CN106365281B - A kind of water body dephosphorized dose of preparation method and water body dephosphorized method - Google Patents

Abstract

The invention provides a preparation method of a water body phosphorus removal agent and a water body phosphorus removal method. During preparation, waste concrete is first crushed, then activated at a low temperature of 200-300 DEG C for 10-30 minutes, and then the concrete blocks after the low-temperature activation treatment are crushed into The waste concrete powder is screened with a 100-325 mesh sieve, and the undersize is collected to obtain a cementitious matrix. After mixing the cementitious matrix with the surfactant, the ball mill is used for ball milling and activation treatment for 2~10min. The water body phosphorus removal agent is obtained. The water body phosphorus removal method is to add the water body phosphorus removal agent prepared by the method into the water body to be treated to remove the phosphorus element in the water body. The phosphorus removal agent of the invention has the advantages of fast phosphorus removal reaction speed, short phosphorus removal time, high phosphorus removal efficiency and stable phosphorus removal effect, and the phosphorus removal rate can reach more than 99%.

Description

A kind of preparation method of water body phosphorus removal agent and water body phosphorus removal method

technical field

The invention belongs to the technical field of waste concrete resource utilization, and particularly relates to a preparation method of a water body phosphorus removal agent and a water body phosphorus removal method.

Background technique

According to the "China Statistical Yearbook 2004-2013" by the National Bureau of Statistics, the output of construction waste in my country increased rapidly from 297 million tons in 2003 to 1.131 billion tons in 2012. With the acceleration of my country's infrastructure and urbanization construction, the rapid development of urban renovation and construction industry, and the demolition of some old buildings, structures, and urban infrastructure after their service life expires, more and more construction waste will be generated. Xi'an University of Architecture and Technology predicted in the "Research on the Development of Construction Waste Recycling Industry": According to the urbanization rate reaching 60%, by 2020 or so, the output of urban construction waste will reach 2.6 billion tons, and it will reach 7.3 billion tons in 2030. Most of the construction waste is transported by the construction unit to the suburbs for open-air stacking or landfilling, resulting in a series of problems such as increasing load of the muck receiving plant, less and less available stacking area, and higher and higher stacking costs. Therefore, construction waste has become a major public hazard in the city, which not only buried a huge hidden safety hazard, but also brought a great environmental risk, and also caused an extreme waste of resources and land. The data shows that in terms of quantity, waste concrete is an important part of construction waste, accounting for about 34% of the total construction waste, while the utilization rate of waste concrete in my country is less than 5%, and the only part of resource utilization is also more. It focuses on crushing, grading and cleaning waste concrete to recover the sand and gravel aggregates and then use it to prepare recycled aggregate concrete; the main component of waste concrete is also the largest resource and energy consumption and the heaviest environmental load in the concrete production process. , The waste gelling matrix with the highest economic cost has not received enough attention and effective resource utilization.

Although domestic and foreign scholars have made some attempts at resource utilization of cementitious matrix in waste concrete, most of them are concentrated in the field of building materials, and the added value is relatively low, so the interest in resource utilization is not high. For example, the prior art shows that in the field of building materials, there are certain technical problems in the process of using the cementitious matrix in waste concrete to develop cement concrete mixtures or as auxiliary materials to produce hollow bricks, as well as re-grinding and calcining cement. The waste cement stone has large porosity, high standard water demand, low activity index, and poor construction and mechanical properties of building materials prepared with it. At the same time, since the cementitious matrix separated from waste concrete contains a certain amount of inert silica, it also brings difficulties to the grinding of cement raw meal and the calcination of clinker, which increases the content of f-CaO in the clinker and reduces the quality of the clinker. decrease, and production costs increase. At the same time, due to the above reasons, when using the cementitious matrix in waste concrete to prepare related building materials, there is a certain limit dosage, and the utilization rate is relatively low. In summary, the cementitious matrix in waste concrete is not suitable for recycling as a building material.

Phosphorus is an important element in the ecosystem, and various phosphorus-containing compounds play an important role in human industrial and agricultural production and daily life, but at the same time, a large amount of phosphorus-containing wastewater is discharged into natural water bodies, and phosphorus is in the water body. Enrichment is an important cause of water eutrophication, which seriously threatens the balance of water ecosystems and causes great environmental problems. It should be pointed out that phosphorus is a non-renewable resource. Without the active intervention of human beings, the flow of phosphorus in nature is one-way. Land currents eventually enter the ocean. It is estimated that the phosphate rock that can be economically mined on Earth will be exhausted within 50 to 100 years. In order to cope with the situation of continuous depletion of phosphorus resources, it can be seen from the three international conferences on phosphorus recovery held abroad that the current international research focus is how to better remove and recover phosphorus resources from phosphorus-containing water bodies, so as to improve phosphorus Therefore, the contradiction between the increasing scarcity of phosphorus mineral resources and the eutrophication caused by the continuous increase of phosphorus content in water bodies can be alleviated.

In recent years, with the continuous development and innovation of technology, some new phosphorus removal and phosphorus recovery technologies, such as electrolysis, reverse osmosis, and ion exchange, have been steadily developed. However, due to the advantages of traditional chemical precipitation, crystallization, adsorption, etc., which can achieve a relatively high removal and recovery rate, and the process is mature and stable, easy to achieve automatic control, low cost, easy to treat high-concentration phosphorus-containing wastewater and other advantages, it is still widely used at home and abroad. It is used as a better means of phosphorus removal and phosphorus recovery. However, in this process, the most studied and used precipitants, seeds or adsorbents are mainly Ca(OH) ₂ , CaO, CaCl ₂ , limestone, tobermorite, hydrous aluminosilicate and other compounds. Phosphorus removal materials often need to be artificially synthesized through complex processes after mining natural ores. This process may not only cause damage to the ecological environment, but also consume a lot of energy and resources, and there are certain shortcomings.

SUMMARY OF THE INVENTION

In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: for the existing precipitants, crystal seeds or adsorbents for phosphorus removal, it is often necessary to mine ores and then artificially synthesize them through complex processes, destroying the ecological environment and consuming a large amount of Energy and resources, and the technical problem that the cementitious matrix in the waste concrete is not well recycled in the prior art, but a preparation method of a water body phosphorus removal agent using the cementitious matrix separated from the waste concrete as the main raw material is provided.

Another object of the present invention is to provide a method for removing phosphorus from water.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions: a preparation method of a phosphorus removal agent for water bodies, comprising the following steps:

1) Crush the waste concrete into waste concrete blocks with a particle size of less than 25 mm, and activate the waste concrete blocks at a low temperature of 200-300 °C for 10-30 minutes;

2) pulverizing the waste concrete blocks after the low-temperature activation treatment in step 1) to obtain waste concrete powder, sieving the waste concrete powder with a 100-325 mesh sieve, and collecting the undersize to obtain a hardened gel matrix;

3) The hardened gel matrix obtained in step 2) is mixed with a surfactant to obtain a mixed raw material, and the mixed raw material is subjected to ball milling activation treatment for 2-10 min by a ball mill to obtain the water body phosphorus removal agent.

A method for removing phosphorus from a water body, adding the water body phosphorus removing agent prepared by the method into the water body to be treated to remove the phosphorus element in the water body to be treated; wherein, the water body phosphorus removing agent and the quality of the water body to be treated The volume ratio is 0.3~10 g:1000 mL.

Compared with the prior art, the present invention has the following beneficial effects:

1. The present invention separates the cementitious matrix from the waste concrete and uses it for the activation reaction to prepare the water body dephosphorization agent. The present invention first roughly crushes the waste concrete and then uses a muffle furnace for low-temperature activation treatment to reduce the hardening of the cementitious matrix in the waste concrete. The binding force with the aggregate is then separated by electromagnetic vibration and sieving to obtain a hardened gel body, and the hardened gel body and the surfactant are subjected to mechanical ball milling activation treatment to obtain a water phosphorus removal agent. After the above-mentioned "crushing-low-temperature activation-electromagnetic separation-mechanical screening", the calcium-containing cement hydration product C-S-H gel with high energy consumption and high economic value in waste concrete can be separated, and added surfactant and ball-milled to increase the size In order to separate the specific surface area of the obtained C-S-H gel and the dissolution ability of calcium, the prepared phosphorus removal agent has an ideal phosphorus removal ability.

2. The present invention utilizes the cementitious matrix in waste concrete to prepare a phosphorus removal agent for water body and applies it to the removal of phosphorus elements in phosphorus-containing water bodies. The main phosphorus removal mechanism lies in the following two points:

1) The main component of the prepared water phosphorus removal agent is C-S-H gel containing cement hydration product in waste concrete, which has excellent calcium dissolving ability after being treated by the above physical and chemical means, and the dissolved calcium ions combine with phosphate ions in water to form Calcium phosphate compound; it is separated and removed by filtration.

2) The prepared water phosphorus removal agent itself is a porous structure material with a large surface area. The calcium ions and hydroxide ions released by the prepared water body make the phosphorus-containing water body reach a certain alkalinity (above pH 8), and at the same time, the calcium concentration reaches saturation. Therefore, it can absorb the phosphate ions in the solution and form a favorable microenvironment on the local surface of the phosphorus remover that can crystallize, precipitate and grow calcium phosphate, so that the phosphate is wrapped on the surface of the phosphorus remover, and then filtered from the water body. separated and removed.

The phosphorus removal agent prepared by the invention has the advantages of fast phosphorus removal reaction speed, short phosphorus removal time, high phosphorus removal efficiency and stable phosphorus removal effect, and the phosphorus removal rate can reach more than 99%. Not only that, the phosphorus removal reaction using the water phosphorus removal agent of the present invention has a wide reaction temperature range and can be performed at room temperature, has fewer restrictions on reaction conditions, is easier to operate, and saves energy.

3. The present invention also creatively performs a hydrothermal reaction on the hardened cementitious matrix, and further reacts calcium oxide and silicon dioxide in the waste concrete after the hydrothermal reaction treatment, thereby reducing the subsequent use of the prepared phosphorus removal agent for water removal. The amount of calcium dissolved in the water body during the phosphorus removal process makes the pH of the effluent water after phosphorus removal not increase much, reduces the amount of acid in the pH adjustment process of the water body after phosphorus removal, and makes the pH value of the phosphorus removal reaction environment more stable , to ensure the phosphorus removal efficiency.

4. The raw material used in the water phosphorus removal agent of the present invention is mainly the cementitious matrix in waste concrete, which does not require complex balanced re-batching, the preparation process is simple, the requirements for equipment conditions are low, and it is easy to realize industrial production.

5. The phosphorus removal agent prepared by the method of the present invention is environmentally friendly, and there is no secondary environmental pollution problem in the process of phosphorus removal from water bodies, which conforms to the national policy orientation of the development of green economy and circular economy.

6. The present invention provides a new approach and method for the resource utilization of hardened gel in waste concrete, and improves the utilization value of waste concrete. The treatment of phosphorus-containing water bodies such as rivers, lakes, industrial and domestic wastewater provides a new material with a wide range of sources, cheap and easy to obtain, low energy consumption, and green environmental protection. The technical method can effectively avoid the eutrophication phenomenon of slow-flowing natural water bodies such as lakes, rivers and bays, as well as the phosphorus-containing waste water produced in the process of human industrial and agricultural production and daily life, by using the phosphorus removing agent of the invention. It has a good application prospect for the purpose of the occurrence of the crisis of the water ecosystem caused by the change.

Description of drawings

Fig. 1 is the influence of the different dosages of the water body phosphorus removing agent prepared in Example 1 on the water body phosphorus removal effect;

Figure 2 shows the effect of stirring rate on phosphorus removal from water;

Fig. 3 is the influence of phosphorus removal reaction time on water body phosphorus removal effect;

Figure 4 shows the effect of phosphorus removal reaction temperature on phosphorus removal effect.

Detailed ways

The present invention will be further described in detail below in conjunction with specific embodiments. This example is implemented on the premise of the technology of the present invention. Now, the detailed implementation and specific operation process are given to illustrate the inventiveness of the present invention, but the protection scope of the present invention is not limited to the following examples.

Example 1:

A preparation method of a water body dephosphorization agent, comprising the steps:

1) Crush the waste concrete into waste concrete blocks with a particle size of less than 25 mm with a jaw crusher, and activate the waste concrete blocks at a low temperature of 300 ° C for 20 minutes;

2) The waste concrete blocks after the low-temperature activation treatment in step 1) are pulverized by an electromagnetic vibrating pulverizer for 10 seconds to obtain waste concrete powder. 2.36, 4.75, 9.5mm standard sand and gravel sieves are used to mechanically screen the waste concrete powder to remove the coarse aggregate particles in the waste concrete powder, and collect the under-sieve to obtain a hardened gel matrix;

3) After the hardened gel matrix obtained in step 2) and the surfactant triethanolamine are put into a vacuum ball milling tank for mixing, and a planetary ball mill is used for ball milling activation treatment for 5 min to obtain the water body phosphorus removal agent; wherein, The mass ratio of the gel matrix to the surfactant is 1000:3.

A method for removing phosphorus from a water body, the water body phosphorus removing agent prepared in this embodiment is added into the water body to be treated to remove the phosphorus element in the water body to be treated, and specifically the dosage of the water body phosphorus removing agent in the phosphorus removal process, The stirring rate, stirring phosphorus removal time and reaction temperature were studied as follows:

1. In the phosphorus removal process, the dosage of the phosphorus removal agent prepared by the present embodiment is investigated:

1) Use KH ₂ PO ₄ to prepare a phosphorus-containing wastewater simulant with an initial phosphorus concentration of 20 mg/L (in terms of P mass concentration), take a series of 250 mL beakers, and add 100 mL of the prepared phosphorus-containing wastewater simulating solution in turn. Place the beaker on a magnetic stirrer.

2) With 20 mg as the initial concentration and 20 mg as the mass gradient, the phosphorus removal agent prepared in this example of different masses was added to the above-mentioned beaker containing the phosphorus-containing wastewater simulation solution in turn, and the control group did not add it. At room temperature, it was treated with a stirring intensity of 100 r/min for 60 min.

3) After removing the beaker and standing for a while and suction filtration, use a micropipette to take the filtrate in each beaker in turn into a colorimetric tube, dilute with distilled water, and add a mixture of sulfuric acid, antimony potassium tartrate, ammonium molybdate and ascorbic acid. Reagent, shake well and let stand for 10min. Using distilled water as a blank reference, the absorbance of the filtrate was measured at a wavelength of 880 nm with a visible spectrophotometer to evaluate the phosphorus removal effect of different dosages of phosphorus removal agents. The experimental results are shown in Figure 1.

It can be seen from Figure 1 that with the increase of the prepared phosphorus removal dosage, the phosphorus concentration in the effluent drops linearly. When the dosage reaches 0.3 g, the phosphorus concentration in the water decreases from 20 mg/L to below 2 mg/L, which has reached the relevant national emission standards. ; Increase the dosage of the phosphorus remover and the phosphorus concentration remains basically unchanged. Under the same experimental conditions, the results of the three experiments (lines a1, a2, and a3 in Figure 1) have good repeatability. It can be seen that the C-S-H gel water phosphorus removal agent separated and prepared in this example has ideal water phosphorus removal and Phosphorus recovery effect, and the phosphorus removal process is stable, the optimal dosage of phosphorus removal agent is 0.05~1g.

2. Investigate the stirring rate in the process of phosphorus removal:

Take seven 250mL beakers, respectively pipette 100mL of prepared 20mg/L simulated phosphorus-containing wastewater into the beakers, place the beakers on a magnetic stirrer, and add 0.50 g of phosphorus removal agent to the seven beakers in turn. At room temperature of 25 °C, the reaction was carried out for 60 min with a magnetic stirrer at the rotational speeds of 60 r/min, 80 r/min, 100 r/min, 120 r/min, 140 r/min, 160 r/min, and 180 r/min, respectively. The resulting water was diluted, and a mixed reagent consisting of sulfuric acid, antimony potassium tartrate, ammonium molybdate and ascorbic acid was added, shaken and left for 10 minutes, and distilled water was used as a blank control to measure the absorbance of the filtrate at a wavelength of 880 nm with a visible spectrophotometer. To evaluate the phosphorus removal effect of the phosphorus remover under different stirring intensities, the experimental results are shown in Figure 2.

It can be seen from Figure 2 that under certain conditions of other factors, with the increase of stirring intensity, the phosphorus concentration in the effluent decreases linearly. When the stirring speed reaches 140r/min, the phosphorus concentration in the effluent decreases to the lowest level, and continues to increase the stirring intensity. It fluctuates slightly, and basically does not change, and the three parallel experiments (lines a1, a2, and a3 in Figure 2) have good repeatability, indicating that the optimal stirring intensity is 140 r/min.

3. The influence of phosphorus removal time:

Take seven 250mL beakers, respectively pipette 100mL of prepared simulated phosphorus-containing wastewater with a concentration of 20mg/L into the beakers, place the beakers on a magnetic stirrer, and add 0.50 g of phosphorus removal agent to the seven beakers in turn. Under the condition of the magnetic stirrer rotating speed of 140 r/min at room temperature and 25 ℃, the phosphorus removal time of phosphorus-containing wastewater in seven beakers was set as 5min, 15min, 30min, 45min, 60min, 75min and 90min respectively to carry out the phosphorus removal reaction. After the end, the treated water was diluted, and a mixed reagent consisting of sulfuric acid, antimony potassium tartrate, ammonium molybdate and ascorbic acid was added, shaken and left for 10 minutes, using distilled water as a blank control, and using a visible spectrophotometer to measure the wavelength. The absorbance of the filtrate was measured at 880 nm to evaluate the phosphorus removal effect of the phosphorus remover under different reaction time conditions. The experimental results are shown in Figure 3.

Figure 3 shows that under the condition that other factors remain unchanged, the three parallel experiments (lines a1, a2, a3 in Figure 3) all show that in the first 15 minutes, with the progress of the reaction, the phosphorus concentration in the effluent drops rapidly to below 2mg/L , has reached the national discharge standard, continue to prolong the reaction time, the phosphorus concentration in the effluent fluctuates slightly, but basically does not change. After the reaction for 30 minutes, the concentration of the phosphorus-containing wastewater simulated solution drops to 0.03mg/L, and the phosphorus removal efficiency reaches more than 99%.

4. The effect of phosphorus removal temperature

Take seven 250mL beakers, pipette 100mL of prepared 20 mg/L simulated phosphorus-containing wastewater into the beakers, place the beakers on a magnetic stirrer, and add 0.50g of phosphorus removal agent to the seven beakers in turn. Set the rotating speed of the magnetic stirrer at 140 r/min, and react at 15 °C, 30 °C, 45 °C, 60 °C, 75 °C, 90 °C, and 105 °C for 15 minutes. After the end, the treated water was diluted, and sulfuric acid, The mixed reagent composed of antimony potassium tartrate, ammonium molybdate and ascorbic acid, shake well and let stand for 10min, take distilled water as blank control, measure the absorbance of the filtrate with a visible spectrophotometer at a wavelength of 880nm, to evaluate the phosphorus removal agent under different reaction temperature conditions The phosphorus removal effect, the experimental results are shown in Figure 4.

It can be seen from Figure 4 that within the studied temperature range (15°C to 105°C), the three parallel experiments (lines a1, a2, and a3 in Figure 4) all show that the effluent phosphorus concentration is wavy and fluctuates with the change of temperature. The reaction temperature has little effect on the effluent phosphorus concentration, which also shows that the prepared phosphorus removal agent has good adaptability in the process of water phosphorus removal and phosphorus recovery in practical application, and the phosphorus removal process can be carried out at room temperature.

Example 2

A preparation method of a water body dephosphorization agent, comprising the steps:

1) Crush the waste concrete into waste concrete blocks with a particle size of less than 25 mm with a jaw crusher, and activate the waste concrete blocks at a low temperature of 250 ° C for 25 minutes;

2) The waste concrete blocks after the low-temperature activation treatment in step 1) are pulverized for 10 seconds with an electromagnetic vibration pulverizer to obtain waste concrete powder, and the waste concrete powder is mechanically screened with a 170-mesh sand sieve to remove the waste concrete powder. Coarse aggregate particles in concrete powder, collect undersize to obtain hardened gel matrix;

3) After the hardened gel matrix obtained in step 2) and the surfactant triisopropanolamine are put into a vacuum ball milling tank for mixing, the ball milling activation treatment is carried out by using a planetary ball mill for 7 min to obtain the water phosphorus removal agent ; The mass ratio of the gel matrix to the surfactant is 1000:4.

Put 0.50 g of the phosphorus remover prepared in this example into 100 mL of a phosphorus-containing wastewater simulant with an initial phosphorus concentration of 20 mg/L (in terms of P mass concentration) configured with KH ₂ PO ₄ , at room temperature at a rate of 140 r/min. The stirring rate was stirred for 15 minutes to remove phosphorus in the water body, and the phosphorus in the treated water was detected. The results showed that the phosphorus removal efficiency was 99.89%.

Example 3

A preparation method of a water body dephosphorization agent, comprising the steps:

1) Crush the waste concrete into waste concrete blocks with a particle size of less than 25 mm with a jaw crusher, and activate the waste concrete blocks at a low temperature of 220°C for 30 minutes;

2) The waste concrete blocks after the low-temperature activation treatment in step 1) are pulverized by an electromagnetic vibrating pulverizer for 10 seconds to obtain waste concrete powder. 2.36, 4.75, 9.5mm standard sand and gravel sieves are used to mechanically screen the waste concrete powder to remove the coarse aggregate particles in the waste concrete powder, and collect the under-sieve to obtain a hardened gel matrix;

3) placing the hardened gel matrix obtained in step 2) in a hydrothermal reactor, and performing hydrothermal treatment at 180° C. and 1.0 MPa for 120 min to obtain a gel matrix;

4) After mixing the gel matrix obtained in step 3) and the surfactant ethylene glycol (together into a vacuum ball milling tank for mixing, use a planetary ball mill for ball milling activation treatment for 10 min to obtain the water body phosphorus removal agent; The mass ratio of the gel matrix to the surfactant is 1000:5.

Put 0.5 g of the phosphorus remover prepared in this example into 100 mL of a phosphorus-containing wastewater simulant with an initial phosphorus concentration of 20 mg/L (in terms of P mass concentration) configured with KH ₂ PO ₄ at room temperature at a rate of 140 r/min. The stirring rate was stirred for 15 minutes to remove phosphorus in the water body, and the phosphorus in the treated water was detected. The results showed that the phosphorus removal efficiency was 99.50%.

To sum up, the water body phosphorus removal agent prepared by using the cementitious matrix in the waste concrete of the present invention has the advantages of fast phosphorus removal reaction speed, short phosphorus removal time, high phosphorus removal efficiency, and stable phosphorus removal effect, and the phosphorus removal rate can reach 99%. above. The phosphorus removal reaction is carried out by using the water phosphorus removal agent of the present invention, the reaction temperature range is wide and the reaction can be carried out at room temperature, the restriction on the reaction conditions is less, the operation is easier, and the energy is saved.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be Modifications or equivalent substitutions without departing from the spirit and scope of the technical solutions of the present invention should be included in the scope of the claims of the present invention.

Claims (7)

1. a preparation method of water body dephosphorization agent, is characterized in that, comprises the steps: 1) Crush the waste concrete into waste concrete blocks with a particle size of less than 25 mm, and activate the waste concrete blocks at a low temperature of 200-300 °C for 10-30 minutes; 2) pulverizing the waste concrete blocks after the low-temperature activation treatment in step 1) to obtain waste concrete powder, sieving the waste concrete powder with a 100-325 mesh sieve, and collecting the undersize to obtain a hardened gel matrix; 3) mixing the hardened gel matrix obtained in step 2) with a surfactant to obtain a mixed raw material, and using a ball mill to perform a ball milling activation treatment on the mixed raw material for 2-10 min to obtain the water body phosphorus removal agent; The surfactant described in step 3) is triethanolamine, triisopropanolamine, ethylene glycol or diethylene glycol; The mass ratio of the hardened gel matrix to the surfactant is 1000:2 to 1000:5. 2 . The preparation method of the phosphorus removal agent for water bodies according to claim 1 , wherein the hardened gel matrix obtained in step 2) is placed in a hydrothermal reactor, and the temperature is 150-190° C. and 0.6-1.5 MPa. 2 . The hydrothermal reaction is carried out for 10 to 150 min under the condition of 10 min to obtain a gelled matrix; the said gelled matrix is mixed with a surfactant and subjected to ball milling activation treatment for 2 to 10 min to obtain the said water phosphorus removal agent. 3. The preparation method of the phosphorus removal agent for water body according to claim 2, characterized in that, the hydrothermal reaction is carried out for 120 min under the conditions of 180° C. and 1.0 MPa. 4. a water body dephosphorization method, it is characterized in that, the water body dephosphorization agent that adopts the arbitrary described method of claim 1～3 to make is thrown into the water body to be treated to remove the phosphorus element in the water body to be treated; wherein , the mass-volume ratio of the water phosphorus removal agent to the water to be treated is 0.3-10 g: 1000 mL; The water body phosphorus removal agent is added into the water body to be treated, and the reaction is stirred for 15 to 60 min at a stirring speed of 60 to 180 r/min. 5 . The method for removing phosphorus from a water body according to claim 4 , wherein the mass-volume ratio of the water body phosphorus removing agent to the water body to be treated is 5 g: 1000 mL. 6 . 6 . The method for removing phosphorus from a water body according to claim 4 , wherein the stirring rate is 140 r/min. 7 . 7. The method for removing phosphorus from water according to claim 4, wherein the stirring reaction time is 15 min.