Method for aerobic composting of blue-green algae and reed straws in reservoir and application of method

Abstract

The invention provides an aerobic composting method and application of reservoir blue-green algae and reed straws, the reservoir blue-green algae, reed straws and the like are used as raw materials, a thermophilic microbial agent is used for performing aerobic composting treatment on the raw materials, and a nano zero-valent iron / biochar composite material is added, so that the aerobic composting effect is achieved. By using the material, the electron transfer rate between microbial species in an aerobic composting system is increased, H2S and other foul gases released in the composting process are efficiently reduced, and the odor emission intensity is effectively reduced while the decomposition speed of organic matters in the aerobic composting process of organic wastes is increased.

Description

Technical Field

[0001] The invention relates to the technical field of fertilizers, in particular to a method for aerobic composting of reservoir blue algae and reed straw and application thereof. Background Art

[0002] As we all know, the construction of water source reservoirs is an important means to ensure water supply security. However, during the construction and operation of reservoirs, a large amount of sediment, reed straw, blue algae and other substances are also produced, which have a certain negative impact on the water quality and landscape of the reservoir. Reasonable and resourceful utilization and disposal of wastes such as blue algae and reed straw in reservoirs can significantly improve the natural ecological effect of reservoirs, while effectively reducing the safety risks of water source reservoirs.

[0003] Aerobic composting is a commonly used method for treating organic solid waste. During the aerobic composting process, microorganisms in the compost body continuously metabolize the organic matter in the compost body, degrade the toxic substances in the compost body, fix the nutrients in the compost, and finally form an organic fertilizer with high application value. However, in the aerobic composting process of organic waste such as cyanobacteria and crop straw, there are shortcomings such as slow decomposition speed, long composting cycle, and serious odor pollution. At present, the research on aerobic composting effect enhancement technology is mostly focused on solving the above-mentioned single problem, while there is a lack of methods to simultaneously accelerate the decomposition rate, shorten the composting time, and effectively control the odor intensity of the compost body. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a method for aerobic composting of reservoir cyanobacteria and reed straw and its application, so as to solve the problems of slow decomposition speed, long composting cycle and serious odor pollution in the prior art.

[0005] To achieve the above-mentioned object and other related objects, the present invention provides a method for aerobic composting of reservoir cyanobacteria and reed straw, comprising the following steps:

[0006] The raw materials are cyanobacteria from the reservoir and reed straw, which are fermented by thermophilic microorganisms and bacteria, and a composite material of nano zero-valent iron / biochar is added. The raw materials are aerobically fermented until they are mature, and compost fertilizer is obtained.

[0007] Preferably, the thermophilic microbial agent is selected from any one or more of endophytic Bacillus, thermophilic sporothrix, thermophilic Thermus, and thermocellulophilic Clostridium.

[0008] Preferably, the total colony count of the thermophilic microbial agent is ≥ 1.2×10 8 CFU / g.

[0009] Preferably, the dosage of the thermophilic high-temperature microbial agent is 0.5% to 1.5% of the weight of the compost raw material.

[0010] Preferably, the dry weight ratio of the reservoir cyanobacteria to reed straw is 8:1 to 4:1.

[0011] Preferably, the mass ratio of the composite material to the mixed dry weight of reservoir cyanobacteria and reed straw is 0.002:1 to 0.01:1.

[0012] Preferably, the particle size of the nano zero-valent iron in the composite material is 100-500 nm.

[0013] Preferably, the biochar in the composite material is selected from any one or more of wheat straw biochar, corn straw biochar, rice straw biochar, sorghum straw biochar, and cotton straw biochar.

[0014] Preferably, the mass ratio of nano zero-valent iron to biochar in the composite material is 1:4 to 1:12.

[0015] Preferably, the fermentation time is 20 to 25 days.

[0016] The present invention also provides an application of the reservoir cyanobacteria and reed straw aerobic compost fertilizer prepared by the method described above in promoting plant growth and / or improving soil.

[0017] As described above, the method and application of aerobic composting of reservoir cyanobacteria and reed straw of the present invention have the following beneficial effects:

[0018] The method for aerobic composting of reservoir cyanobacteria and reed straw of the present invention promotes the humification efficiency of organic solid wastes such as reservoir cyanobacteria and reed straw during aerobic composting by adding nano zero-valent iron / biochar composite materials to the reservoir cyanobacteria and reed straw raw materials, which not only achieves the reduction of the above-mentioned organic wastes, but also greatly improves the aerobic composting efficiency, achieves the purpose of organic waste resource utilization, and also significantly and effectively controls the odor intensity.

[0019] The method for aerobic composting of reservoir cyanobacteria and reed straw of the present invention utilizes nano zero-valent iron / biochar composite materials to accelerate the electron transfer rate between microbial species in the aerobic composting system, efficiently reduce malodorous gases such as H2S released during the composting process, and effectively reduce the odor emission intensity while accelerating the decomposition rate of organic matter during the aerobic composting of organic waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a scanning electron microscope image of the nano zero-valent iron / biochar composite material prepared in Example 2 of the present invention. DETAILED DESCRIPTION

[0021] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0022] When a numerical range is disclosed herein, the above range is deemed to be continuous and includes the minimum and maximum values ​​of the range, as well as every value between such minimum and maximum values. Further, when a range refers to an integer, every integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be merged. In other words, unless otherwise indicated, all ranges disclosed herein should be understood to include any and all sub-ranges included therein. For example, a specified range from "1 to 10" should be deemed to include any and all sub-ranges between a minimum of 1 and a maximum of 10. Exemplary sub-ranges of ranges 1 to 10 include, but are not limited to, 1 to 6.1, 3.5 to 7.8, 5.5 to 10, and the like.

[0023] Furthermore, it should be understood that one or more method steps mentioned in the present invention do not exclude the possibility that other method steps may exist before or after the combined steps or that other method steps may be inserted between these explicitly mentioned steps, unless otherwise stated.

[0024] A first aspect of the present invention provides a method for aerobic composting of reservoir cyanobacteria and reed straw, comprising the following steps:

[0025] The raw materials are cyanobacteria from the reservoir and reed straw, which are fermented by thermophilic microorganisms and bacteria, and a composite material of nano zero-valent iron / biochar is added. The raw materials are aerobically fermented until they are mature, and compost fertilizer is obtained.

[0026] Reservoir cyanobacteria mainly include Pseudan-abaena, Limnothrix, Microcystis and Dactylococcopsis.

[0027] Reed, Latin name: Phragmites australis.

[0028] The present invention utilizes nano zero-valent iron / biochar composite materials to accelerate the decomposition rate of organic matter in the aerobic composting process of reservoir cyanobacteria and reed straw, while effectively removing the generated odor, thereby significantly reducing the odor intensity.

[0029] Specifically: the aerobic composting is a biochemical process that relies on the action of specialized and facultative aerobic bacteria to degrade organic matter. The organic material to be composted is mixed with the filler in a certain proportion. Under suitable moisture and ventilation conditions, the microorganisms are propagated and degraded to generate high temperature, kill the pathogens and weed seeds therein, stabilize and mature the organic matter, and obtain organic fertilizer products. In the aerobic composting process, the soluble small-molecule organic matter in the organic waste is absorbed and utilized by the microorganisms through the cell wall and cell membrane of the microorganisms. The insoluble macromolecular organic matter first attaches to the outside of the microorganism, and is decomposed into soluble small-molecule substances by the extracellular enzymes secreted by the microorganisms, and then input into its cells for use by the microorganisms. Through the life activities (synthesis and decomposition processes) of the microorganisms, a part of the absorbed organic matter is oxidized into simple inorganic matter, and the energy required for the activity is provided, and the other part of the organic matter is converted into new cell substances for the proliferation of microorganisms. It can be seen that aerobic composting is an electron transfer process from macromolecular organic matter to small-molecule organic matter dominated by the action of microorganisms. By regulating the electron transfer process during aerobic composting, it is expected that the aerobic composting effect can be improved. The biochar in the nano zero-valent iron / biochar has the performance of accelerating the electron transfer efficiency. However, in the aerobic composting system of organic waste, there has been no report on the research on enhancing the electron transfer efficiency by adding nano zero-valent iron / biochar to improve the decomposition effect of organic matter. At the same time, in the aerobic composting process, odors such as H2S are also an important problem that plagues the composting treatment of organic solid wastes such as straw. Effectively solving the odor pollution problem is the key to promoting the engineering application of aerobic fermentation technology. The nano zero-valent iron in the nano zero-valent iron / biochar composite material of the present invention has a high reaction activity, and will react with substances such as H2S to form iron sulfide, which significantly reduces the odor emission intensity.

[0030] In the method of the present invention, the thermophilic microbial agent is selected from any one or more of endophytic Bacillus, thermophilic sporothrix, thermophilic Thermus, and thermocellulophilic Clostridium. In a preferred embodiment of the present invention, the thermophilic microbial agent is one or more of endophytic Bacillus and thermophilic sporothrix.

[0031] The total colony count of the thermophilic microbial agent is ≥ 1.2×10 8 CFU / g.

[0032] In the present invention, Bacillus endophyticus was purchased from China Industrial Microbiological Culture Collection Center with a collection number of CICC 10622;

[0033] Sporotrichum thermophilum was purchased from the American Type Culture Collection (ATCC); the accession number is ATCC 36347;

[0034] Thermus thermophilus was purchased from China Industrial Culture Collection Center, with the deposit number CICC 10647; Clostridium thermocellum was purchased from American Type Culture Collection (ATCC), with the deposit number ATCC 27405.

[0035] In the method of the present invention, the dosage of the thermophilic high-temperature microbial agent is 0.5% to 1.5% of the weight of the compost raw material, for example, 0.5% to 0.6%, 0.6% to 0.7%, 0.7% to 0.8%, 0.8% to 0.9%, 0.9% to 1.0%, 1.0% to 1.1%, 1.1% to 1.2%, 1.2% to 1.3%, 1.3% to 1.4% or 1.4% to 1.5%.

[0036] In the method of the present invention, the dry weight mass ratio of the reservoir cyanobacteria to the reed straw is 8:1 to 4:1. For example, 8:1 to 7:1, 7:1 to 6:1, 6:1 to 5:1 or 5:1 to 4:1. In a preferred embodiment of the present invention, the dry weight mass ratio of the reservoir cyanobacteria to the reed straw is 6:1 to 5:1.

[0037] The water content of the cyanobacteria in the reservoir is 50% to 75%, for example, 50% to 55%, 55% to 60%, 60% to 65%, 65% to 70% or 70% to 75%. In a preferred embodiment of the present invention, the water content of the cyanobacteria in the reservoir is 55% to 65%.

[0038] The reed straw is a broken material with a length of ≤1 cm, for example, ≤0.2 cm, 0.2-0.4 cm, 0.4-0.6 cm, 0.6-0.8 cm or 0.8-1 cm.

[0039] In the method of the present invention, the mass ratio of the amount of the composite material to the dry weight of the mixture of reservoir cyanobacteria and reed straw is 0.002:1 to 0.01:1, for example, 0.002:1 to 0.005:1, 0.005:1 to 0.008:1 or 0.008:1 to 0.01:1. In a preferred embodiment of the present invention, the mass ratio of the amount of the composite material to the dry weight of the mixture of reservoir cyanobacteria and reed straw is 0.005:1 to 0.008:1.

[0040] In the method of the present invention, the particle size of the nano zero-valent iron in the composite material is 100-500 nm. For example, it is 100-150 nm, 150-200 nm, 200-250 nm, 250-300 nm, 300-350 nm, 350-400 nm, 400-450 nm or 450-500 nm. In a preferred embodiment of the present invention, the particle size of the nano zero-valent iron in the composite material is 200-400 nm.

[0041] In the method of the present invention, the biochar in the composite material is selected from any one or more of wheat straw biochar, corn straw biochar, rice straw biochar, sorghum stalk biochar, and cotton straw biochar. In a preferred embodiment of the present invention, the biochar in the composite material is selected from any one or more of wheat straw biochar, corn straw biochar, and rice straw biochar.

[0042] The preparation method of biochar is as follows: first, any one or more of wheat straw, corn straw, rice straw, sorghum straw, and cotton straw are dried at 60°C and then ground into 8-20 mm particles; then, the ground straw particles are spread flat in a quartz boat, and then placed in a tube furnace with a heating rate of 5-10°C / min, 5-6°C / min, 6-7°C / min, 7-8°C / min, 8-9°C / min or 9-10°C / min, and maintained at 200-700°C, 200-300°C, 300-400°C, 400-500°C, 500-600°C or 600-700°C in a nitrogen atmosphere for 2-6h, 2-3h, 3-4h, 4-5h or 5-6h, and pyrolysis and carbonization are performed to obtain a biochar sample.

[0043] The mass ratio of nano zero-valent iron to biochar in the composite material is 1:4 to 1:12, for example, 1:4 to 1:5, 1:5 to 1:6, 1:6 to 1:7, 1:7 to 1:8, 1:8 to 1:9, 1:9 to 1:10, 1:10 to 1:11 or 1:11 to 1:12.

[0044] In the method of the present invention, the fermentation time is 20 to 25 days, for example, 20 to 21 days, 21 to 22 days, 22 to 23 days, 23 to 24 days or 24 to 25 days.

[0045] A second aspect of the present invention provides an application of aerobic compost fertilizer of reservoir cyanobacteria and reed straw prepared by the method as described above in promoting plant growth and / or improving soil.

[0046] In the following examples, a windrow composting method was used to build a pile of 5 m long, 3 m wide and 1.5 m high. The compost was actively ventilated by manual turning of the pile, which was turned every 3 days from the date of composting.

[0047] Example 1

[0048] The aerobic composting test was conducted in a sun greenhouse. The mass ratio of reservoir cyanobacteria to reed straw was 5:1, the overall moisture content of the raw materials was adjusted to 60%, and endogenous Bacillus was used for aerobic high-temperature fermentation (the temperature in the sun greenhouse can change naturally, and the amount of bacterial agent added is 1% of the total weight of the raw materials). No exogenous materials were added, and a composting machine was used to turn the compost. The above organic waste was thoroughly decomposed after 35 days of aerobic fermentation treatment. The obtained fertilizer met the organic fertilizer standard (NY 525-2012), and the odor intensity level during the composting process was 4 ("Odor Pollutant Emission Standard" GB / T14544-93).

[0049] Example 2

[0050] Preparation of Nano Zero-Valent Iron / Biochar Composite Materials:

[0051] The biochar was washed twice with deionized water, then washed twice with anhydrous ethanol, dried to constant weight, and then ground and sieved (100-200 mesh). Nano-zero-valent iron / biochar composites can be synthesized by liquid phase reduction method: FeSO4·7H2O (1.24g, 0.62g, 0.413g) and 1g rice straw biochar (1:4; 1:8; 1:12) were dissolved in 200ml ethanol-water (ethanol: water = 1:1, v / v) to prepare nano-zero-valent iron / biochar composites. To ensure that the biochar was in Fe 2+ The solution was evenly distributed. It was first placed in an ultrasonic cleaner for 30 min and stirred at 300 rpm for 60 min. Then 50 ml of NaBH4 reducing agent (1 g of NaBH4 was dissolved in 50 mL of 0.1% NaOH aqueous solution to prepare NaBH4 stock solution) was added to the solution and stirred at 1.5 ml min. -1 The solution was stirred at a flow rate of 100 rpm for 1 hour under strong magnetic stirring (300 rpm) to ensure that the nano-zero-valent iron growth was complete. After the solution was vacuum filtered, the solid particles were washed twice with deoxygenated deionized water, and then washed twice with anhydrous ethanol, and then placed in a vacuum drying oven at 60°C for 24 hours. The obtained nano-zero-valent iron / biochar composite material was stored in a vacuum dryer for use. The nano-zero-valent iron / biochar composite material is as shown in the attached Figure 1 As shown (the mass ratio of nano zero-valent iron to biochar is 1:8).

[0052] Preparation of rice straw biochar: First, the rice straw was dried at 60°C and ground into 8-20 mm particles; then, the ground straw particles were spread flat in a quartz boat, and then placed in a tubular furnace with a heating rate of 5-10°C / min and maintained at 200-700°C in a nitrogen atmosphere for 2-6 h to obtain a biochar sample by pyrolysis and carbonization.

[0053] Example 3

[0054] The aerobic composting test was conducted in a sun greenhouse. The mass ratio of reservoir cyanobacteria to reed straw was 5:1, the original overall moisture content was adjusted to 60%, and endogenous Bacillus was used for aerobic high-temperature fermentation (the dosage of the bacterial agent was 1% of the total weight of the raw material), and nano-zero-valent iron / biochar composite materials were added (the mass ratio of nano-zero-valent iron to biochar was 1:8), the particle size of nano-zero-valent iron was 300nm, and the biochar was rice straw biochar. The mass ratio of the composite material to the dry weight of the cyanobacteria and straw mixture was 0.005:1, and a composting machine was used to turn the compost. The above organic waste was thoroughly decomposed after 25 days of aerobic fermentation treatment, and the obtained fertilizer met the organic fertilizer standard (NY 525-2012), and the odor intensity level during the composting process was 2.5 ("Odor Pollutant Emission Standard" GB / T14544-93).

[0055] Example 4

[0056] The aerobic composting test was conducted in a sun greenhouse. The mass ratio of reservoir cyanobacteria to reed straw was 5:1, the original overall moisture content was adjusted to 60%, and endogenous Bacillus was used for aerobic high-temperature fermentation (the dosage of the bacterial agent was 0.5% to 1.5% of the total weight of the raw materials), and nano-zero-valent iron / biochar composite materials were added (the mass ratio of nano-zero-valent iron to biochar was 1:8), the particle size of nano-zero-valent iron was 300nm, and the biochar was rice straw biochar. The mass ratio of the composite material to the dry weight of cyanobacteria and straw was 0.008:1, and a composting machine was used to turn the compost. The above organic waste was thoroughly decomposed after 22 days of aerobic fermentation treatment, and the obtained fertilizer met the organic fertilizer standard (NY 525-2012), and the odor intensity level during the composting process was 1 ("Odor Pollutant Emission Standard" GB / T14544-93).

[0057] Example 5

[0058] The aerobic composting test was conducted in a sun greenhouse. The mass ratio of reservoir cyanobacteria to reed straw was 5:1, the original overall moisture content was adjusted to 60%, and aerobic high-temperature fermentation was carried out using thermophilic cellulolytic Clostridium (the dosage of the bacterial agent was 1% of the total weight of the raw materials), and nano-zero-valent iron / biochar composite materials were added (the mass ratio of nano-zero-valent iron to biochar was 1:8), the particle size of nano-zero-valent iron was 400nm, and the biochar was rice straw biochar. The mass ratio of the composite material to the dry weight of cyanobacteria and straw was 0.01:1, and a composting machine was used to turn the compost. The above organic waste was thoroughly decomposed after 23 days of aerobic fermentation treatment, and the obtained fertilizer met the organic fertilizer standard (NY 525-2012), and the odor intensity level during the composting process was 1 ("Odor Pollutant Emission Standard" GB / T14544-93).

[0059] Example 6

[0060] The aerobic composting test was conducted in a sun greenhouse. The mass ratio of reservoir cyanobacteria to reed straw was 6:1, and the original overall moisture content was adjusted to 60%. Thermocellulosic Clostridium was used for aerobic high-temperature fermentation (the dosage of the inoculant was 1% of the total weight of the raw materials), and nano-zero-valent iron / biochar composite materials were added (the mass ratio of nano-zero-valent iron to biochar was 1:8). The particle size of nano-zero-valent iron was 400nm, and the biochar was rice straw biochar. The mass ratio of the composite material to the dry weight of cyanobacteria and straw was 0.01:1, and a composting machine was used to turn the compost. The above organic waste was thoroughly decomposed after 23 days of aerobic fermentation treatment. The obtained fertilizer met the organic fertilizer standard (NY 525-2012), and the odor intensity level during the composting process was 2 ("Odor Pollutant Emission Standard" GB / T14544-93).

[0061] Example 7

[0062] The aerobic composting test was conducted in a sun greenhouse. The mass ratio of reservoir cyanobacteria to reed straw was 6:1, and the original overall moisture content was adjusted to 60%. Thermocellulosic Clostridium was used for aerobic high-temperature fermentation (the dosage of the bacterial agent was 1% of the total weight of the raw materials), and nano-zero-valent iron / biochar composite materials were added (the mass ratio of nano-zero-valent iron to biochar was 1:8). The particle size of nano-zero-valent iron was 200nm, and the biochar was rice straw biochar. The mass ratio of the composite material to the dry weight of the cyanobacteria and straw mixture was 0.01:1, and a composting machine was used to turn the compost. The above organic waste was thoroughly decomposed after 22 days of aerobic fermentation treatment. The obtained fertilizer met the organic fertilizer standard (NY 525-2012), and the odor intensity level during the composting process was 1 ("Odor Pollutant Emission Standard" GB / T14544-93)

[0063] In summary, the method of aerobic composting of reservoir cyanobacteria and reed straw of the present invention provides a method for synchronously accelerating the decomposition rate and effectively controlling the odor intensity during the aerobic composting of reservoir cyanobacteria and reed straw: using reservoir cyanobacteria, reed straw, etc. as raw materials, the thermophilic microbial agent is subjected to aerobic composting treatment, and by adding nano zero-valent iron / biochar composite materials, the material is used to accelerate the interspecies electron transfer rate of microorganisms in the aerobic composting system, and the H2S and other malodorous gases released during the composting process are efficiently reduced, and the odor emission intensity is effectively reduced while accelerating the decomposition rate of organic matter during the aerobic composting of organic waste. The method of the present invention not only greatly improves the efficiency of aerobic composting, but also effectively controls the odor intensity, and has good application prospects in environmental governance, comprehensive utilization of waste resources, etc. Therefore, the present invention effectively overcomes the various shortcomings of the prior art and has a high industrial utilization value.

[0064] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A method for aerobic composting of reservoir cyanobacteria and reed straw, characterized in that: The following steps are involved: The raw materials are cyanobacteria from the reservoir and reed straw, which are fermented by thermophilic microorganisms and bacteria, and a composite material of nano zero-valent iron / biochar is added. The raw materials are aerobically fermented until they are mature, and compost fertilizer is obtained.

2. The method for aerobic composting of reservoir cyanobacteria and reed straw according to claim 1, characterized in that: The thermophilic microbial agent is selected from any one or more of endophytic Bacillus, thermophilic sporothrix, thermophilic Thermus, and thermocellulophilic Clostridium; And / or, the total colony count of the thermophilic microbial agent is ≥ 1.2×10 8 CFU / g.

3. The method for aerobic composting of reservoir blue algae and reed straw according to any one of claims 1 to 2, characterized in that: The dosage of the thermophilic high-temperature microbial agent is 0.5% to 1.5% of the weight of the compost raw material.

4. The method for aerobic composting of reservoir cyanobacteria and reed straw according to claim 1, characterized in that: The dry weight ratio of the reservoir blue algae to the reed straw is 8:1 to 4:

1.

5. The method for aerobic composting of reservoir cyanobacteria and reed straw according to claim 4, characterized in that: The water content of the blue algae in the reservoir is 50% to 75%; And / or, the reed straw is in the form of broken pieces with a length of ≤1 cm.

6. The method for aerobic composting of reservoir blue algae and reed straw according to claim 1, characterized in that: The mass ratio of the composite material to the mixed dry weight of reservoir blue algae and reed straw is 0.002:1 to 0.01:

1.

7. The method for aerobic composting of reservoir cyanobacteria and reed straw according to claim 1, characterized in that: The particle size of the nano zero-valent iron in the composite material is 100 to 500 nm; And / or, the biochar in the composite material is selected from any one or more of wheat straw biochar, corn straw biochar, rice straw biochar, sorghum straw biochar, and cotton straw biochar.

8. The method for aerobic composting of reservoir cyanobacteria and reed straw according to claim 7, characterized in that: The mass ratio of nano zero-valent iron to biochar in the composite material is 1:4 to 1:

12.

9. The method for aerobic composting of reservoir blue algae and reed straw according to claim 1, characterized in that: The fermentation time is 20 to 25 days.

10. Use of the reservoir cyanobacteria and reed straw aerobic compost fertilizer prepared according to the method of any one of claims 1 to 9 in promoting plant growth and / or improving soil.

Images