Preparation method of double-effect phosphorus and nitrogen removal sulfur-based mineral water purification base material

Abstract

The invention discloses a preparation method of a double-effect phosphorus and nitrogen removal sulfur-based mineral water purification base material, the sulfur-based mineral water purification base material comprises a phosphorus and nitrogen removal agent component and a phosphorus and nitrogen removal functional mineral gelling material component, and the phosphorus and nitrogen removal agent comprises ferrous sulfide, ferrous sulfate, calcium carbonate, silica fume and anhydrous sodium thiosulfate; the mineral gelling material with the phosphorus and nitrogen removal function comprises low-alkali Portland cement 42.5, zeolite, diatomite, medical stone, fly ash and hydrogen peroxide. The preparation method comprises the following steps: pre-preparing the phosphorus and nitrogen removal agent components, pre-preparing the phosphorus and nitrogen removal functional mineral gelling material components, and preparing a composite finished product. Compared with the prior art, the long-acting phosphorus and nitrogen removal effect is achieved, and the problems of water eutrophication, excessive phosphorus and nitrogen and the like can be effectively solved. The water purification base material has the advantages of simple preparation process, low cost, stable performance and the like, and has a wide application prospect.

Description

Technical Field

[0001] The invention relates to the field of water purification substrates, and in particular to a method for preparing a sulfur-based mineral water purification substrate for dual-effect phosphorus and nitrogen removal. Background Art

[0002] Water is the source of life, and the water environment plays a vital role in the entire ecosystem. However, in today's society, the water environment faces many severe challenges. With the acceleration of industrialization and urbanization and the widespread development of agricultural activities, a large amount of pollutants are discharged into water bodies, resulting in the continuous deterioration of water environment quality. Among them, the problem of eutrophication of water bodies is particularly prominent and has become one of the major environmental problems that need to be solved urgently worldwide.

[0003] Phosphorus and nitrogen are key factors that lead to eutrophication of water bodies. When the phosphorus and nitrogen content in water bodies exceeds the standard, a series of serious consequences will occur. First, it will cause aquatic organisms such as algae to over-reproduce, forming algal blooms or red tides. These algae consume a large amount of oxygen in the water, causing a sharp drop in the dissolved oxygen content in the water, causing aquatic organisms to die due to lack of oxygen, and destroying the water ecological balance. Secondly, after the algae die and decompose in the water, they will release toxic and harmful substances, further polluting the water body and posing a threat to human health and the ecological environment. In addition, excessive phosphorus and nitrogen will also affect the sensory properties of the water body, making the water turbid and smelly, reducing the use value of the water body.

[0004] In order to solve the problems of eutrophication and excessive phosphorus and nitrogen in water bodies, a variety of treatment methods have been adopted. For example, physical methods include precipitation, filtration, adsorption, etc., but these methods can only remove part of the phosphorus and nitrogen, with limited effect and high cost. Chemical methods such as adding chemical agents can quickly remove phosphorus and nitrogen, but may cause secondary pollution, and require continuous addition of agents, which is costly. Biological methods such as using aquatic plants, microorganisms, etc. for ecological restoration have certain ecological benefits, but the treatment cycle is long and the effect is unstable. Summary of the invention

[0005] The present invention aims to solve the above technical problems and provide a preparation method of a sulfur-based mineral water purification substrate for dual-effect phosphorus and nitrogen removal, aiming to provide a new technical means for solving the problems of eutrophication of water bodies and excessive phosphorus and nitrogen. This water purification substrate combines the advantages of sulfur-based materials and mineral gelling materials, and through a specific preparation method, it can achieve dual-effect removal of phosphorus and nitrogen, and at the same time has the advantages of long-term effectiveness, stability and cost-effectiveness, which can meet the urgent needs of water environment management in reality.

[0006] In order to solve the above technical problems, the technical solution provided by the present invention is: a preparation method of a sulfur-based mineral water purification substrate for dual-effect phosphorus and nitrogen removal, comprising a sulfur-based mineral water purification substrate, a phosphorus and nitrogen removal agent component and a phosphorus and nitrogen removal functional mineral gelling material component, wherein the phosphorus and nitrogen removal agent component comprises the following components by mass: 30-40 parts of ferrous sulfide, 25-35 parts of ferrous sulfate, 15-25 parts of calcium carbonate, 10-20 parts of silica fume, and 1-5 parts of anhydrous sodium thiosulfate;

[0007] The phosphorus and nitrogen removal functional mineral cementitious material comprises the following components by weight: 25-35 parts of low-alkali silicate cement 42.5, 20-30 parts of zeolite, 5-15 parts of diatomaceous earth, 10-20 parts of medical stone, 15-25 parts of fly ash, 1-5 parts of hydrogen peroxide.

[0008] Furthermore, the phosphorus and nitrogen removal agent comprises the following components by weight: 25-36 parts of ferrous sulfide, 20-29 parts of ferrous sulfate, 10-18 parts of calcium carbonate, 8-150 parts of silica fume, and 1-2 parts of anhydrous sodium thiosulfate;

[0009] The phosphorus and nitrogen removal functional mineral gelling material comprises the following components by weight: 20-28 parts of low-alkali silicate cement 42.5, 15-24 parts of zeolite, 8-11 parts of diatomaceous earth, 8-14 parts of medical stone, 10-20 parts of fly ash and 1-3 parts of hydrogen peroxide.

[0010] Furthermore, the mesh grade of each component in the phosphorus and nitrogen removal agent is greater than or equal to 500 mesh;

[0011] The mesh grade of the low-alkali silicate cement is 1000-1500 meshes, the mesh grade of the medical stone is greater than or equal to 20 meshes, the mesh grade of the diatomaceous earth is greater than or equal to 100 meshes, the mesh grade of the fly ash is greater than or equal to 300 meshes, and the mesh grade of the hydrogen peroxide is greater than or equal to 50 meshes.

[0012] Furthermore, the mesh grade of each component in the phosphorus and nitrogen removal agent is 600 mesh;

[0013] The mesh grade of the low-alkali silicate cement is 1250, the mesh grade of the medical stone is 30 meshes, the mesh grade of the diatomaceous earth is 150 meshes, the mesh grade of the fly ash is 400 meshes, and the mesh grade of the hydrogen peroxide is 100 meshes.

[0014] Furthermore, the invention also includes a preparation method:

[0015] Step 1: Pre-preparation of phosphorus and nitrogen removal agent components:

[0016] 1.1 Take ferrous sulfide, ferrous sulfate, calcium carbonate, silica fume and anhydrous sodium thiosulfate according to their mass fractions and grind them to the required mesh grade;

[0017] 1.2 Dry mix the above powders for 10-15 minutes;

[0018] 1.3 After mixing, pour into the granulation equipment for wetting and bonding granulation;

[0019] 1.4 Put the prepared phosphorus and nitrogen removal agent with a particle size of 3-5mm into the drying equipment, and the drying moisture standard is less than 6%;

[0020] 1.5 The formed granular medicine is ready for use;

[0021] Step 2: Pre-preparation of phosphorus and nitrogen removal functional mineral gelling materials

[0022] 2.1 Take low-alkali silicate cement 42.5, zeolite, diatomaceous earth, medical stone, fly ash and hydrogen peroxide according to their mass fractions, grind them and sieve them into the required mesh size;

[0023] 2.2 Dry mix the above powders for 10-15 minutes and set aside;

[0024] Step 3: Composite finished product preparation

[0025] 3.1 Add 5-15% of the granular medicine prepared in step 1 to step 2 and dry mix for 5-7 minutes;

[0026] 3.2 Add clean water according to 18-25% of the total amount of the phosphorus and nitrogen removal agent component and the phosphorus and nitrogen removal functional mineral gelling material component and stir at high speed for 3-5 minutes;

[0027] 3.3 After stirring, pour into the designed mold and cure in the mold for no less than 84 hours;

[0028] 3.4 After demolding, the module size and shape are processed according to the design requirements, that is, a sulfur-based mineral water purification substrate with dual-effect phosphorus and nitrogen removal.

[0029] Furthermore, the stirring speed in the steps 1.2 and 2.2 is 100-200 rpm, and the speed of high-speed wet stirring in the step 3.2 is greater than 500 rpm.

[0030] The advantages of the present invention compared with the prior art are:

[0031] 1. Long-term effect

[0032] After the gelling material encapsulates the hydrophilic agent, it slows down the dissolution efficiency and diffusion rate through the nano-scale pores to achieve the purpose of controlled and sustained release of the drug. Through the loading capacity of the substrate, the agent can be targeted to deliver the target phosphorus and nitrogen beyond the limit, thus realizing the long-term effectiveness of the phosphorus and nitrogen removal agent.

[0033] 2. Double effect

[0034] The phosphorus and nitrogen removal agent plus mineral polymers (gelling materials) with phosphorus and nitrogen removal functions, coupled with the characteristics of rich pores and strong adsorption, enhances the dual effect of the removal rate ratio.

[0035] 3. Excellent performance characteristics

[0036] The water purification substrate has a porosity greater than or equal to 60% and a specific surface area greater than or equal to 6m 2 / g, pore diameter nanometer level greater than 60%, compressive strength not less than 3MPa, phosphorus and nitrogen removal rate not less than 80% and other excellent performance characteristics.

[0037] The sulfur-based mineral water purification substrate with dual-effect phosphorus and nitrogen removal obtained by the preparation method of the present invention has a long-term dual-effect phosphorus and nitrogen removal effect, and can effectively solve the problems of water eutrophication, excessive phosphorus and nitrogen, etc. The water purification substrate has the advantages of simple preparation process, low cost, stable performance, etc., and has broad application prospects.

[0038] In practical applications, the water purification substrate can be used in sewage treatment plants, industrial wastewater treatment, river and lake water restoration and other fields. By placing the water purification substrate in the water body, it can effectively remove phosphorus, nitrogen and other substances in the water, improve water quality and protect the water ecological environment. In addition, the water purification substrate can also be combined with other water treatment technologies, such as biological treatment, physical treatment, etc., to form a comprehensive water treatment system to improve water treatment effect and efficiency.

[0039] In summary, the preparation method of the dual-effect sulfur-based mineral water purification substrate for removing phosphorus and nitrogen of the present invention has important practical significance and application value, and provides an effective technical means for solving the problems of eutrophication of water bodies, excessive phosphorus and nitrogen, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a finished product diagram of the method for preparing a sulfur-based mineral water purification substrate with dual-effect phosphorus and nitrogen removal according to the present invention.

[0041] Figure 2 This is a diagram of a phosphorus and nitrogen removal granular agent for a method for preparing a sulfur-based mineral water purification substrate for dual-effect phosphorus and nitrogen removal according to the present invention. DETAILED DESCRIPTION

[0042] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0043] 1. Working principle of the present invention:

[0044] 1. The role of phosphorus and nitrogen removal agent components

[0045] The phosphorus and nitrogen removal agent of the present invention comprises, by weight, ferrous sulfide, ferrous sulfate, calcium carbonate, silica fume, anhydrous sodium thiosulfate and the like. These components can react chemically with substances such as phosphorus and nitrogen in water, thereby achieving the purpose of removing phosphorus and nitrogen.

[0046] Among them, ferrous sulfide and ferrous sulfate can react with phosphates in water to form insoluble ferric phosphate and ferrous phosphate precipitates; calcium carbonate can react with ammonium ions in water to form insoluble calcium carbonate precipitates; silica fume and anhydrous sodium thiosulfate can play a role in adjusting the pH value and promoting the reaction.

[0047] 2. The role of mineral cementitious materials components in phosphorus and nitrogen removal

[0048] The components of the phosphorus and nitrogen removal functional mineral cementitious materials include low-alkali silicate cement, zeolite, diatomaceous earth, medical stone, fly ash, hydrogen peroxide and other ingredients by mass. These ingredients have rich pore structure and adsorption properties, and can effectively adsorb phosphorus, nitrogen and other substances in water.

[0049] As a cementitious material, low-alkali silicate cement can bind the phosphorus and nitrogen removal agent components and other mineral components together to form a water purification base material with certain strength and stability. Zeolite, diatomaceous earth, medical stone and other minerals have rich pore structures and adsorption properties, and can effectively adsorb phosphorus, nitrogen and other substances in water. Fly ash can play a filling and reinforcing role, improving the strength and stability of the water purification base material. Hydrogen peroxide can play an oxidizing role, oxidizing organic phosphorus, organic nitrogen and other substances in water into inorganic phosphorus and inorganic nitrogen, thereby improving the effect of phosphorus and nitrogen removal.

[0050] 3. Preparation principle of composite finished products

[0051] First, the phosphorus and nitrogen removal agent components are pre-prepared, including grinding, dry mixing, granulation, drying and other steps to obtain a molded granular agent. Then, the phosphorus and nitrogen removal functional mineral gelling material component is pre-prepared, including grinding, screening into required mesh grades, dry mixing and other steps. Finally, the molded granular agent is added to the phosphorus and nitrogen removal functional mineral gelling material component in a certain proportion, and after dry mixing, clean water is added for high-speed wet stirring. After stirring, it is poured into the designed mold for curing. After demolding, the modulus size and shape are processed according to the design requirements to obtain a sulfur-based mineral water purification substrate with dual-effect phosphorus and nitrogen removal. 2. Specific implementation methods:

[0053] (I) Formula of phosphorus and nitrogen removal agent components and phosphorus and nitrogen removal functional mineral gelling material components

[0054] 1. Components of phosphorus and nitrogen removal agents

[0055] The composition includes the following components by weight: 30-40 parts of ferrous sulfide, 25-35 parts of ferrous sulfate, 15-25 parts of calcium carbonate, 10-20 parts of silica fume and 1-5 parts of anhydrous sodium thiosulfate.

[0056] Alternatively, the composition includes the following components by mass: 25-36 parts of ferrous sulfide, 20-29 parts of ferrous sulfate, 10-18 parts of calcium carbonate, 8-15 parts of silica fume, and 1-2 parts of anhydrous sodium thiosulfate.

[0057] 2. Components of mineral cementitious materials with phosphorus and nitrogen removal functions

[0058] The composition comprises the following components by weight: 25-35 parts of low-alkali silicate cement 42.5, 20-30 parts of zeolite, 5-15 parts of diatomaceous earth, 10-20 parts of medical stone, 15-25 parts of fly ash and 1-5 parts of hydrogen peroxide.

[0059] Alternatively, the following components are included by mass: 20-28 parts of low-alkali silicate cement 42.5, 15-24 parts of zeolite, 8-11 parts of diatomaceous earth, 8-14 parts of medical stone, 10-20 parts of fly ash, and 1-3 parts of hydrogen peroxide.

[0060] (II) Mesh grade requirements for each component

[0061] 1. The mesh grade of each component in the phosphorus and nitrogen removal agent is greater than or equal to 500 mesh, preferably 600 mesh.

[0062] 2. The mesh grade of low-alkali silicate cement is 1000-1500 mesh, preferably 1250 mesh.

[0063] 3. The mesh grade of medical stone is greater than or equal to 20 mesh, preferably 30 mesh.

[0064] 4. The mesh grade of diatomaceous earth is greater than or equal to 100 mesh, preferably 150 mesh.

[0065] 5. The mesh grade of fly ash is greater than or equal to 300 mesh, preferably 400 mesh.

[0066] 6. The mesh grade of hydrogen peroxide is greater than or equal to 50 mesh, preferably 100 mesh.

[0067] (III) Preparation method

[0068] 1. Pre-preparation of phosphorus and nitrogen removal agent components

[0069] Step 1.1: Take ferrous sulfide, ferrous sulfate, calcium carbonate, silica fume and anhydrous sodium thiosulfate according to their mass fractions, and grind them to the required mesh grade.

[0070] Step 1.2: Dry mix the above powders for 10-15 minutes at a stirring speed of 100-200 rpm.

[0071] Step 1.3: After mixing, pour into the granulation equipment for wetting and bonding granulation.

[0072] Step 1.4: Control the particle size of the prepared phosphorus and nitrogen removal agent to 3-5 mm, put it into a drying device, and dry it until the moisture standard is less than 6%.

[0073] Step 1.5: Prepare the granular medicine for later use.

[0074] 2. Pre-preparation of components of mineral cementitious materials with phosphorus and nitrogen removal function

[0075] Step 2.1: Take 42.5% low-alkali silicate cement, zeolite, diatomaceous earth, medical stone, fly ash and hydrogen peroxide according to their mass proportions, grind them and sieve them into the required mesh size.

[0076] Step 2.2: Dry mix the above powders for 10-15 minutes and set aside at a stirring speed of 100-200 rpm.

[0077] 3. Preparation of composite finished products

[0078] Step 3.1: Add the formed granular medicine in step 1 into step 2 at a ratio of 5-15%, and dry mix for 5-7 minutes.

[0079] Step 3.2: Add clean water according to 18-25% of the total amount of the phosphorus and nitrogen removal agent components and the phosphorus and nitrogen removal functional mineral gelling material components, and carry out high-speed wet stirring for 3-5 minutes. The rotation speed of the high-speed wet stirring is greater than 500 rpm.

[0080] Step 3.3: After stirring, pour into the designed mold and cure in the mold for no less than 84 hours.

[0081] Step 3.4: After demolding, the module size and shape are processed according to the design requirements to obtain a sulfur-based mineral water purification substrate with dual-effect phosphorus and nitrogen removal.

[0082] (IV) Performance characteristics of water purification substrates

[0083] 1. Porosity is greater than or equal to 60%: High porosity allows the water purification substrate to accommodate more phosphorus and nitrogen removal agents and adsorb more phosphorus, nitrogen and other substances, thereby improving the phosphorus and nitrogen removal effect.

[0084] 2. Specific surface area is greater than or equal to 6m 2 / g: The large specific surface area increases the contact area between the water purification substrate and water, and improves the reaction efficiency and adsorption performance of the phosphorus and nitrogen removal agent.

[0085] 3. The pore diameter is greater than 60% at the nanoscale: The nanoscale pore structure can slow down the dissolution efficiency and diffusion rate of the phosphorus and nitrogen removal agent, achieve controlled and sustained release of the drug efficacy, and improve the long-term effectiveness of the phosphorus and nitrogen removal agent.

[0086] 4. Compressive strength is not less than 3MPa: Good compressive strength ensures the stability and durability of the water purification substrate during use.

[0087] 5. Phosphorus and nitrogen removal rate is not less than 80%: The dual-effect phosphorus and nitrogen removal rate can effectively reduce the phosphorus and nitrogen content in water and improve water quality.

[0088] 3. Examples and Comparative Examples

[0089] Embodiment 1:

[0090] 1. Components of phosphorus and nitrogen removal agent:

[0091] Take 35 parts of ferrous sulfide, 30 parts of ferrous sulfate, 20 parts of calcium carbonate, 15 parts of silica fume, and 3 parts of anhydrous sodium thiosulfate, all of which are 600 mesh.

[0092] After grinding and pulverizing, dry mixing is performed for 12 minutes (rotation speed 150 rpm), granulation (particle size 4 mm), and drying (moisture content 5%) for later use.

[0093] 2. Components of mineral gelling materials with phosphorus and nitrogen removal functions:

[0094] Low-alkali silicate cement 42.5 (30 parts, 1250 mesh), zeolite (25 parts, 100 mesh), diatomaceous earth (10 parts, 150 mesh), medical stone (15 parts, 30 mesh), fly ash (20 parts, 400 mesh), hydrogen peroxide (3 parts, 100 mesh).

[0095] After crushing and screening into the required mesh size, dry mix for 12 minutes (speed 150 rpm) and set aside.

[0096] 3. Preparation of composite finished products:

[0097] Add the forming granule agent into the gelling material component at a ratio of 10%, and dry mix for 6 minutes.

[0098] Add 20% of the total amount of water and stir at high speed for 4 minutes (speed 600 rpm).

[0099] Pour into mold and cure for 84 hours.

[0100] Embodiment 2:

[0101] 1. Phosphorus and nitrogen removal agent components: The same steps as in Example 1, take 32 parts of ferrous sulfide, etc., and treat them for later use.

[0102] 2. Components of mineral gelling materials with phosphorus and nitrogen removal function: The same steps as in Example 1 are followed, except that the corresponding components are processed and set aside.

[0103] 3. Preparation of composite finished products:

[0104] Add the forming granule agent at a ratio of 8% and dry mix for 5.5 minutes.

[0105] Add 19% of the total amount of water and stir at high speed for 3.5 minutes (speed 550 rpm).

[0106] Mould curing for 86 hours.

[0107] Embodiment 3:

[0108] 1. Phosphorus and nitrogen removal agent components: The same steps as in Example 1, take 38 parts of ferrous sulfide, etc., treat and set aside.

[0109] 2. Components of phosphorus and nitrogen removal functional mineral gelling material: Same as the steps in Example 1, except that the corresponding components are processed and set aside.

[0110] 3. Preparation of composite finished products:

[0111] Add the forming granule agent at a ratio of 12% and dry mix for 6.5 minutes.

[0112] Add 22% of the total amount of water and stir at high speed for 4.5 minutes (speed 650 rpm).

[0113] Mould curing for 88 hours.

[0114] Comparative Example 1:

[0115] 1. Components of phosphorus and nitrogen removal agent:

[0116] Take 25 parts of ferrous sulfide, 20 parts of ferrous sulfate, 10 parts of calcium carbonate, 8 parts of silica fume, and 1 part of anhydrous sodium thiosulfate, all of which are 600 mesh.

[0117] After grinding and pulverizing, dry mixing is performed for 10 minutes (rotation speed is 120 rpm), granulation (particle size 3 mm), and drying (water content 4%) for later use.

[0118] 2. Components of mineral gelling materials with phosphorus and nitrogen removal functions:

[0119] Low alkali silicate cement 42.5 (20 parts, 1200 mesh), zeolite (15 parts, 80 mesh), diatomaceous earth (8 parts, 120 mesh), medical stone (8 parts, 25 mesh), fly ash (10 parts, 350 mesh), hydrogen peroxide (1 part, 80 mesh).

[0120] After crushing and screening into the required mesh size, dry mix for 10 minutes (speed 120 rpm) and set aside.

[0121] 3. Preparation of composite finished products:

[0122] Add the forming granule agent into the gelling material component at a ratio of 5%, and dry mix for 5 minutes.

[0123] Add 18% of the total amount of water and stir at high speed for 3 minutes (speed 500 rpm).

[0124] Pour into mold and cure for 80 hours.

[0125] Comparative Example 2:

[0126] 1. Components of phosphorus and nitrogen removal agent:

[0127] Take 45 parts of ferrous sulfide, 40 parts of ferrous sulfate, 30 parts of calcium carbonate, 25 parts of silica fume, and 6 parts of anhydrous sodium thiosulfate, all of which are 600 mesh.

[0128] After grinding and pulverizing, dry mixing is performed for 15 minutes (rotation speed is 180 rpm), granulation (particle size 5 mm), and drying (moisture content 6%) for later use.

[0129] 2. Components of mineral gelling materials with phosphorus and nitrogen removal functions:

[0130] Low-alkali silicate cement 42.5 (38 parts, 1300 mesh), zeolite (32 parts, 120 mesh), diatomaceous earth (15 parts, 180 mesh), medical stone (22 parts, 35 mesh), fly ash (28 parts, 450 mesh), hydrogen peroxide (6 parts, 120 mesh).

[0131] After crushing and screening into the required mesh size, dry mix for 15 minutes (speed 180 rpm) and set aside.

[0132] 3. Preparation of composite finished products:

[0133] Add the forming granule agent into the gelling material component at a ratio of 18%, and dry mix for 7 minutes.

[0134] Add 25% of the total amount of water and stir at high speed for 5 minutes (speed 700 rpm).

[0135] Pour into mold and cure for 90 hours.

[0136] Table 1: Performance data are as follows:

[0137]

[0138]

[0139] Data results: Examples 1 to 3 use a specific formula and preparation process, with a porosity between 61% and 63% and a specific surface area of ​​6.2 m 2 / g-6.8m 2 / gram, the proportion of nano-scale pore diameter is 63%-67%, the compressive strength is not less than 3.2MPa, and the phosphorus and nitrogen removal rate is 83%-87%. However, due to the relatively low proportion of each component and slightly weaker process parameters, the performance of Comparative Example 1 is slightly inferior, and the porosity, specific surface area, proportion of nano-scale pores, compressive strength and phosphorus and nitrogen removal rate are all lower than those of the embodiment. Although Comparative Example 2 has improved some performances, the cost increase is large and there may be overreaction problems.

[0140] In general, the formula and process of the embodiment can achieve a better balance of cost-effectiveness while ensuring performance, and provide a reliable solution for the preparation of sulfur-based mineral water purification substrates for dual-effect phosphorus and nitrogen removal.

[0141] The present invention and its implementation methods are described above, and such description is not restrictive, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design structures and embodiments similar to the technical solution without creativity, which should all fall within the protection scope of the present invention.

Claims

1. A method for preparing a sulfur-based mineral water purification substrate for dual-effect phosphorus and nitrogen removal, characterized in that: It comprises a sulfur-based mineral water purification substrate, a phosphorus and nitrogen removal agent component and a phosphorus and nitrogen removal functional mineral gelling material component, wherein the phosphorus and nitrogen removal agent component comprises the following components by weight: 30-40 parts of ferrous sulfide, 25-35 parts of ferrous sulfate, 15-25 parts of calcium carbonate, 10-20 parts of silica fume, and 1-5 parts of anhydrous sodium thiosulfate; The phosphorus and nitrogen removal functional mineral gelling material comprises the following components by weight: 25-35 parts of low-alkali silicate cement 42.5, 20-30 parts of zeolite, 5-15 parts of diatomaceous earth, 10-20 parts of medical stone, 15-25 parts of fly ash and 1-5 parts of hydrogen peroxide.

2. The method for preparing a sulfur-based mineral water purification substrate for dual-effect phosphorus and nitrogen removal according to claim 1, characterized in that: The phosphorus and nitrogen removal agent comprises the following components by weight: 25-36 parts of ferrous sulfide, 20-29 parts of ferrous sulfate, 10-18 parts of calcium carbonate, 8-150 parts of silica fume, and 1-2 parts of anhydrous sodium thiosulfate; The phosphorus and nitrogen removal functional mineral gelling material comprises the following components by weight: 20-28 parts of low-alkali silicate cement 42.5, 15-24 parts of zeolite, 8-11 parts of diatomaceous earth, 8-14 parts of medical stone, 10-20 parts of fly ash and 1-3 parts of hydrogen peroxide.

3. The method for preparing a sulfur-based mineral water purification substrate for dual-effect phosphorus and nitrogen removal according to claim 1, characterized in that: The mesh grade of each component in the phosphorus and nitrogen removal agent is greater than or equal to 500 mesh; The mesh grade of the low-alkali silicate cement is 1000-1500 meshes, the mesh grade of the medical stone is greater than or equal to 20 meshes, the mesh grade of the diatomaceous earth is greater than or equal to 100 meshes, the mesh grade of the fly ash is greater than or equal to 300 meshes, and the mesh grade of the hydrogen peroxide is greater than or equal to 50 meshes.

4. The method for preparing a sulfur-based mineral water purification substrate for dual-effect phosphorus and nitrogen removal according to claim 1, characterized in that: The mesh grade of each component in the phosphorus and nitrogen removal agent is 600 mesh; The mesh grade of the low-alkali silicate cement is 1250, the mesh grade of the medical stone is 30 meshes, the mesh grade of the diatomaceous earth is 150 meshes, the mesh grade of the fly ash is 400 meshes, and the mesh grade of the hydrogen peroxide is 100 meshes.

5. A method for preparing a sulfur-based mineral water purification substrate for dual-effect phosphorus and nitrogen removal according to any one of claims 1 to 4, characterized in that: Also included is a preparation method: Step 1: Pre-preparation of phosphorus and nitrogen removal agent components: 1.1 Take ferrous sulfide, ferrous sulfate, calcium carbonate, silica fume and anhydrous sodium thiosulfate according to their mass fractions and grind them to the required mesh grade; 1.2 Dry mix the above powders for 10-15 minutes; 1.3 After mixing, pour into the granulation equipment for wetting and bonding granulation; 1.4 Put the prepared phosphorus and nitrogen removal agent with a particle size of 3-5mm into the drying equipment, and the drying moisture standard is less than 6%; 1.5 The formed granular medicine is ready for use; Step 2: Pre-preparation of phosphorus and nitrogen removal functional mineral gelling materials 2.1 Take low-alkali silicate cement 42.5, zeolite, diatomaceous earth, medical stone, fly ash and hydrogen peroxide according to their mass fractions, grind them and sieve them into the required mesh size; 2.2 Dry mix the above powders for 10-15 minutes and set aside; Step 3: Composite finished product preparation 3.1 Add 5-15% of the granular medicine prepared in step 1 to step 2 and dry mix for 5-7 minutes; 3.2 Add clean water according to 18-25% of the total amount of the phosphorus and nitrogen removal agent component and the phosphorus and nitrogen removal functional mineral gelling material component and stir at high speed for 3-5 minutes; 3.3 After stirring, pour into the designed mold and cure in the mold for no less than 84 hours; 3.4 After demolding, the module size and shape are processed according to the design requirements, that is, a sulfur-based mineral water purification substrate with dual-effect phosphorus and nitrogen removal.

6. The method for preparing a sulfur-based mineral water purification substrate for dual-effect phosphorus and nitrogen removal according to claim 5, characterized in that: The stirring speed in the steps 1.2 and 2.2 is 100-200 rpm, and the speed of high-speed wet stirring in the step 3.2 is greater than 500 rpm.

Images