Medium composite cleaning source for improving water quality of river and preparation method thereof

Abstract

The present application relates to river treatment technical field, specifically to a kind of medium composite cleaning source of river water quality promotion and its preparation method;A kind of medium composite cleaning source of river water quality promotion is composed of the following percentage components: 1-2% mixed bacteria, 15-20% alumina, 5-10% bentonite, 15-20% biomass porous carbon, 10-15% diatomite, 5-10% polyacrylamide, 15-20% ferroferric oxide, 5-10% sodium alginate, 2-5% bamboo fiber;The present application is by combining the physical adsorption of mineral and the biodegradation of microorganism two kinds of purification mode, form double purification, make water quality promotion effect more significant and persistent, by synergistic purification make the improvement of water quality index not only quickly, and the present application uses a lot of natural material source is extensive, can ensure that treatment agent in entire use cycle will not produce secondary pollution simultaneously.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of river treatment, in particular to a medium composite cleaning source for improving river water quality and a preparation method thereof. BACKGROUND

[0002] With the acceleration of industrialization and urbanization, water pollution has gradually become a global environmental problem. Industrial wastewater, agricultural non-point source pollution, and urban sewage have become the main pollution sources, leading to problems such as water eutrophication, heavy metal pollution, and accumulation of toxic and harmful substances. These pollutions not only harm the survival of aquatic organisms, but also directly affect the safety of drinking water for humans, and even threaten the sustainability of global water resources. The traditional water quality improvement method has problems such as long treatment period, high cost, and complex operation.

[0003] Publication No. CN118529809A discloses a comprehensive water quality improvement algae inhibitor and its preparation method and application, which can significantly remove algae in polluted water bodies, but has poor effect on water eutrophication and heavy metal pollution. Publication No. CN114890535A discloses a composite environmental protection water purifying agent suitable for river and lake water quality improvement and its manufacturing method, which can significantly remove toxic and harmful substances in water bodies by physical adsorption and chemical sedimentation, but has poor effect in dead water areas. Therefore, an efficient water quality improvement technology that can be used for a long time is needed, especially for purification treatment in still water bodies such as dead water areas and deep water areas.

[0004] In view of the above problems, the present application provides a solution. SUMMARY

[0005] The present application aims to provide a medium composite cleaning source for improving river water quality and a preparation method thereof, which can efficiently and cost-effectively clean still water bodies for a long time, and is suitable for purification treatment in dead water areas and deep water areas, while still having excellent cleaning effect in live water quality improvement.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solution: a medium composite cleaning source for improving river water quality is composed of the following percentage components: 1-2% mixed bacteria, 15-20% aluminum oxide, 5-10% bentonite, 15-20% biomass porous carbon, 10-15% diatomite, 5-10% polyacrylamide, 15-20% ferroferric oxide, 5-10% sodium alginate, and 2-5% bamboo fiber.

[0007] The mixed bacteria are composed of nitrobacter, bacillus subtilis, bacillus, rhizobium, and bauman acinetobacter.

[0008] The preparation method of the biomass porous carbon includes the following steps:

[0009] A1: Add the coconut shell, tree bark and straw mixture into an ultrasonic cleaning instrument, add deionized water, set the ultrasonic frequency to 80-100 kHz, and ultrasonically clean for 15-20 min. After ultrasonic cleaning, transfer the coconut shell, tree bark and straw mixture to an oven, set the oven air speed to 1.5 m / s, and dry at 60℃ for 1-2 h to make the moisture content of the coconut shell, tree bark and straw mixture 3%. Finally, add the coconut shell, tree bark and straw mixture into a crusher, set the crushing particle size to 200 mesh, and crush for 30 min. Then, pass the crushed mixture through a 200 mesh filter to obtain the biomass crushed material;

[0010] A2: Mix the biomass crushed material with potassium hydroxide and add them into a magnetic stirrer. Set the stirring speed of the magnetic stirrer to 500-600 rpm, and stir for 15-20 min. Then, add 15% concentrated phosphoric acid into the magnetic stirrer to obtain the activated biomass crushed material;

[0011] A3: Add the activated biomass crushed material into a pyrolysis furnace, and pass carbon dioxide into the furnace. Use the carbon dioxide to adjust the gas pressure of the furnace to 1.6-1.8 atm, and simultaneously heat and pyrolyze. Set the heating program of the furnace to increase the temperature by 25℃ per min, and heat to 450℃. After the temperature is increased, maintain 450℃ for 30 min. Then, adjust the heating program of the furnace to increase the temperature by 30℃ per min, and heat to 900℃. After the temperature is increased, pass air into the furnace, and slowly release the carbon dioxide. Maintain the gas pressure in the furnace, and maintain the temperature at 900℃ for 30 min to obtain the biomass pyrolysis carbon;

[0012] A4: Wash the biomass pyrolysis carbon with deionized water. After washing, add the biomass pyrolysis carbon into a crusher, and set the mesh size of the crusher to 1000 mesh. Crush for 30 min, and then pass the crushed material through a 1000 mesh filter. Repeat the crushing and filtering process once, and then collect the filtered product to obtain the biomass porous carbon.

[0013] Further, in step A1, the mass ratio of coconut shell, tree bark and straw in the mixture is 1:3:6. In step A1, the mass ratio of the coconut shell, tree bark and straw mixture and deionized water is 1:2. In step A3, the volume ratio of carbon dioxide and air is 1:9. In step A2, the mass ratio of biomass crushed material, potassium hydroxide and 15% concentrated phosphoric acid is 4:1:5.

[0014] Further, a preparation method of a medium composite cleaning source for improving river water quality includes the following steps:

[0015] B1: Put bentonite and diatomite into a grinder, set the grinding particle size to 800 mesh, grind for 30 min, then pass through an 800 mesh filter screen, re-add the un-passed filter screen to the grinder for grinding once, collect the 800 mesh filter screen filtered product, then mix the biomass porous carbon with the 800 mesh filter screen filtered product into a magnetic stirrer, set the stirring rate to 600-800 rpm, stir and mix for 30 min to obtain a mixed carbon soil;

[0016] B2: Put the mixed carbon soil, aluminum oxide, ferroferric oxide and sodium alginate into a reaction kettle, set the magnetic stirrer speed to 800-1000 rpm and heat to 45-50 DEG C at the same time, stir and mix for 10 min, then add polyacrylamide and bamboo fiber, heat to 55-60 DEG C and stir and mix for 30 min to obtain a physical adsorption composition;

[0017] B3: Mix the physical adsorption composition with the mixed bacteria and put it into a homogenizer, homogenize for 30 min, then transfer the composite cleaning medium into a polyvinyl alcohol film, use a methyl cellulose adhesive to bond the polyvinyl alcohol film to seal the composite cleaning source;

[0018] B4: Heat the bio-based polyethylene to 120-130 DEG C, then melt the bio-based polyethylene into a flowable liquid, put the bio-based polyethylene into a porous spherical mold prepared in advance, and obtain a porous spherical shell after cooling to room temperature, put the composite cleaning source into the porous spherical shell to obtain a river water quality improving medium composite cleaning source.

[0019] Further, the mass ratio of the mixed bacteria of Nitrosomonas, Bacillus subtilis, Bacillus, Rhizobium and Acinetobacter baumannii is 1:1:1:1:1; the ferroferric oxide is black powder ferroferric oxide powder with a specification of 1000 mesh; the sodium alginate is white sodium alginate powder with a specification of 600 mesh; and the bamboo fiber is solid bamboo fiber powder with a specification of 100 mesh.

[0020] As described above, due to the adoption of the above technical solutions, the present application has the following advantages: the present application combines the physical adsorption of minerals and the biological degradation of microorganisms to form double purification, so that the water quality improvement effect is more significant and lasting. The minerals not only provide strong adsorption capacity to remove harmful substances and soluble pollutants in water, but also effectively adjust the pH value of the water body, thereby enhancing the stability of the water quality. The microorganisms further decompose organic pollutants in water through their metabolic activities during the purification process, thereby greatly improving the efficiency of water purification. Through synergistic purification, the improvement of water quality indicators is not only rapid, but also the large amount of natural materials used in the present application have a wide source, and at the same time, it can ensure that the treatment agent will not cause secondary pollution during the entire use cycle. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in combination with specific embodiments.

[0022] The experimental methods in the following examples are all conventional methods, which are carried out according to the techniques or conditions described in the literature in the field or according to the product instructions, unless otherwise specified. The materials, reagents, etc. used in the following examples can be obtained from commercial channels, unless otherwise specified.

[0023] Example 1

[0024] 1: 1 kg of coconut shell, 3 kg of tree bark, and 6 kg of straw were mixed and then added to an ultrasonic cleaning instrument. 20 kg of deionized water was added, the ultrasonic frequency was set to 100 kHz, and ultrasonic cleaning was performed for 20 min. After ultrasonic cleaning, the mixture of coconut shell, tree bark, and straw was transferred to an oven, the oven air speed was set to 1.5 m / s, and the temperature was set to 60°C for drying for 2 h to make the moisture content of the mixture of coconut shell, tree bark, and straw 3%. Finally, the mixture of coconut shell, tree bark, and straw was added to a crusher, the crushing particle size was set to 200 mesh, and crushing was performed for 30 min. After crushing, the mixture was filtered through a 200-mesh filter screen to obtain 2 kg of biomass crushing material.

[0025] 2: 2 kg of biomass crushing material was mixed with 500 g of potassium hydroxide and added to a magnetic stirrer. The stirring speed of the magnetic stirrer was set to 600 rpm, and stirring was performed for 20 min. Then, 2.5 kg of 15% concentrated phosphoric acid was added to the magnetic stirrer to obtain activated biomass crushing material.

[0026] 3: The activated biomass crushing material was added to a pyrolysis furnace. Carbon dioxide was introduced into the pyrolysis furnace to adjust the gas pressure of the pyrolysis furnace to 1.8 atm. At the same time, the temperature was increased for pyrolysis. The temperature increase program of the pyrolysis furnace was set to 25°C per min. The temperature was increased to 450°C. After the temperature was increased, the temperature was maintained at 450°C for 30 min. After the temperature was maintained, the temperature increase program of the pyrolysis furnace was adjusted to 30°C per min. The temperature was increased to 900°C. After the temperature was increased, air was introduced into the pyrolysis furnace, and the carbon dioxide was slowly released. The volume ratio of air to carbon dioxide in the pyrolysis furnace was 1:9. The gas pressure in the pyrolysis furnace was maintained, and the temperature was maintained at 900°C for pyrolysis for 30 min to obtain 1.4 kg of biomass pyrolysis carbon.

[0027] 4: The biomass pyrolysis carbon was washed with deionized water. After washing, the biomass pyrolysis carbon was added to a crusher. The mesh size of the crusher was set to 1000 mesh, and crushing was performed for 30 min. Then, the biomass pyrolysis carbon that did not pass through the filter screen was re-added to the crusher and crushed again. Then, the biomass pyrolysis carbon was filtered through a 1000-mesh filter screen. The filtered product was collected to obtain 900 g of biomass porous carbon prepared in Example 1.

[0028] Table 1, reagent parameter table used in Example 1

[0029] Drug name Source Model Parameter Potassium hydroxide Aladdin P112287 500g Phosphoric acid Aladdin P123765 4L

[0030] Example 2

[0031] 1: 2 kg of coconut shell, 6 kg of tree bark and 12 kg of straw were mixed and added to an ultrasonic cleaning instrument, deionized water was added, the ultrasonic frequency was set to 80 kHz, and ultrasonic cleaning was performed for 20 min. After ultrasonic cleaning, the cotton seed shells were transferred to an oven, the oven air speed was set to 1.5 m / s, the temperature was set to 60°C, and drying was performed for 1.5 h to obtain a mixture of coconut shell, tree bark and straw with a moisture content of 3%. Finally, the mixture of coconut shell, tree bark and straw was added to a crusher, the crushing particle size was set to 200 mesh, and crushing was performed for 30 min. The crushed mixture was then filtered through a 200 mesh sieve to obtain 4 kg of biomass crushing material;

[0032] 2: 4 kg of biomass crushing material was mixed with 1 kg of potassium hydroxide and added to a magnetic stirrer. The stirring speed of the magnetic stirrer was set to 600 rpm, and stirring was performed for 20 min. Subsequently, 5 kg of 15% concentrated phosphoric acid was added to the magnetic stirrer to obtain activated biomass crushing material;

[0033] 3: The activated biomass crushing material was added to a pyrolysis furnace, carbon dioxide was introduced into the pyrolysis furnace, and the gas pressure of the pyrolysis furnace was adjusted to 1.6 atm using carbon dioxide. At the same time, the temperature was increased for pyrolysis, and the temperature increase program was set to 25°C per min. The temperature was increased to 450°C, and after the temperature was increased, the temperature was maintained at 450°C for 30 min. After the temperature was maintained, the temperature increase program was adjusted to 30°C per min, and the temperature was increased to 900°C. After the temperature was increased, air was introduced into the pyrolysis furnace, and carbon dioxide was slowly released. The volume ratio of air to carbon dioxide in the pyrolysis furnace was 1:9, the gas pressure in the pyrolysis furnace was maintained, and the temperature was maintained at 900°C for 30 min to obtain 3 kg of biomass pyrolysis carbon;

[0034] 4: Deionized water was used to wash the biomass pyrolysis carbon. After washing, the biomass pyrolysis carbon was added to a crusher, the mesh size of the crusher was set to 1000 mesh, and crushing was performed for 30 min. Subsequently, the biomass pyrolysis carbon that did not pass through the filter screen was re-added to the crusher and crushed again. Then, the biomass pyrolysis carbon was filtered through a 1000 mesh sieve, and the filtered product was collected to obtain 2.1 kg of biomass porous carbon prepared in Example 2.

[0035] Table 2, reagent parameter table used in Example 2

[0036] Drug name Source Model Parameter Potassium hydroxide Aladdin P112287 500g Phosphoric acid Aladdin P123765 4L

[0037] Example 3

[0038] 1: 100 g of bentonite and 150 g of diatomite were added to a grinder, the grinding particle size was set to 800 mesh, and grinding was performed for 30 min followed by passing through an 800 mesh filter screen. The un-passed filter screen was re-added to the grinder for grinding once. The 800 mesh filter screen filtered product was collected. Then, 200 g of biomass porous carbon prepared in Example 1 and the 800 mesh filter screen filtered product were mixed and added to a magnetic stirrer, the stirring rate was set to 800 rpm, and stirring and mixing were performed for 30 min to obtain a mixed carbon soil;

[0039] 2: The mixed carbon soil, 200 g of aluminum oxide, 200 g of ferric oxide, and 100 g of sodium alginate were added to a reaction kettle, the magnetic stirrer speed was set to 1000 rpm, and the temperature was increased to 50°C. Stirring and mixing were performed for 10 min, then 100 g of polyacrylamide and 50 g of bamboo fiber were added, the temperature was increased to 60°C, and stirring and mixing were performed for 30 min to obtain a physical adsorption composition;

[0040] 3: The physical adsorption composition was mixed with 4 g of Pseudomonas nitrificans, 4 g of Bacillus subtilis, 4 g of Bacillus, 4 g of Rhizobium, and 4 g of Acinetobacter baumannii, and was added to a homogenizer. Homogenization was performed for 30 min. After homogenization was completed, a composite cleaning medium was obtained. Then, the composite cleaning medium was transferred to a polyvinyl alcohol film, and a methyl cellulose adhesive was used to bond and seal the polyvinyl alcohol film to obtain a composite cleaning source.

[0041] 4: The bio-based polyethylene was heated to 130°C, and then the bio-based polyethylene was melted into a flowable liquid. The bio-based plastic was added to a pre-prepared porous spherical mold. After cooling to room temperature, a porous spherical shell was obtained. The composite cleaning source was placed in the porous spherical shell to obtain a medium composite cleaning source for river water quality improvement prepared in Example 3.

[0042] Table 3, reagent parameter table used in Example 3

[0043]

[0044]

[0045] Example 4

[0046] 1: 50 g of bentonite and 100 g of diatomite were added to a grinder, the grinding particle size was set to 800 mesh, and grinding was performed for 30 min followed by passing through an 800 mesh filter screen. The un-passed filter screen was re-added to the grinder for grinding once. The 800 mesh filter screen filtered product was collected. Then, 150 g of biomass porous carbon prepared in Example 2 and the 800 mesh filter screen filtered product were mixed and added to a magnetic stirrer, the stirring rate was set to 600 rpm, and stirring and mixing were performed for 30 min to obtain a mixed carbon soil;

[0047] 2: Add mixed carbon soil, 150 g of alumina, 150 g of ferriferrous oxide, and 50 g of sodium alginate into a reaction kettle, set the speed of the magnetic stirrer to 1000 rpm, and heat to 50°C at the same time, stir and mix for 10 min, then add 50 g of polyacrylamide and 20 g of bamboo fiber, heat to 55°C and stir and mix for 30 min to obtain a physical adsorption composition;

[0048] 3: Mix the physical adsorption composition with 2 g of nitrobacter, 2 g of bacillus subtilis, 2 g of bacillus, 2 g of rhizobium, and 2 g of bauman acinetobacter, and add them into a homogenizer, homogenize for 30 min, and obtain a composite cleaning medium after homogenization, then transfer the composite cleaning medium into a polyvinyl alcohol film, use methyl cellulose adhesive to bond the hydrolyzed film to seal the composite cleaning source;

[0049] 4: Heat the bio-based polyethylene to 125°C, then melt the bio-based polyethylene into a flowable liquid, add the bio-based plastic into the pre-prepared porous spherical mold, and obtain a porous spherical shell after cooling to room temperature, then put the composite cleaning source into the porous spherical shell to obtain a medium composite cleaning source for river water quality improvement prepared in Example 4.

[0050] Table 4, reagent parameter table used in Example 4

[0051] Drug name Source Model Parameter Bentonite Shijiazhuang Zhengyu New Material Co., Ltd. 20230512 800 mesh Diatomaceous earth Lingshou Shuanglong Mining Co., Ltd. Gzt05 2 kg Alumina Shanghai Jiuye International Trade Co., Ltd. 254936917 1 kg Iron tetroxide Shandong Aofeite New Material Co., Ltd. 2-1000 5 kg Sodium alginate Jiangsu Changjing Bioengineering Co., Ltd. 101 5 kg Polyacrylamide Gongyi Xinqi Chemical Factory 20210916 5 kg Bamboo fiber Changxing Tianhe Building Material Co., Ltd. TH-014 5 kg Nitrosomonas Baosai Biology 19718 10 6 cfu Bacillus subtilis Shanghai Shifeng Biology SJ01199 10 6 cfu Bacillus Mingzhou Biology B80469 10 6 cfu Rhizobium Mingzhou Biology B81562 10 6 cfu Acinetobacter baumannii Huawenna Biology 01266L 10 6 cfu

[0052] Comparative Example 1

[0053] Select Example 4 of CN118529809A as Comparative Example 1.

[0054] Comparative Example 2

[0055] Select Example 1 of CN114890535A as Comparative Example 2.

[0056] River cleaning experiment

[0057] Select Xiaoyan River in Neixiang County, Nanyang City, Henan Province as the river test site, select the pollution area in the middle reaches of Xiaoyan River as the test site, use the dam to divide the 40 m wide river into 8 m sub-flow channels, the dam length is 200 m, the total river is divided into 4 groups of 200 m long and 8 m wide sub-flow channels, Comparative Example 1 and Comparative Example 2 are used in the 4 groups of river channels, the input amount is 1 / 1000 of the water flow, and the experiment lasts for 60 days, and the pollution cleaning situation of the sub-flow channels is recorded after 60 days.

[0058] Table 5, river cleaning experiment results

[0059]

[0060] From the analysis of Table 5, it can be seen that the composite cleaning source prepared in Example 3 and Example 4 can significantly improve the pollution of phosphorus, ammonia nitrogen and suspended solids in the polluted river, and can significantly reduce the chemical oxygen demand of the river, can effectively remove microorganisms and plankton algae in the polluted river, and therefore can significantly improve the transparency of the polluted river.

[0061] Dead water cleaning experiment

[0062] A seriously polluted artificial lake was selected, and the artificial lake was divided into four small artificial lakes with a length of 15 m, a width of 6 m and a depth of 8 m by using an intercept dam. The composite cleaning source prepared in Example 3, the composite cleaning source prepared in Example 4, Comparative Example 1 and Comparative Example 2 were respectively put into the four small artificial lakes, and the amount of the put-in was one thousandth of the dead water content. After 60 days of standing, the water quality was detected.

[0063] Table 6, dead water cleaning experiment results

[0064]

[0065] From the analysis of Table 6, it can be seen that the traditional water purifying agent has greatly reduced cleaning effect in the dead water area due to the lack of water flow effect. On the contrary, the cleaning source prepared in Example 3 and Example 4 can effectively clean the pollution of phosphorus, ammonia nitrogen and suspended solids in the dead water area through the multiple effects of physical adsorption, chemical precipitation and biological decomposition, and has obvious advantages in the cleaning of artificial landscape.

[0066] The above shows and describes the basic principles and main features of the present application and the advantages of the present application. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A medium composite cleaning source for improving water quality in a river, characterized by, The percentage composition is composed of 1-2% mixed bacteria, 15-20% alumina, 5-10% bentonite, 15-20% biomass porous carbon, 10-15% diatomite, 5-10% polyacrylamide, 15-20% ferroferric oxide, 5-10% sodium alginate, and 2-5% bamboo fiber. The mixed bacteria are composed of nitrobacter, bacillus subtilis, bacillus, rhizobium, and bauman acinetobacter. The preparation method of the biomass porous carbon comprises the following steps: A1: The mixture of coconut shell, tree bark and straw is added to an ultrasonic cleaning instrument, deionized water is added, the ultrasonic frequency is set to 80-100 kHz, and ultrasonic cleaning is performed for 15-20 min. After ultrasonic cleaning, the mixture of coconut shell, tree bark and straw is transferred to an oven, the oven air speed is set to 1.5 m / s, and the temperature is set to 60°C for drying for 1-2 h to make the moisture content of the mixture of coconut shell, tree bark and straw 3%. Finally, the mixture of coconut shell, tree bark and straw is added to a crusher, the crushing particle size is set to 200 mesh, and crushing is performed for 30 min. After crushing, the mixture is filtered through a 200 mesh sieve to obtain biomass crushed material. A2: The biomass crushed material and potassium hydroxide are mixed and added to a magnetic stirrer, the stirring speed of the magnetic stirrer is set to 500-600 rpm, and stirring and mixing are performed for 15-20 min. Then, 15% concentrated phosphoric acid is added to the magnetic stirrer to obtain activated biomass crushed material. A3: The activated biomass crushed material is added to a pyrolysis furnace, carbon dioxide is introduced into the pyrolysis furnace, and the gas pressure of the pyrolysis furnace is adjusted to 1.6-1.8 atm using carbon dioxide. At the same time, pyrolysis is performed by increasing the temperature, and the temperature increasing program of the pyrolysis furnace is set to 25°C per min. The temperature is increased to 450°C, and after the temperature is increased, the temperature is maintained at 450°C for 30 min. After the temperature is maintained, the temperature increasing program of the pyrolysis furnace is adjusted to 30°C per min, and the temperature is increased to 900°C. After the temperature is increased, air is introduced into the pyrolysis furnace, and carbon dioxide is slowly released. The gas pressure in the pyrolysis furnace is kept constant, and the temperature is maintained at 900°C for 30 min to obtain biomass pyrolysis carbon. A4: The biomass pyrolysis carbon is washed with deionized water. After washing, the biomass pyrolysis carbon is added to a crusher, the mesh size of the crusher is set to 1000 mesh, and crushing is performed for 30 min. Then, the biomass pyrolysis carbon that does not pass through the sieve is added to the crusher again for repeated crushing, and then filtered through a 1000 mesh sieve. The filtered product is collected to obtain biomass porous carbon.

2. The medium composite cleaning source for river water quality improvement according to claim 1, characterized in that, In step A1, the mass ratio of coconut shell, tree bark and straw in the mixture of coconut shell, tree bark and straw is 1:3:

6.

3. The medium composite cleaning source for river water quality improvement according to claim 1, characterized in that, In step A1, the mass ratio of the mixture of coconut shell, tree bark and straw and deionized water is 1:

2.

4. The medium composite cleaning source for river water quality improvement according to claim 1, characterized in that, In step A3, the volume ratio of carbon dioxide and air is 1:

9.

5. The medium composite cleaning source for river water quality improvement according to claim 1, characterized in that, In step A2, the mass ratio of biomass crushed material, potassium hydroxide and 15% concentrated phosphoric acid is 4:1:

5.

6. The medium composite cleaning source for river water quality improvement according to claim 1, characterized in that, The mass ratio of nitrobacter, bacillus subtilis, bacillus, rhizobium and bauman acinetobacter in the mixed bacteria is 1:1:1:1:

1.

7. The medium composite cleaning source for river water quality improvement according to claim 1, characterized in that, The ferroferric oxide is black powder, and the specification is 1000 mesh.

8. The medium composite cleaning source for river water quality improvement according to claim 1, characterized in that, The sodium alginate is white sodium alginate powder with a specification of 600 mesh.

9. The medium composite cleaning source for river water quality improvement according to claim 1, characterized in that, The bamboo fiber is solid bamboo fiber powder with a specification of 100 mesh.

10. The method for preparing a composite clean source for improving river water quality according to claim 1, characterized in that, The method comprises the following steps: B1: Put bentonite and diatomite into a grinder, set the grinding particle size to 800 mesh, grind for 30 min, then pass through an 800 mesh filter screen, re-add the un-passed filter screen to the grinder for grinding once, collect the 800 mesh filter screen filtered product, then mix the biomass porous carbon with the 800 mesh filter screen filtered product and add them into a magnetic stirrer, set the stirring speed to 600-800 rpm, stir and mix for 30 min to obtain mixed carbon soil; B2: Put the mixed carbon soil, aluminum oxide, ferric oxide and sodium alginate into a reaction kettle, set the magnetic stirrer speed to 800-1000 rpm and heat to 45-50℃ at the same time, stir and mix for 10 min, then add polyacrylamide and bamboo fiber, heat to 55-60℃ and stir and mix for 30 min to obtain a physical adsorption composition; B3: Mix the physical adsorption composition with the mixed bacteria and add them into a homogenizer, homogenize for 30 min, obtain a composite cleaning medium after homogenization, then transfer the composite cleaning medium into a polyvinyl alcohol film, use methyl cellulose adhesive to bond the polyvinyl alcohol film to seal to obtain a composite cleaning source; B4: Heat the bio-based polyethylene to 120-130℃, then melt the bio-based polyethylene into a flowable liquid, add the bio-based polyethylene into a porous spherical mold prepared in advance, obtain a porous spherical shell after cooling to room temperature, put the composite cleaning source into the porous spherical shell to obtain a medium composite cleaning source for improving river water quality.

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