Small-scale mixed flocculation reactor and process suitable for agricultural wastewater treatment

Abstract

This application provides a small-scale mixing and flocculation reaction device and process for agricultural wastewater treatment, relating to the field of wastewater treatment equipment. The device includes a tank, an air-lift mechanism, a coagulant addition mechanism, a flocculation mechanism, an inlet mechanism, and an outlet mechanism. The air-lift mechanism, inlet mechanism, flocculation mechanism, and outlet mechanism are arranged inside the tank. The coagulant addition mechanism is located in the tank and connected above the air-lift mechanism and the flocculation mechanism. The air-lift mechanism includes an air-lift pipe, through which wastewater from the inlet mechanism is lifted to the coagulant addition mechanism. The flocculation mechanism includes a flocculation pipe assembly and a flocculation plate. The flocculation pipe assembly includes multiple flocculation reaction pipes connected in series. Wastewater from the coagulant addition mechanism forms micro-flocculation particles through the flocculation reaction pipes, flows to the flocculation zone where a flocculation reaction occurs, and then flows out from the outlet mechanism. By lifting the wastewater through air-lift, mixing with the coagulant is achieved simultaneously, ensuring a certain mixing intensity in small-scale agricultural wastewater treatment scenarios without the need for additional power equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sewage treatment equipment, in particular to a small mixed flocculation reaction device and process suitable for agricultural sewage treatment. BACKGROUND

[0002] At present, the mixed flocculation in the chemical phosphorus removal process of agricultural sewage treatment device mainly adopts two ways of hydraulic coagulation and mechanical coagulation.

[0003] However, when applied to small volume agricultural sewage treatment, hydraulic coagulation needs a certain water loss to achieve flocculation effect, and the water depth of the flocculation device needs to be at a lower position. However, in the small volume agricultural sewage treatment scene, it is impossible to ensure that the flocculation device is at a lower position. Secondly, the flocculation device used in mechanical coagulation needs additional power equipment to ensure the stirring intensity to achieve flocculation effect. In the small volume agricultural sewage treatment scene, it is not conducive to place additional power equipment, which not only causes more narrow space but also increases energy consumption. Therefore, the existing flocculation devices based on hydraulic coagulation and mechanical coagulation are limited in agricultural sewage treatment.

[0004] Therefore, there is a lack of a flocculation device suitable for small volume agricultural sewage treatment scene and without additional power equipment and capable of ensuring a certain mixing intensity in the prior art. SUMMARY

[0005] The purpose of the present application is to provide a small mixed flocculation reaction device and process suitable for agricultural sewage treatment, so as to solve the problem that the existing flocculation device cannot achieve a certain water loss without additional power equipment and is suitable for small volume agricultural sewage treatment scene in the prior art.

[0006] In order to achieve the above purpose, the present application provides a small mixed flocculation reaction device suitable for agricultural sewage treatment, which comprises a pool body, a gas stripping mechanism, a coagulant adding mechanism, a flocculation mechanism, a water inlet mechanism and a water outlet mechanism. The inside of the pool body is divided into a water inlet area and a flocculation area by a partition plate. The gas stripping mechanism and the water inlet mechanism are arranged in the water inlet area. The flocculation mechanism and the water outlet mechanism are arranged in the flocculation area. The coagulant adding mechanism is fixed in the pool body and connected above the gas stripping mechanism and the flocculation mechanism.

[0007] The air stripping mechanism includes an air stripping pipe through which sewage of the water inlet mechanism is lifted by air stripping to the coagulant additive mechanism; the flocculation mechanism includes a flocculation pipe assembly and a floe flow plate; the flocculation pipe assembly includes a plurality of flocculation reaction pipes connected in series; the floe flow plate is connected to the inner wall of the pool body of the flocculation zone; after sewage of the coagulant additive mechanism flows out to the flocculation zone after micro-floc particles are formed in the flocculation reaction pipes, flocculation reaction occurs under the action of the flocculation reaction pipes and the floe flow plate, and then the sewage flows out through the water outlet mechanism.

[0008] Further, a partition wall is also included, which is connected to the inner wall of the pool body of the flocculation zone side by side to divide the flocculation zone into a plurality of corridors; the flocculation reaction pipes are evenly distributed in the plurality of corridors of the flocculation zone.

[0009] Further, the flocculation pipe assembly also includes a water inlet pipe, which is in communication with the first flocculation reaction pipe; the top of the water inlet pipe is movably connected with the movable sleeve, which is in communication with the coagulant additive mechanism; by adjusting the height of the movable sleeve, the drop height of the sewage can be adjusted.

[0010] Further, the flocculation pipe assembly also includes a drain pipe, which is in communication with the last flocculation reaction pipe; after the sewage enters the plurality of flocculation reaction pipes in the flocculation pipe assembly in sequence through the water inlet pipe to form micro-floc particles, the sewage flows out from the drain pipe to the flocculation zone to undergo flocculation.

[0011] Further, a Pohl ball is arranged inside the flocculation reaction pipe to interfere with the water flow to form a cyclone.

[0012] Further, a vent is arranged at the top of the flocculation reaction pipe, which is used to communicate with the atmosphere.

[0013] Further, a coagulant dosing port is arranged at the bottom of the air stripping pipe, through which coagulant is added to the air stripping pipe.

[0014] Further, the air stripping mechanism also includes an air pipe, which is arranged side by side with the air stripping pipe; the bottom of the air pipe is in communication with the bottom of the air stripping pipe, and air enters the air stripping pipe through the air pipe.

[0015] Further, the coagulant additive mechanism includes a mixing tank, which has a hollow cubic structure; the top of the mixing tank is in communication with the atmosphere.

[0016] Further, the water inlet mechanism includes a water inlet pipe, which is in communication with the water inlet zone; the water inlet pipe is close to the bottom of the pool body, and sewage enters the water inlet zone through the water inlet pipe.

[0017] Further, the water outlet mechanism comprises a water outlet pipe, which is in communication with the pool body of the flocculation zone at a position close to the water inlet area, and the water outlet pipe is close to the bottom of the pool body, through which the sewage is discharged out of the pool body.

[0018] To achieve the above object, in a second aspect, the present application also provides a small-scale mixed flocculation reaction process suitable for agricultural sewage treatment, which uses the small-scale mixed flocculation reaction device suitable for agricultural sewage treatment described above, and the specific steps are as follows:

[0019] S1: The sewage enters the water inlet area through the water inlet pipe, and a coagulant is added into the air-lift pipe;

[0020] S2: The sewage is transported into the mixing tank under the air-lifting action of the air-lift pipe;

[0021] S3: A coagulant aid is added in the mixing tank, and the sewage mixes with the coagulant aid in the waterfall process from the mixing tank into the flocculation reaction pipe, and the sewage flows through a plurality of flocculation reaction pipes and forms micro-floc particles in the flocculation reaction pipe;

[0022] S4: The sewage flows out of the flocculation reaction pipe into the flocculation area, and the sewage sequentially passes through a plurality of corridors and flows out of the water outlet pipe after the flocculation reaction under the action of the flocculation reaction pipe and the flocculation flow plate.

[0023] By using the technical scheme, the small-scale mixed flocculation reaction device and process suitable for agricultural sewage treatment provided by the present application have the following technical effects compared with the prior art:

[0024] The inside of the pool body is divided into a water inlet area and a flocculation area by a partition plate; the water inlet area is provided with an air-lifting mechanism and a water inlet mechanism; the flocculation area is provided with a flocculation mechanism and a water outlet mechanism; the coagulant aid adding mechanism is fixed in the pool body and connected above the air-lifting mechanism and the flocculation mechanism; the water inlet area is responsible for storing un-flocculated sewage, and the sewage realizes flocculation reaction in the flocculation area;

[0025] The air-lifting mechanism comprises an air-lift pipe, and the sewage of the water inlet mechanism is lifted into the coagulant aid adding mechanism by the air-lifting action of the air-lift pipe; in use, a coagulant is added in the air-lifting mechanism, the mixing effect of the coagulant is ensured by air-lifting stirring, at the same time, the liquid level is lifted to a certain height before coagulation and precipitation, the mixing intensity is ensured at the same time of liquid level lifting, at the same time, a coagulant aid is added in the coagulant aid adding mechanism, the sewage falls from the coagulant aid adding mechanism to the flocculation mechanism below, and the sewage and the coagulant aid are fully mixed by means of the great impact force in the waterfall process, the mixing intensity is ensured, the required mixing intensity can be achieved in the small-scale agricultural sewage treatment scene, and no additional power equipment is needed;

[0026] The flocculation mechanism comprises a flocculation tube assembly and a floe flow plate; the flocculation tube assembly comprises a plurality of flocculation reaction tubes connected in series; the floe flow plate is connected to the inner wall of the pool body of the flocculation zone; the sewage of the coagulant aid adding mechanism flows out to the flocculation zone after forming micro-floc particles in the flocculation reaction tube, and flows out through the water outlet mechanism after flocculation reaction under the action of the flocculation reaction tube and the floe flow plate; due to the joint action of the floe flow plate and the flocculation reaction tube, the boundary condition of turbulent flow is changed, the side wall of turbulent flow is increased, the turbulence is formed, the vortex zone is formed behind the floe flow plate, the contact collision times and effective collision times of the micro-floc particles in the flocculation zone are increased, so that good flocculation effect is ensured, and the flocculation process is completed. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art of the present application, the drawings needed to be used in the specific embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 The front view schematic diagram of the small mixed flocculation reaction device suitable for agricultural sewage treatment provided by the embodiment of the present application is shown in the figure.

[0029] Figure 2 The Figure 1 schematic diagram of A-A section in the figure.

[0030] Figure 3 The Figure 1 schematic diagram of C-C section in the figure.

[0031] Figure: 1-pool body, 2-air lifting mechanism, 21-air lifting pipe, 22-air pipe, 3-coagulant aid adding mechanism, 31-mixing tank, 4-flocculation mechanism, 41-flocculation tube assembly, 411-flocculation reaction tube, 412-inlet pipe, 413-drainage pipe, 42-floe flow plate, 5-water inlet mechanism, 51-inlet pipe, 6-water outlet mechanism, 61-outlet pipe, 7-separation plate, 8-inlet zone, 9-flocculation zone, 10-separation wall, 11-corridor, 12-elbow, 13-movable sleeve, 14-air vent, 15-Paul ball, 16-coagulant adding port. DETAILED DESCRIPTION

[0032] The technical solutions of the present application will be described below in conjunction with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0033] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] Embodiment 1

[0036] The small-scale mixed flocculation reaction device for agricultural wastewater treatment provided in the present application, as shown in the drawing, comprises a pool body 1, a gas lifting mechanism 2, a coagulant adding mechanism 3, a flocculation mechanism 4, a water inlet mechanism 5 and a water outlet mechanism 6. Figure 2

[0037] The inside of the pool body 1 is divided into a water inlet area 8 and a flocculation area 9 by a partition plate 7; the gas lifting mechanism 2 and the water inlet mechanism 5 are arranged in the water inlet area 8; the flocculation mechanism 4 and the water outlet mechanism 6 are arranged in the flocculation area 9; the coagulant adding mechanism 3 is fixed in the pool body 1 and connected above the gas lifting mechanism 2 and the flocculation mechanism 4; the gas lifting mechanism 2 is connected with the water inlet mechanism 5, the water inlet mechanism 5 is connected with the pool body 1, the water outlet mechanism 6 is connected with the pool body 1, and the flocculation mechanism 4 is fixed in the inside of the pool body 1 by being connected with the coagulant adding mechanism 3.

[0038] The gas lifting mechanism 2 comprises a gas lifting pipe 21, and the sewage of the water inlet mechanism 5 is lifted to the coagulant adding mechanism 3 by the gas lifting action of the gas lifting pipe 21, and the coagulant is added to the sewage in the coagulant adding mechanism 3.

[0039] As shown in the drawing, Figure 1 The flocculation mechanism 4 comprises a flocculation pipe assembly 41 and a flocculation flow plate 42; the flocculation pipe assembly 41 comprises a plurality of flocculation reaction pipes 411 connected in series; and the flocculation flow plate 42 is connected to the inner wall of the pool body 1 of the flocculation area 9.

[0040] ​The whole working principle is as follows: sewage from outside enters the water inlet area 8 of the pool body 1, and is lifted from the air-lifting pipe 21 to the coagulant adding mechanism 3 connected to the top of the air-lifting pipe 21 through the air-lifting effect of the air-lifting mechanism 2. Under the action of air-lifting, the sewage is fully mixed with the coagulant in the air-lifting pipe 21. After adding the coagulant in the coagulant adding mechanism 3, the sewage flows into the flocculation reaction pipe 411 from the coagulant adding mechanism 3. The process from the coagulant adding mechanism 3 to the flocculation reaction pipe 411 is a drop process. In this process, the sewage and the coagulant are mixed through the drop, and the effect of full mixing is achieved by using the great impact force generated in the process of the drop of the sewage in the coagulant adding mechanism 3. The micro-floc particles formed in the flocculation reaction pipe 411 flow out to the flocculation area 9 of the pool body 1. In the process of flowing through the flocculation area 9, the sewage touches the outer wall of the flocculation reaction pipe 411 and the flocculation flow plate 42. The boundary conditions of turbulent flow are changed by the action of the flocculation reaction pipe 411 and the flocculation flow plate 42, the edge wall of turbulent flow is increased, the turbulence is formed, and the vortex area is formed after the flocculation flow plate 42, the contact collision times and the effective collision times of the micro-floc particles in the flocculation area 9 are increased, so as to ensure good flocculation effect. Finally, the sewage flows out through the water outlet mechanism 6.

[0041] As a preferred embodiment, the partition wall 10 is connected to the inner wall of the pool body 1 in the flocculation area 9 in parallel, and divides the flocculation area 9 into a plurality of corridors 11. The flocculation reaction pipes 411 are uniformly distributed in the plurality of corridors 11 in the flocculation area 9.

[0042] In this embodiment, the partition wall 10 is distributed along the width direction of the flocculation area 9 at equal intervals, and the flocculation area 9 is divided into a flow channel composed of a plurality of corridors 11 by the partition wall 10. The plurality of corridors 11 are sequentially connected in a looped flow channel. The sewage flowing out of the flocculation reaction pipe 411 flows through the flow channel and is deflected in the flow channel to flow out of the water outlet mechanism 6.

[0043] As a preferred embodiment, the flocculation flow plate 42 is arranged along the length direction of the pool body 1 at equal intervals, and the flocculation flow plate 42 is connected to the inner wall of the pool body 1 by welding.

[0044] The flocculation flow plate 42 is arranged to change the boundary conditions of the turbulent flow of the sewage, increase the edge wall of the turbulent flow, and increase the turbulence degree of the flow, so as to form turbulence and form a vortex area after flowing through the flocculation flow plate 42, increase the contact collision times and the effective collision times of the micro-floc particles in the flocculation area 9, and ensure good flocculation effect.

[0045] In a preferred embodiment, the flocculation pipe assembly 41 further includes an inlet pipe 412, which is connected to the first-end flocculation reaction pipe 411 via an elbow 12. The top of the inlet pipe 412 is movably connected to a movable sleeve 13, which is connected to the coagulant addition mechanism 3. The height of the wastewater drop can be adjusted by adjusting the height of the movable sleeve 13.

[0046] In this embodiment, since a movable sleeve 13 is movably connected above the inlet pipe 412, the wastewater from the coagulant addition mechanism 3 must first pass through the movable sleeve 13 before flowing into the inlet pipe 412, and then further into the flocculation reaction pipe 411. Since the wastewater and coagulant are mixed by a cascade, the huge impact force generated by the water flow during the cascade of the coagulant addition mechanism 3 achieves a thorough mixing effect. Therefore, the movable sleeve 13 is movably connected to the inlet pipe 412 to adjust the height of the movable sleeve 13 relative to the inlet pipe 412. This allows the optimal mixing effect to be achieved by adjusting the height of the movable sleeve 13. By adjusting the height of the movable sleeve 13, the height of the cascade can be adjusted, thereby controlling the mixing intensity.

[0047] Specifically, to achieve the best mixing effect, the water level difference between the inside and outside of the coagulant addition mechanism 3 needs to be maintained at 0.3 to 0.4 m.

[0048] Specifically, the movable sleeve 13 and the water inlet pipe 412 can be connected by a socket joint, allowing for height adjustment through direct insertion and removal. A rubber ring is then used to seal the movable sleeve 13 and the water inlet pipe 412 to prevent leakage. Alternatively, the movable sleeve 13 and the water inlet pipe 412 can be connected by threads. During use, the height of the movable sleeve 13 can be adjusted by rotating its position relative to the water inlet pipe 412.

[0049] In a preferred embodiment, the flocculation tube assembly 41 further includes a drain pipe 413, which is connected to the end flocculation reaction pipe 411 via an elbow 12. Wastewater enters the multiple flocculation reaction pipes 411 in the flocculation tube assembly 41 through the inlet pipe 412, forms micro-flocculation particles, and then flows out from the drain pipe 413 to the flocculation zone 9 to flocculate.

[0050] In a preferred embodiment, the top of the flocculation reaction tube 411 is provided with a vent 14 for communicating with the atmosphere.

[0051] In a preferred embodiment, a Pall ball 15 is provided inside the flocculation reaction tube 411 to interfere with the water flow to form a vortex.

[0052] The purpose of setting up the Pall balls 15 is that when the sewage flows through the Pall balls 15 in the flocculation reaction pipe 411, the porous structure of the Pall balls 15 will interfere with the water flow, thereby forming many micro vortices, providing suitable hydraulic conditions for flocculation. Then, after the sewage flows through multiple flocculation reaction pipes 411, the sewage and the coagulant mixed in the sewage will react more fully under the action of the water flow in the flocculation reaction pipes 411, thereby forming micro flocs.

[0053] In a preferred embodiment, a coagulant inlet 16 is provided at the bottom of the air lift pipe 21, through which the coagulant is added into the air lift pipe 21.

[0054] In a preferred embodiment, the air lifting mechanism 2 further includes an air pipe 22, which is arranged in parallel with the air lifting pipe 21. The bottom of the air pipe 22 is connected to the bottom of the air lifting pipe 21, and air enters the air lifting pipe 21 through the air pipe 22 to provide airflow to the air lifting pipe 21.

[0055] As a preferred embodiment, such as Figure 3 As shown, the water inlet mechanism 5 includes a water inlet pipe 51, which is connected to the water inlet area 8. The water inlet pipe 51 is close to the bottom of the pool body 1 and is used as a pipe for sewage to enter the pool body 1.

[0056] As a preferred embodiment, such as Figure 3 As shown, the water outlet mechanism 6 includes a water outlet pipe 61, which is connected to the pool body 1 of the flocculation zone 9 near the water inlet zone 8. The water outlet pipe 61 is located near the bottom of the pool body 1 and is used as a pipe for the sewage after flocculation reaction to flow out of the pool body 1.

[0057] In a preferred embodiment, the coagulant addition mechanism 3 includes a mixing tank 31, which has a hollow cubic structure and its top is open to the atmosphere. To achieve the best mixing effect, the water level difference between the inside and outside of the mixing tank 31 needs to be maintained at 0.3 to 0.4 m.

[0058] Example 2

[0059] This application provides a small-scale mixed flocculation reaction process suitable for agricultural wastewater treatment, applied to the mixed flocculation reaction device provided in Example 1 above. The specific steps of this process are as follows:

[0060] S1: Wastewater enters the inlet area through the inlet pipe 51, and coagulant is added to the air-lift pipe 21.

[0061] At the bottom of the air lift pipe 21, there is a pre-reserved coagulant inlet 16 for adding coagulant, which can be aluminum salt or iron salt.

[0062] S2: Under the air-lifting action of the air-lift pipe 21, the sewage is transported to the mixing tank 31.

[0063] Through the gas action of the air lift pipe 21, the sewage and coagulant can be fully mixed while the liquid level is raised.

[0064] S3: Add coagulant aid to mixing tank 31. Wastewater is mixed with coagulant aid during the process of entering flocculation reaction pipe 411 from mixing tank 31. Wastewater flows through multiple flocculation reaction pipes 411 and forms micro flocs in flocculation reaction pipes 411.

[0065] Wastewater enters the mixing tank 31, first passing through the movable sleeve 13 and the inlet pipe 412, before flowing into the flocculation reaction pipe 411. The coagulant aid can be a polymeric organic compound (PAM). The coagulant and wastewater are mixed via a cascading system, specifically utilizing the significant impact generated by the water flow as it falls from the inlet pipe 412 to the flocculation reaction pipe 411 to achieve mixing. Since the movable sleeve 13 is movably connected to the top of the inlet pipe 412, the cascading height can be adjusted by changing the height of the movable sleeve 13, thereby controlling the mixing intensity. To ensure optimal mixing, the water level difference between the inside and outside of the mixing tank 31 should be maintained at 0.3–0.4 m in practical applications.

[0066] Multiple flocculation reaction tubes 411 are vertically distributed and connected in series to form a multi-row structure. Each flocculation reaction tube 411 is filled with a circular Pall ball 15. When the sewage flows through the Pall ball 15 structure of the multiple flocculation reaction tubes 411, the porous structure of the Pall ball 15 will interfere with the water flow, thereby forming many micro eddies, which provide suitable hydraulic conditions for the final flocculation reaction. Then, when the sewage and coagulant aid pass through the flocculation reaction tubes 411, they react fully under the action of water flow to form micro flocs.

[0067] S4: Wastewater flows out of the flocculation reaction pipe 411 and enters the flocculation zone 9. The wastewater passes through multiple corridors 11 in sequence. Under the combined action of the flocculation reaction pipe 411 and the flocculation plate 42, the wastewater undergoes a flocculation reaction and then flows out from the drain pipe 413.

[0068] Because the flocculation zone 9 is divided into multiple corridors 11 by partition walls, and the multiple corridors 11 are evenly distributed along the width of the pool body 1, and the multiple corridors 11 are connected end to end to form a water flow channel, when the sewage flows out of the flocculation reaction pipe 411 and flows in the water flow channel, the sewage will touch the outer wall of the flocculation plate 42 and the flocculation reaction pipe 411. Therefore, under the combined action of the flocculation plate 42 and the flocculation reaction pipe 411, the boundary conditions of the turbulent flow will be changed, the side walls of the turbulent flow will be increased, thereby increasing the turbulence of the flow, forming turbulence, and forming a vortex zone behind the flocculation plate. This increases the number of contact collisions and effective collisions of micro-floc particles in the flocculation zone 9, resulting in a good flocculation effect. After the flocculation reaction process is completed, the sewage flows out through the outlet pipe.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A small-scale mixing and flocculation reaction device suitable for agricultural wastewater treatment, characterized in that, The system includes a tank body, an air-lift mechanism, a coagulant addition mechanism, a flocculation mechanism, a water inlet mechanism, and a water outlet mechanism. The interior of the tank body is divided into a water inlet zone and a flocculation zone by a partition plate. The air-lift mechanism and the water inlet mechanism are installed in the water inlet zone. The flocculation mechanism and the water outlet mechanism are installed in the flocculation zone. The coagulant addition mechanism is fixed in the tank body and connected above the air-lift mechanism and the flocculation mechanism. The air-lift mechanism includes an air-lift pipe, through which the wastewater from the inlet mechanism is lifted to the coagulant addition mechanism. The flocculation mechanism includes a flocculation pipe assembly and a flocculation plate. The flocculation pipe assembly includes multiple flocculation reaction pipes connected in series. The flocculation plate is connected to the inner wall of the pool in the flocculation zone. The wastewater from the coagulant addition mechanism forms micro-flocculation particles after passing through the flocculation reaction pipes and flows out into the flocculation zone. Under the action of the flocculation reaction pipes and the flocculation plate, a flocculation reaction occurs, and the wastewater flows out through the outlet mechanism. The flocculation pipe assembly also includes a water inlet pipe, which is connected to the flocculation reaction pipe at the beginning. A movable sleeve is movably connected to the top of the water inlet pipe, and the movable sleeve is connected to the coagulant addition mechanism. The height of the wastewater drop can be adjusted by adjusting the height of the movable sleeve. The flocculation tube assembly also includes a drain pipe, which is connected to the end of the flocculation reaction tube; wastewater enters the multiple flocculation reaction tubes in the flocculation tube assembly through the inlet pipe in sequence, forms micro-flocs, and then flows out from the drain pipe to the flocculation zone to flocculate. A Pall ball is installed inside the flocculation reaction tube to disrupt the water flow and create a vortex.

2. The small-scale mixing and flocculation reaction device for agricultural wastewater treatment according to claim 1, characterized in that, It also includes partition walls, which are connected side by side to the inner wall of the pool in the flocculation zone, dividing the flocculation zone into multiple corridors; the flocculation reaction pipes are evenly distributed in the multiple corridors of the flocculation zone.

3. The small-scale mixing and flocculation reaction device for agricultural wastewater treatment according to claim 1, characterized in that, The air lifting mechanism also includes an air pipe, which is arranged in parallel with the air lifting pipe. The bottom of the air pipe is connected to the bottom of the air lifting pipe, and air enters the air lifting pipe through the air pipe.

4. The small-scale mixing and flocculation reaction device for agricultural wastewater treatment according to claim 2, characterized in that, The coagulant addition mechanism includes a mixing tank, which has a hollow cubic structure and whose top is connected to the atmosphere.

5. The small-scale mixing and flocculation reaction device for agricultural wastewater treatment according to claim 4, characterized in that, The water inlet mechanism includes a water inlet pipe connected to the water inlet area. The water inlet pipe is located near the bottom of the pool body, and sewage enters the water inlet area through the water inlet pipe.

6. The small-scale mixing and flocculation reaction device for agricultural wastewater treatment according to claim 5, characterized in that, The water outlet mechanism includes a water outlet pipe, which is connected to the pool body of the flocculation zone near the water inlet area. The water outlet pipe is located near the bottom of the pool body, and wastewater is discharged outside the pool body through the water outlet pipe.

7. A small-scale mixed flocculation reaction process for agricultural wastewater treatment, using the small-scale mixed flocculation reaction device for agricultural wastewater treatment as described in claim 6, characterized in that, The specific steps are as follows: S1: Wastewater enters the inlet area through the inlet pipe, and coagulant is added to the air-lift pipe; S2: Under the air-lifting action of the air-lift pipe, the sewage is transported to the mixing tank; S3: Add a coagulant aid to the mixing tank. During the process of the sewage entering the flocculation reaction pipe from the mixing tank, it mixes with the coagulant aid. The sewage flows through multiple flocculation reaction pipes and forms micro flocs in the flocculation reaction pipes. S4: Wastewater flows out of the flocculation reaction pipe and into the flocculation zone. The wastewater passes through multiple corridors in sequence and undergoes a flocculation reaction under the action of the flocculation reaction pipe and the flocculation plate before flowing out from the outlet pipe.

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