Immobilized microorganism-based water treatment agent, and preparation method and application thereof

Abstract

The application relates to the technical field of water treatment, and particularly discloses a water treatment agent based on immobilized microorganisms, a preparation method and application thereof. The water treatment agent comprises the following components in parts by weight: modified basalt microspheres 90-110 parts, water 200-250 parts, sodium alginate 4-10 parts, a microbial compound inoculant 10-15 parts, a nutrient agent 25-30 parts and a calcium agent 3-7 parts; the preparation method comprises the following steps: S1, uniformly mixing the modified basalt microspheres, the microbial compound inoculant, the nutrient agent and water in a formula amount to obtain a mixed solution I; preparing a saturated calcium solution with the calcium agent; uniformly mixing the sodium alginate and the mixed solution I to obtain a mixed solution II; S2, adding the saturated calcium solution into the mixed solution II, reacting, separating, drying to obtain the water treatment agent. The water treatment agent has the advantages of high strength, long service life and excellent water treatment effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water treatment, and more particularly to a water treatment agent based on immobilized microorganisms, and a preparation method and application thereof. BACKGROUND

[0002] The treatment agents, treatment methods and systems related to sewage treatment are important research directions in the water treatment industry all the time, and the key treatment indexes are heavy metals, ammonia nitrogen, nitrate nitrogen, total phosphorus, COD and BOD. When treating sewage, certain agents are often added to reduce the key indexes in the sewage, including flocculants, adsorbents and composite agents.

[0003] In related technologies, a water treatment material based on porous materials combined with microorganisms is prepared for water treatment. The specific preparation raw materials of the material are: microcrystalline wax, paraffin oil, foaming agent, glycerol, diatomite, microorganism, crude oil, nutrient substance and white carbon black; the microcrystalline wax is the main pore-forming material, the paraffin oil and the glycerol are the pore size adjusting agents, and the diatomite and the crude oil are compounded together to provide nutrients for the microorganisms; the preparation method is: the microcrystalline wax, the white carbon black, the diatomite, the paraffin oil, the foaming agent, the glycerol and the crude oil are heated and melted at 80℃, and then mixed uniformly and cooled, and then the nutrient substance and the microorganism are added and mixed uniformly to obtain the water treatment material after cooling. However, the material has the following problems: the high temperature in the reaction process has an impact on the activity of the microorganisms, so when the loaded microorganisms have poor high-temperature resistance, the material cannot be used; and the material is in block shape, has a small specific surface area, and has a relatively low treatment efficiency compared with the powder-like treatment agent.

[0004] There are also related technologies that only load microorganisms on existing porous materials, for example: a composite carrier is prepared by using biochar, sodium alginate and polyvinyl alcohol to load microorganisms, and then used for water treatment; for example: sodium alginate and polyvinyl alcohol are used as carriers to load microorganisms for water treatment; for example: modified ceramsite is used to load microorganisms to treat sewage; for example: porous silicon carbide and porous tourmaline ceramic material are used as carriers to load microorganisms to obtain a composite material for water treatment. However, the above materials have the following problems: due to the poor combination stability of the microorganisms and the carrier materials, the loading amount of the microorganisms on the carrier is not high, thereby affecting the water treatment effect, and the treatment effect of the microorganisms on ammonia nitrogen, nitrate nitrogen and total phosphorus in the sewage needs to be improved; in addition, the strength of the loaded material is not enough, which also affects the service life of the water treatment material. SUMMARY

[0005] In order to improve the water treatment effect and the strength of the composite water treatment agent, the present application provides a water treatment agent based on immobilized microorganisms, and a preparation method and application thereof.

[0006] The first aspect of the present application provides a water treatment agent based on immobilized microorganisms, which adopts the following technical scheme: a water treatment agent based on immobilized microorganisms, comprising the following components by weight: modified basalt microspheres 90-110 parts, water 200-250 parts, sodium alginate 4-10 parts, microbial complex inoculant 10-15 parts, nutrient agent 25-30 parts, and calcium agent 3-7 parts.

[0007] The modified basalt microspheres are obtained by treating basalt microspheres with an alkali solution and then loading sodium polyacrylate.

[0008] By adopting the above technical scheme, basalt microspheres are porous substances composed of inorganic matter, which have the advantage of being hard in texture. Selecting basalt microspheres as the carrier for loading microorganisms makes the obtained water treatment agent have high strength and long service life. However, basalt microspheres are composed of inorganic matter, so they have poor ability to load microorganisms. To solve this problem, the present application modifies basalt microspheres with sodium polyacrylate, which improves the hydrophilicity of basalt microspheres. Microorganisms are easily negatively charged in water, so basalt microspheres with improved hydrophilicity are easy to load microorganisms. In addition, the loaded microorganisms are further coated with sodium alginate, so that the microorganisms in the obtained water treatment agent can be more stably loaded on the basalt microspheres. In addition, the nutrient agent is also coated with the microorganisms, and due to the porous nature of basalt microspheres, the microorganisms entering the pores of basalt microspheres can also obtain nutrients in time, thereby having water treatment activity. The microorganisms present on the water treatment agent can continuously obtain nutrients in the later stage to survive, thereby continuously exerting the water treatment effect. The water treatment agent has the advantages of high efficiency in sewage treatment and high strength and long service life.

[0009] In the present application, the content of each microorganism in the microbial complex inoculant is (1-10) x 10 10 cfu / g.

[0010] Optionally, the modified basalt microspheres are prepared by a method comprising the following steps:

[0011] I. heating and mixing basalt microspheres and an alkali solution and reacting, and obtaining a basalt microsphere dispersion after cooling;

[0012] II. mixing the basalt microsphere dispersion and sodium polyacrylate at low temperature, and drying to obtain modified basalt microspheres; wherein the amount of sodium polyacrylate used is 15-25% of the weight of basalt microspheres.

[0013] By adopting the technical scheme, after the basalt microspheres are treated by the alkaline solution, the surface of the basalt microspheres is activated and has a larger roughness, so that the basalt microspheres are beneficial to stably loading the microorganisms and loading the sodium polyacrylate. The surface roughness of the basalt microspheres is larger, so that the specific surface area is larger, and the loading capacity of the microorganisms is larger, so that the water treatment agent has higher treatment efficiency and more remarkable effect when the water treatment agent is used for sewage treatment. The operation of heating and mixing makes the activation speed faster and the activation degree higher, and the surface roughness of the basalt microspheres is larger. The loading of the sodium polyacrylate at low temperature makes the basalt have excellent hydrophilicity, so that the loading of the microorganisms is more beneficial.

[0014] Optionally, the pH of the alkaline solution is 8-10; and the amount of the alkaline solution is 10-15% of the weight of the basalt microspheres.

[0015] By adopting the technical scheme, the alkaline solution with a proper pH is selected to control the surface roughness and the activation degree of the basalt microspheres, so that the obtained basalt microspheres have the ability to load the microorganisms and the internal pore diameter of the basalt microspheres is not excessively damaged. The internal pore diameter of the basalt microspheres provides space for the growth and reproduction of the microorganisms, so it is necessary to ensure the stability of the pore structure.

[0016] Optionally, the heating temperature in I is 45-65℃, and the reaction time is 20-40 min.

[0017] Optionally, the low temperature in II is 15-20℃, and the mixing time is 30-60 min.

[0018] Optionally, the microorganism complex inoculant contains at least one of ammonia nitrogen removal bacteria, nitrate nitrogen removal bacteria, phosphorus accumulating bacteria, and COD removal bacteria.

[0019] Optionally, the phosphorus accumulating bacteria are selected from at least one of Acinetobacter, Aerococcus, Corynebacterium, and Microcellula.

[0020] Optionally, the ammonia nitrogen removal bacteria are selected from at least one of photosynthetic bacteria, Bacillus, lactic acid bacteria, yeast, nitrosation bacteria, nitrification bacteria, and Vermine.

[0021] Optionally, the alkaline solution is selected from any one of sodium hydroxide solution, potassium hydroxide solution, and sodium carbonate solution.

[0022] Optionally, the nutrient agent includes a carbon source, a nitrogen source, trace elements, and auxiliary growth factors required for the growth of microorganisms; the particle size of the basalt microspheres is 50-150μm; and the calcium agent is selected as calcium chloride or calcium nitrate.

[0023] In a second aspect, the application provides a preparation method of the above-mentioned water treatment agent based on immobilized microorganisms, which adopts the following technical scheme:

[0024] The preparation method of the water treatment agent based on immobilized microorganisms comprises the following steps:

[0025] S1, uniformly mixing the modified basalt microspheres, the microbial complex microbial agent, the nutrient agent and the formula amount of water to obtain a mixed solution I;

[0026] Dissolving the calcium agent in water to obtain a saturated calcium solution;

[0027] Uniformly mixing the sodium alginate and the mixed solution I to obtain a mixed solution II;

[0028] S2, adding the saturated calcium solution to the mixed solution II, reacting, separating, drying the solid to obtain the water treatment agent.

[0029] By adopting the technical scheme, the microbial complex microbial agent, the nutrient agent and the modified basalt microspheres are first mixed, so that the microbial complex microbial agent and the nutrient agent first enter the internal apertures of the modified basalt microspheres and occupy the internal apertures and the surface thereof. Then the sodium alginate and the calcium agent are mixed, so that the sodium alginate is gelled, and the polyacrylic acid sodium in contact with the calcium agent is further gelled, so that the microorganisms are stably loaded on the basalt microspheres. It should be noted that before the modified basalt microspheres, the microbial complex microbial agent, the nutrient agent and the formula amount of water are uniformly mixed, the sodium alginate is not mixed, otherwise because the sodium alginate is sticky after being contacted with water, the sodium alginate is easy to first occupy the internal apertures and the surface of the modified basalt microspheres, so that the microorganisms are difficult to enter the internal apertures of the modified basalt microspheres, resulting in a decrease in the loading amount of the microorganisms on the modified basalt microspheres, and a poor sewage treatment effect of the prepared water treatment agent.

[0030] Optionally, the reaction time in S2 is 15-30 min.

[0031] In a third aspect, the present application provides a use of the water treatment agent based on immobilized microorganisms in sewage treatment.

[0032] Optionally, the ammonia nitrogen content in the sewage is 42.54-100.73 mg / L, the nitrate nitrogen content is 15.21-45.37 mg / L, the total phosphorus content is 8.23-18.64 mg / L, and the COD content is 500-1500 mg / L. Cr Optionally, the ammonia nitrogen content in the sewage is 42.54-100.73 mg / L, the nitrate nitrogen content is 15.21-45.37 mg / L, the total phosphorus content is 8.23-18.64 mg / L, and the COD content is 500-1500 mg / L.

[0033] Optionally, the use amount of the water treatment agent in the wastewater is 0.1-0.5 g / L.

[0034] In summary, the present application has the following beneficial effects:

[0035] 1. The modified basalt microspheres are used to load the microorganisms in the present application, so as to achieve excellent water treatment effect.

[0036] 2、The modified basalt microspheres in the application are activated on the surface by an alkali solution in preparation, which is beneficial to the stable grafting of sodium polyacrylate, so as to change the hydrophilicity of the basalt microspheres and be beneficial to the large and stable loading of microorganisms; in addition, the surface roughness of the basalt microspheres can be further improved after the alkali solution treatment, so as to provide more binding sites for the loading of microorganisms. Through the above comprehensive treatment of the basalt microspheres, the water treatment effect of the water treatment agent prepared by using the modified basalt microspheres is significantly improved.

[0037] 3、In the preparation of the water treatment agent of the application, first, the other raw materials except sodium alginate and calcium agent are mixed, so as to avoid the influence of the viscous state of sodium alginate after dissolving in water on the occupation of the internal pore diameter of the basalt microspheres by microorganisms, so as to ensure that the microorganisms can enter the internal pore diameter of the basalt microspheres and have a certain survival space; at the same time, sodium alginate can further stabilize the microorganisms and is also a substance with high biocompatibility, so as to avoid affecting the activity of the microorganisms. DETAILED DESCRIPTION

[0038] The application will be further described in detail below in combination with examples.

[0039] Preparation example of modified basalt microspheres

[0040] Preparation example 1 of modified basalt microspheres

[0041] The preparation method of the modified basalt microspheres is as follows:

[0042] I, an alkali solution with pH of 8 is prepared by using sodium carbonate and water, and is reserved; porous basalt microspheres with particle size of 50-150 μm are taken and reserved.

[0043] The basalt microspheres and the alkali solution are mixed, then heated to 45℃ and reacted for 40 min, and then cooled to room temperature, so as to obtain a basalt microsphere dispersion. The amount of the alkali solution is 10 wt% of the basalt microspheres.

[0044] II, the basalt microsphere dispersion obtained in I and sodium polyacrylate are mixed and stirred at low temperature of 15℃, so as to make the reaction proceed for 60 min, then the solid is filtered and dried, so as to obtain modified basalt microspheres. The addition amount of sodium polyacrylate is 15 wt% of the basalt microspheres.

[0045] Preparation example 2 of modified basalt microspheres

[0046] The preparation method of the modified basalt microspheres is as follows:

[0047] I, an alkali solution with pH of 9.5 is prepared by using sodium hydroxide and water, and is reserved; porous basalt microspheres with particle size of 50-150 μm are taken and reserved.

[0048] Mix basalt microspheres and alkali solution, then heat to 55℃ and react for 30 min, then cool to room temperature to obtain basalt microsphere dispersion. The amount of alkali solution is 13wt% of basalt microspheres.

[0049] II, mix the basalt microsphere dispersion obtained in I and sodium polyacrylate at low temperature of 18℃ and stir to make the reaction proceed for 45 min, then filter to retain the solid and vacuum dry to obtain modified basalt microspheres. The amount of sodium polyacrylate added is 20wt% of basalt microspheres.

[0050] Preparation example 3 of modified basalt microspheres

[0051] The preparation method of modified basalt microspheres is as follows:

[0052] I, prepare an alkali solution with pH of 10 by using potassium hydroxide and water, and reserve; take porous basalt microspheres with particle size of 50-150μm, and reserve.

[0053] Mix basalt microspheres and alkali solution, then heat to 65℃ and react for 20 min, then cool to room temperature to obtain basalt microsphere dispersion. The amount of alkali solution is 15wt% of basalt microspheres.

[0054] II, mix the basalt microsphere dispersion obtained in I and sodium polyacrylate at low temperature of 20℃ and stir to make the reaction proceed for 30 min, then filter to retain the solid and vacuum dry to obtain modified basalt microspheres. The amount of sodium polyacrylate added is 25wt% of basalt microspheres.

[0055] Preparation example 4 of modified basalt microspheres

[0056] The difference between this preparation example and preparation example 2 of modified basalt microspheres is that the amount of sodium polyacrylate added is 15wt% of basalt microspheres, and the others are the same as example 2.

[0057] Preparation example 5 of modified basalt microspheres

[0058] The difference between this preparation example and preparation example 2 of modified basalt microspheres is that the amount of sodium polyacrylate added is 25wt% of basalt microspheres, and the others are the same as example 2.

[0059] Preparation example 6 of modified basalt microspheres

[0060] The difference between this preparation example and preparation example 2 of modified basalt microspheres is that the amount of sodium polyacrylate added is 10wt% of basalt microspheres, and the others are the same as example 2.

[0061] Preparation example 7 of modified basalt microspheres

[0062] The difference between the present preparation example and modified basalt microsphere preparation example 2 is that the addition amount of sodium polyacrylate is 30wt% of the basalt microspheres, and the others are the same as example 2.

[0063] Preparation example 8 of modified basalt microspheres

[0064] The difference between the present preparation example and modified basalt microsphere preparation example 2 is that the basalt microspheres are not treated with an alkali solution and are directly reacted with sodium polyacrylate.

[0065] The preparation method of the modified basalt microspheres is specifically as follows: the basalt microspheres are dispersed in water to obtain a basalt microsphere dispersion. The amount of water is 13wt% of the basalt microspheres. The basalt microsphere dispersion and sodium polyacrylate are mixed and stirred at room temperature for 45min, and then the solid is filtered and vacuum dried to obtain the modified basalt microspheres. The addition amount of sodium polyacrylate is 20wt% of the basalt microspheres.

[0066] Preparation example 9 of modified basalt microspheres

[0067] The difference between the present preparation example and modified basalt microsphere preparation example 2 is that the basalt microspheres are not treated with an alkali solution and are directly reacted with sodium polyacrylate.

[0068] The preparation method of the modified basalt microspheres is specifically as follows: an alkali solution with a pH of 9.5 is prepared by mixing sodium hydroxide and water; porous basalt microspheres with a particle size of 50-150μm are prepared. The basalt microspheres and the alkali solution are mixed, then heated to 55℃ and reacted for 30min, then cooled to room temperature, filtered to obtain a solid, and vacuum dried to obtain the modified basalt microspheres. The amount of alkali solution is 13wt% of the basalt microspheres.

[0069] Example

[0070] Example 1

[0071] A water treatment agent based on immobilized microorganisms, the specific components are: modified basalt microspheres 9kg, water 20kg, sodium alginate 0.4kg, microbial complex agent 1kg, nutrient agent 2.5kg and calcium agent 0.3kg.

[0072] The modified basalt microspheres are obtained by modified basalt microsphere preparation example 1. The microorganisms contained in the microbial complex agent are: nitrifying bacteria dry powder, denitrifying bacteria dry powder, photosynthetic bacteria dry powder, bacillus dry powder, lactic acid bacteria dry powder and acinetobacter dry powder, and the weight ratio of each microbial dry powder is 1:1:1:1:2:4, wherein the viable count of nitrifying bacteria dry powder is 10×10 10 cfu / g, the viable count of denitrifying bacteria dry powder is 1×10 10 cfu / g, and the viable count of photosynthetic bacteria dry powder is 1×1010 cfu / g, the viable bacteria amount of the Bacillus dry powder is 9 x 10 10 cfu / g, the viable bacteria amount of the lactic acid bacteria dry powder is 5 x 10 10 cfu / g, the viable bacteria amount of the Acinetobacter dry powder is 10 x 10 10 cfu / g. The nutrient agent contains carbon source, nitrogen source and trace elements required for microbial growth, and is specifically selected as an agar medium, which is commercially available. The ratio of each substance is referred to the agar medium, which contains beef extract, yeast extract, peptone and sodium chloride. The calcium agent is calcium chloride.

[0073] The preparation method of the above water treatment agent is as follows:

[0074] S1, mix the modified basalt microspheres, the microbial composite microbial agent, the nutrient agent and water in the above formula amount uniformly to obtain a mixed solution I;

[0075] Dissolve the calcium agent in water to obtain a saturated calcium solution;

[0076] Mix the sodium alginate and the mixed solution I uniformly to obtain a mixed solution II.

[0077] S2, add the saturated calcium solution to the mixed solution II, fully stir for 15 min, then filter, dry the solid to obtain the water treatment agent.

[0078] Example 2

[0079] A water treatment agent based on immobilized microorganisms, the specific components are: modified basalt microspheres 10 kg, water 23 kg, sodium alginate 0.7 kg, microbial composite microbial agent 1.2 kg, nutrient agent 2.8 kg and calcium agent 0.5 kg.

[0080] The modified basalt microspheres are obtained from the modified basalt microsphere preparation example 2. The microbial composite microbial agent and the nutrient agent are the same as in example 1.

[0081] The preparation method of the above water treatment agent is as follows:

[0082] S1, the same as example 1.

[0083] S2, add the saturated calcium solution to the mixed solution II, fully stir for 20 min, then filter, dry the solid to obtain the water treatment agent.

[0084] Example 3

[0085] A water treatment agent based on immobilized microorganisms, the specific components are: modified basalt microspheres 11 kg, water 25 kg, sodium alginate 1.0 kg, microbial composite microbial agent 1.5 kg, nutrient agent 3.0 kg and calcium agent 0.7 kg.

[0086] The modified basalt microspheres are obtained by the modified basalt microspheres preparation example 3. The microbial complex agent and the nutrient agent are the same as those in example 1.

[0087] The preparation method of the water treatment agent is as follows:

[0088] S1, the same as example 1.

[0089] S2, a saturated calcium solution is added to the mixed solution II, and the mixture is stirred for 30 min, and then filtered, and the solid is dried to obtain the water treatment agent.

[0090] Examples 4-7

[0091] Examples 4-7 and example 2 are different in that the modified basalt microspheres are different in origin, and the others are the same as example 2.

[0092] Specifically, the modified basalt microspheres in example 4 are obtained by the modified basalt microspheres preparation example 4, the modified basalt microspheres in example 5 are obtained by the modified basalt microspheres preparation example 5, the modified basalt microspheres in example 6 are obtained by the modified basalt microspheres preparation example 6, and the modified basalt microspheres in example 7 are obtained by the modified basalt microspheres preparation example 7.

[0093] Example 8

[0094] The difference between this example and example 2 is that the amount of modified basalt microspheres is 9 kg, and the others are the same as example 2.

[0095] Comparative example

[0096] Comparative example 1

[0097] The difference between this comparative example and example 2 is that the amount of modified basalt microspheres is 8 kg, and the others are the same as example 2.

[0098] Comparative examples 2-3

[0099] Comparative examples 2-3 and example 2 are different in that the modified basalt microspheres are different in origin, and the others are the same as example 2.

[0100] Specifically, the modified basalt microspheres in comparative example 2 are obtained by the modified basalt microspheres preparation example 8, and the modified basalt microspheres in comparative example 3 are obtained by the modified basalt microspheres preparation example 9.

[0101] Comparative example 4

[0102] The difference between this comparative example and example 2 is that the preparation raw material of the water treatment agent does not contain sodium alginate and calcium agent, and the others are the same as example 2.

[0103] The preparation method of the water treatment agent is as follows: the modified basalt microspheres, the microbial complex inoculant, the nutrient agent and water in the above formula amount are uniformly mixed, fully stirred and reacted for 15 min, then filtered, and the solid is dried to obtain the water treatment agent.

[0104] Performance detection test

[0105] A certain sewage is collected, and the ammonia nitrogen content is 95.43 mg / L, the nitrate nitrogen content is 38.26 mg / L, the total phosphorus content is 18.21 mg / L, and the COD content is 800 mg / L. The water treatment agent is added to the sewage in an amount of 0.35 g / L for treatment, and then the content of each index in the sewage is detected, and the specific detection results are shown in Table 1. Cr

[0106] Table 1 Change of each index after sewage is treated with different water treatment agents

[0107]

[0108]

[0109] From the data results in Table 1, it can be seen that the water treatment agent obtained by the application has good removal effect and high removal efficiency on ammonia nitrogen, nitrate nitrogen, total phosphorus and COD. Among them, it can be seen from the data results of Examples 2, 4-7 that the addition amount of sodium polyacrylate in the preparation raw material of the modified basalt microspheres has a great influence on the performance of the modified basalt microspheres: in Example 6, the addition amount of sodium polyacrylate is too small, the hydrophilicity of the modified basalt microspheres is not good, so the amount of loaded microorganisms is not enough, which leads to a significant decrease in the degradation effect of the water treatment agent on ammonia nitrogen, nitrate nitrogen, COD and total phosphorus; in Example 7, the addition amount of sodium polyacrylate is too much, and the sodium polyacrylate seriously blocks the pore size in the basalt microspheres, so that the microorganisms are difficult to enter the pore size, the growth of the microorganisms is not enough, and finally the degradation effect of the water treatment agent on ammonia nitrogen, nitrate nitrogen, COD and total phosphorus is not high.

[0110] In addition, the data results of Example 8 and Comparative Example 1 also show that the addition amount of the modified basalt microspheres should be appropriate, otherwise it will affect the loading amount of the microorganisms, and then negatively affect the degradation effect of the water treatment agent on ammonia nitrogen, nitrate nitrogen, COD and total phosphorus.

[0111] ​The data of Example 2 and Comparative Example 2 show that when the modified basalt microspheres are prepared, the alkali solution is necessary for the activation of the basalt microspheres, otherwise the loading of sodium polyacrylate is affected, and at the same time the surface roughness of the basalt microspheres is also affected, resulting in the decrease of the loading of microorganisms, and further resulting in the decrease of the degradation effect of the water treatment agent on ammonia nitrogen, nitrate nitrogen, COD and total phosphorus. Comparative Example 3 only modifies the surface of the basalt microspheres by the alkali solution, does not change the hydrophilicity, and also cannot guarantee sufficient loading of microorganisms, and also brings the result that the degradation effect of the water treatment agent on ammonia nitrogen, nitrate nitrogen, COD and total phosphorus is significantly reduced. In addition, Comparative Example 4 further strengthens the combination of microorganisms and basalt microspheres by using sodium alginate, and at the same time, due to the biological affinity of sodium alginate, the biological activity of the microorganisms is ensured, thereby ensuring the excellent treatment effect of the water treatment agent.

[0112] The water treatment agent of the present application is based on basalt microspheres as the main loading body, which has the advantage of high strength, and therefore the obtained water treatment agent can be washed for a long time in the sewage flow and still maintain its structural integrity, and therefore has the advantage of long service life.

[0113] The specific embodiments are only an explanation of the present application, and are not a limitation of the present application, and those skilled in the art can make modifications to the embodiments without creative contribution according to the needs after reading the present specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A water treatment agent based on immobilized microorganisms, characterized in that: The invention comprises the following components in parts by weight: 90-110 parts of modified basalt microspheres, 200-250 parts of water, 4-10 parts of sodium alginate, 10-15 parts of microbial composite agent, 25-30 parts of nutrient agent and 3-7 parts of calcium agent; The modified basalt microspheres are obtained by treating the basalt microspheres with an alkali solution and then loading the basalt microspheres with sodium polyacrylate. The modified basalt microspheres are prepared by a method comprising the following steps: I. heating and mixing basalt microspheres and an alkaline solution to react, and cooling to obtain a basalt microsphere dispersion; II. Mixing the basalt microsphere dispersion and sodium polyacrylate at low temperature and drying to obtain modified basalt microspheres; wherein the amount of sodium polyacrylate used is 15-25% by weight of the basalt microspheres; The nutrient agent includes a carbon source, a nitrogen source, trace elements and auxiliary growth factors required for microbial growth; the particle size of the basalt microspheres is 50-150 μm; and the calcium agent is selected from calcium chloride or calcium nitrate.

2. The water treatment agent based on immobilized microorganisms according to claim 1, characterized in that The pH value of the alkaline solution is 8-10; the amount of the alkaline solution used is 10-15% of the weight of the basalt microspheres.

3. The water treatment agent based on immobilized microorganisms according to claim 1, characterized in that In step I, the heating temperature is 45-65° C. and the reaction time is 20-40 min.

4. The water treatment agent based on immobilized microorganisms according to claim 1, characterized in that II The low temperature is 15-20℃ and the mixing time is 30-60min.

5. The water treatment agent based on immobilized microorganisms according to claim 1, characterized in that The microbial composite agent contains at least one of ammonia nitrogen removal bacteria, nitrate nitrogen removal bacteria, phosphate accumulation bacteria, and COD removal bacteria.

6. A method for preparing a water treatment agent based on immobilized microorganisms according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1, uniformly mixing the modified basalt microspheres, the microbial composite agent, the nutrient agent and a formulated amount of water to obtain a mixed solution I; dissolving the calcium agent in water to obtain a saturated calcium solution; Evenly mixing the sodium alginate and the mixed solution I to obtain a mixed solution II; S2. Add the saturated calcium solution to the mixed solution II, react, separate, and dry the solid to obtain a water treatment agent.

7. The method for preparing a water treatment agent based on immobilized microorganisms according to claim 6, characterized in that: The reaction time in S2 is 15-30 min.

8. Use of the water treatment agent based on immobilized microorganisms according to any one of claims 1 to 5 in sewage treatment.

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