A system and method for treating phosphorus pollution in a watershed water body

Abstract

The application discloses a kind of phosphorus pollution treatment system and method in river basin water body, system includes multiple pollution treatment units arranged in cross along the direction of water flow in river course two sides, each pollution treatment unit includes a treatment flow channel and is arranged in the pollution sedimentation mechanism of treatment flow channel upstream end, multiple flow partition walls that are arranged perpendicularly to flow direction are fixed in treatment flow channel, and flow partition wall is separated into multiple plant cultivation pool and multiple pollution filter pool in treatment flow channel;Plant cultivation pool is equipped with plant purification mechanism, and pollution filter pool is equipped with pollution filter mechanism;Plant purification mechanism includes the plant support plate that can be moved along vertical direction and is arranged in plant cultivation pool, and multiple plant fixing holes are arranged on plant support plate, and purification adsorption plant is arranged in plant fixing hole;The treatment system breaks single treatment mode, constructs the whole-process phosphorus interception system of pretreatment, plant purification, physical filtration, depth adsorption, and removal efficiency is significantly improved.

Description

Technical Field

[0001] This invention relates to the field of water pollution control technology, specifically to a system and method for treating phosphorus pollution in water bodies. Background Technology

[0002] Phosphorus pollution in watersheds refers to the excessive input of phosphorus into a watershed (a complete hydrological unit consisting of rivers, lakes, reservoirs, groundwater, and surrounding land) due to anthropogenic or natural factors, exceeding the water body's self-purification capacity, and thus causing eutrophication and disrupting the balance of aquatic ecosystems. It is one of the core issues in global watershed water pollution control, and its harm extends beyond water quality deterioration, also having a cascading impact on water resource utilization, fisheries production, and human health.

[0003] Phosphorus is an essential nutrient for life in the natural environment, but high-intensity human activities are the root cause of pollution, which can be divided into two categories: "point source pollution" and "non-point source pollution". However, the current technology has a low removal rate of phosphorus pollution in water bodies and needs further improvement and optimization. Summary of the Invention

[0004] The purpose of this invention is to provide a phosphorus pollution control system and method for water bodies, which utilizes graded interception combined with precise targeting to achieve phosphorus removal across the entire chain.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A phosphorus pollution control system for a watershed includes multiple pollution control units arranged crisscrossingly on both sides of a river channel along the direction of water flow. Each pollution control unit includes a treatment flow channel and a pollution sedimentation mechanism located at the upstream end of the treatment flow channel. Multiple flow partition walls are fixed in the treatment flow channel and arranged perpendicular to the flow direction. The flow partition walls divide the treatment flow channel into multiple plant cultivation ponds and multiple pollution filtration ponds.

[0007] The plant cultivation pool is equipped with a plant purification mechanism, and the pollution filtration pool is equipped with a pollution filtration mechanism.

[0008] The plant purification mechanism includes a plant support plate that is set in the plant cultivation pool and can move vertically. The plant support plate has multiple vertically penetrating plant fixing holes. Plant restraint columns are inserted into the plant fixing holes. The plant restraint columns have vertically penetrating plant restraint holes. Purifying and adsorbing plants are planted in the plant restraint holes.

[0009] The drainage channel is located next to the river, and its flow direction is consistent with that of the river. The upstream end of the drainage channel is connected to the river interior through the upstream drainage channel, and the downstream end of the drainage channel is connected to the river interior through the downstream drainage channel.

[0010] Preferably, each end of the plant support plate has a vertically penetrating lifting connection hole, and a lifting drive ring is rotatably connected in the lifting connection hole. Two vertically extending lifting mating columns are fixed in the plant cultivation pool. The outer side of the lifting mating column has external threads, and the inner side of the lifting drive ring has internal threads. The lifting mating columns are connected to the lifting drive ring in a one-to-one threaded transmission.

[0011] A lifting driven worm gear is fixed on the lifting drive ring, a lifting drive motor is fixed on the upper side of the plant support plate, a lifting drive worm is fixed on the output shaft of the lifting drive motor, and the lifting drive worm is meshed with the lifting driven worm gear.

[0012] The plant cultivation pool has multiple vertically extending guide constraint rods fixed inside, and the plant support plate has multiple vertically penetrating guide constraint holes. The guide constraint rods are slidably connected to each guide constraint hole in a corresponding manner.

[0013] Note: During the plant absorption and purification process, the height of the plant support plate can be adjusted by raising and lowering it, thereby adjusting the immersion depth of the plant roots.

[0014] Preferably, the contamination filtration mechanism includes a matrix filtration containment shell, a middle layer filtration containment shell, and a fine filtration containment shell arranged sequentially from bottom to top in the contamination filtration tank.

[0015] The top and bottom of the matrix filter housing, the middle filter housing, and the fine filter housing are all porous hollow structures that run vertically inside and out. The inner walls of the matrix filter housing, the middle filter housing, and the fine filter housing are all covered with a layer of non-woven fabric.

[0016] The matrix filter housing is filled with matrix filter media, the middle filter housing is filled with middle filter media, and the fine filter housing is filled with fine filter media.

[0017] Explanation: The three-layer filtration structure of the pollution filtration tank forms a gradient interception. The lower matrix packing first filters suspended impurities, while the porous structure of zeolite initially adsorbs phosphorus. The middle packing utilizes the reaction of calcium and iron ions in steel slag with phosphorus, combined with the adsorption properties of activated carbon, to enhance phosphorus removal. The upper fine packing, through the high specific surface area and chemical affinity of the modified material, deeply adsorbs residual trace amounts of dissolved phosphorus, and can even remove organic phosphorus that is difficult to treat by conventional methods.

[0018] Preferably, the contaminated filtration pool is connected to the plant cultivation pool on the upstream side through multiple filter input pipes, and the filter input pipes are set at the lower end of the flow partition wall. The contaminated filtration pool is connected to the plant cultivation pool on the downstream side through multiple filter output pipes, and the filter output pipes are fixed at the upper end of the flow partition wall.

[0019] The end of the filter output pipe that is in the contaminated filter tank is inserted into the fine filter media. The side wall of the end of the filter output pipe that is inside the fine filter media has multiple permeation holes that are connected inside and outside.

[0020] Explanation: After the water in the polluted filtration pond reaches the fine filter media, it enters the filter output pipe through the permeation holes and flows into the adjacent plant cultivation pond along the filter output pipe.

[0021] Preferably, the top of the polluted filtration tank is covered with a sealed top cover, and a negative pressure containment box is fixed on the top of the sealed top cover. A negative pressure tank and a negative pressure suction pump are fixed in the negative pressure containment box.

[0022] The input end of the negative pressure suction pump is connected to the inside of the negative pressure tank through a suction connecting pipe. The negative pressure tank is fixed with a negative pressure connecting pipe that is connected to its inside. The other end of the negative pressure connecting pipe extends into the inside of the polluted filtration tank.

[0023] The suction connecting pipe has a first control valve, and the negative pressure connecting pipe has a second control valve.

[0024] Explanation: In the filtration and purification process, creating a local negative pressure zone at the upper part of the polluted filter pool is beneficial for the upward flow and migration of water in the polluted filter pool. Under the action of negative pressure, local air can be reversed and enter the filter output pipe and then discharged through the permeation holes, which helps to maintain the patency of the permeation holes.

[0025] Preferably, a micro-aeration mechanism is provided at the bottom of the plant cultivation pool. The micro-aeration mechanism includes multiple aeration delivery pipes installed at the bottom of the plant cultivation pool, and multiple aeration nozzles connected to the inside of the aeration delivery pipes are provided on the upper side of the aeration delivery pipes.

[0026] An aeration drive housing is fixed on the outside of the treatment flow channel, and an air conveyor is fixed inside the aeration drive housing. The output end of the air conveyor is connected to each aeration conveying pipe through a pipeline.

[0027] Explanation: A micro-aeration mechanism is used to aerate the water in the plant cultivation pond to maintain the oxygen content required for purifying and adsorbing the plant roots.

[0028] Preferably, the contamination sedimentation mechanism includes a sedimentation flow channel, and multiple vertically extending agent delivery pipes are fixed in the sedimentation flow channel and near the upstream side. The agent delivery pipes have multiple agent nozzles connected to their interiors on their sides.

[0029] The downstream end of the sedimentation flow channel is connected to the upstream end of the treatment flow channel, and the upstream end of the sedimentation flow channel is connected to the upstream flow channel.

[0030] A sedimentation interception plate is placed at the bottom of the sedimentation flow channel, and multiple interception baffles with square wave-shaped extensions are fixed on the top of the sedimentation interception plate.

[0031] A reagent storage tank is fixed at the top of the sedimentation and flow channel. The reagent storage tank is equipped with a reagent delivery pump. The output end of the reagent delivery pump is connected to each reagent delivery pipe through a pipeline.

[0032] Explanation: By adding metal salts such as aluminum salts (Al2(SO4)3) and iron salts (FeCl3) through the pollution precipitation mechanism, they react with phosphate ions in the water to form insoluble precipitates such as AlPO4 and FePO4, which first intercept most of the particulate phosphorus and some of the dissolved phosphorus, reducing the load of subsequent treatment.

[0033] This invention also provides a method for treating phosphorus pollution in watersheds, based on the aforementioned phosphorus pollution treatment system for watersheds, comprising the following steps:

[0034] S1, Cluster Settings:

[0035] Set up 2 to 10 pollution control systems within the polluted river basin;

[0036] S2, Water sedimentation treatment:

[0037] In each pollution control system, the water in the river first enters the sedimentation channel through the upstream flow channel. The reagent storage tank contains aluminum sulfate solution, which is pumped to each reagent delivery pipe using a reagent delivery pump. The aluminum sulfate solution in the reagent delivery pipe is then discharged from the reagent nozzle and mixed with the water in the sedimentation channel. The aluminum sulfate solution reacts with phosphate ions in the water to form insoluble aluminum phosphate precipitate. The aluminum phosphate precipitate gradually falls to the top of the sedimentation interception plate under its own weight and is intercepted by the interception baffle for easy unified cleaning and recycling.

[0038] S3, Filtration and purification process:

[0039] The water discharged from the sedimentation and flow channel enters the treatment and flow channel, and the water first enters the polluted filtration pool through multiple filter input pipes;

[0040] The water flows from bottom to top in the polluted filtration tank, passing through each matrix filtration container, the middle layer filtration container, and the fine filtration container in sequence. The water is then filtered and purified by the matrix filtration packing, the middle layer filtration packing, and the fine filtration packing, respectively.

[0041] After the water reaches the fine filter media, it enters the filter output pipe through the permeation holes and flows into the adjacent plant cultivation pond along the filter output pipe.

[0042] S4. Plant absorption and purification:

[0043] After the water enters the plant cultivation pond, the roots of the purified and adsorbed plants are submerged in the water; the phosphorus element in the water is purified by the absorption of the plant roots in the form of soilless cultivation.

[0044] Each treatment channel has multiple pollution filtration ponds and plant cultivation ponds arranged alternately. The water in the plant cultivation ponds then enters the adjacent pollution filtration ponds downstream through multiple filter input pipes, repeatedly filtering and purifying the water and purifying it through plant absorption, gradually reducing the concentration of phosphorus pollution in the water.

[0045] Compared with the prior art, the beneficial effects of the present invention are reflected in the following aspects:

[0046] 1. The present invention has a reasonable structural design, combining graded interception with precise targeting to achieve full-chain phosphorus removal, breaking the single treatment mode and constructing a full-process phosphorus interception system of pretreatment, plant purification, physical filtration and deep adsorption. It can target phosphorus pollution of different forms and concentrations, and significantly improve the removal efficiency.

[0047] 2. This invention is easy to operate. It sets up a pre-precipitation pretreatment. Metal salts such as aluminum salt (Al2(SO4)3) and iron salt (FeCl3) are added through the pollution precipitation mechanism. They react with phosphate ions in the water to generate insoluble precipitates such as AlPO4 and FePO4. Most of the particulate phosphorus and some dissolved phosphorus are intercepted first, reducing the subsequent treatment load. At the same time, the zigzag interception baffles in the precipitation flow channel extend the water flow path and improve the precipitation efficiency.

[0048] 3. This invention allows the roots of aquatic plants such as reeds and cattails in the plant cultivation pond to directly absorb dissolved phosphorus, such as orthophosphate, from the water and convert it into nutrients needed for their own growth. It has both ecological restoration and landscape value. In addition, the plant fixing method of this invention avoids the roots from becoming messy and tangled, ensuring the stability of purification.

[0049] 4. This invention has the functions of multi-layer filtration and deep interception. The three-layer filtration structure of the pollution filtration pool forms a gradient interception. The lower matrix packing first filters suspended impurities, and at the same time, the porous structure of zeolite initially adsorbs phosphorus. The middle packing utilizes the reaction of calcium and iron ions in steel slag with phosphorus, combined with the adsorption properties of activated carbon, to enhance phosphorus removal. The upper fine packing uses the high specific surface area and chemical affinity of the modified material to deeply adsorb residual trace amounts of dissolved phosphorus, and can even remove organic phosphorus that is difficult to treat by conventional methods. Attached Figure Description

[0050] Figure 1 This is a top view of the overall layout of the present invention;

[0051] Figure 2 This is a front view of the channel for managing the flow of the present invention;

[0052] Figure 3 This is a left view of the drainage channel of the present invention;

[0053] Figure 4 This is a top view of the channel management system of this invention;

[0054] Figure 5 This is a schematic diagram of the plant constraint column of the present invention;

[0055] Figure 6 This is a top view of the lifting drive ring of the present invention;

[0056] Figure 7 This is a schematic diagram of the structure of the filter output tube of the present invention;

[0057] Figure 8 This is a schematic diagram of the negative pressure containment box of the present invention;

[0058] Figure 9 This is a front view of the pollution sedimentation mechanism of the present invention;

[0059] Figure 10 This is a left view of the contaminant sedimentation mechanism of the present invention;

[0060] Figure 11 This is a top view of the contamination sedimentation mechanism of the present invention.

[0061] In the diagram, 100-river channel, 10-treatment and circulation channel, 11-circulation partition wall, 101-plant cultivation pond, 102-pollution filtration pond, 20-plant purification mechanism, 21-plant support plate, 210-plant fixing hole, 22-plant restraint column, 220-plant restraint hole, 23-purification and adsorption plant, 241-lifting connection hole, 242-lifting drive ring, 243-lifting mating column, 244-lifting driven worm gear, 245-lifting drive motor, 246-lifting drive worm, 247-guide restraint rod, 248-guide restraint hole, 30-pollution filtration mechanism, 31-substrate filter housing, 310-substrate filter packing, 32-middle layer filter housing, 320-middle layer filter packing, 33-fine Fine filter housing, 330-fine filter packing, 341-filter input pipe, 342-filter output pipe, 3420-permeation orifice, 35-sealed top cover, 351-negative pressure housing, 352-negative pressure tank, 353-negative pressure suction pump, 354-suction connecting pipe, 3540-first control valve, 355-negative pressure connecting pipe, 3550-second control valve, 40-micro aeration mechanism, 41-aeration delivery pipe, 411-aeration nozzle, 42-aeration drive housing, 43-air conveyor, 50-contamination sedimentation mechanism, 51-sedimentation flow channel, 52-chemical delivery pipe, 521-chemical nozzle, 53-sedimentation interception plate, 531-intercepting baffle, 54-chemical storage tank, 541-chemical delivery pump. Detailed Implementation

[0062] The following is combined with Figures 1 to 11 The present invention will be described in detail. For ease of description, the orientations mentioned below are defined as follows: The directions of up, down, left, right, front, and back mentioned below are consistent with the directions of up, down, left, right, front, and back in the projection relationship of the respective main view or structural schematic diagram.

[0063] Example 1: A phosphorus pollution control system for watersheds, such as Figure 2 As shown, it includes multiple pollution control units arranged intersectingly on both sides of the river channel 100 along the direction of water flow. Each pollution control unit includes a treatment flow channel 10 and a pollution sedimentation mechanism 50 located at the upstream end of the treatment flow channel 10. Multiple flow partition walls 11 arranged perpendicular to the flow direction are fixed in the treatment flow channel 10. The flow partition walls 11 divide the treatment flow channel 10 into multiple plant cultivation ponds 101 and multiple pollution filtration ponds 102.

[0064] Multiple plant cultivation ponds 101 and multiple pollution filtration ponds 102 are arranged sequentially and at intervals along the flow direction of the treatment and circulation channel 10.

[0065] Each plant cultivation pool 101 has multiple fluorescent and electrochemical sensors (not shown in the figure) on its inner wall, which are existing technologies for detecting phosphorus pollution concentration.

[0066] like Figure 1 As shown, the treatment and flow channel 10 is set next to the river channel 100, and the flow direction of the treatment and flow channel 10 is consistent with the flow direction of the river channel 100. The upstream end of the treatment and flow channel 10 is connected to the interior of the river channel 100 through the upstream flow channel 1001, and the downstream end of the treatment and flow channel 10 is connected to the interior of the river channel 100 through the downstream flow channel 1002.

[0067] like Figure 2 As shown, the plant cultivation pool 101 is equipped with a plant purification mechanism 20, and the pollution filtration pool 102 is equipped with a pollution filtration mechanism 30.

[0068] like Figure 2 As shown, the plant purification mechanism 20 includes a plant support plate 21 disposed in the plant cultivation pool 101 and capable of moving vertically, such as... Figure 5 As shown, the plant support plate 21 has multiple vertically penetrating plant fixing holes 210, plant restraint posts 22 are inserted into the plant fixing holes 210, plant restraint posts 22 have vertically penetrating plant restraint holes 220, and purification and adsorption plants 23 are planted in the plant restraint holes 220.

[0069] The purifying and adsorbing plants include 23 species such as reeds and cattails;

[0070] like Figure 2As shown, the pollution filtration mechanism 30 includes a matrix filter housing 31, a middle layer filter housing 32 and a fine filter housing 33 arranged sequentially from bottom to top in the pollution filtration tank 102.

[0071] The top and bottom of the matrix filter housing 31, the middle filter housing 32 and the fine filter housing 33 are all porous hollow structures that run vertically inside and out. The inner walls of the matrix filter housing 31, the middle filter housing 32 and the fine filter housing 33 are all covered with a layer of non-woven fabric.

[0072] The matrix filter housing 31 is filled with matrix filter media 310, the middle layer filter housing 32 is filled with middle layer filter media 320, and the fine filter housing 33 is filled with fine filter media 330.

[0073] The matrix filter media 310 is composed of gravel, pebbles, quartz sand, and natural zeolite in a mass ratio of 3:2:1:1;

[0074] The middle layer filter media 320 is composed of steel slag and granular activated carbon in a mass ratio of 5:2.

[0075] The fine filter media 330 is composed of fly ash, iron-modified zeolite, clay, powdered activated carbon, nano Fe3O4, and nano TiO2 in a mass ratio of 10:5:3:2:1:1.

[0076] like Figure 2 As shown, the pollution filtration pool 102 is connected to the plant cultivation pool 101 on the upstream side through multiple filter input pipes 341. The filter input pipes 341 are set at the lower end of the flow partition wall 11. The pollution filtration pool 102 is connected to the plant cultivation pool 101 on the downstream side through multiple filter output pipes 342. The filter output pipes 342 are fixed at the upper end of the flow partition wall 11.

[0077] The end of the filter output pipe 342 in the polluted filter tank 102 is inserted into the fine filter packing 330. The side wall of the end of the filter output pipe 342 inside the fine filter packing 330 has multiple permeation holes 3420 that are interconnected inside and outside.

[0078] like Figure 9 As shown, the pollution sedimentation mechanism 50 includes a sedimentation flow channel 51, and a number of vertically extending agent delivery pipes 52 are fixed in the sedimentation flow channel 51 and near the upstream side. The agent delivery pipes 52 have a number of agent nozzles 521 connected to their interiors on their sides.

[0079] The downstream end of sedimentation flow channel 51 is connected to the upstream end of treatment flow channel 10, and the upstream end of sedimentation flow channel 51 is connected to upstream flow channel 1001.

[0080] The inner wall of the upstream end of the sedimentation flow channel 51 has multiple existing fluorescent and electrochemical sensors for detecting phosphorus pollution concentration, providing a basis for the dosage of reagents.

[0081] like Figure 11 As shown, a sedimentation interception plate 53 is placed at the bottom of the sedimentation flow channel 51, and multiple interception baffles 531 with square wave-shaped extensions are fixed on the top of the sedimentation interception plate 53.

[0082] like Figure 10 As shown, a reagent storage tank 54 is fixed at the top of the sedimentation flow channel 51. A reagent delivery pump 541 is installed in the reagent storage tank 54. The output end of the reagent delivery pump 541 is connected to each reagent delivery pipe 52 through a pipeline.

[0083] Metal salts, such as aluminum salts Al2(SO4)3, iron salts FeCl3, and calcium salts Ca(OH)2, are added to wastewater. These salts react with phosphate ions to form insoluble phosphate precipitates, such as AlPO4 and FePO4. Phosphorus pollutants are then removed through precipitation and filtration.

[0084] Example 2: This example describes a method for treating phosphorus pollution in a watershed, based on the phosphorus pollution treatment system in a watershed described in Example 1 above, including the following steps:

[0085] S1, Cluster Settings:

[0086] Set up 2 to 10 pollution control systems within 100 watersheds of the polluted river;

[0087] S2, Water sedimentation treatment:

[0088] In each pollution control system, the water in the river 100 first enters the sedimentation flow channel 51 through the upstream flow channel 1001. The agent storage tank 54 contains aluminum sulfate solution. The aluminum sulfate solution is pumped to each agent delivery pipe 52 by the agent delivery pump 541. The aluminum sulfate solution in the agent delivery pipe 52 is then discharged from the agent nozzle 521 and mixed with the water in the sedimentation flow channel 51. The aluminum sulfate solution reacts with the phosphate ions in the water to form insoluble aluminum phosphate precipitate. The aluminum phosphate precipitate gradually falls to the top of the sedimentation interception plate 53 under its own weight and is intercepted by the interception baffle 531 for unified cleaning and recycling.

[0089] S3, Filtration and purification process:

[0090] The water discharged from the sedimentation and flow channel 51 enters the treatment and flow channel 10. The water first enters the polluted filter pool 102 through multiple filter input pipes 341.

[0091] The water flows from bottom to top in the polluted filtration tank 102, passing through each matrix filtration container 31, middle layer filtration container 32 and fine filtration container 33 in sequence, and then the water is filtered and purified by the matrix filtration packing 310, middle layer filtration packing 320 and fine filtration packing 330 respectively.

[0092] After the water reaches the fine filter media 330, it enters the filter output pipe 342 through the permeation holes 3420 and flows into the adjacent plant cultivation pond 101 along the filter output pipe 342.

[0093] S4. Plant absorption and purification:

[0094] After the water enters the plant cultivation pond 101, the roots of the purification and adsorption plant 23 are submerged in the water; the phosphorus element in the water is purified by the absorption of the roots of the purification and adsorption plant 23 in the form of soilless cultivation.

[0095] Each treatment and circulation channel 10 has multiple pollution filtration pools 102 and plant cultivation pools 101 arranged alternately. The water in the plant cultivation pool 101 then enters the adjacent pollution filtration pool 102 downstream through multiple filter input pipes 341, repeatedly filtering and purifying the water and purifying it through plant absorption, thereby gradually reducing the concentration of phosphorus pollution in the water.

[0096] Example 3: Based on Example 1, such as Figure 2 As shown, the top of the contaminated filtration tank 102 is covered with a sealed top cover 35, and a negative pressure containment box 351 is fixed on the top of the sealed top cover 35. Figure 8 As shown, a negative pressure tank 352 and a negative pressure suction pump 353 are fixed in the negative pressure containment box 351;

[0097] like Figure 8 As shown, the input end of the negative pressure suction pump 353 is connected to the inside of the negative pressure tank 352 through the suction connecting pipe 354. The negative pressure tank 352 is fixed with a negative pressure connecting pipe 355 that is connected to its inside. The other end of the negative pressure connecting pipe 355 extends into the inside of the polluted filter pool 102.

[0098] The suction connecting pipe 354 has a first control valve 3540, and the negative pressure connecting pipe 355 has a second control valve 3550.

[0099] Example 4: This example describes a method for treating phosphorus pollution in a watershed, based on the phosphorus pollution treatment system in a watershed described in Example 3 above. The difference from Example 2 is that in step S3, during the filtration and purification process, a local negative pressure area is created at the upper end of the pollution filter pool 102. This facilitates the upward flow and migration of water in the pollution filter pool 102. Under the negative pressure, local air can enter the filter output pipe 342 in reverse and then be discharged through the permeation holes 3420, which helps to maintain the unobstructed flow of the permeation holes 3420.

[0100] The specific method is as follows: First, turn on the negative pressure suction pump 353 and the first control valve 3540. Use the negative pressure suction pump 353 to evacuate the negative pressure tank 352. After the air pressure in the negative pressure tank 352 is lower than 1% of the standard atmospheric pressure, turn off the negative pressure suction pump 353 and the first control valve 3540.

[0101] Next, the second control valve 3550 is opened. Under the negative pressure in the negative pressure tank 352, the air at the upper end of the polluted filter pool 102 will enter the negative pressure tank 352 through the negative pressure connecting pipe 355, so that a local negative pressure state is formed at the upper end of the polluted filter pool 102.

[0102] Example 5: Based on Example 4, such as Figure 4 As shown, the plant support plate 21 has a vertically penetrating lifting connection hole 241 at each end, as... Figure 6 As shown, a lifting drive ring 242 is rotatably connected in the lifting connection hole 241, and two vertically extending lifting mating columns 243 are fixed in the plant cultivation pool 101. The outer side of the lifting mating column 243 has external threads, and the inner side of the lifting drive ring 242 has internal threads. The lifting mating columns 243 are connected to the lifting drive ring 242 in a one-to-one threaded transmission.

[0103] A lifting driven worm gear 244 is fixed on the lifting drive ring 242, a lifting drive motor 245 is fixed on the upper side of the plant support plate 21, a lifting drive worm 246 is fixed on the output shaft of the lifting drive motor 245, and the lifting drive worm 246 is meshed with the lifting driven worm gear 244.

[0104] The lifting drive motor 245 is a servo motor of the prior art, and the two lifting drive motors 245 on each plant support plate 21 are controlled by signal synchronization to ensure that the two ends of the plant support plate 21 can move up and down synchronously.

[0105] Multiple vertically extending guide constraint rods 247 are fixed inside the plant cultivation pool 101. The plant support plate 21 has multiple vertically penetrating guide constraint holes 248. The guide constraint rods 247 are slidably connected to each guide constraint hole 248 in a corresponding manner.

[0106] Example 6: This example describes a method for treating phosphorus pollution in a watershed, based on the phosphorus pollution treatment system in a watershed in Example 5 above. The difference from Example 4 is that in step S4, during the plant absorption and purification process, the position and height of the plant support plate 21 are adjusted by raising and lowering, thereby adjusting the root immersion depth of the purification and adsorption plant 23.

[0107] The output shaft of the lifting drive motor 245 drives the lifting drive ring 242 to rotate through the meshing connection between the lifting drive worm 246 and the lifting driven worm wheel 244. Since the lifting drive ring 242 and the lifting mating column 243 are connected by a threaded transmission, the lifting drive ring 242 can also move along the axial direction of the lifting mating column 243 while rotating. The lifting drive ring 242 then drives the entire plant support plate 21 together with the purification and adsorption plants 23 to move up and down.

[0108] Example 7: Based on Example 5, such as Figure 3 As shown, a micro-aeration mechanism 40 is provided at the bottom of the plant cultivation pool 101. The micro-aeration mechanism 40 includes multiple aeration delivery pipes 41 located at the bottom of the plant cultivation pool 101. Multiple aeration nozzles 411 are connected to the upper side of the aeration delivery pipes 41.

[0109] An aeration drive housing 42 is fixed on the outside of the treatment flow channel 10. An air conveyor 43 is fixed inside the aeration drive housing 42. The output end of the air conveyor 43 is connected to each aeration conveying pipe 41 through a pipeline.

[0110] Example 8: This example describes a method for treating phosphorus pollution in a watershed. It is based on the phosphorus pollution treatment system in a watershed in Example 7 above. The difference from Example 6 is that in step S4, during the plant absorption and purification process, a micro-aeration mechanism 40 is used to aerate the water in the plant cultivation pond 101 to maintain the oxygen content required for the purification and adsorption of the roots of the plant 23.

[0111] Air conveyor 43 delivers fresh air from outside to each aeration pipe 41. The air in the aeration pipe 41 is then discharged from multiple aeration nozzles 411. The air moves from bottom to top in the water body of the plant cultivation pond 101, causing the oxygen in the air to gradually dissolve into the water body.

[0112] In practical application, this invention assumes that the water flow rate entering the sedimentation and flow channel 51 is 1000 m³ / s. 3The total phosphorus concentration (Cp) in the water is 5 mg / L. The reagent storage tank 54 contains an aluminum sulfate aqueous solution with a mass concentration of 300 g / L. Under ideal reaction conditions, if the reaction is complete, the dosage of aluminum sulfate aqueous solution is 92 L / h. Here, we adopt the "insufficient dosage" method, and the actual dosage is half of the theoretical dosage, which is 46 L / h. This is to avoid excessive aluminum sulfate causing new pollution sources, and it is sufficient to remove a considerable portion of the phosphorus.

Claims

1. A phosphorus pollution control system for water bodies, characterized in that, It includes multiple pollution control units arranged intersectingly on both sides of the river channel (100) along the direction of water flow. Each pollution control unit includes a treatment flow channel (10) and a pollution sedimentation mechanism (50) located at the upstream end of the treatment flow channel (10). Multiple flow partition walls (11) arranged perpendicular to the flow direction are fixed in the treatment flow channel (10). The flow partition walls (11) divide the treatment flow channel (10) into multiple plant cultivation ponds (101) and multiple pollution filtration ponds (102). Multiple plant cultivation ponds (101) and multiple pollution filtration ponds (102) are arranged sequentially at intervals along the flow direction of the treatment flow channel (10); The plant cultivation pool (101) is equipped with a plant purification mechanism (20), and the pollution filtration pool (102) is equipped with a pollution filtration mechanism (30). The plant purification mechanism (20) includes a plant support plate (21) that is disposed in the plant cultivation pool (101) and can move vertically. The plant support plate (21) has a plurality of vertically penetrating plant fixing holes (210). Plant restraint columns (22) are inserted into the plant fixing holes (210). The plant restraint columns (22) have vertically penetrating plant restraint holes (220). Purifying and adsorbing plants (23) are planted in the plant restraint holes (220). The treatment and circulation channel (10) is set next to the river channel (100), and the flow direction of the treatment and circulation channel (10) is consistent with the flow direction of the river channel (100). The upstream end of the treatment and circulation channel (10) is connected to the interior of the river channel (100) through the upstream circulation channel (1001), and the downstream end of the treatment and circulation channel (10) is connected to the interior of the river channel (100) through the downstream circulation channel (1002). The pollution filtration mechanism (30) includes a matrix filter housing (31), a middle filter housing (32) and a fine filter housing (33) arranged sequentially from bottom to top in the pollution filtration pool (102). The top and bottom of the matrix filter housing (31), the middle filter housing (32) and the fine filter housing (33) are all porous hollow structures that penetrate vertically inside and out. The inner sidewalls of the matrix filter housing (31), the middle filter housing (32) and the fine filter housing (33) are all covered with a layer of non-woven fabric. The matrix filter housing (31) is filled with matrix filter media (310), the middle filter housing (32) is filled with middle filter media (320), and the fine filter housing (33) is filled with fine filter media (330). The matrix filter media (310) is composed of gravel, pebbles, quartz sand and natural zeolite in a mass ratio of 3:2:1:1; The intermediate filter media (320) is composed of steel slag and granular activated carbon in a mass ratio of 5:2; The fine filter media (330) is composed of fly ash, iron-modified zeolite, clay, powdered activated carbon, nano Fe3O4, and nano TiO2 in a mass ratio of 10:5:3:2:1:

1. The pollution filtration pool (102) is connected to the plant cultivation pool (101) on the upstream side through multiple filter input pipes (341). The filter input pipes (341) are located near the lower end of the flow partition wall (11). The pollution filtration pool (102) is connected to the plant cultivation pool (101) on the downstream side through multiple filter output pipes (342). The filter output pipes (342) are fixed near the upper end of the flow partition wall (11). The filter output pipe (342) is inserted into the fine filter packing (330) at one end in the polluted filter tank (102). The side wall of the end of the filter output pipe (342) inside the fine filter packing (330) has a plurality of permeable holes (3420) that are connected inside and outside. The pollution sedimentation mechanism (50) includes a sedimentation flow channel (51), and a number of vertically extending agent delivery pipes (52) are fixed in the sedimentation flow channel (51) and near the upstream side. The agent delivery pipes (52) have a number of agent nozzles (521) connected to their interiors on their sides. The downstream end of the sedimentation flow channel (51) is connected to the upstream end of the treatment flow channel (10), and the upstream end of the sedimentation flow channel (51) is connected to the upstream flow channel (1001). A sedimentation interception plate (53) is placed at the bottom of the sedimentation flow channel (51), and multiple interception baffles (531) with square wave-shaped extensions are fixed on the top of the sedimentation interception plate (53). A reagent storage tank (54) is fixed at the top of the sedimentation flow channel (51). A reagent delivery pump (541) is provided in the reagent storage tank (54). The output end of the reagent delivery pump (541) is connected to each of the reagent delivery pipes (52) through a pipeline.

2. The phosphorus pollution control system for watersheds according to claim 1, characterized in that, The plant support plate (21) has a vertically penetrating lifting connection hole (241) at each end. A lifting drive ring (242) is rotatably connected in the lifting connection hole (241). Two vertically extending lifting mating columns (243) are fixed in the plant cultivation pool (101). The lifting mating columns (243) have external threads on the outside and internal threads on the inside of the lifting drive ring (242). The lifting mating columns (243) are threadedly connected to the lifting drive ring (242) one by one. A lifting driven worm gear (244) is fixed on the lifting drive ring (242), a lifting drive motor (245) is fixed on the upper side of the plant support plate (21), a lifting drive worm (246) is fixed on the output shaft of the lifting drive motor (245), and the lifting drive worm (246) is meshed with the lifting driven worm gear (244). The plant cultivation pool (101) has multiple vertically extending guide constraint rods (247) fixed inside, and the plant support plate (21) has multiple vertically penetrating guide constraint holes (248). The guide constraint rods (247) are slidably connected in each of the guide constraint holes (248).

3. The phosphorus pollution control system for watersheds according to claim 1, characterized in that, The top of the pollution filtration pool (102) is covered with a sealed top cover (35), and a negative pressure container (351) is fixed on the top of the sealed top cover (35). A negative pressure tank (352) and a negative pressure suction pump (353) are fixed in the negative pressure container (351). The input end of the negative pressure suction pump (353) is connected to the inside of the negative pressure tank (352) through the suction connecting pipe (354). The negative pressure tank (352) is fixed with a negative pressure connecting pipe (355) connected to its inside. The other end of the negative pressure connecting pipe (355) extends into the inside of the pollution filter pool (102). The suction connecting pipe (354) has a first control valve (3540), and the negative pressure connecting pipe (355) has a second control valve (3550).

4. The phosphorus pollution control system for watersheds according to claim 1, characterized in that, The plant cultivation pool (101) is provided with a micro-aeration mechanism (40) at the bottom. The micro-aeration mechanism (40) includes multiple aeration delivery pipes (41) located at the bottom of the plant cultivation pool (101). The upper side of the aeration delivery pipes (41) has multiple aeration nozzles (411) connected to its interior. An aeration drive housing (42) is fixed on the outside of the treatment flow channel (10), and an air conveyor (43) is fixed inside the aeration drive housing (42). The output end of the air conveyor (43) is connected to each of the aeration conveying pipes (41) through a pipe.

5. A method for treating phosphorus pollution in a watershed, based on the phosphorus pollution treatment system for a watershed as described in claim 1, characterized in that, Includes the following steps: S1, Cluster Settings: Set up 2 to 10 pollution control systems in the polluted river basin (100); S2, Water sedimentation treatment: In each pollution control system, the water in the river (100) first enters the sedimentation flow channel (51) through the upstream flow channel (1001). The agent storage tank (54) contains aluminum sulfate solution. The aluminum sulfate solution is pumped to each agent delivery pipe (52) by the agent delivery pump (541). The aluminum sulfate solution in the agent delivery pipe (52) is then discharged from the agent nozzle (521) and mixed with the water in the sedimentation flow channel (51). The aluminum sulfate solution reacts with the phosphate ions in the water to generate insoluble aluminum phosphate precipitate. The aluminum phosphate precipitate gradually falls to the top of the sedimentation interception plate (53) under its own weight and is intercepted by the interception baffle (531) for unified cleaning and recycling. S3, Filtration and purification process: Water discharged from the sedimentation flow channel (51) enters the treatment flow channel (10), and the water first enters the pollution filtration pool (102) through multiple filter input pipes (341); The water flows from bottom to top in the polluted filtration tank (102), passing through each matrix filtration container (31), middle layer filtration container (32) and fine filtration container (33) in sequence, and then the water is filtered and purified by the matrix filtration packing (310), middle layer filtration packing (320) and fine filtration packing (330) respectively. After the water reaches the fine filter media (330), it enters the filter output pipe (342) through the permeation holes (3420) and flows into the adjacent plant cultivation pond (101) along the filter output pipe (342). S4. Plant absorption and purification: After the water enters the plant cultivation pond (101), the roots of the purification and adsorption plant (23) are submerged in the water; the phosphorus element in the water is purified by the absorption of the roots of the purification and adsorption plant (23) in the form of soilless cultivation. Each treatment channel (10) has multiple pollution filtration pools (102) and plant cultivation pools (101) arranged alternately. The water in the plant cultivation pool (101) then enters the adjacent pollution filtration pool (102) downstream through multiple filter input pipes (341), repeatedly filtering and purifying the water and purifying it through plant absorption, thereby gradually reducing the concentration of phosphorus pollution in the water.

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