Slaughter house sewage treatment method and water treatment agent

Abstract

The invention relates to the technical field of sewage treatment, and provides a slaughter house sewage treatment method and a water treatment agent.The water treatment agent.The water treatment agent.The water treatment agent.The water treatment agent.The water treatment agent.The water treatment agent.The water treatment agent.The water treatment agent.The water treatment agent.The water treatment agent.The water treatment agent is prepared from, by weight, 40-50 parts of chitosan, 20-40 parts of activated carbon, 18-26 parts of sodium polystyrenesulfonate, 4-18 parts of polyethyleneimine and 15-25 parts of inorganic polymeric flocculant. By means of the technical scheme, the problem that in the prior art, a water treatment agent is poor in removal effect on CODcr and animal fat in slaughter house sewage is solved.

Description

Technical Field

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

[0002] The main source of slaughterhouse wastewater is a series of wastewater discharged during the slaughtering process of the slaughterhouse, which contains a large amount of blood, fat, meat residue, fur and other substances, and has high content of organic pollutants, animal fats and oils, especially CODcr and animal fats. When the CODcr content in slaughterhouse wastewater is high, it means that the organic content in the water body exceeds the standard, which will cause water pollution after discharge. At the same time, when the CODcr content is high, it will have a toxic effect on aquatic organisms, causing the death or migration of aquatic organisms. In addition, animal fats are not easy to degrade in water bodies, and are easy to accumulate and cause eutrophication of water bodies, affecting the survival of aquatic organisms. Therefore, effective slaughterhouse wastewater treatment measures must be taken to reduce the CODcr and animal fat content in wastewater to protect the environment and human health.

[0003] In the process of slaughterhouse wastewater treatment, some water treatment agents are usually added to achieve the treatment of organic pollutants in the wastewater. However, the removal effect of organic matter in slaughterhouse wastewater by the currently used water treatment agents needs to be improved. Therefore, it is of great significance to develop a water treatment agent that can effectively remove CODcr and animal fats in slaughterhouse wastewater after using it in slaughterhouse wastewater treatment. Summary of the invention

[0004] The present invention provides a method for treating slaughterhouse wastewater and a water treatment agent, which solves the problem in the related art that the water treatment agent has a poor effect in removing CODcr and animal fat in slaughterhouse wastewater.

[0005] The technical solution of the present invention is as follows: The present invention provides a water treatment agent, the raw materials of which include the following components in parts by weight: 40-50 parts of chitosan, 20-40 parts of activated carbon, 18-26 parts of sodium polystyrene sulfonate, 4-18 parts of polyethyleneimine, and 15-25 parts of inorganic polymer flocculant.

[0006] As a further technical solution, the weight ratio of the sodium polystyrene sulfonate to polyethyleneimine is 2-4:1.

[0007] In the present invention, when the weight ratio of sodium polystyrene sulfonate to polyethyleneimine is 2-4:1, the removal effect of the water treatment agent on CODcr and animal fat in slaughterhouse wastewater can be further enhanced.

[0008] As a further technical solution, the activated carbon is modified activated carbon, and the raw materials of the modified activated carbon include activated carbon and hydroxynicotinic acid ethyl ester compounds.

[0009] In the present invention, activated carbon is modified by using hydroxynicotinic acid ethyl ester compounds. On the one hand, the activated carbon is easy to combine with other components in the water treatment agent to form a water treatment agent with a more stable structure. On the other hand, the adsorption activity of the activated carbon can be enhanced, so that it can effectively capture and remove organic pollutants in slaughterhouse wastewater, and further enhance the removal effect of the water treatment agent on CODcr and animal fat in slaughterhouse wastewater.

[0010] As a further technical solution, the hydroxynicotinic acid ethyl ester compound is one or both of 2,4-dihydroxy-6-methylnicotinic acid ethyl ester and 4,6-dihydroxynicotinic acid ethyl ester, preferably 2,4-dihydroxy-6-methylnicotinic acid ethyl ester.

[0011] As a further technical solution, the weight ratio of the activated carbon to the hydroxynicotinate ethyl ester compound is 5-29:1.

[0012] When the weight ratio of activated carbon to hydroxynicotinic acid ethyl ester compounds is 5~29:1, the removal effect of water treatment agents on CODcr and animal fats in slaughterhouse wastewater can be further enhanced.

[0013] As a further technical solution, the preparation method of the modified activated carbon comprises the following steps: dispersing the activated carbon evenly in dimethylformamide, adding the hydroxynicotinic acid ethyl ester compound, stirring, and drying to obtain the modified activated carbon.

[0014] As a further technical solution, the raw material of the modified activated carbon also includes sodium sulfite; the weight ratio of the hydroxynicotinic acid ethyl ester compound to the sodium sulfite is 1~5:1.

[0015] The inventors also found that when sodium sulfite is introduced into the process of modifying activated carbon with hydroxynicotinic acid ethyl ester compounds, the activated carbon is modified by sodium sulfite and hydroxynicotinic acid ethyl ester compounds together, which can further enhance the removal effect of water treatment agents on CODcr and animal fat in slaughterhouse wastewater. When and only when the weight ratio of hydroxynicotinic acid ethyl ester compounds to sodium sulfite is 1 to 5:1, the water treatment agent has the best removal effect on CODcr and animal fat in slaughterhouse wastewater. The reason may be that when sodium sulfite is present, the binding effect of activated carbon and hydroxynicotinic acid ethyl ester compounds can be further enhanced, making it easier to bind with animal fat and other organic pollutants in slaughterhouse wastewater, thereby further enhancing the removal effect of water treatment agents on CODcr and animal fat in slaughterhouse wastewater.

[0016] As a further technical solution, the preparation method of the modified activated carbon comprises the following steps: A1, dissolving the sodium sulfite in water to obtain a sodium sulfite solution, adding the activated carbon to the sodium sulfite solution, stirring evenly, and drying to obtain sodium sulfite modified activated carbon; A2. Dispersing the sodium sulfite modified activated carbon evenly in dimethylformamide, adding the hydroxynicotinic acid ethyl ester compound, and obtaining modified activated carbon.

[0017] As a further technical solution, in step A1, the mass fraction of the sodium sulfite solution is 20% to 27%.

[0018] As a further technical solution, the activated carbon is one or both of coconut shell activated carbon and wood activated carbon.

[0019] As a further technical solution, the inorganic polymer flocculant is one or more of polyaluminium sulfate, polyaluminium chloride and polyaluminium ferrosilicate.

[0020] The present invention also provides a method for preparing a water treatment agent, comprising the following steps: uniformly mixing the chitosan, activated carbon, sodium polystyrene sulfonate, polyethyleneimine and an inorganic polymer flocculant according to weight parts to obtain the water treatment agent.

[0021] The present invention also provides a method for treating slaughterhouse sewage, comprising the following steps: adding the water treatment agent into the slaughterhouse sewage and mixing the mixture evenly.

[0022] The working principle and beneficial effects of the present invention are: In the present invention, the raw materials of the water treatment agent include chitosan, activated carbon, sodium polystyrene sulfonate, polyethyleneimine, and inorganic polymer flocculant. Through the effective combination of the components, a water treatment agent with a stable structure can be prepared. When it is used for slaughterhouse sewage treatment, the CODcr and animal fat content in the sewage can be effectively reduced. Among them, sodium polystyrene sulfonate and polyethyleneimine are introduced into the raw materials of the water treatment agent. Sodium polystyrene sulfonate and polyethyleneimine have a synergistic effect. By reasonably regulating the weight ratio of the two, organic pollutants in slaughterhouse sewage can be effectively adsorbed, CODcr and animal fat content in slaughterhouse sewage can be effectively removed, and finally the treatment effect of the water treatment agent on slaughterhouse sewage can be enhanced. DETAILED DESCRIPTION

[0023] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0024] In the following examples and comparative examples, the deacetylation degree of chitosan is 99%, and the model is PRS184521; the activated carbon is coconut shell activated carbon, with a particle size of 425 mesh and a specific surface area of ​​1500m 2 / g; the weight average molecular weight of sodium polystyrene sulfonate is 70000, and the viscosity is 40mPa‧s; the model of polyethyleneimine is BL3, and the melting fluid velocity is 0.95g / 10min; the inorganic polymer flocculant is polyaluminum sulfate, the mesh size is 60, and the model is JY650.

[0025] Example 1 A water treatment agent, the raw materials include the following components in parts by weight: 40 parts of chitosan, 20 parts of activated carbon, 18 parts of sodium polystyrene sulfonate, 4 parts of polyethyleneimine, 15 parts of polyaluminium sulfate; A method for preparing a water treatment agent comprises the following steps: uniformly mixing the above components in parts by weight to obtain the water treatment agent.

[0026] Example 2 A water treatment agent, the raw materials include the following components in parts by weight: 45 parts of chitosan, 30 parts of activated carbon, 19 parts of sodium polystyrene sulfonate, 11 parts of polyethyleneimine, 20 parts of polyaluminium sulfate; A method for preparing a water treatment agent comprises the following steps: uniformly mixing the above components in parts by weight to obtain the water treatment agent.

[0027] Example 3 A water treatment agent, the raw materials include the following components in parts by weight: 50 parts of chitosan, 40 parts of activated carbon, 26 parts of sodium polystyrene sulfonate, 18 parts of polyethyleneimine, 25 parts of polyaluminium sulfate; A method for preparing a water treatment agent comprises the following steps: uniformly mixing the above components in parts by weight to obtain the water treatment agent.

[0028] Example 4 The only difference between this embodiment and embodiment 2 is that, in this embodiment, 25 parts of sodium polystyrene sulfonate and 5 parts of polyethyleneimine are added.

[0029] Example 5 The only difference between this embodiment and embodiment 2 is that in this embodiment, 20 parts of sodium polystyrene sulfonate and 10 parts of polyethyleneimine are added.

[0030] Example 6 The only difference between this embodiment and embodiment 2 is that in this embodiment, 24 parts of sodium polystyrene sulfonate and 6 parts of polyethyleneimine are added.

[0031] Example 7 The only difference between this embodiment and embodiment 6 is that in this embodiment, the activated carbon is modified activated carbon, and its preparation method includes the following steps: dispersing 24 parts of activated carbon in 15 parts of dimethylformamide evenly, adding 6 parts of 2,4-dihydroxy-6-methylnicotinate ethyl ester, stirring, and drying to obtain modified activated carbon.

[0032] Example 8 The only difference between this embodiment and embodiment 7 is that in this embodiment, 29.5 parts of activated carbon and 0.5 parts of 2,4-dihydroxy-6-methylnicotinate ethyl ester are added.

[0033] Example 9 The only difference between this embodiment and embodiment 7 is that in this embodiment, 29 parts of activated carbon and 1 part of 2,4-dihydroxy-6-methylnicotinate are added.

[0034] Example 10 The only difference between this embodiment and embodiment 7 is that in this embodiment, 25 parts of activated carbon and 5 parts of 2,4-dihydroxy-6-methylnicotinate ethyl ester are added.

[0035] Embodiment 11 The difference between this embodiment and embodiment 10 is that in this embodiment, the preparation method of modified activated carbon includes the following steps: A1. Dissolve 0.5 parts of sodium sulfite in water to obtain a sodium sulfite solution (mass fraction is 25%), add 25 parts of activated carbon to the sodium sulfite solution, stir evenly, and dry to obtain sodium sulfite modified activated carbon; A2. Disperse the sodium sulfite-modified activated carbon evenly in 15 parts of dimethylformamide, and add 5 parts of 2,4-dihydroxy-6-methylnicotinate ethyl to obtain modified activated carbon.

[0036] Example 12 The only difference between this embodiment and embodiment 11 is that, in this embodiment, 25 parts of activated carbon, 5 parts of 2,4-dihydroxy-6-methylnicotinate ethyl ester and 6 parts of sodium sulfite are added.

[0037] Example 13 The only difference between this embodiment and embodiment 11 is that, in this embodiment, 25 parts of activated carbon, 5 parts of 2,4-dihydroxy-6-methylnicotinate ethyl ester and 5 parts of sodium sulfite are added.

[0038] Embodiment 14 The only difference between this embodiment and embodiment 11 is that, in this embodiment, 25 parts of activated carbon, 5 parts of 2,4-dihydroxy-6-methylnicotinate ethyl ester and 1 part of sodium sulfite are added.

[0039] Comparative Example 1 The difference between this comparative example and Example 1 is that in this comparative example, polyethyleneimine is not added, and 22 parts of sodium polystyrene sulfonate are added.

[0040] Comparative Example 2 The difference between this comparative example and Example 1 is that in this comparative example, no sodium polystyrene sulfonate is added, and 22 parts of polyethyleneimine are added.

[0041] Comparative Example 3 The only difference between this comparative example and Example 1 is that in this comparative example, neither sodium polystyrene sulfonate nor polyethyleneimine is added.

[0042] Experimental example In the slaughterhouse sewage pool with a size of 10m×10m×3.5m, the effective water depth of the slaughterhouse sewage is 3m. The CODcr content in the slaughterhouse sewage before treatment was measured according to the method in HJ 6828-2017. The method of 637-2018 is used to determine the animal fat content in slaughterhouse wastewater before treatment, wherein the CODcr content is 693 mg / L and the animal fat content is 168 mg / L. The water treatment agents prepared in Examples 1 to 14 and Comparative Examples 1 to 2 are added to the slaughterhouse wastewater (the addition ratio is 2 g / L) and mixed evenly. After 3 days, the CODcr content and animal fat content in the slaughterhouse wastewater after treatment with the water treatment agent are determined according to the above standards, and the CODcr and animal fat removal rates are calculated according to the following formula: CODcr removal rate (%) = (CODcr content before treatment - CODcr content after treatment) / CODcr content before treatment × 100%, animal fat removal rate (%) = (animal fat content before treatment - animal fat content after treatment) / animal fat content before treatment × 100%. The test results are shown in Table 1 below.

[0043] Table 1 Treatment results of slaughterhouse wastewater by water treatment agents of Examples 1 to 14 and Comparative Examples 1 to 3

[0044] Compared with Comparative Examples 1 to 3, the CODcr removal rate and animal fat removal rate of Example 1 are significantly improved, indicating that when sodium polystyrene sulfonate and polyethyleneimine are introduced into the raw materials of the water treatment agent, sodium polystyrene sulfonate and polyethyleneimine have a synergistic effect, which can effectively enhance the water treatment agent's effect on the removal of CODcr and animal fat in slaughterhouse wastewater.

[0045] Compared with Examples 2 and 4, the CODcr removal rate and animal fat removal rate of Examples 5~6 are improved, indicating that when the weight ratio of sodium polystyrene sulfonate and polyethyleneimine is 2~4:1, the removal effect of water treatment agents on CODcr and animal fat in slaughterhouse wastewater can be further enhanced.

[0046] Compared with Example 6, the CODcr removal rate and animal fat removal rate of Examples 7 to 10 are improved, indicating that the use of hydroxynicotinic acid ethyl ester compounds to modify activated carbon can further enhance the removal effect of water treatment agents on CODcr and animal fat in slaughterhouse wastewater. Among them, compared with Examples 7 to 8, the CODcr removal rate and animal fat removal rate of Examples 9 to 10 are improved, indicating that when the weight ratio of activated carbon to hydroxynicotinic acid ethyl ester compounds is 5 to 29:1, the removal effect of water treatment agents on CODcr and animal fat in slaughterhouse wastewater can be further enhanced.

[0047] Compared with Example 10, the CODcr removal rate and animal fat removal rate of Examples 11 to 14 are improved, indicating that the use of sodium sulfite and hydroxynicotinic acid ethyl ester compounds to modify activated carbon can further enhance the removal effect of water treatment agents on CODcr and animal fat in slaughterhouse wastewater. Compared with Examples 11 to 12, the CODcr removal rate and animal fat removal rate of Examples 13 to 14 are improved, indicating that when the weight ratio of hydroxynicotinic acid ethyl ester compounds to sodium sulfite is 1 to 5:1, the removal effect of water treatment agents on CODcr and animal fat in slaughterhouse wastewater can be further enhanced.

[0048] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A water treatment agent, characterized in that: The raw materials include the following components in parts by weight: 40-50 parts of chitosan, 20-40 parts of activated carbon, 18-26 parts of sodium polystyrene sulfonate, 4-18 parts of polyethyleneimine, and 15-25 parts of inorganic polymer flocculant.

2. A water treatment agent according to claim 1, characterized in that: The weight ratio of the sodium polystyrene sulfonate to polyethyleneimine is 2-4:

1.

3. A water treatment agent according to claim 1, characterized in that: The activated carbon is modified activated carbon, and the raw materials of the modified activated carbon include activated carbon and hydroxynicotinic acid ethyl ester compounds.

4. A water treatment agent according to claim 3, characterized in that: The hydroxynicotinic acid ethyl ester compound is one or both of 2,4-dihydroxy-6-methylnicotinic acid ethyl ester and 4,6-dihydroxynicotinic acid ethyl ester.

5. A water treatment agent according to claim 3, characterized in that: The weight ratio of the activated carbon to the hydroxynicotinic acid ethyl ester compound is 5-29:

1.

6. A water treatment agent according to claim 3, characterized in that: The preparation method of the modified activated carbon comprises the following steps: dispersing the activated carbon evenly in dimethylformamide, adding the hydroxynicotinic acid ethyl ester compound, stirring, and drying to obtain the modified activated carbon.

7. A water treatment agent according to claim 3, characterized in that: The raw materials of the modified activated carbon also include sodium sulfite; the weight ratio of the hydroxynicotinic acid ethyl ester compound to the sodium sulfite is 1-5:

1.

8. A water treatment agent according to claim 7, characterized in that: The preparation method of the modified activated carbon comprises the following steps: A1, dissolving the sodium sulfite in water to obtain a sodium sulfite solution, adding the activated carbon to the sodium sulfite solution, stirring evenly, and drying to obtain sodium sulfite modified activated carbon; A2. Dispersing the sodium sulfite modified activated carbon evenly in dimethylformamide, adding the hydroxynicotinic acid ethyl ester compound, and obtaining modified activated carbon.

9. A water treatment agent according to claim 1, characterized in that: The activated carbon is one or both of coconut shell activated carbon and wood activated carbon; and / or The inorganic polymer flocculant is one or more of polyaluminium sulfate, polyaluminium chloride and polyaluminium ferrosilicate.

10. A method for treating slaughterhouse wastewater, characterized in that: The following steps are involved: Add the water treatment agent described in any one of claims 1 to 9 into the wastewater from a slaughterhouse and mix them evenly.

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