A sewage circulation purification treatment device and method for water conservancy projects

Abstract

The present invention relates to the field of sewage treatment, and particularly to a sewage circulation purification treatment device and method for water conservancy projects. It includes a purification treatment tank, a multi-layer filtration component, a telescopic spraying component, and a purification treatment component. The purification treatment tank separates a primary purification chamber and a secondary purification chamber; the multi-layer filtration component is arranged in the primary purification chamber to perform multi-layer filtration on the sewage of water conservancy projects; the telescopic spraying component is located in the secondary purification chamber and sprays a precipitation reagent downward through a communicating liquid storage cylinder; the purification treatment component is located below the telescopic spraying component. During the process of the telescopic spraying component lifting and driving the purification treatment component to lift synchronously, the purification treatment component, on the one hand, mixes the sewage and the precipitation reagent, and on the other hand, presses down the precipitate to below the water outlet pipe. The purification treatment of the present invention can be carried out cyclically, and the purification treatment methods are diverse, with simple and efficient operation. Each round of purification can achieve layer-by-layer separation of oil stains, suspended solids, and precipitates, with good purification effects, which is conducive to realizing the environmental protection construction of water conservancy projects.

Description

Technical Field

[0001] The present invention relates to the field of sewage treatment, and in particular to a sewage circulation purification treatment device and method for water conservancy projects. Background Art

[0002] Sewage will be generated during the construction of water conservancy projects. The main types of sewage are as follows:

[0003] Foundation pit drainage: Primarily contains suspended solids (SS), and the water quality is generally alkaline. The suspended solids content is related to the geological conditions of the construction area. For example, SS concentrations may be higher in limestone areas, while relatively lower in granite areas.

[0004] Sand and gravel washing wastewater: Wastewater generated during sand and gravel processing contains a large amount of suspended solids, the main component of which is inorganic sand particles that are very easy to settle. Its pollutant concentration is high and requires treatment before discharge.

[0005] Alkaline wastewater: Certain construction activities in water conservancy projects may generate alkaline wastewater, such as concrete mixing. This type of wastewater has a high pH value and requires neutralization treatment.

[0006] Oily wastewater: mainly comes from construction activities such as machinery maintenance and vehicle washing.

[0007] In summary, construction wastewater from water conservancy projects needs to be properly treated before it can be discharged or reused to protect the environment and human health. The Chinese patent document with authorization announcement number CN215516958U discloses a sewage purification device for water conservancy construction, including a mounting plate, a sedimentation tank, a support frame, a support seat, an agitation mechanism, a sewage pipe and a feeding mechanism. The upper surface of the mounting plate at the left position in the middle of the mounting plate is fixedly connected to the sedimentation tank, the side surface of the upper end of the sedimentation tank is connected to the water inlet pipe, the support seat is fixedly connected to the upper surface of the mounting plate corresponding to the middle position of the lower end of the sedimentation tank, the support frame is fixedly connected to the upper surface of the right end of the mounting plate, the upper end of the support frame is provided with a connecting plane, the support frame is provided with a feeding mechanism, the agitation mechanism includes a motor, a rotating shaft, a stirring rod, a storage box and a sieve plate, the motor is fixedly connected to the upper end of the sedimentation tank, and the lower end of the rotating shaft is rotatably connected to the upper end of the support seat.

[0008] The aforementioned wastewater purification technologies have the following drawbacks: They use chemical reagents to treat wastewater, which then settles and is then discharged. This means that the purification method relies primarily on chemical reagents. Due to the lack of pre-treatment for oil and suspended solids in the wastewater, water conservancy project wastewater contains a high concentration of impurities, resulting in low purification efficiency. The entire wastewater treatment process is short and involves few steps, which cannot guarantee effective purification. Sedimentation must be mixed with the wastewater when it is discharged, which not only results in incomplete discharge but also poses a risk of environmental pollution. Summary of the Invention

[0009] In view of the problems existing in the background technology, a sewage circulation purification treatment device and method for water conservancy projects are proposed. The purification treatment can be carried out cyclically, and the purification treatment methods are diverse, with simple and efficient operation. Each round of purification can achieve layer-by-layer separation of oil stains, suspended substances, and precipitates, with good purification effects, which is conducive to realizing the environmental protection construction of water conservancy projects.

[0010] The present invention proposes a sewage circulation purification treatment device for water conservancy projects, including a purification treatment tank, a multi-layer filtering component, a telescopic spraying component, and a purification treatment component. The interior of the purification treatment tank is divided into a first-level purification chamber and a second-level purification chamber with interconnected tops. A liquid storage cylinder is arranged outside the purification treatment tank; the water inlet pipe is connected to the bottom of the first-level purification chamber; the water outlet pipe is connected to the second-level purification chamber; the water inlet pipe and the water outlet pipe are connected to circulate and purify sewage; the multi-layer filtering component is arranged in the first-level purification chamber and above the water inlet pipe to filter the sewage of water conservancy projects through multi-layer filtering; the telescopic spraying component is located in the second-level purification chamber, driven by a cylinder to lift and lower, and sprays a precipitation reagent downward through the connection with the liquid storage cylinder to promote the precipitation of the sewage of water conservancy projects; the purification treatment component is located below the telescopic spraying component. During the process of the telescopic spraying component lifting and driving the purification treatment component to lift and lower synchronously, the purification treatment component mixes the sewage and the precipitation reagent on the one hand, and presses down the precipitate below the water outlet pipe on the other hand.

[0011] Preferably, the multi-layer filtering component includes three filtering plates; the filtering plates are sequentially arranged from bottom to top as a metal filter mesh layer, an activated carbon filter mesh layer, and a ceramic filter mesh layer, and each filtering plate is inclined and spaced; a slag discharge pipe is arranged on the purification treatment tank at the low end of the filtering plate.

[0012] Preferably, the multi-layer filtering component further includes a cleaning part penetrating through the three filtering plates; the cleaning part includes a rotating shaft penetrating through the three filtering plates; a cleaning frame is arranged on the side wall of the rotating shaft; the cleaning frame is slidably connected to the filtering area of the filtering plate.

[0013] Preferably, the telescopic spraying component includes a telescopic pipe located at the top of the second-level purification chamber; the upper end of the telescopic pipe is connected to the liquid storage cylinder through a pressure pump and a pipeline, and the lower end is connected to a lifting frame; the lifting frame is lifted and lowered through a connecting cylinder, and a spraying seat and an electric control telescopic rod are arranged at the lower end of the lifting frame; the spraying seat is connected to the telescopic pipe; the purification treatment component is installed on the telescopic end of the electric control telescopic rod and is opposite to the spraying seat in position.

[0014] Preferably, the purification treatment component includes an annular fixing frame connected to the electric control telescopic rod and having a through hole one, a mixing part reversely arranged in the annular fixing frame, and an annular flow-through frame coaxially and rotatably arranged at the bottom of the annular fixing frame and having a through hole two.

[0015] Preferably, the mixing member includes a turning disc rotatably arranged inside the inner ring of the annular fixing frame; sealing sheets are arranged at both ends of the turning disc; an airbag ring that is inflated and deflated by an air pump is arranged on the outer periphery of the sealing sheet; a sealing groove opposite to the position of the airbag ring is arranged on the inner ring wall of the annular fixing frame.

[0016] Preferably, multiple groups of through holes II are arranged on the annular circulation frame, including hollow liquid leakage holes, downward pressing holes with filters, and sealed holes; by rotating the annular circulation frame, the liquid leakage holes, downward pressing holes or sealed holes are switched to communicate with through hole I to perform function switching of mixing, downward pressing, and separating precipitation.

[0017] Preferably, the circulation pump connects the water inlet pipe and the water outlet pipe to circulate and purify the sewage.

[0018] Preferably, the connecting pipe and the water extraction pump connect the primary purification chamber and the secondary purification chamber, and the connecting pipe is located above the multi-layer filtering assembly.

[0019] The present invention further provides a sewage circulation purification method for water conservancy projects, which uses the above-mentioned sewage circulation purification treatment device for water conservancy projects, and the steps are as follows:

[0020] S1. The sewage of the water conservancy project enters the primary purification chamber from the water inlet pipe;

[0021] S2. After the sewage passes through the metal filter layer, activated carbon filter layer, and ceramic filter layer in sequence, it then enters the secondary purification chamber;

[0022] S3. By lifting and lowering the lifting frame, the telescopic pipe is driven to expand and contract to supply liquid; the precipitant is sprayed downward through the spray seat and enters the sewage;

[0023] S4. The annular circulation frame rotates, and the liquid leakage hole communicates with through hole I, and the sewage and the precipitant are pressurized and pass through the liquid leakage hole and through hole I; the turning disc rotates synchronously during the lifting process to mix the sewage and the precipitant;

[0024] S5. After mixing is completed, the turning disc is adjusted to be horizontal to seal the inner ring of the annular fixing frame; the air pump inflates the airbag ring to make it bulge and fit the sealing groove to form a sealed downward pressing plane; the downward pressing hole communicates with through hole I, the downward pressing plane descends, and the excess water leaks out from the downward pressing hole and through hole I, and the filter screen intercepts the precipitate;

[0025] S6. When the precipitate is squeezed, the sealed hole communicates with through hole I to further form a seal, and the precipitate is discharged from the bottom;

[0026] S7. The sewage returns to the primary purification chamber and enters the filtration treatment and precipitation treatment again.

[0027] Compared with the prior art, the present invention has the following beneficial technical effects: The first-level purification chamber and the second-level purification chamber are combined. A multi-layer filtration component is arranged in the first-level purification chamber. The sewage is filtered successively through the metal filter screen layer, the activated carbon filter screen layer, and the ceramic filter screen layer to remove the suspended matter and oil stains in the sewage of the water conservancy project. Then, a telescopic spraying component and a purification treatment component are arranged in the second-level purification chamber in cooperation. Through the lifting of the lifting frame, the purification treatment component is lifted synchronously. Through the rotation of the annular circulation frame, the liquid leakage hole, the downward pressure hole with a filter screen, and the sealed hole of the seal are successively communicated with the first through hole. The precipitant is sprayed downward through the spraying seat to purify the sewage. Through the rotation of the turning disk, the sewage and the precipitant are mixed. Through the turning disk sealing the inner ring of the annular fixing frame, a sealed downward pressure plane is formed to press down the precipitate, and finally the precipitate is extruded and discharged to complete the primary purification treatment of the sewage. The purification treatment can be carried out cyclically, and the purification treatment methods are diverse, with simple and efficient operation. Each round of purification can achieve the layer-by-layer separation of oil stains, suspended matter, and precipitate, with good purification effect, which is conducive to realizing the environmental protection construction of water conservancy projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 FIG. is a schematic structural diagram (view angle one) of the sewage circulating purification treatment device for water conservancy projects in the present invention;

[0029] Figure 2 FIG. is a schematic structural diagram (view angle two) of the sewage circulating purification treatment device for water conservancy projects in the present invention;

[0030] Figure 3 FIG. is a cross-sectional view of the sewage circulating purification treatment device for water conservancy projects in the present invention;

[0031] Figure 4 FIG. is a schematic structural diagram of the multi-layer filtration component in the present invention;

[0032] Figure 5 FIG. is a schematic combined structural diagram (view angle one) of the telescopic spraying component and the purification treatment component in the present invention;

[0033] Figure 6 FIG. is a schematic combined structural diagram (view angle two) of the telescopic spraying component and the purification treatment component in the present invention;

[0034] Figure 7 FIG. is a cross-sectional view of the purification treatment component in the present invention;

[0035] Figure 8 FIG. is a schematic structural diagram of the mixing part in the present invention;

[0036] Figure 9 is Figure 7 the enlarged view at A in

[0037] Figure 10 FIG. is a schematic structural diagram of the annular circulation frame in the present invention;

[0038] Figure 11 For Figure 10 The enlarged view at position B in the middle.

[0039] Reference numerals: 1, purification treatment tank; 101, primary purification chamber; 102, secondary purification chamber; 103, slag discharge pipe; 2, water inlet pipe; 3, water outlet pipe; 4, circulation pump; 5, multi-layer filtration assembly; 501, filter plate; 503, rotating shaft; 504, cleaning rack; 505, gear one; 506, gear two; 507, adjusting rod; 6, connecting pipe; 7, telescopic spraying assembly; 701, telescopic pipe; 702, lifting rack; 703, electric control telescopic rod; 704, spraying seat; 8, purification treatment assembly; 801, annular fixing rack; 80101, through hole one; 80102, sealing groove; 802, annular circulation rack; 80201, liquid leakage hole; 80202, sealing hole; 80203, downward pressure hole; 80204, circular track; 80205, driving wheel; 803, mixing part; 80301, flipping disc; 80302, sealing piece; 80303, airbag ring; 80304, air pump; 9, liquid storage cylinder; 10, cylinder; 11, pressure pump; 12, pipeline. Specific implementation manners

[0040] In the first embodiment, as Figures 1 - 3 shown, a sewage circulation purification treatment device for water conservancy projects proposed by the present invention includes a purification treatment tank 1, a multi-layer filtration assembly 5, a telescopic spraying assembly 7, and a purification treatment assembly 8. The interior of the purification treatment tank 1 is divided into a primary purification chamber 101 and a secondary purification chamber 102 that communicate with each other at the top. A liquid storage cylinder 9 is arranged outside the purification treatment tank 1; the water inlet pipe 2 communicates with the bottom of the primary purification chamber 101; the water outlet pipe 3 communicates with the secondary purification chamber 102; the water inlet pipe 2 and the water outlet pipe 3 are connected to circulate and purify sewage; the multi-layer filtration assembly 5 is arranged in the primary purification chamber 101 and above the water inlet pipe 2 to filter water conservancy project sewage through multi-layer filtration; the telescopic spraying assembly 7 is located in the secondary purification chamber 102, driven by a cylinder 10 to lift and lower, and sprays a precipitation reagent downward by communicating with the liquid storage cylinder 9 to promote the precipitation of water conservancy project sewage; the purification treatment assembly 8 is located below the telescopic spraying assembly 7. During the process of the telescopic spraying assembly 7 lifting and lowering to drive the purification treatment assembly 8 to lift and lower synchronously, the purification treatment assembly 8 mixes sewage and the precipitation reagent on the one hand, and presses down the precipitate below the water outlet pipe 3 on the other hand.

[0041] As Figure 4 shown, the multi-layer filtration assembly 5 includes three filter plates 501; the filter plates 501 are sequentially arranged from bottom to top as a metal filter mesh layer, an activated carbon filter mesh layer, and a ceramic filter mesh layer, and each filter plate 501 is inclined and spaced; a slag discharge pipe 103 is arranged on the purification treatment tank 1 at the lower end of the filter plate 501.

[0042] By setting the filter plate 501 with different filtering methods, the oil stains and suspended solids in the sewage of the water conservancy project are adsorbed and filtered. The filter residue accumulates along the inclined surface at the low end of the filter plate 501, and the slag discharge pipe 103 can be opened for cleaning.

[0043] It should be further noted that the multi-layer filter assembly 5 further includes a cleaning member penetrating through the three-layer filter plate 501; the cleaning member includes a rotating shaft 503 penetrating through the three-layer filter plate 501; a cleaning frame 504 is arranged on the side wall of the rotating shaft 503; the cleaning frame 504 is slidably connected to the filtering area of the filter plate 501.

[0044] It should be further noted that a first gear 505 is arranged at the end of the rotating shaft 503; a second gear 506 is meshed with the first gear 505 and is connected to the adjusting rod 507 at the same time; the adjusting rod 507 rotates through the purification treatment tank 1 and is connected to an external handle.

[0045] After working for a period of time, the staff rotates the handle, the second gear 506 meshes with the first gear 505, driving the rotating shaft 503 to rotate. The cleaning frame 504 slides synchronously to clean the filtering area of the filter plate 501.

[0046] As Figures 5 - 6 shown, the telescopic spraying assembly 7 includes a telescopic pipe 701 located at the top of the secondary purification chamber 102; the upper end of the telescopic pipe 701 is connected to the liquid storage cylinder 9 through a pressure pump 11 and a pipeline 12, and the lower end is connected to a lifting frame 702; the lifting frame 702 is lifted and lowered through a connecting cylinder 10, and a spraying seat 704 and an electric control telescopic rod 703 are arranged at the lower end of the lifting frame 702; the spraying seat 704 is communicated with the telescopic pipe 701; the purification treatment assembly 8 is installed on the telescopic end of the electric control telescopic rod 703 and is opposite to the spraying seat 704 in position.

[0047] The precipitants used for the purification treatment of the sewage of the water conservancy project include inorganic flocculants and organic flocculants. The inorganic flocculants mainly include calcium chloride, magnesium chloride, iron salts, aluminum salts, etc. The organic flocculants are mainly high molecular polymers. Specific selection is made according to the types of sewage in the water conservancy project. After the sewage passes through the layers of filtration in the primary purification chamber 101, it enters the secondary purification chamber 102. By lifting and lowering the lifting frame 702, the telescopic pipe 701 is driven to expand and contract for liquid supply. The precipitant is directly sprayed on the purification treatment assembly 8 through the spraying seat 704, and in cooperation with the purification treatment assembly, the mixing of the precipitant and the sewage is accelerated, and then the precipitation is directly pressed down.

[0048] As Figure 7 shown, the purification treatment assembly 8 includes an annular fixing frame 801 connected to the electric control telescopic rod 703 and having a first through hole 80101, a mixing member 803 reversely arranged in the annular fixing frame 801, and an annular flow-through frame 802 coaxially and rotatably arranged at the bottom of the annular fixing frame 801 and having a second through hole.

[0049] By rotating the annular fixing frame 801, the first through hole 80101 and the second through hole are connected or staggered. When connected, the mixed liquid is accelerated for mixing. When staggered, in cooperation with the rotation of the mixing member 803, the mixed liquid passes through the inside of the ring of the annular fixing frame 801 in a concentrated manner and is fully mixed. When staggered, further cooperating with the mixing member 803 to seal the annular fixing frame 801 can form a seal to intercept precipitation.

[0050] As Figure 8 shown, the mixing member 803 includes a turning disk 80301 rotatably arranged in the inner ring of the annular fixing frame 801; sealing sheets 80302 are arranged at both ends of the turning disk 80301; an airbag ring 80303 that is inflated and deflated by an air pump 80304 is arranged on the outer periphery of the sealing sheet 80302.

[0051] It should be further noted that, as Figure 9 shown, a sealing groove 80102 opposite to the position of the airbag ring 80303 is arranged on the inner wall of the ring of the annular fixing frame 801.

[0052] It should be further noted that a first motor is arranged on the annular fixing frame 801 and a third gear driven by the first motor to rotate; a fourth gear meshes with the third gear and is connected to the turning disk 80301 through a connecting rod to drive the turning disk 80301 to turn in the inner ring of the annular fixing frame 801.

[0053] When mixing the solution, the turning disk 80301 is driven to rotate by the first motor, and the turning process is the mixing process of the sewage and the precipitant. When pressing down the precipitation, the turning disk 80301 is adjusted to be horizontal to seal the inner ring of the annular fixing frame 801. The air pump 80304 inflates the airbag ring 80303 to make it bulge and fit the sealing groove 80102 to form a sealed pressing plane.

[0054] As Figure 10 shown, multiple groups of second through holes are arranged on the annular flow-through frame 802, including hollow liquid leakage holes 80201, pressing holes 80203 with filters, and sealed holes 80202 for sealing; by rotating the annular flow-through frame 802, the liquid leakage holes �0201, the pressing holes 80203, or the sealed holes 80202 are switched to be connected to the first through hole 80101 to perform function switching of mixing, pressing down, and separating precipitation.

[0055] It should be further noted that, as Figure 11 shown, a second motor is arranged on the annular fixing frame 801 and a pushing wheel 80205 driven by the second motor to rotate; a circular track 80204 is arranged on the annular flow-through frame 802; the pushing wheel 80205 rotates in the circular track 80204 to push the annular flow-through frame 802 to rotate around the origin.

[0056] When the annular circulation frame 802 rotates, the positions of the liquid leakage holes 80201, the sealing holes 80202, and the pressing holes 80203 can be switched. When the liquid leakage hole 80201 communicates with the first through hole 80101, sewage and the precipitant are pressurized and pass through the liquid leakage hole 80201 and the first through hole 80101 to accelerate mixing. When the pressing hole 80203 communicates with the first through hole 80101, the pressing plane presses down the precipitate, and the excess water leaks out from the pressing hole 80203 and the first through hole 80101, and the filter screen intercepts the precipitate, facilitating the filtration and collection of the precipitate. When the sealing hole 80202 communicates with the first through hole 80101, further sealing is formed, and the precipitate is discharged from the bottom.

[0057] It should be further noted that the circulating pump 4 connects the water inlet pipe 2 and the water outlet pipe 3 to circulate and purify the sewage; the sewage treated by the secondary purification chamber 102 returns from the water outlet pipe 3, the circulating pump 4, and the water inlet pipe 2 to the primary purification chamber 101 and enters the filtration treatment and precipitation treatment again. Through repeated circulation and purification, the sewage of the water conservancy project is thoroughly treated.

[0058] It should be further noted that the connecting pipe 6 and the water pump connect the primary purification chamber 101 and the secondary purification chamber 102, and the connecting pipe 6 is located above the multi-layer filter assembly 5.

[0059] Embodiment 2: Based on the sewage circulating purification treatment device for water conservancy projects in Embodiment 1, this embodiment proposes a sewage circulating purification method for water conservancy projects, and the steps are as follows:

[0060] S1. The sewage of the water conservancy project enters the primary purification chamber 101 from the water inlet pipe 2;

[0061] S2. After the sewage is filtered through the metal filter screen layer, the activated carbon filter screen layer, and the ceramic filter screen layer in sequence, it then enters the secondary purification chamber 102; after working for a period of time, the staff rotates the handle, the second gear 506 meshes with the first gear 505, driving the rotating shaft 503 to rotate; the cleaning frame 504 synchronously slides to clean the filtering area of the filter plate 501;

[0062] S3. The lifting frame 702 is lifted and lowered to drive the telescopic pipe 701 to expand and contract for liquid supply; the precipitant is sprayed downward through the spray seat 704 and enters the sewage;

[0063] S4. The annular circulation frame 802 rotates, and the liquid leakage hole 80201 communicates with the first through hole 80101, and sewage and the precipitant are pressurized and pass through the liquid leakage hole 80201 and the first through hole 80101; the flipping disc 80301 rotates synchronously during the lifting process to mix the sewage and the precipitant;

[0064] S5. After mixing is completed, the turning disc 80301 is adjusted to be horizontal to seal the inner ring of the annular fixing frame 801. The air pump 80304 inflates the airbag ring 80303 to make it bulge and fit the sealing groove 80102, forming a sealed downward pressing plane. The downward pressing hole 80203 is communicated with the first through hole 80101, and the downward pressing plane descends. Excess water leaks out from the downward pressing hole 80203 and the first through hole 80101, and the filter screen intercepts the sediment.

[0065] S6. When the sediment is extruded, the sealing hole 80202 is communicated with the first through hole 80101 to further form a seal, and the sediment is discharged from the bottom.

[0066] S7. The sewage returns to the primary purification chamber 101 and enters the filtration treatment and sedimentation treatment again.

[0067] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to this. Various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those skilled in the art to which the present invention pertains.

Claims

1. A sewage recycling and purification treatment device for water conservancy projects, characterized in that, Comprising: A purification treatment tank (1), the interior of the purification treatment tank (1) is partitioned into a first-stage purification chamber (101) and a second-stage purification chamber (102) with interconnected tops, and a liquid storage cylinder (9) is arranged outside the purification treatment tank (1); a water inlet pipe (2) is connected to the bottom of the first-stage purification chamber (101); a water outlet pipe (3) is connected to the second-stage purification chamber (102); the water inlet pipe (2) and the water outlet pipe (3) are connected to circulate and purify sewage. A multi-layer filtration component (5), the multi-layer filtration component (5) is arranged in the first-stage purification chamber (101) and above the water inlet pipe (2), and filters sewage from water conservancy projects through multi-layer filtration. A telescopic spraying component (7), the telescopic spraying component (7) is located in the second-stage purification chamber (102), is driven to lift and lower by a cylinder (10), and sprays a precipitation reagent downward by connecting to the liquid storage cylinder (9) to promote the precipitation of sewage from water conservancy projects. And a purification treatment component (8), the purification treatment component (8) is located below the telescopic spraying component (7). During the process of the telescopic spraying component (7) lifting and lowering and driving the purification treatment component (8) to lift and lower synchronously, on the one hand, the purification treatment component (8) mixes sewage and the precipitation reagent, and on the other hand, presses the precipitate below the water outlet pipe (3). The purification treatment component (8) includes an annular fixing frame (801) connected to an electric control telescopic rod (703) and having a through-hole one (80101), a mixing part (803) reversibly arranged in the annular fixing frame (801), and an annular flow-through frame (802) coaxially and rotatably arranged at the bottom of the annular fixing frame (801) and having a through-hole two. The mixing part (803) includes a flipping disc (80301) rotatably arranged in the inner ring of the annular fixing frame (801); sealing sheets (80302) are arranged at both ends of the flipping disc (80301); an airbag ring (80303) inflated and deflated by an air pump (80304) is arranged in a circle on the outer periphery of the sealing sheet (80302); a sealing groove (80102) opposite to the position of the airbag ring (80303) is arranged on the inner wall of the ring of the annular fixing frame (801). Multiple groups of through-hole twos are arranged on the annular flow-through frame (802), including hollow liquid leakage holes (80201), downward pressing holes (80203) with filters, and sealed holes (80202) with sealed mouths; by rotating the annular flow-through frame (802), the liquid leakage holes (80201), the downward pressing holes (80203), or the sealed holes (80202) are switched to communicate with the through-hole one (80101) to perform function switching of mixing, downward pressing, and separating precipitation.

2. The sewage recycling and purification treatment device for water conservancy projects according to claim 1, characterized in that, The multi-layer filtration component (5) includes three layers of filter plates (501); the filter plates (501) are sequentially arranged from bottom to top as a metal filter mesh layer, an activated carbon filter mesh layer, and a ceramic filter mesh layer, and each layer of filter plate (501) is inclined and spaced; a slag discharge pipe (103) is arranged on the purification treatment tank (1) at the low end of the filter plate (501).

3. The sewage circulation and purification treatment device for water conservancy projects according to claim 2, characterized in that, The multi-layer filtration component (5) further includes a cleaning part penetrating through the three layers of filter plates (501). The cleaning part includes a rotating shaft (503) that penetrates through three filter plates (501); a cleaning rack (504) is arranged on the side wall of the rotating shaft (503); the cleaning rack (504) is slidably connected to the filtering area of the filter plate (501).

4. The sewage circulation and purification treatment device for water conservancy projects according to claim 2, characterized in that, The telescopic spraying assembly (7) includes a telescopic pipe (701) located at the top of the secondary purification chamber (102); the upper end of the telescopic pipe (701) is connected to the liquid storage cylinder (9) through a pressure pump (11) and a pipeline (12), and the lower end is connected to a lifting rack (702); the lifting rack (702) is lifted and lowered by a connecting cylinder (10), and a spraying seat (704) and an electric control telescopic rod (703) are arranged at the lower end of the lifting rack (702); The spraying seat (704) is communicated with the telescopic pipe (701); The purification treatment assembly (8) is installed on the telescopic end of the electric control telescopic rod (703), and the position is opposite to the spraying seat (704).

5. The sewage recycling and purification treatment device for water conservancy projects according to claim 1, characterized in that, The circulation pump (4) is communicated with the water inlet pipe (2) and the water outlet pipe (3) to circulate and purify the sewage.

6. The sewage circulation purification treatment device for water conservancy projects according to claim 1, characterized in that, The connecting pipe (6) and the water extraction pump are communicated with the primary purification chamber (101) and the secondary purification chamber (102), and the connecting pipe (6) is located above the multi-layer filtering assembly (5).

7. A sewage recycling and purification method for water conservancy projects, characterized in that, Adopt the sewage circulation purification treatment device for water conservancy projects described in claim 6, and the steps are as follows: S1. The water conservancy project sewage enters the primary purification chamber (101) from the water inlet pipe (2); S2. After the sewage passes through the metal filter screen layer, the activated carbon filter screen layer, and the ceramic filter screen layer in sequence, it then enters the secondary purification chamber (102); S3. Through the lifting of the lifting rack (702), the telescopic pipe (701) is driven to expand and contract to supply liquid; the precipitant is sprayed downward through the spraying seat (704) and enters the sewage; S4. The annular circulation rack (802) rotates, and the liquid leakage holes (80201) are communicated with the through holes one (80101), and the sewage and the precipitant are pressurized and pass through the liquid leakage holes (80201) and the through holes one (80101); the turning disk (80301) rotates synchronously during the lifting process to mix the sewage and the precipitant; S5. After the mixing is completed, the turning disk (80301) is adjusted to be horizontal to seal the inner ring of the annular fixing frame (801); the air pump (80304) inflates the airbag ring (80303) to make it bulge and fit the sealing groove (80102) to form a sealed pressing plane; the pressing holes (80203) are communicated with the through holes one (80101), the pressing plane descends, and the excess water leaks out from the pressing holes (80203) and the through holes one (80101), and the filter screen intercepts the precipitate; S6. When the precipitate is squeezed, the sealing holes (80202) are communicated with the through holes one (80101) to further form a seal, and the precipitate is discharged from the bottom; S7. The sewage returns to the primary purification chamber (101) and enters the filtration treatment and precipitation treatment again.

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