Aquaculture solid waste treatment method based on ecology and resource recycling

Abstract

The application relates to the technical field of aquaculture waste treatment, and discloses an aquaculture solid waste treatment method based on ecology and resource recycling, which comprises the following steps: step one, breeding of microalgae strains resistant to high pollution conditions; step two, construction of a microalgae and bacteria-algae group comprehensive treatment system; step three, introduction of tail water into an algae pond, absorption of nitrogen and phosphorus nutrients in the water by microalgae, and purification of the water body; step four, direct discharge of the purified algae water into a sedimentation tank; step five, collection of solid waste formed after tail water treatment and mixing with microalgae water; step six, construction of an earthworm composting treatment system; and step seven, putting of the pretreated solid waste into an earthworm composting bed, decomposition of organic waste by earthworms, and production of earthworm manure. The application not only reduces consumption of fresh water resources, but also reduces environmental pollution caused by aquaculture, and significantly improves the utilization efficiency of water resources.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aquaculture waste treatment, in particular to an aquaculture solid waste treatment method based on ecology and resource recycling. BACKGROUND

[0002] With the rapid development of aquaculture industry, a large amount of wastewater and solid waste generated during the cultivation process has caused serious pollution to the environment. Traditional wastewater treatment methods, such as physical sedimentation, chemical treatment and biological treatment, can reduce the content of pollutants in water to some extent, but these methods often have problems such as high treatment cost, low efficiency and secondary pollution. In addition, the treatment and utilization of aquaculture solid waste is also a difficult problem to be solved. Traditional landfill or incineration treatment not only wastes valuable organic resources, but also may cause pollution to soil and air. In addition, the method of sun oxidation as waste occupies a large area and is not conducive to large-scale implementation.

[0003] Existing aquaculture wastewater treatment technology mainly relies on single biological treatment systems, such as microbial degradation or artificial wetland systems. These methods often have poor effect when treating high-concentration pollutants, and the treatment efficiency is unstable. At the same time, since the aquaculture wastewater contains a large amount of nitrogen, phosphorus and other nutrients, if not properly treated, it is easy to cause water eutrophication, leading to the proliferation of algae and destroying the water ecological balance.

[0004] On the other hand, traditional solid waste treatment methods such as composting and vermicomposting have certain advantages in organic waste degradation, but still face some challenges in practical application. For example, during the composting process, the carbon-nitrogen ratio, humidity and temperature need to be strictly controlled, otherwise problems such as corruption, odor and low efficiency may occur. Although vermicomposting can efficiently decompose organic matter, it still needs to further optimize the treatment system to improve its treatment capacity and efficiency for treating a large amount of aquaculture waste.

[0005] Therefore, the existing technology has problems such as low treatment efficiency, high cost, resource waste and possible secondary pollution in treating aquaculture wastewater and solid waste. There is an urgent need for a comprehensive treatment method based on ecology and resource recycling, which can efficiently and economically treat aquaculture waste, realize resource recycling and reduce environmental pollution. SUMMARY

[0006] In view of the deficiencies of the prior art, the present application provides an aquaculture solid waste treatment method based on ecology and resource recycling, which solves the problems of low treatment efficiency, high cost, resource waste and possible secondary pollution in treating aquaculture wastewater and solid waste.

[0007] In order to achieve the above object, the present application is implemented by the following technical scheme: the aquaculture solid waste treatment method based on ecology and resource recycling, comprising the following steps:

[0008] Step one, breeding microalgae strains resistant to high pollution conditions;

[0009] Step two, constructing a microalgae and bacteria-algae group comprehensive treatment system;

[0010] Step three, introducing tail water into an algae pond, absorbing nitrogen and phosphorus nutrients in the water through microalgae, and purifying the water body;

[0011] Step four, directly discharging the purified algae water to a sedimentation tank;

[0012] Step five, collecting the solid waste formed after tail water treatment and mixing with microalgae water;

[0013] Step six, constructing an earthworm composting treatment system;

[0014] Step seven, putting the pretreated solid waste into the earthworm composting bed, decomposing organic waste by earthworms, and producing earthworm manure.

[0015] Preferably, the microalgae strain is Scenedesmus obliquus, which has a high ammonia nitrogen concentration tolerance of 300 mg / L, a high pH range of 8-12, and a phosphate absorption capacity of 2.5 mg / L / d.

[0016] Preferably, the microalgae treatment system comprises:

[0017] Algae pond: for large-scale cultivation of microalgae, through light and ventilation conditions to promote the growth of microalgae;

[0018] Active algae pool: for increasing the density of microalgae and enhancing the absorption efficiency of nitrogen and phosphorus;

[0019] Immobilized algae pool: immobilizing microalgae on carriers for further purification of tail water.

[0020] Preferably, the earthworm composting treatment system comprises:

[0021] Earthworm composting bed: providing suitable temperature, humidity and ventilation conditions to promote the growth and reproduction of earthworms;

[0022] Regularly supplementing solid waste and microalgae water: ensuring that the materials in the earthworm composting bed maintain a suitable carbon-nitrogen ratio to improve the decomposition efficiency of earthworms.

[0023] Preferably, the mixing ratio of solid waste and microalgae water is adjusted to 15:1 to 30:1 to provide the best conditions for earthworm treatment.

[0024] Preferably, the earthworms secrete amylase, cellulase and protease through their intestines, efficiently decompose solid waste, and convert it into nutrient-rich vermicompost.

[0025] Preferably, in the earthworm composting system, the composting bed is turned over 1-2 times per week to increase aeration and ensure uniform oxygen supply.

[0026] Preferably, the temperature of the earthworm composting bed ranges from 15°C to 25°C, and the humidity ranges from 60% to 80%.

[0027] Preferably, the density of microalgae in the microalgae treatment system is controlled at 10^6 to 10^8 cells per liter of water to ensure optimal purification effect.

[0028] Preferably, the light cycle control technology is used in the microalgae treatment system to simulate natural light conditions to optimize the photosynthesis efficiency and nutrient absorption capacity of microalgae.

[0029] The present application provides an ecological and resource recycling-based solid waste treatment method for aquaculture. It has the following beneficial effects:

[0030] 1. The present application purifies tail water through a microalgae treatment system, effectively removing nitrogen, phosphorus and other pollutants in the water, so that the treated water can be recycled and used in the aquaculture system. This not only reduces the consumption of fresh water resources, but also reduces the environmental pollution caused by aquaculture, significantly improving the utilization efficiency of water resources.

[0031] 2. The present application recycles the nutrients in solid waste and tail water generated during aquaculture. The microalgae system absorbs nitrogen and phosphorus in the tail water and converts it into microalgae biomass, which is then treated with earthworm composting along with solid waste to produce high-quality organic fertilizer. This resource recycling method not only reduces waste emissions, but also provides high-quality organic fertilizer for agricultural production.

[0032] 3. The microalgae treatment and earthworm composting techniques used in the present application are both biological treatment methods in natural ecosystems, which are environmentally friendly and do not cause secondary pollution. Microalgae absorb nutrients in tail water through photosynthesis and release oxygen, which helps to improve water quality. The earthworm composting process utilizes the natural decomposition ability of earthworms to convert organic waste into nutrient-rich vermicompost. Both methods do not rely on chemical treatment, reducing the use of chemical agents and protecting the environment. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 The flowchart of the method of the present application; DETAILED DESCRIPTION

[0034] With reference to the accompanying drawings on which some embodiments of the application are shown, the aspects of the embodiments of the application will be described in a complete and complete manner. Obviously, the described embodiments are only a part of the embodiments of the application, not all. Based on the embodiments of the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0035] Embodiments:

[0036] Please refer to the accompanying Figure 1 The embodiments of the present application provide an aquaculture solid waste treatment method based on ecology and resource recycling, which comprises the following steps:

[0037] Step one, breeding of microalgae strains resistant to high pollution conditions;

[0038] In the present application, we breed a microalgae strain resistant to high pollution conditions, mainly using Scenedesmus obliquus. This microalgae can survive in conditions with ammonia nitrogen concentration as high as 300mg / L, and has good growth ability in the pH range of 8-12. In addition, the phosphate absorption capacity of Scenedesmus obliquus can reach 2.5mg / L / d. These characteristics make it an ideal choice for treating highly polluted tail water.

[0039] Scenedesmus obliquus is selected as the microalgae strain, which is cultured and domesticated in the laboratory to enable it to grow stably under high pollution conditions. Specifically, the microalgae strain has the following characteristics:

[0040] Resistant to high ammonia nitrogen concentration: can grow normally under 300mg / L ammonia nitrogen concentration.

[0041] Resistant to high pH range: adapt to pH 8 to 12 environment.

[0042] High phosphate absorption capacity: daily phosphate absorption capacity is more than 2.5mg / L / d.

[0043] The Scenedesmus obliquus obtained by domestication has the ability to grow stably under extreme pollution conditions, ensuring efficient absorption of nitrogen, phosphorus and other nutrients in tail water treatment, thereby effectively reducing the risk of eutrophication of water body.

[0044] Step two, construction of microalgae and bacteria-algae group comprehensive treatment system;

[0045] A microalgae treatment system including multiple stages is constructed to ensure that nitrogen, phosphorus and other nutrients in tail water can be effectively absorbed. The system mainly includes the following three parts:

[0046] Algal pond: used for large-scale cultivation of Scenedesmus obliquus. The algal pond is equipped with appropriate lighting and ventilation conditions to promote the growth of microalgae.

[0047] Active algae pool: used to increase the density of microalgae, thereby improving their absorption efficiency of nitrogen and phosphorus. By regularly supplementing nutrients and adjusting the water flow rate, microalgae in the active algae pool are kept highly active.

[0048] Immobilized algae pool: Scenedesmus obliquus is immobilized on a carrier, enabling it to further purify tail water. Immobilized microalgae not only effectively absorb pollutants in tail water, but also produce oxygen through photosynthesis, further improving water quality. Scenedesmus obliquus is wrapped in algae beads, which are usually formed by mixing algae and certain natural or synthetic high molecular materials such as sodium alginate and calcium chloride. These materials form a gel in water, which can immobilize microalgae. This method not only maintains the activity of microalgae, but also immobilizes them in water, thereby improving their treatment effect.

[0049] This system achieves efficient purification of tail water through the synergistic effect of different functional units. The algal pond provides a large amount of biomass, the active algae pool improves the treatment efficiency, and the immobilized algae pool further enhances the treatment effect through physical immobilization.

[0050] Step three, introduce tail water into the algal pond, and purify the water body by absorbing nitrogen and phosphorus nutrients in the water through microalgae;

[0051] Introduce tail water into the algal pond, and microalgae absorb nitrogen, phosphorus and other nutrients in the water body through photosynthesis, reducing chemical oxygen demand (COD) and biochemical oxygen demand (BOD).

[0052] Microalgae convert nitrogen and phosphorus in water into their own biomass through photosynthesis, reducing the concentration of nutrients in the water body, preventing eutrophication, and achieving significant purification effect.

[0053] Step four, discharge the purified algae water directly to the sedimentation tank;

[0054] Without separating microalgae, the purified algae water is directly discharged to the sedimentation tank, combined with subsequent solid waste treatment.

[0055] This step avoids the complex process of microalgae separation in traditional methods, simplifies the operation process, and further adjusts the carbon-nitrogen ratio of solid waste using microalgae water to facilitate subsequent treatment.

[0056] Step five, collect the solid waste formed after tail water treatment and mix it with microalgae water;

[0057] Collect the settled solid waste in the sedimentation tank, including feed residues and fish and shrimp feces, and mix it with microalgae water to adjust the carbon-nitrogen ratio (C / N) to 15:1 to 30:1.

[0058] By adding microalgae water, the carbon content of solid waste is increased, and the carbon-nitrogen ratio reaches the appropriate range for earthworm treatment, laying a good foundation for earthworm treatment.

[0059] Step six, build an earthworm composting system;

[0060] Build an earthworm composting bed to provide suitable temperature, humidity and ventilation conditions to promote the growth and reproduction of earthworms. The temperature is controlled at 15-25℃, and the humidity range is 60-80%.

[0061] By building a suitable earthworm composting environment, ensure that earthworms efficiently decompose solid waste under optimal conditions to produce high-quality earthworm manure.

[0062] Step seven, put the pretreated solid waste into the earthworm composting bed, and let the earthworms decompose organic waste to produce earthworm manure.

[0063] Put the pretreated solid waste into the earthworm composting bed, and let the earthworms decompose organic waste through the secretion of amylase, cellulase and protease in their intestines to convert it into nutrient-rich earthworm manure. Turn the composting bed 1-2 times a week to increase ventilation.

[0064] The efficient decomposition of earthworms significantly improves the treatment efficiency of organic waste, and the generated earthworm manure is rich in organic matter and nutrients, which can be used as high-quality organic fertilizer in agriculture to improve soil fertility and promote plant growth.

[0065] In the earthworm composting system, turn the composting bed 1-2 times a week to increase ventilation and ensure uniform oxygen supply.

[0066] In order to increase the ventilation and oxygen supply in the composting bed, turn the composting bed 1-2 times a week. This operation can ensure that the organic matter in the composting bed is evenly distributed, avoiding local oxygen deficiency, thereby improving the decomposition efficiency of earthworms.

[0067] The temperature range of the earthworm composting bed is 15-25℃, and the humidity range is 60-80%.

[0068] In the earthworm composting system, temperature and humidity are two key factors. The temperature of the composting bed is controlled at 15-25℃, and the humidity is controlled between 60-80%. This range is not only suitable for the growth and reproduction of earthworms, but also helps to quickly decompose organic waste.

[0069] In the microalgae treatment system, the density of microalgae is controlled at 10^6 to 10^8 cells per liter of water to ensure the best purification effect.

[0070] In the microalgae treatment system, the density of Scenedesmus obliquus is controlled between 10^6 to 10^8 cells per liter of water. This density range ensures the optimal purification effect of microalgae. In addition, by using light cycle control technology, the natural light conditions are simulated, further optimizing the photosynthesis efficiency and nutrient absorption capacity of microalgae.

[0071] Example One:

[0072] Step One: Selecting microalgae strains resistant to high pollution conditions

[0073] Scenedesmus obliquus is selected, which can tolerate 300 mg / L high ammonia nitrogen concentration, adapt to pH range 8-12, and has phosphate absorption capacity of 2.5 mg / L / d.

[0074] Step Two: Constructing a comprehensive microalgae and bacteria-algae treatment system

[0075] A microalgae treatment system including an algae pond, an active algae pool, and an immobilized algae pool is constructed.

[0076] Algae pond: light intensity 5000 lux, ventilation rate 2 L / min.

[0077] Active algae pool: microalgae density reaches 10^7 cells / L, and nutrients are supplemented regularly.

[0078] Immobilized algae pool: microalgae are immobilized in alginate beads formed by sodium alginate and calcium chloride.

[0079] Step Three: Introducing tail water into the algae pond

[0080] Tail water flow rate: 5 L / min, nitrogen content in water: 80 mg / L, phosphorus content: 5 mg / L.

[0081] Step Four: Discharging purified algae water to the sedimentation tank The sedimentation tank is kept still for 30 minutes before discharging.

[0082] Step Five: Collecting solid waste and mixing with microalgae water

[0083] The treated solid waste is mixed with microalgae water at a solid waste / microalgae water mass ratio of 2:1.

[0084] Step Six: Constructing an earthworm composting treatment system

[0085] The earthworm composting bed maintains a temperature of 20°C and a humidity of 70%.

[0086] Step Seven: Introducing pretreated solid waste into the earthworm composting bed The solid waste and microalgae water mixture is supplemented once a week.

[0087] Example Two: Step One: Selecting a microalgal strain that tolerates high pollution conditions

[0088] Selecting Scenedesmus obliquus with the same characteristics as Example 1.

[0089] Step Two: Constructing a microalgal-bacterial consortium integrated treatment system

[0090] Algal pond: light intensity 6000 lux, ventilation rate 2.5 L / min.

[0091] Active algal pond: microalgal density reached 10^8 cells / L.

[0092] Immobilized algal pond: microalgae immobilized on nylon mesh fiber matrix.

[0093] Step Three: Introducing the effluent into the algal pond

[0094] Effluent flow rate: 4 L / min, nitrogen content in water: 100 mg / L, phosphorus content: 8 mg / L.

[0095] Step Four: Discharging the purified algal water to the sedimentation tank

[0096] The sedimentation tank was kept still for 45 minutes before discharging.

[0097] Step Five: Collecting solid waste and mixing with microalgal water

[0098] The solid waste / microalgal water mass ratio was adjusted to 3:1.

[0099] Step Six: Constructing a vermicomposting treatment system

[0100] The vermicomposting bed was kept at a temperature of 18°C and a humidity of 65%.

[0101] Step Seven: Introducing the pretreated solid waste into the vermicomposting bed twice a week with a solid waste and microalgal water mixture.

[0102] Example Three: Optimizing the vermicomposting bed conditions

[0103] Step One: Selecting a microalgal strain that tolerates high pollution conditions

[0104] Selecting Scenedesmus obliquus with the same characteristics as Example 1.

[0105] Step Two: Constructing a microalgal-bacterial consortium integrated treatment system

[0106] Algal pond: light intensity 5000 lux, ventilation rate 2 L / min.

[0107] Active algal pond: microalgal density reached 10^7 cells / L.

[0108] Immobilized algal pond: microalgae immobilized on polyacrylamide microcarriers.

[0109] Step three: Introduce the effluent into the algae pond

[0110] Effluent flow rate: 5 L / min, Nitrogen content in water: 80 mg / L, Phosphorus content: 5 mg / L.

[0111] Step four: Discharge the purified algae water into the sedimentation tank

[0112] The sedimentation tank is kept still for 30 minutes before discharging.

[0113] Step five: Collect the solid waste and mix with the microalgae water The solid waste / microalgae water mass ratio is 2:1.

[0114] Step six: Construct the vermicomposting treatment system

[0115] The vermicomposting bed is kept at a temperature of 22°C and a humidity of 75%.

[0116] Step seven: Introduce the pretreated solid waste into the vermicomposting bed The solid waste and microalgae water mixture is supplemented once a week, and the composting bed is turned twice.

[0117] Step one: Select a microalgae strain that is tolerant to high pollution conditions

[0118] The Scenedesmus obliquus is selected, and the characteristics are the same as in Example 1.

[0119] Step two: Construct the microalgae and bacteria-algae group comprehensive treatment system Algae pond: light intensity 7000 lux, ventilation rate 2.5 L / min.

[0120] Active algae pool: microalgae density reaches 10^8 cells / L.

[0121] Immobilized algae pool: microalgae are immobilized on porous ceramic.

[0122] Step three: Introduce the effluent into the algae pond Effluent flow rate: 6 L / min, Nitrogen content in water: 120 mg / L, Phosphorus content: 10 mg / L. Step four: Discharge the purified algae water into the sedimentation tank

[0123] The sedimentation tank is kept still for 30 minutes before discharging.

[0124] Step five: Collect the solid waste and mix with the microalgae water The solid waste / microalgae water mass ratio is 3:2.

[0125] Step six: Construct the vermicomposting treatment system

[0126] The vermicomposting bed is kept at a temperature of 19°C and a humidity of 70%.

[0127] Step 7: Place the pre-treated solid waste into the vermicomposting bed and replenish the solid waste and microalgae water mixture once a week.

[0128] Example 5: Optimizing the carbon-nitrogen ratio

[0129] Step 1: Breeding microalgae strains that tolerate high pollution conditions

[0130] Scenedesmus obliquus was selected and bred, and its characteristics were the same as those in Example 1.

[0131] Step 2: Construct an algae pond with an integrated treatment system for microalgae and bacterial algae clusters: light intensity 5000 l ux, ventilation rate 2 L / min.

[0132] Active algae pool: The density of microalgae reaches 10^7 cells / L.

[0133] Immobilized algae pool: microalgae are fixed in algae beads formed by sodium alginate and calcium chloride.

[0134] Step 3: Introduce tail water into the algae pond. Tail water flow rate: 5L / min, nitrogen content in water: 80mg / L, phosphorus content: 5mg / L. Step 4: Discharge the purified algae water into the sedimentation tank

[0135] Keep the water in the sedimentation tank still for 30 minutes before discharging.

[0136] Step 5: Collect solid waste and mix it with microalgae water. The solid waste / microalgae water mass ratio is 15:1 to 30:1.

[0137] Step 6: Build a vermicomposting system

[0138] The vermicomposting bed was maintained at a temperature of 20°C and a humidity of 70%.

[0139] Step 7: Place the pre-treated solid waste into the vermicomposting bed and replenish the solid waste and microalgae water mixture once a week.

[0140] Comparative experimental design

[0141] In order to verify the advantages of the present invention, the comparative experiments are designed as follows:

[0142] Experimental conditions:

[0143] Experimental group: using the method of the present invention (Example 1)

[0144] Control group: using traditional physical precipitation + chemical treatment method

[0145] Experimental period: 30 days

[0146] Experimental data collection: nitrogen and phosphorus content in water, efficiency of solid waste conversion into organic fertilizer, number and quality of earthworms. The data are shown in the following table:

[0147] Item Experimental group (Example 1) Control group Initial nitrogen content (mg / L) 80 80 Nitrogen content after treatment (mg / L) 10 30 Initial phosphorus content (mg / L) 5 5 Phosphorus content after treatment (mg / L) 0.5 2.5 Initial mass of solid waste (kg) 100 100 Conversion rate of solid waste (%) 90 60 Initial number of earthworms (pieces) 1000 - Final number of earthworms (pieces) 1500 - Production of earthworm manure (kg) 80 -

[0148] The experimental data show that the method of the present application (experimental group) is significantly better than the traditional method (control group) in treating the nitrogen and phosphorus content of the water body. At the same time, the conversion rate of solid waste and the production of earthworm manure also show that the method of the present application has higher resource utilization efficiency. The increase in the number of earthworms further verifies the effectiveness of the earthworm composting treatment system. In summary, the aquaculture solid waste treatment method based on ecology and resource recycling of the present application has significant advantages in environmental protection and resource utilization.

[0149] Example six: comprehensive treatment of tail water by bacteria-algae group

[0150] Step one: breeding of microalgae strains tolerant to high pollution conditions

[0151] Scenedesmus obliquus is bred, which tolerates 300 mg / L high ammonia nitrogen concentration, adapts to pH range 8-12, and has phosphate absorption capacity of 2.5 mg / L / d.

[0152] Step two: breeding of strains with high efficiency of degrading organic matter

[0153] A strain with high efficiency of degrading organic matter, such as nitrifying bacteria (Nitrosomonas sp.) and denitrifying bacteria (Pseudomonas sp.), is bred to enhance the decomposition ability of organic matter.

[0154] Step three: construction of bacteria-algae group comprehensive treatment system

[0155] Algal pond: used for large-scale cultivation of Scenedesmus obliquus, light intensity 5000 lux, ventilation rate 2 L / min.

[0156] Active algal pond: used to increase the density of microalgae, density reaching 10^7 cells / L.

[0157] Immobilized algal pond: microalgae are immobilized in algal beads formed by sodium alginate and calcium chloride.

[0158] Bacteria-algae mixed pond: the bred high-efficiency strains are mixed with Scenedesmus obliquus for cultivation, forming a bacteria-algae group.

[0159] Step four: introduction of tail water into algal pond

[0160] Tail water flow rate: 5 L / min, nitrogen content in water: 80 mg / L, phosphorus content: 5 mg / L.

[0161] Step five: introduction of bacteria-algae mixed pond for comprehensive treatment

[0162] In the bacteria-algae mixed pool, microalgae absorb nitrogen and phosphorus nutrients from water, while efficient strains degrade organic matter. The bacteria-algae group improves the treatment efficiency through interaction.

[0163] Step six: The purified algal water is directly discharged into the sedimentation tank

[0164] The sedimentation tank is kept still for 30 minutes before discharging, removing suspended particles.

[0165] Step seven: Collect the solid waste formed after the tail water treatment, and mix it with microalgae water The treated solid waste and microalgae water are mixed at a solid waste / microalgae water mass ratio of 2:1.

[0166] Step eight: Construct the earthworm composting treatment system

[0167] The earthworm composting bed maintains a temperature of 20°C and a humidity of 70%.

[0168] Step nine: Put the pretreated solid waste into the earthworm composting bed

[0169] The solid waste and microalgae water mixture is supplemented once a week.

[0170] Comparison experiment design

[0171] Experimental conditions:

[0172] Experimental group: Adopting bacteria-algae group comprehensive treatment method (Example 6)

[0173] Control group: Adopting microalgae treatment method (Example 1)

[0174] Experimental period: 30 days

[0175] Experimental data collection: Water nitrogen, phosphorus content, organic matter content, solid waste conversion to organic fertilizer efficiency, earthworm number and mass.

[0176] Experimental data table:

[0177]

[0178]

[0179] The experimental data shows that the experimental group using the bacteria-algae group comprehensive treatment method is significantly better than the control group using only the microalgae treatment method in terms of treating water nitrogen, phosphorus and organic matter content. In addition, the conversion rate of solid waste and the production of earthworm manure are also higher than those of the control group, and the increase in the number of earthworms further proves the effectiveness of the bacteria-algae group treatment method. In summary, the bacteria-algae group comprehensive treatment method has significant advantages in environmental protection and resource utilization.

[0180] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. A method for treating aquaculture solid waste based on ecology and resource recycling, characterized in that: The following steps are involved: Step 1: Selecting microalgae strains that can tolerate high pollution conditions; Step 2: Breeding bacterial strains that can efficiently degrade organic matter; Step 3: Construct a comprehensive treatment system for microalgae and bacterial algae clusters, including: Algae pond: used for large-scale cultivation of microalgae, through light and ventilation conditions to promote the growth of microalgae, Active algae pool: used to increase the density of microalgae and enhance the absorption efficiency of nitrogen and phosphorus. Fixed algae pool: fix the microalgae on the carrier to further purify the tail water. Bacteria-algae mixed pool: the selected high-efficiency strains are mixed with microalgae to form bacteria-algae clusters; Step 4: The tail water is introduced into the algae pond, where the microalgae absorb nitrogen and phosphorus nutrients in the water to purify the water. Step 5: Introduce bacteria and algae mixing pool for comprehensive treatment; Step 6: Discharge the purified algae water directly into the sedimentation tank; Step 7: collecting solid waste formed after tail water treatment and mixing it with microalgae water; Step 8: Construct a vermicomposting system; Step 9: Place the pre-treated solid waste into the vermicomposting bed, where earthworms decompose the organic waste to produce vermicompost.

2. The aquaculture solid waste treatment method based on ecology and resource recycling according to claim 1 is characterized in that: The microalgae strain is Scenedesmus obliquus, which has the ability to tolerate a high ammonia nitrogen concentration of 300 mg / L, a high pH range of 8-12, and a phosphate absorption capacity of 2.5 mg / L / d.

3. The aquaculture solid waste treatment method based on ecology and resource recycling according to claim 1 is characterized in that: The earthworm composting system comprises: Vermicomposting bed: provides suitable temperature, humidity and ventilation conditions to promote the growth and reproduction of earthworms; Regularly add solid waste and microalgae water: Ensure that the materials in the vermicomposting bed maintain an appropriate carbon-nitrogen ratio to improve the decomposition efficiency of earthworms.

4. The aquaculture solid waste treatment method based on ecology and resource recycling according to claim 1 is characterized in that: The mixing ratio of the solid waste and the microalgae water is adjusted to a carbon-nitrogen ratio (C / N) of 15:1 to 30:1 to provide optimal conditions suitable for earthworm treatment.

5. The aquaculture solid waste treatment method based on ecology and resource recycling according to claim 1 is characterized in that: The earthworms can efficiently decompose solid wastes through amylase, cellulase and protease secreted from their intestines, and convert the solid wastes into nutrient-rich earthworm castings.

6. The aquaculture solid waste treatment method based on ecology and resource recycling according to claim 1 is characterized in that: In the vermicomposting system, the compost bed is regularly turned 1 to 2 times a week to increase ventilation and ensure uniform oxygen supply.

7. The aquaculture solid waste treatment method based on ecology and resource recycling according to claim 1 is characterized in that: The temperature range of the earthworm compost bed is 15° C. to 25° C., and the humidity range is 60% to 80%.

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