottom, namely: crushed stone (30～50mm in particle diameter, 100mm in thickness), crushed stone (15～30mm in particle diameter, 50mm in thickness), river sand (particle size 4-7mm, thickness 300mm), river sand (particle size 2-4mm, thickness 250mm).

When the rainwater treatment device of this embodiment is in use, its rainwater purification principle is: the rainwater runoff is collected on the surface by the rainwater inlet 5 and intercepts large garbage, flows through the water inlet pipe 4, enters the sedimentation well 1, and first passes through the screen 7 Intercept large pieces of garbage, and then carry out simple settlement. When the upper sewage in the sedimentation well 1 overflows to the water distribution port 6, it enters the filter well 2 through the water distribution port 6, and the water distribution plate 8 intercepts medium-sized floating objects and garbage, and at the same time, the sewage is evenly distributed. Distributed in the filter material 9, the sewage can purify water through the physical filtration of the filter material 9 and the degradation of microorganisms in the filter material 9. Among them, the sewage in the filter well 2 is filtered from top to bottom; the filtrate obtained after the sewage is filtered and purified is discharged from the outlet pipe in the overhead layer 11, and the outlet pipe is connected according to the local drainage pipe network and then discharged into the natural water body. An overflow pipe 15 is installed in the filter material 9. When the rainwater runoff flow rate is small or the initial stage of the flow rate is large, the sewage is all purified by the filter material 9, and the sewage in the middle and late stages when the rainwater runoff flow rate is large will be too late to pass through the water distribution system. The plate 8 enters the filter material 9 and directly enters the overhead layer 11 through the overflow pipe 15. At this time, the pollution degree of the sewage is very light, and it can be directly discharged into the natural water body without purification. The combination of the overhead layer 11 and the overflow pipe 15 can not only filter and ventilate the sewage smoothly, but also degrade and reoxygenate the microorganisms in the filter material 9, improve the degradation efficiency of the microorganisms, and reduce the clogging of the filter material 9.

In the above-mentioned rainwater treatment device, the connection forms of the outlet pipe and the drainage pipe network mainly include the following types: 1. The outlet pipe can be connected with the drainage pipe of the imperfect pipe network and then discharged into the natural water body, or directly discharged into the natural water body. 2. The outlet pipe can be connected to the drainage pipes and manholes of the combined pipeline network and then discharged into natural water bodies, or connected to the drainage pipes and manholes of the combined pipeline network, when entering the local sewage treatment plant, it will pass through other pipelines without treatment Discharge into natural water bodies, which can reduce the load on the sewage treatment plant and not disturb the operation of the sewage treatment plant. 3. The outlet pipe can be connected to the rainwater drainage pipe network of the diversion system, and it can be directly discharged into the natural water body without further unified treatment, or the sewage in the early stage is unified and then further treated, and the sewage in the middle and late stages is directly discharged into the natural water body. Avoid the construction of large-scale rainwater unified treatment facilities, resulting in waste.

The rainwater treatment method for rainwater runoff pollution control realized by the above-mentioned device in this embodiment includes the following steps:

(1) After the rainwater feeder 5 collects rainwater, the rainwater enters the sedimentation well 1 through the water inlet pipe 4;

(2) After the rainwater enters the sedimentation well 1, the large pieces of garbage in the rainwater are first removed through the screen 7, and then the rainwater is gradually deposited at the bottom of the sedimentation well 1, and the sludge in the rainwater is deposited at the bottom of the sedimentation well 1, and the upper layer Sewage enters the filter well 2 from the water distribution port 6 on the well wall;

(3) After the upper layer of sewage enters the filter well 2, the water distribution plate 8 removes the floating matter in the upper layer of sewage, and at the same time the upper layer of sewage is evenly distributed in the filter material 9, and the upper layer of sewage is physically filtered and microbially degraded through the filter material 9. The obtained filtrate enters the overhead layer 11 and is sent to the drainage pipe network from the water outlet 12 through the outlet pipe.

When the rainwater treatment device and treatment method of this embodiment are used for rainwater filtration, the parameters of the water samples taken are: rainwater runoff flow rate 9L/m2.s, SS 919mg/L, COD 158.35mg/L. The filtrate obtained after the treatment was measured by the national standard water quality testing method, and the result was that the removal rate of SS was 91%, and the removal rate of COD was 51%.

Example 2

This embodiment is a rainwater treatment device for rainwater runoff pollution control, its structure is the same as that of the first embodiment, and the rainwater treatment method implemented by this device is also the same as that of the first embodiment. The difference is that when the rainwater treatment device and treatment method of the present embodiment are used for rainwater filtration, the filter material 9 in the filter well 2 comprises a four-layer structure from top to bottom, namely: crushed stone (30-50 mm in diameter) , thickness 100mm), gravel (particle size 15-30mm, thickness 50mm), ceramsite (particle size 3-6mm, thickness 300mm), river sand (particle size 2-4mm, thickness 250mm).

The parameters of the water samples taken are: the rainwater runoff flow rate is 9L/m2.s, the influent SS is 843mg/L, and the COD is 191.9mg/L. The filtrate obtained after the treatment was measured by the national standard water quality test method, and the result was that the removal rate of SS was 65%, and the removal rate of COD was 66%.

Example 3

This embodiment is a kind of rainwater treatment device used for rainwater runoff pollution control, its structure is shown in Figure 8 ~ 9, including the sedimentation well 1 and filter well 2 connected, the well wall of the sedimentation well 1 is provided with a water inlet 3. The water inlet 3 is externally connected to the rainwater inlet 5 through the water inlet pipe 4; the well wall of the sedimentation well 1 is also provided with a water distribution port 6, and the sedimentation well 1 communicates with the filter well 2 through the water distribution port 6, and the depth of the water distribution port 6 is Greater than the depth of the water inlet 3, there is also a screen 7 between the water inlet 3 and the water distribution port 6; the filter well 2 is provided with a water distribution plate 8, and the depth of the water distribution plate 8 is greater than that of the water distribution port 6. Depth, below the water distribution plate 8 is provided with a filter material 9, and the bottom of the filter well 2 is provided with a layer support plate 10 for the layer support filter material 9, below the layer support plate 10 is an overhead layer 11, and the overhead layer 11 is provided with a water outlet 12, The water outlet 12 is externally connected to the drainage pipe network through the water outlet pipe; the whole rainwater treatment device is buried underground.

In the rainwater treatment device of the present embodiment, the settling well 1 is a cuboid structure, and there is one filter well 2, which is located on one side of the settling well 1; in the filter well 2, the filter material 9 is a three-layer structure arranged side by side, from and From one side of the filter well 2 connected to the sedimentation well 1 to the other side of the filter well 2, there are successively the first filter layer 17, the second filter layer 18 and the third filter layer 19, as shown in Figure 9, the first filter layer 17 There is a first partition 20 between the second filter layer 18, the first filter layer 17 communicates with the bottom of the second filter layer 18, and the second filter layer 18 and the third filter layer 19 are provided to completely separate it. The second partition 21 of the first filter layer 17 and the third filter layer 19 are respectively provided with a water distribution plate 8, and the depth of the top of the second partition 21 is greater than the depth of the water distribution plate of the first filter layer 17, and Less than the depth of the water distribution plate of the third filter layer 19.

The overhead layer 11 is arranged below the third filter layer 19, and two overflow pipes 15 are arranged in the overhead layer 11, and each overflow pipe 15 passes through the third filter layer 19 and its corresponding water distribution plate 8 respectively, and the overflow port 16 is located on the water distribution plate 8.

The rainwater treatment device of this structure has a relatively shallow buried depth in the ground, but occupies a large area. The rainwater treatment device of this embodiment is 1.85m long, 3m wide and 1.1m deep.

The water distribution plate 8 is a PVC board, and the water distribution holes are evenly arranged on the water distribution plate 8. The aperture of each water distribution hole is 4-10 mm. In this embodiment, the water distribution hole diameter of the water distribution plate 8 is 8 mm; 10 is a reinforced concrete prefabricated slab, the thickness of the layer supporting plate is 50-80 mm, and the layer supporting plate 10 is uniformly arranged with water holes, the aperture of each water hole is 12-20 mm, and the thickness of the middle layer supporting plate 10 in this embodiment is 60 mm , The hole diameter of the water hole of the layer pallet 10 is 15mm.

The wall of the sedimentation well 1 or the filter well 2 is one of brick wall structure, reinforced concrete prefabricated plate structure, PVC plate structure or metal plate structure; the filter material 9 is one or more of river sand, gravel or ceramsite Kind, in the present embodiment, the first filter layer 17 adopts river sand (2～4mm in particle diameter, thick 200mm), and the first filter layer 18 adopts river sand (2～4mm in particle diameter, thick 200mm), and the third filter layer 19 It includes a two-layer structure from top to bottom, namely: river sand (particle size 4-7mm, thickness 50mm), gravel (particle size 15-40mm, thickness 150mm).

When the rainwater treatment device of this embodiment is in use, its rainwater purification principle is: the rainwater runoff is collected on the surface by the rainwater inlet 5 and intercepts large garbage, flows through the water inlet pipe 4, enters the sedimentation well 1, and first passes through the screen 7 Intercept large pieces of garbage, and then carry out simple settlement. When the upper sewage in the sedimentation well 1 overflows to the water distribution port 6, it enters the filter well 2 through the water distribution port 6, and the water distribution plate 8 intercepts medium-sized floating objects and garbage, and at the same time, the sewage is evenly distributed. Distributed in the filter material 9, the sewage is filtered through the first partition 20 and the second partition 21 in a zigzag manner, first downwards, then upwards, and then downwards. The filtrate obtained after sewage filtration and purification is discharged from the outlet pipe in the overhead layer 11, and the outlet pipe is connected according to the local drainage pipe network and then discharged into the natural water body. An overflow pipe 15 is installed in the filter material 9. When the rain and sewage runoff flow is small or the initial stage of the flow is large, all the sewage is purified through the filter material, and the middle and late sewage when the rain and sewage runoff flow is large will not pass through the water distribution plate in time. Enter the filter material and directly enter the overhead layer from the overflow pipe. At this time, the pollution degree of the sewage is very light, and it can be directly discharged into the natural water body without purification. The combination of the overhead layer 11 and the overflow pipe 15 can not only filter and ventilate the sewage smoothly, but also degrade and reoxygenate the microorganisms in the filter material, improve the degradation efficiency of the microorganisms, and reduce the clogging of the filter material.

In this embodiment, the connection forms of the outlet pipe and the drainage pipe network mainly include the following types: 1. The outlet pipe can be connected to the drainage pipe of the imperfect pipe network and then discharged into the natural water body, or directly discharged into the natural water body. 2. The outlet pipe can be connected to the drainage pipes and manholes of the combined pipeline network and then discharged into natural water bodies, or connected to the drainage pipes and manholes of the combined pipeline network, when entering the local sewage treatment plant, it will pass through other pipelines without treatment Discharge into natural water bodies, which can reduce the load on the sewage treatment plant and not disturb the operation of the sewage treatment plant. 3. The outlet pipe can be connected to the rainwater drainage pipe network of the diversion system, and it can be directly discharged into the natural water body without further unified treatment, or the sewage in the early stage is unified and then further treated, and the sewage in the middle and late stages is directly discharged into the natural water body. Avoid the construction of large-scale rainwater unified treatment facilities, resulting in waste.

In this embodiment, a rainwater treatment method for rainwater runoff pollution control realized by the above-mentioned device comprises the following steps:

(1) After the rainwater feeder 5 collects rainwater, the rainwater enters the sedimentation well 1 through the water inlet pipe 4;

(2) After the rainwater enters the sedimentation well 1, the large pieces of garbage in the rainwater are first removed through the screen 7, and then the rainwater is gradually deposited at the bottom of the sedimentation well 1, and the sludge in the rainwater is deposited at the bottom of the sedimentation well 1, and the upper layer Sewage enters the filter well 2 from the water distribution port 6 on the well wall;

(3) After the upper layer of sewage enters the filter well 2, the water distribution plate 8 above the first filter layer 17 removes the floating matter in the upper layer of sewage, and at the same time, the upper layer of sewage is evenly distributed to the first filter layer 17, and the upper layer of sewage passes through the first filter. After the primary filtration of the layer 17, it enters the second filter layer 18 from the channel below the first partition 20, and performs secondary filtration in the second filter layer 18, and then the water distribution plate 8 above the third filter layer 19 evenly Distributed in the third filter layer 19, the third filter layer 19 performs three-stage filtration, and the filtrate obtained after filtration enters the overhead layer 11 below the third filter layer 19, and is sent to the drainage pipe network from the water outlet 12 through the outlet pipe.

When the rainwater treatment device and treatment method of this embodiment are used for rainwater filtration, the parameters of the water samples taken are: rainwater runoff flow rate 9L/m ² .s, SS 574mg/L, COD 172.49mg/L. The filtrate obtained after the treatment was measured by the national standard water quality testing method, and the result was that the removal rate of SS was 83%, and the removal rate of COD was 43%.

The above is only a specific implementation of the present invention, but the scope of protection of the present invention is not limited thereto, and any changes or replacements that do not come to mind through creative work shall be covered within the scope of protection of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope defined in the claims.

Claims (7)

1. The rainwater treatment device for rainwater runoff pollution control is characterized in that it includes a connected sedimentation well and a filter well, and the well wall of the sedimentation well is provided with a water inlet, and the water inlet is externally connected to a rainwater inlet through a water inlet pipe; The well wall of the sedimentation well is also provided with a water outlet, through which the sedimentation well communicates with the filter well. There is a water distribution board inside, and the depth of the water distribution board is greater than the depth of the water distribution outlet. There is a filter material under the water distribution board, and a layer support plate for the filter material is provided at the bottom of the filter well. It is an overhead layer, and the overhead layer is provided with a water outlet, and the water outlet is connected to the drainage pipe network through the outlet pipe; the entire rainwater treatment device is buried underground. 2. The rainwater treatment device for rainwater runoff pollution control according to claim 1, characterized in that, the settling well is a cuboid structure, and there are 2 filter wells, which are respectively located on both sides of the settling well, each filter well structure Similarly, the water distribution boards in each filter well are respectively composed of the first water distribution board and the second water distribution board. On the other side of the filter well, the aperture of the water distribution holes of the first water distribution plate is smaller than the aperture of the water distribution holes of the second water distribution plate; in the filter well, the filter material has an integrated structure. 3. according to claim 1 or 2 described rainwater treatment device for rainwater runoff pollution control, it is characterized in that, overflow pipe is provided in described overhead layer, overflow pipe passes filter material, and the outlet of overflow pipe Located in the space between the water distribution plate and the filter material, the second water distribution plate is provided with an overflow port. 4. The rainwater treatment device for rainwater runoff pollution control according to claim 1, characterized in that, the settling well is a cuboid structure, and there is one filter well, which is located on one side of the settling well; in the filter well, the filter The material is a three-layer structure arranged side by side. From one side of the filter well connected with the sedimentation well to the other side of the filter well, there are in turn the first filter layer, the second filter layer and the third filter layer. A first partition is provided between the two filter layers, the first filter layer communicates with the bottom of the second filter layer, and a second partition that completely separates the second filter layer and the third filter layer is provided between the first filter layer and the third filter layer; Water distribution plates are respectively arranged on the filter layer and the third filter layer, and the depth of the top of the second partition is greater than the depth of the water distribution plate of the first filter layer and smaller than the depth of the water distribution plate of the third filter layer. 5. according to claim 1 or 4 described rainwater treatment device for rainwater runoff pollution control, it is characterized in that, described overhead layer is arranged below the third filter layer, is provided with at least one overflow pipe in the overhead layer, each The overflow pipe respectively passes through the third filter layer and its corresponding water distribution plate, and the overflow port is arranged on the water distribution plate. 6. The rainwater treatment device for rainwater runoff pollution control according to claim 1, wherein the water distribution plate is a PVC plate, the water distribution plate is evenly arranged with water distribution holes, and the aperture of each water distribution hole 4-10mm; the layer pallet is a reinforced concrete upper prefabricated board, the thickness of the layer pallet is 50-80mm, and the layer pallet is evenly arranged with water holes, and the diameter of each water hole is 12-20mm. 7. The rainwater treatment device for rainwater runoff pollution control according to claim 1, characterized in that, the well wall of the sedimentation well or filter well is a brick wall structure, a reinforced concrete prefabricated board structure, a PVC board structure or a metal One of the plate structures; the filter material is one or more of river sand, gravel or ceramsite.