Linear rainwater gutter coupled with bioretention function

Abstract

The invention discloses a linear rainwater gutter coupled with a bioretention function, which comprises a rainwater gutter, a partition plate is arranged in the rainwater gutter, and the partition plate divides the rainwater gutter into a first channel and a second channel; an opening is formed in the upper portion of the first channel and used for allowing rainwater to enter, a baffle is arranged above the second channel to seal the second channel, and the second channel communicates with a drainage pipe. At least part of the partition plate is provided with a filter screen, the first channel is communicated with the second channel at the filter screen, and the second channel is filled with bioretention filler. The device is small in occupied area, and can be arranged in different areas, so that the device can be applied to different scenes. Moreover, impurities such as suspended solids in the rainwater are removed by arranging a filter screen, then the rainwater subjected to primary treatment by the filter screen enters the second channel, and the rainwater is treated by the bioretention filler in the second channel so as to remove soluble pollutants or pollutants with smaller particle sizes. In this way, pollutants in the rainwater are fully and effectively treated in a two-time filtering mode.

Description

Technical Field

[0001] The present invention relates to the technical field of controlling rainwater runoff pollution in cities, and in particular to a linear rainwater ditch coupled with a bioretention function. Background Art

[0002] Currently, the main control technologies for rainwater runoff pollution in cities include: pretreatment technology, that is, source control, such as green roofs and permeable pavement; process control technology, that is, interception of the transmission process, such as vegetation buffer zones and ecological grass ditches; end-of-pipe treatment technology, that is, final centralized treatment, such as artificial wetlands, sedimentation tanks and filtration systems.

[0003] Stormwater inlets are a crucial component of urban drainage systems and serve as the gateway for surface rainwater to enter underground pipe networks or ecological facilities. Currently, conventional stormwater inlets primarily consist of grate grates and linear gutters. While these inlets are designed to quickly drain surface water, they often lack or poorly address stormwater pollution. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a linear stormwater ditch coupled with a bioretention function, which can effectively control stormwater runoff pollution.

[0005] The object of the present invention is achieved through the following technical solutions: A linear rainwater ditch coupled with a bioretention function comprises a rainwater ditch with a partition provided therein, the partition dividing the rainwater ditch into a first channel and a second channel; an opening is configured above the first channel for rainwater to enter the opening, a baffle is configured above the second channel to close it, and the second channel is connected to a drain pipe; at least a portion of the partition is configured with a filter screen, the first channel and the second channel are connected at the filter screen, and the second channel is filled with bioretention filler.

[0006] The beneficial effect is that the linear rainwater drain with bioretention function in the embodiment of the present application occupies a small area and can be installed in different areas, making it suitable for different scenarios. Furthermore, a filter is provided to remove suspended matter and other impurities from the rainwater. After the rainwater has been initially treated by the filter, it enters the second channel, where it is treated by the bioretention filler to remove soluble or smaller-particle pollutants. This double filtration method effectively treats pollutants in the rainwater.

[0007] Preferably, a filter screen is constructed in the area of the partition close to the opening, at least part of the filter screen is located above the bioretention filler, and the communication area between the drain pipe and the second channel is located below the top of the bioretention filler.

[0008] Preferably, a plurality of filter screens are constructed in the area near the opening of the partition, and are arranged in sequence along the length of the rain gutter. An overflow plate is provided between each two filter screens, and a water hole is defined between the side of the overflow plate close to the baffle and the baffle; wherein the overflow plate is a waterproof plate body.

[0009] Preferably, the filter screen includes a lower filter screen and an upper filter screen which are sequentially arranged along the height, and the filter holes of the lower filter screen are smaller than the filter holes of the upper filter screen.

[0010] Preferably, the filter screen is constructed with multiple layers in the thickness direction.

[0011] Preferably, it also includes a flushing pipeline, which is arranged next to the filter screen. The flushing pipeline is provided with multiple nozzles, and the water spraying direction of the nozzles is toward the filter screen.

[0012] Preferably, the bioretention filler includes: quartz sand, pyrite, and biochar; bacteria are cultured in the bioretention filler.

[0013] Specifically, the content of quartz sand is 40%-60%, the content of biochar is 20%-30%, and the content of pyrite is 20%-30%.

[0014] Preferably, bacteria cultured in the bioretention filler include Thiobacillus denitrificans; a second space is left between the bioretention filler and the bottom of the second channel, and the area where the drain pipe communicates with the second channel is located above the second space. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of a linear rainwater ditch structure coupled with a bioretention function disclosed in an embodiment of the present application; Figure 2 A schematic structural diagram of the filter screen and overflow plate disclosed in an embodiment of the present application; Figure 3 A schematic structural diagram of a linear rainwater ditch coupled with a bioretention function disclosed in an embodiment of the present application from another perspective; Figure 4 for Figure 1 A local enlarged image corresponding to area A in the middle.

[0016] In the picture: 100-rainwater ditch; 110- partition, 111- filter screen, 1111- lower filter screen, 1112- upper filter screen, 1113- first filter screen, 1114- second filter screen, 112- overflow plate; 120-first channel, 121-opening; 130-Second channel, 131-Baffle 140-drain pipe; 150-Bioretention filler; 160- flushing pipeline, 161- nozzle, 162- washing water quick connector; a-first space, b-second space, c-water hole. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work shall fall within the scope of protection of the present invention.

[0018] Rainwater usually carries certain pollutants when it falls. For example, rainwater washes away pollutants deposited on hardened surfaces such as roads and roofs (such as heavy metals, grease, suspended matter, nutrients, etc.), causing rainwater to mix with pollutants.

[0019] To process it, see Figures 1-4 An embodiment of the present application provides a linear rain gutter coupled with a bioretention function, including a rain gutter 100. A partition is provided in the rain gutter 100, which separates the rain gutter 100 into a first channel 120 and a second channel 130; an opening 121 is constructed above the first channel 120, and the opening 121 is used for the entry of rainwater; a baffle 131 is provided next to the opening 121, and the baffle 131 closes the second channel 130, and the second channel 130 is connected to a drain pipe 140; a filter screen 111 is constructed at least partially on the partition, and the second channel 130 is filled with a bioretention filler 150.

[0020] In some examples, the body of the rainwater ditch 100 can be made of resin concrete, which has the advantages of high strength, corrosion resistance, and rapid construction. Resin concrete can also be assembled and flexibly switched with conventional rainwater outlets, thereby achieving assembly and effectively improving construction and installation efficiency. A hollow cover plate can be provided over the opening 121 to allow rainwater to pass through while shielding the first channel 120.

[0021] Compared with the prior art, the bioretention facilities equipped with bioretention fillers 150 are larger in size and can only be used in specific scenarios. The linear rainwater ditch coupled with the bioretention function in this embodiment is assembled. Since it can be used in any place where rainwater is collected and occupies a small area, the application scenarios of the bioretention filler 150 are wider, and the treatment of rainwater by the bioretention filler 150 is transformed into source control rather than the current process control.

[0022] refer to Figure 1-Figure 2It is understood that rainwater slowly flows into the first channel 120 from the opening 121. For example, a hollow cover is provided above the opening 121, and rainwater enters the first channel 120 through the hollow portion. After entering the first channel 120, the rainwater will first accumulate in the first channel 120 until the water level reaches the filter 111. The filter 111 uses its fine pores to preliminarily filter the rainwater and intercept larger suspended matter and impurities. After the preliminary purification by the filter 111, the rainwater continues to flow along the first channel 120 to the second channel 130 on the other side of the partition. The second channel 130, as a relatively closed space, is filled with biological retention filler 150. In the process of rainwater penetrating the biological retention filler 150, the microorganisms in the filler and the physical and chemical effects of the filler itself further remove pollutants in the rainwater, such as heavy metal ions, nutrients, etc., to achieve deep purification of rainwater.

[0023] The purified rainwater eventually collects at the bottom of the second channel 130 and is discharged smoothly through the drain pipe 140 connected to the second channel 130. The drain pipe 140 serves as the outlet of the entire linear stormwater gutter system, safely transporting the treated clean rainwater to the urban stormwater pipe network or a designated discharge area, thereby achieving sustainable utilization and management of rainwater resources.

[0024] Exemplarily, bioretention filler 150 includes quartz sand, pyrite, and biochar. By volume, the quartz sand content is 40%-60%, the biochar content is 20%-30%, and the pyrite content is 20%-30%, with the total of these raw materials totaling 100%. The raw materials are evenly distributed to ensure good water flow capacity. Bacteria are also cultured within bioretention filler 150 to allow the bacteria to treat pollutants. Of course, in different embodiments, these raw materials can be interchangeable and are not limited to the above raw materials.

[0025] As rainwater passes through filter 111, it first effectively intercepts larger suspended solids and impurities carried by the rainwater. After initial purification by filter 111, the rainwater's quality has been improved to a certain extent. However, filter 111 cannot treat dissolved pollutants such as chemical oxygen demand (COD), nitrogen (N), and phosphorus (P). The rainwater then flows into bioretention filler 150, which is composed of a mixture of quartz sand, pyrite, and biochar in a specific proportion. It not only has excellent water permeability and water retention properties, but is also rich in microbial communities that degrade pollutants. As rainwater penetrates this filler, the microorganisms within it utilize the oxygen and nutrients in the rainwater to biodegrade pollutants such as COD, N, and P. Simultaneously, the filler's physical adsorption and chemical precipitation also assist in the removal of these pollutants.

[0026] The linear rainwater drain with bioretention function according to the embodiment of the present application occupies a small area and can be installed in different areas, making it suitable for different scenarios. Furthermore, a filter 111 is provided to remove suspended matter and other impurities from the rainwater. After the rainwater has been initially treated by the filter 111, it enters the second channel 130. The rainwater is then treated by the bioretention filler 150 within the second channel 130 to remove soluble or smaller-particle contaminants. This double filtration method effectively treats pollutants in the rainwater.

[0027] In some embodiments, as Figure 1 As shown, a filter screen 111 is constructed in the area of the partition near the opening 121 , and a certain amount of space is left above and below the bioretention filler 150 in the second channel 130 .

[0028] Specifically, the height of the bioretention filler 150 is located below the baffle 131, so that the bioretention filler 150 and the baffle 131 are separated to define a first spacing space a. At least a portion of the filter screen 111 is located above the bioretention filler 150, and the area of the baffle 131 away from the opening 121 is a water-impermeable plate, so that the first channel 120 can accumulate a certain amount of rainwater. The connecting area between the drain pipe 140 and the second channel 130 has a circular cross-section and is located below the top of the bioretention filler 150, that is, Figure 1 In the embodiment, the projection of the circular cross section is located within the projection range of the bioretention filler 150 along the drainage direction.

[0029] Illustratively, more than half of the area of the filter screen 111 is located above the bioretention filler 150. Rainwater overflowing from the first channel 120 slowly flows into the filter screen 111. After preliminary filtration by the filter screen 111, the rainwater flows out of the filter screen 111 and then flows into the top of the bioretention filler 150, or passes through the first space a before entering the top of the bioretention filler 150. This ensures that the rainwater can slowly flow out of the filter screen 111 and penetrate the entire layer of bioretention filler 150 from top to bottom; thereby, the rainwater fully contacts the bioretention filler 150, and the overflowing rainwater flows slowly, so that the rainwater stays in the bioretention filler 150 for a sufficient time, ensuring the bioretention filler 150 effectively treats the rainwater.

[0030] In some examples, the bioretention filler 150 contains denitrifying Thiobacillus and pyrite. When COD (chemical oxygen demand) is sufficient, conventional bacteria in the bioretention filler 150 can remove COD, N, and P. When COD in rainfall runoff is insufficient, denitrifying Thiobacillus can use pyrite for autotrophic denitrification, and the biochar in the filler module can act as a biological battery to compensate for the disadvantage of slow autotrophic denitrification.

[0031] Specifically, the bioretention filler 150 may be placed in a module first. Before the module containing the bioretention filler 150 is installed in the storm drain 100 , denitrifying Thiobacillus may be cultivated in the module to contain denitrifying Thiobacillus.

[0032] Continue to refer Figure 1 As shown, a certain space is left below bioretention filler 150 in second channel 130, namely, a second space b is left between bioretention filler 150 and the bottom of second channel 130, and drain pipe 140 is located above second space b. This allows rainwater to remain in second space b after flowing into it, thus providing a suitable environment for the functional Thiobacillus denitrificans in bioretention filler 150, ensuring that bioretention filler 150 can stably perform its pollutant removal function.

[0033] In some preferred examples, the capacity of the second compartment b is not less than 100 ml, for example, 150 ml, so as to store a corresponding amount of water.

[0034] Furthermore, during rainfall, the concentration of pollutants in the initial rainwater can reach 5 to 10 times that of regular rainwater, which is one of the main sources of urban non-point source pollution. As the rainfall increases, the concentration of pollutants in rainwater decreases.

[0035] To this end, in some embodiments, a plurality of filters 111 are constructed in the area of the partition near the opening 121, and are arranged in sequence along the length direction of the rain gutter 100, and an overflow plate 112 is provided between every two filters 111, and a water hole 113 is defined between the side of the overflow plate 112 close to the baffle 131 and the baffle 131.

[0036] For example Figure 1 and Figure 3 As shown, the first channel 120 and the second channel 130 are both U-shaped channels in cross section, with a partition plate disposed between them. The upper end of the partition plate is provided with a plurality of filter screens 111 and an overflow plate 112. Figure 2 As shown, the filter screen 111 is assembled with the overflow plate 112 . The overflow plate 112 is a watertight plate. The height of the overflow plate 112 is lower than that of the filter screen 111 , so that the water hole 113 is left between the upper end of the overflow plate 112 and the baffle 131 .

[0037] When the initial amount of rainwater is small, the rainwater enters the first channel 120 directly below the opening 121 from the side thereof; due to the small amount of rainwater, the rainwater slowly overflows in the first channel 120, and the overflow liquid level is located below the overflow plate 112. Due to the obstruction of the overflow plate 112, the rainwater needs to flow through the filter screen 111 to the second channel 130, and then come into contact with the bioretention filler 150 in the second channel 130. Finally, the purified water is discharged to the municipal rainwater system through the outlet pipe.

[0038] It is worth noting that when the amount of rainwater is small, the water flow rate is slow, and because the filter 111 produces a certain resistance to the rainwater, the flow rate of the rainwater flowing through the filter 111 to the bioretention filler 150 is slow, so that it is fully in contact with the bioretention filler 150 and has enough time to react with bacteria. This can effectively treat a large amount of pollutants in the early stage of rainfall.

[0039] As the rainfall continues, the amount of rainwater increases, causing the liquid level in the first channel 120 to rise rapidly. When the liquid level is flush with the upper edge of the overflow plate 112, the rainwater will quickly flow from the water hole 113 above the overflow plate 112 to the second channel 130 and then be discharged.

[0040] It is understood that during the initial rainstorm, the pollutant concentration in rainwater is high. Rainwater overflowing from first channel 120 flows through filter screen 111 to second channel 130. The low flow rate of rainwater itself slows the flow of rainwater overflowing from first channel 120, allowing it to fully contact and react with bioretention filler 150, allowing bioretention filler 150 to fully treat the pollutants. During heavy rainfall, the pollutant concentration in rainwater is relatively low. Rainwater flows rapidly from water holes 113 above overflow plate 112 to second channel 130, ensuring effective drainage of rainwater ditch 100 and preventing water accumulation. In this way, rainwater ditch 100 can fully adapt to actual rainfall conditions, achieving both excellent drainage and decontamination effects.

[0041] In some embodiments, reference Figure 2 As shown, the filter screen 111 includes a lower filter screen 1111 and an upper filter screen 1112 arranged in sequence along the height. The lower filter screen 1111 is located below the upper filter screen 1112, and the two are spliced together to form a complete filter screen 111. The filter holes of the lower filter screen 1111 are smaller than the filter holes of the upper filter screen 1112, and the lower edge of the upper filter screen 1112 is lower than the upper edge of the overflow plate 112 to ensure that the upper filter screen 1112 can filter the rainwater before it reaches the area of the water hole 113.

[0042] It is understandable that during rainfall, some mud, sediment, etc. will accumulate near the bottom area of the first channel 120. Since the lower filter 1111 located below has smaller filter holes, it can block debris such as mud, sediment, etc. and prevent them from entering the second channel 130.

[0043] Of course, those skilled in the art can also conceive of more filter structures arranged in sequence along the height direction based on the upper filter 1112 and the lower filter 1111 disclosed in this embodiment, which should also fall within the scope of protection of this application.

[0044] In some preferred embodiments, the filter screen 111 may be constructed as multiple layers, for example Figure 4 As shown, it is constructed into two layers in the thickness direction, which are defined here as a first filter screen 1113 and a second filter screen 1114. The first filter screen 1113 is close to the first channel 120, and the second filter screen 1114 is close to the second channel 130, so as to improve the filtering effect.

[0045] In addition, regarding the problem of clogging of the filter screen 111 , when the filter screen 111 is filtering suspended matter, some suspended matter with a larger diameter may block the filter screen 111 .

[0046] To this end, the linear rainwater ditch coupled with the bioretention function also includes a flushing pipe 160 arranged next to the filter 111, referring to Figure 2 and Figure 3 As shown, the flushing pipe 160 is provided with multiple nozzles 161 for flushing the filter 111. In some examples, the flushing pipe 160 is provided with a flushing water quick connector for connecting to an external water source. Thus, by embedding the nozzles 161 and the flushing pipe 160, routine maintenance and management are simplified, and the efficiency of the rain gutter 100 is also improved.

[0047] The foregoing description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Rather, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the concept described herein through the above teachings or techniques or knowledge in the relevant field. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the appended claims.

Claims

1. A linear rainwater ditch coupled with bioretention function, characterized in that: The rainwater ditch comprises a partition plate provided in the rainwater ditch, wherein the partition plate separates the rainwater ditch into a first channel and a second channel; An opening is constructed above the first channel, and the opening is used for the entry of rainwater. A baffle is provided above the second channel to close it, and the second channel is connected to a drain pipe. The partition is at least partially constructed with a filter screen, and the first channel and the second channel are connected at the filter screen. The second channel is filled with biological retention filler.

2. The linear rainwater ditch coupled with bioretention function according to claim 1, characterized in that: The partition is configured with a filter in an area close to the opening, at least a portion of the filter is located above the bioretention filler, and the communicating area between the drain pipe and the second channel is located below the top of the bioretention filler.

3. The linear rainwater ditch coupled with bioretention function according to claim 2, characterized in that: The partition is constructed with multiple filter screens in the area near the opening, and is arranged in sequence along the length direction of the rain gutter. An overflow plate is provided between every two filter screens, and a water hole is defined between the side of the overflow plate close to the baffle and the baffle; wherein the overflow plate is a waterproof plate body.

4. The linear rainwater ditch coupled with bioretention function according to claim 2, characterized in that: The filter screen comprises a lower filter screen and an upper filter screen which are sequentially arranged along the height, and the filter holes of the lower filter screen are smaller than the filter holes of the upper filter screen.

5. The linear rainwater ditch coupled with bioretention function according to claim 2, characterized in that: The filter screen is constructed with multiple layers in the thickness direction.

6. The linear rainwater ditch coupled with bioretention function according to claim 2, characterized in that: It also includes a flushing pipeline, which is arranged next to the filter screen. The flushing pipeline is provided with a plurality of nozzles, and the water spraying direction of the nozzles is toward the filter screen.

7. The linear rainwater ditch coupled with bioretention function according to claim 1, characterized in that: The bioretention filler includes: quartz sand, pyrite, and biochar; Bacteria are cultured in the bioretention filler.

8. The linear rainwater ditch coupled with bioretention function according to claim 7, characterized in that: The content of the quartz sand is 40%-60%, the content of the biochar is 20%-30%, and the content of the pyrite is 20%-30%.

9. The linear rainwater ditch coupled with bioretention function according to claim 7 or 8, characterized in that: The bacteria cultured in the bioretention filler include Thiobacillus denitrificans; A second spacing space is left between the bioretention filler and the bottom of the second channel, and the area where the drainage pipe communicates with the second channel is located above the second spacing space.

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