A method for preparing planktonic food through chicken manure fermentation

Abstract

This invention discloses a method for preparing planktonic feed through chicken manure fermentation, belonging to the technical field of livestock and poultry manure resource utilization and aquaculture feed cultivation. This invention uses fresh laying hen manure and wheat straw by-products as raw materials, combined with a highly active compound microbial agent. Through raw material mixing and moisture adjustment, direct-trough high-temperature fermentation, aging and maturation, and crushing and sieving processes, a safe, well-rotted, and nutrient-slow-release aquatic planktonic feed is produced. This invention effectively kills insect eggs and pathogens through high-temperature closed fermentation, effectively solving the problems of oxygen deficiency, water quality exceeding standards, and frequent fish diseases caused by directly introducing fresh chicken manure into the water. It can rapidly cultivate aquatic plankton within 24 hours and is suitable for the aquaculture of filter-feeding fish such as silver carp and bighead carp.

Description

Technical Field

[0001] This invention belongs to the field of livestock and poultry manure resource utilization and aquaculture feed cultivation technology, specifically relating to a method for preparing planktonic feed by fermenting chicken manure. Background Technology

[0002] With the full implementation of policies, natural wild fishery resources have continued to recover, and market consumption has gradually shifted towards artificially farmed aquatic products. Among them, filter-feeding economic fish such as silver carp and bighead carp have seen a significant increase in market demand year by year due to their excellent meat quality and strong adaptability to aquaculture. Plankton is the only core natural food for filter-feeding fish during their growth and reproduction. The abundance, activity, and stability of plankton populations in water bodies directly determine the production capacity, quality, and overall economic benefits of large-scale aquaculture, and are the core key to improving the quality and efficiency of ecological aquaculture.

[0003] Currently, the mainstream methods for fertilizing water and cultivating plankton in aquaculture still rely primarily on traditional farmyard manure, chemical fertilizers, and simple fermented materials. These inputs lack unified production and application standards, and generally suffer from insufficient safety, poor stability, and failure to meet environmental standards. While fresh chicken manure is a high-quality fertilizer due to its abundant nutrients and low cost, it is strictly prohibited from being directly added to water. Fresh chicken manure carries a large number of pathogens, parasite eggs, and harmful microorganisms; direct introduction into water can easily induce large-scale fish diseases and cause biological pollution of the aquatic body. Furthermore, fresh chicken manure decomposes rapidly in the water anaerobicly, drastically consuming dissolved oxygen, which can easily lead to fish surfacing due to oxygen deficiency, and even fish deaths. The decomposition process also causes a sharp rise in toxic indicators such as ammonia nitrogen and nitrite, disrupting the aquatic ecological balance, causing water quality deterioration, and drastically increasing aquaculture risks.

[0004] Currently, conventional chicken manure fermentation processes are suitable for agricultural organic fertilizer preparation but cannot meet the specific needs of aquaculture for targeted insect cultivation, exhibiting significant technical deficiencies. Traditional fermentation processes generally suffer from lengthy fermentation cycles and slow release of organic nutrients, failing to achieve rapid propagation and cultivation of plankton, and thus failing to meet the time-sensitive requirements of aquaculture. Furthermore, the simple natural composting method results in incomplete decomposition, leaving harmful bacteria and impurities in the material, posing a continuous risk of water pollution. Simultaneously, existing fermentation technologies often use wheat straw by-products as auxiliary materials and low-activity general-purpose microbial agents, combined with natural composting, lacking core processes such as precise high-temperature control in direct-trough fermentation, standardized fixed turning intervals, and standardized aging and maturation. This ultimately leads to insufficient material decomposition, low activity of functional microorganisms, and disordered nutrient release. Currently, there is no dedicated chicken manure fermentation process in the industry specifically designed for aquatic plankton cultivation, failing to address the multiple aquaculture needs of rapid insect cultivation, thorough decomposition, water safety, and environmental compliance, severely hindering the coordinated and high-quality development of livestock and poultry manure resource recycling and ecologically healthy aquaculture. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a method for preparing planktonic feed through chicken manure fermentation. This method aims to abandon the traditional extensive aquaculture approach of directly adding fresh chicken manure into the water. Using fresh laying hen manure as the main ingredient and wheat straw by-products as the sole straw supplement, along with a composting agent, a standardized process involving direct-trough high-temperature controlled fermentation, aging, and crushing and screening, the chicken manure undergoes thorough and harmless composting. This process produces a specialized nutrient-rich feed suitable for the growth of planktonic organisms in the water, thereby achieving closed-loop resource utilization of livestock and poultry manure. It solves the technical problem of traditional processes being unable to quickly and safely cultivate planktonic organisms, and meets the needs of large-scale ecological aquaculture production of filter-feeding fish such as silver carp and bighead carp.

[0006] To achieve its objectives, the present invention employs the following technical solution: A method for preparing planktonic food through chicken manure fermentation includes the following steps: Step 1: Mixing raw materials and adjusting moisture content Mix the composting agent with wheat straw shredding waste at a mass ratio of 1:10 to obtain a compound microbial agent; Fresh hen manure, wheat straw shredding waste, and compound microbial agent are sequentially fed into the mixing equipment via a feeding conveyor belt. The feeding time is controlled at 30-50 minutes. After feeding, the mixture is continuously stirred for 50-70 minutes to obtain a mixture. The mass percentage of fresh hen manure to wheat straw shredding waste is 65%-75%: 25%-35%. The compound microbial agent is added quantitatively at a standard rate of 2.5-3.0 kg per ton of fresh hen manure. Adjust the moisture content of the mixture to 55%–65% to obtain the material to be fermented.

[0007] As a preferred option: fresh laying hen manure refers to fresh laying hen manure transported on the same day, with a moisture content controlled at 80% to 85%, a dry basis organic matter content of 15% to 20%, free from mold and antibiotic residues, and the mixing process of materials to be fermented is completed on the same day.

[0008] As a preferred option: only wheat straw shredding by-products produced after shredding are selected, with a moisture content ≤15%, dry basis organic matter content ≥50%, dry basis soil content of 10%~15%, no wood ash, which can effectively adjust the carbon-nitrogen ratio of the material, and has the characteristics of strong water absorption, good compatibility with chicken manure, and fast decomposition speed.

[0009] Preferably, the composting agent is a compound microbial agent containing Bacillus subtilis and Aspergillus oryzae, with a total effective viable count ≥1.0×10⁻⁶. 10 CFU / g, specifically, an organic material composting agent can be selected.

[0010] As a preferred option: adjust the moisture content of the mixture by adding wheat straw shredding waste and / or spraying clean water: when the moisture content of the mixture is higher than 65%, add dry wheat straw shredding waste to reduce the moisture; when the moisture content is lower than 55%, spray clean water evenly to increase the moisture.

[0011] As a preferred option, after the composting agent is compounded with wheat straw shredding waste, it should be used in the mixing process of the materials to be fermented within 48 hours to avoid the compounded microbial agent being stored for too long, which would lead to the decline of microbial activity and affect the composting effect.

[0012] Step 2: Straight-trough high-temperature fermentation The material to be fermented is fed into a straight-trough fermentation device equipped with a temperature control system, and the pile height is controlled at 1.8-2.2m. The total fermentation cycle is 18-24 days: 1-3 days before fermentation, the temperature is raised to 60℃-65℃ by the temperature control system and maintained at a constant temperature for 3-5 days; after the constant temperature stage, the auxiliary heating is turned off and the material cools down naturally; the turning interval is set at 3-4 days throughout the fermentation process, with a total of 6 turnings; the closed high-temperature environment of the straight-trough promotes rapid heating of the material and full decomposition of organic matter, ensuring that the material is thoroughly decomposed and completely harmless.

[0013] Step 3: Aging and composting After fermentation, the semi-finished material is transferred to an aging warehouse for aging treatment. The aging period is 30 days, with the material being turned over every 10 days (i.e., a total of three times) to promote secondary maturation of the incompletely decomposed material and allow the material to naturally lose moisture. After aging, the material is left to stand for 12 to 18 days to obtain fully decomposed material.

[0014] Material composting qualification standard: The material has no foul odor, its appearance is brown to dark brown, the temperature of the pile drops to room temperature, the texture is loose and without lumps, and the seed germination index GI≥70%.

[0015] Step 4: Crushing and sieving The composted material is fed into a vertical crusher for impact crushing. After crushing, the particle size of the material is ≤3mm. Then, it is screened through a 3mm aperture drum screen to remove large particles that are not thoroughly crushed or do not meet the size requirements. The large particles on the screen are returned to participate in fermentation again, and the material under the screen is the finished planktonic food. The moisture content of the finished product is controlled at 22% to 30%.

[0016] The present invention further provides a method for applying the prepared planktonic food, specifically: when applying, according to the dosage standard of 30 kg / mu·m water depth, it is evenly scattered throughout the pond on sunny nights from March to September each year, which can quickly cultivate planktonic organisms in the water and provide high-quality natural food for filter-feeding fish such as silver carp and bighead carp.

[0017] The finished product obtained by this invention is a special nutrient feed for plankton and cannot be directly used as fish feed. It is suitable for various large-scale aquaculture scenarios such as ponds, reservoirs, and artificial lakes.

[0018] The beneficial effects of this invention are reflected in: 1. This invention uses fresh hen manure as the main raw material, combined with wheat straw shredding by-products and organic material composting agents. It integrates a direct-trough high-temperature controlled fermentation, standardized aging, and crushing and screening process to achieve full material composting and stable, slow-release of nutrients. This allows for the rapid cultivation of plankton in the water, providing natural food for filter-feeding fish such as silver carp and bighead carp. This invention constructs a closed-loop resource utilization model of "livestock manure—plankton food—fish farming." Leveraging the advantages of multi-enzyme synergistic high-temperature composting, it can rapidly cultivate zooplankton within 24 hours, significantly increasing plankton biomass. It features safety, compliance, stable nutrients, and low cost, effectively solving problems such as delayed insect cultivation and water quality exceeding standards in traditional aquaculture. It is suitable for large-scale ecological aquaculture of filter-feeding fish, promoting the coordinated development of manure resource utilization and aquaculture.

[0019] 2. This invention eliminates the risk of directly introducing fresh chicken manure into water bodies at the source. The high-temperature fermentation process effectively kills pathogens and parasite eggs, with a roundworm egg mortality rate of up to 96%. There is no harmful biological pollution, ensuring excellent safety for aquaculture. Furthermore, the product releases nutrients gently, without excessively consuming dissolved oxygen in the water or causing abnormalities in indicators such as ammonia nitrogen, thus providing outstanding water quality assurance.

[0020] 3. Compared with traditional materials and processes, this invention achieves efficient resource utilization of chicken manure and wheat straw shredding by-products, reducing overall production costs by 20%, shortening the fermentation cycle by 5-7 days, resulting in significant cost reduction and efficiency improvement, and meeting environmental protection requirements throughout the entire process.

[0021] 4. According to the NY / T525-2021 standard for organic fertilizers, all indicators of the finished product of this invention meet the standards: the dry basis organic matter content is 32.3%, the nitrogen, phosphorus pentoxide, and potassium oxide contents are 1.9%, 2.6%, and 2.1% respectively, and the total nutrients meet the standard requirements; the pH value is 8.3, the moisture content is 22.6%, the seed germination index (GI) is 76%, reaching the standard of complete decomposition, and the mechanical impurity ratio is 0.2%. Regarding heavy metals, the total arsenic content is 0.8 mg / kg, the total lead content is 14.6 mg / kg, the total mercury content is 0.1 mg / kg, and the total chromium content is 18.0 mg / kg, all of which are far below the standard limits; the fecal coliform count is ≤100 CFU / g, and the product has no antibiotic or pathogenic bacteria residues, demonstrating excellent overall quality. Attached Figure Description

[0022] Figure 1 This is a process flow diagram of the preparation of planktonic food by chicken manure fermentation according to the present invention. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to specific embodiments. These embodiments are only used to explain the present invention and do not limit the scope of protection of the present invention.

[0024] The following examples and comparative experiments on aquatic application were conducted only in standardized small experimental ponds. The experimental ponds were equipped with real-time water quality monitoring and regular water exchange and control systems to regulate and control the total amount of application and the aquatic environment, and the entire process would not cause continuous water pollution.

[0025] Example 1 In this embodiment: The composting agent selected is a powdered organic material composting agent from Shandong Xingwei Microbial Technology Co., Ltd., containing beneficial microorganisms such as Bacillus subtilis, Bacillus licheniformis, Bacillus amyloliquefaciens, baker's yeast, Aspergillus niger, Aspergillus oryzae, and actinomycetes, as well as their metabolites and carriers, with a total effective viable count ≥1.0×10⁻⁶. 10 cfu / g, cellulase activity ≥100U / g, protease activity ≥100U / g, xylanase activity ≥100U / g, pectinase activity ≥100U / g.

[0026] The fresh hen manure was transported from Fuyang Gold Medal Chicken Farm on the same day. It had a moisture content of 83%, a dry basis organic matter content of 16%, and was free of mold and antibiotic residues. The mixing process of the materials to be fermented was completed on the same day.

[0027] The wheat straw shredding waste has a moisture content of 10%, a dry basis organic matter content of 55%, a dry basis soil content of 12%, and does not contain wood ash.

[0028] This embodiment provides a method for preparing planktonic food through chicken manure fermentation, and the specific process steps are as follows: Step 1: Mixing raw materials and adjusting moisture content The composting agent and wheat straw shredding waste are mixed and stirred evenly at a mass ratio of 1:10 to prepare a compound microbial agent. The compound agent should be put into use in the production line within 24 hours after preparation to avoid the decline of microbial activity.

[0029] Fresh hen manure, wheat straw shredded waste, and compound microbial agent are sequentially fed into the mixing equipment via a feeding conveyor belt. The feeding time is controlled at 40 minutes. After feeding, the mixture is continuously stirred for 60 minutes to obtain a mixture. The mass percentage of fresh hen manure to wheat straw shredded waste is 70:30. The compound microbial agent is added quantitatively at a standard rate of 2.8 kg per ton of fresh hen manure.

[0030] On-site testing showed that the moisture content of the mixture was within the process control range of 55% to 65%, requiring no additional water or straw, and it could be used directly as the material to be fermented.

[0031] Step 2: Straight-trough high-temperature fermentation The material to be fermented is fed into a straight-channel fermentation unit equipped with a temperature control system. The total capacity of the unit is 3000 m³. 3 The amount of material produced in a single batch is 120-150m³. 3 After manual leveling, the height of the material pile is uniformly controlled at 2m; the total fermentation cycle is 24 days: for the first 2 days of fermentation, the temperature is raised to 60℃~65℃ using a temperature control system and maintained at a constant temperature for 3 days; after the constant temperature stage, the auxiliary heating is turned off, and the material cools down naturally; the turning interval is set at 4 days throughout the fermentation process, with a total of 6 turnings. The closed high-temperature environment is used to fully degrade organic matter, kill insect eggs and pathogens, and complete the initial harmless treatment of the material.

[0032] Step 3: Aging and composting After fermentation, the semi-finished material is transferred to a ventilated aging warehouse for aging treatment. The aging period is 30 days, with mechanical turning every 10 days. After aging, the material is left to stand for 15 days to complete secondary composting, natural precipitation, and material homogenization. In this embodiment, all materials meet the qualified composting standards after standing.

[0033] Step 4: Crushing and sieving The decomposed material is fed into a vertical crusher for impact crushing. After crushing, the particle size of the material is ≤3mm. Then, it is conveyed to a 3mm aperture drum screen for sieving. The large particles that clump on the screen are collected and returned to the straight-channel fermentation equipment for re-fermentation. The fine powder that passes through the screen is the planktonic food product of this embodiment. The actual measured moisture content of the finished product is 22.6%, which meets the limit of no more than 30% moisture content specified in the NY / T525-2021 "Organic Fertilizer" standard. No additional water adjustment is required.

[0034] According to the test results, the dry basis organic matter content of the finished product in this embodiment is 32.3%, the seed germination index GI=76, the ascarid egg mortality rate is 96%, and all heavy metal and microbial indicators meet the NY / T525-2021 "Organic Fertilizer" standard.

[0035] Application method: Apply 30 kg / mu·meter water depth evenly throughout the pond on sunny nights from March to September each year. Within 24 hours after application, the density of plankton in the water will be significantly increased, the feeding activity of silver carp and bighead carp will be excellent, and the aquaculture water quality will be safe with no risk of deterioration.

[0036] Comparative Example 1 The difference between this comparative example and Example 1 is that conventional open-air windrow composting is used without the addition of commercial composting agents. The specific steps are as follows: Step 1: Mixing raw materials and adjusting moisture content The process of premixing composting agents with wheat straw to prepare compound microbial agents is not carried out. Instead, fresh hen manure and wheat straw shredding waste are sequentially fed into the mixing equipment via a conveyor belt. The feeding time is controlled at 40 minutes, and after feeding, mixing and stirring are continued for 60 minutes to obtain a mixture. The mass percentage of fresh hen manure to wheat straw shredding waste is 70%:30%. On-site testing shows that the moisture content of the mixture is within the process control range of 55% to 65%, requiring no additional spraying of water or addition of straw to adjust the moisture content. It can be directly used as the material to be fermented.

[0037] Step 2: Open-air windrow fermentation The materials to be fermented were transferred to an open-air dedicated composting site and manually piled into windrows. After being leveled manually, the height of the piles was uniformly controlled at 2m. The entire fermentation process did not have a closed straight trough equipment or a supporting temperature control system. Following the conventional management method of open-air composting, a simple manual turning operation was carried out once every 7 days. The total fermentation time of the materials was 24 days, and the materials were manually turned 3 times throughout the process. The entire fermentation stage could not maintain a stable high temperature range of 60℃~65℃, which could not fully kill insect eggs and pathogens.

[0038] Step 3, Aging and Maturation: Consistent with Example 1.

[0039] Step 4, crushing and sieving: consistent with Example 1.

[0040] Experimental results: The degree of natural fermentation and decomposition was extremely low, with a material GI < 55%, failing to meet the decomposition standard; the finished product moisture content was 38.2%, far exceeding the designed moisture content range of 25%–30%, and also exceeding the standard limit of NY / T525-2021 for moisture ≤ 30%; the mortality rate of ascarid eggs was less than 65%, and the fecal coliform count was severely excessive. After application to aquaculture water, it takes more than 96 hours to observe planktonic proliferation. The material consumes oxygen drastically after entering the water, easily causing a surge in ammonia nitrogen, posing a significant risk to aquaculture safety.

[0041] Comparative Example 2 The method for preparing planktonic food by fermenting chicken manure provided in this comparative example is basically the same as that in Example 1, except that in step 1, the composting agent is not premixed with wheat straw shredding waste to form a compound microbial agent, and the composting agent is directly added at a standard of 2.8 kg per ton of fresh chicken manure.

[0042] Experimental results: The lack of premixing and activation of the microbial agent resulted in poor dispersion uniformity, leading to insufficient local composting of the material. The seed germination index (GI) was 68%, failing to meet the standard for complete composting. The effect after application to the water was slow, requiring 72 hours to observe significant phytoplankton proliferation. The distribution of phytoplankton throughout the pond was uneven, and the stability of the insect cultivation was significantly reduced.

[0043] Comparative Example 3 The method for preparing planktonic food by fermenting chicken manure provided in this comparative example is basically the same as that in Example 1, except that: in the fermentation process of step 2, no temperature control system is used for heating, and the fermentation temperature of 60℃~65℃ is maintained for only 2 days in the early stage of fermentation, relying on the endogenous heat generation of the material.

[0044] Experimental results: Insufficient high-temperature composting resulted in incomplete inactivation of insect eggs and pathogens, with a roundworm egg mortality rate of only 82%. The detected level of fecal coliforms was high, failing to meet harmlessness standards. The material's GI was 67%, indicating incomplete composting. The incubation of insects in water was slow to take effect, requiring 68 hours for significant phytoplankton proliferation to occur, making the aquaculture application effect far inferior to Example 1.

[0045] Comparative Example 4 The method for preparing planktonic food by fermenting chicken manure provided in this comparative example is basically the same as that in Example 1, except that: after the high-temperature fermentation in step 2, the crushing and screening in step 4 is carried out directly, without the aging and composting in step 3.

[0046] Experimental results: Due to the lack of post-fermentation maturation and natural precipitation, the organic matter decomposition of the material was insufficient, with a GI of 66%, indicating substandard maturation. The finished product had a moisture content of 36.7%, exceeding the moisture limit of the NY / T525-2021 national standard. Nutrient release from the material was uneven, resulting in poor sustainability of insect cultivation in water and an inability to sustainably cultivate planktonic populations for a long period.

[0047] Comparative Example 5 The method for preparing planktonic feed by fermenting chicken manure provided in this comparative example is basically the same as that in Example 1, except that after impact crushing in step 4, no sieving or coarse particle back-fermentation process is performed, and it is directly used as the finished product.

[0048] Test results: The finished product had uneven particle size and high impurity content, with mechanical impurities exceeding the standard by 0.65%. Plankton proliferation only occurred in localized areas 48 hours after application to the water body; the uniformity of insect cultivation throughout the pond was poor, and the overall cultivation effect was unstable, failing to meet the needs of balanced fertilization and insect cultivation in large water bodies.

[0049] Comparative Example 6 This comparative example adopts the industry-standard complete production process for agricultural organic fertilizer. The raw material system, type of composting agent, fermentation equipment, temperature-controlled turning and turning system, aging process, and post-screening process all differ significantly from Example 1. No targeted process optimization was performed to meet the needs of aquaculture plankton cultivation. Fresh laying hen manure was selected from the same batch as in the example. The auxiliary material was replaced with 3cm long ordinary crushed wheat straw, instead of wheat straw shredding waste. The auxiliary material had a moisture content of 12%, an organic matter content of 52%, a soil content of 12%, and did not contain wood ash. The composting agent was replaced with an organic material composting agent from Baoding Ruigu Biotechnology Co., Ltd., which contains Bacillus subtilis, Aspergillus oryzae, beneficial microorganisms, their metabolites, and carriers, with a total effective viable count of 2.511 × 10⁻⁶.10 The cellulase activity was 1600.3 U / g, and the protease activity was 342.9 U / g. The bacterial strain composition differed from the bacterial agent used in the examples.

[0050] Step 1: Mixing raw materials Instead of performing the pre-mixing process of composting agent and straw to prepare compound microbial agent, the composting agent is directly fed into the feed along with chicken manure and ordinary straw. The ratio of fresh laying hen manure to ordinary crushed wheat straw is 90%:10%, which is a high chicken manure and low straw ratio. The composting agent is added quantitatively at 0.02% of the total mass of all materials. All raw materials are fed into the mixing machine by conveyor belt and fully mixed. The moisture content of the mixture is adjusted to 60% by spraying clean water to prepare the material to be fermented.

[0051] Step 2: Heating, fermentation, and turning to ripen The material to be fermented is first fed into 20m 3 The material was preheated briefly using a simple, harmless treatment device before being transferred to a circular fermentation tank for primary fermentation. The circular fermentation tank had a material pile height of 1.55m and a tank width of 4.65m. The entire fermentation system lacked a temperature control system and a standardized 4-day fixed turning interval. Turning operations were flexibly arranged based on the dryness and wetness of the material. The total composting period was 26 days, longer than the 24-day fermentation period in Example 1. After the fermentation process was completed, the measured moisture content of the semi-finished product was 37%.

[0052] Step 3: Aging treatment After fermentation, the semi-finished material is transferred to a ventilated aging warehouse for aging treatment. The aging period is 30 days, and the material is mechanically turned over once every 10 days. The difference from the process in Example 1 is that the 15-day material static homogenization process is omitted after the aging period, and there is no secondary homogenization or natural precipitation process.

[0053] Step 4: Crushing and sieving the finished product After aging, the material is fed into a vertical crusher for impact crushing. The crushed material has a particle size of ≤3mm. It is not equipped with a 3mm aperture drum screen for screening. The material without large lumps is returned to the fermentation tank for re-fermentation in a cycle process. The crushed material is discharged directly as a conventional agricultural organic fertilizer product.

[0054] Experimental results: The germination index (GI) of the finished seeds in this comparative example was 68%, which did not meet the standard of GI≥70 for complete decomposition; the pH of the finished product was 9.3, exceeding the standard range of 5.5–9.0. Referring to the example, using the same dosage of 30 kg / mu·meter water depth and applying it to the entire pond at night on sunny days from March to September, it took more than 72 hours for significant phytoplankton proliferation to occur. The onset of phytoplankton cultivation was significantly slower than in Example 1, and the uniformity of phytoplankton distribution throughout the pond was poor.

[0055] The test results of the finished products obtained in each embodiment and comparative example are shown in Tables 1 to 3.

[0056] Table 1. Results of tests on decomposition degree, hygiene, and plankton cultivation effect

[0057] Table 2. Results of Physicochemical Property Tests

[0058] Table 3. Results of Heavy Metal Content Detection

[0059] The above are merely exemplary embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any equivalent substitutions, simple modifications, parameter adjustments, and improvements made within the concept and technical principles of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for preparing planktonic food through chicken manure fermentation, characterized in that, Includes the following steps: Step 1: Mixing raw materials and adjusting moisture content Mix the composting agent with wheat straw shredding waste at a mass ratio of 1:10 to obtain a compound microbial agent; Fresh hen manure, wheat straw shredding waste, and compound microbial agent are sequentially fed into the mixing equipment via a feeding conveyor belt. The feeding time is controlled at 30-50 minutes. After feeding, the mixture is continuously stirred for 50-70 minutes to obtain a mixture. The mass percentage of fresh hen manure to wheat straw shredding waste is 65%-75%: 25%-35%. The compound microbial agent is added quantitatively at a standard rate of 2.5-3.0 kg per ton of fresh hen manure. Adjust the moisture content of the mixture to 55%–65% to obtain the material to be fermented; Step 2: Straight-channel high-temperature fermentation The material to be fermented is fed into a straight-trough fermentation equipment equipped with a temperature control system, and the pile height is controlled at 1.8-2.2m. The total fermentation cycle is 18-24 days: 1-3 days before fermentation, the temperature is raised to 60℃-65℃ by the temperature control system and maintained at a constant temperature for 3-5 days; after the constant temperature stage, the auxiliary heating is turned off and the material is allowed to cool down naturally; the turning interval is set at 3-4 days throughout the fermentation process, with a total of 6 turnings. Step 3: Aging and composting After fermentation, the semi-finished material is transferred to an aging warehouse for aging treatment. The aging period is 30 days, and the material is turned over every 10 days to promote secondary decomposition and natural precipitation. After aging, the material is left to stand for 12 to 18 days to obtain the decomposed material. Step 4: Crushing and sieving The decomposed material is fed into a vertical crusher for impact crushing until the particle size is ≤3mm, and then screened through a 3mm aperture drum screen. Large particles on the screen are returned for re-fermentation, and the material below the screen is the finished planktonic food product. The moisture content of the finished product is controlled at 22% to 30%.

2. The method for preparing planktonic food through chicken manure fermentation according to claim 1, characterized in that: In step 1, the fresh laying hen manure refers to fresh laying hen manure collected on the same day, with a moisture content of 80% to 85% and a dry basis organic matter content of 15% to 20%.

3. The method for preparing planktonic food through chicken manure fermentation according to claim 1, characterized in that: In step 1, the moisture content of the wheat straw shredding waste is ≤15%, the dry basis organic matter content is ≥50%, and the dry basis soil content is 10% to 15%.

4. The method for preparing planktonic food through chicken manure fermentation according to claim 1, characterized in that: In step 1, the composting agent is a compound microbial agent containing Bacillus subtilis and Aspergillus oryzae, with a total effective viable count ≥ 1.0 × 10⁻⁶. 10 cfu / g.

5. The method for preparing planktonic food through chicken manure fermentation according to claim 1, characterized in that: In step 1, the moisture content of the mixture is adjusted by adding wheat straw shredding waste and / or spraying clean water.

6. The method for preparing planktonic food through chicken manure fermentation according to claim 1, characterized in that: In step 3, the decomposed material meets the requirement of seed germination index (GI) ≥ 70%.

7. A planktonic food prepared by the method according to any one of claims 1 to 6.

8. A method for applying the planktonic food according to claim 7, characterized in that: When applying, use 30 kg / mu·meter water depth and evenly spread it throughout the pond on sunny nights from March to September each year for the targeted cultivation of plankton.

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