Preparation method of antibacterial sewage treatment agent

Abstract

The invention discloses a preparation method of an antibacterial sewage treatment agent, and belongs to the technical field of sewage treatment. The method comprises the following steps: S1, spraying diluted hydrochloric acid into calcium citrate in a stirring state, then adding water, and filtering out calcium citrate with an uneven surface; s2, adding calcium carbonate into the filtrate for reaction, and filtering out calcium citrate precipitate after reaction; s2, washing the calcium citrate precipitate and the calcium citrate obtained in the step S1 with water until a washing solution is neutral, filtering and drying to obtain a pretreated calcium citrate solid; and S3, uniformly mixing the pretreated calcium citrate prepared in the step S2 with polyacrylamide, polyferric chloride, a Chinese yam extract, an antibacterial agent and a heavy metal treatment agent in proportion to obtain the antibacterial sewage treatment agent. The obtained treatment agent has excellent flocculation, sterilization and heavy metal removal effects, and is more suitable for sewage purification treatment with complex pollutant types.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and more specifically, to a method for preparing an antibacterial sewage treatment agent. Background Art

[0002] At present, the methods for sewage treatment mainly include physical, chemical, biological, and comprehensive methods. The chemical method is to achieve the purpose of purification by adding sewage treatment agents to the water body. However, due to the complex types of pollutants in sewage, it is difficult for existing conventional water treatment agents to simultaneously and comprehensively and effectively treat multiple pollutants (such as COD, heavy metal ions, harmful bacteria, etc.), and the purification effect is not ideal. There are also problems such as repeated operations and complicated equipment in the treatment process. Therefore, providing a sewage treatment agent with strong treatment capacity that can remove multiple pollutants at the same time is a technical problem that needs to be solved urgently. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a method for preparing an antibacterial sewage treatment agent. The obtained treatment agent has excellent flocculation, sterilization and heavy metal removal effects and is more suitable for sewage purification treatment with complex types of pollutants.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A method for preparing an antibacterial sewage treatment agent comprises the following steps:

[0006] S1. Spray dilute hydrochloric acid into the calcium citrate under stirring, then add water, and filter out the calcium citrate with an uneven surface;

[0007] S2, adding calcium carbonate to the filtrate to react, filtering out the calcium citrate precipitate after the reaction; washing the calcium citrate precipitate and the calcium citrate obtained in step S1 with water until the washing liquid is neutral, filtering and drying to obtain the pretreated calcium citrate solid;

[0008] S3. The pretreated calcium citrate obtained in step S2 is uniformly mixed with polyacrylamide, polyferric chloride, yam extract, antibacterial agent, and heavy metal treatment agent in proportion to obtain an antibacterial wastewater treatment agent.

[0009] The present invention is further configured such that the raw material components in step S2 are: 5-15 parts by mass of pretreated calcium citrate, 28-50 parts by mass of polyacrylamide, 10-20 parts by mass of polyferric chloride, 10-20 parts by mass of yam extract, 2-8 parts by mass of antibacterial agent, and 3-6 parts by mass of heavy metal treatment agent.

[0010] The present invention is further configured such that, in step S1, the concentration of dilute hydrochloric acid is 1 mol / L, and the molar ratio of calcium citrate to dilute hydrochloric acid is (2-4.3):6.

[0011] The present invention is further configured such that, in step S1, the volume ratio of the added water to the diluted hydrochloric acid is (1-1.2):1.

[0012] The present invention is further configured such that the molar ratio of the calcium carbonate added in step S2 to the dilute hydrochloric acid added in step S1 is 3:1.

[0013] The present invention is further configured such that the antibacterial agent is at least one of a rare earth antibacterial agent and an inorganic antibacterial agent.

[0014] The present invention is further configured such that the antibacterial agent is a composition of nano-lanthanum oxide and titanium dioxide.

[0015] The present invention is further configured such that the heavy metal treatment agent is at least one of a heavy metal capture agent and a heavy metal adsorbent.

[0016] The present invention is further configured such that the heavy metal treatment agent is MT300 heavy metal capture agent.

[0017] The present invention is further configured as follows: in step S1, the concentration of dilute hydrochloric acid is 1 mol / L, and the molar ratio of calcium citrate to dilute hydrochloric acid is 2.5:6; in step S2, the raw material components are: 12.3 parts by mass of pretreated calcium citrate, 41.2 parts by mass of polyacrylamide, 17.5 parts by mass of polyferric chloride, 20 parts by mass of yam extract, 5 parts by mass of a composition of nano lanthanum oxide and titanium dioxide, and 4 parts by mass of MT300 heavy metal scavenger.

[0018] In summary, the present invention has the following beneficial effects:

[0019] The present invention prepares a sewage treatment agent by compounding calcium citrate, polyacrylamide, polyferric chloride, yam extract, antibacterial agent and metal treatment agent, which can simultaneously and comprehensively and effectively treat multiple pollutants (COD, heavy metal ions, harmful bacteria, etc.); the surface of part of the calcium citrate is made uneven by using dilute hydrochloric acid, thereby further improving the comprehensive sewage treatment effect; in particular, yam extract, nano lanthanum oxide and MT300 heavy metal scavenger are added to prepare the sewage treatment agent, and the synergistic effect among the three is utilized to further improve the flocculation and antibacterial effects. DETAILED DESCRIPTION

[0020] 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.

[0021] The method for preparing the antibacterial sewage treatment agent of the present invention comprises the following steps:

[0022] S1. Spray dilute hydrochloric acid into the calcium citrate under stirring, the concentration of the dilute hydrochloric acid is 1 mol / L, and the molar ratio of calcium citrate to dilute hydrochloric acid is (2-4.3):6; then add water, the volume ratio of the added water to the dilute hydrochloric acid is (1-1.2):1, and filter out the calcium citrate with an uneven surface. In this step, a part of the calcium citrate reacts with the dilute hydrochloric acid to generate citric acid and calcium chloride, making the surface of the calcium citrate uneven, increasing the specific surface area of ​​the calcium citrate, and helping to improve the flocculation effect.

[0023] S2, adding calcium carbonate to the filtrate for reaction (the molar ratio of calcium carbonate to the dilute hydrochloric acid added in step S1 is 3:1), filtering out the calcium citrate precipitate after the reaction; washing the calcium citrate precipitate and the calcium citrate obtained in step S1 with water until the washing liquid is neutral, filtering and drying to obtain pretreated calcium citrate solid. In this step, calcium carbonate reacts with citric acid in the filtrate to generate calcium citrate, which can be used as an antibacterial agent for sewage treatment.

[0024] S3, 5-15 parts by mass of pretreated calcium citrate obtained in step S2, 28-50 parts by mass of polyacrylamide, 10-20 parts by mass of polyferric chloride, 10-20 parts by mass of yam extract, 2-8 parts by mass of antibacterial agent, and 3-6 parts by mass of heavy metal treatment agent are mixed uniformly to obtain an antibacterial sewage treatment agent. In this step, the antibacterial agent is at least one of a rare earth antibacterial agent and an inorganic antibacterial agent, preferably a combination of nano lanthanum oxide and titanium dioxide. The heavy metal treatment agent is at least one of a heavy metal collector and a heavy metal adsorbent, preferably MT300 heavy metal collector purchased from Shanghai Langying Water Treatment Technology Co., Ltd.

[0025] The preferred embodiments are as follows:

[0026] Example 1

[0027] S1. Spray 1 mol / L dilute hydrochloric acid into the calcium citrate under stirring, the molar ratio of calcium citrate to dilute hydrochloric acid being 2.5:6; then add water, the volume ratio of the added water to the dilute hydrochloric acid being 1:1, and filter out the calcium citrate with an uneven surface;

[0028] S2, adding calcium carbonate to the filtrate for reaction (the molar ratio of calcium carbonate to the dilute hydrochloric acid added in step S1 is 3:1), filtering out the calcium citrate precipitate after the reaction; washing the calcium citrate precipitate and the calcium citrate obtained in step S1 with water until the washing liquid is neutral, filtering and drying to obtain the pretreated calcium citrate solid;

[0029] S3. Evenly mix 12.3 parts by mass of pretreated calcium citrate obtained in step S2 with 42.2 parts by mass of polyacrylamide, 17.5 parts by mass of polyferric chloride, 20 parts by mass of yam extract, 2 parts by mass of nano lanthanum oxide, 2 parts by mass of titanium dioxide, and 4 parts by mass of MT300 heavy metal scavenger to obtain an antibacterial wastewater treatment agent.

[0030] Example 2

[0031] The sewage treatment agent was prepared according to Example 1, except that the mass of nano lanthanum oxide was replaced by titanium dioxide.

[0032] Comparative Example 1

[0033] The sewage treatment agent was prepared according to Example 1, but the yam extract was not added and was replaced by polyacrylamide.

[0034] Comparative Example 2

[0035] The sewage treatment agent was prepared according to Example 1, except that the mass of MT300 heavy metal scavenger was replaced by polyacrylamide.

[0036] Comparative Example 3

[0037] 12.3 parts by mass of conventional commercially available calcium citrate are uniformly mixed with 41.2 parts by mass of polyacrylamide, 17.5 parts by mass of polyferric chloride, 20 parts by mass of yam extract, 5 parts by mass of a composition of nano lanthanum oxide and titanium dioxide, and 4 parts by mass of MT300 heavy metal scavenger to obtain an antibacterial sewage treatment agent.

[0038] The sewage treatment agents prepared in Examples 1-2 and Comparative Examples 1-3 were tested for domestic sewage treatment effects (the treated sewage was homemade sewage containing conventional organic matter, heavy metals, harmful bacteria and other pollutants that simulated domestic sewage). The treatment effects are shown in Table 1.

[0039] Table 1

[0040]

[0041] As shown in Table 1, the sewage treatment agent prepared by the method of the present invention has excellent flocculation, sterilization and heavy metal removal effects. By comparing the experimental data of Example 1 with Example 2, Comparative Example 1 and Comparative Example 2, it can be seen that the nano-lanthanum oxide, yam extract and MT300 heavy metal scavenger have a synergistic effect, which can further improve the treatment effect of the sewage treatment agent. By comparing the experimental data of Example 1 and Comparative Example 3, it can be seen that the calcium citrate with a concave-convex surface treatment is beneficial to improving the treatment effect of the sewage treatment agent.

[0042] 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 method for preparing an antibacterial sewage treatment agent, characterized in that: The following steps are involved: S1. Spray dilute hydrochloric acid into the calcium citrate under stirring, then add water, and filter out the calcium citrate with an uneven surface; S2, adding calcium carbonate to the filtrate to react, filtering out the calcium citrate precipitate after the reaction; washing the calcium citrate precipitate and the calcium citrate obtained in step S1 with water until the washing liquid is neutral, filtering and drying to obtain the pretreated calcium citrate solid; S3, the pretreated calcium citrate obtained in step S2 is mixed evenly with polyacrylamide, polyferric chloride, yam extract, antibacterial agent, and heavy metal treatment agent in proportion to obtain an antibacterial wastewater treatment agent.

2. The method for preparing an antibacterial sewage treatment agent according to claim 1, characterized in that: The raw material components in step S2 are: 5-15 parts by weight of pretreated calcium citrate, 28-50 parts by weight of polyacrylamide, 10-20 parts by weight of polyferric chloride, 10-20 parts by weight of yam extract, 2-8 parts by weight of antibacterial agent, and 3-6 parts by weight of heavy metal treatment agent.

3. The method for preparing an antibacterial sewage treatment agent according to claim 1, characterized in that: In step S1, the concentration of dilute hydrochloric acid is 1 mol / L, and the molar ratio of calcium citrate to dilute hydrochloric acid is (2-4.3):

6.

4. The method for preparing an antibacterial sewage treatment agent according to claim 1, characterized in that: In step S1, the volume ratio of the added water to the diluted hydrochloric acid is (1-1.2):

1.

5. The method for preparing an antibacterial sewage treatment agent according to claim 1, characterized in that: The molar ratio of calcium carbonate added in step S2 to the dilute hydrochloric acid added in step S1 is 3:

1.

6. The method for preparing an antibacterial sewage treatment agent according to claim 1, characterized in that: The antibacterial agent is at least one of a rare earth antibacterial agent and an inorganic antibacterial agent.

7. The method for preparing an antibacterial sewage treatment agent according to claim 1, characterized in that: The antibacterial agent is a composition of nano lanthanum oxide and titanium dioxide.

8. The method for preparing an antibacterial sewage treatment agent according to claim 1, characterized in that: The heavy metal treatment agent is at least one of a heavy metal capture agent and a heavy metal adsorbent.

9. The method for preparing an antibacterial sewage treatment agent according to claim 1, characterized in that: The heavy metal treatment agent is MT300 heavy metal collector.

10. The method for preparing an antibacterial sewage treatment agent according to claim 1, characterized in that: In step S1, the concentration of dilute hydrochloric acid is 1 mol / L, and the molar ratio of calcium citrate to dilute hydrochloric acid is 2.5:6; in step S2, the raw material components are: 12.3 parts by mass of pretreated calcium citrate, 41.2 parts by mass of polyacrylamide, 17.5 parts by mass of polyferric chloride, 20 parts by mass of yam extract, 5 parts by mass of a composition of nano lanthanum oxide and titanium dioxide, and 4 parts by mass of MT300 heavy metal scavenger.

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