River rainwater infiltration system

Abstract

The invention relates to the technical field of rainwater filtration, and provides a river rainwater infiltration system. The riverway rainwater infiltration system is arranged on slopes on the two sides of a riverway in the length direction of the riverway and comprises a collection groove, a rainwater collection groove and a rainwater collection groove, a water inlet of the percolation ditch is communicated with the collecting groove, and a water outlet of the percolation ditch is communicated with the river channel; the filtering assembly is arranged in the percolation ditch and is used for filtering water flowing through the percolation ditch. The riverway rainwater infiltration system can effectively solve the problem that in the prior art, rainwater is directly discharged into a river to affect the water quality, and the water quality of the river is improved.

Description

Technical Field

[0001] This application relates to the field of rainwater filtration technology, and more particularly to a river rainwater infiltration system. Background Technology

[0002] Urban river water pollution is a prominent problem, with rainwater runoff being a significant source of pollution, and its inflow process suffers from significant technical deficiencies. In existing rainwater drainage systems, initial rainwater carries pollutants such as surface sediment, oil, heavy metals, and organic matter, flowing directly into rivers without effective treatment, exacerbating eutrophication and blackening / odorization, and severely damaging river water quality. Summary of the Invention

[0003] This application provides a river rainwater infiltration system to solve the problem of rainwater being directly discharged into rivers and affecting water quality in the prior art, thereby improving the water quality of rivers.

[0004] A river rainwater infiltration system according to a first aspect of this application is provided on the slopes on both sides of the river along the length of the river. The river rainwater infiltration system includes: A collection channel extends along the length of the river channel; The infiltration ditch has an inlet connected to the collection tank and an outlet connected to the river channel. A filter assembly is provided in the percolation trench to filter the water flowing through the percolation trench.

[0005] According to one embodiment of this application, the river rainwater infiltration system further includes a support component disposed within the infiltration ditch, the support component being disposed between the filter component and the bottom wall of the infiltration ditch; The lower end of the support component contacts the bottom wall of the percolation trench, and a flow cavity is formed between the filter component and the bottom wall of the percolation trench, the flow cavity extending through the length of the percolation trench; or, the lower end of the support component forms a flow cavity between the bottom wall of the percolation trench, the flow cavity extending through the length of the percolation trench.

[0006] According to one embodiment of this application, the support assembly includes a grid plate, the grid plate including a plurality of support plates extending along the length direction of the infiltration trench, and adjacent support plates are connected by connecting ribs; The lower end of the support assembly contacts the bottom wall of the percolation trench; the lower end of the support plate abuts against the bottom wall of the percolation trench, and the upper end of the support plate abuts against the filter assembly; a flow channel is formed between adjacent support plates.

[0007] According to one embodiment of this application, the river rainwater infiltration system further includes a water storage component, the water storage component comprising: A water storage tank is installed on the bottom wall of the infiltration ditch; The water-absorbing component has one end disposed in the water storage tank and the other end extended into the filter component to introduce water from the water storage tank into the filter component.

[0008] According to one embodiment of this application, the water-absorbing component includes a clay tube, a sponge strip, or a non-woven fabric sheet.

[0009] According to one embodiment of this application, the filter assembly further includes a first protective net disposed between the filter assembly and the support assembly to restrict the filter assembly from falling into the flow cavity.

[0010] According to one embodiment of this application, the filter assembly further includes a second protective net covering the top of the filter assembly, or the second protective net covering the upper opening of the collecting tank and the permeation trench.

[0011] According to one embodiment of this application, the river rainwater infiltration system further includes a fixing component, which is fixed to the slope on both sides of the river and connected to the edge portion of the second protective net located on both sides of the infiltration ditch to fix the second protective net.

[0012] According to one embodiment of this application, the filter assembly includes filter media particles, the surface of which is coated with microorganisms.

[0013] According to one embodiment of this application, the particle size of the filter material is greater than or equal to 8 mm and less than or equal to 25 mm.

[0014] The above-described one or more technical solutions in the embodiments of this application have at least one of the following technical effects: The river rainwater infiltration system described in this application filters some of the rainwater flowing into the river by installing filter components within the infiltration ditch, preventing rainwater containing high levels of pollutants from directly entering the river and thus improving the river's water quality. Furthermore, by installing a collection trough extending along the length of the river at the inlet side of the infiltration ditch, more rainwater enters the infiltration ditch through the collection trough for filtration, adsorption, and decomposition, reducing pollutants in the rainwater and further improving the river's water quality. Moreover, the aforementioned rainwater infiltration system does not include baffles or other components that significantly obstruct rainwater flow, ensuring that rainwater will not be hindered from entering the river during heavy rains or other periods of abundant rainfall, thus guaranteeing the safety of the flood control and drainage project.

[0015] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the river rainwater infiltration system in this application.

[0018] Figure 2 for Figure 1 Sectional view of AA.

[0019] Figure 3 Schematic diagram of the collection channel and infiltration ditch on one side of the river channel Figure 1 .

[0020] Figure 4 Schematic diagram of the collection channel and infiltration ditch on one side of the river channel Figure 2 (Equipped with a water storage component).

[0021] Figure 5 for Figure 1 Cross-sectional view of the middle section (BB).

[0022] Figure 6 for Figure 1 Cross-sectional view of the middle CC section.

[0023] Figure 7 for Figure 1 Cross-sectional view of DD.

[0024] Figure label: 1. Collection tank; 2. Infiltration trench; 21. Flow cavity; 3. Filter assembly; 31. First protective net; 32. Second protective net; 33. Filter media particles; 4. Support assembly; 5. Water storage assembly; 51. Water storage tank; 52. Water absorption assembly; 6. Fixing assembly; 7. River channel; 71. Slope. Detailed Implementation

[0025] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but should not be used to limit the scope of this application.

[0026] In the description of the embodiments of this application, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0028] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0029] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples. The term "multiple" in the embodiments of this application should be understood as two or more.

[0030] A river rainwater infiltration system according to an embodiment of the first aspect of this application, such as Figure 1As shown, the river rainwater infiltration system is set on the slopes 71 on both sides of the river 7 along the length of the river 7. It includes: a collection tank 1, which extends along the length of the river 7; an infiltration ditch 2, with the inlet connected to the collection tank 1 and the outlet connected to the river 7; and a filter assembly 3, which is installed in the infiltration ditch 2 to filter the water flowing through the infiltration ditch 2. Figure 1 The long arrow in channel 7 indicates the direction of water flow in the channel.

[0031] The collection trough 1, extending along the length of the river channel 7, can systematically collect rainwater from the slopes 71 on both sides of the river channel 7. This concentrates rainwater that might otherwise flow randomly along the slopes 71 and directs it to the infiltration ditch 2, reducing the likelihood of rainwater directly scouring the slopes 71 and carrying large amounts of sediment, fallen leaves, and surface pollutants into the river channel 7. This expands the scope of rainwater treatment from the source. The inlet of the infiltration ditch 2 is connected to the collection trough 1, and the outlet is connected to the river channel 7, forming a complete path from rainwater collection to purification and then to discharge. This ensures that all collected rainwater can enter the infiltration ditch 2 for treatment before flowing into the river channel 7.

[0032] The filter components 3 installed in the infiltration ditch 2 can filter, adsorb, and decompose rainwater at multiple levels, effectively removing suspended particulate matter, organic pollutants, and some heavy metals from the rainwater. This reduces the pollutant content in the rainwater that directly enters the river channel 7, thereby improving the water quality of the river channel 7 and alleviating eutrophication and black and odorous problems. At the same time, the system does not have baffles or other components that significantly obstruct rainwater flow. In cases of heavy rain or other heavy rainfall, rainwater can smoothly enter the river channel 7 through the outlet of the infiltration ditch 2, preventing water accumulation on the slope 71 or a sudden rise in the water level of the river channel 7 due to drainage obstruction. This ensures the safety of the flood control and drainage project and achieves a synergistic balance between water quality improvement and flood control and drainage.

[0033] According to one embodiment of this application, the river rainwater infiltration system further includes a support component 4 disposed within the infiltration ditch 2. The support component 4 is disposed between the filter component 3 and the bottom wall of the infiltration ditch 2. The lower end of the support component 4 contacts the bottom wall of the infiltration ditch 2 (not shown in the figure) to form a flow cavity 21 between the filter component 3 and the bottom wall of the infiltration ditch 2. The support component 4 is located in the flow cavity 21. The flow cavity 21 extends through the length of the infiltration ditch 2.

[0034] The support component 4 is positioned between the filter component 3 and the bottom wall of the infiltration ditch 2. By supporting the filter component 3 away from the bottom wall of the infiltration ditch 2, a flow cavity 21 is formed between the filter component 3 and the bottom wall of the infiltration ditch 2, extending along the length of the infiltration ditch 2. This directly alters the flow path and speed of rainwater after passing through the filter component 3. Rainwater filtered by the filter component 3 does not need to slowly infiltrate or accumulate at the bottom of the filter component 3; it can directly enter the flow cavity 21. Utilizing the permeability and tilt angle of the flow cavity 21, it flows rapidly along the length of the infiltration ditch 2, ultimately discharging into the river channel 7 from the outlet. This effectively accelerates the discharge speed of rainwater. Especially in scenarios with heavy rainfall, it reduces rainwater retention downstream of the filter component 3, preventing excessively high water levels in the infiltration ditch 2 due to poor drainage, thereby ensuring the safety of flood control and drainage.

[0035] The presence of the flow chamber 21 creates a gap between the filter assembly 3 and the bottom wall of the infiltration ditch 2, preventing excessive accumulation of silt or sediment at the bottom of the filter assembly 3. It also prevents localized silt buildup in the filter assembly 3 from reducing the overall water flow. While silt is already present in the river channel 7, rainwater-carried silt entering the river channel 7 does not cause pollution. However, silt clogging the filter assembly 3 can affect the water flow rate within it. By suspending the filter assembly 3 and installing the flow chamber 21, silt that was previously blocked by the filter media particles 33 and accumulated at the bottom of the filter assembly 3 will fall directly into the flow chamber 21 and flow into the river channel 7 with the water, thus completely preventing silt from accumulating at the bottom of the filter assembly 3 and affecting the water flow rate.

[0036] The support component 4 provides stable support for the filter component 3, preventing it from settling due to rainwater impact, its own weight, or long-term operation. This avoids deformation or structural damage to the filter component 3, thus maintaining its integrity and the stability of its filtration function, and extending the system's service life. Furthermore, the through-flow structure of the flow chamber 21 facilitates later inspection and cleaning of the bottom of the filter component 3 and the bottom wall of the infiltration trench 2, reducing maintenance difficulty and ensuring long-term effective system operation.

[0037] In some cases, a flow cavity 21 can also be formed between the lower end of the support component 4 and the bottom wall of the permeation trench 2, such as... Figure 3 As shown, the thickness of the support component 4 is ignored (or it can be regarded as a plane with a small thickness). A flow cavity 21 is formed between the support component 4 and the infiltration trench 2. No structure is set in the flow cavity 21 so that rainwater can flow more quickly.

[0038] According to one embodiment of this application, the support assembly 4 includes a grid plate (not shown in the figure), the grid plate includes a plurality of support plates extending along the length direction of the permeation trench 2, and adjacent support plates are connected by connecting ribs; based on the lower end of the support assembly 4 contacting the bottom wall of the permeation trench 2: the lower end of the support plate abuts against the bottom wall of the permeation trench 2, and the upper end of the support plate abuts against the filter assembly 3; a flow channel is formed between adjacent support plates.

[0039] The support assembly 4 adopts a grid structure, with multiple support plates extending along the length of the infiltration trench 2. The extension direction of the support plates aligns with the mainstream direction of rainwater within the flow chamber 21, minimizing obstruction to water flow and preventing turbulence or energy loss caused by the structure itself. This ensures smooth flow of filtered rainwater along the flow channel, further improving rainwater discharge speed. Adjacent support plates are connected by connecting ribs to form an integrated load-bearing structure. This enhances the overall rigidity of the grid and evenly distributes the weight of the filter assembly 3 and the load generated by rainwater impact, preventing deformation of individual support plates due to excessive local stress. This ensures stable support of the filter assembly 3 by the support assembly 4, preventing the filter assembly 3 from settling or tilting.

[0040] It should be noted that although the extension direction of the connecting rib is perpendicular to the mainstream direction of rainwater in the flow cavity 21, the connecting rib can be set to a smaller size (smaller diameter) and located at the top of the support plate to minimize the obstruction of the connecting rib to the flow of rainwater.

[0041] The flow chamber 21 is divided by multiple support plates to form multiple flow channels, which allows the filtered rainwater to flow quickly through multiple parallel flow channels, reducing local congestion caused by water flow convergence. At the same time, the spacing of the flow channels can disperse the water flow, prevent impurities from accumulating locally in the flow chamber 21, and reduce the risk of blockage in the flow chamber 21.

[0042] The grid structure composed of the support plate and connecting ribs is lightweight, which can reduce the load on the bottom wall of the infiltration ditch 2 and adapt to the installation requirements of slopes 71 with different geological conditions. At the same time, the grid plate made of metal or high-strength plastic has strong corrosion resistance and can adapt to the humid environment in rainwater and soil for a long time, thus extending the service life of the support component 4.

[0043] According to one embodiment of this application, such as Figure 4 As shown, the river rainwater infiltration system also includes a water storage component 5, which includes: a water storage tank 51, which is set on the bottom wall of the infiltration ditch 2, that is, on the bottom wall of the flow cavity 21. After the rainwater is collected in the water storage tank 51, the excess rainwater can continue to flow downward into the river 7. In other words, the water storage tank 51 will not affect the normal flow of rainwater into the river 7; and a water absorption component 52, one end of which is set in the water storage tank 51 and the other end extends into the filter component 3 to introduce the water in the water storage tank 51 into the filter component 3.

[0044] Along the width direction of the infiltration trench (i.e., perpendicular to) Figure 4 (in the direction shown), the width of the water storage tank 51 can be smaller than the width of the infiltration ditch 2.

[0045] The water storage component 5, in conjunction with the water storage tank 51 and the water absorption component 52, can collect and store some rainwater during rainfall, providing continuous moisture for the filter component 3 during drought periods. This effectively solves the problem of decreased microbial activity in the filter component 3 due to dryness during prolonged periods without rain. The water storage tank 51 is located on the bottom wall of the infiltration trench 2 and can directly receive rainwater that has permeated through the filter component 3. No additional water intake structure is required; water storage is achieved through the infiltration of rainwater itself, simplifying the overall structure of the system. Multiple water storage tanks 51 can be installed along the length of the infiltration trench 2 to form a continuous water storage space, ensuring that the stored water volume is sufficient to maintain the filtration component 3 in a moist state during drought periods, preventing the filter component 3 from failing to purify due to localized water shortage.

[0046] One end of the water-absorbing component 52 is located in the water storage tank 51, and the other end extends into the filter component 3. Through its own capillary action, it continuously introduces water from the water storage tank 51 into the filter component 3, ensuring even distribution of water within the filter material and maintaining the overall moisture level of the filter component 3. This water delivery method requires no external power and relies solely on the physical properties of the materials, reducing system energy consumption and maintenance costs. Simultaneously, the water-absorbing component 52 precisely controls the amount of water delivered, preventing water accumulation inside the filter component 3 due to excessive water replenishment, which could affect normal rainwater filtration. It also prevents insufficient water replenishment from hindering microbial activity, ensuring that the filter component 3 maintains stable purification efficiency even during dry periods.

[0047] The combined structure of the water storage tank 51 and the water absorption component 52 does not affect the normal drainage function of the infiltration ditch 2. During rainfall, excess rainwater can flow into the flow cavity 21 through the gap above the water storage tank 51 and then be discharged into the river channel 7. This does not hinder rainwater discharge and takes into account both water storage and flood control and drainage needs.

[0048] According to one embodiment of this application, the water-absorbing component 52 includes a clay tube, a sponge strip, or a non-woven fabric sheet.

[0049] The water-absorbing component 52 utilizes its structural characteristics to achieve natural water transport through capillary action, effectively solving the problem of decreased microbial activity in the filter component 3 due to water shortage during droughts. The clay tube, made of porous ceramic with numerous fine pores inside, continuously draws water from the storage tank 51 and allows it to permeate upwards through capillary action. Its rigid structure provides stable support inside the filter component 3, preventing blockage of the water delivery channels due to filter material compression, making it suitable for scenarios requiring directional and long-term water delivery. The sponge strip has abundant three-dimensional mesh pores and a soft texture, allowing it to closely conform to the irregular gaps in the filter component 3. Upon contact with water in the storage tank 51, it quickly absorbs water and diffuses it into the filter component 3 through capillary force between the pores, resulting in good water delivery uniformity, especially suitable for areas with finer filter material particles. The non-woven fabric sheet has a porous structure formed by interwoven fibers, which has a large surface area. After being laid, it can cover a wide area at the bottom of the filter assembly 3. After one end is immersed in the water storage tank 51 to absorb water, the water can quickly diffuse laterally along the fiber gaps, realizing large-area, low-resistance water delivery, which is suitable for situations where the overall wettability of the filter assembly 3 is required to be high.

[0050] The water absorption component 52 can be made of clay tubes, sponge strips, or non-woven fabric sheets. It requires no external power and completes water delivery solely through physical capillary action, reducing system energy consumption and failure risk. Furthermore, the material is low-cost, highly corrosion-resistant, and can adapt to the humid and impurity-rich environment within the infiltration trench 2, ensuring long-term durability. In addition, its diverse form allows for flexible selection based on the thickness and material of the filter component 3 and the arrangement of the water storage tank 51, ensuring efficient water delivery from the storage tank 51 to the filter component 3 in various scenarios, maintaining the filter component 3's moisture level and the degradation activity of microorganisms.

[0051] In some cases, the water-absorbing component 52 may also be made of coconut fiber bundles or polyester fiber felt. Coconut fiber bundles are woven from natural fibers, have abundant pores and strong hydrophilicity, provide a stable water delivery rate, and are biodegradable, making them suitable for areas with high requirements for ecological compatibility. Polyester fiber felt is made of synthetic fibers, has a dense structure, excellent water retention performance, and low water evaporation loss during water delivery, making it suitable for areas with dry climates and high evaporation rates, and extending the effective wetting time of a single water storage.

[0052] According to one embodiment of this application, such as Figure 3 As shown, the filter assembly 3 also includes a first protective net 31, which is disposed between the filter assembly 3 and the support assembly 4 to prevent the filter assembly 3 from falling into the flow cavity 21. The edge of the first protective net 31 can be fixedly connected to the support assembly 4 (grating), or the edge of the first protective net 31 can be buried together with the support assembly 4 in the soil on both sides for fixation. Figure 6 As shown.

[0053] The first protective net 31 is installed between the filter assembly 3 and the support assembly 4. Its mesh structure forms a physical barrier, effectively preventing filter media particles 33 in the filter assembly 3 from falling into the flow cavity 21 due to rainwater impact, gravity settling, or loosening after long-term use. During long-term operation, the filter media (such as ceramsite, limestone, etc.) in the filter assembly 3 may experience small particle shedding due to water erosion or localized collapse due to overall structural loosening. If these particles fall directly into the flow cavity 21, they will block the flow channel of the support assembly 4, hindering rainwater discharge and even affecting flood control and drainage during heavy rain. The mesh diameter of the first protective net 31 is smaller than the minimum particle diameter of the filter media, strictly confining the filter media particles 33 inside the filter assembly 3, ensuring that the flow cavity 21 remains unobstructed and maintaining smooth rainwater discharge.

[0054] Meanwhile, the first protective net 31 helps to distribute the weight of the filter assembly 3 and reduce the local load on the support assembly 4. The filter assembly 3 is quite heavy after being filled with filter media, and long-term use may cause the support plate of the support assembly 4 to deform due to excessive local pressure. The first protective net 31 covers the support assembly 4, evenly transferring the weight of the filter assembly 3 to multiple support plates, avoiding damage to a single support plate due to overload, extending the service life of the support assembly 4, and maintaining the overall structural stability of the filter assembly 3, preventing the filter media from forming filtration blind spots due to local collapse, and ensuring the uniformity of the filtration effect.

[0055] The first protective net 31 is made of a corrosion-resistant material with a certain degree of toughness (such as stainless steel mesh or polymer composite mesh). It can adapt to changes in the gap between the filter component 3 and the support component 4, and resist the erosion of rainwater and impurities in the filter material. It is not easily damaged during long-term use. Its mesh structure has good water permeability. After being filtered by the filter component 3, rainwater can smoothly pass through the mesh and enter the flow channel without increasing additional water flow resistance, thus balancing protection and drainage efficiency.

[0056] According to one embodiment of this application, such as Figure 3 As shown, the filter assembly 3 also includes a second protective net 32, which covers the top of the filter assembly 3, or the second protective net 32 ​​covers the upper opening of the collecting tank 1 and the permeation trench 2.

[0057] When the second protective net 32 ​​covers the filter assembly 3, it forms a top constraint on the filter assembly 3, and uses its own tension to tightly fix the filter media inside the filter assembly 3, preventing local bulging, collapse, or particle loss of the filter media caused by rainwater impact or slope inclination 71, thus maintaining the structural integrity of the filter assembly 3. At the same time, its mesh diameter is smaller than the size of debris such as stones, branches, and leaves, which can directly intercept large particles of impurities carried by rainwater, preventing these debris from falling into the filter assembly 3 and clogging the gaps in the filter media. If debris enters the filter media, it will obstruct the rainwater infiltration path, not only reducing filtration efficiency, but also potentially causing local water accumulation due to poor drainage during heavy rain. The second protective net 32 ​​reduces such clogging risks from the source by intercepting at the front end, ensuring the long-term stable filtration performance of the filter assembly 3.

[0058] When the second protective net 32 ​​covers the upper openings of the collecting trough 1 and the infiltration ditch 2, a comprehensive protection system is formed. The collecting trough 1 can also be filled with filter components 3. The second protective net 32 ​​simultaneously protects the filter media within the collecting trough 1, preventing it from being contaminated by debris washed away from the ground or from becoming structurally loose. The protective net can intercept flowing debris such as leaves and plastic, preventing them from entering the infiltration ditch 2 with rainwater and clogging the filter components 3, thus achieving full-process impurity interception from rainwater inflow to filtration. This comprehensive coverage method also reduces the frequency of manual debris removal and lowers system maintenance costs.

[0059] The second protective net 32 ​​can be made of high-strength, corrosion-resistant materials (such as stainless steel mesh, galvanized steel wire mesh, or high-molecular-weight polyethylene mesh), possessing sufficient tensile strength to resist rainwater impact and debris collision. It is also resistant to acid and alkali corrosion, allowing it to adapt to the humid, polluted environment surrounding the river channel 7 for extended periods, and is not prone to losing its protective function due to rust or aging. Its mesh structure has good permeability, allowing rainwater to smoothly pass through the mesh openings into the filter assembly 3 or the collection tank 1, without obstructing normal rainwater flow due to its protective function, thus balancing protection and water collection efficiency.

[0060] According to one embodiment of this application, such as Figure 6 As shown, the river rainwater infiltration system also includes a fixing component 6, which is fixed in the slope 71 on both sides of the river 7 and connected to the edge portion of the second protective net 32 ​​located on both sides of the infiltration ditch 2 to fix the second protective net 32.

[0061] The fixing component 6 is pre-embedded in the slope 71 on both sides of the river channel 7, providing a stable anchoring foundation for the second protective net 32. This effectively resists the impact of rainwater, wind force, and the tensile force generated by the accumulation of debris, preventing the second protective net 32 ​​from shifting, being lifted, or being torn due to external forces. If the second protective net 32 ​​is not securely fixed, it may be washed away by the water flow during heavy rain, causing stones, leaves, and other debris to directly enter the filter component 3 or the infiltration ditch 2, resulting in filter media blockage and affecting filtration efficiency and drainage. The fixing component 6, through a reliable connection with the edge of the second protective net 32, can firmly fix it in the preset position, ensuring that the second protective net 32 ​​always covers the top of the filter component 3 or the upper opening of the collection tank 1 or the infiltration ditch 2, maintaining a complete protection range.

[0062] The slopes 71 on both sides of the river channel 7 have a certain gradient, and the soil or rock may experience slight settlement or deformation due to rainwater erosion and geological activity. The fixing components 6 are pre-embedded inside the slope 71, penetrating deep into the soil or rock to form an anchoring effect. Their stress points are distributed deep within the slope 71, making them more able to withstand lateral and longitudinal tensile forces than surface fixing, thus preventing fixing failure due to loosening of the surface layer of the slope 71. This pre-embedding method also reduces surface disturbance of the slope 71, reduces the impact of soil erosion on the fixing structure, and ensures that the fixing strength does not decrease during long-term use.

[0063] The connection between the fixing component 6 and the edge of the second protective net 32 ​​ensures that the second protective net 32 ​​remains taut, preventing wrinkles caused by slack. Wrinkles can easily create dead corners where debris accumulates, preventing rainwater from smoothly passing through the protective net into the system and even causing localized water accumulation. In contrast, the taut surface of the second protective net 32 ​​is flat, allowing rainwater to penetrate evenly and intercepted debris to be distributed evenly, facilitating subsequent cleaning. It also reduces stress concentration at wrinkles, which can cause damage to the protective net and extend its service life.

[0064] The structural design of the fixing component 6 can adapt to different slope materials (such as clay, sand, and rock). By adjusting the pre-buried depth and distribution density, it can provide sufficient fixing force under various geological conditions. Moreover, its pre-buried installation does not affect the normal drainage function of the collection trough 1 and the infiltration ditch 2, nor does it interfere with the structural integrity of the filter component 3. It works in synergy with other components of the system to ensure the stable operation of the entire rainwater infiltration system.

[0065] According to one embodiment of this application, the filter assembly 3 includes filter media particles 33, the surface of which is covered with microorganisms.

[0066] The filter assembly 3 uses filter media particles 33 with microorganisms attached to their surface. Through the synergistic effect of physical filtration and biodegradation, it can significantly improve the rainwater purification effect. The filter media particles 33 themselves have a rich porous structure, which can remove suspended particulate matter, colloids and some heavy metals in rainwater through physical actions such as interception and adsorption, reducing solid pollutants entering the river channel 7. Meanwhile, the microorganisms attached to their surface (such as nitrifying bacteria, denitrifying bacteria, heterotrophic bacteria, etc.) can decompose soluble substances such as organic pollutants and nitrogen and phosphorus compounds in rainwater through metabolism, solving the problem that simple physical filtration is difficult to remove soluble pollutants, and reducing rainwater pollution to the river channel 7 from multiple dimensions.

[0067] The filter media particles 33 provide a stable attachment carrier for microorganisms, preventing them from being directly washed away by rainwater and ensuring the continuity of biodegradation function. Simultaneously, the porous structure of the filter media particles 33 creates a suitable microenvironment for microbial survival, providing them with habitat space and allowing nutrients to be delivered through water flow, maintaining the activity and diversity of the microbial community. This "carrier-microorganism" combination structure enables the filter assembly 3 to maintain both physical filtration efficiency and biodegradation capacity through microbial self-reproduction during long-term operation, reducing the need for frequent filter media replacement and lowering system maintenance costs.

[0068] The selection of filter media particles 33 (such as ceramsite, zeolite, limestone, etc.) can be adjusted according to the characteristics of rainwater pollutants, and can specifically adsorb specific pollutants. The microbial community will also be naturally acclimatized with the influent water quality, enhancing its adaptability to the degradation of local rainwater pollutants, so that the filter component 3 can adapt to the water quality characteristics of different regions and improve the universality of the system.

[0069] In some cases, the filter media particles 33 can be layered according to a particle size gradient. The upper layer uses large-particle filter media (which helps to trap large particulate impurities and provides oxygen exchange space for microorganisms), while the lower layer uses small-particle filter media (which enhances adsorption capacity and is suitable for the survival of anaerobic microorganisms). The layered structure can form an aerobic-anaerobic microenvironment gradient, promote the synergistic effect of different microbial communities, improve the removal efficiency of pollutants such as nitrogen and phosphorus, and reduce the risk of overall clogging of the filter media layer.

[0070] According to one embodiment of this application, the particle size of the filter material particles 33 is greater than or equal to 8 mm and less than or equal to 25 mm.

[0071] The particle size of the filter media particles 33 is controlled between 8mm and 25mm, which can achieve a balance between physical filtration and smooth water flow. Within this particle size range, appropriately sized gaps can be formed between the filter media particles 33, which are sufficient to intercept fine pollutants that can directly pass through the filter assembly 3 into the river channel 7, while preventing excessive resistance to rainwater infiltration due to excessively small gaps. This ensures that rainwater can smoothly pass through the filter assembly 3 under the action of gravity, especially during heavy rain, which can reduce water accumulation upstream of the filter assembly 3 and ensure that the flood control and drainage functions are not affected.

[0072] Meanwhile, the filter media particles 33 of this size have sufficient specific surface area, providing stable attachment sites for microorganisms. The gaps between the particles form good ventilation and water exchange channels, facilitating the transfer of oxygen and nutrients to the microbial community, maintaining the metabolic activity of microorganisms, and ensuring the efficient performance of biodegradation. The particles of this size also have high strength, making them less prone to breakage under rain impact and their own gravity. This reduces the amount of fine debris generated by wear on the filter media particles 33, lowering the risk of clogging in the flow cavity 21 or support assembly 4, extending the service life of the filter assembly 3, and reducing maintenance frequency.

[0073] The following examples illustrate the dimensional parameters of a river stormwater infiltration system: The width of the infiltration ditch 2 can be 0.5m and the depth can be 0.8m, with a spacing of 10m on the slope 71 of the river channel 7. The cross-sectional structure of the infiltration ditch 2 is as follows from bottom to top: a 0.2m suspended fiberglass grating (i.e., support component 4) is installed, and a stainless steel wire mesh (i.e., first protective net 31) is laid on it. Then, a 0.6m thick biological filler (i.e., filter media particles 33) is filled in. A stainless steel wire mesh (i.e., second protective net 32) is laid on the surface of the biological filler and fixed with stainless steel flat steel (i.e., fixing component 6).

[0074] The specifications for the biological filler are as follows: a. The biological filler is a high-efficiency biological aggregate, with a suitable particle size of 8-25mm, a specific surface area of ​​1000-2000m² / m³, and a bulk density of not less than 1000kg / m³. Volcanic rock ceramsite, limestone, and other aggregates that are abundant, inexpensive, have a large adsorption capacity (nitrogen, phosphorus, and other nutrients), are environmentally non-toxic, harmless, and easily regenerable can be selected. b. The content of aggregate particles with non-compliant particle size distribution is ≤5%, the mud content (by mass) is ≤1.0%, and it is free of impurities such as grass roots, leaves, branches, plastics, coal lumps, and slag. In practical applications, the aggregate particle size can be adjusted according to the permeability coefficient and clogging conditions. c. It has strong stability, does not dissolve in water, and does not contain toxic substances. d. The total amount of composite microorganisms attached to the surface is not less than 3000g / m³, with preference given to those with a higher number of effective viable bacteria.

[0075] The river rainwater infiltration system provided in this application embodiment can be constructed using the following methods: Earthwork excavation; A fiberglass grating is installed in the foundation trench (i.e., the infiltration trench 2). The fiberglass grating can be installed at a height of 0.2m from the bottom wall of the foundation trench (i.e., the fiberglass grating itself is relatively thin), or the fiberglass grating can be installed from the bottom wall of the foundation trench and extended upward to a height of 0.2m (i.e., the height of the fiberglass grating is 0.2m).

[0076] Lay stainless steel wire mesh (i.e., the first protective net 31). Fill the trench with biological aggregate (i.e., filter media particles 33) up to the top of the trench; Then lay another layer of stainless steel wire mesh (i.e., the second protective mesh 32). The wire mesh (i.e., the second protective mesh 32) is fixed with stainless steel flat bars (i.e., fixing component 6); Backfilling.

[0077] The river rainwater infiltration system provided in this application embodiment is applicable to plain ditches. It allows rainwater to pass through the infiltration ditch 2, undergoing natural infiltration, filtration, and purification through reaction with microorganisms before being discharged into the river 7. This achieves the purpose of purifying and removing pollutants from the rainwater, and can also replace the rainwater sieve (rainwater inlet) in the river 7 without increasing the land area. It is easy to construct, has a wide range of applications, and is convenient to manage and maintain. It only requires regular cleaning of debris left on the infiltration ditch 2 and regular water replenishment during the dry season.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate this application and are not intended to limit this application. Although this application has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of this application do not depart from the spirit and scope of the technical solutions of this application and should be covered within the scope of the claims of this application.

Claims

1. A river rainwater infiltration system, disposed on the slopes (71) on both sides of the river (7) along the length of the river (7), characterized in that, include: The collection channel (1) extends along the length of the river channel (7); The infiltration ditch (2) has an inlet connected to the collection trough (1) and an outlet connected to the river channel (7); A filter assembly (3) is provided in the percolation trench (2) to filter the water flowing through the percolation trench (2).

2. The river rainwater infiltration system according to claim 1, characterized in that, It also includes a support component (4) disposed within the percolation trench (2), the support component (4) being disposed between the filter component (3) and the bottom wall of the percolation trench (2); The lower end of the support component (4) contacts the bottom wall of the percolation trench (2), and a flow cavity (21) is formed between the filter component (3) and the bottom wall of the percolation trench (2), the flow cavity (21) extending through the length of the percolation trench (2); or A flow cavity (21) is formed between the lower end of the support component (4) and the bottom wall of the permeation trench (2), and the flow cavity (21) extends along the length of the permeation trench (2).

3. The river rainwater infiltration system according to claim 2, characterized in that, The support assembly (4) includes a grid plate, which includes a plurality of support plates extending along the length direction of the permeation trench (2), and adjacent support plates are connected by connecting ribs. Based on the fact that the lower end of the support component (4) is in contact with the bottom wall of the permeation trench (2): the lower end of the support plate abuts against the bottom wall of the permeation trench (2), and the upper end of the support plate abuts against the filter component (3); a flow channel is formed between adjacent support plates.

4. The river rainwater infiltration system according to claim 2, characterized in that, It also includes a water storage component (5), which comprises: A water storage tank (51) is installed on the bottom wall of the infiltration ditch (2); The water absorption component (52) has one end set in the water storage tank (51) and the other end extended into the filter component (3) to introduce water from the water storage tank (51) into the filter component (3).

5. The river rainwater infiltration system according to claim 4, characterized in that, The water-absorbing component (52) includes a clay tube, a sponge strip, or a non-woven fabric sheet.

6. The river rainwater infiltration system according to claim 2, characterized in that, The filter assembly (3) further includes a first protective net (31), which is disposed between the filter assembly (3) and the support assembly (4) to restrict the filter assembly (3) from falling into the flow cavity (21).

7. The river rainwater infiltration system according to any one of claims 1 to 6, characterized in that, The filter assembly (3) further includes a second protective net (32) which covers the top of the filter assembly (3) or covers the upper opening of the collection tank (1) and the permeation trench (2).

8. The river rainwater infiltration system according to claim 7, characterized in that, It also includes a fixing component (6), which is fixed in the slope (71) on both sides of the river channel (7) and connected to the edge portion of the second protective net (32) on both sides of the infiltration ditch (2) to fix the second protective net (32).

9. The river rainwater infiltration system according to any one of claims 1 to 6, characterized in that, The filter assembly (3) includes filter media particles (33) with microorganisms attached to the surface of the filter media particles (33).

10. The river rainwater infiltration system according to claim 9, characterized in that, The particle size of the filter media (33) is greater than or equal to 8 mm and less than or equal to 25 mm.

Images