A phosphorus-free composite water treatment agent, its preparation method and application

Abstract

This invention relates to the field of water treatment technology, specifically to a composite water treatment agent, its preparation method, and its application, comprising a slow-release disinfectant, aluminum chloride, ferric chloride, and polyacrylamide; the slow-release disinfectant comprises an adsorbent carrier and a disinfectant in a mass ratio of (7-9):1. Compared with existing technologies, the composite water treatment agent prepared by this invention does not contain phosphorus, significantly reducing the threat of eutrophication and greatly improving water quality. Iron ions can effectively remove aluminum ions from source water and residual free aluminum ions after aluminum salt coagulation. The slow-release disinfectant can gradually alter the morphology of algal cells, disrupting the stability of algal cell structure and thus killing algae. Compared with commonly used polyaluminum chloride, it reduces the amount of treatment agent added, thereby reducing the cost of wastewater treatment. The preparation method is simple and can be industrialized.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, specifically to a composite water treatment agent, its preparation method, and its application. Background Technology

[0002] Water resources are a vital energy source for economic development, making water conservation and wastewater purification and recycling crucial. Existing water treatment technologies include various methods such as physical, chemical, and biological treatment. Physical treatment is the simplest, recovering insoluble suspended pollutants from wastewater through physical separation. However, it is only suitable for simple wastewater treatment and its effectiveness is relatively poor. Biological treatment dissolves pollutants in wastewater through microbial metabolism, but this method requires significant investment and has high operating costs. Chemical treatment is currently considered a more ideal method, using water treatment agents to treat pollutants. These agents primarily control scale and sludge formation, reduce foaming, minimize corrosion of materials in contact with water, remove suspended solids and toxic substances, deodorize and decolorize, soften, and stabilize water quality. With industrial development and the increasing need for water conservation, the concentration ratio of circulating water is constantly rising, placing higher demands on the performance of water treatment agents. Traditional water treatment agents generally contain phosphorus, which can enhance water treatment efficiency. However, water treated with phosphorus-containing agents often has a high concentration of phosphorus, leading to eutrophication. Therefore, developing a phosphorus-free water treatment agent with high treatment efficiency is a technical problem that those skilled in the art want to solve. Summary of the Invention

[0003] To overcome the shortcomings of the above-mentioned technical defects, the present invention provides a composite water treatment agent, a preparation method, and an application.

[0004] This invention is achieved through the following technical solution:

[0005] On the one hand, the present invention provides a composite water treatment agent, which, by mass parts, includes the following components: 20-35 parts slow-release disinfectant, 25-35 parts aluminum chloride, 15-30 parts ferric chloride, and 10-20 parts polyacrylamide.

[0006] The slow-release disinfectant comprises an adsorbent carrier and a disinfectant in a mass ratio of (7-9):1.

[0007] Further, by weight, it includes the following components: 20-30 parts slow-release disinfectant, 30-35 parts aluminum chloride, 15-25 parts ferric chloride, and 10-15 parts polyacrylamide.

[0008] Further, by weight, it includes the following components: 25-28 parts slow-release disinfectant, 32-35 parts aluminum chloride, 15-20 parts ferric chloride, and 12-15 parts polyacrylamide.

[0009] Furthermore, the slow-release disinfectant comprises an adsorbent carrier and a disinfectant in a mass ratio of (8-9):1.

[0010] Furthermore, the adsorption carrier is one of activated carbon, molecular sieve, and diatomaceous earth.

[0011] Furthermore, the slow-release disinfectant is prepared by the following method: diatomaceous earth is heated to 400°C under vacuum, then kept at that temperature for 1-1.5 hours, then removed and allowed to cool naturally; the heated diatomaceous earth is uniformly dispersed in a disinfectant solution with a mass fraction of 5-10%, stirred for 1 hour, then allowed to stand, filtered, and dried to constant weight.

[0012] Furthermore, the diatomaceous earth has a particle size of 20-30 μm.

[0013] Furthermore, the disinfectant is one of potassium permanganate and calcium hypochlorite.

[0014] On the other hand, the present invention provides a method for preparing a composite water treatment agent, the key point of which is:

[0015] S1. Preparation of slow-release disinfectant: Diatomaceous earth is heated to 400℃ under vacuum, and then kept at that temperature for 1-1.5 hours. After that, it is taken out and cooled naturally. The heated diatomaceous earth is evenly dispersed into a disinfectant solution with a mass fraction of 5-10%, stirred for 1 hour, then allowed to stand, filtered, and dried to constant weight.

[0016] S2. Weigh each raw material according to the weight ratio of each raw material;

[0017] S3. Add the slow-release disinfectant, aluminum chloride, and ferric chloride to the mixing tank, stir evenly to obtain a mixture, then add polyacrylamide and stir evenly to obtain a composite water treatment agent.

[0018] On the other hand, the present invention provides an application of a phosphorus-free composite water treatment agent in the field of water treatment.

[0019] Beneficial effects: The composite water treatment agent prepared by this invention does not contain phosphorus, which significantly reduces the threat of eutrophication and greatly improves water quality. It can effectively remove aluminum ions in the source water and the free aluminum ions remaining in the water after aluminum salt coagulation through iron ions. Through slow-release disinfectant, it can gradually change the morphology of algal cells, destroy the stability of algal cell structure and thus kill algae. Compared with commonly used polyaluminum chloride, it reduces the amount of treatment agent to be added, thereby reducing the cost of sewage treatment. The preparation method is simple and can be industrialized. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be described in detail below with reference to specific embodiments. Experimental methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or as recommended by the manufacturer. Unless otherwise specified, the test materials used in the following embodiments were purchased from conventional biochemical reagent stores. Unless otherwise stated, percentages and parts are by weight. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those familiar with the art. Furthermore, any methods and materials similar to or equivalent to those described herein can be applied to the present invention. The preferred embodiments and materials described herein are for illustrative purposes only.

[0021] Example 1: Preparation of Composite Water Treatment Agent

[0022] Diatomaceous earth is heated to 400℃ under vacuum and then kept at that temperature for 1-1.5 hours. After that, it is removed and allowed to cool naturally. The heated diatomaceous earth is then evenly dispersed in a 10% disinfectant solution and stirred for 1 hour. After standing, it is filtered and dried to constant weight to obtain a slow-release disinfectant. 20 parts by weight of the slow-release disinfectant, 25 parts by weight of aluminum chloride, and 20 parts by weight of ferric chloride are weighed and added to a mixing tank and stirred evenly to obtain a mixture. Then, 18 parts by weight of polyacrylamide are added and stirred evenly to obtain a composite water treatment agent.

[0023] Example 2: Preparation of Composite Water Treatment Agent

[0024] Diatomaceous earth is heated to 400℃ under vacuum and then kept at that temperature for 1-1.5 hours. After that, it is removed and allowed to cool naturally. The heated diatomaceous earth is then evenly dispersed in an 8% (w / w) disinfectant solution, stirred for 1 hour, allowed to stand, filtered, and dried to constant weight to obtain a slow-release disinfectant. 22 parts by weight of the slow-release disinfectant, 35 parts by weight of aluminum chloride, and 15 parts by weight of ferric chloride are weighed and added to a mixing tank and stirred evenly to obtain a mixture. Then, 15 parts by weight of polyacrylamide are added and stirred evenly to obtain a composite water treatment agent.

[0025] Example 3: Preparation of Composite Water Treatment Agent

[0026] Diatomaceous earth is heated to 400℃ under vacuum and then kept at that temperature for 1-1.5 hours. After that, it is removed and allowed to cool naturally. The heated diatomaceous earth is then evenly dispersed in a 5% disinfectant solution and stirred for 1 hour. After standing, it is filtered and dried to constant weight to obtain a slow-release disinfectant. 35 parts by weight of the slow-release disinfectant, 25 parts by weight of aluminum chloride, and 20 parts by weight of ferric chloride are weighed and added to a mixing tank and stirred evenly to obtain a mixture. Then, 20 parts by weight of polyacrylamide are added and stirred evenly to obtain a composite water treatment agent.

[0027] Example 4: Preparation of Composite Water Treatment Agent

[0028] Diatomaceous earth is heated to 400℃ under vacuum and then kept at that temperature for 1-1.5 hours. After that, it is removed and allowed to cool naturally. The heated diatomaceous earth is then evenly dispersed in a 6% disinfectant solution and stirred for 1 hour. After standing, it is filtered and dried to constant weight to obtain a slow-release disinfectant. 30 parts by weight of the slow-release disinfectant, 35 parts by weight of aluminum chloride, and 25 parts by weight of ferric chloride are weighed and added to a mixing tank and stirred evenly to obtain a mixture. Then, 15 parts by weight of polyacrylamide are added and stirred evenly to obtain a composite water treatment agent.

[0029] Example 5: Preparation of Composite Water Treatment Agent

[0030] Diatomaceous earth is heated to 400℃ under vacuum and then kept at that temperature for 1-1.5 hours. After that, it is removed and allowed to cool naturally. The heated diatomaceous earth is then evenly dispersed in a 10% disinfectant solution and stirred for 1 hour. After standing, it is filtered and dried to constant weight to obtain a slow-release disinfectant. 28 parts by weight of the slow-release disinfectant, 32 parts by weight of aluminum chloride, and 25 parts by weight of ferric chloride are weighed and added to a mixing tank and stirred evenly to obtain a mixture. Then, 15 parts by weight of polyacrylamide are added and stirred evenly to obtain a composite water treatment agent.

[0031] Example 6: Preparation of Composite Water Treatment Agent

[0032] Diatomaceous earth is heated to 400℃ under vacuum and then kept at that temperature for 1-1.5 hours. After that, it is removed and allowed to cool naturally. The heated diatomaceous earth is then evenly dispersed in a 5% disinfectant solution and stirred for 1 hour. After standing, it is filtered and dried to constant weight to obtain a slow-release disinfectant. 30 parts by weight of the slow-release disinfectant, 28 parts by weight of aluminum chloride, and 18 parts by weight of ferric chloride are weighed and added to a mixing tank and stirred evenly to obtain a mixture. Then, 12 parts by weight of polyacrylamide are added and stirred evenly to obtain a composite water treatment agent.

[0033] Example 7: Preparation of Composite Water Treatment Agent

[0034] Diatomaceous earth is heated to 400℃ under vacuum and then kept at that temperature for 1-1.5 hours. After that, it is removed and allowed to cool naturally. The heated diatomaceous earth is then evenly dispersed in an 8% (w / w) disinfectant solution, stirred for 1 hour, allowed to stand, filtered, and dried to constant weight to obtain a slow-release disinfectant. 35 parts by weight of the slow-release disinfectant, 32 parts by weight of aluminum chloride, and 28 parts by weight of ferric chloride are weighed and added to a mixing tank and stirred evenly to obtain a mixture. Then, 15 parts by weight of polyacrylamide are added and stirred evenly to obtain a composite water treatment agent.

[0035] The composite water treatment agent prepared according to this invention was tested:

[0036] The values ​​of various parameters of the raw water used in the water treatment experiment are shown in Table 1.

[0037] Table 1

[0038] <![CDATA[COD Cr ]]> Suspended matter SS Total phosphorus pollutant TP ammonia nitrogen content Total number of bacteria 267mg / L 178mg / L 10.76 mg / L 33.98 mg / L <![CDATA[2.48×10 4 [pcs / ml]]>

[0039] The composite water treatment agents prepared in the examples were added to the same raw water body. The amount of high-efficiency composite water treatment agent added was 1g per liter of wastewater. The mixture was stirred at a constant temperature of 150r / min and 30℃. After settling for 30min, the mixture was filtered through a 0.45μm filter membrane to obtain the treated water. The turbidity and pollutant concentration of the water before and after treatment were measured, and the removal rate was calculated. The results are shown in Table 2.

[0040]

[0041] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Those skilled in the art, under the guidance of the present invention, can make various similar representations without departing from the spirit and claims of the present invention, and such modifications all fall within the protection scope of the present invention.

Claims

1. A phosphorus-free composite water treatment agent, characterized in that, By weight, it includes the following components: 20-35 parts slow-release disinfectant, 25-35 parts aluminum chloride, 15-30 parts ferric chloride, and 10-20 parts polyacrylamide. The slow-release disinfectant comprises an adsorbent carrier and a disinfectant in a mass ratio of (7-9):1; the slow-release disinfectant is prepared by the following method: diatomaceous earth is heated to 400°C under vacuum, then kept at that temperature for 1-1.5 hours, then removed and allowed to cool naturally; the heated diatomaceous earth is uniformly dispersed in a disinfectant solution with a mass fraction of 5-10%, stirred for 1 hour, then allowed to stand, filtered, and dried to constant weight.

2. The phosphorus-free composite water treatment agent according to claim 1, characterized in that: By weight, it includes the following components: 20-30 parts slow-release disinfectant, 30-35 parts aluminum chloride, 15-25 parts ferric chloride, and 10-15 parts polyacrylamide.

3. The phosphorus-free composite water treatment agent according to claim 1, characterized in that: By weight, it includes the following components: 25-28 parts slow-release disinfectant, 32-35 parts aluminum chloride, 15-20 parts ferric chloride, and 12-15 parts polyacrylamide.

4. The phosphorus-free composite water treatment agent according to claim 1, characterized in that: The slow-release disinfectant comprises an adsorbent carrier and a disinfectant in a mass ratio of (8-9):

1.

5. The phosphorus-free composite water treatment agent according to claim 1, characterized in that: The diatomaceous earth has a particle size of 20-30 μm.

6. The phosphorus-free composite water treatment agent according to claim 5, characterized in that: The disinfectant is one of potassium permanganate and calcium hypochlorite.

7. A method for preparing the phosphorus-free composite water treatment agent as described in claim 1, characterized in that: S1. Preparation of slow-release disinfectant: Diatomaceous earth is heated to 400℃ under vacuum, and then kept at that temperature for 1-1.5 hours. After that, it is taken out and cooled naturally. The heated diatomaceous earth is evenly dispersed into a disinfectant solution with a mass fraction of 5-10%, stirred for 1 hour, then allowed to stand, filtered, and dried to constant weight. S2. Weigh each raw material according to the weight ratio of each raw material; S3. Add the slow-release disinfectant, aluminum chloride, and ferric chloride to the mixing tank, stir evenly to obtain a mixture, then add polyacrylamide and stir evenly to obtain a composite water treatment agent.

8. The application of the phosphorus-free composite water treatment agent as described in claim 1 in the field of water treatment.

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