Laundry sewage treatment agent and preparation method thereof

Abstract

The invention discloses a laundry sewage treatment agent and a preparation method thereof, and belongs to the technical field of sewage treatment. The treatment agent is prepared from the following raw materials in percentage by mass: 12 to 26.4 percent of polyacrylonitrile-based activated carbon fiber, 6 to 10 percent of poly-aluminum ferric silicate, 3.1 to 7 percent of medical stone, 5 to 10.5 percent of inorganic-organic hybrid polymeric flocculant PAC-P (AM-BA), 4 to 8 percent of decolorizing agent, 7 to 15 percent of poly-lanthanum silicate and the balance of calcium peroxide / polypropylene composite particles, wherein the total mass of the treatment agent is 100 percent. The treatment agent disclosed by the invention has a good surfactant removal effect and a good phosphorus removal effect on the laundry wastewater, and is more suitable for treating the laundry wastewater.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and more specifically, to a laundry sewage treatment agent and a preparation method thereof. Background Art

[0002] In order to effectively remove stains and grease from clothes and ensure that clothes are clean, washing clothes must use detergents (such as washing powder, washing liquid, washing soap, etc.), which makes the laundry wastewater contain a large amount of surfactants and oil, dust particles, colloids, harmful microorganisms and other pollutants, and the COD and suspended solids values ​​are relatively high. In addition, since some detergents contain phosphorus, the phosphorus will dissolve in the water during the washing process, resulting in a high total phosphorus content in the laundry wastewater.

[0003] At present, there are coagulation, membrane treatment, microbial degradation and other treatment methods for laundry wastewater. Although they have been applied to a certain extent, they also have some limitations. Coagulation is the most common treatment method, but the use of conventional agents in the treatment of surfactant-rich wastewater often encounters problems such as difficulty in coagulation and non-agglomeration of flocs. The agent consumption is large, and the treatment effect of organic matter, suspended solids and phosphorus is not ideal; the membrane treatment method has a better effect but is prone to clogging, and requires regular maintenance and replacement of membranes, with high investment and operation and maintenance costs; the microbial degradation method has a relatively slow degradation rate, and it takes a long time to accumulate specific microorganisms to achieve the ideal degradation effect, and the treatment efficiency is low. Therefore, it is of great practical significance to develop a new treatment agent for laundry wastewater. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a laundry wastewater treatment agent and a preparation method thereof. The obtained treatment agent can effectively remove surfactants, phosphorus elements and other pollutants in laundry wastewater, meeting the requirements for laundry wastewater treatment.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A laundry wastewater treatment agent, based on 100% of the total mass of the treatment agent, is made of the following raw materials in percentage by mass: 12-26.4% polyacrylonitrile-based activated carbon fiber, 6-10% polyaluminum ferrosilicate, 3.1-7% medical stone, 5-10.5% inorganic-organic hybrid polymer flocculant PAC-P (AM-BA), 4-8% decolorizing agent, 7-15% polylanthanum silicate, and the remainder is calcium peroxide / polypropylene composite particles.

[0007] The present invention is further configured such that the inorganic-organic hybrid polymer flocculant PAC-P (AM-BA) is a flocculant with hydrophobic groups made from polyaluminium chloride, polyacrylamide and butyl acrylate as raw materials.

[0008] The present invention is further configured such that the particle size of the calcium peroxide / polypropylene composite particles is 0.1-2 mm.

[0009] The present invention is further configured that the calcium peroxide / polypropylene composite particles are prepared by the following method: calcium peroxide powder and polypropylene chips are uniformly mixed, and then extruded and granulated by a screw extruder to obtain calcium peroxide / polypropylene composite particles.

[0010] The present invention is further configured such that the mass ratio of the calcium peroxide powder to the polypropylene slice is 0.01-0.1:1.

[0011] The present invention is further configured such that the particle size of the calcium peroxide powder is 1-10 μm.

[0012] The present invention is further configured such that the temperatures of the screw extruder zone 1 to zone 5 are 175-185°C, 180-195°C, 195-210°C, 210-220°C, and 220-230°C, respectively.

[0013] The present invention is further configured such that the decolorizing agent is a decolorizing agent JS.

[0014] The present invention is further configured that, based on 100% of the total mass of the treatment agent, the treatment agent is made of the following raw materials in percentage by mass: 25% polyacrylonitrile-based activated carbon fiber, 8.4% polyaluminum ferrosilicate, 5% medical stone, 10.6% inorganic-organic hybrid polymer flocculant PAC-P (AM-BA), 5.9% decolorizer JS, 12% polylanthanum silicate, and the remainder is calcium peroxide / polypropylene composite particles.

[0015] A method for preparing a laundry wastewater treatment agent comprises mixing polyacrylonitrile-based activated carbon fiber, polyaluminium ferrosilicate, medical stone, calcium peroxide / polypropylene composite particles, inorganic-organic hybrid polymer flocculant PAC-P (AM-BA), a decolorizing agent and polylanthanum silicate in proportion to obtain a treatment agent.

[0016] In summary, the present invention has the following beneficial effects:

[0017] 1. Calcium peroxide / polypropylene composite particles are compounded with other raw materials to prepare laundry wastewater treatment agents, which achieves efficient removal of pollutants in laundry wastewater; the properties of calcium peroxide reacting with water to generate oxygen and calcium hydroxide are used to improve the removal rate of pollutants such as surfactants, suspended solids, and oil stains. At the same time, the water solubility of calcium peroxide is used to make the surface of polypropylene particles have micropores, further improving the removal effect of pollutants.

[0018] 2. Through the synergistic effect between the inorganic-organic hybrid polymer flocculant PAC-P (AM-BA) and polylanthanum silicate and decolorizer JS, the dephosphorization effect of laundry wastewater is further greatly improved. DETAILED DESCRIPTION

[0019] 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.

[0020] Based on 100% of the total mass of the treatment agent, the laundry wastewater treatment agent of the present invention is made of the following raw materials in percentage by mass: 12-26.4% of polyacrylonitrile-based activated carbon fiber, 6-10% of polyaluminum ferric silicate, 3.1-7% of medical stone, 5-10.5% of inorganic-organic hybrid polymer flocculant PAC-P (AM-BA), 4-8% of decolorizer (preferably the decolorizer JS purchased from Shenzhen Jinsheng Environmental Protection Technology Co., Ltd., which is a high molecular polymer decolorizer, and its molecular chain contains a variety of functional groups, which integrates the action mechanisms of adsorption, bridging, coagulation, coprecipitation, netting, etc., and can achieve the removal of suspended matter, COD and the reduction of sludge), 7-15% of polylanthanum silicate, and the balance is calcium peroxide / polypropylene composite particles.

[0021] The treatment agent of the present invention can be obtained by uniformly mixing polyacrylonitrile-based activated carbon fiber, polyaluminum ferrosilicate, medical stone, calcium peroxide / polypropylene composite particles, inorganic-organic hybrid polymer flocculant PAC-P (AM-BA), decolorizing agent, and polylanthanum silicate in proportion.

[0022] Among them, the inorganic-organic hybrid polymer flocculant PAC-P (AM-BA) is a flocculant with hydrophobic groups made from polyaluminium chloride, polyacrylamide and butyl acrylate, and is prepared according to the method described in the paper (Preparation of inorganic-organic hybrid polymer flocculants and research on their flocculation efficiency [D]. Zhu Fengrui. Northeast Petroleum University. 2023). Polylanthanum silicate is prepared according to the method described in Example 1 of the patent "A polylanthanum silicate flocculant, its preparation method and application" with publication number CN115745115A.

[0023] The calcium peroxide / polypropylene composite particles are prepared by the following method: calcium peroxide powder with a particle size of 1-10 μm and polypropylene chips are uniformly mixed at a mass ratio of 0.01-0.1:1, and then extruded and granulated by a screw extruder (the temperatures of the first to fifth zones of the screw extruder are 175-185°C, 180-195°C, 195-210°C, 210-220°C, and 220-230°C, respectively), to obtain calcium peroxide / polypropylene composite particles with a particle size of 0.1-2 mm. When the treatment agent of the present invention is added to laundry sewage, calcium peroxide reacts with water to generate calcium hydroxide and oxygen. The oxygen forms bubbles in the sewage. The bubbles carry part of the surfactants, suspended matter and oil stains in the sewage during the rising process, thereby achieving the removal of part of the surfactants, suspended matter and oil stains. The generated calcium hydroxide can be used as a flocculant to help remove pollutants such as suspended matter and colloid substances in the sewage. At the same time, the calcium peroxide / polypropylene composite particles lose calcium peroxide, resulting in micropores on the particle surface, which can be used as a flocculation and adsorption material to further help remove pollutants in the sewage.

[0024] The preferred embodiment is:

[0025] Example 1

[0026] (1) Inorganic-organic hybrid polymer flocculant PAC-P (AM-BA) and polylanthanum silicate were prepared according to the above method;

[0027] (2) Calcium peroxide powder with a particle size of 1-10 μm and polypropylene chips are uniformly mixed in a mass ratio of 0.06:1, and then extruded and granulated by a screw extruder (the temperatures of the first to fifth zones of the screw extruder are 175°C, 186°C, 198°C, 210°C, and 221°C, respectively), to obtain calcium peroxide / polypropylene composite particles with a particle size of 0.5 mm;

[0028] (3) Based on the total mass of the treatment agent as 100%, prepare the following raw materials in percentage by mass: 25% polyacrylonitrile-based activated carbon fiber, 8.4% polyaluminum ferrosilicate, 5% medical stone, 33.1% calcium peroxide / polypropylene composite particles, 10.6% inorganic-organic hybrid polymer flocculant PAC-P (AM-BA), 5.9% decolorizing agent JS, and 12% polylanthanum silicate; then mix the raw materials evenly to obtain a laundry wastewater treatment agent.

[0029] Comparative Example 1

[0030] (1) According to step (1) in Example 1, an inorganic-organic hybrid polymer flocculant PAC-P (AM-BA) and polylanthanum silicate were prepared respectively;

[0031] (2) Based on the total mass of the treatment agent as 100%, prepare the following raw materials in percentage by mass: 25% polyacrylonitrile-based activated carbon fiber, 8.4% polyaluminum ferrosilicate, 5% medical stone, 33.1% calcium peroxide and polypropylene mixture (the calcium peroxide content in the calcium peroxide and polypropylene mixture is the same as the calcium peroxide content in the calcium peroxide / polypropylene composite particles in Example 1, and the polypropylene content in the calcium peroxide and polypropylene mixture is the same as the polypropylene content in the calcium peroxide / polypropylene composite particles in Example 1), 10.6% inorganic-organic hybrid polymer flocculant PAC-P (AM-BA), 5.9% decolorizing agent JS, and 12% polylanthanum silicate; then mix the raw materials evenly to prepare a laundry wastewater treatment agent.

[0032] Comparative Example 2

[0033] The sewage treatment agent was prepared according to the method described in Example 1, except that the inorganic-organic hybrid polymer flocculant PAC-P (AM-BA) was not added.

[0034] Comparative Example 3

[0035] The sewage treatment agent was prepared according to the method described in Example 1, except that no polylanthanum silicate was added.

[0036] Comparative Example 4

[0037] The sewage treatment agent was prepared according to the method described in Example 1, except that no decolorizing agent JS was added.

[0038] The agents prepared in Example 1 and Comparative Examples 1 to 4 were used to treat laundry wastewater (the treated wastewater was homemade wastewater simulating daily laundry wastewater containing high concentrations of anionic surfactant LAS and pollutants such as phosphates and oil), and the treatment performance of each agent was tested. The test results are shown in the following table:

[0039]

[0040] It can be seen from the data in the table that the sewage treatment agent of the present invention can effectively remove pollutants such as surfactants, oil stains, dust particles, phosphorus elements, etc. in the water body; by comparing the data of Example 1 with that of Comparative Example 1, it can be found that when the calcium peroxide / polypropylene composite particles are used to prepare the agent and the washing sewage is treated, not only the surfactants and other organic pollutants can be removed by the generated oxygen bubbles, but also the polypropylene particles with micropores on the surface and the generated calcium hydroxide can further promote the pollutant removal effect; by comparing the experimental data of Example 1 with Comparative Examples 2-4, it can be seen that the inorganic-organic hybrid polymer flocculant PAC-P (AM-BA) has a synergistic effect with polylanthanum silicate and the decolorizer JS, which can further greatly improve the dephosphorization effect.

[0041] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A laundry wastewater treatment agent, characterized in that: Based on 100% of the total mass of the treatment agent, the treatment agent is made of the following raw materials in percentage by mass: 12-26.4% of polyacrylonitrile-based activated carbon fiber, 6-10% of polyaluminum ferrosilicate, 3.1-7% of medical stone, 5-10.5% of inorganic-organic hybrid polymer flocculant PAC-P (AM-BA), 4-8% of decolorizing agent, 7-15% of polylanthanum silicate, and the remainder is calcium peroxide / polypropylene composite particles.

2. A laundry wastewater treatment agent according to claim 1, characterized in that: The inorganic-organic hybrid polymer flocculant PAC-P (AM-BA) is a flocculant with hydrophobic groups made from polyaluminium chloride, polyacrylamide and butyl acrylate.

3. The laundry wastewater treatment agent according to claim 1, characterized in that: The particle size of the calcium peroxide / polypropylene composite particles is 0.1-2 mm.

4. The laundry wastewater treatment agent according to claim 1, characterized in that: The calcium peroxide / polypropylene composite particles are prepared by the following method: calcium peroxide powder and polypropylene chips are uniformly mixed, and then extruded and granulated by a screw extruder to obtain calcium peroxide / polypropylene composite particles.

5. The laundry wastewater treatment agent according to claim 4, characterized in that: The mass ratio of calcium peroxide powder to polypropylene chips is 0.01-0.1:

1.

6. The laundry wastewater treatment agent according to claim 4, characterized in that: The particle size of calcium peroxide powder is 1-10 μm.

7. The laundry wastewater treatment agent according to claim 4, characterized in that: The temperatures of zones 1 to 5 of the screw extruder are 175-185°C, 180-195°C, 195-210°C, 210-220°C, and 220-230°C, respectively.

8. The laundry wastewater treatment agent according to claim 1, characterized in that: The decolorizing agent is decolorizing agent JS.

9. The laundry wastewater treatment agent according to claim 1, characterized in that: Based on 100% of the total mass of the treatment agent, the treatment agent is made of the following raw materials in percentage by mass: 25% polyacrylonitrile-based activated carbon fiber, 8.4% polyaluminum ferrosilicate, 5% medical stone, 10.6% inorganic-organic hybrid polymer flocculant PAC-P (AM-BA), 5.9% decolorizer JS, 12% polylanthanum silicate, and the remainder is calcium peroxide / polypropylene composite particles.

10. A method for preparing a laundry wastewater treatment agent according to any one of claims 1 to 9, characterized in that: The polyacrylonitrile-based activated carbon fiber, polyaluminium ferrosilicate, medical stone, calcium peroxide / polypropylene composite particles, inorganic-organic hybrid polymer flocculant PAC-P (AM-BA), decolorizing agent and polylanthanum silicate are uniformly mixed in proportion to obtain a treatment agent.

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