Sewage treatment agent and sewage treatment method

Abstract

The invention relates to the technical field of sewage treatment, and provides a sewage treatment agent and a sewage treatment method.The sewage treatment agent is prepared from, by weight, 30-40 parts of modified montmorillonite, 10-15 parts of humic acid, 15-20 parts of polyacrylate, 8-14 parts of sodium p-styrenesulfonate-maleic anhydride copolymer and 14-24 parts of polymeric chloride; the modified montmorillonite is prepared from montmorillonite and an aromatic hydroxy acid compound. Through the technical scheme, the problem of poor sewage treatment effect of a sewage treatment agent in related technologies is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a sewage treatment agent and a sewage treatment method. Background Art

[0002] In recent years, with the continuous improvement of people's living standards, the demand for meat has gradually increased. Slaughterhouses have also been growing and becoming one of the pillar industries to ensure the supply of meat in my country. As slaughterhouses grow and develop, the generation of livestock and poultry slaughtering wastewater has also been increasing. Slaughterhouse wastewater comes from the process of slaughtering livestock and poultry, removing hair, cleaning internal organs, etc. The wastewater contains a large amount of animal fur, grease, blood, feces and other filth, among which the content of organic pollutants is relatively high, such as COD cr , BOD5, ammonia nitrogen, SS and other indicators are all high, especially ammonia nitrogen. Ammonia nitrogen is one of the important nutrients for plant growth. When the ammonia nitrogen content is too high, it will stimulate the excessive reproduction of plankton such as algae, directly leading to eutrophication of water bodies and deterioration of the ecological environment of the water system. At present, there are many kinds of sewage treatment agents that can be used to treat slaughterhouse wastewater, but the use process is time-consuming and labor-intensive, and the effect of reducing the ammonia nitrogen content in the sewage is poor, and it is impossible to achieve the purpose of reducing costs and increasing efficiency in the treatment of slaughterhouse wastewater. Therefore, the development of a sewage treatment agent to treat slaughterhouse wastewater can effectively reduce the ammonia nitrogen content therein and reduce the cost of slaughterhouse wastewater treatment, which is of great significance to the protection of the ecological environment and human health. Summary of the Invention

[0003] The present invention provides a sewage treatment agent and a sewage treatment method, which solves the problem that the sewage treatment agent in the related art has poor sewage treatment effect.

[0004] The technical solutions of the present invention are as follows: The present invention provides a sewage treatment agent, the raw materials of which include the following components in parts by weight: 30-40 parts of modified montmorillonite, 10-15 parts of humic acid, 15-20 parts of polyacrylate, 8-14 parts of sodium styrene sulfonate-maleic anhydride copolymer, and 14-24 parts of polychloride; The raw materials of the modified montmorillonite include montmorillonite and an aromatic hydroxy acid compound.

[0005] As a further technical solution, the weight ratio of the montmorillonite to the aromatic hydroxy acid compound is 8-35:1.

[0006] When the weight ratio of montmorillonite to aromatic hydroxy acid compounds is 8~35:1, the removal rate of ammonia nitrogen in slaughterhouse wastewater can be further improved, thereby further improving the treatment effect of the sewage treatment agent on sewage.

[0007] As a further technical solution, the aromatic hydroxy acid compound includes one or more of 2-hydroxypyridine-3-carboxylic acid, 2-hydroxy-6-naphthoic acid, and 3-hydroxyquinaldine-4-carboxylic acid, preferably 3-hydroxyquinaldine-4-carboxylic acid.

[0008] As a further technical solution, the preparation method of the modified montmorillonite includes the following steps: dissolving the aromatic hydroxy acid compound in ethanol to obtain an aromatic hydroxy acid compound solution, adding the montmorillonite to the aromatic hydroxy acid compound solution, dispersing evenly, and drying to obtain the modified montmorillonite.

[0009] As a further technical solution, the mass fraction of the aromatic hydroxy acid compound solution is 3% to 7%.

[0010] As a further technical solution, the raw material of the modified montmorillonite further includes dithioacetamide.

[0011] When the raw material for modifying montmorillonite also includes dithioacetamide, modifying the montmorillonite with both aromatic hydroxy acid compounds and dithioacetamide can further increase the removal rate of ammonia nitrogen from slaughterhouse wastewater, thereby further improving the treatment effect of the sewage treatment agent on the wastewater. This is speculated to be because the addition of dithioacetamide promotes better binding between the aromatic hydroxy acid compounds and montmorillonite, resulting in a more uniform distribution of the montmorillonite in the slaughterhouse wastewater system, further promoting its binding and removal of ammonia nitrogen pollutants in the wastewater, and thus further improving the treatment effect of the sewage treatment agent on the wastewater.

[0012] As a further technical solution, the weight ratio of the aromatic hydroxy acid compound to dithioacetamide is 1-3:1.

[0013] When the weight ratio of aromatic hydroxy acid compounds and dithioacetamide is 1~3:1, the removal rate of ammonia nitrogen in slaughterhouse wastewater can be further improved by reasonably regulating the weight ratio of the two, thereby further improving the treatment effect of the wastewater treatment agent on wastewater.

[0014] As a further technical solution, the preparation method of the modified montmorillonite includes the following steps: dispersing the montmorillonite in ethanol, adding the aromatic hydroxy acid compound and the dithioacetamide, stirring evenly to obtain a mixture, and drying the mixture to obtain the modified montmorillonite.

[0015] As a further technical solution, the mass fraction of the mixture is 10% to 15%.

[0016] As a further technical solution, the polyacrylate includes one or both of sodium polyacrylate and calcium polyacrylate.

[0017] As a further technical solution, the polychloride includes one or both of polyaluminum chloride and polyferric chloride.

[0018] The present invention also provides a method for preparing the sewage treatment agent, comprising the following steps: uniformly mixing the components in parts by weight to obtain the sewage treatment agent.

[0019] The present invention also provides a sewage treatment method, which comprises mixing the sewage treatment agent with slaughterhouse sewage.

[0020] As a further technical solution, the mass volume ratio of the sewage treatment agent to the slaughterhouse sewage is 0.5~1.5:1 in g / L.

[0021] The working principle and beneficial effects of the present invention are: In the present invention, the sewage treatment agent formed by the combination of modified montmorillonite, humic acid, polyacrylate, sodium styrene sulfonate-maleic anhydride copolymer, and polychloride is simple to prepare, low in cost, and has excellent treatment effect on slaughterhouse sewage, and can achieve the purpose of reducing costs and increasing efficiency in slaughterhouse sewage treatment. Among them, the modified montmorillonite is made by surface-modifying montmorillonite with an aromatic hydroxy acid compound. The aromatic hydroxy acid compound contains aromatic groups as well as hydroxyl and carboxyl active groups. The aromatic hydroxy acid compound is used to modify the montmorillonite, increasing the surface active sites of the montmorillonite while making the montmorillonite better dispersed in the sewage system, thereby helping to better remove ammonia nitrogen pollutants in slaughterhouse sewage, and significantly enhancing the sewage treatment effect of the sewage treatment agent on sewage. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0023] In the following examples and comparative examples, the particle size of montmorillonite is 325 mesh; the polyacrylate is sodium polyacrylate with a weight-average molecular weight of 5000 and a model number of Derin 42N; the model number of sodium styrene sulfonate-maleic anhydride copolymer is 3000-P; the polychloride is polyaluminum chloride with a model number of ZY-203; the humic acid is ww-153 with a particle size of 100 mesh and is manufactured by Xinyi Yifan Trading Co., Ltd.

[0024] Example 1 A sewage treatment agent, the raw materials of which include the following components in parts by weight: 30 parts of modified montmorillonite, 10 parts of humic acid, 15 parts of sodium polyacrylate, 8 parts of sodium styrene sulfonate-maleic anhydride copolymer, and 14 parts of polyaluminium chloride; The raw materials of modified montmorillonite include 26 parts of montmorillonite and 4 parts of 3-hydroxyquinaldine-4-carboxylic acid; The preparation method of modified montmorillonite comprises the following steps: dissolving 4 parts of 3-hydroxyquinaldine-4-carboxylic acid in ethanol to obtain a 3-hydroxyquinaldine-4-carboxylic acid solution with a mass fraction of 4%, adding 26 parts of montmorillonite to the 3-hydroxyquinaldine-4-carboxylic acid solution with a mass fraction of 4%, dispersing the mixture evenly, and drying the mixture to obtain modified montmorillonite; A method for preparing a sewage treatment agent comprises the following steps: uniformly mixing the above components in parts by weight to obtain the sewage treatment agent.

[0025] Example 2 A sewage treatment agent, the raw materials of which include the following components in parts by weight: 36 parts of modified montmorillonite, 13 parts of humic acid, 18 parts of sodium polyacrylate, 11 parts of sodium styrene sulfonate-maleic anhydride copolymer, and 19 parts of polyaluminium chloride; The raw materials of the modified montmorillonite include 31 parts of montmorillonite and 5 parts of 3-hydroxyquinaldine-4-carboxylic acid; The preparation method of modified montmorillonite comprises the following steps: dissolving 5 parts of 3-hydroxyquinaldine-4-carboxylic acid in ethanol to obtain a 3-hydroxyquinaldine-4-carboxylic acid solution with a mass fraction of 4%, adding 31 parts of montmorillonite to the 3-hydroxyquinaldine-4-carboxylic acid solution with a mass fraction of 4%, dispersing the mixture evenly, and drying the mixture to obtain modified montmorillonite; A method for preparing a sewage treatment agent comprises the following steps: uniformly mixing the above components in parts by weight to obtain the sewage treatment agent.

[0026] Example 3 A sewage treatment agent, the raw materials of which include the following components in parts by weight: 40 parts of modified montmorillonite, 15 parts of humic acid, 20 parts of sodium polyacrylate, 14 parts of sodium styrene sulfonate-maleic anhydride copolymer, and 24 parts of polyaluminium chloride; The raw materials of modified montmorillonite include 35 parts of montmorillonite and 5 parts of 3-hydroxyquinaldine-4-carboxylic acid; The preparation method of modified montmorillonite comprises the following steps: dissolving 5 parts of 3-hydroxyquinaldine-4-carboxylic acid in ethanol to obtain a 3-hydroxyquinaldine-4-carboxylic acid solution with a mass fraction of 4%, adding 35 parts of montmorillonite to the 3-hydroxyquinaldine-4-carboxylic acid solution with a mass fraction of 4%, dispersing the mixture evenly, and drying the mixture to obtain modified montmorillonite; A method for preparing a sewage treatment agent comprises the following steps: uniformly mixing the above components in parts by weight to obtain the sewage treatment agent.

[0027] Example 4 The only difference between this embodiment and embodiment 2 is that, in this embodiment, the raw materials of the modified montmorillonite include 35.5 parts of montmorillonite and 0.5 parts of 3-hydroxyquinaldine-4-carboxylic acid.

[0028] Example 5 The only difference between this embodiment and embodiment 2 is that, in this embodiment, the raw materials of the modified montmorillonite include 35 parts of montmorillonite and 1 part of 3-hydroxyquinaldine-4-carboxylic acid.

[0029] Example 6 The only difference between this embodiment and embodiment 2 is that, in this embodiment, the raw materials of the modified montmorillonite include 32 parts of montmorillonite and 4 parts of 3-hydroxyquinaldine-4-carboxylic acid.

[0030] Example 7 The only difference between this embodiment and Example 6 is that, in this embodiment, the raw materials of the modified montmorillonite include 32 parts of montmorillonite, 1 part of 3-hydroxyquinaldine-4-carboxylic acid and 3 parts of dithioacetamide, and the preparation method of the modified montmorillonite includes the following steps: dispersing 32 parts of montmorillonite in ethanol, adding 1 part of 3-hydroxyquinaldine-4-carboxylic acid and 3 parts of dithioacetamide, and stirring uniformly to obtain a mixture with a mass fraction of 12%, and concentrating the mixture with a mass fraction of 12% to obtain modified montmorillonite.

[0031] Example 8 The only difference between this embodiment and embodiment 7 is that, in this embodiment, the raw materials of the modified montmorillonite include 32 parts of montmorillonite, 3.5 parts of 3-hydroxyquinaldine-4-carboxylic acid and 0.5 parts of dithioacetamide.

[0032] Example 9 The only difference between this embodiment and embodiment 7 is that, in this embodiment, the raw materials of the modified montmorillonite include 32 parts of montmorillonite, 2 parts of 3-hydroxyquinaldine-4-carboxylic acid and 2 parts of dithioacetamide.

[0033] Example 10 The only difference between this embodiment and embodiment 7 is that, in this embodiment, the raw materials of the modified montmorillonite include 32 parts of montmorillonite, 3 parts of 3-hydroxyquinaldine-4-carboxylic acid and 1 part of dithioacetamide.

[0034] Comparative Example 1 The only difference between this comparative example and Example 1 is that in this comparative example, 30 parts of modified montmorillonite are replaced by an equal amount of montmorillonite.

[0035] Comparative Example 2 A sewage treatment agent, the raw materials of which include the following components in parts by weight: 26 parts of montmorillonite, 4 parts of 3-hydroxyquinaldine-4-carboxylic acid, 10 parts of humic acid, 15 parts of sodium polyacrylate, 8 parts of sodium styrene sulfonate-maleic anhydride copolymer, and 14 parts of polyaluminium chloride; A method for preparing a sewage treatment agent comprises the following steps: uniformly mixing the above components in parts by weight to obtain the sewage treatment agent.

[0036] Experimental example In a slaughterhouse sewage pool with a size of 10m×10m×5.5m, the effective water depth of the slaughterhouse sewage is 5m. The ammonia nitrogen content of the slaughterhouse sewage before treatment was determined according to the method in HJ537-2009 "Determination of Ammonia Nitrogen in Water Quality - Distillation-Neutralization Titration Method", and the content was 70.40 mg / L. The sewage treatment agents prepared in Examples 1 to 10 and Comparative Examples 1 to 2 were respectively mixed with the slaughterhouse sewage at a ratio of 1g:1L. After 3 days, the ammonia nitrogen content in the slaughterhouse sewage after treatment was determined according to the above standard, and the ammonia nitrogen removal rate was calculated according to the following formula: Ammonia nitrogen removal rate (%) = (ammonia nitrogen content before treatment - ammonia nitrogen content after treatment) / ammonia nitrogen content before treatment × 100%. The test results are shown in Table 1 below.

[0037] Table 1 Treatment results of slaughterhouse wastewater by the sewage treatment agents of Examples 1 to 10 and Comparative Examples 1 to 2

[0038] Compared with Comparative Examples 1 to 2, after the sewage treatment agent prepared in Example 1 was used for slaughterhouse sewage treatment, the ammonia nitrogen content in the slaughterhouse sewage was significantly reduced and the removal rate was significantly improved, indicating that the surface modification of montmorillonite using aromatic hydroxy acid compounds can better remove ammonia nitrogen pollutants in slaughterhouse sewage and significantly enhance the treatment effect of the sewage treatment agent on sewage.

[0039] Compared with Examples 2 and 4, after the sewage treatment agent prepared in Examples 5 to 6 was used for the treatment of slaughterhouse sewage, the ammonia nitrogen content in the slaughterhouse sewage was reduced and the removal rate was improved, indicating that when the weight ratio of montmorillonite and aromatic hydroxy acid compounds is 8 to 35:1, the removal rate of ammonia nitrogen in slaughterhouse sewage can be further improved, thereby further improving the treatment effect of the sewage treatment agent on sewage.

[0040] Compared with Example 6, the sewage treatment agents prepared in Examples 7 to 10, after being used to treat slaughterhouse sewage, reduced the ammonia nitrogen content in the sewage and increased the removal rate. This indicates that when montmorillonite is modified with aromatic hydroxy acid compounds and dithioacetamide, the removal rate of ammonia nitrogen in slaughterhouse sewage can be further increased, thereby further improving the sewage treatment effect of the sewage treatment agent on sewage. Compared with Examples 7 to 8, the sewage treatment agents prepared in Examples 9 to 10, after being used to treat slaughterhouse sewage, reduced the ammonia nitrogen content in the sewage and increased the removal rate. This indicates that when the weight ratio of aromatic hydroxy acid compounds to dithioacetamide is 1 to 3:1, the removal rate of ammonia nitrogen in slaughterhouse sewage can be further increased, thereby further improving the sewage treatment effect of the sewage treatment agent on sewage.

[0041] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A sewage treatment agent, characterized in that: The raw materials include the following components in parts by weight: 30-40 parts of modified montmorillonite, 10-15 parts of humic acid, 15-20 parts of polyacrylate, 8-14 parts of sodium styrene sulfonate-maleic anhydride copolymer, and 14-24 parts of polychloride; The raw materials of the modified montmorillonite include montmorillonite and an aromatic hydroxy acid compound.

2. A sewage treatment agent according to claim 1, characterized in that: The weight ratio of the montmorillonite to the aromatic hydroxy acid compound is 8-35:

1.

3. A sewage treatment agent according to claim 1, characterized in that: The aromatic hydroxy acid compound includes one or more of 2-hydroxypyridine-3-carboxylic acid, 2-hydroxy-6-naphthoic acid, and 3-hydroxyquinaldine-4-carboxylic acid.

4. A sewage treatment agent according to claim 1, characterized in that: The preparation method of the modified montmorillonite comprises the following steps: dissolving the aromatic hydroxy acid compound in ethanol to obtain an aromatic hydroxy acid compound solution, adding the montmorillonite to the aromatic hydroxy acid compound solution, dispersing evenly, and drying to obtain the modified montmorillonite.

5. A sewage treatment agent according to claim 1, characterized in that: The raw material of the modified montmorillonite also includes dithioacetamide.

6. A sewage treatment agent according to claim 5, characterized in that: The weight ratio of the aromatic hydroxy acid compound to dithioacetamide is 1-3:

1.

7. A sewage treatment agent according to claim 5, characterized in that: The preparation method of the modified montmorillonite comprises the following steps: dispersing the montmorillonite in ethanol, adding the aromatic hydroxy acid compound and the dithioacetamide, stirring evenly to obtain a mixture, and drying the mixture to obtain the modified montmorillonite.

8. A sewage treatment agent according to claim 1, characterized in that: The polyacrylate includes one or both of sodium polyacrylate and calcium polyacrylate.

9. A sewage treatment agent according to claim 1, characterized in that: The polychloride includes one or both of polyaluminium chloride and polyferric chloride.

10. A method for treating sewage, characterized in that: Mix a sewage treatment agent as described in any one of claims 1 to 9 with slaughterhouse sewage.

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