A biogas slurry replenishment type soilless culture nutrient supply device

Abstract

The utility model belongs to the field of soilless culture technology, is a kind of biogas slurry supply type soilless culture fertilizer supply device. Including biogas slurry processing part and soilless culture part, biogas slurry processing part and soilless culture part are connected;Biogas slurry processing part includes first rack, first rack is divided into upper, middle, lower three layers of placing part from top to bottom, pre-sedimentation tank, concentrated nutrient solution mother liquor tank and biogas slurry collection tank are fixed in upper layer placing part, biogas slurry filter tank, acid tank, lye tank and water storage tank are fixed in middle placing part, nutrient solution blending tank, buffer disinfection tank and control cabinet are fixed in lower layer placing part;Soilless culture part includes second rack, and soilless culture device is provided on second rack. Solve the existing soilless culture device circulation process nutrient solution utilization rate is insufficient, pollution and other problems, and nutrient solution can be recycled and after disinfection treatment, can be adjusted according to the concentration of nutrient solution, pH change in the circulating system of nutrient solution, meet the growth demand of plant.

Description

Technical Field

[0001] This utility model relates to the field of soilless cultivation technology, specifically a biogas slurry replenishment type soilless cultivation fertilizer supply device. Background Technology

[0002] Soilless cultivation, as an innovative planting model in modern agriculture, has become an important development direction for facility agriculture due to its technological advantages such as saving labor, reducing water and fertilizer, increasing yield and quality, and reducing pests and diseases. Among them, nutrient solution is the key to soilless cultivation; the efficient utilization of nutrient solution is one of the key factors in the development of soilless cultivation technology. Existing efficient nutrient solution utilization systems are generally only slightly effective in large-scale applications such as greenhouses or plant factories, and it is difficult to apply them effectively in small, limited spaces.

[0003] With the increase in fertilizer use, especially the excessive use of nitrogen fertilizer, the quality of vegetables has declined, mainly manifested in the increase or even exceedance of nitrate content. However, biogas slurry treated anaerobicly has significant agricultural value. It is rich in nutrients, has a fast effect, is environmentally friendly, low in cost, and easy to apply, making it a high-quality fertilizer source for organic agriculture. Therefore, the innovative introduction of biogas slurry into soilless cultivation systems can create a new cultivation model that not only meets the standards for green food production but also achieves efficient conversion of waste resources. Currently, nutrient solutions are generally made by mixing chemical fertilizers, which is not conducive to the efficient utilization of fertilizers and nutrient solutions.

[0004] Therefore, there is an urgent need for a biogas slurry-replenished soilless cultivation fertilizer supply device to solve the above-mentioned technical problems. Utility Model Content

[0005] This invention aims to solve the above-mentioned problems by providing a biogas slurry-replenished soilless cultivation fertilizer supply device. It solves the problems of insufficient nutrient solution utilization and pollution in the circulation process of existing soilless cultivation devices. In this device, biogas slurry is used as the preferred fertilizer source, and chemical fertilizer is used as a supplementary nutrient element. The nutrient solution can be recycled and disinfected. The nutrient solution can be adjusted according to the concentration and pH changes of the nutrient solution delivered to the circulation system to meet the growth needs of plants.

[0006] The technical solution adopted by this utility model to solve the aforementioned problem is:

[0007] A biogas slurry-replenished soilless cultivation fertilizer supply device includes a biogas slurry treatment section and a soilless cultivation section, which are connected. The biogas slurry treatment section includes a first frame, which is divided into upper, middle, and lower storage sections from top to bottom. A pre-sedimentation tank is fixed on the left side of the upper storage section, and a biogas slurry filtration tank is fixed in the center of the middle storage section. The pre-sedimentation tank and the biogas slurry filtration tank are connected. A concentrated nutrient solution mother liquor tank and a biogas slurry collection tank are fixed on the right side of the upper storage section. The biogas slurry filtration tank and the biogas slurry collection tank are connected. A nutrient solution mixing tank is fixed in the center of the lower storage section. The concentrated nutrient solution mother liquor tank and the biogas slurry collection tank are connected to the nutrient solution mixing tank through a three-way pipe. An acid tank, an alkali tank, and a water storage tank are arranged and fixed in sequence on the left side of the middle storage section. All water tanks are connected to the nutrient solution preparation tank. A buffer disinfection tank is fixed on the right side of the lower storage section. The nutrient solution preparation tank and the buffer disinfection tank are connected. A control cabinet is fixed on the right side of the lower storage section. The control cabinet contains control equipment. A first solenoid valve is installed on the side of the three-way pipe near the nutrient solution preparation tank. The first solenoid valve is connected to the control equipment via a connecting line. The hydroponics section includes a second frame located to the right of the first frame. A hydroponics device is installed on the second frame. The buffer disinfection tank is connected to the hydroponics device. The hydroponics device is connected to the nutrient solution preparation tank. The height of the hydroponics device is higher than the height of the nutrient solution preparation tank. A water pump is installed in the nutrient solution preparation tank to pump the nutrient solution to the hydroponics device. The water pump is connected to the control equipment via a connecting line.

[0008] As a preferred embodiment, a further technical solution of this utility model is as follows:

[0009] Preferably, the acid tank and the nutrient solution mixing tank are connected via a first connecting pipe, the alkali tank and the nutrient solution mixing tank are connected via a second connecting pipe, and the water storage tank and the nutrient solution mixing tank are connected via a third connecting pipe. A second solenoid valve is installed on the first connecting pipe, a third solenoid valve is installed on the second connecting pipe, and a fourth solenoid valve is installed on the third connecting pipe. The second, third, and fourth solenoid valves are all connected to a control device via connecting lines. A first liquid switch is installed between the acid tank and the second solenoid valve on the first connecting pipe, a second liquid switch is installed between the alkali tank and the third solenoid valve on the second connecting pipe, and a third liquid switch is installed between the water storage tank and the fourth solenoid valve on the third connecting pipe.

[0010] Preferably, two sludge discharge holes are provided at the bottom of the pre-sedimentation tank, and a connection hole is provided on the right side of the pre-sedimentation tank. A first pipeline connected to the biogas slurry filter tank is connected to the connection hole, and a fourth liquid switch is provided on the first pipeline.

[0011] Preferably, the biogas slurry filtration tank includes a hollow, rectangular main shell. Inside the main shell, from top to bottom, there are filter cloth, a pebble filter layer, filter cloth, activated carbon filter cotton, filter cloth, a quartz sand filter layer, filter cloth, a screen, filter cloth, and a PPR support frame. The upper surface of the main shell and the filter cloth above the pebble filter layer are spaced apart, and the PPR support frame and the lower surface of the main shell are spaced apart. A first inlet hole is provided on the left side of the main shell, above the filter cloth and connected to a first pipeline. A liquid booster pump is provided below the PPR support frame. A first outlet hole is provided on the right side of the main shell, connected to the liquid booster pump. A second pipeline connected to the biogas slurry collection tank is connected to the first outlet hole.

[0012] Preferably, a second inlet hole connected to a second pipeline is provided on the biogas slurry collection tank, and a second outlet hole is provided on both the biogas slurry collection tank and the concentrated nutrient solution mother liquor tank. Both second outlet holes are connected to a three-way pipeline. A concentrated nutrient solution and biogas slurry mixture inlet connected to a three-way pipeline is provided on the nutrient solution mixing tank. A first solenoid valve is provided on the side of the three-way pipeline near the concentrated nutrient solution and biogas slurry mixture inlet.

[0013] Preferably, an acid-base sensor, a liquid level sensor, an EC sensor, an ultraviolet germicidal lamp, and a liquid stirrer are placed in the nutrient solution preparation tank, and the acid-base sensor, liquid level sensor, EC sensor, ultraviolet germicidal lamp, and liquid stirrer are all connected to the control equipment.

[0014] Preferably, the hydroponic device includes an upper series cylindrical pipe and a lower series cylindrical pipe fixed on a second frame. The upper series cylindrical pipe and the lower series cylindrical pipe are spaced apart and interconnected. Both the upper series cylindrical pipe and the lower series cylindrical pipe are composed of several cylindrical connecting pipes connected in series.

[0015] Preferably, a first nutrient solution inlet and a first nutrient solution outlet are provided on the nutrient solution preparation tank, a third nutrient solution inlet and a third nutrient solution outlet are provided on the buffer disinfection tank, a second nutrient solution inlet is provided on the upper series cylindrical pipe, and a second nutrient solution outlet is provided on the lower series cylindrical pipe; the first nutrient solution outlet and the second nutrient solution inlet are connected by a third pipe, the second nutrient solution outlet and the third nutrient solution inlet are connected by a fourth pipe, and the third nutrient solution outlet and the first nutrient solution inlet are connected by a fifth pipe.

[0016] Preferably, the hydroponics section further includes a supplementary lighting device, which includes a lifting support, a supplementary light source located directly above the hydroponics device, and sliding wheels at the bottom of the lifting support.

[0017] Preferably, both the first frame and the second frame are spliced ​​together from rectangular stainless steel, and both the first frame and the second frame are equipped with casters at the bottom.

[0018] Compared with the prior art, the outstanding features of this utility model, which adopts the above technical solution, are:

[0019] This invention solves the problems of insufficient nutrient solution utilization and pollution in the circulation process of existing soilless cultivation devices. In this device, biogas slurry is used as the preferred fertilizer source and chemical fertilizer is used as a supplementary nutrient element. The nutrient solution can be recycled and disinfected. The nutrient solution can be adjusted according to the concentration and pH changes of the nutrient solution delivered to the circulation system to meet the growth needs of plants.

[0020] This utility model includes two parts: a biogas slurry treatment section and a soilless cultivation section. By utilizing the height difference between the nutrient solution preparation tank and the soilless cultivation section, and in conjunction with a water pump, the nutrient solution is transported to the highest layer. Gravity is then used to achieve liquid recycling. The nutrient solution between each layer is dynamically circulated, and after disinfection, it ensures that there is no infection from bacteria or other contaminants in the nutrient solution.

[0021] This invention places the concentrated nutrient solution mother liquor tank and the biogas slurry collection tank in the upper storage section of the frame, the acid tank, the alkali tank and the water tank in the middle storage section of the frame, and the nutrient solution mixing tank in the lower storage section of the frame. The liquids are automatically added to the nutrient solution mixing tank by gravity, without the need for additional pumps to pump the liquids into the nutrient solution mixing tank. Only a liquid switch is required.

[0022] This utility model features a separate nutrient solution preparation tank for nutrient solution preparation, and also includes a concentrated nutrient solution mother liquor tank, a biogas slurry collection tank, an acid tank, an alkali tank, and a water tank, to avoid contamination between the liquids and to facilitate the addition of liquids after each liquid is used up.

[0023] This invention includes an acid-base sensor and an EC sensor inside the nutrient solution mixing tank, which can detect the pH and concentration of the nutrient solution. The acid-base sensor and the EC sensor are connected to the control equipment, which can monitor the pH and concentration of the nutrient solution in real time. The control equipment can then control the opening of the corresponding solenoid valve to mix the nutrient solution.

[0024] This invention also includes a liquid level sensor and a liquid stirrer inside the nutrient solution mixing tank. The liquid level sensor monitors the liquid level, and the corresponding solenoid valve is opened by the control device to ensure a stable liquid level. The liquid stirrer not only stirs and mixes the nutrient solution, but also controls the flow of the liquid to control the dissolved oxygen concentration in the liquid.

[0025] This invention uses biogas slurry to apply nutrient solution, which can reduce the use of chemical fertilizers and improve the utilization rate of nutrient solution. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the facade structure of this utility model;

[0027] Figure 2 This is a schematic diagram of the structure of the biogas slurry filtration tank of this utility model;

[0028] Figure 3 This is a structural schematic diagram of the acid tank, alkali tank, and water storage tank of this utility model;

[0029] Figure 4 This is a schematic diagram of the nutrient solution mixing tank of this utility model;

[0030] Figure 5 This is a schematic diagram of the structure of the soilless cultivation device and the second frame of this utility model;

[0031] In the diagram: 1. First frame; 2. Control cabinet; 3. Acid tank; 4. Alkali tank; 5. Water storage tank; 6. Pre-sedimentation tank; 7. Biogas slurry filtration tank; 8. First solenoid valve; 9. Concentrated nutrient solution mother liquor tank; 10. Biogas slurry collection tank; 11. Soilless cultivation device; 12. Supplemental lighting device; 13. Buffer disinfection tank; 14. Nutrient solution preparation tank; 15. Filter cloth; 16. Pebble filter layer; 17. Activated carbon filter cotton; 18. Quartz sand filter layer; 19. Screen; 20. PPR support frame; 21. First liquid switch; 22. Second solenoid valve; 23. Second liquid switch; 24. Third solenoid valve; 25. Fourth solenoid valve; 26. Third liquid switch; 27. Main casing; 28. Second frame; 29. ​​Liquid lift pump; 30. Water pump; 31. Upper series cylindrical pipe; 32. Lower series cylindrical pipe. Detailed Implementation

[0032] The following description of the embodiments will help the public better understand the present invention. However, the specific embodiments provided by the applicant should not and should not be regarded as a limitation on the technical solution of the present invention. Any changes to the definition of components or technical features and / or formal but not substantive changes to the overall structure should be regarded as the scope of protection defined by the technical solution of the present invention.

[0033] See Figures 1 to 5 As shown, the technical solution of this utility model is as follows:

[0034] A biogas slurry-replenished soilless cultivation fertilizer supply device includes a biogas slurry treatment section and a soilless cultivation section, which are connected together.

[0035] The biogas slurry treatment unit includes a first frame 1, which is assembled from rectangular stainless steel. Four casters are installed at the bottom corners of both the first frame 1 and the second frame 28, allowing the biogas slurry treatment unit to move. The first frame 1 is divided into three layers from top to bottom: upper, middle, and lower. A pre-sedimentation tank 6 is fixed to the left side of the upper layer. A biogas slurry filtration tank 7 is fixed in the center of the middle layer, and the pre-sedimentation tank 6 and the biogas slurry filtration tank 7 are connected. A concentrated nutrient solution mother liquor tank 9 and a biogas slurry collection tank 10 are fixed to the right side of the upper layer, arranged side-by-side. The biogas slurry filtration tank 7 and the biogas slurry collection tank 10 are connected. A nutrient solution mixing tank 14 is fixed in the center of the lower layer. The nutrient solution mixing tank 14 is made of PP material in one piece, with design dimensions of 900 mm × 500 mm × 260 mm. The concentrated nutrient solution mother liquor tank 9 and the biogas slurry collection tank 10 are connected to the nutrient solution mixing tank 14 via a three-way pipe. On the left side of the middle storage area, acid tank 3, alkali tank 4, and water storage tank 5 are arranged in sequence and fixed, all connected to the nutrient solution mixing tank 14. On the right side of the lower storage area, a buffer disinfection tank 13 is fixed. The buffer disinfection tank 13 is a facility for disinfecting the returned nutrient solution to kill pathogens, parasite eggs, and other harmful microorganisms in the used nutrient solution. The design dimensions of the buffer disinfection tank 13 are: 400 mm × 300 mm × 350 mm. mm, the nutrient solution preparation tank 14 and the buffer disinfection tank 13 are connected. A control cabinet 2 is fixed on the right side of the lower storage section. The control cabinet 2 is equipped with control equipment. A first solenoid valve 8 is installed on the side of the three-way pipe near the nutrient solution preparation tank 14. The first solenoid valve 8 is connected to the control equipment through a connecting line. The control equipment includes a control system, connecting lines and various relays. The control equipment selected is Siemens 7-200 SMARTSR20. The power supply voltage of this module is AC 220V and it adopts the relay output form.

[0036] The hydroponics unit includes a supplemental lighting device 12 and a second frame 28 located to the right of the first frame 1. The first frame 1 and the second frame 28 are adjacent to each other. A hydroponics device 11 is fixed on the second frame 28. A buffer disinfection tank 13 is connected to the hydroponics device 11, and the hydroponics device 11 is connected to the nutrient solution preparation tank 14. The nutrient solution circulates in the nutrient solution preparation tank 14, the buffer disinfection tank 13, and the hydroponics device 11. The second frame 28 is made of rectangular stainless steel, and four casters are installed at the four corners of the bottom of the second frame 28 to move the hydroponics unit. The supplemental lighting device 12 includes a lifting support, on which a supplemental lighting source is fixed. The artificial light source simulates sunlight. The soilless cultivation plants are provided with the light required for photosynthesis. The supplemental light source is located directly above the soilless cultivation device 11. Sliding wheels are installed at the four corners of the bottom of the lifting support. The sliding wheels drive the supplemental light device 12 to move. The distance between the supplemental light source and the soilless cultivation device 11 is adjusted by raising or lowering the lifting support. The height of the soilless cultivation device 11 is higher than the height of the nutrient solution preparation tank 14, thus creating a height difference between the soilless cultivation device 11 and the nutrient solution preparation tank 14. The nutrient solution in the soilless cultivation device 11 flows into the buffer disinfection tank 13 by gravity. A water pump 30 is installed in the nutrient solution preparation tank 14 to pump the nutrient solution to the soilless cultivation device 11. The water pump 30 is connected to the control equipment via connecting lines.

[0037] Acid tank 3 and nutrient solution mixing tank 14 are connected via a first connecting pipe; alkali tank 4 and nutrient solution mixing tank 14 are connected via a second connecting pipe; and water tank 5 and nutrient solution mixing tank 14 are connected via a third connecting pipe. The nutrient solution mixing tank 14 has an acid inlet, an alkali inlet, and a clean water inlet. The acid inlet is connected to the first connecting pipe, the alkali inlet is connected to the second connecting pipe, and the clean water inlet is connected to the third connecting pipe. A second solenoid valve 22 is installed on the first connecting pipe. A third solenoid valve 24 is installed on the pipeline, and a fourth solenoid valve 25 is installed on the third connecting pipeline. The second solenoid valve 22, the third solenoid valve 24, and the fourth solenoid valve 25 are all connected to the control equipment via connecting lines. A first liquid switch 21 is installed between the acid tank 3 and the second solenoid valve 22 on the first connecting pipeline. A second liquid switch 23 is installed between the alkali tank 4 and the third solenoid valve 24 on the second connecting pipeline. A third liquid switch 26 is installed between the water tank 5 and the fourth solenoid valve 25 on the third connecting pipeline.

[0038] Two sludge discharge holes are opened at the bottom of the pre-sedimentation tank 6, and a connection hole is opened on the right side of the pre-sedimentation tank 6. A first pipeline connected to the biogas slurry filter tank 7 is connected to the connection hole, and a fourth liquid switch is installed on the first pipeline. The two sludge discharge holes are used to discharge the solid suspended matter accumulated at the bottom of the pre-sedimentation tank 6, and the pre-sedimentation tank 6 is connected to the biogas slurry filter tank 7 through the connection hole and the first pipeline, which facilitates the flow of biogas slurry to subsequent components.

[0039] The biogas slurry filtration tank 7 has dimensions of 350 mm × 350 mm × 300 mm (length × width × height). It includes a hollow, rectangular main shell 27. Inside the main shell 27, from top to bottom, are: filter cloth 15, pebble filter layer 16, filter cloth 15, activated carbon filter cotton 17, filter cloth 15, quartz sand filter layer 18, filter cloth 15, screen 19, filter cloth 15, and PPR support frame 20. The filter cloth 15 is spaced apart on the upper surface of the main shell 27 and above the pebble filter layer 16, while the PPR support frame 20 is spaced apart on the lower surface of the main shell 27. On the left side of the main shell 27... A first inlet hole is provided above the filter cloth 15 and connected to the first pipeline. A liquid lift pump 29 is fixed below the PPR support frame 20. A first outlet hole is opened on the right side of the main housing 27. The liquid lift pump 29 is connected to the first outlet hole. A second pipeline connected to the biogas slurry collection tank 10 is connected to the first outlet hole. Thus, the filtered biogas slurry is pumped to the biogas slurry collection tank 10 by the liquid lift pump 29. The biogas slurry filtration tank 7, with the help of various filter media and devices, can effectively intercept solids. The filter media 17 and 18 are used to achieve solid-liquid separation of biogas slurry and improve its clarity. The PPR support frame 20 supports all the filter components above. The screen 19 prevents filter media loss. The quartz sand filter layer 18 effectively intercepts unfermented organic matter, silt and other suspended solids in the biogas slurry. It also has a certain adsorption capacity for some heavy metal ions such as lead, mercury and cadmium, which can reduce the concentration of heavy metal ions in the biogas slurry. In addition, it can also intercept and remove some bacteria and pathogens in the biogas slurry. The activated carbon filter cotton 17 has three layers of filter materials: activated carbon, polyester and bamboo charcoal, which can achieve multiple high-efficiency filtration. The pebble filter layer 16 can first intercept larger particulate impurities in the biogas slurry, such as branches and large solid wastes, and play a preliminary filtration role. It prevents these large particles from entering the subsequent finer filter layers and causing blockage or damage to the quartz sand and other filter media, thus extending the service life of the biogas slurry filter tank 7. The filter cloth 15 can prevent filter media loss and enhance the filtration effect of the biogas slurry filter tank 7.

[0040] A second inlet hole connected to a second pipeline is provided on the biogas slurry collection tank 10. A second outlet hole is provided on both the biogas slurry collection tank 10 and the concentrated nutrient solution mother liquor tank 9. Both second outlet holes are connected to a three-way pipeline. A concentrated nutrient solution and biogas slurry mixture inlet connected to a three-way pipeline is provided on the nutrient solution mixing tank 14. A first solenoid valve 8 is provided on the side of the three-way pipeline near the concentrated nutrient solution and biogas slurry mixture inlet. The concentrated nutrient solution mother liquor tank 9 is made of PP material in one piece, which has good sealing performance, corrosion resistance and aging resistance. The size of the concentrated nutrient solution mother liquor tank 9 is 340 mm × 340 mm × 310 mm.

[0041] A pH sensor, a level sensor, an EC sensor, an ultraviolet germicidal lamp, and a liquid stirrer are placed in the nutrient solution preparation tank 14. All of these components are connected to the control equipment. The pH sensor monitors the pH of the nutrient solution in the preparation tank 14 in real time; the level sensor monitors the liquid level; the EC sensor monitors the concentration; the ultraviolet germicidal lamp sterilizes and disinfects the solution; and the liquid stirrer thoroughly mixes all liquids in the tank. The pH sensor uses a KML-P0-01A type pH composite electrode, the EC sensor uses an S-EC-A2LT type intelligent conductivity electrode, and the level sensor is a MAQI-136 submersible level sensor.

[0042] The soilless cultivation device 11 includes an upper series cylindrical pipe 31 and a lower series cylindrical pipe 32 fixed on the second frame 28. The upper series cylindrical pipe 31 and the lower series cylindrical pipe 32 are spaced apart and interconnected. Both the upper series cylindrical pipe 31 and the lower series cylindrical pipe 32 are composed of four cylindrical connecting pipes connected in series.

[0043] A first nutrient solution inlet and a first nutrient solution outlet are provided on the nutrient solution preparation tank 14, a third nutrient solution inlet and a third nutrient solution outlet are provided on the buffer disinfection tank 13, a second nutrient solution inlet is provided on the upper series cylindrical pipe 31, and a second nutrient solution outlet is provided on the lower series cylindrical pipe 32; the first nutrient solution outlet and the second nutrient solution inlet are connected by a third pipe, the second nutrient solution outlet and the third nutrient solution inlet are connected by a fourth pipe, and the third nutrient solution outlet and the first nutrient solution inlet are connected by a fifth pipe.

[0044] The working principle is as follows:

[0045] During operation, the collected biogas slurry first enters the pre-sedimentation tank 6 for preliminary filtration and sedimentation, separating solid suspended matter with a specific gravity greater than the biogas slurry. After the pre-sedimentation reaches the predetermined number of days, the fourth liquid switch on the first pipeline is opened, and the biogas slurry enters the biogas slurry filtration tank 7. The solid impurities that settle at the bottom of the pre-sedimentation tank 6 will be discharged through the two drain holes at the bottom. The biogas slurry filtration tank 7 is equipped with multi-layer filtration components, which can perform multi-stage filtration of the biogas slurry, adsorbing and filtering the residual solid suspended matter and some trace heavy metals in the biogas slurry to obtain relatively pure biogas slurry liquid. The biogas slurry filtration tank 7 is equipped with a liquid lift pump 29, which lifts the filtered biogas slurry to the biogas slurry collection tank 10 for later use. Next to the biogas slurry collection tank 10, there is a concentrated nutrient solution mother liquor tank 9, which contains concentrated nutrient solution required for plant growth. The concentrated nutrient solution and biogas slurry are mixed in a 1:5 ratio in the bottom nutrient solution mixing tank 14.

[0046] An EC sensor and an acid / alkali sensor are installed in the nutrient solution preparation tank 14 to monitor the environment in real time. The control equipment will then automatically add acid, alkali, and water according to the acid / alkali environment in the nutrient solution preparation tank 14 to adjust the environment to achieve the optimal environment for plant growth. At the same time, a liquid stirrer is also installed in the nutrient solution preparation tank 14 to thoroughly mix the various liquids. An ultraviolet germicidal lamp is also installed in the nutrient solution preparation tank 14 to sterilize and disinfect the nutrient solution. Once the liquid in the nutrient solution preparation tank 14 is ready, the water pump 30 in the nutrient solution preparation tank 14 lifts the prepared nutrient solution into the hydroponics device 11. The nutrient solution flows from the upper series cylindrical pipe 31 to the lower series cylindrical pipe 32, and then from the lower series cylindrical pipe 32 to the buffer disinfection tank 13. The buffer disinfection tank 13 sterilizes and disinfects the used nutrient solution again, and then it flows back from the buffer disinfection tank 13 to the nutrient solution preparation tank 14, thus achieving the recycling of the nutrient solution.

[0047] This invention solves the problems of insufficient nutrient solution utilization and pollution in the existing soilless cultivation device 11 during the circulation process. In this device, biogas slurry is used as the preferred fertilizer source and chemical fertilizer is used as a supplementary nutrient element. The nutrient solution can be recycled and disinfected. The nutrient solution can be adjusted according to the concentration and pH changes of the nutrient solution delivered to the circulation system to meet the growth needs of plants.

[0048] This utility model includes two parts: a biogas slurry treatment section and a soilless cultivation section. By utilizing the height difference between the nutrient solution mixing tank 14 and the soilless cultivation section, and in conjunction with a water pump, the nutrient solution is transported to the highest layer. Gravity is then used to achieve liquid recycling. The nutrient solution between each layer is dynamically circulated, and after disinfection, it ensures that there is no infection from bacteria or other contaminants in the nutrient solution.

[0049] This utility model places the concentrated nutrient solution mother liquor tank 9 and the biogas slurry collection tank 10 in the upper storage section of the frame, the acid tank 3, the alkali tank 4 and the water tank in the middle storage section of the frame, and the nutrient solution mixing tank 14 in the lower storage section of the frame. The liquids are automatically added to the nutrient solution mixing tank 14 by gravity. There is no need to set up an additional pump to pump each liquid into the nutrient solution mixing tank 14. Only a liquid switch is required.

[0050] This utility model is equipped with a separate nutrient solution preparation tank 14 for nutrient solution preparation, and also has a concentrated nutrient solution mother liquor tank 9, a biogas slurry collection tank 10, an acid liquid tank 3, an alkali liquid tank 4, and a water tank, to avoid contamination between the liquids and to facilitate the addition of each liquid after use.

[0051] This invention includes an acid-base sensor and an EC sensor inside the nutrient solution mixing tank 14, which can detect the pH and concentration of the nutrient solution. The acid-base sensor and the EC sensor are connected to the control device, which can monitor the pH and concentration of the nutrient solution in real time. Then, the control device controls the opening of the corresponding solenoid valve to mix the nutrient solution.

[0052] This invention also includes a liquid level sensor and a liquid stirrer inside the nutrient solution mixing tank 14. The liquid level sensor monitors the liquid level and the corresponding solenoid valve is opened by the control device to ensure a stable liquid level. The liquid stirrer not only stirs and mixes the nutrient solution, but also controls the flow of the liquid to control the dissolved oxygen concentration in the liquid.

[0053] This invention uses biogas slurry to apply nutrient solution, which can reduce the use of chemical fertilizers and improve the utilization rate of nutrient solution.

[0054] The above description is only a preferred embodiment of the present utility model and does not limit the scope of the present utility model. All equivalent changes made based on the content of the present utility model specification and its drawings are included within the scope of the present utility model.

Claims

1. A biogas slurry-replenished soilless cultivation fertilizer supply device, characterized in that: The system includes a biogas slurry treatment section and a soilless cultivation section, which are connected. The biogas slurry treatment section includes a first frame, which is divided into upper, middle, and lower storage sections from top to bottom. A pre-sedimentation tank is fixed on the left side of the upper storage section, and a biogas slurry filtration tank is fixed in the center of the middle storage section. The pre-sedimentation tank and the biogas slurry filtration tank are connected. A concentrated nutrient solution mother liquor tank and a biogas slurry collection tank are fixed on the right side of the upper storage section. The biogas slurry filtration tank and the biogas slurry collection tank are connected. A nutrient solution mixing tank is fixed in the center of the lower storage section. The concentrated nutrient solution mother liquor tank and the biogas slurry collection tank are connected to the nutrient solution mixing tank through a three-way pipe. An acid tank, an alkali tank, and a water storage tank are arranged and fixed in sequence on the left side of the middle storage section. The acid tank, alkali tank, and water storage tank are all used for nutrient solution mixing. The pools are connected. A buffer disinfection pool is fixed on the right side of the lower storage section. The nutrient solution preparation pool is connected to the buffer disinfection pool. A control cabinet is fixed on the right side of the lower storage section. The control cabinet is equipped with control equipment. A first solenoid valve is installed on the side of the three-way pipe near the nutrient solution preparation pool. The first solenoid valve is connected to the control equipment through a connecting line. The hydroponics section includes a second frame located on the right side of the first frame. A hydroponics device is installed on the second frame. The buffer disinfection pool is connected to the hydroponics device. The hydroponics device is connected to the nutrient solution preparation pool. The height of the hydroponics device is higher than the height of the nutrient solution preparation pool. A water pump is installed in the nutrient solution preparation pool to pump the nutrient solution to the hydroponics device. The water pump is connected to the control equipment through a connecting line.

2. The biogas slurry-replenished soilless cultivation fertilizer supply device according to claim 1, characterized in that: The acid tank and the nutrient solution mixing tank are connected by a first connecting pipe, the alkali tank and the nutrient solution mixing tank are connected by a second connecting pipe, and the water storage tank and the nutrient solution mixing tank are connected by a third connecting pipe. A second solenoid valve is installed on the first connecting pipe, a third solenoid valve is installed on the second connecting pipe, and a fourth solenoid valve is installed on the third connecting pipe. The second, third, and fourth solenoid valves are all connected to control equipment via connecting lines. A first liquid switch is installed between the acid tank and the second solenoid valve on the first connecting pipe, a second liquid switch is installed between the alkali tank and the third solenoid valve on the second connecting pipe, and a third liquid switch is installed between the water storage tank and the fourth solenoid valve on the third connecting pipe.

3. The biogas slurry-replenished soilless cultivation fertilizer supply device according to claim 1, characterized in that: Two sludge discharge holes are provided at the bottom of the pre-sedimentation tank. A connection hole is provided on the right side of the pre-sedimentation tank. A first pipeline connected to the biogas slurry filter tank is connected to the connection hole. A fourth liquid switch is provided on the first pipeline.

4. The biogas slurry-replenished soilless cultivation fertilizer supply device according to claim 1, characterized in that: The biogas slurry filtration tank includes a hollow, rectangular main shell. Inside the main shell, from top to bottom, there are filter cloth, a pebble filter layer, another filter cloth, activated carbon filter cotton, another filter cloth, a quartz sand filter layer, another filter cloth, a screen, another filter cloth, and a PPR support frame. The filter cloth on the upper surface of the main shell and above the pebble filter layer is spaced apart, and the PPR support frame and the lower surface of the main shell are spaced apart. On the left side of the main shell, there is a first inlet hole above the filter cloth and connected to a first pipeline. A liquid booster pump is located below the PPR support frame. On the right side of the main shell, there is a first outlet hole connected to the liquid booster pump. A second pipeline connected to the biogas slurry collection tank is connected to the first outlet hole.

5. The biogas slurry-replenished soilless cultivation fertilizer supply device according to claim 1, characterized in that: A second inlet hole connected to a second pipeline is provided on the biogas slurry collection tank. A second outlet hole is provided on both the biogas slurry collection tank and the concentrated nutrient solution mother liquor tank. Both second outlet holes are connected to a three-way pipeline. A concentrated nutrient solution and biogas slurry mixture inlet connected to a three-way pipeline is provided on the nutrient solution mixing tank. A first solenoid valve is provided on the side of the three-way pipeline near the concentrated nutrient solution and biogas slurry mixture inlet.

6. The biogas slurry-replenished soilless cultivation fertilizer supply device according to claim 1, characterized in that: An acid-base sensor, a liquid level sensor, an EC sensor, an ultraviolet germicidal lamp, and a liquid stirrer are placed in the nutrient solution preparation tank. All of these sensors are connected to the control equipment.

7. The biogas slurry-replenished soilless cultivation fertilizer supply device according to claim 1, characterized in that: The hydroponic device includes an upper series cylindrical pipe and a lower series cylindrical pipe fixed on a second frame. The upper series cylindrical pipe and the lower series cylindrical pipe are spaced apart and interconnected. Both the upper series cylindrical pipe and the lower series cylindrical pipe are composed of several cylindrical connecting pipes connected in series.

8. The biogas slurry-replenished soilless cultivation fertilizer supply device according to claim 7, characterized in that: A first nutrient solution inlet and a first nutrient solution outlet are provided in the nutrient solution preparation tank. A third nutrient solution inlet and a third nutrient solution outlet are provided in the buffer disinfection tank. A second nutrient solution inlet is provided on the upper series cylindrical pipe, and a second nutrient solution outlet is provided on the lower series cylindrical pipe. The first nutrient solution outlet and the second nutrient solution inlet are connected by a third pipe. The second nutrient solution outlet and the third nutrient solution inlet are connected by a fourth pipe. The third nutrient solution outlet and the first nutrient solution inlet are connected by a fifth pipe.

9. The biogas slurry-replenished soilless cultivation fertilizer supply device according to claim 1, characterized in that: The hydroponic cultivation unit also includes a supplementary lighting device, which includes a lifting support, a supplementary light source located directly above the hydroponic cultivation unit, and sliding wheels at the bottom of the lifting support.

10. The biogas slurry-replenished soilless cultivation fertilizer supply device according to claim 1, characterized in that: Both the first and second frames are made of rectangular stainless steel and are equipped with casters at the bottom.

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