A fertilizer and water storage device and method

Abstract

This invention belongs to the field of fertilizer and water treatment technology, specifically relating to a fertilizer and water storage device and method. It includes: a fertilizer and water storage tank; an oil feeding device for adding silicone oil-based substances to the fertilizer and water storage tank; and an acidifier feeding pipe positioned above the fertilizer and water storage tank. The acidifier feeding pipe is equipped with several acidifier nozzles for adding acidifiers to the fertilizer and water storage tank. This device adds silicone oil-based substances to the fertilizer and water storage tank, forming a film-like covering, which significantly reduces the odor released during fertilizer and water storage, avoiding the drawbacks of using geotextiles and plastic covers that easily form biogas sacs. Simultaneously, the silicone oil covering creates a relatively anaerobic environment, causing the organic waste in the fertilizer and water to produce more organic acids, significantly improving the acidification effect after adding the acidifier. No additional land is required for fertilizer and water acidification facilities, and the acidifier can be added to the fertilizer and water at any time during storage.

Description

Technical Field

[0001] This invention belongs to the field of fertilizer and water treatment technology, specifically relating to a fertilizer and water storage device and method. Background Technology

[0002] The literal meaning of "fertilizer water" is water containing fertilizer, usually referring to the fertilizer water and biogas slurry produced after the treatment of liquid manure from livestock and poultry farming. Currently, the commonly used treatment technologies for liquid manure are anaerobic fermentation and static storage. Because the biogas slurry formed after anaerobic fermentation and the statically stored fertilizer water contain high concentrations of ammonium, they need to be stored for a certain period of time before they can be applied to farmland. During the storage process, the biogas slurry releases a large amount of ammonia gas into the environment, which not only pollutes the ambient air but also reduces the fertilizer efficiency of the biogas slurry.

[0003] Currently, the main technology for acidifying fertilized water in aquaculture farms involves acidifying the fertilized water in acidification tanks or pipelines before it enters the storage tank. This ensures that the ammonium in the fertilized water exists as ammonium ions for a long time, reducing the volatilization of ammonia and achieving the goal of increasing the efficiency of fertilization and reducing air pollution. However, it is difficult for existing and operating aquaculture farms to allocate land for the construction of acidification tanks, which limits the promotion and application of fertilization technology.

[0004] Chinese patent application number 202222184090.7 proposes a multi-stage fertilization system and process for continuous acidification of aquaculture fertilization water. The system utilizes a concealed pipe connecting the fertilization water outlet in the aquaculture shed or biogas project to the fertilization water storage tank, eliminating the need for additional land for facility construction. Furthermore, the multi-stage aquaculture fertilization system uses the flow of fertilization water from the outlet to the storage tank as a power source for mixing the fertilization water and acidifying agent. The spiral fins in the system act as a stirring device during the acidification process, effectively reducing energy consumption. However, it cannot precisely control ammonia emissions during fertilization water storage.

[0005] Chinese patent application number 201811605895.6 proposes a batch-type fertilizer-water acidification, storage and treatment device and method. The device collects fertilizer water in an acidification tank for acidification. During the process, a stirring device needs to be started to mix the fertilizer water. This realizes the automated control of the acidification process. However, the fertilizer-water acidification process requires the construction of an acidification tank, which occupies additional facilities and land. The stirring device consumes a lot of electricity, which increases the operating cost of the fertilizer-water acidification process.

[0006] Chinese patent application number 201821589522.X proposes a sequential batch fertilizer acidification treatment and storage device. This device can realize the automated control of the fertilizer acidification process, but the device requires a stirring process during operation, which increases the operating cost of the acidification process.

[0007] Chinese patents with application numbers 201811598148.4, 201911141967.0, 201911141976.X, 201911141966.6, and 201911142232.X propose methods for acidifying fertilizer water with alum, superphosphate, and sulfuric acid. All of these processes use a batch acidification method, and the acidification process requires additional stirring of the manure, which increases the operating cost of the acidification process.

[0008] Chinese patents with application numbers 201510620737.8, 201811640295.3, 202011638318.4, 202020956675.4, and 201520751549.4 employ methods or apparatus for preparing water-soluble fertilizers, proposing various processes and apparatuses for preparing water-soluble fertilizers.

[0009] The aforementioned technology utilizes an acidifying agent to acidify the entire fertilized water to a specified pH value to reduce ammonia emissions during storage. However, the pH of the acidified fertilized water rises rapidly during storage, causing ammonia concentrations to return to high levels even after a week of storage, resulting in unsatisfactory ammonia control. Although CN201811598148.4 stipulates that if the pH of the fertilized water exceeds 6.5 in the first 5 days of storage, secondary acidification should be performed in an equalization tank (also known as an acidification tank). However, most farms only have one storage tank. While the fertilized water can undergo secondary or multiple acidifications in the storage tank, the mixing process generates a large number of bubbles, posing a risk of overflow and hindering operational efficiency. Furthermore, in practice, fertilized water storage typically lasts for up to six months, and controlling only the pH range of the fertilized water in the first 5 days is insufficient to control ammonia emissions throughout the entire storage period.

[0010] Meanwhile, although some fertilizer and water storage facilities currently reduce odor and greenhouse gas emissions by covering the surface with straw or rice straw, straw and rice straw are easily damaged by wind and rain, and geotextile and plastic sheet coverings can easily form local biogas sacs, posing safety risks. Summary of the Invention

[0011] To address the shortcomings of existing technologies, this invention provides a fertilizer and water storage device and method.

[0012] Specifically, the present invention provides the following technical solution:

[0013] A fertilizer and water storage device, comprising:

[0014] Fertilizer storage tank;

[0015] An oil feeding device is used to add silicone oil-based substances to the fertilizer storage tank.

[0016] As used in this invention, the term "silicone oil-based substance" refers to substances including silicone oil, silicone oil derivatives, and combinations thereof. More specific examples of silicone oil include dimethyl polysiloxane. Examples of silicone oil derivatives include methyl silicone oil, ethyl silicone oil, phenyl silicone oil, methyl hydrogen silicone oil, methyl phenyl silicone oil, methyl chlorophenyl silicone oil, methyl ethoxy silicone oil, methyl trifluoropropyl silicone oil, methyl vinyl silicone oil, methyl hydroxy silicone oil, ethyl hydrogen silicone oil, hydroxy hydrogen silicone oil, cyanide silicone oil, etc.

[0017] In this invention, silicone oil is added to the fertilizer storage tank through an oil feeding device. The silicone oil has a lower density than water and can float on the fertilizer, forming a film-like covering. It has the advantages of being stable, non-volatile, acid and alkali resistant, and weatherproof. At the same time, although the odor and greenhouse gases released during the storage of fertilizer are not hindered by the oil film, they can be discharged freely, but the emission amount will be significantly reduced. This avoids the disadvantage of using geotextile and plastic sheet coverings, which can easily form local biogas sacs.

[0018] The present invention does not impose any special restrictions on the type, quantity, or feeding method of the oil feeding device, and conventional methods can be used for selection, as long as silicone oil-like substances can be added to the fertilizer storage tank.

[0019] Preferably, the above-mentioned fertilizer and water storage device further includes:

[0020] An acidifier feeding pipe is provided above the fertilizer and water storage tank; the acidifier feeding pipe is equipped with several acidifier nozzles for adding acidifier to the fertilizer and water storage tank.

[0021] In this invention, the fertilizer water acidification device is constructed above the fertilizer water storage tank, eliminating the need for additional land for fertilizer water acidification facilities. Furthermore, acidifying only the surface layer of fertilizer water effectively reduces the amount of acidifying agent required by approximately 30%, lowering enterprise costs. More importantly, it allows for the periodic addition of acidifying agent throughout the fertilizer water storage period, controlling odor emissions throughout the entire process. Further, this invention discovers that covering the fertilizer water with silicone oil-based substances creates a relatively anaerobic environment, and coupled with acidification treatment, this causes the organic waste in the fertilizer water to generate more organic acids, thereby increasing the nutrient content of the stored fertilizer water.

[0022] Preferably, the acidifier feeding pipe is also equipped with an ammonia sensor to monitor the ammonia concentration above the fertilizer solution and the area and location where the ammonia concentration exceeds the standard.

[0023] Preferably, the fertilizer storage tank is equipped with sliding tracks on both sides, and sliding frames are installed on the sliding tracks. The acidifier feeding pipe is connected to two sliding frames at each end, allowing it to slide along the sliding tracks. By controlling the sliding of the acidifier feeding pipe along the sliding tracks and using an ammonia sensor installed on the acidifier feeding pipe to monitor the ammonia concentration above the fertilizer and the area and location where the ammonia concentration exceeds the standard, the acidifier is sprayed onto the area where the ammonia concentration exceeds the standard.

[0024] Further preferably, a position sensor is provided on the sliding track. The position sensor and the ammonia sensor are connected to the control system, which controls the sliding frame and the acidifier nozzle. In this invention, the control system records the positions of different ammonia sensors as the x-axis, and the position sensor can feed back the position of the acidifier feeding pipe to the control system as the y-axis. The control system can control the sliding frame to move the acidifier feeding pipe along the sliding track at regular intervals each day. When the odor concentration above the fertilizer storage tank exceeds a set value, the acidifier nozzle sprays a fixed amount of acidifier onto the surface of the fertilizer water where the ammonia concentration exceeds the standard, based on indicators such as the area of ​​the ammonia concentration exceeding the standard detected by the ammonia sensor, the ammonia concentration, and the amount of fertilizer water. At the same time, the control system can count the amount of acidifier added during the storage of fertilizer water and control the total amount of acidifier added to the storage tank to not exceed 5% of the total amount of fertilizer water (the control system can set the acidifier addition threshold range of 0.1% to 5%).

[0025] Preferably, the above-mentioned fertilizer and water storage device further includes:

[0026] A three-dimensional mesh is horizontally positioned on the liquid surface of the fertilizer storage tank. The three-dimensional mesh consists of several mesh frames, each frame being hollow and enclosed by vertical borders. A mesh screen is installed on the side of each mesh frame facing the fertilizer storage tank. In this invention, the three-dimensional mesh divides the oil film on the liquid surface of the fertilizer storage tank into independent spaces, further reducing the impact of wind, rain, and other climatic factors on silicone oil substances, and allowing it to quickly recover its original state after being affected by external factors. In actual use, the mesh screen is located below the surface of the oil film formed by the silicone oil substances. The mesh screen is used to suppress particulate matter in the fertilizer water, preventing floating or suspended particles from damaging the film-like covering formed by the silicone oil substances.

[0027] More preferably, the mesh size is no greater than 0.15 mm.

[0028] Further preferably, the vertical frame is provided with several flow holes. When the flow holes are at the same level as the liquid level in the fertilizer storage tank, the flow holes can be used for mutual replenishment of silicone oil substances between different grid frames. If silicone oil substances are lacking in a local grid frame, they can be replenished from other grid frames through the flow holes. Simultaneously, silicone oil substances can be replenished from the edge of the fertilizer storage tank to the entire storage tank without moving the three-dimensional grid. Silicone oil substances can also be added through a silicone oil substance feeding pipe located above the fertilizer storage tank.

[0029] In a preferred embodiment, the material density of the mesh frame is lower than that of water, and it also has the characteristics of corrosion resistance and aging resistance.

[0030] In a preferred embodiment, an oil film collection and distribution device is also included. The oil film collection and distribution device is set on the surface of the fertilizer water and is powered by a sliding track. It can move on the surface of the fertilizer water and is mainly used to collect and distribute oil film. After a portion of the "three-dimensional grid" is removed from the fertilizer water, the oil film on the surface of the fertilizer water can be concentrated in a certain area by the scraping of the "oil film collection and distribution device". This is used to increase the killing effect of sunlight ultraviolet radiation on harmful microorganisms in the fertilizer water before returning it to the field, and it is also used to recover the oil film.

[0031] Preferably, a pH meter is also included, which is installed in the fertilizer storage tank to monitor the pH value of the fertilizer water in the tank.

[0032] Preferably, the pH meter is connected to the control system. When the pH value of the fertilizer solution is below 6.0 (the settable range is 5.5–7.5), the control system does not add acidifying agent to the storage tank. The pH value of the fertilizer solution is an important reference data for returning it to the field. In particular, fertilizer solution with a pH below 5.5 is not suitable for returning to the field. Therefore, pH needs to be monitored to avoid large deviations in the ammonia sensor due to ammonia gas escape from other areas, resulting in excessive local addition of acidifying agent.

[0033] The present invention also provides a method for storing fertilizer and water in the above-mentioned fertilizer and water storage device, comprising the following steps:

[0034] Add fertilizer to the fertilizer storage tank;

[0035] Silicone oil is added to the fertilizer storage tank through an oil feeding device, and the silicone oil forms an oil film on the surface of the fertilizer.

[0036] Preferably, the acidifier feeding pipe is controlled to pass over the entire fertilizer storage tank, and the ammonia concentration above the fertilizer is monitored by the ammonia sensor on the acidifier feeding pipe. The acidifier is sprayed into the area where the ammonia concentration exceeds the standard through the acidifier nozzle. Preferably, the spraying of the acidifier is stopped when the pH value of the fertilizer is lower than 6.0.

[0037] Preferably, the thickness of the oil film is 1 mm or more, more preferably 4-6 mm. If the thickness of the oil film is too small, it is difficult to recover quickly after being affected by wind and rain. At the same time, experiments have shown that using an oil film of 4.0-6.0 mm can significantly increase the emission reduction effect of the oil film on ammonia or odor (a thick oil film creates an excessive anaerobic environment, which actually promotes the generation of odor), and increase the nutrient content in the fertilized water.

[0038] In a preferred embodiment, the amount of acidifier added is positively correlated with the depth of fertilization. When the acidifier is concentrated sulfuric acid, the amount of acidifier added per unit area per single application is preferably 0.1‰hS to 1.0‰hS, where h is the depth of fertilization in the storage tank (m) and S is the area with excessive ammonia concentration (m²). 2 Meanwhile, in order to accurately control the amount of acid added, concentrated acid should not be used as the acidifier. It is better to use it after dilution with water. When using diluted sulfuric acid, the amount of acidifier added needs to be multiplied by the sulfuric acid dilution factor.

[0039] Preferably, when the pH value of the fertilizer solution is below 5.5, some of the oil film covering the surface of the fertilizer solution is collected, and some of the fertilizer solution is stored in the open air until the pH value of the fertilizer solution rises to 6.0 (the range can be set from 5.5 to 7.5) or higher.

[0040] By employing the above technical solution, the present invention has at least the following advantages and beneficial effects:

[0041] 1) The fertilizer and water storage device and method provided by the present invention add silicone oil-based substances to the fertilizer and water storage tank through an oil feeding device. The silicone oil-based substances have a lower density than water and can float on the fertilizer and water to form a film-like covering. It has the advantages of being stable, non-volatile, acid and alkali resistant, and weatherproof. At the same time, although the odor and greenhouse gases released during the storage of fertilizer and water are not hindered by the oil film, they can be discharged freely, but the emission amount will be significantly reduced, avoiding the disadvantage of forming local biogas sacs when using geotextile and plastic sheet covering. Furthermore, the silicone oil-based substances covering the fertilizer and water can create a relatively anaerobic environment, and coupled with acidification treatment, the organic waste in the fertilizer and water will produce more organic acids, significantly improving the acidification effect.

[0042] 2) The fertilizer and water storage device and method provided by the present invention do not require additional land for fertilizer and water acidification facilities. At the same time, acidifying only the surface fertilizer and water can effectively reduce the amount of fertilizer and water acidifying agent added, thereby reducing enterprise costs. More importantly, it can regularly monitor the pH, ammonia emissions and other factors of fertilizer and water during the entire fertilizer and water storage period, and add an appropriate amount of acidifying agent to the appropriate area of ​​fertilizer and water, thereby controlling the odor emissions during the fertilizer and water storage period. Attached Figure Description

[0043] Figure 1 This is a plan view of the fertilizer and water storage device coupled with acidification treatment and oil film coating in Example 1;

[0044] Figure 2 This is a schematic diagram of the three-dimensional mesh in Example 1;

[0045] Figure 3 This is a schematic diagram of the mesh frame in Example 1;

[0046] Figure 4 This is a cross-sectional view of the fertilizer and water storage device coupled with acidification treatment and oil film coating in Example 1;

[0047] Figure 5 This is a schematic diagram of the acidifier and silicone oil feeding pipe in Example 1;

[0048] In the above diagram, 1. Feeding pipe; 2. Sliding track; 3. Fertilizer water outlet; 4. Three-dimensional grid; 5. First fertilizer water storage tank; 6. Acid storage device; 7. Control system; 8. Fertilizer water inlet; 9. Second fertilizer water storage tank; 10. pH meter; 11. Silicone oil storage tank; 12. Oil-water separator; 13. Oil film distribution device; 14. Oil film; 15. Fertilizer water layer; 1-1. Acidifier feeding pipe; 1-2. Silicone oil feeding pipe; 4-1. Grid frame; 4-2. Vertical frame in the length direction; 4-3. Vertical frame in the width direction; 4-4. Flow hole; 4-5. Mesh; 1-1-1. Ammonia sensor; 1-1-2. Electrical control switch; 1-1-3. Acidifier nozzle; 1-2-1. Silicone oil addition hole. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] Example 1

[0051] 1. A fertilizer and water storage device that couples acidification treatment and oil film coating, see [reference] Figure 1-5 As shown, it includes: a first fertilizer and water storage tank 5, a second fertilizer and water storage tank 9, a feeding pipe 1, a three-dimensional grid 4, an oil film distribution device 13, a pH meter 10, and a control system 7.

[0052] in:

[0053] The first fertilizer storage tank 5 and the second fertilizer storage tank 9 are respectively provided with fertilizer inlet 8 and fertilizer outlet 3.

[0054] The feeding pipe 1 is installed above each fertilizer storage tank, including parallel acidifier feeding pipe 1-1 and silicone oil-based substance feeding pipe 1-2.

[0055] The acidifier feeding pipe 1-1 is equipped with several acidifier nozzles 1-1-3 controlled by an electronic switch 1-1-2, which are used to add acidifier from the acid storage device 6 to the fertilizer storage tank; the acidifier feeding pipe 1-1 is also equipped with an ammonia sensor 1-1-1, which is used to monitor the ammonia concentration above the fertilizer and the area and location where the ammonia concentration exceeds the standard.

[0056] The silicone oil feeding pipe 1-2 is provided with a number of silicone oil adding holes 1-2-1 for adding silicone oil to the fertilizer storage tank to form an oil film 14 on the surface of the fertilizer layer 15.

[0057] Each fertilizer storage tank is equipped with sliding tracks 2 on both the left and right sides, and sliding frames are installed on the sliding tracks 2. The two ends of the feeding pipe 1 are respectively connected to two sliding frames and slide on the sliding tracks 2.

[0058] The three-dimensional grid 4 is horizontally set on the liquid surface of each fertilizer storage tank. It is composed of several grid frames 4-1. Each grid frame 4-1 is hollow and is surrounded by vertical borders 4-2 in the length direction and vertical borders 4-3 in the width direction. A mesh 4-5 is set on the side of any grid frame 4-1 facing the fertilizer storage tank. The mesh 4-5 is located below the liquid surface of the oil film 14 formed by silicone oil.

[0059] Several flow holes 4-4 are provided on both the vertical frame 4-2 in the length direction and the vertical frame 4-3 in the width direction.

[0060] The oil film collection and distribution device 13 is set on the surface of the fertilizer water and is mainly used to collect and distribute the oil film. After a portion of the "three-dimensional grid" is removed from the fertilizer water, the oil film on the surface of the fertilizer water can be concentrated in a certain area by the scraping of the "oil film collection and distribution device". This is used to increase the killing effect of sunlight ultraviolet radiation on harmful microorganisms in the fertilizer water before returning it to the field, and it is also used to recover the oil film.

[0061] The sliding track 2 is equipped with a position sensor, and the position sensor and the ammonia sensor 1-1-1 are connected to the control system 7. The control system 7 controls the movement of the sliding frame and the opening and closing of the electronic switch 1-1-2 of the acidifier nozzle 1-1-3.

[0062] The pH meter 10 is installed in each fertilizer storage tank to monitor the pH value of the fertilizer solution in the tank. The pH meter is connected to the control system 7.

[0063] 2. The method for storing fertilizer and water in the above-mentioned coupled acidification treatment and oil film covering fertilizer and water storage device includes the following steps:

[0064] 1) Preparation stage

[0065] (1) Add an appropriate amount of fertilizer to the fertilizer storage tank, and place the mesh frame 4-1 with the mesh 4-5 facing down in the fertilizer to form a mesh protection system. Add silicone oil or its modified product to the fertilizer storage tank through multiple silicone oil-based material addition holes 1-2-1 on the silicone oil-based material feeding pipe 1-2. The addition amount V1 is calculated based on the area S1 of the fertilizer storage tank, forming an oil film 14 with a thickness of 5mm. Therefore, V1 = 0.005m × S1. During the addition of silicone oil or its modified product, the feeding pipe 1 slides evenly from one side to the other side on the sliding track 2.

[0066] (2) The system calibrates the position of each ammonia sensor 1-1-1 (as the x-axis), and calibrates the position of the feeding pipe 1 on the sliding track 2 (as the y-axis);

[0067] (3) Correct the control system data: ① Set the daily acidification system operation time (17:00 in the afternoon); ② Ammonia concentration feedback acid addition threshold (70ppm, acid addition starts when the ammonia concentration exceeds this value); ③ Acidification agent addition amount per unit area (0.1‰hS, this invention takes concentrated sulfuric acid as an example. If the concentrated sulfuric acid is diluted by 2 times with water, the acidification agent addition amount is 2×0.1‰hS); ④ pH feedback control value (acidification agent cannot be added to the fertilizer storage tank when the pH value of the fertilizer water is lower than this value).

[0068] 2) Acidification process

[0069] The fertilizer solution flows normally into the storage tank daily. At 17:00 (time can be set manually), the control system 7 starts the motor on the sliding guide rail 2 to make the feeding pipe 1 slide at a constant speed from one side to the opposite boundary. The ammonia concentration on the surface of the fertilizer solution is monitored by the ammonia sensor 1-1-1. If the ammonia concentration exceeds the set value, the position of the feeding pipe 1 on the sliding guide rail 2 at this time is recorded (denoted as Y), and the position of the sensor that detected the ammonia concentration exceeding the set value is also recorded (denoted as X). After the feeding pipe 1 slides to the opposite side, the control system 7 analyzes the location and range of the ammonia concentration exceeding the set value. The control system 7 controls the feeding pipe 1 to slide at a constant speed in the opposite direction. When it passes through the area where the ammonia concentration exceeds the standard, the acidifying agent nozzles 1-1-3 in the corresponding range are activated. When the feeding pipe 1 exceeds the area where the ammonia concentration exceeds the standard, the acid addition stops, and the feeding pipe 1 continues to slide to the boundary to stop the acid addition process. The cumulative amount of acid added to the fertilizer solution should not exceed 5% of the total amount of fertilizer solution. At the same time, when the pH value of the fertilizer solution is below 6.0 (the range can be set from 5.5 to 7.5), acidifiers should not be added to the fertilizer solution.

[0070] 3) Oil film regulates pH

[0071] During the storage of fertilizer and water, the oil film can induce anaerobic fermentation, leading to a decrease in the pH value of the fertilizer and water, and synergistically promoting the acidification process. When the pH value of the fertilizer and water is lower than 5.5, it is necessary to adjust the coverage area of ​​the oil film to prevent the pH value from becoming too low. This is achieved by removing part of the grid frame 4-1 and using the oil film collection and distribution device 13 to collect part of the oil film covering the surface of the fertilizer and water, allowing part of the fertilizer and water to be stored in the open until the pH value of the fertilizer and water recovers to above 6.0. Then, the oil film collection and distribution device 13 is used to cover the entire fertilizer and water with the oil film, and the grid frame 4-1 is replenished.

[0072] 4) Storage tank cleaning stage

[0073] When using fertilizer water from the fertilizer water storage tank for returning to the field, the sewage pump or discharge outlet should always be kept below the oil film 14 formed by silicone oil or its modified products. The sewage should not be completely discharged to ensure that the oil film 14 does not enter the farmland system. When cleaning the sludge at the bottom of the fertilizer water storage tank, the grid frame 4-1 is removed, and the oil film 14 on the surface of the fertilizer water is collected by the oil film collection and distribution device 13 to the side near the oil-water separator 12. The oil film 14 collected by the oil film collection and distribution device 13 is then pumped to the oil-water separator 12. The silicone oil or its modified products enter the silicone oil storage tank 11, and the fertilizer water flows back to the fertilizer water storage tank until the silicone oil or its modified products are completely removed. After that, the fertilizer water storage tank is cleaned.

[0074] Example 2

[0075] The only difference between Example 2 and Example 1 is that the thickness of the oil film 14 is 3 mm.

[0076] Example 3

[0077] The only difference between Example 2 and Example 1 is that the thickness of the oil film 14 is 7 mm.

[0078] Comparative Example 1

[0079] The only difference between Comparative Example 1 and Example 1 is that silicone oil and acidifier are not added to the fertilizer solution.

[0080] Comparative Example 2

[0081] The only difference between Comparative Example 2 and Example 1 is that silicone oil is not added to the fertilizer solution.

[0082] Comparative Example 3

[0083] The difference between Comparative Example 3 and Example 1 is that no acidifier is added to the fertilizer solution.

[0084] Experimental Example 1

[0085] The average control effect of the examples and comparative examples on odorous gases during 180 days of fertilizer and water storage was investigated, and the results are shown in Table 1 below.

[0086] Table 1 shows the control effect on malodorous gases.

[0087]

[0088] Note: In Table 1, "concentration mg / m³" 3 "" refers to the concentration of odorous gases in the ambient air around the septic tank (unorganized emissions), which is consistent with the method of expressing odor concentration in Table 1 of the "Odor Pollutant Emission Standard".

[0089] Experimental Example 2

[0090] The nutrient content in the fertilizer solution after storage in the examples and comparative examples was investigated, and the results are shown in Table 2 below.

[0091] Table 2 Nutrient content in the fertilizer solution after storage

[0092]

[0093] The above embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for storing fertilizer and water, characterized in that, The method for storing fertilizer and water employs a fertilizer and water storage device, which includes: Fertilizer storage tank; An oil feeding device is used to add silicone oil-based substances to the fertilizer storage tank. An acidifier feeding pipe is provided above the fertilizer and water storage tank; the acidifier feeding pipe is equipped with several acidifier nozzles for adding acidifier to the fertilizer and water storage tank; and an ammonia gas sensor is also provided on the acidifier feeding pipe. A control system, which is electrically connected to the ammonia sensor and the acidifier nozzle, is used to control the acidifier nozzle to spray acidifier into the area above the oil film where the ammonia concentration exceeds the standard when the ammonia sensor detects that the ammonia concentration exceeds the standard. The method for storing fertilizer and water includes the following steps: Add fertilizer to the fertilizer storage tank; Silicone oil is added to the fertilizer storage tank through an oil feeding device, and the silicone oil forms an oil film on the surface of the fertilizer. The thickness of the oil film is 4-6 mm; When the pH value of the fertilizer solution is below 5.5, collect part of the oil film covering the surface of the fertilizer solution, and store part of the fertilizer solution in the open air until the pH value of the fertilizer solution rises to above 6.

0.

2. The method for storing fertilizer and water according to claim 1, characterized in that, The fertilizer storage tank is provided with sliding tracks on both the left and right sides, and sliding frames are provided on the sliding tracks. The two ends of the acidifying agent feeding pipe are respectively connected to two sliding frames that slide on the sliding tracks.

3. The method for storing fertilizer and water according to claim 2, characterized in that, The sliding track is equipped with a position sensor, which is connected to an ammonia gas sensor and a control system. The control system controls the sliding frame and the acidifier nozzle.

4. The method for storing fertilizer and water according to any one of claims 1-3, characterized in that, Also includes: A three-dimensional mesh is horizontally set on the liquid surface of the fertilizer storage tank; the three-dimensional mesh is composed of several mesh frames, each mesh frame being hollow and enclosed by vertical borders, with a mesh screen installed on the side of any mesh frame facing the fertilizer storage tank.

5. The method for storing fertilizer and water according to claim 4, characterized in that, The mesh size is no greater than 0.15 mm.

6. The method for storing fertilizer and water according to claim 5, characterized in that, Several flow holes are provided on the vertical frame.

7. The method for storing fertilizer and water according to claim 6, characterized in that, The acidifier dosing pipe is controlled to pass over the entire fertilizer and water storage tank. The ammonia concentration above the fertilizer and water is monitored by the ammonia sensor on the acidifier dosing pipe. The acidifier is then sprayed into the area where the ammonia concentration exceeds the standard through the acidifier nozzle.

8. The method for storing fertilizer and water according to claim 7, characterized in that, Stop spraying acidifier when the pH of the fertilizer solution is below 6.0.

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