Water treatment preparation and preparation method thereof

Abstract

The invention provides a water treatment preparation and a preparation method thereof, and relates to the field of sewage treatment. The preparation method comprises the following steps: uniformly mixing a liquid culture medium and nano activated carbon, adding a gelatin aqueous solution, and carrying out ultrasonic oscillation treatment and drying to obtain a porous carrier; uniformly mixing the microbial agent and the liquid culture medium, adding the mesoporous calcium carbonate and the porous carrier, and uniformly mixing to obtain a suspension; mixing polyvinyl alcohol, agar and water, heating to 80-90 DEG C, uniformly stirring, cooling to 40-50 DEG C, adding the suspension, and uniformly stirring; cooling to 30-35 DEG C, adding alum powder, uniformly stirring, cooling and crushing to obtain particles; the preparation method comprises the following steps: uniformly mixing chitosan and an acetic acid solution, adding an alcoholic solution of glutaraldehyde and beta-cyclodextrin, stirring at 40-50 DEG C for 30-40 minutes, coating the surface of the particulate matter with the mixture, and drying. The water treatment preparation can slowly provide nutrient substances for the microbial agent through multi-layer coating, so that the effective time of the preparation for treating sewage is prolonged.

Description

Technical Field

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

[0002] Microbial treatment of sewage is currently the most energy-saving and effective treatment method. It improves water quality through the metabolic activities of microorganisms, can degrade organic matter, transform harmful substances, increase dissolved oxygen in water, etc., so as to achieve the purpose of purifying water quality. Microbial treatment of sewage has the following advantages: No toxic side effects: Microbial preparations come from nature and have no pathogenic harm to humans and breeding objects. No residue: No harmful substances will be left in the water after use. No drug resistance: Unlike chemical drugs, microbial preparations will not make pathogens resistant. Environmentally friendly: It can maintain the balance of aquatic ecosystems and reduce pollution to the environment.

[0003] Among them, immobilized microbial technology is a microbial treatment technology that can be used to treat sewage and can efficiently remove organic matter, nitrogen, phosphorus and other pollutants in sewage. By using physical adsorption, chemical reaction fixation, porous carrier embedding, self-crosslinking fixation and other methods, enzymes, microbial cells, animal and plant cells, organelles, etc. are restricted or positioned in a specific spatial area, and their activity is maintained and sewage can be treated continuously. Compared with the direct input of microbial agents, this method has a higher treatment efficiency.

[0004] At present, the immobilized microbial technology mostly uses polyvinyl alcohol, sodium alginate, etc. to embed and fix the microbial agents. The strength of polyvinyl alcohol and sodium alginate after embedding is insufficient, and with the growth of microorganisms, the breakage rate of the embedded body is high, causing the internal microorganisms to lose their fixation effect, thereby reducing the efficiency of sewage treatment. Summary of the invention

[0005] The purpose of the present invention is to provide a water treatment preparation which, through multi-layer coating, can slowly provide nutrients to microbial agents, prolong the existence time of microorganisms in the preparation, and increase the number of microorganisms; through microbial metabolic activities, it can continuously degrade harmful substances in sewage and prolong the effective time of the preparation for treating sewage.

[0006] Another object of the present invention is to provide a method for preparing a water treatment preparation, wherein the culture medium is adsorbed into the pores of mesoporous calcium carbonate and then coated multiple times, thereby effectively extending the time for the preparation to treat sewage.

[0007] The present invention solves the technical problem by adopting the following technical solutions.

[0008] In one aspect, an embodiment of the present invention provides a method for preparing a water treatment formulation, comprising the following steps:

[0009] S1, mixing the liquid culture medium and the nano-activated carbon uniformly, adding a gelatin aqueous solution, ultrasonically shaking, and drying to obtain a porous carrier;

[0010] S2, mixing the microbial agent and the liquid culture medium evenly, and then adding the mesoporous calcium carbonate and the porous carrier of step S1, mixing evenly to obtain a suspension;

[0011] S3, mixing polyvinyl alcohol, agar and water, heating to 80-90°C and stirring evenly, cooling to 40-50°C, adding the suspension of step S2, stirring evenly; cooling to 30-35°C, adding alum powder, stirring evenly, cooling until the agar solidifies, and crushing to obtain granules;

[0012] S4, mixing chitosan and acetic acid solution evenly, adding glutaraldehyde alcohol solution and β-cyclodextrin, stirring at 40-50° C. for 30-40 minutes, coating the mixture on the surface of the particles in step S3, and drying to obtain the water treatment preparation.

[0013] In some embodiments of the present invention, the particle size of the mesoporous calcium carbonate is 0.5-1 mm, the average pore size is 100-200 um, and the particle size of the nano-activated carbon is 80-100 nm.

[0014] In some embodiments of the present invention, the power of the ultrasonic oscillation is 50-80KHz, and the treatment time is 10-30min. Through high-frequency ultrasonic oscillation, the activated carbon and liquid culture medium molecules obtain a certain amount of energy, which facilitates the liquid culture medium molecules to enter the pores of the activated carbon and be loaded in the pores. Under the action of ultrasonic oscillation, the loading effect is better.

[0015] In some embodiments of the present invention, the mass fraction of the gelatin aqueous solution is 5-10%. After drying, the low-concentration gelatin aqueous solution can form a local film on the activated carbon, that is, it forms a wrapping or semi-wrapping state on the surface and pores of the activated carbon, and wraps the effective ingredients of the culture medium in the pores of the activated carbon; when using the water treatment preparation of the present invention, the film formed by the gelatin swells and decomposes in water, and the culture medium components in the activated carbon can be released, continuing to provide the microorganisms with the nutrients required for growth; secondly, the released activated carbon can also adsorb microorganisms in the water, providing a carrier for the growth of microorganisms.

[0016] In some embodiments of the present invention, the microbial agent includes a mixture of one or more of ammonia nitrogen degrading bacteria, COD degrading bacteria, and phosphorus removal bacteria.

[0017] Ammonia nitrogen degrading bacteria can efficiently degrade ammonia nitrogen in sewage, including: Pseudomonas sp., Alcaligenes faecalis, Bacillus sp., Acinetobacter sp., Rhodococcus sp., Paracoccus, Ochrobactrum sp., Providencia and other bacterial microorganisms, as well as yeast, Fusarium, Penicillium and other fungal microorganisms. The corresponding microorganisms can be selected according to the actual situation. COD (chemical oxygen demand) degrading bacteria are mainly used to degrade COD in wastewater, improve water quality color, increase sludge floc particles, adjust sludge floc structure, and inhibit algae growth. There are mainly calcium acetate Acinetobacter, Bacillus, nitrifying bacteria, denitrifying bacteria, Pseudomonas, yeast, etc. Phosphorus removal bacteria is a type of bacteria that removes phosphorus content in water through biological metabolism. Such as Lampropedia spp., Microlunatus phosphovorus, Clostridium pasteurianum, Butyric acid Bacterium, Pseudomonas spp., etc.

[0018] In some embodiments of the present invention, the mass ratio of polyvinyl alcohol, agar and water is (5-10): (1-5): (10-20). The addition of polyvinyl alcohol and agar can embed microorganisms and porous carriers, and the mesoporous calcium carbonate inside can improve the mechanical strength of the particles.

[0019] In some embodiments of the present invention, the mass ratio of the alum to the microbial agent is 1:(1-2).

[0020] In some embodiments of the present invention, in step S4, it further includes adding activated carbon powder after stirring at 40-50° C. and stirring evenly. The activated carbon is loaded on the surface, and the adsorption effect of the activated carbon is used to preliminarily adsorb the suspended matter in the water body, providing a good environment for the subsequent growth of microorganisms.

[0021] In some embodiments of the present invention, the mass ratio of the activated carbon powder to the particulate matter is 0.1-0.5:1.

[0022] On the other hand, an embodiment of the present invention provides a water treatment preparation prepared by the above method.

[0023] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0024] The water treatment preparation preparation method provided by the present invention comprises the following steps: firstly mixing a liquid culture medium with nano activated carbon, and under the action of ultrasonic vibration, the liquid culture medium can be loaded on the surface and pores of the nano activated carbon, and during the drying process, gelatin can form a coating film on the surface of the nano activated carbon to wrap the effective components of the culture medium inside; then the activated carbon, microbial agent and culture medium are loaded in the pores of mesoporous calcium carbonate, and the mesoporous calcium carbonate is used as a carrier, which has high mechanical strength; then the coating effect of polyvinyl alcohol and agar is utilized to coat the microbial agent and culture medium on the surface of the porous carrier to form a double-layer core structure, and when the agar is semi-solidified, alum powder is added to be loaded between the agar and the polyethanol, and then a layer of chitosan polymer is coated on the surface to protect the microbial agent inside. When the sewage treatment preparation of the present invention is used, the water treatment preparation is put into sewage, and the chitosan, cyclodextrin, agar, polyethanol, etc. coated on the outside of the microbial agent slowly dissolve, releasing the microbial agent to degrade pollutants in the water; secondly, alum is hydrolyzed into colloidal substances in water, which can adsorb pollutants in sewage, and at the same time, the adsorption effect of the colloid can be used to gather pollutants around the water treatment preparation, which is convenient for microbial metabolism and degradation. Thirdly, gelatin slowly swells in water, releasing the culture medium in the porous calcium carbonate, further providing nutrients for the microbial agent, so as to prolong the activity of the microbial agent and prolong the effective time of sewage treatment. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased commercially.

[0026] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to specific embodiments.

[0027] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0028] Example 1

[0029] The water treatment preparation of this embodiment was prepared as follows:

[0030] S1, mix the liquid culture medium and nano-activated carbon (average particle size 100nm) evenly, add 5% gelatin aqueous solution by mass, perform ultrasonic oscillation treatment at an ultrasonic frequency of 50KHz for 30min, and dry to obtain a porous carrier; wherein the ratio of liquid culture medium, nano-activated carbon, and gelatin aqueous solution is 1ml:1g:1ml.

[0031] S2, ammonia nitrogen degrading bacteria (Bacillus, 8.0×10 9 cfu / ml), COD-degrading bacteria (nitrifying bacteria, 5.0×10 9 cfu / ml), phosphate-removing bacteria (Pseudomonas, 5.0×10 9 cfu / ml) and the liquid culture medium are evenly mixed, and then mesoporous calcium carbonate (average particle size 0.8 mm, average pore size 100 um) and the porous carrier of step S1 are added and mixed evenly to obtain a suspension; wherein the mass ratio of the microbial agent, the mesoporous calcium carbonate, and the porous carrier is 1:2:1.

[0032] S3, mixing polyvinyl alcohol, agar and water, heating to 85°C and stirring evenly, cooling to 50°C, adding the suspension of step S2, stirring evenly; cooling to 35°C until the agar is in a semi-solidified state, adding alum powder, stirring evenly, cooling until the agar solidifies, and crushing to an average particle size of 2 cm to obtain granules;

[0033] Among them, the mass ratio of polyvinyl alcohol, agar and water is 10:5:10, the mass ratio of microbial agent to agar in the suspension is 1:1; the mass ratio of alum to microbial agent is 1:1.

[0034] S4, chitosan and 10% acetic acid solution are mixed evenly in a mass volume ratio of 1:2, and then an alcohol solution of glutaraldehyde (10wt%) with an equal volume to the acetic acid and an equal mass of β-cyclodextrin with chitosan are added, and after stirring at 50°C for 30 minutes, the mixture is coated on the surface of the particles in step S3 by a sprayer, and dried under natural ventilation at room temperature to obtain the water treatment preparation.

[0035] Example 2

[0036] The water treatment preparation of this embodiment was prepared as follows:

[0037] S1, mix the liquid culture medium and nano-activated carbon (average particle size 100nm) evenly, add 5% gelatin aqueous solution by mass, perform ultrasonic oscillation treatment at an ultrasonic frequency of 80KHz for 30min, and dry to obtain a porous carrier; wherein the ratio of liquid culture medium, nano-activated carbon, and gelatin aqueous solution is 1ml:1g:1ml.

[0038] S2, ammonia nitrogen degrading bacteria (Bacillus, 8.0×10 9 cfu / ml), COD-degrading bacteria (nitrifying bacteria, 5.0×10 9 cfu / ml), phosphate-removing bacteria (Pseudomonas, 5.0×10 9cfu / ml) and the liquid culture medium are evenly mixed, and then mesoporous calcium carbonate (average particle size 0.8 mm, average pore size 100 um) and the porous carrier of step S1 are added and mixed evenly to obtain a suspension; wherein the mass ratio of the microbial agent, the mesoporous calcium carbonate, and the porous carrier is 1:3:1.

[0039] S3, mixing polyvinyl alcohol, agar and water, heating to 85°C and stirring evenly, cooling to 50°C, adding the suspension of step S2, stirring evenly; cooling to 35°C until the agar is in a semi-solidified state, adding alum powder, stirring evenly, cooling until the agar solidifies, and crushing to an average particle size of 2 cm to obtain granules;

[0040] Among them, the mass ratio of polyvinyl alcohol, agar and water is 10:3:10, the mass ratio of microbial agent to agar in the suspension is 1:1; the mass ratio of alum to microbial agent is 1:1.5.

[0041] S4, chitosan and 10% acetic acid solution are mixed evenly in a mass volume ratio of 1:2, and then an alcohol solution of glutaraldehyde (10wt%) with an equal volume to the acetic acid and an equal mass of β-cyclodextrin with chitosan are added, and after stirring at 50°C for 30 minutes, the mixture is coated on the surface of the particles in step S3 by a sprayer, and dried under natural ventilation at room temperature to obtain the water treatment preparation.

[0042] Example 3

[0043] The water treatment preparation of this embodiment was prepared as follows:

[0044] S1, mix the liquid culture medium and nano-activated carbon (average particle size 80nm) evenly, add 5% gelatin aqueous solution by mass, perform ultrasonic oscillation treatment at an ultrasonic frequency of 80KHz for 10min, and dry to obtain a porous carrier; wherein the ratio of liquid culture medium, nano-activated carbon, and gelatin aqueous solution is 1ml:1g:1ml.

[0045] S2, mix the microbial agent mixed with ammonia nitrogen degrading bacteria (Bacillus, 8.0×109cfu / ml), COD degrading bacteria (nitrifying bacteria, 5.0×109cfu / ml), and phosphorus removal bacteria (Pseudomonas, 5.0×109cfu / ml) and liquid culture medium, then add mesoporous calcium carbonate (average particle size 0.8mm, average pore size 100um) and the porous carrier of step S1, mix evenly to obtain a suspension; wherein the mass ratio of the microbial agent, mesoporous calcium carbonate, and porous carrier is 1:3:2.

[0046] S3, mixing polyvinyl alcohol, agar and water, heating to 90°C and stirring evenly, cooling to 50°C, adding the suspension of step S2, stirring evenly; cooling to 35°C until the agar is in a semi-solidified state, adding alum powder, stirring evenly, cooling until the agar solidifies, and crushing to an average particle size of 2 cm to obtain granules;

[0047] Among them, the mass ratio of polyvinyl alcohol, agar and water is 5:5:10, the mass ratio of microbial agent to agar in the suspension is 1:1; the mass ratio of alum to microbial agent is 1:1.5.

[0048] S4, chitosan and 10% acetic acid solution are mixed evenly in a mass volume ratio of 1:2, and then an alcohol solution of glutaraldehyde (10wt%) with an equal volume to the acetic acid and an equal mass of β-cyclodextrin with chitosan are added, and after stirring at 40°C for 30 minutes, the mixture is coated on the surface of the particles in step S3 by a sprayer, and dried under natural ventilation at room temperature to obtain the water treatment preparation.

[0049] Example 4

[0050] The difference from Example 1 is that in step S4, after stirring at 50°C for 30 minutes, activated carbon powder (average particle size 200 nm) is added to the system, stirred evenly, and then the mixed solution is coated on the surface of the particles in step S3 by a sprayer, and dried under natural ventilation at room temperature to obtain the water treatment preparation. The mass ratio of activated carbon powder to the particles in step S3 is 0.5:1.

[0051] Example 5

[0052] The difference from Example 4 is that in step S4, the mass ratio of the activated carbon powder added to the particulate matter in step S3 is 0.1:1.

[0053] Comparative Example 1

[0054] The difference from Example 1 is that in step S1, no gelatin aqueous solution is added, and the remaining steps and raw materials are the same as those of Example 1.

[0055] Comparative Example 2

[0056] The difference from Example 1 is that in step S2, mesoporous calcium carbonate is not added, and the remaining steps and raw materials are the same as those of Example 1.

[0057] Comparative Example 3

[0058] The difference from Example 1 is that in step S3, alum powder is not added, and the remaining steps and raw materials are the same as those of Example 1.

[0059] Comparative Example 4

[0060] The difference from Example 1 is that in step S2, β-cyclodextrin is not added, and the remaining steps and raw materials are the same as those of Example 1.

[0061] Effect example

[0062] The water treatment preparations prepared in Examples 1-5 and Comparative Examples 1-4 were used as research objects, and the sewage from a certain town was used as the sewage to be treated, and the following tests were carried out.

[0063] 1. The water treatment preparations of Examples 1-5 and Comparative Examples 1-4 were respectively put into 500m 3 In the sewage meter, the input amount is 0.5Kg / m 3 After the water treatment agent was added, air was pumped into the sewage at a rate of 50 L / h. After 48 hours of treatment, the nitrate nitrogen and COD values ​​in the sewage were tested. The results are shown in Table 1.

[0064] Table 1 Test results before and after treatment

[0065]

[0066]

[0067] It can be concluded from Table 1 that the sewage treatment capacity of the water treatment preparations of Examples 1-5 is significantly better than that of the water treatment preparations of Comparative Examples 1-4. In Comparative Example 1, no gelatin solution was added, and within 48 hours, the activity of the microorganisms was less affected, and the sewage treatment capacity was not much different from that of Examples 1-5. In Example 2, no mesoporous calcium carbonate was added. When the treatment agent was put into the water, as agar and polyvinyl alcohol decomposed, the microbial inoculants, culture medium, etc. were separated, the reproduction rate of the microorganisms was slow, the metabolic activity of the microorganisms was slow, and the sewage treatment capacity was also worse than that of Examples 1-5.

[0068] In summary, the water treatment preparation provided by the embodiment of the present invention uses mesoporous calcium carbonate as a carrier, and its mechanical strength is high; the coating effect of polyvinyl alcohol and agar is then used to coat the microbial agent and culture medium on the surface of the porous carrier to form a double-layer core structure, and when the agar is semi-solidified, alum powder is added and loaded between agar and polyethanol, and then a layer of chitosan polymer is coated on the surface to protect the microbial agent inside. When using the sewage treatment preparation of the present invention, the water treatment preparation is put into the sewage, and the chitosan, cyclodextrin, agar, polyethanol, etc. coated on the outside of the microbial agent are slowly dissolved to release the microbial agent to degrade the pollutants in the water; secondly, alum is hydrolyzed into colloidal substances in water, which can adsorb pollutants in sewage, and the adsorption effect of colloids can also be used to gather pollutants around the water treatment preparation, which is convenient for microbial metabolism and degradation. On the third aspect, gelatin slowly swells in water, releasing the culture medium in porous calcium carbonate, further providing nutrients for the microbial agent to prolong the activity of the microbial agent and prolong the effective time of sewage treatment.

[0069] The embodiments described above are part of the embodiments of the present invention, rather than all of the embodiments. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

Claims

1. A method for preparing a water treatment agent, characterized in that: The following steps are involved: S1, mixing the liquid culture medium and the nano-activated carbon uniformly, adding a gelatin aqueous solution, ultrasonically shaking, and drying to obtain a porous carrier; S2, mixing the microbial agent and the liquid culture medium evenly, and then adding the mesoporous calcium carbonate and the porous carrier of step S1, mixing evenly to obtain a suspension; S3, mixing polyvinyl alcohol, agar and water, heating to 80-90°C and stirring evenly, cooling to 40-50°C, adding the suspension of step S2, stirring evenly; cooling to 30-35°C, adding alum powder, stirring evenly, cooling until the agar solidifies, and crushing to obtain granules; S4, mixing chitosan and acetic acid solution evenly, adding glutaraldehyde alcohol solution and β-cyclodextrin, stirring at 40-50° C. for 30-40 minutes, coating the mixture on the surface of the particles in step S3, and drying to obtain the water treatment preparation.

2. The method for preparing a water treatment agent according to claim 1, characterized in that: The particle size of the mesoporous calcium carbonate is 0.5-1 mm, and the average pore size is 100-200 um.

3. The method for preparing a water treatment agent according to claim 1, characterized in that: The power of the ultrasonic oscillation is 50-80KHz, and the treatment time is 10-30min.

4. The method for preparing a water treatment agent according to claim 1, characterized in that: The mass fraction of the gelatin aqueous solution is 5-10%.

5. The method for preparing a water treatment agent according to claim 1, characterized in that: The microbial agent includes a mixture of one or more of ammonia nitrogen degrading bacteria, COD degrading bacteria and phosphorus removal bacteria.

6. The method for preparing a water treatment agent according to claim 1, characterized in that: The mass ratio of the polyvinyl alcohol, agar and water is (5-10):(1-5):(10-20).

7. The method for preparing a water treatment agent according to claim 1, characterized in that: The mass ratio of the alum to the microbial agent is 1:(1-2).

8. The method for preparing a water treatment agent according to claim 1, characterized in that: In the step S4, the process further includes adding activated carbon powder after stirring evenly at 40-50° C. and stirring evenly.

9. The method for preparing a water treatment agent according to claim 8, characterized in that: The mass ratio of the activated carbon powder to the particulate matter is 0.1-0.5:

1.

10. A water treatment preparation, characterized in that The invention is prepared by the preparation method according to any one of claims 1 to 9.

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