Process method for converting mariculture filter residues into feed

Abstract

The invention discloses a process method for converting mariculture filter residues into feed, which comprises the following steps: mixing mariculture filter residues with other low-value aquatic products or food processing byproducts according to the ratio of 1: 0.5-1: 2, and adjusting the raw material ratio according to the nutritional requirements of cultured organisms, so that the protein content of the mixed raw material mixture is greater than or equal to 10.3% to form a to-be-treated material; carrying out pre-crushing treatment on the to-be-treated material to enable the particle size of the material to be less than or equal to 2mm; sodium carboxymethyl cellulose and guar gum are added into the crushed materials to serve as suspending agents, the total concentration of the suspending agents is 0.3%, and the materials are stirred and mixed evenly. Efficient and low-consumption production is achieved through innovation of the dosage form, liquid feed is directly prepared through the suspension dosage form by means of the high water content characteristic of the mariculture filter residues, the drying and dewatering steps are not needed, and the cost is low. Equipment investment and energy consumption are saved from the source, and the problems of protein denaturation and energy waste caused by drying of traditional powdery feed are solved. The liquid form enables the feed to be uniformly dispersed in water.

Description

Technical Field

[0001] The present invention belongs to the technical field of mariculture, and particularly relates to a process method for converting seawater aquaculture filter residues into feed. Background Art

[0002] While the mariculture industry creates huge economic value, it also generates a large amount of solid waste. Among them, the annual output of seawater aquaculture filter residues has reached tens of millions of tons. These filter residues are rich in 10%-11% protein and have the potential for resource utilization as secondary feed. Therefore, traditional technologies mainly reuse them after composting fermentation or high-temperature sterilization treatment. Specifically, the composting method degrades organic matter and sterilizes through natural fermentation, which takes several weeks and involves turning the pile operation; high-temperature sterilization relies on heating at above 120°C for more than 30 minutes. Both methods require subsequent drying and pulverization to make powdered feed. In addition, when using a single suspending agent such as sodium carboxymethylcellulose to prepare liquid feed in the prior art, there are problems of insufficient suspension stability or too high viscosity, and there is less research on the synergistic utilization of multiple raw materials such as small fish and shellfish waste. Traditional treatment methods have significant defects: Composting fermentation is greatly affected by environmental temperature and humidity, with a cycle as long as 48 days. Moreover, the high salt content of the filter residues is likely to inhibit the activity of the bacterial community, resulting in incomplete sterilization and protein degradation (the protein content of the finished product is only 8%-9%). At the same time, random landfill is likely to cause soil salinization; Although high-temperature sterilization shortens the cycle, high temperature causes protein structure damage, low nutrient retention rate, and extremely high energy consumption in the drying link. For every 100 kg of materials, the power consumption reaches more than 30 kWh. In terms of dosage form preparation, powdered feed relies on drying and dehydration, with a complex process and high cost; The liquid feed with a single suspending agent has poor suspension stability and is prone to sedimentation and stratification after standing, unable to meet the long-term feeding requirements. In addition, the prior art has insufficient optimization of the synergistic formula for multiple low-value raw materials, and it is difficult to accurately adjust the feed structure according to the nutritional requirements of different aquaculture organisms such as fish, shrimp, and crabs, which limits the efficient resource utilization of mariculture solid waste. Therefore, a process method for converting seawater aquaculture filter residues into feed is proposed. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a process method for converting seawater aquaculture filter residues into feed, which solves the problems of low sterilization efficiency, nutrient loss, high energy consumption, and single formula in the treatment of seawater aquaculture filter residues in the prior art.

[0004] To achieve the above object, the present invention provides the following technical solutions: A process method for converting seawater aquaculture filter residues into feed, comprising the following steps: S1: Mix the seawater aquaculture filter residue with other low-value aquatic products or food processing by-products at a weight ratio of 1:0.5 - 1:2. Adjust the raw material ratio according to the nutritional requirements of the cultured organisms to make the protein content of the mixed raw material mixture ≥ 10.3%, forming the material to be processed. S2: Perform pre-crushing treatment on the material to be processed to make the particle size of the material ≤ 2 mm. S3: Add sodium carboxymethylcellulose and guar gum (compounding ratio 1:1) as suspending agents to the crushed material. The total concentration of the suspending agents is 0.3%, and stir and mix evenly. S4: Process the mixed material using high-pressure homogenization technology. Control the homogenization pressure at 1000 - 1200 bar and the flow rate at 180 - 220 L / h to break the cell walls of pathogenic bacteria and inactivate them, and make the liquid protein evenly dispersed. S5: Perform cooling treatment on the homogenized material. Control the discharge temperature ≤ 25 °C to obtain a compound liquid feed suspension with a protein content ≥ 10.9% and a sedimentation rate ≤ 5% after standing for 24 h.

[0005] Preferably, the other low-value aquatic products include small fish and shrimp and crab offcuts, and the food processing by-products include seaweed residue and shellfish processing waste.

[0006] Preferably, the mixing process in step S1 is carried out in a stirring device, with a stirring speed of 100 - 300 revolutions per minute and a stirring time of 10 - 30 minutes.

[0007] Preferably, the high-pressure homogenization treatment in step S4 inactivates the pathogenic bacteria in the compound liquid feed with an inactivation rate ≥ 99% and the total number of colonies ≤ 1000 CFU / g.

[0008] Preferably, the compound liquid feed meets the nutritional requirements of different cultured organisms such as fish, shrimp, and crab by adjusting the raw material ratio.

[0009] Preferably, the suspending system formed by the compounding of sodium carboxymethylcellulose and guar gum improves the stability of the suspension through synergistic effects and avoids the aggregation and sedimentation of protein particles.

[0010] Preferably, the cooling treatment in step S5 uses a plate heat exchanger or a spiral cooling device, and the cooling medium is circulating cooling water or a mixture of ice and water.

[0011] Preferably, the moisture content of the seawater aquaculture filter residue is 60% - 80%, and no drying and dehydration treatment is required before mixing.

[0012] Preferably, the high-pressure homogenization equipment uses a piston-type homogenizer, and the material of the homogenization valve assembly is tungsten carbide or zirconia to ensure wear resistance under high-pressure environments.

[0013] Preferably, the pH value of the composite liquid feed is controlled within the range of 6.5 - 7.5 to avoid adverse stimuli during feeding of the cultured organisms.

[0014] Technical effects and advantages of the process method for converting seawater aquaculture filter residues into feed according to the present invention: 1. In this invention, the innovative dosage form enables efficient and low-consumption production. Relying on the high water content characteristics of seawater aquaculture filter residues, a suspension dosage form is directly used to prepare liquid feed without the drying and dehydration steps, saving equipment investment and energy consumption from the source, and solving the problems of protein denaturation and energy consumption waste caused by drying in traditional powdered feed. The liquid form allows the feed to be evenly dispersed in water, avoiding waste and pollution caused by particle sedimentation, better conforming to the feeding habits of aquatic organisms, and improving the feed utilization efficiency.

[0015] 2. In this invention, the high-pressure homogenization technology innovates sterilization and nutrient retention. Through high-pressure homogenization treatment at 1000 - 1200 bar, efficient inactivation of pathogenic bacteria is achieved at room temperature, completely solving the problem of inhibiting bacterial fermentation in a high-salt environment. Compared with traditional composting and high-temperature sterilization, it avoids the protein structure damage caused by high temperature and retains the nutrients to the greatest extent. At the same time, the single-batch processing time is short, and the entire process cycle is greatly shortened, providing feasibility for industrial continuous production.

[0016] 3. In this invention, the compounding of suspending agents optimizes the suspension performance. Sodium carboxymethylcellulose and guar gum are compounded at a ratio of 1:1 and the concentration is controlled at 0.3%. Through their synergistic effect, a stable spatial network structure is formed, taking into account both the stability and fluidity of the suspension, effectively preventing the aggregation of protein particles, and avoiding the problems of excessive viscosity or insufficient stability of a single suspending agent, providing guarantee for uniform feeding of the feed and its dispersion in water.

[0017] 4. In this invention, the synergistic effect of multiple raw materials improves resource utilization and economy. By integrating seawater aquaculture filter residues with various low-value aquatic products and food processing by-products, and optimizing the nutritional structure by adjusting the formula, high-value utilization of "using waste to supplement waste" is achieved, reducing the dependence on traditional high-quality protein sources, significantly reducing the cost of aquaculture raw materials, and promoting resource recycling and cost optimization in the aquaculture industry chain.

[0018] 5. In this invention, the technical system constructs dual values of environmental protection and industry. Through the technical framework of "dosage form optimization - sterilization upgrade - suspension innovation - raw material expansion", a highly efficient utilization system for seawater aquaculture solid waste resources is constructed, cutting off the harm of high-salt waste to the ecological environment from the source, avoiding soil salinization caused by composting and landfill and exhaust gas emissions from high-temperature sterilization, and having both environmental protection benefits of "reduction, harmlessness, and resource utilization" and industrial application values of "efficient production - high-quality products", conforming to the global trend of green aquaculture development. Description of the Drawings

[0019] Figure 1It is the process flow diagram of a process method for converting filter residues in seawater aquaculture into feed proposed by the present invention. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, the elements defined by the statement "including..." do not exclude the existence of additional identical elements in the process, method, article or device including the said elements. Refer to Figure 1 , the present invention provides a process method for converting filter residues in seawater aquaculture into feed. Through the synergistic action of the covalent anchoring technology of the microorganism-responsive degradation promoter, the microencapsulation process of microecological factors, and the photo-bio dual-trigger surface functionalization modification, the efficient degradation of materials in the household composting environment (50±5°C, pH 6.5 - 7.5, humidity 70% - 80%) is achieved. In the following examples, polylactic acid (PLA) is a commercially available food-grade material, and the microorganism-responsive degradation promoter, microecological factors, and photosensitive group precursors are all commercially available or synthesized by conventional methods. The process steps without specific conditions are all conventional techniques in the art. Embodiment

[0021] Refer to Figure 1 , this embodiment provides a process method for converting filter residues in seawater aquaculture into feed for the implementation of basic process verification (compound liquid feed for fish). The specific implementation content includes: Purpose of implementation: Verify the influence of the core parameters (suspending agent concentration 0.3%, homogenization pressure 1100 bar) of the process for converting filter residues in seawater aquaculture into feed on the performance of the finished product. Implementation steps: Raw material mixing: Take 100 kg of seawater aquaculture filter residues with a moisture content of 75% and mix them with 50 kg of small fish waste Mix (weight ratio 2:1), add to a stirring device, stir at 200 revolutions per minute for 20 minutes, and adjust the formula so that the initial protein content of the mixed material is 10.5%. Pre-crushing: Use a crusher to crush the mixed material to a particle size ≤ 2 mm. Suspending agent addition: Add sodium carboxymethylcellulose and guar gum (1:1 compounded) at a total concentration of 0.3%. Stir and mix evenly. High-pressure homogenization: Use a plunger homogenizer (the homogenizing valve is made of tungsten carbide), control the pressure at 1100 bar and the flow rate at 200 L / h, and process the material until the pathogenic bacteria are broken. Cooling treatment: Cool the homogenized material to 15 °C through a plate heat exchanger, and the discharge temperature is 22 °C to obtain a liquid fish feed. Implementation effect

[0022] Protein content of the finished product: 11.2%.

[0023] Sedimentation rate after standing for 24 h: 3.2%.

[0024] Inactivation rate of pathogenic bacteria: 99.8%, total number of colonies 800 CFU / g.

[0025] Energy consumption comparison: Save 60% energy consumption compared with traditional high-temperature sterilization. Example

[0026] This example provides a process method for converting seawater aquaculture filter residue into feed, which is used for the implementation of raw material ratio optimization (high-protein shrimp feed). The specific implementation content includes: Implementation purpose: Explore the effect of the optimal ratio (weight ratio 1:1) of seawater aquaculture filter residue and shellfish processing waste on the protein retention rate. Implementation steps: Raw material mixing: Mix 80 kg of filter residue with 80 kg of shellfish processing waste, stir at a speed of 150 revolutions per minute for 15 minutes, and the initial protein content is 10.8%. Pre-crushing: Control the particle size ≤ 1.5 mm. Suspending agent addition: The same as Example 1 (0.3% compounding agent). High-pressure homogenization: Pressure 1000 bar, flow rate 180 L / h. Cooling treatment: Spiral cooling device, discharge temperature 25 °C. Implementation effect

[0027] Protein content of the finished product: 11.5% (higher than 9.6% of control group 2). Sedimentation rate: 4.1%.

[0028] Target: Litopenaeus vannamei, with the feeding rate increased by 15%. Example

[0029] This example provides a process method for converting filter residue into feed in seawater aquaculture, which is used for the implementation of the comparison of suspending agent concentrations (verification of critical concentration). The specific implementation content includes: Purpose of implementation: Verify the optimality of the suspending agent concentration of 0.3%. Implementation steps: Raw material mixing: 120 kg of filter residue and 60 kg of seaweed residue (weight ratio 2:1), with an initial protein content of 10.3%.

[0030] Adding suspending agent: Three groups of experiments are conducted. Group A has 0.1%, Group B has 0.3% (the present invention), and Group C has 0.5%.

[0031] Homogenization and cooling: Pressure 1200 bar, flow rate 220 L / h, cooled to 10 °C. Conclusion: The suspension stability and fluidity are the best at a concentration of 0.3%. Example

[0032] This example provides a process method for converting filter residue into feed in seawater aquaculture, which is used for the implementation of the high-pressure homogenization pressure limit test. The specific implementation content includes: Purpose of implementation: Verify the influence of pressure boundary values (1000 bar and 1200 bar) on the sterilization effect. Implementation steps: Raw material mixing: Filter residue and shrimp and crab offal are mixed at a ratio of 1:1.5, with an initial protein content of 10.6%. Homogenization treatment: Experimental group 1: Pressure 1000 bar, flow rate 190 L / h.

[0033] Experimental group 2: Pressure 1200 bar, flow rate 210 L / h.

[0034] Other steps: The same as Example 1. Implementation effect

[0035] 1000 bar group: The inactivation rate of pathogenic bacteria is 99.2%, and the total number of colonies is 950 CFU / g.

[0036] 1200 bar group: The inactivation rate of pathogenic bacteria is 99.9%, and the total number of colonies is 700 CFU / g.

[0037] Both meet the sterilization index of Claim 4 (≥99%, ≤1000 CFU / g). Example

[0038] This embodiment provides a process method for converting filter residue in seawater aquaculture into feed, which is used for the implementation of special scenario applications (crab-specific feed). The specific implementation content includes: Purpose of implementation: Adjust the formula according to the nutritional requirements of river crabs, and verify the influence of pH value control (6.8 - 7.2) on feeding preference. Implementation steps: Raw material mixing: 90 kg of filter residue + 90 kg of seaweed residue (weight ratio 1:1), add calcium source to adjust the mineral ratio, and the initial protein is 10.4%. Suspending agent and homogenization: The same as in Example 1, additionally add food-grade citric acid to adjust the pH to 7.0.

[0039] Cooling treatment: The discharge temperature is 20 °C. Implementation effect

[0040] pH value of the finished product: 7.0.

[0041] Sedimentation rate: 3.8%.

[0042] The feeding response time of river crabs is shortened by 20% compared with commercially available feed, and the survival rate during molting period is increased by 10%.

[0043] This comparative example provides the traditional static composting method. Implementation steps: Take the same filter residue and mix it with small fish and shrimp waste (1:0.5), and conduct natural composting fermentation for 48 days, with turning the pile 3 times during the period. After fermentation, dry and crush to obtain powdered feed. Implementation effect

[0044] Protein content: 8.6% (23% lower than that in Example 1).

[0045] Salt content: 5.2% (2.1% higher than that of liquid feed).

[0046] Fermentation cycle: 48 days (45 days longer than the process of the present invention).

[0047] This comparative example provides the traditional high-temperature sterilization method. Implementation steps: After mixing the raw materials, pre-crush them, and heat them in a sterilization box at 120 °C for 30 minutes. After cooling, add a single suspending agent (only 0.3% sodium carboxymethylcellulose), and stir to obtain liquid feed. Implementation effect

[0048] Protein content: 9.6% (14% lower than that in Example 1).

[0049] Inactivation rate of pathogenic bacteria: 95% (not meeting the requirement of ≥99% of the present invention).

[0050] Energy consumption: 30 kWh of electricity is consumed per 100 kg of material (only 12 kWh in the present invention). Compared with Examples 1-5 and Comparative Examples 1-2, the solution of the present invention has the following advantages: Verification of core advantages: The protein content of the finished products in all examples is ≥ 10.9%, significantly higher than that of the comparative examples; the sedimentation rate ≤ 5%, and the suspension stability is excellent; the sterilization effect meets the requirement that the inactivation rate of pathogenic bacteria ≥ 99%. Parameter robustness: When the pressure, raw material ratio, and suspending agent concentration fluctuate within the scope of the claims, the performance of the finished products meets the expectations, proving the process stability. Outstanding comparative advantages: Compared with the traditional method, the process cycle of the present invention is shortened by 94%, the protein retention rate is increased by 26%-34%, and the energy consumption is reduced by more than 50%, achieving a technological breakthrough of "high efficiency, low consumption, and environmental protection". The following is a comparison summary of Examples 1-5 and Comparative Examples 1-2 in terms of core performance, process efficiency, and application.

[0051] The protein content of the finished products in all examples is ≥ 10.9% (11.5% in Example 2), which is increased by 26%-34% compared with Comparative Example 1 (8.6%) and by 13%-19% compared with Comparative Example 2 (9.6%), proving the significant advantage of the high-pressure homogenization process in nutrient retention (the traditional method causes protein degradation due to high temperature / long-time fermentation).

[0052] The inactivation rate of pathogenic bacteria is ≥ 99% (99.8% in Example 1), and the total number of colonies ≤ 1000 CFU / g, fully meeting the sterilization index of Claim 4; while the high-temperature sterilization method of Comparative Example 2 only reaches an inactivation rate of 95%, not meeting the requirements of the present invention.

[0053] The defects of the comparative examples are prominent: Traditional static composting (Comparative Example 1) has a long fermentation cycle (48 days) and high salt inhibits the growth of bacteria, resulting in serious protein loss and a salt content (5.2%) higher than that of liquid feed (≤ 2.1%).

[0054] Traditional high-temperature sterilization (Comparative Example 2) shortens the cycle, but heating at 120°C causes protein structure damage, and the suspension stability of a single suspending agent (only sodium carboxymethylcellulose) is poor (the sedimentation rate was not measured, but the fluidity is lower than that of the compound system).

[0055] The process of the present invention is highly efficient and low in energy consumption: The cycle is significantly shortened: The average process time of the examples ≤ 2 hours (mixing + crushing + homogenization + cooling), which is shortened by 94% compared with 48 days of Comparative Example 1, solving the pain point of the time cost of traditional composting.

[0056] Significant reduction in energy consumption: Taking 100 kg of materials as an example, the energy consumption of the present invention is ≤ 12 kWh (Example 1 saves 60%), while Comparative Example 2 requires 30 kWh. The high-pressure homogenization for breaking walls and sterilization does not require additional heating, showing prominent energy consumption advantages.

[0057] Strong parameter robustness: In Examples 3 - 4, when the concentration of the suspending agent (0.3%) and the homogenization pressure (1000 - 1200 bar) fluctuate within the scope of the claims, the sedimentation rate of the finished product is ≤ 5% (the best is 4.8%), and the sterilization effect meets the standards, proving the process stability.

[0058] Inherent defects of traditional methods: The composting method relies on natural fermentation, is greatly affected by environmental temperature and humidity, is prone to produce odors and has a high risk of salt damage; the high-temperature sterilization method requires drying and crushing steps, increasing equipment investment and energy consumption.

[0059] Examples cover different aquaculture organisms: Fish feed (Example 1): The universality of the suspending agent is verified through the basic formula. The sedimentation rate of 3.2% ensures the dispersibility in water and is suitable for the feeding habits of fish.

[0060] High-protein shrimp feed (Example 2): Adjust the ratio of filter residue to shellfish waste (1:1), the protein content reaches 11.5%, and the feeding rate of Litopenaeus vannamei increases by 15%, meeting the high demand of crustaceans for amino acids.

[0061] Special feed for crabs (Example 5): Add a calcium source and control the pH value at 7.0, and the survival rate of river crabs during the molting period increases by 10%, proving that the special nutritional requirements (such as minerals, pH tolerance range) can be accurately matched through formula adjustment.

[0062] Synergistic advantages of the suspending agent and homogenization technology: Example 3 proves through gradient experiments that when sodium carboxymethylcellulose and guar gum are compounded at a ratio of 1:1 (concentration of 0.3%), the sedimentation rate and fluidity reach the best balance (viscosity 500 mPa・s), avoiding the problems of too high viscosity (0.5% group) or insufficient stability (0.1% group) of a single suspending agent.

[0063] Empirical evidence of core innovation points: Dosage form revolution: The suspending agent dosage form avoids the energy consumption of drying, and the liquid state is more easily ingested and absorbed by aquaculture organisms. The sedimentation rate data (≤ 5%) of Examples 1 - 5 directly supports the claim of "uniform dispersion without drying".

[0064] Retention of both sterilization and nutrition: While breaking walls and sterilizing by high-pressure homogenization, the protein activity is maximally retained through low-temperature treatment (the discharge temperature ≤ 25°C), forming a technical barrier compared with the "high-temperature destruction of nutrition" of traditional methods.

[0065] Strong raw material compatibility: It covers a variety of raw materials such as small fish, shellfish waste, and seaweed residue (Examples 2 and 5), realizing the synergistic effect of multiple low-value resources and conforming to the concept of circular economy.

[0066] The above embodiments can be implemented in whole or in part by software, hardware, firmware, or any other combination. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product.

[0067] Those of ordinary skill in the art can realize that the modules and algorithm steps of each example described in combination with the embodiments disclosed in this document can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of this application.

[0068] In addition, the functional modules in each embodiment of this application can be integrated into a processing module, or each module can exist physically alone, or two or more modules can be integrated into one module.

[0069] The above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed in this application can easily think of changes or substitutions, which should all be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

[0070] Finally: The above is only the preferred embodiment of the present invention and is not used to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A process method for converting filter residues in seawater aquaculture into feed, characterized in that, It includes the following steps: S1: Mix the seawater aquaculture filter residues with other low-value aquatic products or food processing by-products at a weight ratio of 1:0.5 - 1:2, adjust the raw material ratio according to the nutritional requirements of the cultured organisms, so that the protein content of the mixed raw material mixture is ≥ 10.3%, and form the material to be treated; S2: Perform pre-crushing treatment on the material to be treated so that the particle size of the material is ≤ 2 mm; S3: Add a compound ratio of sodium carboxymethyl cellulose and guar gum of 1:1 to the crushed material as a suspending agent, and the total concentration of the suspending agent is 0.3%, and stir and mix evenly; S4: Use high-pressure homogenization technology to treat the mixed material, control the homogenization pressure at 1000 - 1200 bar and the flow rate at 180 - 220 L / h, so that the pathogenic bacteria are broken and inactivated and the liquid protein is evenly dispersed; S5: Perform cooling treatment on the homogenized material, control the discharge temperature ≤ 25 °C, and prepare a compound liquid feed suspension with a protein content ≥ 10.9% and a sedimentation rate ≤ 5% after standing for 24 h.

2. The process method for converting filter residue in seawater aquaculture into feed as claimed in claim 1, wherein The other low-value aquatic products include small fish and shrimp and crab offal, and the food processing by-products include seaweed residues and shellfish processing waste.

3. The process method for converting filter residues of seawater aquaculture into feed according to claim 1, wherein, In step S1, the mixing process is carried out in a stirring device, the stirring speed is 100 - 300 revolutions per minute, and the stirring time is 10 - 30 minutes.

4. The process method for converting filter residue of seawater aquaculture into feed as described in claim 1, characterized in that, In step S4, the high-pressure homogenization treatment makes the inactivation rate of pathogenic bacteria in the compound liquid feed ≥ 99% and the total number of colonies ≤ 1000 CFU / g.

5. The process method for converting filter residue of seawater aquaculture into feed according to claim 1, characterized in that, The compound liquid feed meets the nutritional requirements of different cultured organisms such as fish, shrimp, and crab by adjusting the raw material ratio.

6. The process method for converting filter residue in seawater aquaculture into feed according to claim 1, characterized in that The suspending system formed by the compound of sodium carboxymethyl cellulose and guar gum improves the stability of the suspension through synergistic action and avoids the aggregation and sedimentation of protein particles.

7. The process method for converting filter residue of seawater aquaculture into feed according to claim 1, characterized in that, In step S5, the cooling treatment uses a plate heat exchanger or a spiral cooling device, and the cooling medium is circulating cooling water or an ice-water mixture.

8. The process method of converting filter residue into feed for seawater aquaculture according to claim 1, characterized in that, The moisture content of the seawater aquaculture filter residues is 60% - 80%, and no drying and dehydration treatment is required before mixing.

9. The process method for converting filter residue of seawater aquaculture into feed according to claim 1, characterized in that, The high-pressure homogenization equipment uses a piston-type homogenizer, and the material of the homogenization valve assembly is tungsten carbide or zirconia to ensure wear resistance under high-pressure environment.

10. The process method for converting filter residue in seawater aquaculture into feed as described in claim 1, characterized in that, The pH value of the compound liquid feed is controlled at 6.5 - 7.5 to avoid adverse stimulation during the feeding of cultured organisms.

Images