Water treatment agent, method for producing and using the same, and recovery device

Abstract

The present application relates to the field of sewage treatment, to solve the problem that the existing water treatment agent is restricted by each other when treating organic matter and heavy metal at the same time, and provide a water treatment agent suitable for natural environment and recycling and a device specially used for recycling the water treatment agent, the water treatment agent comprises: bacteria, carrier and shell; the bacteria is loaded on the carrier; the carrier is located in the shell; the shell has a through hole; the surface of the carrier is also attached with sodium hydrosulfite and alkaline salt; the shell is chelating resin; the carrier comprises a magnetically attractable metal. The present application changes the conventional sewage treatment idea, and applies before the pesticide migrates with water, effectively avoids the spread of the pollution source, especially to the soil and groundwater. At the same time, the volume of water is reduced, and the amount of water treatment agent is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sewage treatment, in particular to a water treatment agent, a preparation method and application of the water treatment agent, and a recovery device.

[0002] The present application relates to the field of sewage treatment, in particular to a water treatment agent, a preparation method and application of the water treatment agent, and a recovery device. BACKGROUND

[0003] The pollution of water bodies by pesticides mainly comes from: direct application of pesticides to water bodies; migration of pesticides applied in farmland to water bodies with rainwater or irrigation water; discharge of wastewater from pesticide production and processing enterprises; residual pesticides in the atmosphere entering water bodies with rainfall; pesticide droplets or dust particles settling into water bodies during the use of pesticide application tools and equipment; and the like. The pollution of water bodies by pesticides is mainly the pollution of organic matter and heavy metals, such as polycyclic aromatic hydrocarbons, polychlorinated biphenyls, cadmium, copper, zinc, etc. In addition, heavy metals in pesticides are also prone to migrate to soil, causing soil pollution. The combined pollution of heavy metals and pesticides can affect the enzyme activity of the rhizosphere soil, and further affect the normal growth of plants. At present, the treatment of sewage in the environment mainly relies on centralized treatment in sewage treatment plants.

[0004] The patent with publication number CN115318269A discloses a biochar wastewater treatment agent and a preparation method and use method thereof. The biochar wastewater treatment agent is prepared by loading persulfate on a carrier to generate more sulfate radicals, which has a removal effect on organic pollutants and heavy metal ions in wastewater. However, the degradation ability of persulfate on organic matter is weak, only about 40%, and inorganic acid is generated after the degradation of organic matter, which is difficult to be applied in the plant growth environment, such as farmland.

[0005] The patent with publication number CN113087283A discloses a foamy solid-loaded microbial filler for wastewater treatment and a preparation method thereof. The foamy solid-loaded microbial filler is prepared by loading microorganisms on a composite polyurethane foam, and the microorganisms degrade organic matter. In addition, a chelating adsorbent is added to the carrier to treat heavy metals in water. However, organic acid is generated during the microbial degradation process, which affects the adsorption effect of the chelating adsorbent on heavy metals, and heavy metals also affect the activity of microorganisms, and the chelating adsorbent is difficult to regenerate. SUMMARY

[0006] The present application relates to the field of sewage treatment, in particular to a water treatment agent, a preparation method and application of the water treatment agent, and a recovery device.

[0007] The present application is achieved by the following method scheme:

[0008] A water treatment agent, comprising: a bacterial body, a carrier and a shell; the bacterial body is loaded on the carrier; the carrier is located in the shell; the shell has a through hole; the surface of the carrier is further attached with sodium hydrosulfite and an alkaline salt; the shell is a chelating resin; and the carrier comprises a magnetically attractable metal.

[0009] The chelating resin as the shell can adsorb heavy metals in water, avoiding the influence of the heavy metals on the activity of the bacterial body. The alkaline salt can neutralize organic acids produced by microbial metabolism, avoiding the influence of the organic acids on the adsorption effect of the chelating resin on the heavy metals. The carrier comprising the magnetically attractable metal not only provides a loading for the microorganism, but also makes the water treatment agent easy to be magnetically separated. The sodium hydrosulfite can provide an anoxic environment for anaerobic bacteria.

[0010] Preferably, the density of the water treatment agent is less than or equal to that of water; the density of the shell is less than that of water; and the density of the carrier is greater than that of water.

[0011] Before pesticide is sprayed in a farmland, water is generally drained, so that the water layer in the farmland is very shallow. In this way, the growth of rice is met, and the efficiency of the pesticide is improved. Therefore, when the water treatment agent is applied, even if it floats on the water surface, a good decontamination effect can also be achieved. The water treatment agent with a special density structure is adopted in the present application, so that the water treatment agent as a whole floats, but the carrier is in the water. The microorganism in the carrier can be in full contact with the water body to degrade organic matter, and the water treatment agent is also avoided from sinking to the bottom, so that the difficulty of magnetic separation is increased. The adsorption of the chelating resin on the heavy metals avoids the migration of the heavy metals to the soil, so as to affect the growth of rice. The water treatment agent provided by the present application not only realizes the purification of the water body and the soil, but also helps the growth of rice.

[0012] Preferably, the carrier is foamed nickel.

[0013] The foamed nickel can be magnetically attracted and is not prone to rust. The porous structure provides a large area of loading place for the bacterial body.

[0014] Preferably, the foamed nickel is carbon-coated by vapor deposition.

[0015] The foamed nickel has good alkali resistance, but the acid resistance is weak. After the water treatment agent is recovered, the regeneration process of the chelating resin will experience acid washing and alkali washing in sequence. The carbon-coating operation can make the nickel have good acid resistance, so as to protect the nickel from being worn out during the regeneration of the chelating resin.

[0016] A preparation method of the water treatment agent, comprising:

[0017] S1: under the protection of nitrogen, the sodium hydrosulfite and the alkaline salt are dissolved in distilled oxygen-free water to obtain a salt solution, and then the carrier is soaked in the salt solution to obtain a precursor; after the precursor is dried at a low temperature, the carrier with the sodium hydrosulfite and the alkaline salt attached to the surface is obtained;

[0018] S2: coating the carrier with anaerobic biofilm and aerobic biofilm in sequence to obtain a preform;

[0019] S3: placing the preform in the shell.

[0020] Sodium hydrosulfite is easy to decompose under heat, so low-temperature drying technology is adopted. The present application coats the carrier with anaerobic biofilm and aerobic biofilm in sequence, so that the organic matter in water is degraded by aerobic bacteria first and then by anaerobic bacteria. Meanwhile, the aerobic bacteria and sodium hydrosulfite are used in combination to provide a good anoxic environment for the anaerobic bacteria.

[0021] Preferably, S2 is specifically: the bacteria include aerobic bacteria and anaerobic bacteria; the aerobic bacteria and the anaerobic bacteria are separately cultured in culture medium, and then aerobic mycelium and anaerobic mycelium are obtained; the aerobic mycelium is placed in nutrient solution to obtain aerobic bacteria suspension; the anaerobic mycelium is placed in nutrient solution to obtain anaerobic bacteria suspension; the carrier is immersed in the anaerobic bacteria suspension, shaken and solidified, then immersed in the aerobic bacteria suspension, and finally taken out and dried at low temperature to obtain a preform.

[0022] Preferably, S3 is specifically: the chelating resin is coated on the preform with ice layer on the surface by coating technology, dried, and then laser drilling is adopted to make the chelating resin have through holes.

[0023] The ice layer evaporates during drying, and the structure that the preform is accommodated in the inner cavity of the chelating resin makes it easier for the water treatment agent as a whole to float with the carrier submerged in water. The chelating resin itself is a porous structure, and water vapor can pass through, but the pore size is small, and the surface tension of liquid water makes it difficult to enter the chelating resin and contact with microorganisms, so laser drilling is needed to provide a water passage.

[0024] Preferably, the low-temperature drying process of S1 is carried out in a vacuum environment.

[0025] Sodium hydrosulfite is easy to react with oxygen in the presence of water, so a vacuum environment is adopted.

[0026] A recovery device for recovering the water treatment agent, comprising a telescopic rod, an electromagnet and a double-cavity shell; the telescopic rod is connected to the outer wall of the double-cavity shell; the two inner cavities of the double-cavity shell are arranged along the length direction of the telescopic rod; the electromagnet is arranged in one cavity of the double-cavity shell away from the telescopic rod; the other cavity of the double-cavity shell is provided with a storage battery; the coil of the electromagnet is connected to the storage battery; the side of the double-cavity shell away from the telescopic rod is provided with an adsorption port; one side of the cavity of the double-cavity shell away from the telescopic rod in the width direction of the telescopic rod is provided with a release port; the winding main direction of the electromagnet is the same as the width direction of the telescopic rod.

[0027] The application of the water treatment agent is characterized in that the water treatment agent is used in shallow water area.

[0028] The sewage treatment in natural environment is different from the centralized treatment in factory, the factory can artificially increase the dissolved oxygen to improve the activity of aerobic bacteria, and can also artificially provide an anoxic environment to improve the activity of anaerobic bacteria, and the stirring device can also easily make the microorganisms uniformly dispersed in the water, but if the water layer is too deep in the natural environment, the dissolved oxygen at the bottom of the water is limited, and the water treatment agent is also difficult to uniformly disperse. After the shallow water area such as farmland is applied with pesticides and the pesticide effect has been utilized, the water treatment agent provided by the application is added, at this time, the water layer in the water body is shallow, the content of organic pollutants and heavy metals has not been diluted, and the water treatment agent is applied at the source, so that the purification effect is better. Since the water layer is shallow, the application volume of the water treatment agent is reduced, and the application environment is the growth environment of rice, and there is no need to additionally provide nutrients for microorganisms.

[0029] The application has at least the following beneficial effects:

[0030] The application changes the conventional sewage treatment idea, and starts from the pollution source, applies before the pesticide migrates with the water body, effectively avoids the spread of the pollution source, especially the spread to the soil and groundwater. Meanwhile, the volume of the treated water is reduced, and the application amount of the water treatment agent is reduced;

[0031] The water treatment agent provided by the application can be recycled, due to this characteristic, the preparation cost of the water treatment agent is lower, and the water treatment agent does not need to be naturally degraded after being applied to the natural environment; the combination of aerobic bacteria and anaerobic bacteria improves the purification effect of the water treatment agent; the existence of the alkaline salt makes the heavy metal adsorption and microbial degradation complementary, and they do not restrict each other;

[0032] The chelating resin and the carrier are two separate individuals, the adsorption effect of the chelating adsorbent is not affected by the carrier, and through the cooperation of the chelating resin and the carrier, the water treatment agent has specific structural characteristics, the microorganisms in the carrier can fully contact the water body, at the same time, the water treatment agent cannot sink into the bottom of the water to contact the sludge, and is difficult to be magnetically separated, in addition, the recycling device is easy to be damaged or have electric leakage when extending into the water. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the application, and therefore should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0034] Figure 1 Part of the cross-sectional view of the recycling device provided by the application;

[0035] Icon: 1- telescopic rod, 2- electromagnet, 3- double cavity shell, 31- adsorption port, 32- release port, 4- battery. DETAILED DESCRIPTION

[0036] For the purpose of making the object, method scheme and advantages of the embodiments of the present application more clear, the method scheme in the embodiments of the present application is described clearly and completely, obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0037] Embodiment 1:

[0038] A preparation method of the water treatment agent, comprising:

[0039] S1: under the protection of nitrogen, 4 parts of sodium dithionite and 10 parts of sodium carbonate are dissolved in 50 parts of distilled oxygen-free water to obtain a salt solution, then a square foam nickel with a side length of 5 mm after carbon coating is added to the salt solution and soaked for 8 hours to obtain a precursor, and the carbon layer is 1 nm thick; the precursor is dried at low temperature under vacuum to obtain a carrier with sodium dithionite and sodium carbonate attached to the surface;

[0040] S2: the bacteria include aerobic bacteria: nitrifying bacteria and denitrifying bacteria, anaerobic bacteria: hydrolytic fermentation bacteria, hydrogen-producing and acetic acid-producing bacteria, and methanogenic bacteria; the aerobic bacteria and the anaerobic bacteria are separately cultured in a culture medium, and then aerobic bacterial filaments and anaerobic bacterial filaments are taken; the aerobic bacterial filaments are placed in a nutrient solution to obtain an aerobic bacterial suspension; the anaerobic bacterial filaments are placed in a nutrient solution to obtain an anaerobic bacterial suspension; the carrier is immersed in the anaerobic bacterial suspension for 60 minutes, and then shaken and solidified, and then the carrier is immersed in the aerobic bacterial suspension for 45 minutes, and finally taken out and dried at low temperature to obtain a preform;

[0041] S3: the preform with ice layer on the surface is coated with the chelating resin by coating technology, dried, and then laser drilling technology is used to make the chelating resin have through holes, the ice layer is 3 mm thick, and the shell is 3 mm thick.

[0042] Experimental Example 1:

[0043] A preparation method of the water treatment agent, comprising:

[0044] S1: under the protection of nitrogen, 4 parts of sodium dithionite are dissolved in 50 parts of distilled oxygen-free water to obtain a salt solution, then a square foam nickel with a side length of 5 mm after carbon coating is added to the salt solution and soaked for 8 hours to obtain a precursor, and the carbon layer is 1 nm thick; the precursor is dried at low temperature under vacuum to obtain a carrier with sodium dithionite attached to the surface;

[0045] S2: the bacteria include aerobic bacteria: nitrifying bacteria and denitrifying bacteria, anaerobic bacteria: hydrolytic fermentation bacteria, hydrogen-producing and acetic acid-producing bacteria, and methanogenic bacteria; the aerobic bacteria and the anaerobic bacteria are respectively cultured in a culture medium, and then aerobic bacterial filaments and anaerobic bacterial filaments are obtained; the aerobic bacterial filaments are placed in a nutrient solution to obtain an aerobic bacterial suspension; the anaerobic bacterial filaments are placed in a nutrient solution to obtain an anaerobic bacterial suspension; the carrier is immersed in the anaerobic bacterial suspension for 60 minutes, and then is oscillated and solidified, and then the carrier is immersed in the aerobic bacterial suspension for 45 minutes, and finally the carrier is taken out and dried at low temperature to obtain a preform;

[0046] S3: the preform is coated with the chelating resin by coating technology, and then is dried, and then a through hole is formed in the chelating resin by laser drilling technology, and the ice layer has a thickness of 3 mm and the shell has a thickness of 3 mm.

[0047] Experimental Example 2

[0048] A preparation method of the water treatment agent includes the following steps:

[0049] S1: under the protection of nitrogen, 4 parts of sodium hydrosulfite and 10 parts of sodium carbonate are dissolved in 50 parts of distilled oxygen-free water to obtain a salt solution, and then a square foam nickel with a side length of 5 mm after carbon coating is immersed in the salt solution for 8 hours to obtain a precursor, and the carbon layer has a thickness of 1 nm; the precursor is dried at low temperature in vacuum to obtain a carrier with sodium hydrosulfite and sodium carbonate on the surface;

[0050] S2: the bacteria include aerobic bacteria: nitrifying bacteria and denitrifying bacteria, anaerobic bacteria: hydrolytic fermentation bacteria, hydrogen-producing and acetic acid-producing bacteria, and methanogenic bacteria; the aerobic bacteria and the anaerobic bacteria are respectively cultured in a culture medium, and then aerobic bacterial filaments and anaerobic bacterial filaments are obtained; the aerobic bacterial filaments are placed in a nutrient solution to obtain an aerobic bacterial suspension; the anaerobic bacterial filaments are placed in a nutrient solution to obtain an anaerobic bacterial suspension; the carrier is immersed in the anaerobic bacterial suspension for 60 minutes, and then is oscillated and solidified, and then the carrier is immersed in the aerobic bacterial suspension for 45 minutes, and finally the carrier is taken out and dried at low temperature to obtain a preform;

[0051] S3: the preform is coated with the chelating resin by coating technology, and then is dried, and then a through hole is formed in the chelating resin by laser drilling technology, and the shell has a thickness of 3 mm.

[0052] Experimental Example 3

[0053] A preparation method of the water treatment agent includes the following steps:

[0054] S1: under nitrogen protection, 10 parts of sodium carbonate is dissolved in 50 parts of distilled oxygen-free water to obtain a salt solution, then a square foam nickel with a side length of 5 mm after carbon coating is added to the salt solution for 8 hours of soaking to obtain a precursor, and the carbon layer is 1 nm thick; the precursor is dried at low temperature under vacuum to obtain a carrier with sodium dithionite and sodium carbonate attached to the surface;

[0055] S2: the bacteria include aerobic bacteria: nitrifying bacteria and denitrifying bacteria, anaerobic bacteria: hydrolytic fermentation bacteria, hydrogen-producing and acetic acid-producing bacteria, and methanogenic bacteria; the aerobic bacteria and the anaerobic bacteria are separately cultured in a culture medium, and then aerobic bacterial filaments and anaerobic bacterial filaments are obtained; the aerobic bacterial filaments are placed in a nutrient solution to obtain an aerobic bacterial suspension; the anaerobic bacterial filaments are placed in a nutrient solution to obtain an anaerobic bacterial suspension; the carrier is immersed in the anaerobic bacterial suspension for 60 minutes, and then is shaken and solidified, and then the carrier is immersed in the aerobic bacterial suspension for 45 minutes, and finally is taken out and dried at low temperature to obtain a preform;

[0056] S3: the preform with the ice layer on the surface is coated with the chelating resin by coating technology, dried, and then a through hole is formed in the chelating resin by laser drilling technology, and the ice layer is 3 mm thick and the shell is 3 mm thick.

[0057] The farmland water and sludge after 5 days of drug administration are divided into 5 parts and placed in containers, and the water layer height is consistent with the farmland water height. The water treatment agent prepared according to the preparation method of Example 1 and Experimental Examples 1-3 is used for purification of 4 parts of farmland water, and the last part is used as a blank example. After 1 day of applying the water treatment agent, the content of pollutants in the farmland water is detected and the removal rate is calculated, and the results are shown in Table 1.

[0058] Table 1

[0059] COD BOD cadmium ions copper ions zinc ions Example 1 96.03% 93.85% 94.47% 92.70% 95.18% Experimental Example 1 57.82% 49.37% 53.29% 45.16% 50.01% Experimental Example 2 75.66% 68.95% 82.54% 79.83% 86.91% Experimental Example 3 67.54% 60.92% 92.27% 93.53% 94.77%

[0060] From the above Experimental Example 1, it can be seen that when the carrier is not loaded with sodium carbonate, the organic acid metabolized by the microorganisms seriously affects the removal rate of heavy metals by the chelating resin, and the residual heavy metals also affect the degradation of organic matter by the microorganisms. From Experimental Example 2, it can be seen that when the structure of the water treatment agent is changed, the inner wall of the chelating resin is covered, reducing the adsorption area of the chelating resin for heavy metals, resulting in a decrease in the removal rate of heavy metals, and when the water treatment agent floats on the water surface, the carrier is difficult to completely immerse in the water, which also affects the purification effect of the bacteria on the water body. From Experimental Example 3, it can be seen that when the aerobic bacteria only provide an anoxic environment for the anaerobic bacteria without being combined with sodium dithionite, the activity of the anaerobic bacteria decreases, and the degradation rate of organic matter decreases.

[0061] A recovery device for recovering water treatment agent, comprising a telescopic rod 1, an electromagnet 2 and a double-cavity housing 3; the telescopic rod 1 is connected to the outer wall of the double-cavity housing 3; the two inner cavities of the double-cavity housing 3 are arranged along the length direction of the telescopic rod 1; the electromagnet 2 is arranged in one cavity of the double-cavity housing 3 away from the telescopic rod 1; the other cavity of the double-cavity housing 3 is provided with a storage battery 4; the coil of the electromagnet 2 is connected to the storage battery 4; one side of the double-cavity housing 3 away from the telescopic rod 1 is provided with an adsorption port 31; one side of the cavity of the double-cavity housing 3 away from the telescopic rod 1 is provided with a release port 32 in the width direction of the telescopic rod 1; the winding main direction of the electromagnet 2 is the same as the width direction of the telescopic rod 1.

[0062] In the implementation process, a container for placing water treatment agent can be prepared, such as a plastic bottle. Figure 1 As shown in the figure, when the electromagnet 2 is connected to the storage battery 4, the water treatment agent is adsorbed, then the electromagnet 2 is placed above the container, the power is turned off, the water treatment agent is separated from the electromagnet 2 and falls into the container.

[0063] The above is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for preparing a water treatment agent, characterized in that, The water treatment agent comprises: bacterial cells, a carrier, and a shell; the bacterial cells are loaded on the carrier; the carrier is located inside the shell; the shell has through holes; the surface of the carrier is further coated with sodium dithionite and an alkaline salt; the shell is a chelating resin; the carrier includes a magnetically adsorbable metal. The density of the water treatment agent is less than or equal to that of water; the density of the shell is less than that of water; the density of the carrier is greater than that of water. The preparation method includes: S1: Under nitrogen protection, the sodium dithionite and the alkaline salt are dissolved in distilled deoxygenated water to obtain a salt solution. Then, the carrier is added to the salt solution and soaked to obtain a precursor. The precursor is dried at low temperature to obtain a carrier with sodium dithionite and the alkaline salt on its surface. S2: The carrier is sequentially coated with an anaerobic biofilm and an aerobic biofilm to obtain a preform; S3: Place the preform inside the housing; S3 specifically involves coating the preform with an ice layer on its surface using a coating technique, drying it, and then using laser drilling technology to create through-pores in the chelating resin.

2. The preparation method according to claim 1, characterized in that, The carrier is nickel foam.

3. The preparation method according to claim 2, characterized in that, The nickel foam is coated with carbon via vapor deposition.

4. The method for preparing the water treatment agent according to claim 1, characterized in that, S2 specifically involves: the bacterial cells comprising aerobic and anaerobic bacteria; after expanding the aerobic and anaerobic bacteria in a culture medium, aerobic and anaerobic hyphae are taken; the aerobic hyphae are placed in a nutrient solution to obtain an aerobic bacterial suspension; the anaerobic hyphae are placed in a nutrient solution to obtain an anaerobic bacterial suspension; the carrier is immersed in the anaerobic bacterial suspension, shaken to solidify, and then the carrier is immersed in the aerobic bacterial suspension, and finally removed and dried at low temperature to obtain a preform.

5. The method for preparing the water treatment agent according to claim 4, characterized in that, The S1 low-temperature drying process is carried out in a vacuum environment.

6. The application of a water treatment agent prepared by the method of any one of claims 1-5, characterized in that, The water treatment agent is used in shallow water areas.

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