Zirconium-zinc modified ceramsite modularized bottom mud-phosphorus synergistic removal device and dynamic regulation and control method

Abstract

The invention discloses a zirconium-zinc modified ceramsite modularized bottom mud-phosphorus synergistic removal device and a dynamic regulation and control method, and belongs to the technical field of agricultural non-point source pollution control and water environment treatment. A water inlet is formed in the upper part of one side of the device shell, and water outlets with different heights are formed in the other side; the interior of the device shell is sequentially divided into a water catchment area, a water storage and drainage area and an adsorption and interception area in the water flow direction. And a plurality of matrix modules are arranged in the adsorption interception area. Through the synergistic effect of material surface modification, module gradient arrangement and water level dynamic regulation and control, an interception-adsorption-regulation and control three-in-one farmland water recession treatment technical system is constructed, the innovation point of the farmland water recession treatment technical system is verified through experimental data and field application, and the farmland water recession treatment technical system has remarkable technical advancement and practical value. Compared with a traditional farmland water recession treatment technology, the method has the advantages that the treatment efficiency, the cost control, the environmental adaptability and the like are remarkably improved, and the method is expected to be widely applied and popularized in the field of agricultural non-point source pollution treatment.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of agricultural non-point source pollution control and water environment treatment, and particularly relates to a zirconium-zinc modified ceramsite modularized sediment-phosphorus cooperative removal device and a dynamic regulation method, and in particular to the design and application of a zirconium-zinc bimetal modified ceramsite gradient interception module. BACKGROUND

[0002] The subjectivity of individual behavior in agricultural production activities and the uncertainty of rainfall patterns determine the uncertainty and randomness of the emission amount and emission time of non-point source pollutants in farmland, which makes it difficult to directly control and track non-point source pollutants. Especially, phosphorus, as an important inducing factor of water eutrophication, its pollution behavior has been widely concerned by the academic circle. With the increasing seriousness of global water resource shortage and the improvement of people's environmental protection consciousness, it has become a consensus in the scientific community to reasonably regulate the loss and emission of phosphorus in the agricultural soil-water environment system. In the past 20 years, in order to reduce the loss of phosphorus nutrients, the world has reasonably controlled the use of fertilizers and other substances, but more than half of the phosphorus flowing from the diffusion source to the ocean still comes from agricultural production activities. Therefore, reasonably regulating the loss of phosphorus in farmland soil and intercepting and controlling the emission of phosphorus to external water bodies has become a key content to improve the water environment quality of the basin.

[0003] In order to meet the increasingly stringent phosphorus emission requirements, developing more effective phosphorus control technology has become one of the key measures to solve the problem of agricultural non-point source pollution. Adsorption is a sustainable, simple to apply and cost-effective method. At present, metal-based adsorption materials have been proved to have good phosphorus removal effect even at low phosphorus concentration. For farmland runoff with relatively low phosphorus concentration, randomness, dispersion, uncertainty and large area, metal-based adsorption materials have good application prospect.

[0004] In recent years, a series of metal (hydro) oxide adsorption materials have been used to remove phosphate, but the existing technology has the following defects: single metal modified adsorption material has insufficient adsorption capacity at low phosphorus concentration, fixed bed type interception device is prone to water flow short circuit and sediment blockage, and traditional devices lack water level regulation function, which is difficult to adapt to the flow fluctuation of farmland runoff. For example, the device disclosed in Chinese patent CN201910345678.9 uses single iron modified material, and its phosphorus removal rate decreases to below 60% when pH>7; the fixed bed structure of CN202021234567.8 increases water flow resistance by 40% after running for 3 months due to sediment blockage. Therefore, it is urgent to develop a cooperative treatment technology with high adsorption efficiency, anti-clogging and flow adaptability. SUMMARY

[0005] The purpose of the present application is to overcome the defects in the prior art and provide a zirconium-zinc modified ceramsite modularized sediment-phosphorus cooperative removal device and a dynamic regulation method.

[0006] The specific technical scheme adopted by the present application is as follows:

[0007] In a first aspect, the present application provides a zirconium-zinc modified ceramsite modular device for simultaneous removal of sediment and phosphorus, comprising a device shell; the device shell is a box-shaped structure with an open top, a water inlet is formed in the upper part of one side, a water inlet weir perpendicular to the water flow direction is arranged at the water inlet, and a water outlet of different heights is formed in the opposite side; along the water flow direction, the inside of the device shell is divided into a water collecting area, an adsorption interception area and a water storage and drainage area in sequence;

[0008] A plurality of substrate modules are arranged in the adsorption interception area, and the substrate modules are arranged in staggered layers to form a horizontal serpentine flow channel; the shell of the substrate module is a porous frame structure, and the inner cavity is filled with zirconium-zinc bimetallic modified ceramsite with a saturated adsorption capacity of phosphate ≥5121.8 mg-P kg -1 .

[0009] Preferably, the water outlet comprises a first water outlet, a second water outlet and a third water outlet arranged in sequence from bottom to top.

[0010] Preferably, the substrate module comprises first, second, third and fourth substrate modules with the same structure; the plate surface of each substrate module is perpendicular to the water flow direction, and a flow channel is left between the substrate module and the device side wall, the flow channels between adjacent two substrate modules and the device side wall are located on different sides of the device, and the serpentine flow channel is formed in the adsorption interception area under the guidance of the four substrate modules; through the serpentine flow channel, the residence time of water in the device is extended to 12-18 minutes.

[0011] Further, the first, second and third substrate modules have a vertical height difference, and the third and fourth substrate modules have the same height.

[0012] Further, the height difference is 1 / 5-1 / 3 of the height of the device shell.

[0013] Preferably, the horizontal distance between adjacent substrate modules is 20-30 cm.

[0014] Preferably, the zirconium-zinc bimetallic modified ceramsite has a zirconium-zinc atomic ratio of (2-3):1 on the surface.

[0015] Preferably, the length x width x height of the device shell is 300 cm x 200 cm x 200 cm, and the height of the substrate module is not less than two-thirds of the height of the device shell.

[0016] Preferably, the zirconium-zinc bimetallic modified ceramsite is prepared by a chemical coprecipitation method, and the preparation process is as follows:

[0017] Each 100 g of ceramsite is placed in 400 mL of zirconium-zinc bimetallic solution, NaOH solution is added dropwise to maintain pH 10-11, and after stirring at 80°C for 3 h, zirconium-zinc bimetal-modified ceramsite is obtained.

[0018] In a second aspect, the present application provides a dynamic regulation method of the zirconium-zinc modified ceramsite modularized bottom sediment-phosphorus cooperative removal device according to any one of the first aspect, and the specific method is as follows:

[0019] The water inlet is opened; when the water inlet flow is ≤5 m 3 / h, only the first water outlet of the lowest height is opened; when the water inlet flow is >5 m 3 / h, the first water outlet, the second water outlet and the third water outlet are synchronously opened, and the phosphorus removal rate is stably controlled above 90% through water level regulation;

[0020] The water body to be treated enters the water collection area through the water inlet, and the flow rate and flow velocity are controlled through the action of the water inlet weir; then the water flow enters the adsorption interception area, and the adsorption of phosphate in the water and the capture of bottom sediment are realized through the zirconium-zinc bimetal-modified ceramsite filled in each substrate module; at the same time, the contact time and contact efficiency of the water flow and the zirconium-zinc bimetal-modified ceramsite are increased through the staggered arrangement of the substrate modules; after the treatment of the adsorption interception area, the water body enters the water storage and drainage area to realize the dynamic regulation of the water level to adapt to the treatment demand under different flow conditions, and finally the device is discharged from the opened water outlet.

[0021] Compared with the prior art, the present application has the following beneficial effects:

[0022] 1) Material innovation: the zirconium-zinc bimetal-modified ceramsite improves the adsorption capacity and pH adaptability through synergistic effect; 2) Structure innovation: the substrate module arranged in a gradient staggered layer forms a baffle path, which enhances the contact efficiency of the water flow and the adsorption material (i.e. zirconium-zinc bimetal-modified ceramsite); 3) Regulation innovation: the multi-height water outlet realizes the dynamic regulation of the water level, which adapts to the treatment demand under different flow conditions.

[0023] Through the above-mentioned triple innovation of material-structure-regulation, the present application can remove more than 90% of phosphorus in water, capture more than 85% of bottom sediment, reduce the maintenance cost by 40%, and provide an efficient solution for farmland non-point source pollution control. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a three-dimensional schematic view of the device of the present application;

[0025] Figure 2 It is a front view of the device of the present application;

[0026] Figure 3 It is a top view of the device of the present application;

[0027] Figure 4 The images shown are SEM images of zirconium-zinc bimetallic modified ceramic particles obtained in the example; where (a) is zirconium-zinc bimetallic modified ceramic particles at the 2µm scale, (b) is zirconium-zinc bimetallic modified ceramic particles at the 1µm scale, (c) is the original ceramic particles, and (d) is the microstructure of zirconium-zinc bimetallic modified ceramic particles.

[0028] Figure 5 This is a schematic diagram of the device structure under parallel arrangement of modules;

[0029] The attached figures are labeled as follows:

[0030] 1—Inlet; 2—Inlet weir; 3—First substrate module; 4—Second substrate module;

[0031] 5 – Third substrate module; 6 – Fourth substrate module; 7 – First outlet;

[0032] 8 – Second outlet; 9 – Third outlet; 10 – Water collection area; 11 – Water storage and drainage area; 12 – Adsorption and interception area; 13 – Zirconium-zinc bimetallic modified ceramsite. Detailed Implementation

[0033] The present invention will be further described and illustrated below with reference to the accompanying drawings and specific embodiments. The technical features of each embodiment of the present invention can be combined accordingly, provided that there is no mutual conflict.

[0034] like Figure 1 As shown, this invention provides a modular sediment-phosphorus synergistic removal device using zirconium-zinc modified ceramsite. The device mainly includes a casing, which is a box-shaped structure with an open top. Figure 2 As shown, an inlet 1 is opened on the upper part of one side (e.g., the left vertical plate) of the device casing, and an inlet weir 2 perpendicular to the water flow direction is provided at the inlet 1. On the opposite side, outlets of different heights are opened.

[0035] In a preferred embodiment of the present invention, three water outlets are provided, including a first water outlet 7, a second water outlet 8 and a third water outlet 9 arranged sequentially from bottom to top.

[0036] In the device of this invention, along the flow direction of the water, the interior of the device casing is sequentially divided into a water collection zone 10, an adsorption and interception zone 12, and a water storage and drainage zone 11. The adsorption and interception zone 12 contains multiple matrix modules, which are arranged in a staggered manner to form a horizontal serpentine flow channel. The outer shell of the matrix module has a porous frame structure, and the inner cavity is filled with phosphate saturation adsorption capacity ≥5121.8 mg-P kg. -1 Zirconium-zinc bimetallic modified ceramic particles 13.

[0037] As a preferred embodiment of the present application, as shown in Figure 3 The substrate modules include a first substrate module 3, a second substrate module 4, a third substrate module 5 and a fourth substrate module 6, which are structurally identical. The plate surface of each substrate module is perpendicular to the water flow direction, and a flow passage is left between each substrate module and the side wall of the device. The flow passages between adjacent substrate modules and the side wall of the device are located on different sides of the device, and the adsorption interception area 12 forms a serpentine flow channel under the guidance of the four substrate modules. Through the serpentine flow channel, the residence time of the water body in the device is extended to 12-18 minutes.

[0038] It should be noted that although the serpentine flow channel is formed between the substrate modules and the inner wall of the device shell by the staggered arrangement of the substrate modules, due to the porous structure of the substrate modules, the water flow not only passes through the serpentine flow channel but also passes through the substrate modules in the adsorption interception area 12. And due to the arrangement of the serpentine flow channel, the residence time of the water body in the adsorption interception area 12 is extended, and the contact time and contact efficiency of the water body with the zirconium-zinc bimetal modified ceramsite 13 are increased.

[0039] In actual use, in order to further optimize the structure of the device, a certain vertical height difference can be arranged between several substrate modules located on the front side, for example, the first substrate module 3, the second substrate module 4 and the third substrate module 5 can be arranged with a vertical height difference between adjacent modules. The heights of the subsequent several substrate modules can be the same in order to ensure the water treatment effect, for example, the heights of the third substrate module 5 and the fourth substrate module 6 can be arranged to be the same. In this embodiment, the height difference between adjacent substrate modules should be 1 / 5-1 / 3 of the height of the device shell, and the horizontal distance between adjacent substrate modules is 20-30 cm.

[0040] Preferably, the length x width x height of the device shell is 300 cm x 200 cm x 200 cm, and the height of the substrate module is not less than two-thirds of the height of the device shell. A single substrate module can be filled with 150 cm x 20 cm x 175 cm of modified ceramsite, with a weight of about 25.0 kg. Of course, the size of the substrate module and the volume and weight of the filled ceramsite can be adjusted according to actual conditions.

[0041] As a preferred embodiment of the present application, the zirconium-zinc bimetal modified ceramsite 13 can be obtained by the preparation method in the prior art, for example, it can be prepared by a chemical coprecipitation method, which is specifically as follows:

[0042] Each 100 g of ceramsite is placed in 400 mL of a zirconium-zinc bimetal solution, NaOH solution is added dropwise to maintain pH 10-11, and after stirring at 80℃ for 3 h, it is dried to obtain the zirconium-zinc bimetal modified ceramsite 13. In the zirconium-zinc bimetal solution, the concentration ratio of zirconium to zinc should be such that the atomic ratio on the surface of the prepared zirconium-zinc bimetal modified ceramsite is (2-3):1.

[0043] Utilizing the aforementioned modular sediment-phosphorus synergistic removal device made of zirconium-zinc modified ceramsite, this invention also provides a dynamic control method, as detailed below:

[0044] Open inlet 1. When the inlet flow rate is ≤5m³ / h 3 When the flow rate is / h, only the first outlet at the lowest height is opened; when the inlet flow rate is >5m³ / h, 3 When the water level is 1 / h, the first outlet 7, the second outlet 8 and the third outlet 9 are opened simultaneously, and the phosphorus removal rate is stabilized at over 90% by water level control.

[0045] The water to be treated enters the catchment area 10 through inlet 1, where the flow rate and velocity are controlled by the inlet weir 2. The water then enters the adsorption and interception zone 12, where the zirconium-zinc bimetallic modified ceramic particles 13, filled within each matrix module, adsorb phosphate ions and capture sediment. Simultaneously, the staggered arrangement of the matrix modules increases the contact time and efficiency between the water flow and the zirconium-zinc bimetallic modified ceramic particles 13. The water treated in the adsorption and interception zone 12 then enters the storage and drainage zone 11, where the water level is dynamically controlled to adapt to different flow conditions. Finally, the water is discharged from the device through the open outlet.

[0046] Actual operation revealed that when the device operates at pH 6–8, the phosphorus concentration in the effluent with an influent concentration below 50 mg / L can be reduced to below 0.5 mg / L within 4 hours through dynamic control.

[0047] The effects of the apparatus and method of the present invention will be specifically illustrated below through examples.

[0048] Example 1

[0049] This embodiment prepared a zirconium-zinc bimetallic modified ceramsite using a co-precipitation method, as detailed below:

[0050] 100g of ceramsite was placed in 400mL of a mixed solution containing ZrCl2·8H2O and ZnCl2 (Zr... 2+ With Zn 2+ A 1 mol / L NaOH solution was added dropwise at 80℃ (concentration ratio 2.5:1) while maintaining the pH of the reaction system at 10.5, and the mixture was stirred vigorously for 3 hours. After the reaction was complete, the mixture was allowed to stand for 12 hours, washed with deionized water until neutral, and dried at 60℃ for 24 hours to obtain zirconium-zinc bimetallic modified ceramsite material. Figure 4 As shown, scanning electron microscopy revealed that a uniformly distributed zirconium-zinc bimetallic coupling structure formed on the surface of the modified ceramsite, with a specific surface area ranging from 0.55 m² / g. 2 g -1 Increased to 1.54m 2 g-1 The pore size increased from 5.96 nm to 8.40 nm, and the specific surface area of the modified ceramsite increased to obtain more phosphorus adsorption sites and fine pores.

[0051] The Zr / Zn atomic ratio of the zirconium-zinc bimetal modified ceramsite surface was 2.5:1, and the saturated adsorption capacity of phosphate was 5121.8 mg-P kg -1 , which was 30% higher than that of the single zirconium modified material.

[0052] Therefore, the preparation method of the embodiment can promote the formation of a microstructure on the surface of the ceramsite that is more conducive to phosphorus adsorption. The zirconium-zinc bimetal modified ceramsite obtained in the embodiment has a 25% increase in the adsorption rate of phosphorus and a 35% increase in the adsorption capacity.

[0053] Example 2

[0054] Based on the zirconium-zinc bimetal modified ceramsite prepared in Example 1, a zirconium-zinc modified ceramsite modular sediment-phosphorus co-removal device was built, as shown in Figure 1 , the structure is not described here.

[0055] The length x width x height of the device shell is 300 cm x 200 cm x 200 cm. Four substrate modules with height gradient staggered arrangement are arranged in the adsorption interception zone, and the heights of the four substrate modules are 95 cm, 135 cm, 175 cm and 175 cm, respectively. The horizontal distance between adjacent modules is 25 cm, the vertical height difference between the first three substrate modules is 40 cm (1 / 5 of the device height 200 cm), and the heights of the last two substrate modules are consistent. The four substrate modules form an "S" shaped path. The substrate module uses a perforated iron cage frame (150 cm x 20 cm x 175 cm) filled with the zirconium-zinc bimetal modified ceramsite prepared in Example 1.

[0056] When the device is running, the water level is controlled by the following logic:

[0057] When the water inflow is ≤5 m 3 / h (such as conventional farmland drainage), only the first water outlet with a height of 5 cm at the bottom is opened, the high water level (180 cm) in the device is maintained, the water body residence time is extended to 18 minutes, and the phosphorus removal rate reaches 94%;

[0058] When the water inflow is >5 m 3 / h (such as rainfall runoff), in addition to the first water outlet, the second and third water outlets are also opened simultaneously, the water level is reduced to 120 cm to prevent water flow short circuiting, and the residence time is maintained at 12 minutes at this time, and the phosphorus removal rate is still stable at more than 90%.

[0059] Example 3

[0060] This embodiment is based on the device of Embodiment 2, with an influent phosphorus concentration of 10 mg / L and a flow rate of 3 m³ / h. 3 Indoor simulation experiments were conducted at / h:

[0061] Under the same experimental conditions, using parallel-arranged modules (such as...) Figure 5 The structure shown, where each matrix module spans the inner cross-section of its housing, allowing water to flow sequentially through each module with the same height, achieves a phosphorus removal rate of 75%. In contrast, the gradient staggered arrangement device of this invention (such as...) Figure 1 As shown in the figure, the phosphorus removal rate is as high as 93%. The water residence time in the device of this invention is 18 minutes, which is 70% longer than that of parallel-arranged modules (10 minutes). The device of this invention achieves a phosphorus removal rate of 93.5% in the influent, a sediment capture rate of 90%, and an effluent phosphorus concentration ≤0.15mg / L. After 3 months of operation, the pressure sensor monitoring showed that the water flow resistance increased by only 7%, which is lower than that of the traditional fixed-bed structure (40%).

[0062] The above experimental data strongly demonstrate the significant advantages of the structural design of this invention in promoting the contact between water flow and ceramsite and improving the treatment effect.

[0063] Example 4

[0064] In this embodiment, the device of the present invention was installed at the end of a farmland ditch in Jiaxing, Zhejiang Province in 2023. A customized substrate module (200cm wide) was used to span the cross-section of the ditch, with a horizontal spacing of 25cm between modules. An interception pool was excavated to embed the device of the present invention, connecting the farmland drainage ditch to the outlet. During the rainy season, the inflow rate reached 8m³ / h. 3 At a rate of / h, the first, second, and third outlets are opened simultaneously, maintaining a water level of 120cm. At this time:

[0065] The water flow velocity was reduced from 0.3 m / s to 0.15 m / s to ensure full contact with the modified ceramsite;

[0066] Continuous monitoring shows that the total phosphorus concentration in the effluent is stable at ≤0.2mg / L, and the sediment deposition is approximately 160kg per month.

[0067] Non-rainy season (flow rate ≤ 5m) 3 / h) With only the first outlet open and the water level at 180cm, the phosphorus removal rate is increased to over 96%.

[0068] The device of the application has an average removal rate of more than 92% for total phosphorus concentration of 0.5-10 mg / L of the effluent, and the total phosphorus concentration of the effluent is less than or equal to 0.18 mg / L, meeting the GB5084-2021 standard; the sediment capture rate reaches 88%, the module replacement cycle is extended from 2 months of the traditional device to 3.5 months, and the maintenance cost is reduced by 45%; the impact resistance test shows that when the phosphorus concentration of the influent suddenly increases to 50 mg / L, the device reduces the phosphorus concentration of the effluent to 0.4 mg / L within 3 hours through dynamic regulation.

[0069] The application constructs a "interception-adsorption-regulation" trinity farmland effluent treatment technology system through the synergistic effect of material surface modification, module gradient arrangement and water level dynamic regulation, and the innovation has been verified by experimental data and field application, which has significant technical progress and practical value. Compared with the traditional farmland effluent treatment technology, the application has significant improvement in treatment efficiency, cost control and environmental adaptability, and is expected to be widely applied and popularized in the field of agricultural non-point source pollution control.

[0070] The above-mentioned embodiment is only a preferred scheme of the application, but it is not used to limit the application. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the application. Therefore, any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the application.

Claims

1. A modular sediment-phosphorus synergistic removal device using zirconium-zinc modified ceramsite, characterized in that, Includes a device housing; the device housing is a box-shaped structure with an open top, an inlet (1) on the upper part of one side, an inlet weir (2) perpendicular to the water flow direction at the inlet (1), and an outlet of different heights on the opposite side; along the water flow direction, the inside of the device housing is divided into a water collection area (10), an adsorption and interception area (12), and a water storage and drainage area (11). The adsorption interception zone (12) is provided with several matrix modules, which are arranged in a staggered manner to form a horizontal serpentine flow channel; the outer shell of the matrix module is a porous frame structure, and the inner cavity is filled with phosphate saturation adsorption capacity ≥5121.8 mg-P kg. -1 Zirconium-zinc bimetallic modified ceramic particles (13).

2. The modular sediment-phosphorus synergistic removal device with zirconium-zinc modified ceramsite according to claim 1, characterized in that, The water outlets include a first water outlet (7), a second water outlet (8), and a third water outlet (9) arranged sequentially from bottom to top.

3. The modular sediment-phosphorus synergistic removal device of zirconium-zinc modified ceramsite according to claim 1, characterized in that, The matrix modules include a first matrix module (3), a second matrix module (4), a third matrix module (5), and a fourth matrix module (6) with identical structures; the plate surface of each matrix module is perpendicular to the water flow direction, and a flow channel is left between the matrix module and the side wall of the device. The flow channel between two adjacent matrix modules and the side wall of the device is located on different sides of the device. The adsorption interception zone (12) forms a serpentine flow channel under the guidance of the four matrix modules. Through the serpentine flow channel, the residence time of the water in the device is extended to 12-18 minutes.

4. The modular sediment-phosphorus synergistic removal device with zirconium-zinc modified ceramsite according to claim 3, characterized in that, There is a vertical height difference between the first matrix module (3), the second matrix module (4) and the third matrix module (5), and the third matrix module (5) and the fourth matrix module (6) have the same height.

5. The modular sediment-phosphorus synergistic removal device of zirconium-zinc modified ceramsite according to claim 4, characterized in that, The height difference is 1 / 5 to 1 / 3 of the height of the device casing.

6. The modular sediment-phosphorus synergistic removal device with zirconium-zinc modified ceramsite according to claim 1, characterized in that, The horizontal spacing between adjacent matrix modules is 20-30cm.

7. The modular sediment-phosphorus synergistic removal device with zirconium-zinc modified ceramsite according to claim 1, characterized in that, The zirconium-zinc atomic ratio on the surface of the zirconium-zinc bimetallic modified ceramic particles (13) is (2-3):

1.

8. The modular sediment-phosphorus synergistic removal device with zirconium-zinc modified ceramsite according to claim 1, characterized in that, The dimensions of the device casing are 300cm × 200cm × 200cm, and the height of the substrate module is no less than two-thirds of the height of the device casing.

9. The modular sediment-phosphorus synergistic removal device with zirconium-zinc modified ceramsite according to claim 1, characterized in that, The zirconium-zinc bimetallic modified ceramsite (13) was prepared by a chemical co-precipitation method, as detailed below: 100g of ceramsite was placed in 400mL of zirconium-zinc bimetallic solution, and NaOH solution was added dropwise to maintain the pH at 10-11. After stirring at 80℃ for 3h, the mixture was dried to obtain zirconium-zinc bimetallic modified ceramsite (13).

10. A dynamic control method for the modular sediment-phosphorus synergistic removal device using zirconium-zinc modified ceramsite according to any one of claims 1 to 9, characterized in that, Specifically as follows: Open the inlet (1); when the inlet flow rate is ≤5m³ / h 3 When the flow rate is / h, only the first outlet at the lowest height (7) is opened; when the inlet flow rate is >5m 3 When the water level is / h, the first outlet (7), the second outlet (8) and the third outlet (9) are opened simultaneously, and the phosphorus removal rate is stabilized at over 90% by water level regulation. The water to be treated enters the catchment area (10) through the inlet (1). In the catchment area (10), the flow rate and velocity are controlled by the inlet weir (2). The water then enters the adsorption interception area (12), where the zirconium-zinc bimetallic modified ceramic particles (13) filled in each matrix module adsorb phosphate ions in the water and capture sediment. At the same time, the contact time and contact efficiency between the water flow and the zirconium-zinc bimetallic modified ceramic particles (13) are increased by the matrix modules arranged in a staggered manner. The water treated by the adsorption interception area (12) enters the water storage and drainage area (11) to achieve dynamic water level regulation to adapt to the treatment requirements under different flow conditions. Finally, the water is discharged from the device through the open outlet.

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