Preparation method and application of constructed wetland filler for adsorbing phosphorus

Abstract

The invention belongs to the technical field of water treatment materials, and particularly relates to a preparation method and application of a constructed wetland filler for adsorbing phosphorus. The filler is prepared from a phosphorus adsorbent and a solid waste filler. The constructed wetland filler has the phosphorus adsorption performance, and the preparation method of the constructed wetland filler has the advantages of being convenient to produce, low in treatment cost, good in effect and the like. As the filler contains a large number of uniform and fine air holes, the specific surface area of the filler is greatly increased, microbial growth, P adsorption, filtration, interception and the like are facilitated, and enough gaps can be provided for sufficient biochemical reaction due to the large packing void ratio. The raw materials used in the technical scheme disclosed by the invention are easy to obtain and relatively low in price, so that the method is completely suitable for industrial popularization and application.

Description

Technical Field

[0001] The invention belongs to the technical field of water treatment materials, and in particular relates to a preparation method and application of an artificial wetland filler capable of absorbing phosphorus. Background Art

[0002] Excessive phosphorus can easily lead to eutrophication of water bodies and affect the growth of aquatic plants and animals, so it is particularly important to pay attention to and control phosphorus in sewage. Constructed wetlands have become a green and economical method for removing phosphorus from sewage. Constructed wetlands are a place that can provide leisure and entertainment, and are also an ecological treatment technology that can deeply purify phosphorus-containing wastewater. This technology has the advantages of low investment, stable effluent water quality, and good landscape effects. It has been widely used in the deep purification of rural domestic sewage and river and lake water.

[0003] Fillers are an important component and main carrier of artificial wetland systems, and have a decisive influence on the effect of wetland phosphorus removal. However, traditional fillers such as sand, construction waste, gravel, etc., due to their low adsorption capacity and stability, limit the efficiency of phosphorus removal in artificial wetlands. Although artificial wetland filler technology has certain advantages in sewage treatment, there are still some technical defects: poor purification effect: weak application of plant root purification and microbial action, resulting in poor overall purification effect; easy to clog: the filler layer is easy to clog, affecting water flow distribution and treatment effect. Difficult maintenance and management: once the artificial wetland is established, its internal filler and plant configuration are difficult to adjust. If the treatment capacity and pollutant types are to be changed, it needs to be redesigned and constructed. Therefore, the existing artificial wetland fillers are still ineffective in treating low concentrations and eutrophication in water, and it is difficult to achieve the goal of efficient phosphorus removal.

[0004] CN118239603A discloses a method for preparing a lanthanum-loaded artificial wetland filler for deep phosphorus removal. The technical solution mainly uses the strong adsorption capacity of the rare earth element lanthanum (La): lanthanum (La) can quickly adsorb low-concentration phosphorus in water. Through the adsorption of lanthanum on the filler, phosphorus ions are effectively captured and removed, thereby achieving the effect of deep removal of low-concentration phosphorus. However, lanthanum (La) is a rare earth element after all, and it is not cost-effective to use it in large quantities in the preparation of artificial wetland fillers from an economic perspective.

[0005] Therefore, it is urgent to develop new fillers to cope with the reduction of phosphorus in water, comprehensively evaluate the economy and effectiveness, and reduce the occurrence of eutrophication in artificial wetlands. Summary of the invention

[0006] In view of the above problems, the present invention aims to provide a method for preparing a phosphorus-adsorbing artificial wetland filler. The filler prepared by the method can significantly improve the phosphorus removal effect. The negatively charged phosphate can be adsorbed by anion exchange with the filler surface. On the other hand, Al in the filler3+ and Zr 3+ Metal cations such as phosphate react with soluble phosphates to form insoluble phosphate precipitates.

[0007] The specific technical solutions are as follows: A method for preparing a phosphorus-adsorbing artificial wetland filler comprises the following steps: (1) Modification of basic materials: Take zeolite, ceramsite, quartz sand and fly ash and mix them with alkaline solution respectively, stir and react at 60-80℃ for 20-40min, and air dry them for later use; collect lake sediment, air dry it, grind it through a 40-80 mesh sieve, and obtain sediment powder for later use; (2) Preparation of adsorbent: Sodium alginate, ZrCl4, and KCl are taken as adsorbent raw materials in a mass ratio of 5-10:1-3:4, and then N,N-methylenebisacrylamide and potassium persulfate solution are added, wherein N,N-methylenebisacrylamide accounts for 1%-4% of the mass of the adsorbent raw material, and the volume mass ratio of potassium persulfate solution to adsorbent raw material is 0.4-0.5:1 (mL / g). Then, 5-10% ethanol solution is added, and the above raw materials are mixed and stirred at room temperature for 20-30 minutes, and the solid is filtered and dried at 40-50°C to obtain the adsorbent loaded with Zr and K, which is marked as ZrK@SA; (3) taking 20-30 parts of the modified basic material zeolite in step (1), 10-20 parts of ceramsite, 10-20 parts of quartz sand, 10-20 parts of fly ash and 80-100 parts of lake sediment, 10-20 parts of the ZrK@SA prepared in step (2) and 200-300 parts of water, stirring them into a slurry, taking 1-2 parts of a foaming agent and making foam with the foaming agent; (4) Mix the foam with the prepared pure slurry and stir evenly to obtain a foam slurry. Then mix 30-50 parts of cement, 3-4 parts of cementitious enhancer and 3-4 parts of accelerator with the foam slurry, and further knead it into balls with a diameter of 2-5 mm and dry or naturally dry them.

[0008] Preferably, the alkaline solution in step (1) is one or more of sodium hydroxide, potassium hydroxide or calcium hydroxide, with a mass fraction of 20-40%.

[0009] Preferably, in step (1), the mass volume ratio of the zeolite, ceramsite, quartz sand, fly ash and alkaline solution is 100:5-10 (kg / L).

[0010] Preferably, in step (2), the mass ratio of sodium alginate, ZrCl4 and KCl is 8:1:4.

[0011] Preferably, in step (2), the total amount of the adsorbent raw material and the mass volume of the ethanol solution are 61-80:100 (kg / L).

[0012] Preferably, the foaming agent in step (3) is sodium dodecylbenzene sulfonate.

[0013] Preferably, the bonding enhancer is composed of diethylene glycol, starch syrup and glycerol in a mass ratio of 1:1:3.

[0014] Preferably, the accelerating setting agent is composed of 40-50 parts of aluminum sulfate, 2-3 parts of diethanolamine, 5-10 parts of bentonite and 40-45 parts of water in parts by mass.

[0015] The artificial wetland filler prepared according to the above method is further used as a water treatment material.

[0016] The beneficial effects of the present invention are as follows: the basic fillers used in the present invention are all pre-treated with alkali solution, which can achieve -OH-rich basic fillers. This step can not only achieve that negatively charged phosphate can be adsorbed by anion exchange with the filler surface, but also effectively promote the effective close adsorption of the adsorbent with the basic filler in the later process steps and increase the surface roughness of the basic filler. In addition, the present invention innovatively develops ZrK@SA adsorbent as the core raw material of the filler, and Al in the filler 3+ and Zr 3+ The metal cations react with the soluble P compounds to form insoluble phosphate precipitates. In addition, the scheme disclosed in the present invention uses a combination of a foaming agent and an accelerator. The bubble material produced by the foaming agent can play the role of a ball in the mixed raw materials, which greatly improves and enhances the workability of the filler, so that the bubble wall contains a large number of tiny pores, further forming an open-cell structure of the open-cell foam filler, increasing the water permeability, and the filler prepared by this method can significantly improve the phosphorus removal effect. In terms of raw material costs, the raw materials used in the technical scheme disclosed in the present invention are easy to obtain and relatively cheap, and are completely suitable for industrial promotion and application. DETAILED DESCRIPTION

[0017] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0018] The ceramsite used in the following examples was purchased from Changcai Energy Saving Technology Co., Ltd. (specification 1-5 mm), quartz sand was purchased from Henan Dongwanyuan Water Purification Materials Co., Ltd. (specification 10-20 mesh), fly ash was purchased from Hebei Kaicong Building Materials Technology Co., Ltd., and the lake sediment came from the lake sediment of the ecological park.

[0019] Example 1 A method for preparing a phosphorus-adsorbing artificial wetland filler comprises the following steps: (1) Modification of basic materials: zeolite, ceramsite, quartz sand and fly ash were mixed with 30% sodium hydroxide solution by mass, stirred at 70°C for 40 min, and naturally air-dried for 2 days for use; lake sediment was collected, naturally air-dried for 12 days, and ground through a 50-mesh sieve to obtain sediment powder for use. The mass-to-volume ratio of zeolite, ceramsite, quartz sand, fly ash and sodium hydroxide solution was 100:5 (kg / L); (2) Preparation of adsorbent: Sodium alginate, ZrCl4, and KCl were taken as adsorbent raw materials in a mass ratio of 8:1:4, and then N,N-methylenebisacrylamide and potassium persulfate solution were added, wherein N,N-methylenebisacrylamide accounted for 4% of the mass of the adsorbent raw material, and the volume mass ratio of potassium persulfate solution to adsorbent raw material was 0.5:1 (mL / g). Then, 6% ethanol aqueous solution was added, and the total amount of adsorbent raw material and the mass volume of ethanol aqueous solution were 65:100 (kg / L). The above raw materials were mixed and stirred at room temperature for 20 minutes, and the filter residue solid was filtered and dried at 40°C for 30 minutes to obtain the adsorbent loaded with Zr and K, which was marked as ZrK@SA; (3) Taking 20 parts of the modified basic materials zeolite in step (1), 20 parts of ceramsite, 20 parts of quartz sand, 20 parts of fly ash and 100 parts of lake sediment, 20 parts of ZrK@SA prepared in step (2) and 200-300 parts of water, by weight, and stirring them into a slurry; taking 2 parts of sodium dodecylbenzene sulfonate and 5 parts of water, and mixing them together to prepare a foam mixture; (4) The entire foam mixture obtained in step (3) is mixed and stirred evenly with the slurry to obtain a foam slurry, and then 30 parts of cement, 3 parts of a binder enhancer (diethylene glycol, sugar, and propylene glycol in a mass ratio of 1:1:3), and 4 parts of an accelerator (aluminum sulfate, diethanolamine, bentonite, and water in a mass ratio of 40:2:5:40) are mixed with the entire foam slurry, and further kneaded into a spherical shape with a diameter of 3 mm and naturally dried to form a shape.

[0020] Example 2 A method for preparing a phosphorus-adsorbing artificial wetland filler comprises the following steps: (1) Modification of basic materials: zeolite, ceramsite, quartz sand and fly ash were mixed with 30% sodium hydroxide solution by mass, stirred at 70°C for 30 min, and naturally air-dried for 2 days for use; lake sediment was collected, naturally air-dried for 12 days, and ground through a 60-mesh sieve to obtain sediment powder for use. The mass-to-volume ratio of zeolite, ceramsite, quartz sand, fly ash and sodium hydroxide solution was 100:5 (kg / L); (2) Preparation of adsorbent: Sodium alginate, ZrCl4, and KCl were taken as adsorbent raw materials in a mass ratio of 5:1:4, and then N,N-methylenebisacrylamide and potassium persulfate solution were added, wherein N,N-methylenebisacrylamide accounted for 4% of the mass of the adsorbent raw material, and the volume mass ratio of potassium persulfate solution to adsorbent raw material was 0.4:1 (mL / g). Then, 8% ethanol solution was added, and the total amount of adsorbent raw material and the mass volume of ethanol solution were 75:100 (kg / L). The above raw materials were mixed and stirred at room temperature for 30 minutes, and the solid was filtered and dried at 50°C for 40 minutes to obtain the adsorbent loaded with Zr and K, which was marked as ZrK@SA; (3) Taking, by weight, 30 parts of the modified basic material zeolite prepared in step (1), 10 parts of ceramsite, 15 parts of quartz sand, 20 parts of fly ash and 80 parts of lake sediment, 15 parts of the ZrK@SA prepared in step (2) and 300 parts of water, stirring them into a slurry, taking 2 parts of sodium dodecylbenzene sulfonate agent and 5 parts of water, and mixing them together to prepare a foam mixture; (4) The entire foam mixture is mixed with the prepared slurry and stirred evenly to obtain a foam slurry. Then, 40 parts of cement, 3 parts of a binder enhancer (diethylene glycol, sugar, and propylene glycol in a mass ratio of 1:1:3), and 4 parts of an accelerator (aluminum sulfate, diethanolamine, bentonite, and water in a mass ratio of 50:3:5:45) are mixed with the entire foam slurry, and the mixture is further kneaded into a spherical shape with a diameter of 4 mm and naturally dried.

[0021] Example 3 A method for preparing a phosphorus-adsorbing artificial wetland filler comprises the following steps: (1) Modification of basic materials: zeolite, ceramsite, quartz sand and fly ash were mixed with 30% potassium hydroxide solution by mass, stirred at 70°C for 30 min, and naturally air-dried for 2 days for use; lake sediment was collected, naturally air-dried for 12 days, and ground through an 80-mesh sieve to obtain sediment powder for use. The mass-to-volume ratio of zeolite, ceramsite, quartz sand, fly ash and alkaline solution was 10:1 (kg / L); (2) Preparation of adsorbent: Sodium alginate, ZrCl4, and KCl were taken as adsorbent raw materials in a mass ratio of 7:2:4, and then N,N-methylenebisacrylamide and potassium persulfate solution were added, wherein N,N-methylenebisacrylamide accounted for 4% of the mass of the adsorbent raw material, and the volume mass ratio of potassium persulfate solution to adsorbent raw material was 0.4:1 (mL / g). Then, 8% ethanol solution was added, and the above raw materials were mixed and stirred at room temperature for 20 minutes, and the solid was filtered and dried at 40°C for 40 minutes to obtain the adsorbent loaded with Zr and K, which was marked as ZrK@SA; (3) Taking 25 parts of the modified basic material zeolite in step (1), 15 parts of ceramsite, 10 parts of quartz sand, 10 parts of fly ash and 90 parts of lake sediment, 20 parts of ZrK@SA prepared in step (2) and 200 parts of water, stirring them into a slurry, taking 2 parts of sodium dodecylbenzene sulfonate agent and 5 parts of water, and mixing them together to prepare a foam mixture; (4) The entire foam mixture is mixed with the prepared pure slurry and stirred evenly to obtain a foam slurry. Then, 50 parts of cement, 4 parts of a binder enhancer (diethylene glycol, sugar, and propylene glycol in a mass ratio of 1:1:3), and 4 parts of an accelerator (aluminum sulfate, diethanolamine, bentonite, and water in a mass ratio of 40:2:5:40) are mixed with the entire foam slurry, and the mixture is further kneaded into a spherical shape with a diameter of 5 mm and naturally dried.

[0022] Comparative Example 1 The main difference from Example 1 is that the base material of this embodiment does not need to be pretreated by alkalization. A method for preparing a phosphorus-adsorbing artificial wetland filler comprises the following steps: (1) Basic materials: zeolite, ceramsite, quartz sand, and fly ash are prepared for use; lake sediment is collected, naturally air-dried for 12 days, and ground through a 50-mesh sieve to obtain sediment powder for use; (2) Preparation of adsorbent: Sodium alginate, ZrCl4, and KCl were taken as adsorbent raw materials in a mass ratio of 8:1:4, and then N,N-methylenebisacrylamide and potassium persulfate solution were added, wherein the mass ratio of N,N-methylenebisacrylamide to adsorbent raw material was 4%, and the volume mass ratio of potassium persulfate solution to adsorbent raw material was 0.5:1 (mL / g). Then, 6% ethanol solution was added, and the total amount of adsorbent raw material and the mass volume of ethanol solution were 65:100 (kg / L). The above raw materials were mixed and stirred at room temperature for 20 minutes, and the solid was filtered and dried at 40°C for 30 minutes to obtain the adsorbent loaded with Zr and K, which was marked as ZrK@SA; (3) Taking 20 parts of zeolite, 20 parts of ceramsite, 20 parts of quartz sand, 20 parts of fly ash and 100 parts of lake sediment as the basic materials in step (1), 20 parts of ZrK@SA prepared in step (2) and 200 parts of water, stirring them into a slurry, taking 2 parts of sodium dodecylbenzene sulfonate and 5 parts of water, and mixing them together to prepare a foam mixture; (4) The entire foam mixture is mixed with the prepared slurry and stirred evenly to obtain a foam slurry. Then, 30 parts of cement, 3 parts of a binder enhancer (diethylene glycol, sugar, and propylene glycol in a mass ratio of 1:1:3), and 4 parts of an accelerator (aluminum sulfate, diethanolamine, bentonite, and water in a mass ratio of 40:2:5:40) are mixed with the entire foam slurry, and the mixture is further kneaded into a spherical shape with a diameter of 3 mm and naturally dried.

[0023] Comparative Example 2 The main difference from Example 2 is that no adsorbent is used separately in this embodiment. A method for preparing an artificial wetland filler for adsorbing phosphorus comprises the following steps: (1) Modification of basic materials: zeolite, ceramsite, quartz sand and fly ash were mixed with 30% sodium hydroxide solution by mass, stirred at 70°C for 30 min, and naturally air-dried for 2 days for use; lake sediment was collected, naturally air-dried for 12 days, and ground through a 60-mesh sieve to obtain sediment powder for use. The mass-to-volume ratio of zeolite, ceramsite, quartz sand, fly ash and sodium hydroxide solution was 100:5 (kg / L); (2) Taking 30 parts by mass of the modified basic material zeolite in step (1), 10 parts by mass of ceramsite, 15 parts by mass of quartz sand, 20 parts by mass of fly ash, 80 parts by mass of lake sediment and 300 parts by mass of water, stirring them into a slurry, taking 2 parts by mass of sodium dodecylbenzene sulfonate and 5 parts by mass of water, mixing and stirring to prepare a foam mixture; (3) The entire foam mixture is mixed with the prepared pure slurry and stirred evenly to obtain a foam slurry. Then, 40 parts of cement, 3 parts of a binder enhancer (diethylene glycol, sugar, and propylene glycol in a mass ratio of 1:1:3), and 4 parts of an accelerator (aluminum sulfate, diethanolamine, bentonite, and water in a mass ratio of 50:3:5:45) are mixed with the entire foam slurry, and the mixture is further kneaded into a spherical shape with a diameter of 4 mm and naturally dried.

[0024] Comparative Example 3 The main difference from Example 3 is that this embodiment does not use additional foaming agent and accelerating setting agent. A method for preparing an artificial wetland filler for adsorbing phosphorus comprises the following steps: (1) Modification of basic materials: zeolite, ceramsite, quartz sand and fly ash were mixed with 30% potassium hydroxide solution by mass, stirred at 70°C for 30 min, and naturally air-dried for 2 days for use; lake sediment was collected, naturally air-dried for 12 days, and ground through an 80-mesh sieve to obtain sediment powder for use. The mass-to-volume ratio of zeolite, ceramsite, quartz sand, fly ash and alkaline solution was 10:1 (kg / L); (2) Preparation of adsorbent: Sodium alginate, ZrCl4, and KCl were taken as adsorbent raw materials in a mass ratio of 7:2:4, and then N,N-methylenebisacrylamide and potassium persulfate solution were added, wherein the mass ratio of N,N-methylenebisacrylamide to adsorbent raw materials was 4%, and the volume mass ratio of potassium persulfate solution to adsorbent raw materials was 0.4:1 (mL / g). Then, 8% ethanol solution was added, and the above raw materials were mixed and stirred at room temperature for 20 minutes. The solid was filtered and dried at 40°C for 40 minutes to obtain the adsorbent loaded with Zr and K, which was marked as ZrK@SA; (3) Taking 25 parts of the modified basic material zeolite in step (1), 15 parts of ceramsite, 10 parts of quartz sand, 10 parts of fly ash and 90 parts of lake sediment, 20 parts of ZrK@SA prepared in step (2) and 200 parts of water, by weight, and stirring them into a slurry; (4) Mix 50 parts of cement and 4 parts of a binder enhancer (diethylene glycol, starch syrup, and propylene glycol in a mass ratio of 1:1:3) with all the above slurry, further knead it into a spherical shape with a diameter of 5 mm and dry it naturally.

[0025] By subjecting the fillers prepared in Examples 1-3 and Comparative Examples 1-3 to SEM observation, it can be found that the fillers prepared in Examples 1-3 and Comparative Example 2 have high surface roughness and more developed pore structures, while the fillers prepared in Comparative Examples 1 and 3 have low surface roughness and small pore structures.

[0026] The P adsorption performance of the fillers prepared in Examples 1-3 and Comparative Examples 1-3 was further verified according to the following method: The detection method is as follows: the addition amount of the artificial wetland filler in each embodiment is 250 mg, the volume of the solution is 30 mL, the pH value of the solution is 7, the initial total phosphorus concentration is set to 0.5 mg / L, 1 mg / L, and 1.5 mg / L, respectively, and placed in a constant temperature shaking box at 160 rad / min, shaken for 18 hours, and then filtered, and the total phosphorus concentration of the filtrate is measured by malachite green-phosphomolybdic acid spectrophotometry, and then the removal rate of the filler for total phosphorus is calculated and recorded in Table 1. Total phosphorus removal rate = (initial total phosphorus concentration-final total phosphorus concentration) / initial total phosphorus concentration.

[0027] Table 1 Basic data record table for adsorption P performance verification

[0028] The test data in the above table show that the fillers prepared in Examples 1-3 can effectively remove phosphorus, and the phosphorus removal effect reaches more than 95%. Compared with the fillers prepared in Examples 1-3, the phosphorus removal effect is reduced, indicating that whether the basic fillers are pre-treated with alkali solution, the adsorbent, and the use of foaming agent and accelerator have a direct impact on the phosphorus removal effect of the prepared artificial filler, which further verifies and illustrates the beneficial effects of the technical solution described in the present invention. The basic fillers used in the present invention are all pre-treated with alkali solution in advance. This step can realize the enrichment of -OH in the basic filler. This step can not only realize that the negatively charged phosphate can be adsorbed by anion exchange with the surface of the filler, but also this step can effectively promote the effective and close adsorption of the adsorbent with the basic filler in the later process steps, and can increase the surface roughness of the basic filler. In addition, the present invention innovatively develops ZrK@SA adsorbent as the core raw material of the filler, and Al in the filler 3+ and Zr3+ The metal cations react with the soluble P compounds to form insoluble phosphate precipitates. In addition, the disclosed solution of the present invention uses a combination of a foaming agent and an accelerating setting agent. The bubble material produced by the foaming agent can play the role of a ball in the mixed raw materials, which greatly improves and enhances the workability of the filler, so that the bubble wall contains a large number of tiny pores, further forming an open-cell structure of the open-cell foam filler, increasing the water permeability, and the filler prepared by this method can significantly improve the phosphorus removal effect. Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be covered by the scope of the claims of the present invention.

Claims

1. A method for preparing an artificial wetland filler for adsorbing phosphorus, characterized in that: The steps include: (1) Modification of basic materials: Take zeolite, ceramsite, quartz sand and fly ash and mix them with alkaline solution respectively, stir and react at 60-80℃ for 20-40min, and air dry them for later use; collect lake sediment, air dry it, grind it through a 40-80 mesh sieve, and obtain sediment powder for later use; (2) Preparation of adsorbent: Sodium alginate, ZrCl4, and KCl are taken as adsorbent raw materials in a mass ratio of 5-10:1-3:4, and then N,N-methylenebisacrylamide and potassium persulfate solution are added, wherein N,N-methylenebisacrylamide accounts for 1%-4% of the mass of the adsorbent raw material, and the volume mass ratio of potassium persulfate solution to adsorbent raw material is 0.4-0.5:1 (mL / g). Then, 5-10% ethanol solution is added, and the above raw materials are mixed and stirred at room temperature for 20-30 minutes, and the solid is filtered and dried at 40-50°C to obtain the adsorbent loaded with Zr and K, which is marked as ZrK@SA; (3) taking 20-30 parts of the modified basic material zeolite in step (1), 10-20 parts of ceramsite, 10-20 parts of quartz sand, 10-20 parts of fly ash and 80-100 parts of lake sediment, 10-20 parts of the ZrK@SA prepared in step (2) and 200-300 parts of water, stirring them into a slurry, taking 1-2 parts of a foaming agent and making foam with the foaming agent; (4) The foam is mixed with the slurry prepared in step (3) and stirred evenly to obtain a foam slurry, and then 30-50 parts of cement, 3-4 parts of a cementing enhancer, and 3-4 parts of an accelerating agent are mixed with the foam slurry, and further kneaded into a ball with a diameter of 2-5 mm and dried or naturally dried.

2. The method for preparing a phosphorus-adsorbing artificial wetland filler according to claim 1, characterized in that: The alkaline solution in step (1) is one or more of sodium hydroxide, potassium hydroxide or calcium hydroxide, with a mass fraction of 20-40%.

3. The method for preparing a phosphorus-adsorbing artificial wetland filler according to claim 1, characterized in that: In step (1), the mass volume ratio of the zeolite, ceramsite, quartz sand, fly ash and alkaline solution is 100:5-10 (kg / L).

4. The method for preparing a phosphorus-adsorbing artificial wetland filler according to claim 1, characterized in that: In step (2), the mass ratio of sodium alginate, ZrCl4 and KCl is 8:1:

4.

5. The method for preparing a phosphorus-adsorbing artificial wetland filler according to claim 1, characterized in that: In step (2), the total amount of the adsorbent raw material and the mass volume of the ethanol solution are 61-80:100 (kg / L).

6. The method for preparing a phosphorus-adsorbing artificial wetland filler according to claim 1, characterized in that: The foaming agent in step (3) is sodium dodecylbenzene sulfonate.

7. The method for preparing a phosphorus-adsorbing artificial wetland filler according to claim 1, characterized in that: The cementing enhancer is composed of diethylene glycol, starch syrup and propylene glycol in a mass ratio of 1:1:

3.

8. The method for preparing a phosphorus-adsorbing artificial wetland filler according to claim 1, characterized in that: The accelerating setting agent is composed of 40-50 parts of aluminum sulfate, 2-3 parts of diethanolamine, 5-10 parts of bentonite and 40-45 parts of water in parts by mass.

9. An artificial wetland filler prepared according to the method according to any one of claims 1 to 8.

10. Use of the artificial wetland filler according to claim 9 as a water treatment material.

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