A multi-stage fertilizer wastewater treatment device

Abstract

The invention provides a multi-stage fertilizer wastewater treatment device, which relates to the technical field of fertilizer wastewater treatment, and comprises: a purification body, an interception body is arranged above the purification body; a driving disk is arranged above the interception body, a filter screen is fixedly installed on the outer peripheral surface of the driving disk, and the fertilizer wastewater is intercepted and filtered by the filter screen. Based on the uniform rotation of the filter screen, the fertilizer wastewater transported into the matching groove will not only contact the same position of the filter screen, and the solid impurities intercepted on the filter screen are blown away by airflow and the solid impurities after being blown away are negatively pressure extracted, so as to ensure that when the area of ​​the filter screen after being blown away and negatively pressure extracted is subsequently rotated to the corresponding wastewater transport hole, there is no solid impurities remaining and blocking at the mesh hole, so as to solve the problem that when the fertilizer wastewater is treated by the existing mesh screen interception method, a large amount of solid impurities will be intercepted by the mesh screen in a short time, causing clogging of the mesh screen and affecting the infiltration efficiency of the fertilizer wastewater.

Description

Technical Field

[0001] The invention relates to the technical field of fertilizer wastewater treatment, and in particular to a multi-stage fertilizer wastewater treatment device. Background Art

[0002] When fertilizers are prepared and produced, a large amount of fertilizer wastewater will be generated. In order to avoid the fertilizer wastewater from being directly discharged into the river and causing harm to the environment and human body, the fertilizer wastewater needs to be purified. The current treatment method for fertilizer wastewater is mostly to first use a mesh plate to intercept the solid impurities contained in the fertilizer wastewater to filter and remove impurities, and then purify the water quality through purification materials such as activated carbon to make it meet the emission standards; and the above-mentioned treatment method for fertilizer wastewater, when it is actually applied, due to the large amount of solid impurities contained in the fertilizer wastewater, the mesh plate interception method will cause the mesh plate to intercept a large amount of solid impurities in a short time, and the large amount of solid impurities intercepted will cause the mesh plate to be blocked, thereby affecting the penetration efficiency of the fertilizer wastewater, and as the mesh plate is blocked more, the impact pressure on the mesh plate will also increase, which is easy to cause deformation and damage to the mesh plate. Summary of the invention

[0003] The invention relates to a multi-stage fertilizer wastewater treatment device, which solves the problem that when fertilizer wastewater is treated by a mesh plate interception method, the mesh plate will intercept a large amount of solid impurities in a short time, causing blockage of the mesh plate, affecting the penetration efficiency of the fertilizer wastewater, and as the blockage of the mesh plate intensifies, the impact pressure on the mesh plate will also increase accordingly, which is easy to cause deformation and damage of the mesh plate.

[0004] The present invention provides a multi-stage fertilizer wastewater treatment device, which specifically includes: a purification body, the purification body is a square block structure, and a purification tank with a square trough structure is opened on the top surface of the purification body; a convergence tank is opened on the bottom surface of the inner end of the purification tank, the top of the convergence tank is a square structure, and its side length is consistent with the side length of the purification tank, and the bottom of the purification tank is a circular structure; a supporting frame with a square frame structure is fixedly installed on the bottom end surface of the purification body; a discharge pipe connected to the convergence tank is installed on the bottom end surface of the purification body, and a valve is installed on the discharge pipe; the discharge pipe is connected to the bottom position of the circular structure in the purification tank; A guide plate is fixedly installed on the left side of the inner end of the purification tank. The guide plate is arranged in an inclined shape with the left side higher and the right side lower. The front end face and the rear end face of the guide plate are respectively fixedly connected to the front side face and the rear side face of the inner end of the purification tank, and the right end face of the guide plate does not contact the right side face of the inner end of the purification tank; the right end face of the guide plate is fixedly connected to the right side face of the inner end of the purification tank through an interception mesh plate, the interception mesh plate and the guide plate are arranged in the same plane, and the front end face and the rear end face of the interception mesh plate are respectively fixedly connected to the front side face and the rear side face of the inner end of the purification tank; activated carbon is added in the purification tank located above the guide plate and the interception mesh plate.

[0005] Furthermore, an installation groove a is provided at the four edge angles of the bottom end surface of the purification body, and an installation hole a penetrating the top surface of the purification body is provided on the inner end top surface of the four installation grooves a; an intercepting body with a square block structure is provided above the purification body, and a stud is fixedly connected to each of the four adjacent edge angles of the bottom end surface and the top end surface of the intercepting body, and a nut is threadedly installed on each stud; the four studs located on the lower side are respectively plugged into the four installation holes a and are locked and fixed by nuts.

[0006] Furthermore, a closed body with a square block structure is provided above the intercepting body, and an installation groove b is opened at the four edge corners of the top surface of the closed body, and an installation hole position b that penetrates the bottom end surface of the closed body is opened on the inner end bottom surface of the four installation grooves b; the four studs located on the upper side are respectively plugged into the four installation holes b and are locked and fixed by nuts.

[0007] Furthermore, an installation cavity is opened in the central part of the interception body, and a group of motors are fixedly installed on the top surface of the inner end of the installation cavity; a driving disk is provided above the interception body, and the motor shaft end passes through the top surface of the interception body and is fixedly connected to the axial center of the driving disk; a filter mesh plate with an annular mesh plate structure is fixedly installed on the outer peripheral surface of the driving disk; a control box is installed on the front end surface of the interception body, and the control box is electrically connected to the motor.

[0008] Furthermore, the top surface of the interception body is in a circular array with six support members rotatably installed therein, and the support members are steel balls; the support members are located at the edge of the adjacent filter screen plate; the support members are in contact with the bottom end surface of the filter screen plate.

[0009] Furthermore, a guide groove with a circular groove structure is provided on the left side of the top end surface of the intercepting body, and the guide groove is located below the filter screen plate; a convergence discharge opening connected to the guide groove is provided on the left side of the bottom end surface of the intercepting body, the top of the convergence discharge opening is a circular structure, and its diameter is consistent with the diameter of the guide groove, the bottom of the convergence discharge opening is a rectangular structure, the length of the convergence discharge opening is consistent with the side length of the purification tank, and the left edge of the bottom opening end of the convergence discharge opening coincides with the left edge of the top opening end of the purification tank.

[0010] Furthermore, a matching groove with a circular groove structure is provided on the bottom end surface of the closed body, and the diameter of the matching groove is larger than the outer diameter of the filter mesh plate; the top surface of the inner end of the filter mesh plate does not contact the top surface of the filter mesh plate; a wastewater conveying pipe is fixedly installed on the left side of the top surface of the closed body relative to the axial center of the guide groove, and a wastewater conveying hole penetrating the matching groove is provided on the axial center of the wastewater conveying pipe, and the diameter of the wastewater conveying hole is smaller than the diameter of the guide groove.

[0011] Furthermore, an impurity extraction pipe is fixedly installed on the right side of the top surface of the closed main body, and an impurity extraction hole penetrating the matching groove is opened at the axial center of the impurity extraction pipe, the impurity extraction hole corresponds to the position of the filter plate, and the impurity extraction pipe is connected to the pipe installation based on negative pressure extraction; an airflow input pipe is fixedly installed on the right end surface of the intercepting main body, and an airflow conveying hole connected to the top surface of the intercepting main body is opened at the axial center of the airflow input pipe, the airflow conveying hole and the impurity extraction hole are coaxially arranged, and the airflow input pipe is connected to the pipe installation based on airflow input.

[0012] The present invention provides a multi-stage fertilizer wastewater treatment device, which has the following beneficial effects:

[0013] The present invention intercepts and filters fertilizer wastewater through a filter screen plate to intercept and separate solid impurities in the fertilizer wastewater, and based on the uniform rotation setting of the filter screen plate, the fertilizer wastewater uniformly conveyed into the matching groove will not only contact the same position of the filter screen plate, and the present invention also blows away the solid impurities intercepted on the filter screen plate through airflow and extracts the solid impurities after being blown away by negative pressure, which can be coordinated with the uniform rotation of the filter screen plate to ensure that when the area of ​​the filter screen plate after being blown away and negatively pressure extracted is subsequently rotated back to the corresponding wastewater conveying hole, there is no solid impurities remaining in the mesh to block the mesh, so as to ensure that it can play its due filtering and intercepting role and ensure the interception and filtration quality of the fertilizer wastewater.

[0014] The present invention purifies and filters the fertilizer wastewater based on the filter screen plate, and the present invention uses the activated carbon to intercept and filter the fertilizer wastewater. The guide plate is intercepted and guided by the guide plate, so that after the fertilizer wastewater enters the purification tank, it needs to flow to the lower right along the guide plate, and it will inevitably achieve all-round contact with the activated carbon during the flow process, thereby increasing the contact time between the fertilizer wastewater and the activated carbon on the basis of ensuring the utilization rate of the activated carbon, so as to maximize the purification quality of the fertilizer wastewater, and through the multi-stage treatment of the fertilizer wastewater, ensure that the fertilizer wastewater discharged subsequently meets the emission standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0016] The drawings described below are only related to some embodiments of the present invention, but are not intended to limit the present invention.

[0017] In the attached picture:

[0018] Figure 1 The top axial side structure schematic diagram of the present application is shown;

[0019] Figure 2 The bottom shaft side structure schematic diagram of the present application is shown;

[0020] Figure 3 It shows a schematic diagram of the top axial structure of the purification body and the sealing body of the present application when they are separated;

[0021] Figure 4 It shows a schematic diagram of the bottom axial structure of the purification body and the closed body of the present application when they are separated;

[0022] Figure 5 It shows a schematic diagram of the top axial side structure of the interception body and the purification body of the present application in a separated state;

[0023] Figure 6 It shows a schematic diagram of the bottom shaft side structure of the interception body and the purification body of the present application in a separated state;

[0024] Figure 7 It shows a schematic structural diagram of the filter screen plate and the drive disc of the present application in a separated state;

[0025] Figure 8 A cross-sectional structural schematic diagram of the present application is shown;

[0026] Fig. 9 This application shows Figure 8 AA cross-sectional structure diagram;

[0027] Fig.10 This application shows Figure 8Schematic diagram of the cross-sectional structure of the middle BB;

[0028] Reference numerals list

[0029] 1. Purification body; 101. Support frame; 102. Installation slot a; 103. Discharge pipe; 104. Installation hole a; 105. Purification tank; 106. Guide plate; 107. Intercepting mesh plate; 108. Converging tank;

[0030] 2. Intercepting body; 201. Control box; 202. Airflow input pipe; 203. Airflow delivery hole; 204. Stud; 205. Nut; 206. Motor; 207. Drive plate; 208. Filter screen; 209. Converging discharge opening; 2010. Guide groove; 2011. Support member; 2012. Installation cavity;

[0031] 3. Closed body; 301. Installation slot b; 302. Wastewater delivery pipeline; 303. Wastewater delivery hole; 304. Impurity extraction pipeline; 305. Impurity extraction hole; 306. Installation hole position b; 307. Matching groove;

[0032] 4. Activated carbon. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Example: Please refer to Figures 1 to 10 :

[0035] The present invention proposes a multi-stage fertilizer wastewater treatment device, comprising: a purification body 1, the purification body 1 is a square block structure, the top surface of the purification body 1 is provided with a purification tank 105 with a square groove structure; the inner bottom surface of the purification tank 105 is provided with a convergence tank 108, the top of the convergence tank 108 is a square structure, the side length of which is consistent with the side length of the purification tank 105, and the bottom of the purification tank 105 is a circular structure; a supporting frame 101 with a square frame structure is fixedly installed on the bottom end surface of the purification body 1; a discharge pipe 103 connected to the convergence tank 108 is installed on the bottom end surface of the purification body 1, and the discharge pipe 103 is connected to the convergence tank 108. 3 is installed with a valve; the discharge pipe 103 is connected to the bottom position of the circular structure in the purification tank 105; a guide plate 106 is fixedly installed on the left side of the inner end of the purification tank 105, and the guide plate 106 is arranged in an inclined shape with the left side higher and the right side lower. The front end face and the rear end face of the guide plate 106 are respectively fixedly connected to the front side face and the rear side face of the inner end of the purification tank 105, and the right end face of the guide plate 106 does not contact the right side face of the inner end of the purification tank 105; the right end face of the guide plate 106 is fixedly connected to the right side face of the inner end of the purification tank 105 through an interception mesh plate 107, and the interception mesh plate 107 is arranged on the same plane as the guide plate 106, and the interception mesh plate 107 is arranged on the same plane as the guide plate 106, and the interception mesh plate 107 is arranged on the same plane as the guide plate 106. The front end face and the rear end face of the intercepting mesh plate 107 are fixedly connected to the front side face and the rear side face of the inner end of the purification tank 105 respectively; activated carbon 4 is added to the purification tank 105 located above the guide plate 106 and the intercepting mesh plate 107; a mounting notch a102 is provided at the four edge angles of the bottom end face of the purification body 1, and a mounting hole a104 penetrating the top face of the purification body 1 is provided at the top end face of the four mounting notches a102; an intercepting body 2 with a square block structure is provided above the purification body 1, and a stud 204 is fixedly connected to each of the four edge angles of the bottom end face and the top end face of the intercepting body 2 , and each stud 204 is threadedly installed with a nut 205; the four studs 204 located on the lower side are respectively plugged into the four installation holes a104, and are locked and fixed by nuts 205; a closed body 3 with a square block structure is provided above the intercepting body 2, and a mounting groove b301 is opened at the four edge angles of the top surface of the closed body 3, and a mounting hole b306 that passes through the bottom end surface of the closed body 3 is opened on the inner end bottom surface of the four installation grooves b301; the four studs 204 located on the upper side are respectively plugged into the four installation holes b306, and are locked and fixed by nuts 205.

[0036] In the embodiment of the present invention, a mounting cavity 2012 is provided at the center of the interior of the intercepting body 2, and a group of motors 206 are fixedly installed on the top surface of the inner end of the mounting cavity 2012; a driving disk 207 is provided above the intercepting body 2, and the rotating shaft end of the motor 206 passes through the top surface of the intercepting body 2 and is fixedly installed and connected to the axial center of the driving disk 207; a filter screen 208 with an annular screen structure is fixedly installed on the outer peripheral surface of the driving disk 207; a control box 201 is installed on the front end surface of the intercepting body 2, and the control box 201 is electrically connected to the motor 206; the top surface of the intercepting body 2 is an annular array There are a total of six support members 2011 embedded and rotatably installed in a row, and the support members 2011 are steel balls; the support members 2011 are located at the edge of the adjacent filter screen plate 208; the support members 2011 are in contact with the bottom end surface of the filter screen plate 208, and the filter screen plate 208 can be supported by the support members 2011 to prevent the fertilizer wastewater from contacting the filter screen plate 208 and causing impact deformation on one side thereof, and the support members 2011 are also a rotatable structure, so when the filter screen plate 208 rotates, the support members 2011 can also rotate in coordination, and it will not affect the rotation operation of the filter screen plate 208.

[0037] In the embodiment of the present invention, a guide groove 2010 with a circular groove structure is opened on the left side of the top end surface of the intercepting body 2, and the guide groove 2010 is located below the filter screen plate 208; a converging discharge opening 209 connected to the guide groove 2010 is opened on the left side of the bottom end surface of the intercepting body 2, the top of the converging discharge opening 209 is a circular structure, and its diameter is consistent with the diameter of the guide groove 2010, the bottom of the converging discharge opening 209 is a rectangular structure, the length of the converging discharge opening 209 is consistent with the side length of the purification tank 105, and the left edge of the bottom opening end of the converging discharge opening 209 coincides with the left edge of the top opening end of the purification tank 105.

[0038] In the embodiment of the present invention, a matching groove 307 with a circular groove structure is provided on the bottom end surface of the closed body 3, and the diameter of the matching groove 307 is larger than the outer diameter of the filter screen plate 208; the top surface of the inner end of the filter screen plate 208 does not contact the top surface of the filter screen plate 208; a wastewater conveying pipe 302 is fixedly installed on the left side of the top surface of the closed body 3 relative to the axial part of the guide groove 2010, and a wastewater conveying hole 303 penetrating the matching groove 307 is provided on the axial part of the wastewater conveying pipe 302, and the diameter of the wastewater conveying hole 303 is smaller than the diameter of the guide groove 2010; an impurity conveying hole 303 is fixedly installed on the right side of the top surface of the closed body 3 An extraction pipe 304, an impurity extraction hole 305 penetrating the matching groove 307 is provided at the axial center of the impurity extraction pipe 304, the impurity extraction hole 305 corresponds to the position of the filter screen plate 208, and the impurity extraction pipe 304 is connected to the pipe installation based on negative pressure extraction; an airflow input pipe 202 is fixedly installed on the right end face of the intercepting body 2, and an airflow conveying hole 203 connected to the top end face of the intercepting body 2 is provided at the axial center of the airflow input pipe 202, the airflow conveying hole 203 is coaxially arranged with the impurity extraction hole 305, and the airflow input pipe 202 is connected to the pipe installation based on airflow input.

[0039] The working principle of this embodiment:

[0040] When the fertilizer wastewater is treated, the fertilizer wastewater is uniformly transported into the matching groove 307 through the wastewater transport hole 303 through the fertilizer wastewater transport pipe installed and connected to the wastewater transport pipe 302, and the fertilizer wastewater transported into the matching groove 307 will contact the filter screen 208, so that the solid impurities in the fertilizer wastewater are intercepted and filtered through the filter screen 208, and the fertilizer wastewater intercepted and filtered by the filter screen 208 will fall through the mesh of the filter screen 208 to the inside of the guide groove 2010 corresponding to the coaxial center of the wastewater transport hole 303; further, when the fertilizer wastewater is treated, the motor 206 is controlled to start by the control box 201, and the shaft end of the motor 206 drives the driving disk 207 and the filter screen 208 to rotate at a uniform speed, so as to cooperate with the fertilizer wastewater uniformly transported into the matching groove 307, and the uniform speed of the filter screen 208 is passed through the filter screen 208. Rotation ensures that the fertilizer wastewater uniformly transported into the matching groove 307 will not only touch the same position of the filter screen plate 208, and when the filter screen plate 208 rotates to the top open end of the airflow delivery hole 203, the airflow is discharged through the top open end of the airflow input pipe 202, which will blow the solid impurities intercepted on the filter screen plate 208 and blow them away from the filter screen plate 208. At this time, the impurity extraction hole 305 corresponding to the coaxial center of the top open end of the airflow input pipe 202 will generate negative pressure, thereby achieving matching extraction of the solid impurities blown away from the filter screen plate 208, thereby extracting all the solid impurities intercepted on the filter screen plate 208, ensuring that when the area of ​​the filter screen plate 208 is subsequently rotated to the wastewater delivery hole 303, there is no solid impurity residue blocking its mesh, thereby ensuring that it can play its due filtering and interception role;

[0041] When the fertilizer wastewater after filtration and interception enters the guide groove 2010, it will be discharged along the convergence discharge opening 209 connected to the guide groove 2010, and based on the coordinated guidance of the convergence discharge opening 209 structure, the fertilizer wastewater will cooperate to flow into the purification tank 105 along the bottom open end of the convergence discharge opening 209, and the fertilizer wastewater flowing into the purification tank 105 will first contact the activated carbon 4, and be purified and filtered by the activated carbon 4, and also intercepted and guided by the guide plate 106, so that the fertilizer wastewater needs to flow to the lower right along the guide plate 106, and it will achieve all-round contact with the activated carbon 4 during the flow process, so that on the basis of ensuring the utilization rate of the activated carbon 4, the contact time between the fertilizer wastewater and the activated carbon 4 is increased to maximize the purification quality of the fertilizer wastewater;

[0042] When the fertilizer wastewater flows to the lower right along the guide plate 106 to the interception mesh plate 107, the purified fertilizer wastewater will penetrate through the interception mesh plate 107 and flow into the purification tank 105 below the guide plate 106. When the fertilizer wastewater after filtration, interception and purification is discharged, it is guided by the structure of the convergence tank 108 so that the fertilizer wastewater in the purification tank 105 converges to the top open end of the discharge pipe 103 and is discharged from the discharge pipe 103, thereby completing the multi-stage treatment of the fertilizer wastewater and ensuring that the discharged fertilizer wastewater meets the discharge standards.

[0043] In this article, there are a few points to note:

[0044] 1. The drawings of the embodiments of the present disclosure only involve structures related to the embodiments of the present disclosure, and other structures may refer to general designs.

[0045] 2. In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0046] The above are only specific implementation methods of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be covered by the protection scope of the present disclosure.

Claims

1. A multi-stage fertilizer wastewater treatment device, characterized in that: include: A purification body (1), the purification body (1) being a square block structure, the top surface of the purification body (1) being provided with a purification groove (105) being a square groove structure; the bottom surface of the inner end of the purification groove (105) being provided with a convergence groove (108), the top of the convergence groove (108) being a square structure, the side length of which is consistent with the side length of the purification groove (105), and the bottom of the purification groove (105) being a circular structure; a supporting frame (101) being a square frame structure is fixedly mounted on the bottom surface of the purification body (1); a discharge pipe (103) being connected to the convergence groove (108) is mounted on the bottom surface of the purification body (1), and a valve is mounted on the discharge pipe (103); the discharge pipe (103) is connected to the bottom position of the circular structure in the purification groove (105); the purification groove (105 ) is fixedly mounted on the left side of the inner end of the purification tank (105), the guide plate (106) being arranged in an inclined shape with the left side higher and the right side lower, the front end face and the rear end face of the guide plate (106) being respectively fixedly connected to the front side face and the rear side face of the inner end of the purification tank (105), and the right end face of the guide plate (106) not being in contact with the right side face of the inner end of the purification tank (105); the right end face of the guide plate (106) and the right side face of the inner end of the purification tank (105) are fixedly connected via an intercepting mesh plate (107), the intercepting mesh plate (107) and the guide plate (106) being arranged coplanar, and the front end face and the rear end face of the intercepting mesh plate (107) being respectively fixedly connected to the front side face and the rear side face of the inner end of the purification tank (105); activated carbon (4) is added to the purification tank (105) located above the guide plate (106) and the intercepting mesh plate (107).

2. A multi-stage fertilizer wastewater treatment device according to claim 1, characterized in that: The bottom end surface of the purification body (1) is provided with a mounting notch a (102) at four edge angles, and the inner end top surfaces of the four mounting notches a (102) are provided with a mounting hole a (104) penetrating the top end surface of the purification body (1); an interception body (2) having a square block structure is provided above the purification body (1), and four adjacent edge angles of the bottom end surface and the top end surface of the interception body (2) are each fixedly connected with a stud (204), and a nut (205) is threadedly installed on each stud (204); the four studs (204) located on the lower side are respectively plugged into the four mounting holes a (104) and are locked and fixed via the nuts (205).

3. A multi-stage fertilizer wastewater treatment device according to claim 2, characterized in that: A closed body (3) having a square block structure is provided above the intercepting body (2); a mounting notch b (301) is provided at each of the four edge angles of the top surface of the closed body (3); a mounting hole b (306) penetrating the bottom surface of the closed body (3) is provided at each of the inner bottom surfaces of the four mounting notches b (301); four studs (204) located on the upper side are respectively plugged into the four mounting holes b (306) and are locked and fixed by nuts (205).

4. A multi-stage fertilizer wastewater treatment device according to claim 3, characterized in that: An installation cavity (2012) is provided at the central portion of the interior of the interception body (2), and a group of motors (206) are fixedly mounted on the top surface of the inner end of the installation cavity (2012); a drive disk (207) is provided above the interception body (2), and the rotating shaft end of the motor (206) passes through the top surface of the interception body (2) and is fixedly mounted and connected to the axial center of the drive disk (207); a filter screen (208) in the form of an annular screen structure is fixedly mounted on the outer peripheral surface of the drive disk (207); a control box (201) is mounted on the front end surface of the interception body (2), and the control box (201) is electrically connected to the motor (206).

5. A multi-stage fertilizer wastewater treatment device according to claim 4, characterized in that: The top end surface of the interception body (2) is in the shape of a ring array and has six support members (2011) rotatably mounted therein, the support members (2011) being steel balls; the support members (2011) are located at the edge of an adjacent filter screen plate (208); and the support members (2011) are in contact with the bottom end surface of the filter screen plate (208).

6. A multi-stage fertilizer wastewater treatment device according to claim 5, characterized in that: A guide groove (2010) having a circular groove structure is provided on the left side of the top end surface of the intercepting body (2), and the guide groove (2010) is located below the filter screen plate (208); a converging discharge opening (209) connected to the guide groove (2010) is provided on the left side of the bottom end surface of the intercepting body (2); the top of the converging discharge opening (209) is a circular structure, and its diameter is consistent with the diameter of the guide groove (2010); the bottom of the converging discharge opening (209) is a rectangular structure, and the length of the converging discharge opening (209) is consistent with the side length of the purification tank (105); the left edge of the bottom opening end of the converging discharge opening (209) coincides with the left edge of the top opening end of the purification tank (105).

7. A multi-stage fertilizer wastewater treatment device according to claim 6, characterized in that: The bottom end surface of the closed body (3) is provided with a matching groove (307) in the form of a circular groove structure, the diameter of the matching groove (307) being larger than the outer diameter of the filter screen plate (208); the top surface of the inner end of the filter screen plate (208) is not in contact with the top end surface of the filter screen plate (208); a wastewater conveying pipe (302) is fixedly mounted on the left side of the top end surface of the closed body (3) relative to the axial center of the guide groove (2010), and the axial center of the wastewater conveying pipe (302) is provided with a wastewater conveying hole (303) penetrating the matching groove (307), the diameter of the wastewater conveying hole (303) being smaller than the diameter of the guide groove (2010).

8. A multi-stage fertilizer wastewater treatment device according to claim 7, characterized in that: An impurity extraction pipe (304) is fixedly mounted on the right side of the top end surface of the closed body (3), an impurity extraction hole (305) penetrating the matching groove (307) is opened at the axial center of the impurity extraction pipe (304), the impurity extraction hole (305) corresponds to the position of the filter screen (208), and the impurity extraction pipe (304) is connected to the pipe installation based on negative pressure extraction; an airflow input pipe (202) is fixedly mounted on the right end surface of the interception body (2), an airflow delivery hole (203) connected to the top end surface of the interception body (2) is opened at the axial center of the airflow input pipe (202), the airflow delivery hole (203) and the impurity extraction hole (305) are coaxially arranged, and the airflow input pipe (202) is connected to the pipe installation based on airflow input.

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