External sewage treatment equipment for soil improvement

Abstract

The invention relates to external sewage treatment equipment for soil improvement, which mainly comprises a physical treatment tank and a plurality of inclined plates obliquely arranged in the physical treatment tank, and a biological treatment unit comprises an aerobic tank and an anaerobic tank which are connected with each other and are internally provided with an aerobic bacteria biological membrane and an anaerobic bacteria biological membrane respectively; the side wall of the physical treatment tank is connected with the inlet end of a three-way valve at the bottom of the aerobic tank through a first drainage pipeline, the three-way valve is connected with the anaerobic tank, a sliding cup is mounted at the bottom in the aerobic tank in a sliding and sealing manner, and a plurality of aerobic biological membrane plates which are sequentially hinged with one another are stacked in the sliding cup; sewage can flow into the anaerobic jar, the anaerobic jar is directly communicated with the bottom of an improvement pool, the improvement pool is provided with a plurality of agent tanks, the agent tanks are used for injecting a modifier in a corresponding proportion into the improvement pool to be mixed with water, and the improvement pool is further connected with a drip irrigation system arranged on the land. According to the invention, on-site sewage treatment can be realized, and a modifier is added into the treated water to improve the land on site.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment and soil remediation technology, specifically relating to an external treatment device that combines the dual functions of wastewater treatment and soil improvement. In particular, it relates to an external wastewater treatment device for targeted soil improvement in scenarios such as farmland non-point source pollution control, saline-alkali / barren land improvement, and decentralized rural wastewater treatment. Background Technology

[0002] Soil degradation and water pollution have become core issues restricting the sustainable development of agriculture and the improvement of the ecological environment. On the one hand, my country has a large amount of barren soil that is saline, acidified, and lacks organic matter. Traditional soil improvement methods often use single-agent application and physical tillage, which have drawbacks such as long improvement cycles, unstable effects, and easy secondary pollution. On the other hand, decentralized sewage such as farmland tailwater, rural domestic sewage, and aquaculture wastewater will exacerbate eutrophication of water bodies if discharged directly, while losing a large amount of nutrients such as nitrogen, phosphorus, and potassium, resulting in resource waste. Specifically, existing wastewater treatment equipment and soil improvement devices are mostly independent of each other. Conventional wastewater treatment devices only achieve wastewater discharge that meets standards, and cannot recover and utilize the treated water and nutrients for soil improvement, resulting in low resource utilization. At the same time, soil improvement equipment lacks supporting water treatment systems, making it difficult to simultaneously address soil pollution and surrounding water pollution issues, leading to low treatment efficiency. Traditional wastewater treatment equipment is mostly buried or partially buried, and some common treatment units are directly excavated and built on-site, which is difficult to disassemble, maintain, and repair, and has high maintenance costs. It is difficult to flexibly adapt to decentralized soil improvement scenarios such as farmland, woodland, and areas near livestock farms, and cannot achieve simultaneous integration of on-site wastewater treatment and soil improvement. Therefore, developing an external device that combines deep wastewater purification with precise soil improvement to achieve both pollution control and soil improvement, and to enhance synergistic effects, has become a major technical challenge that urgently needs to be addressed in this field.

[0003] Furthermore, traditional wastewater treatment generally includes physical separation and filtration, as well as biological decomposition. Conventional physical sedimentation devices often use simple filter media structures that allow suspended solids to settle naturally and centrally at the bottom, resulting in low efficiency in sedimentation and separation of suspended solids. This further restricts subsequent biological treatment processes. In the biological treatment stage, the biofilm in traditional aerobic tanks is often fixed and laid flat or suspended, which can easily lead to situations where the wastewater cannot completely cover the biofilm. This limited contact between wastewater and the biofilm results in insufficient degradation of organic matter, inadequate nitrogen and phosphorus removal efficiency, and insufficient utilization of the microbial community.

[0004] In the soil improvement process, manual application of chemicals is commonly used. This method suffers from poor chemical mixing accuracy and low automation, making it impossible to achieve precise quantitative mixing based on wastewater treatment volume. Furthermore, the concentration of the improvement solution is difficult to adapt to the improvement needs of different soil types, resulting in poor synergy between wastewater treatment and soil improvement. Consequently, it fails to completely solve wastewater pollution problems and is also ineffective in improving soil compaction, pH imbalance, and organic matter deficiency. Although high-precision automated chemical mixing equipment exists, its high purchase cost and difficulty for general users to maintain effectively limit its widespread application. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide an external sewage treatment device for soil improvement, so as to solve the problem that the prior art cannot better combine non-point source sewage treatment with soil improvement.

[0006] This invention is achieved through the following technical solution: An external wastewater treatment device for soil improvement includes a physical treatment unit and a biological treatment unit. The physical treatment unit includes a physical treatment tank and several inclined plates arranged at an angle inside the physical treatment tank. Wastewater is pumped into the physical treatment tank from its top via a wastewater pump. The biological treatment unit includes an aerobic tank and an anaerobic tank, which are connected to each other and respectively contain aerobic and anaerobic bacterial biofilms inside. The side wall of the physical treatment tank is connected to the inlet end of a three-way valve at the bottom of the aerobic tank via a first drainage pipe. One outlet end of the three-way valve is connected to the anaerobic tank. The bottom of the aerobic tank has a coaxial sliding plate. A sliding cup is installed in a dynamically sealed manner. Several aerobic biofilm plates are stacked and hinged sequentially inside the bottom port of the sliding cup, so that sewage enters the bottom port of the sliding cup from the three-way valve and lifts the sliding cup to its limit position, so that the aerobic biofilm plates are arranged in a serpentine manner in the aerobic tank, spaced apart along its axial direction. When the outlet end of the three-way valve is opened, sewage flows into the anaerobic tank. The anaerobic tank is directly connected to the bottom of an improvement tank. Several chemical tanks are provided on the improvement tank. The chemical tanks are used to inject the corresponding proportion of improvement agent into the improvement tank to mix with the water. The improvement tank is also connected to a drip irrigation system deployed on the land.

[0007] Furthermore, one end of the inclined plate is located obliquely downward inside the physical treatment tank, and the other end is located inside the extension plate on the side wall of the physical treatment tank. The bottom of the extension plate near the physical treatment tank has a convex cavity with a water leakage hole at the bottom. A transmission gear is rotatably installed inside the convex cavity. The bottom of the inclined plate is provided with a rack that meshes with the transmission gear to drive the inclined plate to slide into / out of the physical treatment tank.

[0008] Furthermore, the physical treatment tank has a partition in the center that divides it into two parts, with corresponding inclined plates on both sides of the partition.

[0009] Furthermore, each inclined plate has a horizontally arranged first drainage pipe located below it; the bottom of the partition is located at the center of the top port of the drain valve at the center of the bottom of the physical treatment tank.

[0010] Furthermore, the front and rear sides of the two extension plates, which are opposite to each other and open to the left, are each connected by a barrier, so that the two extension plates, the two barriers, and the physical treatment tank together form a rectangular annular water storage tank. The side wall of each annular water storage tank is connected to a second drainage pipe, which is also connected to the inlet end of the three-way valve.

[0011] Furthermore, the upper surface of each extension plate is provided with several toothed ridges, the cross-section of which is triangular.

[0012] Furthermore, the top port of the physical treatment tank is connected to the sewage pump, and a stainless steel grating is provided below the top port; several filter plates are provided below the stainless steel grating.

[0013] Furthermore, the aerobic biofilm plate is circular, with the sides of two adjacent aerobic biofilm plates hinged to each other. The side of the bottom aerobic biofilm plate is hinged to one side of the bottom surface of the physical treatment tank, and the side of the top aerobic biofilm plate is hinged to one side of the inner top surface of the sliding cup. It also includes an aeration pipe coaxially suspended and fixed in the aerobic tank. The bottom end of the aeration pipe is closed, and the side wall has several aeration holes. All aerobic biofilm plates have a strip-shaped hole in the center for the aeration pipe to pass through. When all aerobic biofilm plates are stretched to their limit, the aeration pipe does not interfere with the movement of the aerobic biofilm plates.

[0014] Furthermore, one end of the anaerobic tank is connected to the third drainage pipe, and the other end of the third drainage pipe is vertically inserted into the bottom of the improvement tank. A float plate is vertically and slidably sealed inside the improvement tank. All the reagent tanks are fixed to the top of the improvement tank. A piston rod is vertically and slidably installed inside the reagent tank. The piston plate at the top of the piston rod is used to push the improvement agent in the reagent tank above it to output into a drug delivery pipe. The bottom end of the piston rod is used to contact the top surface of the float plate. The top end of the reagent pipe is connected to the bottom of the improvement tank through the drug delivery pipe. The float plate, the third drainage pipe, and the reagent pipe are all vertically and slidably sealed together, so that during the water injection process in the improvement tank, the float plate moves up and pushes the piston rod to move a corresponding displacement, and the reagent tank injects the corresponding proportion of agent into the improvement tank through the drug delivery pipe.

[0015] Furthermore, a sliding plug is vertically and slidably sealed above the piston plate inside the medicine container, and the internal space of the medicine container above the sliding plug is filled with the improved medicine; a threaded tube is vertically fixed at the bottom inside the medicine container, and a screw is threadedly inserted into the threaded tube and elastically contacts it through a pre-tightening spring. The length of the extended screw is used to adjust the output of the medicine. When the piston plate moves up, it can contact the sliding plug and push the sliding plug to move up.

[0016] The beneficial effects of this invention are as follows: This external wastewater treatment equipment for soil improvement adopts an external ground-mounted layout structure, allowing each tank and pipeline to be directly installed on the ground. It is suitable for various decentralized soil improvement scenarios such as farmland and woodland, eliminating the need for underground construction and significantly reducing the difficulty of disassembly, relocation, and maintenance, thus breaking through the scenario limitations of traditional fixed equipment. After microorganisms decompose the organic matter in the wastewater, nitrogen, phosphorus, and potassium nutrients do not disappear but undergo a transformation, with most remaining in the purified water and being dispersed and added to the soil to be improved along with the soil conditioner, avoiding resource waste. Specifically, the present invention also includes the following effects: The vertical physical treatment tank has an internal inclined plate and two equally divided settling chambers. It uses the principle of shallow sedimentation to shorten the particle settling distance and increase the settling area, so as to realize the diversion and graded treatment of sewage and improve the settling rate of suspended solids. In addition, the extension plate and the annular water storage tank structure can not only temporarily store the supernatant of the initial filtration and relieve the water flow pressure, but also realize the circulation filtration, improve the equipment's processing capacity, and perfectly adapt to the needs of large-flow sewage treatment. The aerobic and anaerobic tanks are arranged in series to form a staged biological treatment system. The sliding cup telescopic structure inside the aerobic tank is combined with the hinged serpentine biofilm plate. When water is injected, the water pressure automatically raises the sliding cup, causing the biofilm plate to fully stretch and unfold, evenly covering the inner cavity of the tank. This greatly improves the matching degree between sewage, aerobic bacteria biofilm, and aeration, ensuring that the biofilm is fully submerged during each treatment. Depending on the type of sewage, under the premise of a certain sewage volume and bacterial community, the aerobic decomposition capacity can be controlled by changing the aeration rate. Furthermore, a significant advantage of this invention is the automatic and precise dispensing of soil conditioner agents within the improvement tank in a remarkably simple and effective manner. This results in highly targeted soil improvement, and the simple structural principle allows users to perform self-inspection and maintenance. The improvement tank employs a unique structure linking a float plate to the agent tank for dispensing. The float plate rises and falls with the water level, synchronously pushing the piston rod. Through a piston plate, sliding plug, pre-tension spring, and screw adjustment mechanism, the automatic ratio of agent dispensing to wastewater treatment volume is achieved, eliminating the need for manual adjustment and ensuring precise control of the improved solution concentration. By adjusting the screw extension length, the proportions of different soil conditioner agents (organic matter conditioner, soil loosening agent, pH adjuster) can be flexibly adjusted, perfectly adapting to the improvement needs of different soils and enhancing the targeted nature of soil remediation. The improved solution is evenly infiltrated into the soil through a drip irrigation system, achieving seamless integration of wastewater treatment and soil improvement, completing wastewater purification and soil optimization on-site. Overall, the external wastewater treatment equipment for soil improvement in this invention can achieve decentralized on-site wastewater treatment and convert purified water into soil improvement liquid, realizing water resource recycling. It has both environmental and economic benefits and is suitable for large-scale promotion and application.

[0017] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0018] Figure 1 This is a simplified structural diagram of the physical treatment unit of an external wastewater treatment device for soil improvement according to the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 for Figure 1 BB section view; Figure 4 This is a schematic diagram of the internal structure of an anaerobic digester; Figure 5 This is a cross-sectional view of the internal structure of the anaerobic digester; Figure 6 for Figure 5 Enlarged view of point C in the middle; Figure 7 A schematic diagram of a serpentine arrangement formed during the stretching and separation of all aerobic biofilm plates; Figure 8 Top view of all aerobic biofilm plates stacked inside a sliding cup; Figure 9 This is a schematic diagram of the improved pond structure; Figure 10 This is a schematic diagram of the structure of a medicine container.

[0019] In the diagram: 1. Physical treatment tank, 101. Cavity, 10101. Drainage hole, 2. Stainless steel grating, 3. Filter plate, 4. First drainage pipe, 5. Extension plate, 6. Inclined plate, 7. Transmission gear, 8. Tooth ridge, 9. Enclosure, 10. Sewage pump, 11. Baffle plate, 12. Sewage valve, 13. Aerobic tank, 14. Sliding cup, 15. Sealing ring, 16. Aerobic biofilm plate, 16. Strip hole, 1601. Hinge shaft, 1602. Aeration pipe, 17. Three-way valve, 18. Improvement tank, 19. Third drainage pipe, 20. Float, 21. Chemical tank, 22. Drug delivery pipe, 23. Piston rod, 24. Piston plate, 2401. Sliding plug, 25. Screw, 26. Threaded pipe, 27. Drip irrigation system, 28. Detailed Implementation

[0020] 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, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] This invention provides a technical solution: This embodiment discloses an external wastewater treatment device for soil improvement, which is adaptable to soil improvement scenarios such as farmland and woodland. The device is installed on the ground, and its external layout facilitates disassembly and maintenance. The core components mainly include two modules: a physical treatment unit and a biological treatment unit. For details, please refer to... Figure 1 The physical treatment unit uses a vertical physical treatment tank 1, which can be installed on an adaptively designed main frame instead of a traditional on-site excavated sedimentation tank. Several equally spaced inclined plates 6 are arranged inside the physical treatment tank 1, forming a 60° angle with the bottom surface of the tank to improve the settling efficiency of suspended solids. A sewage pump 10 is connected to the top of the physical treatment tank 1 via a flange. The inlet of the sewage pump 10 is connected to agricultural tailwater, domestic sewage, or other wastewater sources awaiting treatment. After startup, the sewage is pressurized and injected into the physical treatment tank 1 for physical separation and filtration. The biological treatment unit consists of an aerobic tank 13 and an anaerobic tank connected in series. The inner wall of the aerobic tank 13 is covered with an aerobic bacterial biofilm, and the inner wall of the anaerobic tank is covered with an anaerobic bacterial biofilm. The two tanks are connected by pipes to achieve step-by-step biological treatment. More specifically, a drain outlet is opened on the side wall of the physical treatment tank 1, connecting to a first drain pipe 4. The end of the first drain pipe 4 connects to the inlet of a three-way valve 18 at the bottom of the aerobic tank 13, allowing the physically treated water to enter the aerobic tank 13. In specific manufacturing, the three-way valve 18 can be equipped with two outlet ends. One outlet is directly connected to the inlet of the anaerobic tank, and the other can be installed directly at the bottom of the anaerobic tank to feed water into it. Therefore, relative to the water supply from the physical treatment tank 1 to the anaerobic tank, it also serves as an inlet. As part of the design structure, such as Figures 4-6A sliding cup 14 is coaxially mounted at the bottom of the aerobic tank 13. The sliding cup 14 is roughly an inverted cup-shaped structure with its opening facing downwards. The sliding cup 14 and the inner wall of the anaerobic tank are axially slidingly sealed using a sealing ring 15. Several sequentially hinged aerobic biofilm plates 16 are stacked inside the bottom port of the sliding cup 14. In the initial state, such as... Figures 5-6 The biofilm plate is folded and stored inside the sliding cup 14. During use, the wastewater to be treated enters the bottom port of the sliding cup 14 through the three-way valve 18. After entering the cup opening, the water pressure continuously lifts the sliding cup 14 until it reaches a preset limit position within the tank. This limit position can be intentionally set, for example, by installing a limit block near the top of the anaerobic tank to control the upward movement of the sliding cup 14. Alternatively, as one implementation, a touch switch can be installed at the limit block so that after a set time T, the three-way valve 18 automatically switches to a path where water can only flow from the aerobic tank 13 to the anaerobic tank. When the sliding cup 14 reaches its limit position, the aerobic tank 13 is filled with a set amount of water. At this point, the hinged aerobic biofilm plate 16 is fully stretched. Figure 7 The wastewater is arranged in a serpentine pattern within the axial section of the aerobic tank 13 to ensure sufficient contact and reaction between the wastewater and the aerobic bacteria biofilm, thereby enhancing the aerobic degradation effect. After time T, the three-way valve 18 can be automatically or manually switched to connect the aerobic tank 13 and the anaerobic tank. Wastewater treated by aerobic bacteria flows into the anaerobic tank for anaerobic fermentation, nitrogen and phosphorus removal, etc. The outlet of the anaerobic tank is directly connected to the bottom inlet of the soil improvement tank 19. Several sets of reagent tanks 22 are evenly arranged on the top of the improvement tank 19. For example, if there are three sets, each set of reagent tanks 22 stores organic matter improver, soil loosening agent and pH regulator respectively. The improver is added into the improvement tank 19 according to the preset ratio and fully mixed with the treated wastewater to form the improvement liquid. The outlet of the improvement tank 19 is connected to the drip irrigation system 28 set on the surface of the soil to be improved. Usually, it can be connected to the main inlet section of the drip irrigation network on site. The improvement liquid is evenly penetrated into the soil through the drip irrigation system 28, realizing wastewater treatment and soil improvement at the same time, and carrying out wastewater purification and soil property improvement on site.

[0024] In this embodiment, as Figure 1 As shown, one end of each inclined plate 6 extends obliquely downwards into the interior of the physical treatment tank 1 to collect settled suspended solids and improve the sedimentation and separation effect. The other end of the inclined plate 6 extends into the inner cavity of the integrally formed extension plate 5 on the side wall of the physical treatment tank 1. The extension plate 5 also protrudes outwards from the tank body of the physical treatment tank 1 in an adaptively inclined manner. See also... Figure 1 , Figure 2A cavity 101 is also provided at the bottom of the extension plate 5 near the physical treatment tank 1. Multiple drainage holes 10101 are evenly arranged at the bottom of this cavity 101 to drain small amounts of sewage or other impurities carried out by the inclined plate 6, while also facilitating observation and maintenance. A transmission gear 7 is rotatably mounted inside the cavity 101. The transmission gear 7 is externally connected to a manual crank or a micro-drive motor to achieve manual or automatic control. A straight rack is integrally formed at the bottom of the inclined plate 6, and the rack precisely meshes with the transmission gear 7 to form a gear and rack transmission mechanism. In operation, when the transmission gear 7 is rotated forward, the rack drives the inclined plate 6 to slide smoothly out of the physical treatment tank 1, facilitating the scraping off of sediment on the inclined plate 6, i.e., silt, impurities, etc., attached to the upper surface of the inclined plate 6, which then scatters at the bottom of the physical treatment tank 1 for centralized cleaning. When the gear is rotated in the reverse direction, the inclined plate 6 slides smoothly back into the physical treatment tank 1, returning to its settling position.

[0025] In actual manufacturing, each tank and its corresponding pipeline can be detachably installed together through the main frame (not shown in the figure) and integrated into one unit. A series of casters are installed at the bottom of the main frame or the bottom of the tank to move the wastewater treatment equipment to the vicinity of the soil that needs to be improved, taking into account the location of the wastewater source and the land to be improved, and organically combining the two as needed.

[0026] In this embodiment, as Figure 1 As shown, a stainless steel partition 11 is vertically welded to the center of the physical treatment tank 1 to equally divide the internal space of the tank into two settling chambers, left and right, achieving wastewater diversion and settling and improving treatment efficiency. Several inclined plates 6 are arranged correspondingly in the chambers on both sides of the partition 11, with the left and right inclined plates 6 arranged in an alternating and staggered manner. In practice, the left inclined plate 6 can be chosen to be relatively higher than the right inclined plate 6 to enhance the settling and separation effect of suspended solids and silt, while also balancing the internal forces of the tank and extending the service life of the equipment.

[0027] In this embodiment, as Figure 1 As shown, a first drainage pipe 4 is horizontally arranged on both sides of the partition 11 inside the physical treatment tank 1, below each inclined plate 6. When the actual sedimentation and separation of the treated wastewater allows, that is, when most of the suspended debris near the upper part of the inclined plate 6 has settled on the upper surface of the corresponding inclined plate 6, and therefore there is relatively little suspended debris to be settled near the lower surface, the clear liquid layer after sedimentation treatment by the corresponding inclined plate 6 flows into the corresponding drainage pipe. If the distribution of suspended debris in the actual treated wastewater is difficult to fully utilize the inclined plates 6 for step-by-step sedimentation, then when inputting wastewater into the aerobic tank 13, it is necessary to select whether to input wastewater through the corresponding first drainage pipe 4. In the above embodiments, as Figure 3The bottom of the baffle 11 is centrally located, directly opposite the top port of the drain valve 12 at the bottom center of the physical treatment tank 1. The drain valve 12 can be an electric butterfly valve, normally closed to maintain the tank's airtightness. When opened periodically or after inspection, the sludge and impurities settled on both sides of the baffle 11 can quickly converge to the drain valve 12 along the baffle 11 guide, and be completely discharged from the tank, preventing sludge accumulation and blockage at the bottom of the tank, and ensuring the continuous and stable operation of the physical treatment unit. When there are many inclined plates 6, i.e., many transmission gears 7, the end of the gear shaft of the transmission gear 7 can be coaxially fixed to a sprocket. The sprocket is located on the outside of the corresponding tank body, for example, on the outside of the annular water storage tank mentioned below, so as to drive through the chain. This can achieve the effect of a single motor driving multiple inclined plates 6 to slide synchronously, avoiding the need for too many motors and affecting practicality.

[0028] As an alternative auxiliary structural design, such as Figure 3 In this embodiment, an annular water storage tank structure is added. Two extension plates 5 are symmetrically arranged on the left and right sides of the physical treatment tank 1. The front and rear end faces of the two extension plates 5 are welded together by sealing barriers 9. The barriers 9 are made of stainless steel plates and are tightly fitted and sealed with the extension plates 5 and the outer wall of the physical treatment tank 1, forming a ring-shaped structure. Figure 3 The rectangular, sealed annular water storage tank shown is used to receive water discharged from the first drainage pipe 4. As a pretreatment buffer tank, the annular water storage tank temporarily stores the clean water initially filtered by the inclined plate 6, alleviating the water flow pressure on the subsequent biological treatment unit. Furthermore, as mentioned earlier, if the actual wastewater treatment conditions permit, it can be directly fed into the aerobic tank 13 through the annular water storage tank. In specific manufacturing, the bottom of the side wall of each annular water storage tank is connected to a second drainage pipe, which is connected to the inlet end of a three-way valve 18. This allows the supernatant directly discharged from the physical treatment tank 1 and the buffered clean water from the annular water storage tank to flow together into the biological treatment unit, increasing the equipment's processing capacity and adapting to high-flow wastewater treatment needs. When the annular water storage tank acts as a buffer tank, the second drainage pipe can also be connected to the physical treatment tank 1 via a circulation pipe (not shown in the figure) for one or more cycles of filtration.

[0029] In this embodiment, as Figure 2 As shown, several toothed ridges 8 with isosceles triangular cross-sections are evenly formed on the upper surface of each extension plate 5 along the sliding direction of the inclined plate 6. The toothed ridges 8 are integrally formed with the extension plate 5. The toothed ridges 8 can intercept some particulate waste when receiving sewage directly discharged from the first drainage pipe 4, and gradually settle some particulate sludge, avoiding all sediment from accumulating at the bottom of the above-mentioned annular water storage tank, which would make it easier to block the corresponding drainage pipe.

[0030] like Figure 1As shown, the top opening of the physical treatment tank 1 in this embodiment is the water inlet port, which is directly and sealed to the outlet flange of the sewage pump 10. A stainless steel bar 2 can be detachably installed below the water inlet port to intercept large particulate impurities such as straw, stones, and plastic film in the sewage (the specific type depends on the actual type of sewage being treated). Multiple porous filter plates 3 are arranged in parallel below the stainless steel bar 2, which can be stacked to further filter fine suspended particles in the sewage, gradually reducing the turbidity of the sewage, reducing the load on the subsequent biological treatment unit, extending the service life of the aerobic and anaerobic bacteria biofilm, and improving the overall treatment effect.

[0031] In this embodiment, the aerobic biofilm plate 16 adopts a circular structure design, such as a circular porous plate, with a high-density aerobic bacterial biofilm attached to the surface of the plate; the sides of two adjacent aerobic biofilm plates 16 are connected by, for example, Figure 8 The hinge shaft 1602 shown is hinged, and each hinge point is set to move back and forth sequentially to ensure that it will be as shown after stretching. Figure 7 The serpentine arrangement shown has the bottom biofilm plate hinged to the right side of the inner bottom surface of the aerobic tank 13, and the top biofilm plate hinged to the left side of the inner top surface of the sliding cup 14, forming a continuous hinged and unfolded structure. Aeration pipes 17 are coaxially suspended and fixed inside the aerobic tank 13. Aeration pipes 17 are made of stainless steel, with a sealed bottom end and evenly spaced aeration holes on the side walls. An external aeration fan is connected. The aeration pipes 17 are selected according to actual conditions, requiring that the purchased aeration pipes 17 can provide normal aeration at the set water depth. Figure 6 , Figure 8 As shown, all aerobic biofilm plates 16 have elongated through holes in the center, i.e., strip-shaped holes 1601. The width of the strip-shaped holes 1601 is preferably slightly larger than the outer diameter of the aeration pipe 17. The aeration pipe 17 passes through the center of all biofilm plates, and during the entire process of folding and stretching the biofilm plates to their limit positions, the aeration pipe 17 does not touch or interfere with the biofilm plates, ensuring uniform aeration, smooth movement of the biofilm plates, and continuous supply of sufficient oxygen to aerobic bacteria, thereby improving the degradation efficiency of organic matter.

[0032] In the design of the aerobic tank 13 above, the water injection volume is automatically matched with the decomposition capacity of aerobic bacteria and the aeration rate. When the water injection volume reaches the set limit, the aerobic biofilm plate 16 is also evenly distributed in the water storage area of ​​the entire tank, and the aeration pipe 17 is also evenly aerated in the depth direction, so as to realize that the aerobic bacteria can fully and efficiently decompose and treat the sewage entering the aerobic tank 13.

[0033] In this embodiment, to further optimize the implementation structure of the automatic reagent proportioning in the improved tank 19, such as... Figure 9As shown, an L-shaped third drainage pipe 20 can be connected to the outlet of the anaerobic tank. The bottom end of the third drainage pipe 20 is vertically inserted into the improvement tank 19, extending to a point such as 10cm above the bottom of the tank, ensuring that the treated wastewater enters evenly from the bottom of the improvement tank 19, so that a float 21 rises as the amount of wastewater input increases. In this embodiment, the float 21 is set inside the improvement tank 19, and the float 21, the inner wall of the tank, and the third drainage pipe 20 are all sealed with rubber sealing rings 15 to achieve sliding seals. It floats up and down with the rise and fall of the water level in the tank, but water does not overflow from the upper surface of the float 21. In addition, multiple sets of medicine tanks 22 are fixed on the top of the improvement tank 19, each corresponding to a different medicine. A piston rod 24 is vertically slidably installed inside each medicine tank 22. The top of the piston rod 24 is sealed to a piston plate 2401, which is in contact with the inner wall of the medicine tank 22. The bottom of the piston rod 24 extends downward out of the medicine tank 22, facing the top surface of the float 21. The bottom of the medicine tank 22 is connected to the bottom of the improvement tank 19 through a drug delivery pipe 23. The relationship between the drug delivery pipe 23 and the float 21 is the same as the relationship between the third drainage pipe 20 and the float 21. During the process of injecting water into the improvement tank 19 through the third drainage pipe 20, the float 21 moves upward synchronously with the rise in water level, pushing each piston rod 24 upward to the corresponding displacement. The piston plate 2401 moves upward with the piston rod 24, quantitatively pressing the improvement agent in the agent tank 22 into the dosing pipe 23, and finally delivering it to the bottom of the improvement tank 19 to mix with the sewage. The rising height of the float 21 is positively correlated with the water injection volume of the improvement tank 19, and the movement displacement of the piston rod 24 is matched accordingly, realizing the automatic ratio of agent injection volume to sewage volume without manual control, ensuring that the concentration of the improvement solution is accurately adapted to the soil improvement needs. Since the displacement of each piston rod 24 is the same, the addition ratio between each agent can be directly designed according to the cross-sectional size of the agent tank 22, which is simple and reliable.

[0034] In this embodiment, in order to improve the precise control structure of the medicine tank 22 and enhance its applicability, such as... Figure 10In each set of medicine containers 22, a sliding plug 25 is vertically and slidably sealed above the piston plate 2401. The sliding plug 25 is in close contact with the inner wall of the medicine container 22 and is the component that directly contacts the medicine. The sliding plug 25 moves under the pressure of the piston plate 2401. Specifically, the internal space of the medicine container 22 above the sliding plug 25 is filled with modified medicine so that the medicine is pushed out when the sliding plug 25 rises. A threaded tube 27 is vertically fixed at the bottom of the medicine container 22. A screw 26 is threaded into the inside of the threaded tube 27. The top of the screw 26 is not in contact with the sliding plug 25, so as to support and limit the sliding plug 25 under normal conditions. In order to ensure that the screw 26 and the threaded tube 27 always maintain a relatively stable connection, a preload spring (not shown in the figure) can be set at one end of the screw 26 located in the threaded tube 27 so as to make contact with the threaded tube 27. By adjusting the length of the screw 26 extending from the threaded tube 27, the upward stroke required for the piston plate 2401 to contact the sliding plug 25 is limited. This ensures that the displacement of the piston plate 2401 is not the same as the displacement of the float 21, but can move with a lag. This allows for precise control of the single-use output of each reagent tank 22. The screw 26 in different reagent tanks 22 has a different extension length, corresponding to different reagent output ratios. When the output of a certain reagent is large, the extension length of its screw 26 extending from the threaded tube 27 will be shorter, so that the reagent tank 22 can start discharging the reagent earlier than other reagent tanks 22. Thus, by adjusting the screw 26, it is possible to adapt to the improvement needs of different soils, flexibly adjust the reagent ratio accuracy, and improve the targeting and effectiveness of soil improvement.

[0035] In the above description of the present invention, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is conventionally placed during use. These terms are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0036] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An external wastewater treatment device for soil improvement, comprising a physical treatment unit and a biological treatment unit, characterized in that: The physical treatment unit includes a physical treatment tank (1) and several inclined plates (6) arranged at an angle inside the physical treatment tank (1). Wastewater is pumped into the physical treatment tank (1) from the top of the physical treatment tank (1) by a wastewater pump (10). The biological treatment unit includes an aerobic tank (13) and an anaerobic tank, which are connected to each other and have aerobic and anaerobic bacterial biofilms respectively inside. The physical treatment tank (1) is connected to the aerobic tank (13) by a first drainage pipe (4) and a three-way valve (18) at the bottom of the aerobic tank (13). The three-way valve (18) is connected to one of its outlets, which is connected to the anaerobic tank (13). A sliding cup (14) is installed in a coaxial sliding seal at the bottom of the aerobic tank (13). Several aerobic biofilm plates (16) are stacked and hinged to each other in sequence inside the bottom port of the sliding cup (14), so that the sewage enters the bottom port of the sliding cup (14) from the three-way valve (18), lifts the sliding cup (14) upward to the limit position, and arranges the aerobic biofilm plates (16) in a serpentine manner inside the aerobic tank (13). When the outlet end of the three-way valve (18) is opened, sewage flows into the anaerobic tank (13). The anaerobic tank (13) is directly connected to the bottom of an improvement tank (19). The improvement tank (19) is equipped with several chemical tanks (22). The chemical tanks (22) are used to inject the corresponding proportion of improver into the improvement tank (19) to mix with the water. The improvement tank (19) is also connected to a drip irrigation system (28) laid on the land.

2. The external wastewater treatment equipment for soil improvement according to claim 1, characterized in that: One end of the inclined plate (6) is located obliquely downward inside the physical treatment tank (1), and the other end is located inside the extension plate (5) on the side wall of the physical treatment tank (1). The bottom of the extension plate (5) near the physical treatment tank (1) has a convex cavity (101). The bottom of the convex cavity (101) has a water leakage hole (10101). A transmission gear (7) is rotatably installed inside the convex cavity (101). The bottom of the inclined plate (6) is provided with a rack that meshes with the transmission gear (7) to drive the inclined plate (6) to slide into / out of the physical tank.

3. The external wastewater treatment equipment for soil improvement according to claim 2, characterized in that: The physical processing tank (1) has a partition (11) in the center of its interior that divides it into two parts, and there are corresponding inclined plates (6) on both sides of the partition (11).

4. The external wastewater treatment equipment for soil improvement according to claim 3, characterized in that: Each inclined plate (6) has a horizontally arranged first drainage pipe (4) located below it; the bottom of the partition (11) is located at the center of the top port of the drain valve (12) at the center of the bottom of the physical treatment tank (1).

5. The external sewage treatment equipment for soil improvement according to claim 3, characterized in that: The front and rear sides of the two extension plates (5) that are opposite each other and open to the left are connected by a barrier (9) so that the two extension plates (5), the two barriers (9) and the physical treatment tank (1) together form a rectangular annular water storage tank. The side wall of each annular water storage tank is connected to a second drainage pipe, which is also connected to the inlet end of the three-way valve (18).

6. The external wastewater treatment equipment for soil improvement according to claim 5, characterized in that: The upper surface of each extension plate (5) is provided with several toothed ridges (8), and the cross-section of the toothed ridges (8) is triangular.

7. The external wastewater treatment equipment for soil improvement according to claim 1, characterized in that: The top port of the physical treatment tank (1) is connected to the sewage pump (10), and a stainless steel grating (2) is provided below the top port; several filter plates (3) are provided below the stainless steel grating (2).

8. The external wastewater treatment equipment for soil improvement according to claim 1, characterized in that: The aerobic biofilm plate (16) is circular. The sides of two adjacent aerobic biofilm plates (16) are hinged to each other. The side of the bottom aerobic biofilm plate (16) is hinged to one side of the bottom surface of the physical treatment tank (1), and the side of the top aerobic biofilm plate (16) is hinged to one side of the inner top surface of the sliding cup (14). It also includes an aeration pipe (17) that is coaxially suspended and fixed in the aerobic tank (13). The bottom end of the aeration pipe (17) is closed, and the side wall has several aeration holes. All aerobic biofilm plates (16) have a strip hole (1601) in the center. The strip hole (1601) allows the aeration pipe (17) to pass through. When all aerobic biofilm plates (16) are stretched to their limit, the aeration pipe (17) does not interfere with the movement of the aerobic biofilm plates (16).

9. The external wastewater treatment equipment for soil improvement according to claim 1, characterized in that: The anaerobic tank (13) is connected to one end of the third drainage pipe (20), and the other end of the third drainage pipe (20) is vertically inserted into the bottom of the improvement tank (19). A float plate (21) is vertically and slidably sealed inside the improvement tank (19). The reagent tanks (22) are all fixed to the top of the improvement tank (19). A piston rod (24) is vertically and slidably installed inside the reagent tank (22). The piston plate (2401) at the top of the piston rod (24) is used to push the improvement reagent in the reagent tank (22) above it to output to a dosing tube. Inside the channel (23), the bottom end of the piston rod (24) is used to contact the top surface of the float (21), and the top end of the medicine tube is connected to the bottom of the improvement tank (19) through the drug delivery pipe (23). The float (21), the third drainage pipe (20), and the medicine pipe are all vertically and slidably sealed together, so that during the process of water injection into the improvement tank (19), the float (21) moves upward and pushes the piston rod (24) to move a corresponding displacement, and the medicine tank (22) injects the corresponding proportion of medicine into the improvement tank (19) through the drug delivery pipe (23).

10. The external wastewater treatment equipment for soil improvement according to claim 9, characterized in that: A sliding plug (25) is vertically and slidably sealed above the piston plate (2401) inside the medicine tank (22). The internal space of the medicine tank (22) above the sliding plug (25) is filled with the improved medicine. A threaded tube (27) is vertically fixed at the bottom inside the medicine tank (22). A screw (26) is threadedly inserted into the threaded tube (27) and elastically contacts it through a pre-tightening spring. The length of the screw (26) is used to adjust the output of the medicine. When the piston plate (2401) moves upward, it can contact the sliding plug (25) and push the sliding plug (25) upward.

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