Aquaculture solid waste treatment method based on ecology and resource recycling

Abstract

The invention relates to the technical field of aquaculture waste treatment, and discloses an aquaculture solid waste treatment method based on ecology and resource recycling, and the method comprises the following steps: step 1, breeding microalgae strains tolerant to high pollution conditions; step 2, constructing a microalgae and algal mass comprehensive treatment system; 3, the tail water is introduced into an algae pond, nitrogen and phosphorus nutrient substances in the water are absorbed through microalgae, and the water body is purified; step 4, directly discharging the purified algae-laden water into a sedimentation tank; 5, collecting solid waste formed after tail water treatment, and mixing the solid waste with microalgae water; step 6, constructing an earthworm compost treatment system; 7, the pretreated solid waste is put into an earthworm composting bed, organic waste is decomposed by earthworms, and wormcast is generated. According to the system, consumption of fresh water resources is reduced, pollution of aquaculture to the environment is reduced, and the utilization efficiency of the water resources is remarkably improved.

Description

Technical Field

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

[0002] With the rapid development of aquaculture, a large amount of wastewater and solid waste generated during the breeding process has caused serious environmental pollution. Although traditional wastewater treatment methods, such as physical precipitation, chemical treatment and biological treatment, can reduce the content of pollutants in water to a certain extent, these methods often have problems such as high treatment costs, low efficiency and secondary pollution. In addition, the treatment and utilization of aquaculture solid waste is also a difficult problem that needs to be solved urgently. The traditional landfill or incineration treatment method not only wastes precious organic resources, but also may cause pollution to the soil and air. In addition, the commonly used method of using waste as waste after exposure to oxidation occupies a large area and is not conducive to large-scale implementation.

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

[0004] On the other hand, although traditional solid waste treatment methods such as composting and vermicomposting have shown certain advantages in the degradation of organic waste, they still face some challenges in practical applications. For example, the carbon-nitrogen ratio, humidity and temperature and other conditions need to be strictly controlled during the composting process, otherwise problems such as corruption, odor and low efficiency are likely to occur. Although vermicomposting can efficiently decompose organic matter, for the treatment of large amounts of aquaculture waste, the treatment system still needs to be further optimized to improve its treatment capacity and efficiency.

[0005] Therefore, the existing technology has problems such as low treatment efficiency, high cost, waste of resources and possible secondary pollution when 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 reuse and reduce environmental pollution. Summary of the invention

[0006] In view of the shortcomings of the prior art, the present invention provides a method for treating aquaculture solid waste based on ecology and resource recycling, which solves the problems of low treatment efficiency, high cost, waste of resources and possible secondary pollution when treating aquaculture wastewater and solid waste.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: A method for treating aquaculture solid waste based on ecology and resource recycling, comprising the following steps:

[0008] Step 1: Breeding microalgae strains that can tolerate high pollution conditions;

[0009] Step 2: construct a comprehensive treatment system for microalgae and bacterial algae clusters;

[0010] Step 3: introduce the tail water into the algae pond, and use the microalgae to absorb nitrogen and phosphorus nutrients in the water to purify the water;

[0011] Step 4: Discharge the purified algae water directly into the sedimentation tank;

[0012] Step 5: Collect the solid waste formed after tail water treatment and mix it with microalgae water;

[0013] Step 6: Construct a vermicomposting system;

[0014] Step 7: Place the pre-treated solid waste into the vermicomposting bed, where earthworms decompose the organic waste to produce vermicompost.

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

[0016] Preferably, the microalgae processing system comprises:

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

[0018] Active algae pool: used to increase the density of microalgae and enhance the absorption efficiency of nitrogen and phosphorus;

[0019] Fixed algae pool: fix the microalgae on the carrier to further purify the tail water.

[0020] Preferably, the earthworm composting system comprises:

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

[0022] Regularly replenish 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.

[0023] Preferably, 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.

[0024] Preferably, the earthworms can efficiently decompose solid wastes through amylase, cellulase and protease secreted in their intestines, and convert them into nutrient-rich earthworm castings.

[0025] Preferably, in the earthworm composting system, the compost bed is regularly turned 1 to 2 times a week to increase ventilation and ensure uniform oxygen supply.

[0026] Preferably, the temperature range of the earthworm composting bed is 15° C. to 25° C., and the humidity range is 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 the best purification effect.

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

[0029] The present invention provides a method for treating aquaculture solid waste based on ecology and resource recycling. It has the following beneficial effects:

[0030] 1. The present invention purifies tail water through a microalgae treatment system, which effectively removes pollutants such as nitrogen and phosphorus in the water, so that the treated water can be recycled and reused in the aquaculture system. This not only reduces the consumption of fresh water resources, but also reduces the pollution of aquaculture to the environment, and significantly improves the utilization efficiency of water resources.

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

[0032] 3. The microalgae treatment and vermicomposting technologies used in the present invention are both biological treatment methods in natural ecosystems, which are environmentally friendly and have no secondary pollution. Microalgae absorb nutrients in tail water through photosynthesis and release oxygen, which helps to improve water quality. The vermicomposting process uses the natural decomposition ability of earthworms to convert organic waste into nutrient-rich vermicompost. Both do not rely on chemical treatment, reduce the use of chemical agents, and protect the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a flow chart of the method of the present invention; DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example:

[0036] Please see attached Figure 1 The embodiment of the present invention provides a method for treating aquaculture solid waste based on ecology and resource recycling, comprising the following steps:

[0037] Step 1: Breeding microalgae strains that can tolerate high pollution conditions;

[0038] In the present invention, we selected a microalgae strain that tolerates highly polluted conditions, mainly Scenedesmus obli quus. This microalgae can survive under conditions of ammonia nitrogen concentrations as high as 300 mg / L, and has good growth ability between pH values ​​of 8 and 12. In addition, Scenedesmus obli quus has an absorption capacity of phosphates of up to 2.5 mg / L / d. These characteristics make it an ideal choice for treating highly polluted tail water.

[0039] Scenedesmus obli quus was selected as the microalgae strain, which was cultured and domesticated in the laboratory to enable it to grow stably under highly polluted conditions. Specifically, the microalgae strain has the following characteristics:

[0040] Tolerance to high ammonia nitrogen concentration: It can still grow normally at an ammonia nitrogen concentration of 300 mg / L.

[0041] Tolerant to high pH range: Suitable for environments with pH between 8 and 12.

[0042] High phosphate absorption capacity: daily phosphate absorption capacity exceeds 2.5 mg / L / d.

[0043] The domesticated Scenedesmus ob li quus has the ability to grow stably under extreme pollution conditions, ensuring the efficient absorption of nutrients such as nitrogen and phosphorus in tail water treatment, thereby effectively reducing the risk of eutrophication of water bodies.

[0044] Step 2: construct a comprehensive treatment system for microalgae and bacterial algae clusters;

[0045] A multi-stage microalgae treatment system was built to ensure that nutrients such as nitrogen and phosphorus in the tail water can be effectively absorbed. The system mainly consists of the following three parts:

[0046] Algae pond: used for large-scale cultivation of Scenedesmus obliquus. The algae pond is equipped with suitable 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 replenishing nutrients and adjusting the water flow rate, ensure that the microalgae remain highly active in the active algae pool.

[0048] Fixed algae pool: Fix Scenedesmus obliquus on a carrier so that it can further purify the tail water. The fixed microalgae can not only effectively absorb pollutants in the tail water, but also produce oxygen through photosynthesis, further improving the water quality. Scenedesmus obliquus is encapsulated in algae beads, which are usually formed by mixing algae and a natural or synthetic polymer material (such as sodium alginate and calcium chloride). These materials form a colloid in the water that can fix the microalgae in it. This method can not only maintain the activity of the microalgae, but also fix it in the water, thereby improving its treatment effect.

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

[0050] Step 3: introduce the tail water into the algae pond, and use the microalgae to absorb nitrogen and phosphorus nutrients in the water to purify the water;

[0051] The tail water is introduced into the algae pond, where the microalgae absorb nutrients such as nitrogen and phosphorus in the water through photosynthesis, reducing the chemical oxygen demand (COD) and biochemical oxygen demand (BOD).

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

[0053] Step 4: Discharge the purified algae water directly into the sedimentation tank;

[0054] There is no need to separate the microalgae. The purified algae water can be directly discharged into the sedimentation tank and combined with the subsequent solid waste treatment.

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

[0056] Step 5: Collect the solid waste formed after tail water treatment and mix it with microalgae water;

[0057] Solid waste settled in the sedimentation tank, including feed residues and fish and shrimp feces, is collected and mixed 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 can be increased, and its carbon-nitrogen ratio can reach a range suitable for earthworm treatment, laying a good foundation for earthworm treatment.

[0059] Step 6: Construct a vermicomposting system;

[0060] Construct a vermicomposting bed and provide suitable temperature, humidity and ventilation conditions to promote the growth and reproduction of earthworms. The temperature is controlled at 15℃ to 25℃ and the humidity range is 60% to 80%.

[0061] By constructing a suitable vermicomposting environment, we ensure that earthworms can efficiently decompose solid waste under optimal conditions and produce high-quality vermicompost.

[0062] Step 7: Place the pre-treated solid waste into the vermicomposting bed, where earthworms decompose the organic waste to produce vermicompost.

[0063] The pre-treated solid waste is placed in the vermicomposting bed. The earthworms secrete amylase, cellulase and protease in their intestines to decompose the organic waste and convert it into nutritious vermicompost. The compost bed is turned over 1 to 2 times a week to increase ventilation.

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

[0065] In the vermicomposting system, the compost bed should be turned over regularly 1 to 2 times a week to increase ventilation and ensure uniform oxygen supply.

[0066] In order to increase the ventilation and oxygen supply in the compost bed, the compost bed should be turned regularly 1-2 times a week. This operation can ensure that the organic matter in the compost bed is evenly distributed, avoid local hypoxia, and thus improve 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 vermicomposting system, temperature and humidity are two key factors. The temperature of the compost 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 the rapid decomposition of organic waste.

[0069] The density of microalgae in the microalgae treatment system 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 and 10^8 cells per liter of water. This density range ensures the best purification effect of the microalgae. In addition, by using photoperiod control technology to simulate natural lighting conditions, the photosynthesis efficiency and nutrient absorption capacity of the microalgae are further optimized.

[0071] Embodiment 1:

[0072] Step 1: Breeding microalgae strains that tolerate high pollution conditions

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

[0074] Step 2: Constructing a comprehensive treatment system for microalgae and bacterial algae clusters

[0075] Construct a microalgae treatment system including algae ponds, active algae pools and immobilized algae pools.

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

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

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

[0079] Step 3: Direct tailwater into the algae pond

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

[0081] Step 4: The purified algae water is discharged into the sedimentation tank. The water in the sedimentation tank is kept still for 30 minutes before being discharged.

[0082] Step 5: Collect solid waste and mix 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 6: Build a vermicomposting system

[0085] The vermicomposting bed was maintained at a temperature of 20°C and a humidity of 70%.

[0086] Step 7: Place the pre-treated solid waste into the vermicomposting bed and replenish the solid waste and microalgae water mixture once a week.

[0087] Example 2: Step 1: Breeding microalgae strains that tolerate high pollution conditions

[0088] The characteristics of Scenedesmus obliquus were the same as those of Example 1.

[0089] Step 2: Constructing a comprehensive treatment system for microalgae and bacterial algae clusters

[0090] Algae pond: light intensity 6000l ux, ventilation rate 2.5L / min.

[0091] Active algae pool: The density of microalgae reaches 10^8 cells / L.

[0092] Immobilized algae pond: microalgae are fixed on a nylon mesh fiber matrix.

[0093] Step 3: Direct tailwater into the algae pond

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

[0095] Step 4: The purified algae water is discharged into the sedimentation tank

[0096] The water in the sedimentation tank is kept still for 45 minutes before being discharged.

[0097] Step 5: Collect solid waste and mix with microalgae water

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

[0099] Step 6: Build a vermicomposting system

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

[0101] Step 7: Place the pre-treated solid waste into the vermicomposting bed and replenish the solid waste and microalgae water mixture twice a week.

[0102] Example 3: Example of optimizing earthworm composting bed conditions

[0103] Step 1: Breeding microalgae strains that tolerate high pollution conditions

[0104] The characteristics of Scenedesmus obliquus were the same as those of Example 1.

[0105] Step 2: Constructing a comprehensive treatment system for microalgae and bacterial algae clusters

[0106] Algae pond: light intensity 5000l ux, ventilation rate 2L / min.

[0107] Active algae pool: the density of microalgae reaches 10^7 cells / L.

[0108] Immobilized algae pool: microalgae are fixed on polyacrylamide microcarriers.

[0109] Step 3: Direct tailwater into the algae pond

[0110] Tail water flow rate: 5L / min, nitrogen content in water: 80mg / L, phosphorus content: 5mg / L.

[0111] Step 4: The purified algae water is discharged into the sedimentation tank

[0112] The water in the sedimentation tank is kept still for 30 minutes before being discharged.

[0113] Step 5: Collect solid waste and mix it with microalgae water. The solid waste / microalgae water mass ratio is 2:1.

[0114] Step 6: Build a vermicomposting system

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

[0116] Step 7: Place the pre-treated solid waste into the vermicomposting bed, add the solid waste and microalgae water mixture once a week, and turn the composting bed twice.

[0117] Step 1: Breeding microalgae strains that tolerate high pollution conditions

[0118] The characteristics of Scenedesmus obliquus were the same as those of Example 1.

[0119] Step 2: Construct an algae pond with an integrated treatment system for microalgae and bacterial algae clusters: light intensity 7000 l ux, ventilation rate 2.5 L / min.

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

[0121] Fixed algae pond: microalgae are fixed on porous expanded clay.

[0122] Step 3: Introduce tail water into the algae pond. Tail water flow rate: 6L / min, nitrogen content in water: 120mg / L, phosphorus content: 10mg / L. Step 4: Discharge the purified algae water into the sedimentation tank

[0123] The water in the sedimentation tank is kept still for 30 minutes before being discharged.

[0124] Step 5: Collect solid waste and mix it with microalgae water. The solid waste / microalgae water mass ratio is 3:2.

[0125] Step 6: Build a vermicomposting system

[0126] The vermicomposting bed was maintained 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: Optimization of carbon-nitrogen ratio

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

[0130] The characteristics of Scenedesmus obliquus were the same as those of 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] The water in the sedimentation tank is kept still for 30 minutes before being discharged.

[0136] Step 5: Collect solid waste and mix 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 experiment is 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, quantity and quality of earthworms. The data are shown in the following table:

[0147] project 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 Solid waste conversion rate (%) 90 60 Initial number of earthworms (pieces) 1000 - Final number of earthworms 1500 - Worm castings production (kg) 80 -

[0148] Experimental data show that the method of the present invention (experimental group) is significantly better than the traditional method (control group) in treating the nitrogen and phosphorus content of water bodies. At the same time, the conversion rate of solid waste and the output of earthworm castings also show that the method of the present invention has a 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 invention has significant advantages in environmental protection and resource utilization.

[0149] Example 6: Example of comprehensive treatment of tail water by bacterial algae group

[0150] Step 1: Breeding microalgae strains that tolerate high pollution conditions

[0151] Scenedesmus obli quus was selected and bred, which can tolerate high ammonia nitrogen concentration of 300 mg / L, adapt to the pH range of 8-12, and has a phosphate absorption capacity of 2.5 mg / L / d.

[0152] Step 2: Breeding strains that efficiently degrade organic matter

[0153] Select and breed a strain that can efficiently degrade organic matter, such as nitrifying bacteria (N itrosomonas sp.) and denitrifying bacteria (Pseudomonas sp.), to enhance the ability to decompose organic matter.

[0154] Step 3: Construct a comprehensive treatment system for bacterial and algal clusters

[0155] Algae pond: used for large-scale cultivation of Scenedesmus obliquus, with light intensity of 5000l ux and ventilation rate of 2L / min.

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

[0157] Immobilized algae pool: The microalgae are fixed in algae beads formed by sodium alginate and calcium chloride.

[0158] Bacteria-algae mixed pool: The selected high-efficiency strains are mixed with Scenedesmus obliquus to form a bacteria-algae cluster.

[0159] Step 4: Lead tailwater into the algae pond

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

[0161] Step 5: Introduce bacteria and algae mixing pool for comprehensive treatment

[0162] In the bacteria-algae mixed pool, microalgae absorb nitrogen and phosphorus nutrients in the water, while efficient strains degrade organic matter. The bacteria-algae clusters interact with each other to improve the treatment efficiency.

[0163] Step 6: Discharge the purified algae water directly into the sedimentation tank

[0164] The sedimentation tank keeps the water still for 30 minutes before discharging to remove suspended particles.

[0165] Step 7: Collect the solid waste formed after the tail water treatment and mix it with the microalgae water. Mix the treated solid waste with the microalgae water at a solid waste / microalgae water mass ratio of 2:1.

[0166] Step 8: Build a vermicomposting system

[0167] The vermicomposting bed was maintained at a temperature of 20°C and a humidity of 70%.

[0168] Step 9: Place the pre-treated solid waste into the vermicomposting bed

[0169] The solid waste and microalgae water mixture was replenished once a week.

[0170] Comparative Experimental Design

[0171] Experimental conditions:

[0172] Experimental group: using the comprehensive treatment method of bacteria and algae (Example 6)

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

[0174] Experimental period: 30 days

[0175] Experimental data collection: nitrogen and phosphorus content in water, organic matter content, efficiency of solid waste conversion into organic fertilizer, and the number and quality of earthworms.

[0176] Experimental data table:

[0177]

[0178]

[0179] The experimental data showed that the experimental group using the combined treatment method of bacteria and algae was significantly better than the control group using only microalgae in treating nitrogen, phosphorus and organic matter in water. In addition, the conversion rate of solid waste and the output of earthworm manure were also higher than those of the control group, and the increase in the number of earthworms further proved the effectiveness of the treatment method of bacteria and algae. In summary, the combined treatment method of bacteria and algae has significant advantages in environmental protection and resource utilization.

[0180] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended 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: Breeding microalgae strains that can tolerate high pollution conditions; Step 2: construct a comprehensive treatment system for microalgae and bacterial algae clusters; Step 3: introduce the tail water into the algae pond, and use the microalgae to absorb nitrogen and phosphorus nutrients in the water to purify the water; Step 4: Discharge the purified algae water directly into the sedimentation tank; Step 5: Collect the solid waste formed after the tail water treatment and mix it with the microalgae water; Step 6: Construct a vermicomposting system; Step 7: 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 to 12, and a phosphate absorption capacity of 2.5 mg / L / d.

3. The method for treating aquaculture solid waste based on ecology and resource recycling according to claim 1, characterized in that: The microalgae processing system comprises: 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.

4. The method for treating aquaculture solid waste based on ecology and resource recycling according to claim 1, 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 replenish 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.

5. The method for treating aquaculture solid waste based on ecology and resource recycling according to claim 1, 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.

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

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

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

9. The method for treating aquaculture solid waste based on ecology and resource recycling according to claim 1, characterized in that: The density of the microalgae in the microalgae treatment system is controlled at 10^6 to 10^8 cells per liter of water to ensure the best purification effect.

10. The method for treating aquaculture solid waste based on ecology and resource recycling according to claim 1, characterized in that: The photoperiod control technology is used in the microalgae processing system to simulate natural lighting conditions to optimize the photosynthesis efficiency and nutrient absorption capacity of the microalgae.

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