Preparation, application and regeneration method of reproducible phosphorus removal fast separation ball

Abstract

The invention provides a preparation method, an application and a regeneration method of a reproducible phosphorus removal fast separation ball. The preparation method of the reproducible phosphorus removal rapid separation ball comprises the following steps: S1, modifying pelelith to obtain modified pelelith; s2, soaking the modified pelelith in a rare metal solution, adjusting the pH to 10.0-11.0 and the temperature to 60-70 DEG C, stirring and soaking for 20-30 hours, washing with deionized water until the pelelith is neutral, and drying to obtain negative lanthanum pelelith; and S3, loading the lanthanum-loaded pelelith into the porous suspension ball to obtain the phosphorus removal rapid separation ball. The prepared phosphorus removal rapid separation ball can effectively remove total phosphorus in biochemical effluent, the phosphorus removal adsorption filler capable of being regenerated and desorbed can be obtained in a simple mode, the filler can be repeatedly used and is high in mechanical strength, small in abrasion and easy to operate, generated precipitates and filtrate can be utilized, and the phosphorus removal rapid separation ball has excellent economic benefits.

Description

Technical Field

[0001] The invention belongs to the technical field of water treatment, and in particular relates to a preparation, application and regeneration method of a regenerable phosphorus removal speed separation ball. Background Art

[0002] After the biological effluent from the sewage treatment plant, ammonia nitrogen and COD can often be effectively removed, but total phosphorus is generally difficult to meet the discharge standards. The general biochemical tail water phosphorus removal method has certain limitations. The usual practice is to add phosphorus removal agents for coagulation and sedimentation treatment to enable the effluent to meet the Class A discharge standard, or even lower effluent standards. However, this method requires a large amount of chemicals, which not only increases the cost, but also produces a large amount of sludge. The sludge contains a large amount of phosphorus, which increases the treatment cost and difficulty.

[0003] The phosphorus removal materials prepared by the existing technical solutions are mainly powdered magnetic powder. The developed materials can effectively remove the soluble phosphorus element, but the existing technical solutions are either only in the laboratory stage and have not actually considered how to further implement them during the project implementation, or the recycling process is too lengthy, requiring a long process route, more auxiliary equipment, large initial investment, and difficult operation.

[0004] Therefore, it is necessary to develop a new filler that can effectively remove phosphorus and nitrogen from biochemical tail water while being portable, low-cost, and short in process, and will not produce a large amount of sludge that would cause environmental pollution. Summary of the invention

[0005] The purpose of the present invention is to provide a preparation, application and regeneration method of a renewable phosphorus removal speed-separating ball. The preparation method of the renewable phosphorus removal speed-separating ball is simple. The prepared phosphorus removal speed-separating ball not only has a good phosphorus removal effect, can deeply remove the phosphorus element in biochemical tail water, but also has a certain nitrogen removal effect, and has excellent regeneration. It can be regenerated in a simple way. The regenerated phosphorus removal speed-separating ball can be recycled again, which greatly reduces the cost. Compared with the traditional deep treatment method, the sludge production is small, almost no sludge is produced, and only a small amount of precipitation is produced. The precipitation can also be recycled as fertilizer, which has great economic benefits.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The preparation of the regenerable phosphorus removal speed separation ball comprises the following steps:

[0008] S1. Modifying volcanic rock to obtain modified volcanic rock;

[0009] S2, soaking the modified volcanic rock in a rare metal solution, adjusting the pH to 10.0-11.0, the temperature to 60-70°C, stirring and soaking for 20-30 hours, washing with deionized water to neutrality, and drying to obtain negative lanthanum volcanic rock;

[0010] S3. Load the negative lanthanum volcanic rock into the porous suspension ball to obtain the phosphorus removal fast separation ball.

[0011] Preferably, the volcanic rock has a particle size of 2 to 5 mm, a porosity of 35% to 45%, and a specific surface area of ​​122 to 355 m 2 / g.

[0012] In some preferred embodiments, the volcanic rock is purchased from Beijing Kejingyuan Technology Co., Ltd.

[0013] The preparation method of the modified volcanic rock comprises the following specific steps:

[0014] A1. After washing the surface of the volcanic stone with clean water, dry it at 70-80°C to constant weight, soak it in a 4%-6% sodium hydroxide aqueous solution for 10-15 hours, take it out, rinse it with deionized water until it is neutral, and vacuum dry it at room temperature for 20-25 hours to obtain the pretreated volcanic stone;

[0015] A2. Put the pretreated volcanic rock into an aqueous solution of ferric chloride, stir it at room temperature for 0.5 to 1 hour, take it out, dry it at room temperature for 20 to 25 hours, and then roast it at 100 to 300°C for 40 to 60 minutes to obtain the product.

[0016] Although volcanic ash is cheap, has a certain pore structure, strong adsorption capacity, and a large specific surface area, it contains many impurities on its surface and in the gaps, resulting in poor ion exchange function, and poor adsorption and removal effects on phosphorus and nitrogen. The inventor found that the selection of specific volcanic rocks and alkali treatment can improve the dephosphorization effect of the phosphorus removal speed ball while improving its denitrification effect. This may be because the alkali treatment of a specific concentration can not only selectively remove silicon from the volcanic rocks, thereby reducing its silicon-aluminum ratio, but also help to improve the ion exchange performance of the volcanic rocks, so that the volcanic rocks can more effectively adsorb and remove nitrogen and phosphorus elements in water. At the same time, the alkali treatment can also form more active groups such as hydroxyl groups on the surface of the volcanic rocks, improving its hydrophilicity and surface activity. In particular, cations such as calcium, iron, and aluminum rich in volcanic rocks are more easily dissolved and precipitated under alkaline conditions, and precipitation reactions occur with phosphate ions to generate insoluble phosphate precipitates that are effectively removed. However, during alkali treatment, the concentration of the alkali should not be too high. Too high a concentration will destroy the structure of the volcanic rocks and affect the adsorption properties of the volcanic rocks. Moreover, the volcanic rock is only treated with alkali, and the obtained product has limited removal of phosphorus and nitrogen.

[0017] Preferably, the concentration of the ferric chloride aqueous solution is 0.1-0.5 mol / L.

[0018] The inventor found that by soaking the pre-treated volcanic rock in an aqueous solution of ferric chloride and then carrying out a roasting treatment, the adsorption of phosphorus and nitrogen by the phosphorus removal speed separation ball can be greatly improved. This may be because the iron ions in the aqueous solution of ferric chloride can adhere to the surface of the volcanic rock on the one hand, forming a film containing iron oxides, not only increasing the surface area of ​​the volcanic rock, but also introducing iron groups with strong adsorption capacity, these groups have good adsorption capacity for phosphorus and nitrogen, on the other hand, high-temperature roasting can further promote the formation and stabilization of iron oxides on the surface of the volcanic rock, making the surface of the volcanic rock more rough, and the pore structure more developed, thereby improving the adsorption performance. At the same time, roasting may also change the crystal structure of the volcanic rock, making it more conducive to the adsorption reaction. Ferric chloride modification provides more iron groups and adsorption sites for the volcanic rock, and the roasting treatment not only further enhances the stability and activity of these sites, but also can change the surface structure and crystal structure of the volcanic rock, making it more conducive to the adsorption reaction, the combination of the two can further improve the adsorption efficiency and selectivity of the volcanic rock, so that the volcanic rock shows better performance in phosphorus and nitrogen removal. However, the concentration of the ferric chloride aqueous solution should not be too high. Too much ferric chloride will easily hydrolyze to form ferric hydroxide to block the pores of the volcanic rock and affect the adsorption effect. At the same time, the roasting temperature should not be too high. Too high a roasting temperature may cause the structure of the volcanic rock to be destroyed.

[0019] Preferably, the rare metal solution is a lanthanum chloride aqueous solution with a concentration of 50 to 80 g / L.

[0020] The inventors found that by soaking the modified volcanic rock in a lanthanum chloride aqueous solution and adjusting the pH to 10.0-11.0, the phosphorus removal effect of the prepared phosphorus removal speed ball can be further improved. This is because the pretreated volcanic rock has an extremely high adsorption effect and can load lanthanum elements, which can react with phosphate ions in the biochemical tail water to form lanthanum phosphate precipitates, thereby achieving the effect of removing phosphorus from the biochemical tail water. Under alkaline conditions, the negative charge on the surface of the volcanic rock may increase, thereby further enhancing its adsorption of positively charged lanthanum ions.

[0021] Preferably, the solution for adjusting pH is aqueous ammonia.

[0022] Preferably, the volume concentration of the ammonia water is 25-28%.

[0023] The inventors have found through many experiments that the alkalinity of the solution by using ammonia water can significantly improve the adsorption capacity, adsorption rate and adsorption stability of the material for phosphate in the water body. This may be because ammonia water is a strong base weak acid salt, and the nitrogen atom in its molecule has a lone pair of electrons, which can form a stable complex with the metal lanthanum ion, and promote the uniform distribution and fixation of lanthanum ions on the surface of volcanic rocks through complexation, which helps to increase the load of lanthanum, reduce the loss of lanthanum ions, and form a uniformly distributed load layer on the surface of volcanic rocks. Thus, the adsorption effect is improved, and then the adsorption of phosphorus in biochemical tail water is improved, and the phosphorus element of biochemical tail water is deeply removed, which effectively alleviates the problem of eutrophication of water bodies. When preparing negative lanthanum volcanic rocks, it is necessary to pay attention to the time of stirring and soaking. Too long a time may cause the material loaded on the surface of the volcanic rocks to undergo local agglomeration, thereby reducing the adsorption sites on the surface and affecting the adsorption effect. However, after the material loaded with lanthanum is used, the lanthanum element thereon may be difficult to fully recover. This has not only caused a waste of resources, but also may cause secondary pollution to the environment.

[0024] The porous suspension balls are not particularly limited and any commercially available ones can be used.

[0025] The phosphorus removal quick-distribution ball prepared by the preparation method.

[0026] The regenerable phosphorus removal quick-distribution ball is applied to biochemical tail water treatment.

[0027] The specific application steps of the regenerable phosphorus removal speed-distributing ball include: placing the phosphorus removal speed-distributing ball in a phosphorus-containing biochemical tailwater filter, the water in the phosphorus removal filter is in the bottom and out the top, and the water is discharged after staying for 20 to 25 minutes.

[0028] The phosphorus concentration in the water is ≤1 mg / L during water inlet and ≤0.2 mg / L during water outlet.

[0029] The regeneration method of the regenerable phosphorus removal speed separation ball comprises:

[0030] B1. When the phosphorus concentration in the water is greater than 0.2 mg / L, take out the negative lanthanum volcanic rock in the phosphorus removal speed separation ball and put it into the regeneration liquid. After stirring for 3 to 5 hours, filter to obtain the regeneration waste liquid and volcanic rock filler, rinse the volcanic rock filler until the pH is neutral, and obtain the regenerated volcanic rock filler. Repeat this step to perform multiple regenerations.

[0031] B2. Add calcium chloride aqueous solution to the regeneration waste liquid to obtain a precipitate, filter it, wash the precipitate with deionized water until it is neutral, dry it, and add alkali to the filtrate to obtain a regeneration liquid.

[0032] Preferably, the regeneration liquid is an aqueous solution of sodium hydroxide.

[0033] Preferably, the concentration of the sodium hydroxide aqueous solution is 2% to 5%.

[0034] Preferably, the precipitation in step B2 is calcium carbonate precipitation.

[0035] Preferably, the specific method of supplementing the alkali to the filtrate in step B2 is: adding alkali to the filtrate until the hydroxide ion concentration in the filtrate is 2% to 5%.

[0036] For traditional negative lanthanum adsorbents, if you want to regenerate them, you generally need to keep them above 1000°C for a period of time under vacuum conditions to decompose lanthanum phosphate at high temperature, but volcanic rocks have poor high temperature resistance and may deform, expand or even burst at high temperatures. The inventors found that placing the negative lanthanum volcanic rocks in the phosphorus speed separation ball after adsorption into a sodium hydroxide aqueous solution of a specific concentration can regenerate the negative lanthanum volcanic rocks, so that they can continue to be used, greatly reducing costs and without the need for high temperature treatment. This may be because sodium hydroxide is a strong base that can ionize many hydroxide ions, which can react with the lanthanum phosphate precipitate to generate lanthanum hydroxide and sodium phosphate, so that the lanthanum phosphate adsorbed on the volcanic rock after the reaction can be desorbed, realizing the regeneration of the phosphorus removal speed separation ball. In addition, the inventors obtained calcium phosphate precipitates by adding calcium chloride aqueous solution to the regenerated waste liquid, which can be recycled as fertilizer after washing to neutrality, and the filtrate is supplemented with alkali to a hydroxide ion concentration of 2% to 5% in the filtrate, which can be reused as a regeneration liquid. Therefore, by adopting the regeneration method of the present application, after simple modification, a regenerable desorption phosphorus removal adsorption filler is obtained. The filler is reusable, has high mechanical strength, low wear, basically does not produce waste liquid, and the regenerated liquid can be continuously regenerated; the sludge production is small, almost no sludge is produced, only a small amount of precipitation is produced, and it can also be used as a fertilizer. The operation is simple and the recovery process is short, which greatly improves the economic benefits.

[0037] Compared with the prior art, the advantages and beneficial effects of the present invention are:

[0038] 1. The present invention provides a preparation, application and regeneration method of a renewable phosphorus removal speed-separating ball. The prepared phosphorus removal speed-separating ball not only has a good phosphorus removal effect, can deeply remove the phosphorus element in biochemical tail water, but also has a certain nitrogen removal effect and excellent regeneration. It can be regenerated in a simple way. The regenerated phosphorus removal speed-separating ball can be recycled again, which greatly reduces the cost. Compared with the traditional deep treatment method, the sludge production is small, almost no sludge is produced, and only a small amount of precipitation is produced. The precipitation can also be recycled as fertilizer, which has great economic benefits.

[0039] 2. The present invention selects specific volcanic rocks and performs alkali treatment on them, which can improve the phosphorus removal effect of the phosphorus removal speed separation ball while also improving its denitrification effect.

[0040] 3. The present invention can greatly increase the adsorption capacity of phosphorus and nitrogen by the phosphorus removal speed separation ball by soaking the pretreated volcanic rock in an aqueous solution of ferric chloride and then performing a roasting treatment.

[0041] 4. The present invention can further improve the phosphorus removal effect of the prepared phosphorus removal speed ball by soaking the modified volcanic rock in a lanthanum chloride aqueous solution and adjusting the pH to 10.0-11.0.

[0042] 5. The present invention uses ammonia water to adjust the solution to be alkaline, which can significantly improve the material's adsorption capacity, adsorption rate and adsorption stability for phosphate in water.

[0043] 6. The present application places the negative lanthanum volcanic rock in the phosphorus speed separation ball after adsorption into a sodium hydroxide aqueous solution of a specific concentration, which can regenerate the negative lanthanum volcanic rock so that it can continue to be used, greatly reducing the cost.

[0044] 7. The present invention adds calcium chloride aqueous solution to the regeneration waste liquid to obtain calcium phosphate precipitate, which can be recycled as fertilizer after washing to neutrality, and the filtrate is supplemented with alkali until the hydroxide ion concentration in the filtrate is 2% to 5%, which can be reused as regeneration liquid. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] The raw materials used in the present invention are all commercially available, specifically:

[0047] Volcanic rock, particle size is 2-5 mm, porosity is 35%-45%, specific surface area is 122-355 m 2 / g, purchased from Beijing Kejingyuan Technology Co., Ltd.

[0048] Example 1

[0049] This embodiment provides a method for preparing a regenerable phosphorus removal speed-distributing ball, the steps of which are:

[0050] S1. Modifying volcanic rock to obtain modified volcanic rock;

[0051] S2, soaking the modified volcanic rock in a rare metal solution, adjusting the pH to 10.0, the temperature to 65°C, stirring and soaking for 25 hours, washing with deionized water to neutrality, and drying to obtain negative lanthanum volcanic rock;

[0052] S3. Load the negative lanthanum volcanic rock into the porous suspension ball to obtain the phosphorus removal fast separation ball.

[0053] The preparation method of the modified volcanic rock comprises the following specific steps:

[0054] A1. After washing the surface of the volcanic stone with clean water, dry it at 75°C to constant weight, soak it in a 5% sodium hydroxide aqueous solution for 13 hours, take it out, rinse it with deionized water until it is neutral, and vacuum dry it at room temperature for 22 hours to obtain the pretreated volcanic stone;

[0055] A2. Put the pretreated volcanic rock into an aqueous solution of ferric chloride, stir it at room temperature for 1 hour, take it out, dry it at room temperature for 22 hours, and then roast it at 200°C for 50 minutes to obtain the product.

[0056] The concentration of the ferric chloride aqueous solution is 0.3 mol / L.

[0057] The rare metal solution is a lanthanum chloride aqueous solution with a concentration of 65 g / L.

[0058] The solution for adjusting pH is aqueous ammonia.

[0059] The volume concentration of the ammonia water is 27%.

[0060] The regeneration method of the regenerable phosphorus removal speed-distributing ball comprises the following steps:

[0061] B1. When the phosphorus concentration in the water is greater than 0.2 mg / L, take out the negative lanthanum volcanic rock in the phosphorus removal speed separation ball and put it into the regeneration liquid. After stirring for 4 hours, filter to obtain the regenerated waste liquid and volcanic rock filler, rinse the volcanic rock filler until the pH is neutral, and obtain the regenerated volcanic rock filler. Repeat this step five times;

[0062] B2. Add calcium chloride aqueous solution to the regeneration waste liquid to obtain a precipitate, filter it, wash the precipitate with deionized water until it is neutral, dry it, and add alkali to the filtrate to obtain a regeneration liquid.

[0063] The regeneration liquid is a sodium hydroxide aqueous solution, and the concentration of the sodium hydroxide aqueous solution is 4%.

[0064] The specific method of supplementing the filtrate with alkali in step B2 is: adding alkali to the filtrate until the hydroxide ion concentration in the filtrate is 4%.

[0065] Example 2

[0066] The difference between this embodiment and embodiment 1 is: S2, soaking the modified volcanic rock in a rare metal solution, adjusting the pH to 11.0, the temperature to 65°C, stirring and soaking for 25 hours, washing with deionized water to neutrality, and drying to obtain the negative lanthanum volcanic rock.

[0067] Example 3

[0068] The difference between this embodiment and embodiment 1 is that the rare metal solution is a lanthanum chloride aqueous solution with a concentration of 80 g / L.

[0069] Comparative Example 1

[0070] The difference between this comparative example and Example 1 is as follows: A1. After washing the surface of the volcanic rock with clean water, dry it at 75°C to constant weight, soak it in a 10% sodium hydroxide aqueous solution for 13 hours, take it out, rinse it with deionized water until it is neutral, and vacuum dry it at room temperature for 22 hours to obtain the pretreated volcanic rock.

[0071] Comparative Example 2

[0072] The difference between this comparative example and Example 1 is that the concentration of the ferric chloride aqueous solution is 1 mol / L.

[0073] Comparative Example 3

[0074] The difference between this comparative example and Example 1 is as follows: A2, the pretreated volcanic rock is placed in an aqueous solution of ferric chloride, stirred at room temperature for 1 hour, taken out, dried at room temperature for 22 hours, and then calcined at 500° C. for 50 minutes to obtain.

[0075] Comparative Example 4

[0076] The difference between this comparative example and Example 1 is as follows: A2, the pretreated volcanic rock is placed in an aqueous solution of ferric chloride, stirred at room temperature for 1 hour, taken out, and dried at room temperature for 22 hours to obtain.

[0077] Comparative Example 5

[0078] The difference between this comparative example and Example 1 is: S2, soaking the modified volcanic rock in a rare metal solution at a temperature of 65° C., stirring and soaking for 25 hours, washing with deionized water until neutral, and drying to obtain negative lanthanum volcanic rock.

[0079] Comparative Example 6

[0080] The difference between this comparative example and Example 1 is that the solution for adjusting pH is a sodium hydroxide aqueous solution.

[0081] The concentration of the sodium hydroxide aqueous solution is 5%.

[0082] Comparative Example 7

[0083] The difference between this comparative example and Example 1 is: S2, soaking the modified volcanic rock in a rare metal solution, adjusting the pH to 10.0, the temperature to 65°C, stirring and soaking for 40 hours, washing with deionized water to neutrality, and drying to obtain negative lanthanum volcanic rock.

[0084] Comparative Example 8

[0085] The difference between this comparative example and Example 1 is that the regeneration liquid is a sodium hydroxide aqueous solution with a concentration of 1%.

[0086] Performance Testing

[0087] After drawing a standard curve with reference to the method in the paper "Preparation of Modified Carbon Nanotube Materials and Study on Phosphorus Removal by Adsorption" published by Dai Shiyu, the adsorption amount and phosphorus removal rate of phosphorus were tested. Adsorption amount (mg / g) = (phosphorus mass concentration in the initial solution - phosphorus mass concentration in the final solution) × solution volume / adsorbent mass; phosphorus removal rate (%) = (phosphorus mass concentration in the initial solution - phosphorus mass concentration in the final solution) / phosphorus mass concentration in the initial solution × 100%.

[0088] For the regenerated volcanic rock filler, the regeneration efficiency was tested, and the regeneration efficiency (%) = the amount of phosphorus adsorbed after regeneration / the amount of phosphorus adsorbed in the initial state × 100%.

[0089] The results are shown in Table 1.

[0090] Table 1 Measurement results

[0091] Adsorption amount / (mg / g) Phosphorus removal rate / % Regeneration efficiency / % Example 1 150.8 99.3 88.5 Example 2 149.5 98.9 87.8 Example 3 150.3 99.4 89.1 Comparative Example 1 137.6 92.0 80.5 Comparative Example 2 143.1 93.4 83.2 Comparative Example 3 139.8 92.5 81.7 Comparative Example 4 128.7 87.5 73.1 Comparative Example 5 138.5 91.7 80.9 Comparative Example 6 141.8 92.4 82.2 Comparative Example 7 142.9 92.8 82.7 Comparative Example 8 150.8 99.3 84.2

[0092] According to statistics, the regenerable phosphorus removal speed-separating balls prepared in Examples 1 to 3 of the present invention and subjected to regeneration treatment have high phosphorus adsorption capacity and adsorption rate, and the regeneration efficiency reaches more than 85% after five regenerations. In Comparative Example 1, the sodium hydroxide aqueous solution was too high during the pretreatment of the volcanic rock; in Comparative Example 2, the concentration of the ferric chloride aqueous solution was too high; in Comparative Example 3, the roasting temperature was too high; in Comparative Example 4, the roasting step was not performed; in Comparative Example 5, the pH was not adjusted; in Comparative Example 6, the solution for adjusting the pH was a sodium hydroxide aqueous solution; in Comparative Example 7, the stirring and soaking time was too long; in Comparative Example 8, the concentration of the regenerated liquid was too low; the adsorption capacity and adsorption rate of the prepared phosphorus removal speed separation ball were both low, and the regeneration efficiency after regeneration was poor. Therefore, the regenerable phosphorus removal speed separation ball prepared by the method described in the present application not only has a good phosphorus removal effect, can deeply remove the phosphorus element from the biochemical tail water, but also has a certain nitrogen removal effect, and has excellent regeneration, can be regenerated in a simple manner, and the regenerated phosphorus removal speed separation ball can be recycled again, which greatly reduces the cost. Compared with the traditional deep treatment method, the sludge production is small, almost no sludge is produced, and only a small amount of precipitation is produced. The precipitation can also be recycled as fertilizer, which has great economic benefits.

[0093] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A preparation of a regenerable phosphorus removal speed ball, characterized in that: The method comprises the following steps: S1, modifying volcanic rock to obtain modified volcanic rock; S2, soaking the modified volcanic rock in a rare metal solution, adjusting the pH to 10.0-11.0, the temperature to 60-70°C, stirring and soaking for 20-30 hours, washing with deionized water to neutrality, and drying to obtain negative lanthanum volcanic rock; S3, loading the negative lanthanum volcanic rock into the porous suspension ball to obtain the phosphorus removal speed separation ball; The volcanic rock has a particle size of 2 to 5 mm, a porosity of 35% to 45%, and a specific surface area of ​​122 to 355 m 2 / g; The preparation method of the modified volcanic rock comprises the following steps: A1. After washing the surface of the volcanic stone with clean water, dry it at 70-80°C to constant weight, soak it in a 4%-6% sodium hydroxide aqueous solution for 10-15 hours, take it out, rinse it with deionized water until it is neutral, and vacuum dry it at room temperature for 20-25 hours to obtain the pretreated volcanic stone; A2. Put the pretreated volcanic rock into an aqueous solution of ferric chloride, stir it at room temperature for 0.5 to 1 hour, take it out, dry it at room temperature for 20 to 25 hours, and then roast it at 100 to 300°C for 40 to 60 minutes to obtain; The rare metal solution is a lanthanum chloride aqueous solution with a concentration of 50 to 80 g / L.

2. The preparation of the regenerable phosphorus removal speed-distributing ball according to claim 1 is characterized in that: The concentration of the ferric chloride aqueous solution is 0.1-0.5 mol / L.

3. The preparation of the regenerable phosphorus removal speed-distributing ball according to claim 1 is characterized in that: The solution for adjusting pH is ammonia water, and the volume concentration of the ammonia water is 25-28%.

4. A regenerable phosphorus removal speed-distributing ball prepared according to any one of claims 1 to 3.

5. An application of the regenerable phosphorus removal speed-distributing ball according to claim 4, characterized in that: Applied to biochemical tail water treatment.

6. The use according to claim 5, characterized in that: The specific application steps are: place the phosphorus removal speed separation ball in the phosphorus-containing biochemical tailwater filter, the water in the phosphorus removal filter is in the bottom and out the top, and the water is discharged after staying for 20 to 25 minutes.

7. A method for regenerating the regenerable phosphorus removal speed-distributing ball according to claim 4, characterized in that: The steps include: B1. When the phosphorus concentration in the water is greater than 0.2 mg / L, take out the negative lanthanum volcanic rock in the phosphorus removal speed separation ball and put it into the regeneration liquid. After stirring for 3 to 5 hours, filter to obtain the regeneration waste liquid and volcanic rock filler, rinse the volcanic rock filler until the pH is neutral, and obtain the regenerated volcanic rock filler. Repeat this step to perform multiple regenerations. B2. Add calcium chloride aqueous solution to the regeneration waste liquid to obtain a precipitate, filter it, wash the precipitate with deionized water until it is neutral, dry it, and add alkali to the filtrate to obtain a regeneration liquid.

8. The regeneration method according to claim 7, characterized in that: The regeneration liquid is a sodium hydroxide aqueous solution.

9. The regeneration method according to claim 8, characterized in that: The concentration of the sodium hydroxide aqueous solution is 2% to 5%.

10. The regeneration method according to claim 7, characterized in that: The specific method of supplementing the filtrate with alkali in step B2 is: adding alkali to the filtrate until the concentration of hydroxide ions in the filtrate is 2% to 5%.