A sewage treatment fruit shell nutrient release system and method

Abstract

The application discloses a kind of sewage treatment fruit shell nutrient release system and method, belong to water treatment technical field.The system of the application includes initial release pool, deep release pool, chemical release pool and pulverizer, inlet and outlet pipe.The annular groove is surrounded by inner ring wall and outer wall in initial release pool, release frame is placed therein, and plant fruit shell is loaded in release frame;Initial release pool is provided with turnover plate, which drives release frame to roll.Deep release pool is built-in release barrel, and powder fruit shell is loaded in release barrel.Chemical release pool includes treatment box, treatment pool, and treatment pool is divided into inner pool and outer pool.Pulverizer is arranged between initial release pool and deep release pool.COD detector is installed at the outlet of initial release pool, deep release pool and chemical release pool, and outlet water is collected in nutrient pool.Fruit shell nutrient release steps include: operation preparation, release operation, promote release, fruit shell crushing, deep release and treatment release.The application not only can maximize the use of agricultural waste fruit shell nutrition, but also can conveniently control nutrient addition concentration and improve nutrient solution quality.

Description

Technical Field

[0001] This invention belongs to the field of water treatment technology, and more specifically, relates to a wastewater treatment system and method for releasing nutrients from fruit shells. Background Technology

[0002] Most urban wastewater treatment plants contain NO3. - High N-nitrification concentrations and poor denitrification efficiency are problems that wastewater treatment plants urgently need to address due to increasingly stringent standards. Reducing total nitrogen (TNO) in effluent has become a critical issue for wastewater treatment plants. Removing TNO requires supplementing carbon sources. Currently, widely used external carbon sources include liquid and solid sources. Liquid carbon sources include methanol, ethanol, glucose, sodium acetate, and sucrose, but these are costly, have some toxicity, and are difficult to transport. Solid carbon sources are mainly synthetically produced poly(β-hydroxybutyric acid), polyhydroxyalkanoates, polylactic acid, and polycaprolactone, which are easily biodegradable and have high denitrification efficiency, but also have drawbacks such as high price and high wastewater treatment operating costs. In recent years, agricultural waste (such as straw, corn cobs, and fruit shells) has gradually become a research hotspot for external carbon sources due to its easy availability and low cost. Among them, plant shells are rich in natural cellulose, which not only has good biocompatibility but is also easily biodegradable, making them an ideal external nutrient source to supplement carbon and enhance denitrification.

[0003] However, the nutrient release rate from fruit shells is slow and the release time is long. Directly adding fruit shells to wastewater treatment structures would significantly reduce the effective treatment volume and the amount of water that can be treated. The nutrient release rate is uneven, with a rapid initial release of large quantities followed by a slow, very small release later, failing to meet the needs of balanced nutrition in production. Furthermore, some nutrients within the fruit shell structure are difficult to fully release, resulting in low utilization of the nutritional value. Therefore, to effectively utilize the nutrients in plant fruit shells, it is essential to develop nutrient release devices suitable for plant fruit shells.

[0004] A search revealed existing patents related to wastewater treatment nutrient release devices, such as Chinese Patent No. CN212425555U, which discloses a nutrient release device consisting of a sealed main container with multiple slow-release through-holes on its outer wall. The carbon source dissolves in the wastewater through these through-holes, ensuring uniform carbon source distribution. However, this device has a small volume and is suitable for the rapid release (in minutes or hours) of chemical products, but not for the slow release of nutrients from fruit shells (in days or months).

[0005] For example, Chinese patent number CN215667316U discloses a high-efficiency carbon source release device for sewage treatment. An impeller motor at the top of a rectangular box drives the blades to rotate, increasing the water flow rate and accelerating the dissolution of solid carbon sources. However, this device is only suitable for releasing carbon sources with no residue and good solubility, and is not suitable for releasing nutrients from plant shells with large amounts of residue.

[0006] For example, Chinese Patent No. CN114716011B discloses a high-efficiency denitrification device with self-enhanced solid nutrient release. It makes full use of the nitrogen pulse generated by the reaction in the anaerobic ammonia oxidation zone to enhance the agitation of the solid carbon source in the device by the fluid and improve the release efficiency of the carbon source. However, since the anaerobic ammonia oxidation reaction is slow and easily affected by many environmental factors, it is not easy to control the continuous release of nutrients, and the quality of the carbon source cannot be controlled, making it difficult to meet the needs of wastewater treatment. Summary of the Invention

[0007] 1. The technical problem that the invention aims to solve

[0008] To address the problem that existing devices cannot effectively and fully utilize the nutrients in agricultural waste such as fruit shells, and cannot effectively control the concentration and quality of nutrient release from plant fruit shells to meet the needs of wastewater treatment, this invention provides a wastewater treatment fruit shell nutrient release system and method. This invention can perform extrinsic release of nutrients from fruit shells, providing good nutrient quality.

[0009] 2. Technical Solution

[0010] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0011] A wastewater treatment nutrient release system for fruit shells includes a primary release tank, a deep release tank, a chemical release tank, and a matching crusher and inlet / outlet pipes.

[0012] As a further improvement of the present invention, the initial release tank is provided with an inner ring wall, which has perforations. The inner ring wall and the tank wall of the initial release tank form an annular groove, in which multiple release frames of the same or different specifications are placed. A flipping plate is provided above the annular groove.

[0013] As a further improvement of the present invention, a first motor connected to a stirring shaft is provided on the initial release tank.

[0014] As a further improvement of the present invention, the release frame has release holes with a diameter smaller than that of the nut shell particles distributed on its frame, and multiple rollers extend radially from the frame.

[0015] As a further improvement of the present invention, a second fixed beam is provided at the top of the deep release tank, on which a second motor is mounted, and a hanging rod is fixed on the output shaft of the second motor. Eight to ten hanging rods are arranged circumferentially around the output shaft of the second motor, and the release tank is suspended from the end of the hanging rod.

[0016] As a further improvement of the present invention, the release bucket includes a cover plate and a bucket body. The cover plate is provided with a lifting ring, and the bucket body is distributed with release holes with a diameter smaller than that of the fruit shell particles. An inner bag is fixed inside the bucket body, and the inner bag is made of filter cloth.

[0017] As a further improvement of the present invention, the chemical release pool consists of a treatment tank and a treatment pool. The treatment tank is a cuboid for placing the chemical agent barrels; the treatment pool includes an inner pool, an outer pool and a circulation pump, and small holes are opened on the bottom plate of the inner pool.

[0018] As a further improvement of the present invention, the crusher is arranged between the initial release pool and the deep release pool, and COD detectors are installed at the water outlets of the initial release pool, the deep release pool and the chemical release pool.

[0019] As a further improvement of the present invention, the method for the system to carry out the nutrient release of fruit shells includes the following steps:

[0020] S1: Operation preparation. Load one or more kinds of plant fruit shells into the release frame, and place the release frame into the annular groove;

[0021] S2: Release operation. Tap water flows into the initial release pool to soak the fruit shells in the release frame, and the nutrients in the fruit shells are released into the water;

[0022] S3: Promote release. Start the first motor to drive the stirring shaft to rotate, stir the internal water flow of the initial release pool to promote the release of fruit shell nutrients; drive the turning plate to拨动 the release frame to roll, and the nutrient solution released by the fruit shells flows out and is stored in the nutrient pool;

[0023] S4: Fruit shell crushing. When the COD concentration of the nutrient solution in the initial release pool is stable at a low value, move the release frame out of the initial release pool and transport it above the crusher, and pour the fruit shells into the crusher for crushing;

[0024] S5: Deep release. Load the fruit shell powder into the release barrel, tap water flows into the deep release pool, start the second motor to drive the hanging rod to带动 the release barrel to rotate horizontally, and the fruit shell powder continues to release nutrients into the water, and the nutrient solution flows out and is stored in the nutrient pool;

[0025] S6: Treatment release. When the COD concentration of the nutrient solution in the deep release pool is stable at a low value, lift the release barrel and place it in the chemical agent barrel added with chemical agents for treatment. After drying the treated release barrel, put it into the inner pool, and continue to soak with water inlet. The nutrient solution enters the outer pool through the small holes in the bottom plate, is lifted back to the inner pool by the circulation pump, circulates, and the nutrient solution flows out to the nutrient pool.

[0026] 3. Beneficial effects

[0027] Adopting the technical solution provided by the present invention, compared with the existing well-known technologies, it has the following remarkable effects:

[0028] (1) The sewage treatment nutrient release system of the present invention is provided with an initial release pool and a deep release pool, which can carry out the nutrient release of fruit shells with different particle sizes; a chemical release pool is provided, and through chemical agent treatment, the nutrients in the fruit shells are fully and thoroughly released, realizing the maximization of the nutritional utilization value of the fruit shells.

[0029] (2) The sewage treatment nutrient release system of the present invention can place different numbers of release frames or release barrels in the initial release pool or deep release pool, and load different types of fruit shells or mix different types of fruit shells in different quantities and proportions in different release frames, which can control the quality of the released nutrients and better meet the nutrient requirements for sewage treatment.

[0030] (3) The sewage treatment nutrient release system of the present invention can change the water flow movement speed in the initial release pool, deep release pool, and chemical release pool by changing the motor speed and the flow rate of the circulation pump, so as to control the nutrient release rate and has operational flexibility.

[0031] (4) The turning plate in the sewage treatment nutrient release system of the present invention拨动释放框滚动,使得释放框内果壳间歇翻动,可避免果壳结块;内袋固定在释放桶体上保持固定形态,果壳粉末在袋内可自由随水飘动,不易结块,提高营养释放均匀性、充分性。(The turning plate in the sewage treatment nutrient release system of the present invention拨动释放框滚动,使得释放框内果壳间歇翻动,可避免果壳结块;内袋固定在释放桶体上保持固定形态,果壳粉末在袋内可自由随水飘动,不易结块,提高营养释放均匀性、充分性。The turning plate in the sewage treatment nutrient release system of the present invention rolls the release frame, causing the fruit shells in the release frame to turn intermittently, which can prevent the fruit shells from caking; the inner bag is fixed on the release barrel body to maintain a fixed shape, and the fruit shell powder can freely float with the water in the bag, making it not easy to cake, and improving the uniformity and sufficiency of nutrient release.) Description of the Drawings

[0032] Figure 1 is the top view of the fruit shell nutrient release system for sewage treatment of the present invention;

[0033] Figure 2 is the longitudinal sectional structure diagram of the initial release pool of the present invention:

[0034] Figure 3 and Figure 4 are respectively the longitudinal sectional and top plane structure diagrams of the release frame of the present invention:

[0035] Figure 5 is the longitudinal sectional structure diagram of the deep release pool of the present invention;

[0036] Figure 6 is the longitudinal sectional structure diagram of the release barrel of the present invention;

[0037] Figure 7 is the longitudinal sectional structure diagram of the chemical release pool of the present invention.

[0038] Explanation of the reference numerals in the schematic diagrams:

[0039] It should be noted that there is an unclear expression "拨动释放框滚动" in the text of item (4). It is recommended to check and correct it to ensure the accuracy of the translation. The above translation is for reference only.1. Initial release tank; 11. First motor; 12. Stirring shaft; 13. First fixed beam; 14. Support frame; 15. Tilting plate; 16. Water outlet trough; 17. Inner ring wall; 18. Annular groove; 19. Release frame; 191. Top cover; 192. Release hole; 193. Roller foot; 194. Side ring; 2. Deep release tank; 21. Second motor; 22. Hanging rod; 23. Release bucket; 231. Cover plate; 232. Bucket body; 233. Inner bag; 234. Side hook; 24. Second fixed beam; 25. Water collection trough; 3. Chemical release tank; 31. Inner tank; 311. Bottom plate; 32. Outer tank; 33. Circulation pump; 34. Treatment box; 35. Chemical tank; 4. Crusher; 5. COD detector; 61. Inlet pipe; 62. Outlet pipe; 63. Nutrient tank; 64. Main outlet pipe. Detailed Implementation

[0040] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] The present invention will be further described below with reference to embodiments.

[0042] Example 1

[0043] Referring to the accompanying drawings, this embodiment of a wastewater treatment nutrient release system includes a primary release tank 1, a deep release tank 2, a chemical release tank 3, and supporting components such as a pulverizer 4, a COD analyzer 5, and inlet and outlet pipes. The inlet pipe 61 connects to the primary release tank 1, deep release tank 2, and chemical release tank 3, while the outlet pipe 62 connects to the primary release tank 1, deep release tank 2, chemical release tank 3, and a nutrient tank 63. The nutrient tank 63 is connected to a main outlet pipe 64. The COD analyzer 5 is installed at the outlet of the primary release tank 1, deep release tank 2, and chemical release tank 3 to monitor the concentration and changes of the nutrient solution in each release tank.

[0044] It is worth noting that in this embodiment, fruit shells from different processing stages are placed sequentially in the initial release tank 1, the deep release tank 2, and the catalytic release tank 3 to release nutrients at different stages. Although the overall order from the initial release tank 1 to the catalytic release tank 3 remains unchanged, users can flexibly choose any release tank as the starting point for processing based on the texture and properties of the fruit shells.

[0045] like Figure 2As shown, the initial release tank 1 is cylindrical, with an annular outlet groove 16 on the top inner side of the outer wall. An inner annular wall 17 with perforations divides the initial release tank 1 into inner and outer parts. The outer part is an annular groove 18 formed by the tank wall and the inner annular wall 17, while the inner part is a stirring zone. 16-20 release frames 19 are symmetrically and equidistantly placed in the annular groove 18. A first fixed beam 13 is provided on the top wall of the initial release tank 1, on which a first motor 11 is installed, and a stirring shaft 12 is fixed below its output shaft. A flipping plate 15 is provided above the annular groove 18. Driven by the first motor 11, the flipping plate 15 can rotate the release frames 19 within the annular groove 18. In practice, the drive motor for the flipping plate 15 can be separate or share the first motor 11. Specifically, in this embodiment, a support frame 14 is connected to the output shaft below the first motor 11, and a flipping plate 15 is fixed to each end of the support frame 14.

[0046] like Figure 3 and Figure 4 As shown, the release frame 19 is frustum-shaped with an openable top cover 191. Release holes 192 are evenly distributed throughout the release frame 19, with a diameter smaller than the fruit shell particle size (5-10 mm). Rollers 193 of a certain length extend from the top and bottom edges of the release frame 19, rolling within the annular groove 18. The circumference of the top roller 193 is smaller than that of the bottom roller 193, ensuring that the release frame 19 can continuously roll within the track of the annular groove 18 without getting stuck. Two side rings 194 are provided on one side of the release frame 19 for easy removal from the initial release tank 1. Different release hole diameters (4 mm, 5 mm, 6 mm, 7 mm, 8 mm) create release frames of different specifications.

[0047] The flipping plate 15 is rectangular, with a width slightly smaller than that of the annular groove 18, and a vertical pole in the middle connected to the support frame 14.

[0048] like Figure 5 As shown, the deep release tank 2 has a cylindrical structure, with an annular water collection trough 25 located on the upper inner side of the tank wall. A second fixing beam 24 is fixed along the diameter of the tank wall, and a second motor 21 is installed on the second fixing beam 24. Eight to ten hanging rods 22 in the diameter direction are fixed on the output shaft of the second motor 21, and a release bucket 23 is suspended from each hook at both ends of the hanging rods.

[0049] It is worth noting that, in order to increase the lateral and longitudinal disturbance of the water flow and promote nutrient release, a design similar to the primary release tank 1 can be adopted, with a separate motor and stirring shaft. Alternatively, a stirring shaft can be installed on the output shaft of the second motor 21 to improve the nutrient release effect through stirring.

[0050] like Figure 6As shown, the release bucket 23 is cylindrical and has a flip-open cover 231 with a lifting ring. The bucket body 232 of the release bucket 23 is covered with release holes with a diameter of 3-5mm. An arc-shaped side hook 234 is provided on one side of the lower part of the bucket body 232. An inner bag 233 made of high-strength filter cloth is fixed to the inner wall of the bucket, and the bag opening has a drawstring.

[0051] like Figure 7 As shown, the chemical release tank 3 consists of a treatment box 34 and a treatment pool. The treatment box 34 can hold multiple reagent containers 35 for storing chemical reagents, and a release container 23 containing fruit shells is placed inside the reagent container 35. The treatment pool is divided into an inner pool 31 and an outer pool 32. The bottom wall 311 of the inner pool 31 has evenly distributed water passage holes, and the bottom plate 311 is separated from the bottom of the outer pool. The release container 23 containing fruit shells is placed in the inner pool 31. A circulation pump 33 is installed at the top of the outer pool 32, and the circulation pump 33 completes the circulation of water between the inner pool 31 and the outer pool 32.

[0052] The crusher 4 is placed in front of the deep release tank 2. A flexible hose is fitted on the discharge port of the crusher, and the flexible hose extends into the release tank 23 of the deep release tank 2.

[0053] To achieve a stable nutrient release concentration, the following steps are involved in using peanut shells for nutrient release in wastewater treatment:

[0054] S1: Operation Preparation. Place peanut shells with a particle size of 8±1mm into the release frame 19 with a 6mm aperture, achieving a 90% filling rate and leaving 10% space for movement. Load a total of 16 release frames 19. After covering with the top cover 191, use the side ring 194 to sequentially and symmetrically place the 16 release frames 19 into the annular groove 18.

[0055] S2: Release Operation. Open the inlet valve, and tap water in the inlet pipe 61 flows into the primary release tank 1. The hydraulic retention time is 12 hours. After the peanut shells in the release frame 19 are soaked in tap water, they release nutrients into the water, and the inlet water becomes a nutrient solution. Open the outlet valve to keep the water level in the primary release tank 1 stable, and the water flows into the nutrient tank 63 for storage through the outlet pipe 62.

[0056] S3: Promote Release. The first motor 11 on the first fixed beam 13 of the initial release tank 1 drives the stirring shaft 12 to rotate. In this embodiment, the stirring shaft 12 uses a three-impeller design. The upper and lower blades are large, resulting in a large disturbance radius; the middle blade is small, resulting in a small disturbance radius, creating a longitudinal density gradient. This forms simultaneous transverse and longitudinal hydraulic circulation, increasing turbulence and better promoting nutrient release from the peanut shells and homogenizing the water quality. The first motor 11 rotates at 10 revolutions per minute. Simultaneously, the first motor 11 drives the flipping plates 15 at both ends of the support frame 14 to rotate, symmetrically actuating the rollers 193 of the two release frames 19, causing the release frames 19 to roll forward and agitate the peanut shells inside, preventing clumping. After 2 hours, the COD concentration of the nutrient solution is 821.55 mg / L, and after 24 hours it reaches 993.47 mg / L, far exceeding the nutrient concentration required for wastewater treatment (COD concentration 200-300 mg / L).

[0057] S4: Peanut Shell Crushing. After 4 days, the COD concentration in the primary release tank 1 stabilized at a low value (162.56±10.23mg / L), indicating that the peanut shells could no longer release more nutrients. The release frame 19 was removed, and the top cover 191 was opened to pour the peanut shells into the crusher 4 for crushing. The crushed powder (particle size 0.5-1.0mm) automatically flowed through the outlet hose into the 5mm diameter release bucket 23 inside the deep release tank 2. The inner bag 233 was tied tightly, and the cover plate 231 was closed. The peanut shells in the 16 release frames 19 in the primary release tank 1 were crushed sequentially. The second motor 21 drove the hanging rod 22 to rotate and move the release bucket 23, loading the peanut shell powder sequentially.

[0058] S5: Deep Release. Open the inlet valve of the deep release tank. After the water level is higher than the release tank 23, open the outlet valve of the deep release tank to maintain the water level in the deep release tank 2. The hydraulic retention time is 12 hours. Operate the second motor 21 on the deep release tank 2 to drive the hanging rod 22 to rotate the release tank 23 at a speed of 20 revolutions per minute. The peanut shell powder continues to release nutrients at a deep level.

[0059] S6: Release Processing. When the COD concentration of the nutrient solution in the deep release tank 2 is very low (less than 20.00 mg / L), it indicates that the nutrient release from the peanut shells is complete. The release tank 23 is removed from the deep release tank 2 and placed in the treatment tank 34. A 2% NaOH solution is added to soak the peanut shell powder for 6 hours. The agent further chemically decomposes the powdered shells, improving the release performance of residual nutrients in the shells. Then, the release tank 23 is removed, dried, and placed in the inner tank 31 of the chemical release tank 3. Water is added for soaking, and the circulation pump 33 is started. Under the action of the continuously circulating water, the peanut shell powder continues to release nutrients. After 24 hours, the COD concentration is 80.28 mg / L, and the nutrient solution flows into the nutrient tank 63 through the return pipe.

[0060] The COD concentration of the nutrient solution after mixing in the nutrient tank was 210.54±19.28 mg / L, which met the requirements for nutrient addition in wastewater treatment and achieved thorough release of nutrients from plant shells and effective concentration control.

[0061] Example 2

[0062] The basic structure and operation steps of the system in this embodiment are similar to those in Embodiment 1. The difference is that, in order to adjust the nutrient ratio of the released nutrient solution, different release frames 19 are loaded with different plant shells.

[0063] In wastewater treatment, both excessively high and low COD / TN ratios in the nutrient solution can negatively impact treatment efficiency. To obtain a suitable COD / TN nutrient solution, two types of plant shells were selected: walnut shells (high carbon release, low nitrogen release) and apricot shells (low carbon release, high nitrogen release). Walnut shells with a particle size of 6±1 mm were placed in release frames 19 with a 5 mm aperture; apricot shells with a particle size of 5±1 mm were placed in release frames 19 with a 4 mm aperture, achieving a 90% filling rate for both types of shells. Eight release frames 19 were filled with walnut shells, and twelve with apricot shells. These release frames 19, filled with both types of shells, were alternately placed in the annular trough 18 of the primary release tank 1. After completing the operational steps, water samples were collected from the nutrient tank 63 for water quality analysis.

[0064] The results showed that the COD / TN ratios of the effluent from the walnut shell release solution in the primary release tank 1 and the deep release tank 2 were as high as 26.45 and 30.98, respectively, while the COD / TN ratios of the apricot shell release solution in the primary release tank 1 and the deep release tank 2 were 19.51 and 12.87, respectively, showing a significant difference. The COD / TN ratio of the nutrient solution in the nutrient tank 63 was 18.29, indicating that the quality of the nutrient solution released from the mixed fruit shells was improved, better meeting the nutritional requirements of wastewater treatment.

[0065] Example 3

[0066] The basic structure of the system in this embodiment is the same as that in Embodiment 1. Macadamia walnut shells are very hard, and the nutrient release rate of large-particle shells is very slow. Therefore, they are directly crushed to a particle size of 0.2-0.4 mm and put into a release tank with a release hole diameter of 3 mm. Nutrient release is carried out according to the S1, S4-S6 operation steps of Embodiment 1. The final COD concentration in the nutrient tank is 301.54±19.11 mg / L, which meets the nutrient addition requirements for wastewater treatment.

[0067] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A wastewater treatment system for releasing nutrients from fruit shells, characterized in that: It includes a primary release tank (1), a deep release tank (2), and a chemical release tank (3), with inlet and outlet water pipes connected to the primary release tank (1), the deep release tank (2), and the chemical release tank (3), respectively; a release frame (19) is set in the primary release tank (1), a release bucket (23) is set in the deep release tank (2), and a treatment box (34) and a treatment pool are set in the chemical release tank (3). Chemical agents are added to the treatment box (34), and the fruit shells are loaded into the release frame (19) and / or the release bucket (23), and are processed sequentially through the primary release tank (1), the deep release tank (2), the treatment box (34), and the treatment pool to release nutrients at different stages; The initial release tank (1) is provided with an inner ring wall (17) with perforations. The inner ring wall (17) and the tank wall of the initial release tank (1) form an annular groove (18). Multiple release frames (19) of the same or different specifications are placed in the annular groove (18). A flipping plate (15) is provided above the annular groove (18). The flipping plate (15) can be driven by a motor to make the release frames (19) flip in the annular groove (18). The release frame (19) has release holes (192) with a diameter smaller than that of the nut shell particles distributed on its frame, and multiple rollers (193) extend radially from the frame. The primary release tank (1) is equipped with a first motor (11) and a stirring shaft (12). The first motor (11) drives the stirring shaft (12) to rotate, thereby agitating the water flow inside the primary release tank (1). The deep release tank (2) is provided with a second fixed beam (24) at the top. The second motor (21) is installed on the second fixed beam (24). A hanging rod (22) is fixed on the output shaft of the second motor (21). The hanging rod (22) is provided with 8-10 rods along the circumference with the output shaft of the second motor (21) as the axis. The release tank (23) is suspended at the end of the hanging rod (22). The release bucket (23) includes a cover plate (231) and a bucket body (232). The cover plate (231) is provided with a lifting ring, and the bucket body (232) is provided with release holes with a diameter smaller than that of the fruit shell particles. An inner bag (233) is fixed inside the bucket body (232), and the inner bag (233) is made of filter cloth. The processing box (34) is equipped with multiple reagent tanks (35), and a release tank (23) containing fruit shells is placed in the reagent tank (35); The treatment pool includes an inner pool (31), an outer pool (32), and a circulation pump (33). The bottom plate (311) of the inner pool (31) has a hole. A release bucket (23) loaded with fruit shells is placed in the inner pool (31). The circulation pump (33) completes the circulation of water in the inner pool (31) and the outer pool (32). A pulverizer (4) is installed between the primary release tank (1) and the deep release tank (2); COD detectors (5) are installed at the outlets of the primary release tank (1), the deep release tank (2), and the chemical release tank (3).

2. A method for releasing nutrients from fruit shells using the system described in claim 1, characterized in that, Includes the following steps: S1: Place one or more plant husks into the release frame (19) and place the release frame (19) into the annular groove (18); S2: Tap water flows into the initial release tank (1) to soak the fruit shells in the release box (19), and the nutrients in the fruit shells are released into the water; S3: Start the first motor (11) to drive the stirring shaft (12) to rotate, stir the water flow inside the initial release tank (1) to promote the release of nutrients from the fruit shell; drive the flipping plate (15) to push the release frame (19) to roll, and the nutrient solution released from the fruit shell flows out for storage. S4: When the COD concentration of the nutrient solution in the initial release tank (1) is stable at a low value, the release box (19) is removed from the initial release tank (1) and transported to the top of the crusher (4), and the fruit shells are poured into the crusher (4) for crushing. S5: The fruit shell powder is loaded into the release tank (23), tap water flows into the deep release tank (2), the second motor (21) is started to drive the hanging rod (22) to drive the release tank (23) to rotate horizontally, the fruit shell powder continues to release nutrients into the water, and the nutrient solution flows out for storage; S6: When the COD concentration of the nutrient solution in the deep release tank (2) is stable at a low value, the release tank (23) is lifted and placed in the reagent tank (35) with added chemical agents for treatment. The treated release tank (23) is dried and placed in the inner tank (31). Water is added for further soaking. The nutrient solution enters the outer tank (32) through the small hole of the bottom plate (311) and is lifted back to the inner tank (31) by the circulation pump (33). The nutrient solution flows out and is stored.

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