Fermentation apparatus for soil remediation

Abstract

The utility model provides a kind of fermentation device for soil remediation, comprising: hydrolysis component and acid production component, hydrolysis component is equipped with hydrolysis cavity, hydrolysis cavity is used to accommodate water and pretreated straw, to make straw carry out fermentation reaction in hydrolysis cavity;Acid production component is arranged below hydrolysis component, acid production component is equipped with acid production cavity, acid production cavity is communicated with hydrolysis cavity, and acid production cavity and hydrolysis cavity form sealed space;Acid production cavity is used to receive the fermentation broth that flows from hydrolysis cavity, to make fermentation broth carry out acid production reaction in acid production cavity under the action of acid production microorganism;Wherein, acid production component is equipped with the liquid discharge port communicated with acid production cavity, liquid discharge port is used to discharge the liquid after completing acid production reaction.This fermentation device effectively solves the technical problem that existing technology generally relies on a large amount of clean water and chemical reagent in the treatment of soil alkalization, with high cost, easy pollution, short-term effect, lack of long-term effectiveness and sustainability.

Description

Technical Field

[0001] This utility model relates to the technical field of fermentation equipment, specifically to a fermentation device for soil remediation. Background Technology

[0002] Saline-alkali land is a special type of land resource, characterized by a high concentration of alkaline salts, leading to a significant increase in soil pH. This highly alkaline environment severely inhibits normal plant growth and greatly limits the agricultural development potential of the affected areas. Currently, saline-alkali land remediation mainly relies on physical, chemical, and biological methods.

[0003] Physical methods primarily involve water conservancy engineering measures, such as drainage for salt leaching, freshwater diversion to suppress alkali growth, and irrigation leaching, aiming to reduce soil salinity through hydrodynamic processes. While these methods can alleviate soil salinization to some extent, their implementation heavily relies on large quantities of clean freshwater. In areas where groundwater already has high salinity, direct irrigation with groundwater not only has limited effectiveness but may even exacerbate soil salinization. Furthermore, long-term, excessive consumption of freshwater resources not only drives up agricultural costs but may also lead to secondary ecological problems such as regional water shortages and soil structure damage.

[0004] Chemical methods involve applying chemical amendments such as gypsum, phosphogypsum, sulfur, and humic acid to neutralize sodium ions or alkaline substances in the soil, thereby lowering the pH value and improving the soil's physical and chemical properties. While this method can show results in the short term and improve soil fertility, it also faces multiple challenges: on the one hand, the cost of amendments is high, and long-term large-scale application would be an economic burden; on the other hand, improper use could lead to soil compaction, heavy metal accumulation, or water pollution, posing potential risks to the ecological environment.

[0005] It is evident that both physical and chemical remediation methods have significant limitations: they are highly dependent on external resources (such as freshwater or chemical agents), have high operating costs, pose significant environmental risks, and are difficult to implement effectively in areas with high groundwater salinity. More importantly, existing technologies mostly focus on "stopgap measures"—they can only temporarily control the total amount of soil salinity for a few years, failing to fundamentally address the underlying mechanisms of saline-alkali land formation and re-salinization, and lacking long-term, sustainable remediation pathways.

[0006] Therefore, the existing technology still needs further development. Summary of the Invention

[0007] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide a fermentation device for soil remediation, so as to solve the technical problems of existing soil alkalization treatment technologies, which generally rely on large amounts of clean water and chemical agents, resulting in high costs, easy pollution, short-lived effects, lack of long-term effectiveness and sustainability.

[0008] To achieve the above-mentioned technical objectives, according to one aspect of this utility model: a fermentation device for soil remediation is provided, comprising: a hydrolysis component and an acid-producing component; the hydrolysis component is provided with a hydrolysis chamber for containing water and pretreated straw, so that the straw undergoes a fermentation reaction within the hydrolysis chamber; the acid-producing component is disposed below the hydrolysis component and is provided with an acid-producing chamber, which communicates with the hydrolysis chamber and forms a sealed space with the hydrolysis chamber; the acid-producing chamber is used to receive fermentation liquid flowing out from the hydrolysis chamber, so that the fermentation liquid undergoes an acid-producing reaction within the acid-producing chamber under the action of acid-producing microorganisms; wherein, the acid-producing component is provided with a drain port communicating with the acid-producing chamber, which is used to discharge the liquid after the acid-producing reaction is completed.

[0009] Furthermore, the acid-producing component includes: an acid-producing tank, which has an acid-producing chamber inside, and an inlet at the top of the acid-producing tank for communicating with the hydrolysis chamber; a biological carrier, which is placed inside the acid-producing chamber, and there is a gap between the biological carrier and the bottom wall of the acid-producing chamber; the biological carrier has a porous structure, and acid-producing microorganisms are attached to the biological carrier.

[0010] Furthermore, the acid-producing component also includes: an aeration plate, which is disposed at the bottom of the acid-producing tank, with at least a portion of the aeration plate located within the acid-producing chamber, and is used to introduce gas into the acid-producing chamber; a dissolved oxygen detector, which is disposed on the inner wall of the acid-producing chamber, and is used to detect the dissolved oxygen concentration within the acid-producing chamber; the aeration plate is selectively started and stopped according to the dissolved oxygen concentration detected by the dissolved oxygen detector; wherein, when the dissolved oxygen concentration detected by the dissolved oxygen detector is less than a first preset concentration threshold, the aeration plate starts and introduces gas into the acid-producing chamber; when the dissolved oxygen concentration detected by the dissolved oxygen detector is greater than or equal to a second preset concentration threshold, the aeration plate stops operating; the first preset concentration threshold is less than the second preset concentration threshold.

[0011] Furthermore, the acid-producing component also includes: a first stirring assembly, which is disposed on the acid-producing tank and the stirring part of the first stirring assembly is located inside the acid-producing chamber, and the stirring part of the first stirring assembly and the biological carrier are spaced apart along the height direction; a first driving assembly, which is disposed on the acid-producing tank; the driving end of the first driving assembly is drivenly connected to the first stirring assembly, and the first driving assembly is used to drive the first stirring assembly to move so that the stirring part of the first stirring assembly stirs the liquid in the acid-producing chamber.

[0012] Further, the first stirring assembly includes: a first transmission gear and a first stirring element. The first transmission gear is rotatably disposed at the top of the acid-producing tank and is spaced apart from the liquid inlet. At least a portion of the first stirring element is disposed within the acid-producing chamber. The first stirring element has a first connecting portion and a first stirring portion connected in sequence. The end of the first connecting portion away from the first stirring portion is connected to the first transmission gear. The first stirring portion forms the stirring portion of the first stirring assembly. The first driving assembly includes: a first support member and a first rocker arm. The first support member is disposed at the top of the acid-producing tank. The first rocker arm is rotatably disposed through the first support member. The first rocker arm has a first meshing section. The first meshing section is provided with a first helical tooth pattern adapted to the first transmission gear. The first meshing section is meshed with the first transmission gear through the first helical tooth pattern to drive the first transmission gear to rotate when the first rocker arm rotates.

[0013] Furthermore, the acid-producing component also includes: a first heating element disposed on the acid-producing tank, the first heating element being used to heat the liquid in the acid-producing chamber; a first temperature sensor disposed on the inner wall of the acid-producing chamber, the first temperature sensor being used to detect the temperature in the acid-producing chamber; the first heating element being selectively activated and deactivated according to the temperature detected by the first temperature sensor; wherein, when the temperature detected by the first temperature sensor is less than a first preset temperature threshold, the first heating element is activated and heats the liquid in the acid-producing chamber; when the temperature detected by the first temperature sensor is greater than or equal to a second preset temperature threshold, the first heating element stops heating; the first preset temperature threshold is less than the second preset temperature threshold.

[0014] Furthermore, the acid-producing component also includes: a first solar panel, which is disposed on the outer wall of the acid-producing tank, and is used to absorb solar radiation energy and convert it into electrical energy; the fermentation device also includes: an energy storage component, which is disposed at the top of the acid-producing tank, and is electrically connected to the first solar panel and the power-consuming unit of the acid-producing component, respectively, and is used to store the electrical energy converted by the first solar panel and to supply power to the power-consuming unit of the acid-producing component.

[0015] Furthermore, the hydrolysis component includes: a hydrolysis tank, which is positioned above the acid-producing tank, with a gap between the hydrolysis tank and the acid-producing tank; a hydrolysis chamber is provided inside the hydrolysis tank; an outlet connected to the hydrolysis chamber is opened at the bottom of the hydrolysis tank, and the outlet is connected to the inlet through a connecting pipe; the fermentation device also includes: a plurality of first support columns, which are spaced apart at the bottom of the hydrolysis tank, and the hydrolysis tank is supported above the acid-producing tank by the various first support columns.

[0016] Furthermore, the hydrolysis component also includes: a separator, which is disposed inside the hydrolysis chamber and located at the top of the hydrolysis chamber. The separator is used to divide the hydrolysis chamber into at least two compartments along the circumferential direction of the hydrolysis tank; wherein the dividing part of the separator has a porous honeycomb structure.

[0017] Furthermore, the hydrolysis component also includes: a second stirring assembly, which is disposed on the hydrolysis tank and the stirring part of the second stirring assembly is located inside the hydrolysis chamber; and a second driving assembly, which is disposed on the hydrolysis tank; the driving end of the second driving assembly is drivenly connected to the second stirring assembly, and the second driving assembly is used to drive the second stirring assembly to rotate so that the stirring part of the second stirring assembly stirs the material inside the hydrolysis chamber.

[0018] Beneficial effects: Applying the technical solution of this utility model, the fermentation device for soil remediation provided by this utility model includes a hydrolysis component and an acid-producing component. The overall structure includes the hydrolysis component and the acid-producing component, which are arranged vertically and function synergistically to form an integrated, sealed two-stage biological fermentation system. Specifically, the hydrolysis component has a hydrolysis chamber for containing water and pretreated straw, allowing the straw to undergo a fermentation reaction within the hydrolysis chamber to generate fermentation broth. The acid-producing component is located below the hydrolysis component and has an acid-producing chamber that communicates with the hydrolysis chamber, forming a sealed space to effectively prevent gas escape and external contamination, while maintaining a stable reaction environment. The acid-producing chamber receives the fermented broth flowing out of the hydrolysis chamber, allowing the fermented broth to undergo an acid-producing reaction within the acid-producing chamber under the action of acid-producing microorganisms. The acid-producing component has a drain port communicating with the acid-producing chamber for discharging the liquid after the acid-producing reaction is completed.

[0019] Therefore, by setting up independent hydrolysis and acid-producing components, efficient hydrolysis of straw and targeted generation of organic acids can be achieved respectively. The hydrolysis component utilizes local agricultural waste such as straw to complete biological pretreatment under low water consumption conditions, significantly reducing dependence on clean water sources. The acid-producing component converts the hydrolysis products into high-concentration organic acids without adding any chemical agents, effectively avoiding the risks of soil compaction and secondary pollution that may be caused by traditional soil conditioners such as gypsum and sulfur. The two components optimize reaction conditions, which not only improves substrate conversion efficiency but also enhances product stability. The straw waste remaining after the acid-producing process can be directly returned to the field, greatly shortening the natural decomposition cycle and providing a new, efficient, and environmentally friendly path for straw resource utilization. At the same time, the hydrolysis and acid-producing components adopt an upper and lower arrangement and sealed connection structure design, with materials transferred by gravity, constructing a closed-loop, low-energy-consumption, and near-zero-emission biological acid-producing system. This collaborative architecture completely eliminates the reliance on large amounts of fresh water and chemical amendments. The fermentation broth produced possesses multiple functions, including reducing alkali, desalinizing, increasing carbon, and promoting the growth of live bacteria, significantly enhancing the long-term effectiveness and sustainability of soil remediation and realizing a new green governance model of "treating alkali with waste and recycling on-site." Furthermore, the acidic substances generated by the acid production reaction are natural organic acids, which do not introduce additional inorganic salt ions into the soil and avoid the damage to soil structure and ecological functions caused by chemical amendments. In summary, this fermentation device for soil remediation has a simple structure, is easy to operate, can be directly deployed in the field, and supports continuous acid production operations. It is not only suitable for saline-alkali land remediation but can also be widely applied to other soil remediation scenarios requiring acidic agents. This fermentation device for soil remediation effectively solves the technical problems of existing soil alkalization remediation technologies, which generally rely on large amounts of clean water and chemical agents, resulting in high costs, easy pollution, short-lived effects, and a lack of long-term effectiveness and sustainability. Attached Figure Description

[0020] Figure 1 A schematic diagram of the structure of a fermentation device for soil remediation according to the present invention is shown; Figure 2 A schematic diagram showing the connection between the acid-producing tank, the biological carrier, and the heating element in a fermentation apparatus for soil remediation according to the present invention is shown. Figure 3 A schematic diagram of the structure of the first drive component in the fermentation device for soil remediation provided according to the present invention is shown; Figure 4 A schematic diagram showing the connection between the hydrolysis tank and the separator in the fermentation apparatus for soil remediation provided according to the present invention is shown. Figure 5 A schematic diagram of the structure of the second drive component in the fermentation device for soil remediation provided according to the present invention is shown; Figure 6A schematic diagram of the structure of the separator in the fermentation device for soil remediation provided according to the present invention is shown.

[0021] The above figures include the following reference numerals: 1. Hydrolysis component; 10. Hydrolysis chamber; 11. Hydrolysis tank; 110. Liquid outlet; 111. Hydrolysis tank body; 112. Hydrolysis cover; 113. Second sealing strip; 12. Divider; 121. Support sleeve; 122. Divider plate; 13. Second stirring assembly; 131. Second transmission gear; 132. Second stirring component; 1321. Second transmission shaft; 1322. Second stirring blade; 14. Second drive assembly; 141. Second support component; 142. Second rocker arm; 1421. Second meshing section; 15. Second heating component; 16. Second temperature sensor; 17. Second solar panel; 18. Third insulation layer; 19. Fourth insulation layer; 2. Acid-producing component; 20. Acid-producing chamber; 21. 210. Acid-producing tank; 211. Inlet; 212. Acid-producing tank body; 213. First sealing strip; 22. Biological carrier; 23. Aeration plate; 24. Dissolved oxygen detector; 25. First stirring assembly; 251. First transmission gear; 252. First stirring element; 2521. First transmission shaft; 2522. First stirring blade; 26. First drive assembly; 261. First support element; 262. First rocker arm; 2621. First meshing section; 27. First heating element; 28. First temperature sensor; 29. ​​First solar panel; 3. Energy storage component; 4. First support column; 5. Second support column; 6. Drain pipe; 7. First insulation layer; 8. Connecting pipe; 100. Second insulation layer. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0023] Please see Figures 1 to 6According to an embodiment of the present invention, a fermentation device for soil remediation is provided, comprising: a hydrolysis component 1 and an acid-producing component 2. The hydrolysis component 1 is provided with a hydrolysis chamber 10, which is used to contain water and pretreated straw, so that the straw undergoes a fermentation reaction within the hydrolysis chamber 10. The acid-producing component 2 is disposed below the hydrolysis component 1 and is provided with an acid-producing chamber 20, which is connected to the hydrolysis chamber 10 and forms a sealed space with the hydrolysis chamber 10. The acid-producing chamber 20 is used to receive the fermentation liquid flowing out of the hydrolysis chamber 10, so that the fermentation liquid undergoes an acid-producing reaction within the acid-producing chamber 20 under the action of acid-producing microorganisms. The acid-producing component 2 is provided with a drain port connected to the acid-producing chamber 20, which is used to discharge the liquid after the acid-producing reaction is completed.

[0024] As can be seen, the fermentation device for soil remediation provided by this utility model includes a hydrolysis component 1 and an acid-producing component 2. The overall structure includes the hydrolysis component 1 and the acid-producing component 2, which are arranged vertically and function synergistically to form an integrated, sealed two-stage biological fermentation system. Specifically, the hydrolysis component 1 has a hydrolysis chamber 10, which is used to contain water and pretreated straw, allowing the straw to undergo a fermentation reaction within the hydrolysis chamber 10 to generate fermentation liquid. The acid-producing component 2 is located below the hydrolysis component 1 and has an acid-producing chamber 20. The acid-producing chamber 20 communicates with the hydrolysis chamber 10, and the acid-producing chamber 20 and the hydrolysis chamber 10 form a sealed space, effectively preventing gas escape and external pollution while maintaining a stable reaction environment. The acid-producing chamber 20 is used to receive the fermented liquid that has completed fermentation from the hydrolysis chamber 10, allowing the fermentation liquid to undergo an acid-producing reaction within the acid-producing chamber 20 under the action of acid-producing microorganisms. The acid-producing component 2 is provided with a drain port that communicates with the acid-producing chamber 20. The drain port is used to discharge the liquid after the acid-producing reaction is completed.

[0025] Therefore, by setting up independent hydrolysis unit 1 and acid-producing unit 2, efficient hydrolysis of straw and targeted generation of organic acids can be achieved, respectively. Hydrolysis unit 1 utilizes local agricultural waste (such as straw) to complete biological pretreatment under low water consumption conditions, significantly reducing dependence on clean water sources. Acid-producing unit 2 converts the hydrolysis products into high-concentration organic acids without adding any chemical agents, effectively avoiding the risks of soil compaction and secondary pollution that may be caused by traditional soil conditioners such as gypsum and sulfur. The two units optimize reaction conditions, which not only improves substrate conversion efficiency but also enhances product stability. The straw waste remaining after the acid-producing process can be directly returned to the field, greatly shortening the natural decomposition cycle and providing a new, efficient, and environmentally friendly path for straw resource utilization. At the same time, the hydrolysis unit 1 and acid-producing unit 2 adopt an upper and lower arrangement and sealed connection structure design, with materials transferred by gravity, constructing a closed-loop, low-energy-consumption, and near-zero-emission biological acid-producing system. This collaborative architecture completely eliminates the reliance on large amounts of fresh water and chemical amendments. The fermentation broth produced possesses multiple functions, including reducing alkali, desalinizing, increasing carbon, and promoting the growth of live bacteria, significantly enhancing the long-term effectiveness and sustainability of soil remediation and realizing a new green governance model of "treating alkali with waste and recycling on-site." Furthermore, the acidic substances generated by the acid production reaction are natural organic acids, which do not introduce additional inorganic salt ions into the soil and avoid the damage to soil structure and ecological functions caused by chemical amendments. In summary, this fermentation device for soil remediation has a simple structure, is easy to operate, can be directly deployed in the field, and supports continuous acid production operations. It is not only suitable for saline-alkali land remediation but can also be widely applied to other soil remediation scenarios requiring acidic agents. This fermentation device for soil remediation effectively solves the technical problems of existing soil alkalization remediation technologies, which generally rely on large amounts of clean water and chemical agents, resulting in high costs, easy pollution, short-lived effects, and a lack of long-term effectiveness and sustainability.

[0026] The aforementioned "pre-treated straw" refers to the straw being cut short and inoculated with fermentation bacteria before being placed into the hydrolysis chamber 10, and then packaged into mesh bags.

[0027] The fermentation broth contains soluble hydrolysis products produced by the hydrolysis of straw. When the fermentation broth enters the acid-producing chamber 20, the hydrolysis products are further converted into high-concentration organic acids under the action of acid-producing microorganisms.

[0028] Furthermore, the acid-producing tank 21 is equipped with a sealable drain pipe 6 on its side wall, and the drain pipe 6 is located at the bottom of the acid-producing tank 21. The inlet end of the drain pipe 6 is connected to the acid-producing chamber 20, and its outlet end forms a drain port. During the acid-producing reaction, the drain pipe 6 is in a sealed state to maintain the airtightness of the acid-producing chamber 20; when it is necessary to discharge the liquid that has completed the acid-producing reaction, the drain pipe 6 switches to a connected state to achieve directional discharge of the acidified liquid.

[0029] Specifically, such as Figures 1 to 3 As shown, the acid-producing component 2 includes: an acid-producing tank 21, which has an acid-producing chamber 20 inside, and an inlet 210 at the top of the acid-producing tank 21 for communicating with the hydrolysis chamber 10; a biological carrier 22, which is disposed inside the acid-producing chamber 20, and there is a gap between the biological carrier 22 and the bottom wall of the acid-producing chamber 20; the biological carrier 22 has a porous structure, and acid-producing microorganisms are attached to the biological carrier 22.

[0030] By employing the above-described structural design and placing a biological carrier 22 within the acid-producing chamber 20, the acid-producing efficiency and system operational stability can be significantly improved. The biological carrier 22, with its porous structure and large specific surface area, provides ample attachment surface for acid-producing microorganisms, promoting the formation of a highly active biofilm, effectively enhancing the microbial accumulation capacity and preventing loss with the liquid. Simultaneously, a certain gap is reserved between the biological carrier 22 and the bottom wall of the acid-producing chamber 20, facilitating uniform flow and distribution of the fermentation broth and avoiding localized dead zones. When the fermentation broth flows from the hydrolysis component 1 into the acid-producing chamber 20, the hydrolysis products can undergo rapid and stable directional acidification reactions on the surface of the biological carrier 22, significantly improving the conversion efficiency and yield of organic acids and enhancing the system's resistance to load fluctuations and environmental changes. This provides a continuous and stable supply of high-concentration, high-quality acidified liquid for soil improvement.

[0031] Furthermore, the biological carrier 22 is fixed to the bottom wall of the acid-producing chamber 20 by the second support column 5, thereby forming a gap between the biological carrier 22 and the bottom wall of the acid-producing chamber 20.

[0032] Optionally, the biological carrier 22 is a microporous filter plate with a uniform microporous structure inside, which allows acid-producing microorganisms to attach and grow. The microporous filter plate can be made of a mixed cellulose ester material.

[0033] Among them, "acid-producing microorganisms" refers to a class of microorganisms that can generate organic acids by metabolizing organic matter.

[0034] Alternatively, the acid-producing microorganism is an acid-producing bacterium (also known as "acid-producing bacteria").

[0035] Specifically, such as Figure 1 and Figure 2As shown, the acid-producing component 2 further includes: an aeration plate 23, which is disposed at the bottom of the acid-producing tank 21, with at least a portion of the aeration plate 23 located within the acid-producing chamber, and at least a portion of the aeration plate 23 protruding from the bottom wall of the acid-producing chamber 20; the aeration plate 23 is used to introduce gas into the acid-producing chamber 20; and a dissolved oxygen detector 24, which is disposed on the inner wall of the acid-producing chamber 20 and is used to detect the dissolved oxygen concentration within the acid-producing chamber 20. The aeration plate 23 is selectively started and stopped according to the dissolved oxygen concentration detected by the dissolved oxygen detector 24. Specifically, when the dissolved oxygen concentration detected by the dissolved oxygen detector 24 is less than a first preset concentration threshold, the aeration plate 23 starts and introduces gas into the acid-producing chamber 20; when the dissolved oxygen concentration detected by the dissolved oxygen detector 24 is greater than or equal to a second preset concentration threshold, the aeration plate 23 stops operating; the first preset concentration threshold is less than the second preset concentration threshold.

[0036] By adopting the above-described structural design, an aeration plate 23 is installed on the bottom wall of the acid-producing tank 21, providing the necessary micro-oxygen environment for the acid-producing microorganisms in the acid-producing chamber 20. Simultaneously, the aeration plate 23 and the dissolved oxygen detector 24 on the inner wall of the acid-producing chamber 20 work together to form a closed-loop feedback control system, achieving precise and dynamic regulation of dissolved oxygen concentration during acid production: when the dissolved oxygen concentration is detected to be lower than a first preset threshold, the system automatically starts aeration; when the dissolved oxygen concentration is higher than a second preset threshold, the aeration supply is stopped. The first preset threshold being lower than the second preset threshold forms a hysteresis control range, effectively preventing frequent start-ups and shutdowns due to minor fluctuations. This design introduces trace amounts of oxygen to inhibit unwanted bacteria (such as sulfate-reducing bacteria and other odor-causing anaerobic bacteria) and improve the fermentation environment, while preventing excessive aeration from damaging the facultative anaerobic metabolic characteristics of the acid-producing microorganisms. Therefore, while ensuring efficient organic acid production, it significantly improves the stability of system operation and product quality, providing a more reliable and controllable biological acid source for soil improvement.

[0037] Optionally, the aeration plate 23 is embedded into the acid-producing chamber 20 from the bottom end face of the acid-producing tank 21 and protrudes from the bottom wall of the acid-producing chamber 20; the aeration plate 23 is connected to an external motor, which is powered by the energy storage component 3.

[0038] Optionally, during the acid production process, when the dissolved oxygen detector 24 detects that the dissolved oxygen concentration of the fermentation broth in the acid production chamber 20 is lower than 0.05 mg / L, the aeration plate 23 is activated to introduce gas into the acid production chamber 20; when the dissolved oxygen detector 24 detects that the dissolved oxygen concentration of the fermentation broth in the acid production chamber 20 reaches or exceeds 0.15 mg / L, the aeration plate 23 stops working, thereby stabilizing the dissolved oxygen concentration within the micro-oxygen range of 0.05 to 0.15 mg / L, taking into account both the activity of acid-producing microorganisms and the inhibition of miscellaneous bacteria.

[0039] Specifically, such as Figures 1 to 3As shown, the acid-producing component 2 further includes: a first stirring assembly 25, which is disposed on the acid-producing tank 21, and the stirring part of the first stirring assembly 25 is located inside the acid-producing chamber 20. The stirring part of the first stirring assembly 25 and the biological carrier 22 are spaced apart along the height direction, and the stirring part of the first stirring assembly 25 is located above the biological carrier 22; and a first driving assembly 26, which is disposed on the acid-producing tank 21. The driving end of the first driving assembly 26 is drivenly connected to the first stirring assembly 25, and the first driving assembly 26 is used to drive the first stirring assembly 25 to move so that the stirring part of the first stirring assembly 25 stirs the liquid in the acid-producing chamber 20.

[0040] With the above-described structural arrangement, the stirring section of the first stirring assembly 25 and the biological carrier 22 are spaced apart along the height direction, with the stirring section positioned above the biological carrier 22. This design allows for gentle and effective stirring of the liquid within the acid-producing chamber 20 without disturbing or damaging the acid-producing microbial film attached to the surface of the biological carrier 22. This arrangement significantly improves the mass transfer efficiency between the fermentation broth and the acid-producing microorganisms, allowing hydrolysis products to be more evenly distributed and fully contact the biological carrier 22, thereby accelerating the rate of organic acid generation. Furthermore, it effectively avoids the scouring or stripping of the biofilm caused by traditional bottom stirring, ensuring the stability and metabolic activity of the microbial community. Simultaneously, stirring helps eliminate excessively high substrate concentrations or excessive organic acid accumulation in localized areas, preventing drastic pH fluctuations and concentration gradients, and maintaining a uniform and stable acid-producing environment. In addition, the first stirring component 25 is continuously driven by the first driving component 26, which further enhances the overall mixing effect of the liquid in the acid production chamber 20. This not only improves the system reaction efficiency and operational stability, but also ensures the consistency of the acidified liquid quality, providing a continuous, efficient and controllable biological acid source for soil improvement.

[0041] Furthermore, such as Figures 1 to 3As shown, the first stirring assembly 25 includes: a first transmission gear 251 and a first stirring element 252. The first transmission gear 251 is rotatably disposed at the top of the acid-producing tank 21, and the first transmission gear 251 is spaced apart from the liquid inlet 210. At least a portion of the first stirring element 252 is disposed within the acid-producing chamber 20. The first stirring element 252 has a first connecting portion and a first stirring portion connected in sequence. The end of the first connecting portion away from the first stirring portion is connected to the first transmission gear 251. The first stirring portion forms the stirring portion of the first stirring assembly 25. The drive assembly 26 includes a first support member 261 and a first rocker arm 262. The first support member 261 is disposed at the top of the acid production tank 21. The first rocker arm 262 is rotatably inserted through the first support member 261. The first rocker arm 262 has a first meshing section 2621. The first meshing section 2621 is provided with a first spiral tooth pattern adapted to the first transmission gear 251. The first meshing section 2621 is meshed with the first transmission gear 251 through the first spiral tooth pattern so as to drive the first transmission gear 251 to rotate when the first rocker arm 262 rotates.

[0042] By adopting the above-described structural configuration, and by rotatably mounting the first transmission gear 251 at the top of the acid-producing tank 21 and maintaining a distance from the liquid inlet 210, spatial interference between the transmission mechanism and the liquid inlet channel is effectively avoided. This ensures the smooth flow of the fermentation broth and improves the sealing reliability of the tank top. The first stirring element 252 is connected to the first transmission gear 251 via the first connecting part. Its stirring part extends into the acid-producing chamber 20 and is located above the biological carrier 22. While achieving efficient stirring of the liquid, it avoids scouring or disturbing the acid-producing microbial film attached to the surface of the biological carrier, which is beneficial to maintaining the stability and activity of the microbial community. At the same time, the first drive assembly 26 adopts a combination structure of the first support 261 and the rotatable first rocker arm 262. The first rocker arm 262 is provided with a first meshing section 2621 with a first spiral tooth pattern. This first meshing section 2621 and the first transmission gear 251 form a stable worm gear transmission. This transmission system features a compact structure, stable operation, and low noise. It efficiently and reliably converts the rotational motion of the first rocker arm 262 into the continuous stirring action of the first stirring element 252, ensuring thorough and uniform mixing of the liquid within the acid-producing chamber 20 and significantly improving mass transfer efficiency and reaction stability. Furthermore, the first rocker arm 262 is exposed outside the acid-producing tank 21, allowing operators to manually operate it or control its rotation via an external drive device, thus driving the stirring operation without disassembling or removing the hydrolysis component 1. This design greatly enhances the ease of operation and maintenance efficiency of the equipment, avoiding seal failure, component wear, or system downtime caused by frequent disassembly and assembly, while maintaining the integrity and airtightness of the overall structure. In summary, this stirring and transmission system balances airtightness, operational stability, low disturbance to the biofilm, and mixing efficiency in its structural layout. It not only effectively protects the activity and metabolic function of acid-producing microorganisms but also optimizes the uniformity of the acid-producing reaction environment, thereby significantly improving the yield and quality of organic acids and providing an efficient, reliable, and sustainable biological acid source solution for soil improvement.

[0043] Furthermore, the first rocker arm 262 includes a first hand-held part and a first rocker arm body. One end of the first rocker arm body is connected to the first hand-held part, which is located outside the acid production tank 21 for easy manual operation. The other end of the first rocker arm body is provided with a first meshing section 2621, which passes through the first support member 261 and extends toward the first transmission gear 251, so that the first meshing section 2621 and the first transmission gear 251 can mesh together.

[0044] Optionally, the first meshing section 2621 is configured as a worm gear, and the first transmission gear 251 is a matching worm wheel. Together, they form a worm gear transmission pair, thereby achieving the function of smooth transmission.

[0045] Furthermore, the first support member 261 has a first mounting hole provided along the extension direction of the first rocker body, and a first bearing is provided in the first mounting hole; the first engaging section 2621 of the first rocker body passes through the first bearing and engages with the first transmission gear 251.

[0046] Furthermore, the first stirring element 252 has a first drive shaft 2521 and two first stirring blades 2522. The first drive shaft 2521 extends along the height direction of the acid-producing tank 21. One end of the first drive shaft 2521 is connected to a first drive gear 251, and the other end of the first drive shaft 2521 is connected to the two first stirring blades 2522. At least a portion of the first drive shaft 2521 is located within the acid-producing chamber 20. The first drive shaft 2521 forms a first connecting portion of the first stirring element 252, and the two first stirring blades 2522 form a first stirring portion of the first stirring element 252.

[0047] Optionally, the first agitator 252 is made of 304 stainless steel.

[0048] Furthermore, the acid-producing tank 21 includes an acid-producing tank body 211 and an acid-producing cover 212, with the cover 212 covering the acid-producing tank body 211, together forming an acid-producing chamber 20. An inlet 210 is located on the cover 212, a first transmission gear 251 is rotatably mounted on the cover 212, and a first drive assembly 26 is also located on the cover 212.

[0049] Furthermore, a first sealing strip 213 is provided around the periphery of the acid-producing cover 212. When the acid-producing cover 212 is closed on the acid-producing tank 211, the first sealing strip 213 achieves an effective seal between the two.

[0050] Specifically, such as Figures 1 to 3 As shown, the acid-producing component 2 further includes: a first heating element 27, which is disposed on the acid-producing tank 21 and is used to heat the liquid in the acid-producing chamber 20; a first temperature sensor 28, which is disposed on the inner wall of the acid-producing chamber 20 and is used to detect the temperature in the acid-producing chamber 20; the first heating element 27 is selectively started and stopped according to the temperature detected by the first temperature sensor 28; wherein, when the temperature detected by the first temperature sensor 28 is less than a first preset temperature threshold, the first heating element 27 is started and heats the liquid in the acid-producing chamber 20; when the temperature detected by the first temperature sensor 28 is greater than or equal to a second preset temperature threshold, the first heating element 27 stops heating; the first preset temperature threshold is less than the second preset temperature threshold.

[0051] By adopting the above structural configuration, a closed-loop temperature control system is constructed by installing a first heating element 27 on the acid-producing tank 21 and arranging a first temperature sensor 28 on the inner wall of the acid-producing chamber 20. The first heating element 27 can automatically start and stop based on the real-time temperature data fed back by the first temperature sensor 28: heating is started when the temperature inside the chamber is lower than a first preset temperature threshold to ensure that the acid-producing microorganisms are within a suitable active temperature range, thereby maintaining efficient metabolism and organic acid production rate; heating is stopped when the temperature rises to or exceeds a second preset temperature threshold to prevent overheating from inhibiting microbial activity or causing side reactions. The first preset temperature threshold is lower than the second preset temperature threshold, forming a reasonable hysteresis range, effectively avoiding frequent start-stop of the heating device due to small temperature fluctuations, and extending the equipment's service life. This design not only ensures stable operation of the acid-producing process under optimal temperature conditions, significantly improving the yield of organic acids and reaction consistency, but also enhances the system's adaptability to changes in environmental temperature (such as diurnal temperature variation and seasonal changes), making it particularly suitable for open-air deployment in fields. At the same time, precise temperature control helps maintain the stability of the microbial community structure, reduces the risk of the growth of miscellaneous bacteria, further improves the quality of acidification solution, and provides a continuous, reliable and efficient biological acid source for soil improvement.

[0052] Furthermore, the first heating element 27 is located inside the acid-producing chamber 20 and close to the inner wall of the acid-producing chamber 20. The first heating element 27 is spaced apart from the first temperature sensor 28 and the dissolved oxygen detector 24, and the first temperature sensor 28 and the dissolved oxygen detector 24 are also spaced apart.

[0053] Optionally, the first temperature sensor 28 and the dissolved oxygen detector 24 are spaced apart along the height direction, and the first temperature sensor 28 is located above the dissolved oxygen detector 24.

[0054] Optionally, the first heating element 27 may be made of materials such as stainless steel or aluminum alloy.

[0055] Optionally, the temperature of the fermentation broth is maintained between 30°C and 35°C during the acid production process: when the first temperature sensor 28 detects that the temperature inside the acid production chamber 20 is below 30°C, the first heating element 27 is activated and begins heating; when the temperature is detected to reach or exceed 35°C, the first heating element 27 stops heating, thereby achieving precise control of the acid production environment temperature.

[0056] Specifically, such as Figures 1 to 3As shown, the acid-producing component 2 further includes: a first solar panel 29, which is disposed on the outer wall of the acid-producing tank 21. The first solar panel 29 is used to absorb solar radiation energy and convert it into electrical energy. The fermentation device further includes: an energy storage component 3, which is disposed at the top of the acid-producing tank 21. The energy storage component 3 is electrically connected to the first solar panel 29 and the power-consuming unit of the acid-producing component 2, respectively. The energy storage component 3 is used to store the electrical energy converted by the first solar panel 29 and to supply power to the power-consuming unit of the acid-producing component 2.

[0057] By adopting the above-described structural configuration, a self-sufficient green energy supply system is constructed by installing a first solar panel 29 on the outer wall of the acid-producing tank 21 and combining it with an energy storage component 3 located at the top of the acid-producing tank 21. The first solar panel 29 converts solar radiation energy into electrical energy, which is stored by the energy storage component 3 and provides stable power support for the power-consuming units in the acid-producing component 2 (such as the first heating element 27, aeration plate 23, dissolved oxygen detector 24, first temperature sensor 28, etc.). This design significantly reduces dependence on external power grids or fossil fuels, and is particularly suitable for soil remediation scenarios in fields, remote areas, or without power access, improving the deployment flexibility and operational sustainability of the device. At the same time, using clean solar energy for power supply not only reduces carbon emissions and operating costs, but also achieves the dual ecological benefits of "treating alkali with waste" and "green energy driving".

[0058] Furthermore, the energy storage component 3 is disposed on the acid-producing cover 212 and is arranged at intervals with the first transmission gear 251, the first drive assembly 26 and the liquid inlet 210 to avoid structural interference and ensure that each functional unit operates independently and reliably.

[0059] Optionally, the energy storage component 3 is an energy storage battery. The power-consuming unit of the acid-generating component 2 includes an aeration plate 23, a first heating element 27, a first temperature sensor 28, and a dissolved oxygen detector 24.

[0060] Furthermore, the first solar panel 29 is arc-shaped and wraps around the outer wall of the acid production tank 21 to maximize the area for receiving solar radiation, improve photoelectric conversion efficiency, and at the same time take into account the compactness and aesthetics of the overall structure.

[0061] Furthermore, the acid-generating component 2 also includes a first insulation layer 7, which wraps around the outer wall of the acid-generating tank 21 to reduce heat loss and maintain a stable temperature inside the acid-generating chamber 20. The first solar panel 29 is disposed outside the first insulation layer 7, that is, it is completely covered outside the first insulation layer 7, which does not affect the insulation performance and can fully receive solar radiation.

[0062] Optionally, the first insulation layer 7 is made of polyurethane foam material; given that the temperature required to be maintained by the acid-producing tank 21 is not high, the surface of the insulation layer is preferably light-colored to reduce the risk of overheating caused by solar radiation heat absorption, while taking into account the synergistic effect of insulation and temperature control. The first solar panel 29 only covers part of the outer wall of the acid-producing tank 21.

[0063] Furthermore, the acid-generating component 2 also includes a second insulation layer 100, which covers the outer surface of the acid-generating cover 212 to reduce heat loss from the top and improve the overall insulation effect.

[0064] Optionally, the second insulation layer 100 may be made of materials such as polyurethane foam.

[0065] Specifically, such as Figure 1 , Figure 4 and Figure 5 As shown, the hydrolysis component 1 includes: a hydrolysis tank 11, which is positioned above the acid-producing tank 21, with a gap between the hydrolysis tank 11 and the acid-producing tank 21; a hydrolysis chamber 10 is provided inside the hydrolysis tank 11; an outlet 110 connected to the hydrolysis chamber 10 is provided at the bottom end of the hydrolysis tank 11, and the outlet 110 is connected to the inlet 210 through a connecting pipe 8; the fermentation device also includes: a plurality of first support columns 4, which are spaced apart at the bottom end of the hydrolysis tank 11, and the hydrolysis tank 11 is supported above the acid-producing tank 21 by the various first support columns 4.

[0066] By adopting the above-described structural configuration, the hydrolysis tank 11 is positioned above the acid-producing tank 21 and stably supported by multiple first support columns 4, maintaining an appropriate gap between them. This not only provides ample operating space for the installation and maintenance of components such as the connecting pipe 8, the first drive assembly 26, and the energy storage component 3, but also effectively improves the overall structural stability. Simultaneously, the first support columns 4, acting as load-bearing support structures, prevent the hydrolysis tank 11 from directly bearing the load on the acid-producing tank 21, thus protecting the acid-producing tank 21 from mechanical damage or deformation. Furthermore, after the hydrolysis chamber 10 within the hydrolysis tank 11 completes the straw pretreatment, the resulting fermentation liquid can naturally flow into the inlet 210 of the acid-producing tank 21 through the bottom outlet 110 by gravity, eliminating the need for an additional transfer pump, significantly reducing energy consumption, and achieving gravity-flow material transfer. This split-type layout achieves physical isolation and process synergy between the hydrolysis and acid production units: on the one hand, it effectively avoids cross-interference between the two-stage reactions, facilitating the optimization of their respective reaction conditions; on the other hand, it simplifies system integration, which is beneficial for modular design, mass production, and rapid field deployment. Meanwhile, the gravity flow design reduces the risk of pipeline blockage and operational failure rate, further improving the reliability and long-term operational stability of the device, providing a low-energy, high-efficiency, and easy-to-maintain integrated bio-fermentation solution for soil improvement.

[0067] Furthermore, the connecting pipe 8 is equipped with a control valve that can be switched on and off. When the fermentation reaction is not complete, the control valve is in the closed state, preventing the liquid in the hydrolysis chamber 10 from flowing into the acid-producing chamber 20; after the fermentation reaction is completed, the control valve is opened, allowing the liquid in the hydrolysis chamber 10 to flow into the acid-producing chamber 20 through the connecting pipe 8 under its own gravity, thus realizing the orderly connection and precise control of the two-stage reaction.

[0068] Specifically, such as Figure 1 and Figure 4 As shown, the hydrolysis component 1 further includes a separator 12, which is disposed inside the hydrolysis chamber 10 and located at the top of the hydrolysis chamber 10. The separator 12 is used to divide the hydrolysis chamber 10 into at least two compartments along the circumferential direction of the hydrolysis tank 11. The separator portion of the separator 12 has a porous honeycomb structure.

[0069] By adopting the above-described structural design, and by setting a separator 12 at the top of the hydrolysis chamber 10 and designing it as a porous honeycomb structure, the hydrolysis chamber 10 can be divided into at least two relatively independent compartments along the circumference of the hydrolysis tank 11. This structure achieves spatial partitioning management while maintaining appropriate fluid connectivity between the compartments. The porous honeycomb structure allows liquids and dissolved substances to slowly diffuse and exchange between compartments, which helps to balance temperature, pH value, and substrate concentration, and avoid excessive local reactions or stagnation. At the same time, the partitioned layout can guide the straw material to form a gradient degradation in different areas, effectively extending the hydrolysis path and improving hydrolysis efficiency and product uniformity. In addition, this design can significantly inhibit the aggregation and floating of straw due to buoyancy, reduce the formation of short-circuit and dead zones, extend the effective residence time of materials in the chamber, and enhance the overall mixing effect; to a certain extent, it can also alleviate the problems of foam surge or concentrated gas escape, and improve the stability and controllability of the fermentation process. Overall, this structure optimizes the flow field distribution and reaction microenvironment within the hydrolysis chamber 10 without increasing additional energy consumption, providing a more stable and homogeneous fermentation broth for the subsequent acid production stage, thereby significantly improving the overall system's processing efficiency, operational reliability, and ability to adapt to complex working conditions.

[0070] Furthermore, such as Figure 6 As shown, the separator 12 includes a support sleeve 121 and six partition plates 122. The support sleeve 121 forms a guide channel, facilitating the passage of the second drive shaft 1321 of the second stirring element 132. The six partition plates 122 are evenly spaced along the circumference of the support sleeve 121 on its outer wall. Each partition plate 122 is detachably connected to the inner wall of the hydrolysis chamber 10 on its side away from the support sleeve 121. This uniformly divides the hydrolysis chamber 10 into six compartments. The partition plates 122 constitute the partitioning portion of the separator 12.

[0071] Optionally, all six partition plates 122 adopt a porous honeycomb structure and are composed of an array of regular hexagonal holes to ensure proper flow and exchange of liquids and dissolved substances between the compartments while achieving partitioning.

[0072] Optionally, the separator 12 may be made of stainless steel or PE material.

[0073] Specifically, such as Figure 1 , Figure 4 and Figure 5 As shown, the hydrolysis component 1 further includes: a second stirring assembly 13, which is disposed on the hydrolysis tank 11 and the stirring part of the second stirring assembly 13 is located inside the hydrolysis chamber 10; and a second driving assembly 14, which is disposed on the hydrolysis tank 11. The driving end of the second driving assembly 14 is drivenly connected to the second stirring assembly 13, and the second driving assembly 14 is used to drive the second stirring assembly 13 to rotate so that the stirring part of the second stirring assembly 13 stirs the material in the hydrolysis chamber 10.

[0074] With the above-described structure, by installing a second stirring component 13 and a second driving component 14 on the hydrolysis tank 11, the solid-liquid mixture of straw and other materials in the hydrolysis chamber 10 can be continuously and uniformly stirred. The stirring action effectively breaks up material agglomeration, preventing straw from floating or settling, significantly improving solid-liquid contact efficiency, and promoting full contact between hydrolytic microorganisms and the substrate, thereby accelerating the degradation of macromolecular organic matter such as cellulose and hemicellulose, and increasing hydrolysis efficiency and the generation rate and concentration of hydrolysis products. Simultaneously, uniform stirring helps maintain the consistent distribution of temperature, pH, and substrate concentration within the hydrolysis chamber 10, avoiding localized acidification or anaerobic imbalance, inhibiting the growth of miscellaneous bacteria, and ensuring stable and efficient operation of the hydrolysis process. Furthermore, this stirring system provides a more homogeneous and fluid fermentation broth for the subsequent acid production stage, improving the synergy and processing efficiency of the entire two-stage fermentation system. Overall, the installation of the second stirring component 13 and the second driving component 14 significantly enhances the reactivity, adaptability, and operational reliability of the hydrolysis component 1, laying a solid foundation for the preparation of high-quality acidified liquid required for soil improvement.

[0075] Further, the second stirring assembly 13 includes a second transmission gear 131 and a second stirring element 132. The second transmission gear 131 is rotatably disposed at the top of the hydrolysis tank 11, and the second stirring element 132 is connected to the second transmission gear 131, with at least a portion of the second stirring element 132 located within the hydrolysis chamber 10. The second stirring element 132 includes a second transmission shaft 1321 and two second stirring blades 1322. The second transmission shaft 1321 extends along the height direction of the hydrolysis tank 11, with one end connected to the second transmission gear 131 and the other end facing into the hydrolysis chamber 10, and connected to the two second stirring blades 1322. The two second stirring blades 1322 form the stirring section of the second stirring assembly 13. The second drive assembly 14 includes a second support member 141 and a second rocker arm 142. The second support member 141 is disposed at the top of the hydrolysis tank 11. The second rocker arm 142 is rotatably inserted through the first support member 261. The second rocker arm 142 has a second meshing section 1421. The second meshing section 1421 is provided with a second spiral tooth pattern adapted to the second transmission gear 131. The second meshing section 1421 is meshed with the second transmission gear 131 through the second spiral tooth pattern, so that when the second rocker arm 142 rotates, it drives the second transmission gear 131 to rotate, thereby driving the second stirring member 132 to rotate and stir the material in the hydrolysis chamber 10.

[0076] Furthermore, the end of the second drive shaft 1321 away from the second drive gear 131 passes through the connecting cylinder and is connected to the two second stirring blades 1322.

[0077] Furthermore, the second rocker arm 142 includes a second hand-held part and a second rocker arm body. One end of the second rocker arm body is connected to the second hand-held part, which is located outside the hydrolysis tank 11 for easy manual operation. The other end of the second rocker arm body is provided with a second meshing section 1421, which passes through the second support member 141 and extends toward the second transmission gear 131, so that the second meshing section 1421 and the second transmission gear 131 can mesh together.

[0078] Optionally, the second meshing section 1421 is configured as a worm gear, and the second transmission gear 131 is a matching worm wheel. Together, they form a worm gear transmission pair, thereby achieving the function of smooth transmission.

[0079] Furthermore, the second support member 141 has a second mounting hole provided along the extension direction of the second rocker body, and a second bearing is provided in the second mounting hole; the second engagement section 1421 of the second rocker body passes through the second bearing and engages with the second transmission gear 131.

[0080] Furthermore, the hydrolysis tank 11 includes a hydrolysis tank body 111 and a hydrolysis cover 112, with the hydrolysis cover 112 covering the hydrolysis tank body 111, together forming a hydrolysis chamber 10. The liquid outlet 110 is located at the bottom end of the hydrolysis tank body 111, the second transmission gear 131 is rotatably mounted on the hydrolysis cover 112, and the second drive assembly 14 is also disposed on the hydrolysis cover 112.

[0081] Furthermore, a second sealing strip 113 is provided around the periphery of the hydrolysis cover 112. When the hydrolysis cover 112 is closed on the hydrolysis tank 111, the second sealing strip 113 achieves an effective seal between the two.

[0082] Specifically, such as Figure 1 and Figure 4 As shown, the hydrolysis component 1 further includes: a second heating element 15, which is disposed on the hydrolysis tank 11 and located inside the hydrolysis chamber 10, close to the inner side of the hydrolysis chamber 10; and a second temperature sensor 16, which is disposed on the inner wall of the hydrolysis chamber 10 and spaced apart from the second heating element 15, and is used to detect the temperature inside the hydrolysis chamber 10. The second heating element 15 is selectively activated and deactivated based on the temperature detected by the second temperature sensor 16. Specifically, when the temperature detected by the second temperature sensor 16 is less than a third preset temperature threshold, the second heating element 15 is activated to heat the solid-liquid mixture inside the hydrolysis chamber 10; when the temperature detected by the second temperature sensor 16 is greater than or equal to a fourth preset temperature threshold, the second heating element 15 stops heating; the third preset temperature threshold is less than the fourth preset temperature threshold.

[0083] Optionally, the second heating element 15 may be made of materials such as stainless steel or aluminum alloy.

[0084] Specifically, such as Figure 1 and Figure 4 As shown, the hydrolysis unit 1 further includes a second solar panel 17, which is disposed on the outer wall of the hydrolysis tank 11. The second solar panel 17 is used to absorb solar radiation energy and convert it into electrical energy. The second solar panel 17 is electrically connected to the energy storage unit 3, and the converted electrical energy is transmitted to the energy storage unit 3.

[0085] Furthermore, the energy storage component 3 is also used to supply power to the power-consuming unit of the hydrolysis component 1. The power-consuming unit of the hydrolysis component 1 includes: a second heating element 15 and a second temperature sensor 16.

[0086] Furthermore, the second solar panel 17 is arc-shaped and wraps around the outer wall of the hydrolysis tank 11 to maximize the area for receiving solar radiation, improve photoelectric conversion efficiency, and at the same time take into account the compactness and aesthetics of the overall structure.

[0087] Furthermore, the hydrolysis component 1 also includes a third insulation layer 18, which wraps around the outer wall of the hydrolysis tank 11 to reduce heat loss and maintain a stable temperature inside the hydrolysis chamber 10. The second solar panel 17 is disposed outside the third insulation layer 18, that is, it is completely covered outside the third insulation layer 18, so as not to affect the insulation performance and to fully receive solar radiation.

[0088] Alternatively, the second solar panel 17 may cover only a portion of the outer wall of the hydrolysis tank 11.

[0089] Optionally, the third insulation layer 18 is made of polyurethane foam material; given the high temperature required to be maintained in the hydrolysis tank 11, the surface of the insulation layer is preferably dark, such as black.

[0090] Furthermore, the hydrolysis component 1 also includes a fourth insulation layer 19, which covers the outer surface of the hydrolysis cover 112 to reduce heat loss from the top and improve the overall insulation effect.

[0091] Alternatively, the fourth insulation layer 19 may be made of materials such as polyurethane foam. Given the high temperature required to be maintained in the hydrolysis tank 11, the surface of the insulation layer is preferably dark, such as black.

[0092] Optionally, the fermentation device operates as follows: 1. Loading and Start-up Hydrolysis Stage Open the hydrolysis cover 112 and fill the pre-treated (approximately 1 cm in length) short sections of straw into the mesh bag. The straw has been inoculated with fermentation bacteria during bagging. Place the mesh bags containing the straw evenly into the six compartments of the hydrolysis chamber 10, and add water until the straw is completely submerged.

[0093] Cover the hydrolysis chamber 10 with the hydrolysis cap 112 and press the second sealing strip 113 to ensure the hydrolysis chamber 10 is sealed.

[0094] 2. Fermentation and Temperature Control Under sunlight, the hydrolysis tank 11 gradually heats up. In summer conditions, the temperature can rise to approximately 55°C within a day and then be maintained within that range. The target temperature range within the hydrolysis chamber 10 is 50°C to 55°C. When the second temperature sensor 16 detects a temperature below 50°C, the second heating element 15 automatically activates; when the temperature reaches or exceeds 55°C, the second heating element 15 stops operating. The third insulation layer 18 helps maintain a stable temperature inside the tank, and the fermentation process itself also generates heat, further ensuring a constant temperature.

[0095] During fermentation, the second stirring component 13 is gently stirred for 3 minutes each morning and evening by rotating the second rocker arm 142 to promote material mixing and uniform reaction. The fermentation cycle is generally one week, during which time the straw is gradually hydrolyzed.

[0096] 3. Acid production stage After hydrolysis, the fermentation broth flows into the acid-producing chamber 20 of the acid-producing tank 21 through the outlet 110 and the inlet 210, initiating the acid-producing reaction. During the acid-producing process, the temperature of the fermentation broth needs to be maintained between 30°C and 35°C. When the first temperature sensor 28 detects that the temperature inside the acid-producing chamber 20 is below 30°C, the first heating element 27 is activated and begins heating; when the temperature reaches or exceeds 35°C, the first heating element 27 stops heating.

[0097] Meanwhile, during the acid production process, the dissolved oxygen concentration needs to be maintained within a suitable range. When the dissolved oxygen detector 24 detects that the dissolved oxygen concentration of the fermentation broth in the acid production chamber 20 is lower than 0.05 mg / L, the aeration plate 23 is activated and gas is introduced into the acid production chamber 20; when the dissolved oxygen concentration reaches or exceeds 0.15 mg / L, the aeration plate 23 stops working, thereby stabilizing the dissolved oxygen concentration within the micro-oxygen range of 0.05 to 0.15 mg / L.

[0098] Every morning and evening, the liquid is gently stirred for 3 minutes by rotating the first rocker arm 262 to drive the first agitator 252, promoting liquid mixing and improving mass transfer efficiency. The acid production process usually lasts for 3 to 4 days, and the final acid solution has a pH value of around 3.5. This acid solution is suitable for improving soda-type soils with excessive alkalinity.

[0099] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0100] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments, and will not be repeated here.

[0101] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0102] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0103] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A fermentation device for soil remediation, characterized in that, include: Hydrolysis component (1), wherein the hydrolysis component (1) is provided with a hydrolysis chamber (10), wherein the hydrolysis chamber (10) is used to contain water and pretreated straw, so that the straw undergoes a fermentation reaction in the hydrolysis chamber (10); An acid-producing component (2) is disposed below the hydrolysis component (1). The acid-producing component (2) is provided with an acid-producing chamber (20), which is connected to the hydrolysis chamber (10) and forms a sealed space with the hydrolysis chamber (10). The acid-producing chamber (20) is used to receive the fermentation broth flowing out of the hydrolysis chamber (10) so that the fermentation broth undergoes an acid-producing reaction in the acid-producing chamber (20) under the action of acid-producing microorganisms. The acid-producing component (2) is provided with a drain port that communicates with the acid-producing chamber (20), and the drain port is used to discharge the liquid after the acid-producing reaction is completed.

2. The fermentation device for soil remediation according to claim 1, characterized in that, The acid-producing component (2) includes: An acid-producing tank (21) is provided with an acid-producing chamber (20) inside the acid-producing tank (21), and an inlet (210) is provided at the top of the acid-producing tank (21) for communicating with the hydrolysis chamber (10). Biological carrier (22) is disposed in the acid-producing cavity (20) and there is a gap between the biological carrier (22) and the bottom wall of the acid-producing cavity (20); the biological carrier (22) has a porous structure and the acid-producing microorganisms are attached to the biological carrier (22).

3. The fermentation device for soil remediation according to claim 2, characterized in that, The acid-producing component (2) also includes: An aeration plate (23) is provided at the bottom of the acid-producing tank (21), and at least a portion of the aeration plate (23) is located inside the acid-producing chamber (20). The aeration plate (23) is used to introduce gas into the acid-producing chamber (20). A dissolved oxygen detector (24) is disposed on the inner wall of the acid-producing chamber (20) and is used to detect the dissolved oxygen concentration in the acid-producing chamber (20); the aeration plate (23) is selectively started and stopped according to the dissolved oxygen concentration detected by the dissolved oxygen detector (24); When the dissolved oxygen concentration detected by the dissolved oxygen detector (24) is less than the first preset concentration threshold, the aeration plate (23) is activated and gas is introduced into the acid production chamber (20); when the dissolved oxygen concentration detected by the dissolved oxygen detector (24) is greater than or equal to the second preset concentration threshold, the aeration plate (23) stops operating; the first preset concentration threshold is less than the second preset concentration threshold.

4. The fermentation device for soil remediation according to claim 2, characterized in that, The acid-producing component (2) also includes: The first stirring component (25) is disposed on the acid production tank (21), and the stirring part of the first stirring component (25) is located in the acid production chamber (20). The stirring part of the first stirring component (25) and the biological carrier (22) are spaced apart along the height direction. The first driving component (26) is disposed on the acid production tank (21); the driving end of the first driving component (26) is driven to be connected to the first stirring component (25); the first driving component (26) is used to drive the first stirring component (25) to move so that the stirring part of the first stirring component (25) stirs the liquid in the acid production chamber (20).

5. The fermentation device for soil remediation according to claim 4, characterized in that, The first stirring assembly (25) includes: a first transmission gear (251) and a first stirring element (252). The first transmission gear (251) is rotatably disposed at the top of the acid production tank (21), and the first transmission gear (251) is spaced apart from the liquid inlet (210). At least a portion of the first stirring element (252) is disposed in the acid production chamber (20). The first stirring element (252) has a first connecting portion and a first stirring portion connected in sequence. The end of the first connecting portion away from the first stirring portion is connected to the first transmission gear (251). The first stirring portion forms the stirring portion of the first stirring assembly (25). The first drive assembly (26) includes a first support member (261) and a first rocker arm (262). The first support member (261) is disposed at the top of the acid production tank (21). The first rocker arm (262) is rotatably disposed through the first support member (261). The first rocker arm (262) has a first engagement section (2621). The first engagement section (2621) is provided with a first spiral tooth pattern adapted to the first transmission gear (251). The first engagement section (2621) engages with the first transmission gear (251) through the first spiral tooth pattern to drive the first transmission gear (251) to rotate when the first rocker arm (262) rotates.

6. The fermentation apparatus for soil remediation according to claim 2, characterized in that, The acid-producing component (2) also includes: A first heating element (27) is disposed on the acid-producing tank (21) and is used to heat the liquid in the acid-producing chamber (20). A first temperature sensor (28) is disposed on the inner wall of the acid-producing chamber (20) for detecting the temperature inside the acid-producing chamber (20); the first heating element (27) is selectively started and stopped according to the temperature detected by the first temperature sensor (28). When the temperature detected by the first temperature sensor (28) is less than the first preset temperature threshold, the first heating element (27) is activated and heats the liquid in the acid-producing chamber (20); when the temperature detected by the first temperature sensor (28) is greater than or equal to the second preset temperature threshold, the first heating element (27) stops heating; the first preset temperature threshold is less than the second preset temperature threshold.

7. The fermentation apparatus for soil remediation according to claim 2, characterized in that, The acid-producing component (2) further includes: a first solar panel (29), which is disposed on the outer wall of the acid-producing tank (21). The first solar panel (29) is used to absorb solar radiation energy and convert the solar radiation energy into electrical energy. The fermentation device further includes an energy storage component (3), which is located at the top of the acid-producing tank (21). The energy storage component (3) is electrically connected to the first solar panel (29) and the power-consuming unit of the acid-producing component (2), respectively. The energy storage component (3) is used to store the electrical energy converted by the first solar panel (29) and to supply power to the power-consuming unit of the acid-producing component (2).

8. The fermentation apparatus for soil remediation according to claim 2, characterized in that, The hydrolysis component (1) includes: a hydrolysis tank (11), which is disposed above the acid-producing tank (21), and there is a gap between the hydrolysis tank (11) and the acid-producing tank (21); the hydrolysis tank (11) is provided with the hydrolysis chamber (10); the bottom end of the hydrolysis tank (11) is provided with an outlet (110) that communicates with the hydrolysis chamber (10), and the outlet (110) is connected to the inlet (210) through a connecting pipe (8); The fermentation apparatus further includes: a plurality of first support columns (4), the plurality of first support columns (4) being spaced apart at the bottom end of the hydrolysis tank (11), the hydrolysis tank (11) being mounted above the acid production tank (21) via each of the first support columns (4).

9. The fermentation apparatus for soil remediation according to claim 8, characterized in that, The hydrolysis component (1) further includes: a partition (12), which is disposed in the hydrolysis chamber (10) and located at the top of the hydrolysis chamber (10). The partition (12) is used to divide the hydrolysis chamber (10) into at least two compartments along the circumferential direction of the hydrolysis tank (11). The partition portion of the partition (12) has a porous honeycomb structure.

10. The fermentation apparatus for soil remediation according to claim 8, characterized in that, The hydrolysis component (1) further includes: The second stirring assembly (13) is disposed on the hydrolysis tank (11), and the stirring part of the second stirring assembly (13) is located inside the hydrolysis chamber (10); The second drive assembly (14) is disposed on the hydrolysis tank (11); the drive end of the second drive assembly (14) is driven to be connected to the second stirring assembly (13); the second drive assembly (14) is used to drive the second stirring assembly (13) to rotate so that the stirring part of the second stirring assembly (13) stirs the material in the hydrolysis chamber (10).

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