Modularized treatment equipment for treating runoff of highway bridge floor

Abstract

The utility model discloses modular treatment equipment for treating runoff of a bridge floor of an expressway. The modular treatment equipment comprises a modular filter bed and a carrier, according to the modular treatment equipment for treating the runoff of the highway bridge floor, module filter beds in the same column are connected in series to form filter bed chains, the filter bed chains are connected in parallel to form a filter bed group, the module filter beds purify various pollutants at the same time, and the purification efficiency is high; the removal mechanism of the pollutants is that electrons generated by the reaction of the Fe-C primary battery in the multi-element catalytic composite carrier are combined with the pollutants under the action of the catalyst to generate corresponding chemical reaction so as to remove the pollutants. Theoretically, the module filter bed in a liquid state has a good treatment effect, so that the module filter bed is high in weather resistance and resistant to hydraulic impact; the module filter bed only needs to supplement part of lost carriers at regular time; water flowing and emptying of the module filter bed are achieved by means of gravity flow, no power is needed, the operation and maintenance problems such as repair and maintenance of movable equipment are avoided, and therefore the maintenance cost is extremely low.

Description

Technical Field

[0001] This utility model relates to the field of road and bridge surface runoff treatment technology, specifically a modular treatment device for treating runoff from highway bridge surfaces. Background Technology

[0002] During highway operation, road surface and bridge surface runoff will cause pollution. The main pollutants are spillage from the bridge surface, particulate matter from vehicle exhaust falling on the road surface, fuel dripping from the bridge surface, and wear and tear from tires and road surface. Harmful substances from vehicle exhaust and atmospheric particulate matter settle on the road surface. As the road surface and tires wear down, they are washed into surrounding farmland, ditches and grasslands by rain, polluting some water areas near the highway.

[0003] In frigid regions, the use of de-icing agents after snowfall in winter causes large amounts of inorganic salts to enter water bodies or roadside soil, resulting in a decline in the water quality of rivers, lakes, and reservoirs. Once this damage and pollution to water resources along highways occurs, it is very difficult to restore.

[0004] Currently, the types of oil-water separation sedimentation tanks used in domestic highways are largely similar, such as... Figure 7 As shown, the design of the oil-water separation sedimentation tank is primarily based on fulfilling basic functional requirements, fully considering six major functions: water inlet, energy dissipation, oil separation, sedimentation, adsorption, and drainage. The tank is divided into three spaces, forming a three-stage sedimentation tank. These three stages consist of an energy dissipation tank, a sedimentation tank, and a clear water tank, separated by partition walls. Rainwater from the bridge surface continuously overflows into the second and third stages. When the second and third stages are full, the runoff is directly discharged through the horizontal flow layer formed by the guide holes. After a period of sedimentation, the water in the first, second, and third stages is discharged into the empty tanks through the lower drainage holes. The advantages of this technology are its simple tank structure, ease of operation, and automatic overflow of runoff, eliminating the need for personnel on-site supervision. Only periodic emptying and inspection are required, achieving a significant treatment effect with a relatively small investment.

[0005] The combination of regulating ponds and constructed wetlands is a common ecological engineering technology, such as... Figure 8 and Figure 9As shown, a regulating pond is typically a large mixing pond, used for the initial sedimentation of particles, sediment, and other substances in the initial runoff, and for balancing pollutants in the preceding and subsequent initial runoff. An artificial wetland is a constructed wetland system that simulates a natural wetland, usually composed of multiple layers, including a surface vegetation zone, a root zone, and a bottom sediment layer. Each layer has different functions, such as adsorption, decomposition, and sedimentation. Artificial wetlands primarily purify the initial runoff through the combined action of artificial substrates, aquatic plants, and microorganisms. The artificial substrate provides a stable surface for microbial growth, a carrier and nutrients for aquatic plants, and purifies the initial runoff through physical and chemical pathways. Aquatic plants mainly absorb and utilize nutrients from the initial runoff and adsorb and enrich some toxic and harmful substances. Microbial metabolism is the main mechanism for the degradation of organic pollutants in the initial runoff. Wastewater can flow through the gaps in the artificial substrate or on the surface of the bed, where aquatic plants with good initial runoff treatment capabilities, high survival rates, strong water resistance, long growth cycles, aesthetic appeal, and economic value are planted. When wastewater flows through, solids are intercepted and retained by the artificial substrate and plant roots, while organic matter is removed through adsorption, assimilation, and dissimilation via the biofilm. Due to the oxygen transfer and release by wetland plant roots, the microenvironment of the wetland bed and its surroundings sequentially exhibits aerobic, anoxic, and anaerobic states, which is conducive to nitrification, denitrification, and the excessive accumulation of phosphorus by microorganisms, achieving nitrogen and phosphorus removal. Finally, the pollutants are removed from the system through regular replacement of the wetland substrate or harvesting of plants. Generally, insoluble organic matter in the initial runoff can be quickly intercepted and utilized by microorganisms through sedimentation and filtration in the wetland; soluble organic matter in the initial runoff can be decomposed and removed through adsorption, absorption, and biodegradation processes via the plant root biofilm. The conventional approach to constructed wetlands involves digging a pond on the ground, constructing a stable bottom structure system that includes layers of compacted soil, gravel, humus, and silt. One to three horizontal gravel dams are then installed within the pond to separate the water and trap sediment. Aquatic plants, algae, and microorganisms are planted in the pond. The combination of a regulating pond and constructed wetlands can be used to treat runoff, primarily utilizing plant growth to absorb pollutants. It is particularly effective at treating soluble phosphorus and nitrogen. However, it has virtually no effect on removing insoluble pollutants.

[0006] Oil separators are simple in structure and can only treat initial runoff to a limited extent. They can only intercept larger impurities such as fallen leaves, sticks, and stones, as well as sedimentable suspended solids such as suspended particulate matter (SS). However, their ability to treat dissolved substances such as lead, petroleum, and heavy metals is limited. The treated runoff can meet the environmental impact assessment requirement of "not being allowed to be directly discharged." However, if it is discharged into the drinking water source protection area, the water quality will still have a certain degree of pollution.

[0007] The disadvantages of using a regulating pond combined with an artificial wetland are that plants are selective in removing pollutants, and the treatment effect is greatly affected by plant growth; moreover, the plants require a lot of manual maintenance, and the filter media filled in the wetland needs to be turned over and replaced regularly, resulting in high operating costs in the later stages.

[0008] In summary, a modular treatment device for treating runoff from highway bridge decks is proposed, aiming to provide a technology with low operation and maintenance costs, all-weather operation, and the ability to simultaneously treat multiple pollutants to manage bridge deck runoff. Utility Model Content

[0009] The purpose of this invention is to provide a modular processing device for treating runoff from highway bridge decks, in order to solve the problems mentioned in the background art.

[0010] To achieve the above objectives, this utility model provides the following technical solution:

[0011] A modular treatment device for handling runoff from highway bridge decks includes a raft foundation installed on the slope at the bottom of the bridge. The raft foundation array contains multiple modular filter beds. Filter beds in the same row are connected in series to form filter bed chains, and filter bed chains are connected in parallel to form filter bed groups. Each modular filter bed includes a bottom plate, an outer plate, a top plate, partitions, a carrier, supporting grates, and supporting corners. The outer plate is fixedly connected to the inner side of the bottom plate, and the top plate is fixedly connected to the top surface of the outer plate. Partitions are fixedly connected to the interior of the chamber formed by the bottom plate, outer plate, and top plate. Three partitions divide the chamber into four compartments. The bottom edge of the middle partition is fixedly connected to the bottom plate, and a flow gap is provided between its top edge and the top plate. The top edges of the side partitions are fixedly connected to the top plate, and flow gaps are provided between their bottom edges and the bottom plate. Each chamber is filled with a carrier, which is placed on a support grate. The support grate is made of fiberglass and has a size of 1000mm×500mm. The support grate is placed on a support corner, which has a size greater than 80mm×80mm. The support corner is set at the four corners of the support grate and is fixedly connected to the four corners inside the chamber. The upper two sides of the outer plate are respectively fixedly connected to the upper part of the carrier. The inlet pipe and outlet pipe of two adjacent module filter beds on the filter bed chain are connected by a first connecting pipe (31). The inlet pipes of the module filter beds at the front end of the filter bed chain are connected to a diversion pipe. The outlet pipes of the module filter beds at the tail end of the filter bed chain are connected to a first confluence pipe. The tail end of the first confluence pipe corresponds to a drainage channel.

[0012] As a further embodiment of this utility model: an overflow weir is fixedly connected to the inner side of the outer plate corresponding to the end of the water inlet pipe, and an overflow weir is also fixedly connected to the top edge of the middle partition plate on the side close to the water outlet pipe.

[0013] As a further improvement of this utility model: Each compartment has an inspection port on the top plate, and each inspection port is covered with a matching inspection door. The inspection door must be securely sealed and cannot be opened without specialized tools. This prevents villagers near the equipment from opening it arbitrarily.

[0014] As a further embodiment of this utility model: a slow-flow inlet and a slow-flow outlet are fixedly connected to the bottom sides of the outer plate corresponding to the lower part of the carrier, and a second connecting pipe is fixedly connected between the slow-flow inlet and slow-flow outlet of two adjacent module filter beds on the filter bed chain.

[0015] As a further embodiment of this utility model: the slow-flow inlets of the modular filter beds at the front end of the filter bed chain are all fixedly connected to blind plates, and the slow-flow outlets of the modular filter beds at the rear end of the filter bed chain are all connected to a second manifold. A valve is installed on the slow-flow outlet of the modular filter bed at the rear end of the filter bed chain, and the valve can be used to adjust the water flow rate. The rear end of the second manifold corresponds to the drainage ditch.

[0016] As a further improvement of this utility model: the top four corners of the outer plate are fixedly connected with lifting lugs, the lower part of the outer plate is provided with reinforcing inner ribs, and the bottom plate is provided with fixing holes.

[0017] As a further embodiment of this utility model: the port of the slow-flow outlet extends into the module filter bed and is fixedly connected to a throttling pipe. The front end of the throttling pipe is bent downwards, and a throttling pipe is also fixedly connected through the bottom of the middle partition plate. The throttling pipes are flush with each other.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. The modular filter bed in this invention simultaneously purifies multiple pollutants with high purification efficiency. The pollutant removal mechanism involves electrons generated by the Fe-C galvanic cell reaction in the multi-element catalytic composite carrier combining with the pollutants under the action of the catalyst, resulting in a corresponding chemical reaction that removes the pollutants. Therefore, theoretically, the modular filter bed has good treatment effect as long as it is in a liquid state, thus exhibiting strong weather resistance and resistance to hydraulic shock. The modular filter bed only requires periodic replenishment of the carrier that is lost. The water flow and drainage of the modular filter bed are achieved by gravity flow, requiring no power and eliminating maintenance issues such as the repair and maintenance of moving equipment, resulting in extremely low maintenance costs.

[0020] 2. This utility model adopts a modular design, which can be flexibly combined and is not limited by the site. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a modular treatment device for handling runoff from highway bridge decks.

[0022] Figure 2 This is a diagram showing the arrangement of modular filter beds in a modular treatment device for treating runoff from highway bridge decks.

[0023] Figure 3 This is a parallel connection diagram of filter bed groups in a modular treatment device for treating runoff from highway bridge decks.

[0024] Figure 4 This is a front view of a modular filter bed in a modular treatment device for treating runoff from highway bridge decks.

[0025] Figure 5 This is a top view of a modular filter bed in a modular treatment device for treating runoff from highway bridge decks.

[0026] Figure 6 This is a side view of a modular filter bed in a modular treatment device for treating runoff from highway bridge decks.

[0027] Figure 7 This is an internal view of the modular filter bed in a modular treatment device for treating runoff from highway bridge decks.

[0028] Figure 8 This is a schematic diagram of fluid flow in a modular filter bed of a modular treatment device for treating runoff from highway bridge decks.

[0029] Figure 9 This is a schematic diagram of a filter bed chain in a modular treatment device for treating runoff from highway bridge decks.

[0030] Figure 10 The first illustration is shown in Embodiment 2 of a modular treatment device for treating runoff from highway bridge decks.

[0031] Figure 11 This is the second illustration of an embodiment of a modular treatment device for treating runoff from highway bridge decks.

[0032] In the diagram: 1. Bridge body; 2. Hillside; 3. Raft foundation; 4. Modular filter bed; 5. Filter bed chain; 6. Filter bed assembly; 7. Bottom plate; 8. Outer plate; 9. Top plate; 10. Partition plate; 11. Carrier; 12. Support grate; 13. Support angle; 14. Inlet pipe; 15. Outlet pipe; 16. Overflow weir; 17. Diversion pipe; 18. First confluence pipe; 19. Drainage ditch; 20. Inspection door; 21. Slow-flow inlet; 22. Slow-flow outlet; 23. Second connecting pipe; 24. Blind flange; 25. Second confluence pipe; 26. Lifting lug; 27. Reinforcing rib; 28. Throttling pipe; 29. ​​Fixing hole; 30. Valve; 31. First connecting pipe. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Please see Figures 1-9 In this embodiment of the invention, a modular treatment device for treating runoff from a highway bridge deck includes a raft foundation 3 installed on the slope 2 at the bottom of the bridge body 1. The modular filter beds 4 are also based on the raft foundation 3. A stepped arrangement can also be used depending on site conditions, making it highly adaptable to different locations. Multiple modular filter beds 4 are arrayed on the raft foundation 3. The modular filter beds 4 are modularly designed, with each module being 3-6m long, 1-3m wide, and 1-3m high. They can be combined according to the inflow volume. Filter bed modules 4 are connected in series to form filter bed chains 5, and filter bed chains 5 are connected in parallel to form filter bed groups 6. Each filter bed 4 includes a base plate 7, an outer plate 8, a top plate 9, partitions 10, a carrier 11, support grates 12, and support corners 13. The outer plate 8 is fixedly connected to the inner side of the base plate 7, and the top plate 9 is fixedly connected to the top surface of the outer plate 8. Partitions 10 are fixedly connected to the interior of the chamber formed by the base plate 7, outer plate 8, and top plate 9. There are three partitions 10, dividing the chamber into four compartments. The bottom edge of the middle partition 10 is fixedly connected to the base plate 7, and a flow gap is provided between its top edge and the top plate 9. The top edges of the two side partitions 10 are fixedly connected to the top plate 9, and a flow gap is provided between their bottom edges and the base plate 7. Each compartment is filled with a carrier 11, which is placed on the support grates 12. The support grates 12 are constructed using... Made of fiberglass, with dimensions of 1000mm×500mm, the support grate 12 is placed on the support corner 13, the size of the support corner 13 is greater than 80mm×80mm, the support corner 13 is set at the four corners of the support grate 12, and the support corner 13 is fixedly connected to the four corners inside the cabin. The upper two sides of the outer plate 8 are respectively fixedly connected to the upper part of the carrier 11 with water inlet pipe 14 and water outlet pipe 15. The water inlet pipe 14 and water outlet pipe 15 of the two adjacent module filter beds 4 on the filter bed chain 5 are connected by the first connecting pipe (31). The water inlet pipe 14 on the module filter bed 4 at the front end of the filter bed chain 5 is connected to the diversion pipe 17. The water outlet pipe 15 on the module filter bed 4 at the tail end of the filter bed chain 5 is connected to the first confluence pipe 18. The tail end of the first confluence pipe 18 corresponds to the drainage channel 19.

[0035] An overflow weir 16 is fixedly connected to the inner side of the outer plate 8 corresponding to the end of the water inlet pipe 14, and an overflow weir 16 is also fixedly connected to the top edge of the middle partition plate 10 on the side close to the water outlet pipe 15.

[0036] Each compartment has an access panel on the top plate 9, and each access panel is covered with a corresponding access door 20. The access door 20 must be securely sealed and cannot be opened without professional tools to prevent villagers near the equipment from opening it at will.

[0037] The bottom sides of the outer plate 8 are respectively fixedly connected to the slow-flow inlet 21 and the slow-flow outlet 22 below the carrier 11. The slow-flow inlet 21 and the slow-flow outlet 22 of the two adjacent module filter beds 4 on the filter bed chain 5 are fixedly connected to a second connecting pipe 23.

[0038] The slow-flow inlets 21 on the module filter bed 4 at the front end of the filter bed chain 5 are all fixedly connected to blind plates 24. The slow-flow outlets 22 on the module filter bed 4 at the rear end of the filter bed chain 5 are all connected to a second manifold 25. A valve 30 is installed on the slow-flow outlet 22 on the module filter bed 4 at the rear end of the filter bed chain 5. The valve 30 can be used to adjust the water flow rate. The rear end of the second manifold 25 corresponds to the drainage ditch 19.

[0039] The top four corners of the outer plate 8 are fixedly connected with lifting lugs 26, the lower part of the outer plate 8 is provided with reinforcing inner ribs 27, and the bottom plate 7 is provided with fixing holes 29.

[0040] The port of the slow-flow outlet 22 extends into the module filter bed 4 and is fixedly connected to a throttling pipe 28. The front end of the throttling pipe 28 is bent downwards, and the bottom of the middle partition 10 is also fixedly connected to a throttling pipe 28. The throttling pipes 28 are flush with each other.

[0041] The pollutant removal mechanism of multi-component catalytic composite carriers includes:

[0042] 1) Micro-region electrocatalysis generates highly oxidizing free radicals: Due to the different electrode reactions of different phase regions in water, a micro-region potential difference is formed on the surface of the multi-component catalytic composite support. The Fe3C region is the anode region, mainly characterized by the loss of electrons by iron and other components; the C region is the cathode region, mainly characterized by the gain of electrons by hydrogen ions and other components under anaerobic acidic conditions, while oxygen reduction occurs in the presence of oxygen in neutral or alkaline environments; various highly oxidizing free radicals are generated near the surface of the micro-region electrode under the action of an electric field.

[0043] The formation mechanism of anodic (Fe3C) free radicals

[0044] Fe-2e→Fe 2+ E(Fe / Fe 2+ ) = 0.44V

[0045] Cathode (C) H2O→OH·+H + +e -

[0046] 2H + +2e→2[H]→H2E(H+ / H2)=0.00V O2+2H + +2e - →H2O2

[0047] Cathodic reaction under aeration conditions

[0048] O2+4H + +4e→2H2O E(O2 / H2O)=+1.23V (acidic) H2O2+e - →OH - +OH·

[0049] O2 + 2H + +2e→2H₂O 2E(O₂ / H₂O₂)=+0.68V (acidic) H₂O₂→2OH⁻

[0050] O₂ + 2H₂O + 4e⁻ → 4OH⁻ - E(O2 / OH - )=+0.40V (neutral, weakly alkaline) H2O2+Fe 2+ +H + →Fe 3+ +OH·+H2O

[0051] 2) Electrocatalytic oxidation (advanced oxidation) for COD removal: Free radicals such as OH· generated near the surface of the micro-electrode create a strong redox reaction environment in different regions near the carrier surface, which can efficiently decompose COD in water into CO2 and H2O and release energy.

[0052] Free radical chain reaction: Overall COD removal reaction:

[0053]

[0054] 3) Catalytic oxidation-autotrophic denitrification coupled denitrification: The reduction of oxygen creates a slightly alkaline microenvironment in the carrier pores, providing a suitable environment for the activity of nitrifying and denitrifying bacteria. After a certain period of cultivation, a stable denitrification reaction system coupled with electrocatalytic oxidation and heterotrophic autotrophic denitrification is formed. The porous carrier provides a large space for denitrification, improving the nitrogen removal efficiency.

[0055]

[0056] 4) Micro-electrolysis-catalytic oxidation-precipitation phosphorus removal: The ferrous iron produced by micro-electrolysis of a small amount of iron is further oxidized to ferric iron, and then reacts with phosphate ions to remove phosphorus. The product, iron phosphate, serves as a catalyst for advanced oxidation to supplement the catalytic oxidation capacity of the system.

[0057] Fe→Fe 2+ +2e

[0058] Fe 2+ -e→Fe 3+

[0059] Fe 3+ +PO4 3- +2H₂O→FePO₄·2H₂O↓

[0060] 5) Mechanism of heavy metal removal

[0061] Heavy metals carried in runoff are mainly removed by adsorption on the surface of a multi-component catalytic composite support. Most heavy metals are themselves important components of the catalyst, and the solidification of heavy metals plays a positive role in the removal of pollutants from the support.

[0062] Example 1:

[0063] Please see Figure 1 The initial rainwater (containing various pollutants) collected by the rainwater pipes on the bridge deck is directly fed into the diversion pipe 17 connected to the filter bed group 6 through the rainwater pipes or collection pool, taking advantage of the terrain elevation difference, thereby carrying out water treatment.

[0064] Example 2:

[0065] Please see Figures 10-11 The initial rainwater (containing various pollutants) collected by the rainwater pipe of bridge body 1 is discharged into the collection pool. The rainwater in the collection pool is pumped into the diversion pipe 17 connected to the filter bed group 6 by a water pump, thereby carrying out water treatment.

[0066] The working principle of this utility model is as follows:

[0067] In use, wastewater enters the modular filter bed 4 and is evenly distributed within the first-stage treatment unit of the modular filter bed 4 through the overflow weir. The wastewater flows evenly from the top of the first unit through the multi-component catalytic composite carrier 11. Then it flows upward through the second unit, contacting the multi-component catalytic composite carrier 11 in the second unit; and so on.

[0068] Each treatment unit is filled with various types and specifications of multi-component catalytic composite carriers 11, which degrade various pollutants carried in the runoff through physical and electrochemical actions. The purified water overflows into the clear water tank and is discharged through the outlet pipe 15. The treated water quality meets national standards and local standards for the project location.

[0069] The modular filter bed 4 has a specially designed throttling pipe 28 at its bottom, which discharges water from the modular filter bed 4 according to the set flow rate, emptying the modular filter bed 4 to prepare for the next rainfall. The modular filter bed 4 system relies on gravity flow and has no power equipment, requiring no power supply.

[0070] Modular filter bed 4 is generally installed under bridges, within the highway right-of-way. The elevation of modular filter bed 4 is set according to the elevation of the rainwater collection pipe, and it can be installed above ground or underground. A drainage ditch 19 is installed outside the outlet of modular filter bed 4 for external discharge according to the actual site conditions.

[0071] The mechanism by which the modular filter bed 4 removes pollutants is that the electrons generated by the Fe-C galvanic cell reaction in the multi-element catalytic composite support combine with the pollutants under the action of the catalyst, resulting in a corresponding chemical reaction that removes the pollutants.

[0072] The multi-element catalytic composite support 11 is the core material of the module filter bed 4. It is formed by fusing multiple catalysts with multiple metals through high-temperature smelting to form an integrated multi-element alloy skeleton (Fe3C-C-based), ensuring the continuous and efficient iron-carbon (Fe-C) "galvanic cell" effect.

[0073] The microporous structure provides a large specific surface area and uniform water and air flow channels, offering greater current density and better catalytic reaction effects for runoff treatment. It is highly active, lightweight, non-passivating, non-caking, has a fast reaction rate, and is stable and effective in long-term operation. Adjusting the proportion of catalytic components for different runoff types improves reaction efficiency and expands the application range for runoff treatment. This packing material has a large specific surface area and high porosity, exhibiting strong adsorption and biocompatibility, which is conducive to the proliferation and metabolism of microorganisms on this packing material, promoting the formation of microbial communities and facilitating coupling with biochemical processes for better treatment results. The multi-element catalytic composite carrier can remove pollutants such as organic matter, suspended solids, ammonia nitrogen, nitrate nitrogen, heavy metals, and algae from the initial runoff on bridge surfaces through physicochemical catalytic reactions and microbial metabolism, while inhibiting odor generation and preventing algae proliferation in ponds. The ecological filter bed process can remove pollutants from incoming water without the need for any added chemicals. The multi-element catalytic composite carrier does not caking and requires no addition for ten years. Experimental results are as follows:

[0074] Unit: mg / L

[0075] Project Name SS COD ammonia nitrogen Total nitrogen Total phosphorus Total cadmium Total Chromium Total lead Inlet water indicators 500 200 50 80 10 0.2 2 1.5 Water discharge indicators 10 40 3 12 0.4 0.01 0.1 0.1

[0076] The modular filter bed 4 and the multi-element catalytic composite carrier can be used in water temperatures of 0-50℃; no chemicals need to be added during the initial runoff treatment process on the bridge deck.

[0077] Modular filter bed 4 simultaneously purifies multiple pollutants, including COD, ammonia nitrogen, total nitrogen, total phosphorus, and heavy metals, with high purification efficiency. The pollutant removal mechanism involves electrons generated by the Fe-C galvanic cell reaction in the multi-element catalytic composite carrier combining with pollutants under the action of the catalyst, resulting in a corresponding chemical reaction that removes the pollutants. Therefore, theoretically, any liquid-state ecological filter bed will have good treatment effects, thus exhibiting strong weather resistance and resistance to hydraulic shock. Under normal circumstances, the carrier filled in modular filter bed 4 is lost by about 5% every 10 years, and in actual use, the lost carrier only needs to be replenished every 10 years. The water flow and drainage of modular filter bed 4 are achieved by gravity flow, requiring no power and eliminating maintenance issues such as the repair and maintenance of moving equipment, resulting in extremely low maintenance costs.

[0078] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A modular treatment device for treating runoff from a highway bridge deck, comprising a raft foundation (3) installed on the slope (2) at the bottom of the bridge body (1), characterized in that: The raft foundation (3) array is provided with multiple modular filter beds (4). The modular filter beds (4) in the same row are connected in series to form a filter bed chain (5). The filter bed chains (5) are connected in parallel to form a filter bed group (6). The modular filter bed (4) includes a bottom plate (7), an outer plate (8), a top plate (9), a partition (10), a carrier (11), a support grate (12), and a support corner (13). The outer plate (8) is fixedly connected to the inner side of the bottom plate (7), and the top plate (9) is fixedly connected to the inner side of the bottom plate (7). The partition (10) is fixedly connected to the top surface of the outer plate (8). The partition (10) is fixedly connected to the interior of the cavity formed by the bottom plate (7), the outer plate (8), and the top plate (9). There are three partitions (10) that divide the cavity into four compartments. The bottom edge of the middle partition (10) is fixedly connected to the bottom plate (7), and there is a flow gap between the top edge and the top plate (9). The top edges of the two side partitions (10) are fixedly connected to the top plate (9), and there is a flow gap between the bottom edges and the bottom plate (7). Each chamber is filled with a carrier (11), which is placed on a support grate (12). The support grate (12) is placed on a support corner (13), which is set at the four corners of the support grate (12). The support corner (13) is fixedly connected to the four corners inside the chamber. The upper sides of the outer plate (8) are fixedly connected to the upper parts of the carrier (11) with an inlet pipe (14) and an outlet pipe (15), respectively. The filter bed chain ( The inlet pipe (14) and outlet pipe (15) of two adjacent modular filter beds (4) on the filter bed chain (5) are connected by a first connecting pipe (31). The inlet pipe (14) on the modular filter bed (4) at the front end of the filter bed chain (5) is connected to a branch pipe (17). The outlet pipe (15) on the modular filter bed (4) at the tail end of the filter bed chain (5) is connected to a first confluence pipe (18). The tail end of the first confluence pipe (18) corresponds to a drainage ditch (19).

2. The modular treatment equipment for treating runoff from highway bridge decks according to claim 1, characterized in that: An overflow weir (16) is fixedly connected to the inner side of the outer plate (8) corresponding to the end of the water inlet pipe (14), and an overflow weir (16) is also fixedly connected to the top edge of the middle partition plate (10) on the side close to the water outlet pipe (15).

3. The modular treatment equipment for treating runoff from highway bridge decks according to claim 1, characterized in that: Each compartment has an access port on the top plate (9), and each access port is covered with a corresponding access door (20).

4. The modular treatment equipment for treating runoff from highway bridge decks according to claim 1, characterized in that: The bottom sides of the outer plate (8) are respectively fixedly connected to the lower part of the carrier (11) with a slow-flow inlet (21) and a slow-flow outlet (22). The slow-flow inlet (21) and slow-flow outlet (22) of two adjacent module filter beds (4) on the filter bed chain (5) are fixedly connected to a second connecting pipe (23).

5. A modular treatment device for treating runoff from highway bridge decks according to claim 4, characterized in that: The slow-flow inlets (21) on the module filter bed (4) at the front end of the filter bed chain (5) are all fixedly connected to blind plates (24). The slow-flow outlets (22) on the module filter bed (4) at the tail end of the filter bed chain (5) are all connected to a second manifold (25). A valve (30) is installed on the slow-flow outlet (22) on the module filter bed (4) at the tail end of the filter bed chain (5). The tail end of the second manifold (25) corresponds to the drainage ditch (19).

6. The modular treatment equipment for treating runoff from highway bridge decks according to claim 1, characterized in that: The top four corners of the outer plate (8) are fixedly connected with lifting lugs (26), the lower part of the outer plate (8) is provided with reinforcing inner ribs (27), and the bottom plate (7) is provided with fixing holes (29).

7. A modular treatment device for treating runoff from highway bridge decks according to claim 4, characterized in that: The port of the slow-flow outlet (22) extends into the module filter bed (4) and is fixedly connected to a throttling pipe (28). The front end of the throttling pipe (28) is bent downwards, and the bottom of the middle partition (10) is also fixedly connected to a throttling pipe (28). The throttling pipes (28) are flush with each other.

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