Sewage circulation purification treatment device and method for water conservancy project

Abstract

The invention relates to the field of sewage treatment, in particular to a sewage circulation purification treatment device and method for a water conservancy project. The device comprises a purification treatment box, a multi-layer filtering assembly, a telescopic spraying assembly and a purification treatment assembly. The purification treatment box is divided into a primary purification chamber and a secondary purification chamber; the multi-layer filtering assembly is arranged in the first-stage purification chamber and is used for performing multi-layer filtering treatment on water conservancy project sewage; the telescopic spraying assembly is positioned in the secondary purification chamber and is communicated with the liquid storage cylinder to downwards spray a precipitation reagent; the purification treatment assembly is located below the telescopic spraying assembly, and in the process that the telescopic spraying assembly ascends and descends to drive the purification treatment assembly to ascend and descend synchronously, the purification treatment assembly mixes sewage and a precipitation reagent on one hand and presses precipitation to the position below the water outlet pipe on the other hand. The purification treatment can be circularly carried out, the purification treatment modes are diversified, and the operation is simple and efficient. Layer-by-layer separation of oil stains, suspended solids and precipitates can be realized in each round of purification, the purification effect is good, and the realization of environment-friendly construction of water conservancy projects is facilitated.

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: mainly contains suspended solids (SS), and its water quality is generally alkaline. The content of suspended solids is related to the geological conditions of the construction area. For example, the SS concentration in limestone areas may be higher, while that in granite areas is relatively lower.

[0004] Sand and gravel washing wastewater: The wastewater generated during the 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 needs to be treated before discharge.

[0005] Alkaline wastewater: Some construction activities in water conservancy projects may produce alkaline wastewater, such as concrete mixing, etc. This type of wastewater has a high pH value and needs to be neutralized.

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

[0007] In summary, construction wastewater of 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 the authorization announcement number CN215516958U discloses a sewage purification device for water conservancy construction, including a mounting plate, a settling tank, a support frame, a support seat, a stirring mechanism, a sewage pipe and a feeding mechanism, wherein the upper surface of the mounting plate at the middle left position is fixedly connected with the settling tank, the side surface of the upper end of the settling tank is connected with 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 settling 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 stirring mechanism comprises a motor, a rotating shaft, a stirring rod, a material storage box and a sieve plate, the motor is fixedly connected to the upper end of the settling tank, and the lower end of the rotating shaft is rotatably connected to the upper end of the support seat.

[0008] The above-mentioned sewage purification technology has the following shortcomings: chemical reagents are used to treat sewage, and the sediment is discharged after sedimentation. In other words, the purification method mainly relies on chemical reagents. Due to the lack of preliminary treatment of oil and suspended matter in sewage, the sewage from water conservancy projects contains many impurities, resulting in low purification efficiency. The entire sewage treatment process is short and has few links, which cannot guarantee the effect of purification. When the sediment is discharged, it needs to be mixed with sewage, which is not only easy to cause incomplete discharge, but also has the risk of polluting the environment. Summary of the invention

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

[0010] The present invention proposes a sewage circulation purification treatment device for water conservancy projects, comprising a purification treatment box, a multi-layer filter assembly, a telescopic spray assembly and a purification treatment assembly. The interior of the purification treatment box is divided into a primary purification chamber and a secondary purification chamber which are interconnected at the top, and a liquid storage cylinder is arranged outside the purification treatment box; the water inlet pipe is connected to the bottom of the primary purification chamber; the water outlet pipe is connected to the secondary purification chamber; the water inlet pipe and the water outlet pipe are connected to circulate and purify the sewage; the multi-layer filter assembly is arranged in the primary purification chamber and is located above the water inlet pipe, and the sewage of the water conservancy project is treated by multi-layer filtration; the telescopic spray assembly is located in the secondary purification chamber, and is driven to rise and fall by a cylinder, and sprays a precipitation agent downward through the connected liquid storage cylinder to promote the precipitation of the sewage of the water conservancy project; the purification treatment assembly is located below the telescopic spray assembly, and in the process of the telescopic spray assembly lifting and lowering to drive the purification treatment assembly to rise and fall synchronously, the purification treatment assembly mixes the sewage and the precipitation agent on the one hand, and presses the precipitation down to the bottom of the water outlet pipe on the other hand.

[0011] Preferably, the multi-layer filter assembly includes three layers of filter plates; the filter plates are arranged from bottom to top in sequence as a metal filter layer, an activated carbon filter layer, and a ceramic filter layer, and each layer of filter plates is inclined and arranged at intervals; a slag discharge pipe located at the lower end of the filter plate is provided on the purification treatment box.

[0012] Preferably, the multi-layer filter assembly also includes a cleaning member that penetrates the three layers of filter plates; the cleaning member includes a rotating shaft that rotates and penetrates the three layers of filter plates; a cleaning frame is arranged on the side wall of the rotating shaft; and the cleaning frame is slidably connected to the filter area of ​​the filter plate.

[0013] Preferably, the telescopic spray assembly includes a telescopic tube located at the top of the secondary purification chamber; the upper end of the telescopic tube 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 by connecting to a cylinder, and a spray seat and an electrically controlled telescopic rod are arranged at the lower end of the lifting frame; the spray seat is connected to the telescopic tube; the purification treatment assembly is installed on the telescopic end of the electrically controlled telescopic rod, and its position is opposite to the spray seat.

[0014] Preferably, the purification treatment component includes an annular fixing frame connected to the electric control telescopic rod and having a through hole 1, a mixing element flipped in the annular fixing frame, and an annular circulation frame coaxially rotatably arranged at the bottom of the annular fixing frame and having a through hole 2.

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

[0016] Preferably, multiple groups of through holes are arranged on the annular circulation rack, including hollow leakage holes, downward pressure holes with filters and sealed holes; by rotating the annular circulation rack, the leakage holes, downward pressure holes or sealing holes are switched to be connected with through hole one, and the functions of mixing, downward pressure and separation precipitation are switched.

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

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

[0019] The present invention further proposes a method for circulating and purifying sewage for water conservancy projects, using the above-mentioned sewage circulating and purifying treatment device for water conservancy projects, and the steps are as follows:

[0020] S1. Water conservancy project sewage enters the primary purification room from the water inlet pipe;

[0021] S2, sewage is filtered through the metal filter layer, activated carbon filter layer, and ceramic filter layer in turn, and then enters the secondary purification room;

[0022] S3, the lifting frame is lifted and lowered to drive the telescopic tube to extend and retract to supply liquid; the precipitant is sprayed downward through the spray seat into the sewage;

[0023] S4, the annular circulation rack rotates, the leakage hole is connected with the through hole 1, and the sewage and the precipitant are pressurized to pass through the leakage hole and the through hole 1; the turning plate rotates synchronously during the lifting process to mix the sewage and the precipitant;

[0024] S5. After the mixing is completed, the turning plate 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 pressure plane; the downward pressure hole is connected with the through hole 1, the downward pressure plane drops, and the excess water leaks out from the downward pressure hole and the through hole 1, and the filter screen intercepts the precipitation;

[0025] S6. When the precipitate is squeezed, the sealing hole is connected with the through hole, further forming a seal, and the precipitate is discharged from the bottom;

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

[0027] Compared with the prior art, the present invention has the following beneficial technical effects: a primary purification chamber and a secondary purification chamber are combined. A multi-layer filter assembly is arranged in the primary purification chamber, and the sewage is filtered in sequence through a metal filter layer, an activated carbon filter layer, and a ceramic filter layer to remove suspended matter and oil in the sewage of the water conservancy project. Then, a telescopic spray assembly and a purification treatment assembly are arranged in the secondary purification chamber, and the purification treatment assembly is lifted and lowered by the lifting frame, and the purification treatment assembly is lifted and lowered synchronously, and the ring-shaped circulation frame is rotated, and the leakage hole, the pressure hole with the filter screen, and the sealed hole are switched to connect the through hole one in sequence. The precipitant is sprayed downward by the spray seat to purify the sewage, and the sewage and the precipitant are mixed by rotating the flip plate, and the inner ring of the ring-shaped fixed frame is sealed by the flip plate to form a sealed downward pressure plane to press down the precipitation, and finally the precipitation is squeezed and discharged to complete the primary purification of the sewage. The purification treatment can be carried out cyclically, and the purification treatment methods are diverse, and the operation is simple and efficient. Each round of purification can achieve the separation of oil, suspended matter, and precipitation layer by layer, and the purification effect is good, which is conducive to the environmental protection construction of the water conservancy project. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the sewage circulation purification treatment device for water conservancy projects in the present invention (viewing angle 1);

[0029] Figure 2 It is a structural schematic diagram of the sewage circulation purification treatment device for water conservancy projects in the present invention (viewing angle 2);

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

[0031] Figure 4 It is a schematic diagram of the structure of the multi-layer filter assembly in the present invention;

[0032] Figure 5 Schematic diagram of the combined structure of the telescopic spray assembly and the purification treatment assembly in the present invention (viewing angle 1);

[0033] Figure 6 Schematic diagram of the combined structure of the telescopic spray assembly and the purification treatment assembly in the present invention (viewing angle 2);

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

[0035] Figure 8 It is a schematic diagram of the structure of the mixing element in the present invention;

[0036] Fig. 9 for Figure 7 Enlarged view of point A in the middle;

[0037] Fig.10 It is a schematic diagram of the structure of the annular circulation rack in the present invention;

[0038] Fig.11 for Fig.10 Enlarged view of point B in the middle.

[0039] Figure numerals: 1, purification treatment box; 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 filter assembly; 501, filter plate; 503, rotating shaft; 504, cleaning rack; 505, gear one; 506, gear two; 507, adjusting rod; 6, connecting pipe; 7, telescopic spray assembly; 701, telescopic pipe; 702, lifting frame; 703, electric telescopic rod; 704, spray seat; 8, purification Processing assembly; 801, annular fixing frame; 80101, through hole 1; 80102, sealing groove; 802, annular circulation frame; 80201, leakage hole; 80202, sealing hole; 80203, down-pressure hole; 80204, circular track; 80205, driving wheel; 803, mixing element; 80301, turning plate; 80302, sealing sheet; 80303, air bag ring; 80304, air pump; 9, liquid storage cylinder; 10, cylinder; 11, booster pump; 12, pipeline. DETAILED DESCRIPTION

[0040] Embodiment 1, as Figure 1-Figure 3 As shown, a sewage circulation purification treatment device for water conservancy projects proposed by the present invention comprises a purification treatment box 1, a multi-layer filter assembly 5, a telescopic spray assembly 7 and a purification treatment assembly 8. The interior of the purification treatment box 1 is divided into a primary purification chamber 101 and a secondary purification chamber 102 which are interconnected at the top, and a liquid storage cylinder 9 is arranged outside the purification treatment box 1; the water inlet pipe 2 is connected to the bottom of the primary purification chamber 101; the water outlet pipe 3 is connected to the secondary purification chamber 102; the water inlet pipe 2 and the water outlet pipe 3 are connected to circulate and purify the sewage; the multi-layer filter assembly 5 is arranged in the primary purification chamber 101 and is located above the water inlet pipe 2, and treats the sewage of the water conservancy project through multi-layer filtration; the telescopic spray assembly 7 is located in the secondary purification chamber 102, and is driven to rise and fall by the cylinder 10, and sprays the precipitation reagent downward through the connection with the liquid storage cylinder 9 to promote the precipitation of the sewage of the water conservancy project; the purification treatment assembly 8 is located below the telescopic spray assembly 7, and the telescopic spray assembly 7 rises and falls to drive the purification treatment assembly 8 to rise and fall synchronously, and the purification treatment assembly 8 mixes the sewage and the precipitation reagent on the one hand, and presses the precipitation to the bottom of the water outlet pipe 3 on the other hand.

[0041] like Figure 4 As shown, the multi-layer filter assembly 5 includes three layers of filter plates 501; the filter plates 501 are arranged from bottom to top as a metal filter layer, an activated carbon filter layer, and a ceramic filter layer, and each layer of filter plates 501 is inclined and arranged at intervals; the purification treatment box 1 is provided with a slag discharge pipe 103 located at the lower end of the filter plate 501.

[0042] By setting filter plates 501 with different filtering modes, oil and suspended solids in the sewage of water conservancy projects are adsorbed and filtered, and the filter residues are accumulated on the lower end of the filter plate 501 along the inclined surface, and can be cleaned by opening the residue discharge pipe 103.

[0043] It should be further explained that the multi-layer filter assembly 5 also includes a cleaning part that penetrates the three-layer filter plate 501; the cleaning part includes a rotating shaft 503 that rotates and penetrates the three-layer filter plate 501; a cleaning frame 504 is set on the side wall of the rotating shaft 503; the cleaning frame 504 is slidably connected to the filter area of ​​the filter plate 501.

[0044] It should be further explained that a gear 1 505 is disposed at the end of the rotating shaft 503; a gear 2 506 is meshedly connected to the gear 1 505 and is also connected to an adjustment rod 507; the adjustment rod 507 rotates to penetrate the purification treatment box 1 and is connected to an external handle.

[0045] After a period of work, the staff rotates the handle, and the gear 2 506 meshes with the gear 1 505, driving the rotating shaft 503 to rotate. The cleaning frame 504 cleans the filter area of ​​the filter plate 501 by synchronous sliding.

[0046] like Figure 5-Figure 6 As shown, the telescopic spray assembly 7 includes a telescopic tube 701 located at the top of the secondary purification chamber 102; the upper end of the telescopic tube 701 is connected to the liquid storage cylinder 9 through the pressure pump 11 and the pipeline 12, and the lower end is connected to the lifting frame 702; the lifting frame 702 is lifted and lowered by connecting the cylinder 10, and a spray seat 704 and an electrically controlled telescopic rod 703 are arranged at the lower end of the lifting frame 702; the spray seat 704 is connected to the telescopic tube 701; the purification treatment assembly 8 is installed on the telescopic end of the electrically controlled telescopic rod 703, and its position is opposite to the spray seat 704.

[0047] The precipitants used for the purification of water conservancy project sewage include inorganic flocculants and organic flocculants. Inorganic flocculants mainly include calcium chloride, magnesium chloride, iron salts, aluminum salts, etc. Organic flocculants are mainly high molecular polymers. The specific selection is based on the type of sewage from the water conservancy project. After being filtered layer by layer in the primary purification chamber 101, the sewage enters the secondary purification chamber 102. The lifting frame 702 is lifted and lowered, driving the telescopic tube 701 to extend and retract to supply liquid. The precipitant is directly sprayed on the purification treatment component 8 through the spray seat 704, and cooperates with the purification treatment component to accelerate the mixing of the precipitant and sewage, and then directly presses down for precipitation.

[0048] like Figure 7 As shown, the purification treatment component 8 includes an annular fixing frame 801 connected to the electric control telescopic rod 703 and having a through hole 1 80101, a mixing piece 803 flipped inside the annular fixing frame 801, and an annular circulation frame 802 coaxially rotatably arranged at the bottom of the annular fixing frame 801 and having a through hole 2.

[0049] The annular fixing frame 801 rotates, and the through hole 1 80101 and the through hole 2 are connected or staggered. When connected, the mixed liquid passes through to accelerate mixing. When staggered, the mixing element 803 rotates, and the mixed liquid passes through the ring of the annular fixing frame 801 and is fully mixed. When staggered, the mixing element 803 seals the annular fixing frame 801 to form a seal and intercept precipitation.

[0050] like Figure 8 As shown, the mixing element 803 includes a flip plate 80301 rotatably arranged on the inner ring of the annular fixing frame 801; sealing sheets 80302 are arranged at both ends of the flip plate 80301; and an air bag ring 80303 which is inflated and deflated by an air pump 80304 is arranged on the outer periphery of the sealing sheet 80302.

[0051] It needs to be further explained that if Fig. 9 As shown, a sealing groove 80102 is provided on the inner wall of the annular fixing frame 801 , which is opposite to the airbag ring 80303 .

[0052] It should be further explained that a motor 1 and a gear 3 driven to rotate by the motor 1 are arranged on the annular fixing frame 801; the gear 4 is meshed with the gear 3 and is connected to the flip disk 80301 through a connecting rod to drive the flip disk 80301 to flip in the inner ring of the annular fixing frame 801.

[0053] When the solution is mixed, the motor drives the flip plate 80301 to rotate, and the flipping process is the mixing process of the sewage and the precipitant. When the sedimentation is pressed down, the flip plate 80301 is adjusted to a horizontal level 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 downward pressure plane.

[0054] like Fig.10 As shown, multiple groups of through holes 2 are arranged on the annular circulation rack 802, including a hollow leakage hole 80201, a downward pressure hole 80203 with a filter and a sealed hole 80202; by rotating the annular circulation rack 802, the leakage hole 80201, the downward pressure hole 80203 or the sealed hole 80202 is switched to be connected with the through hole 1 80101, and the functions of mixing, downward pressure and separation of precipitation are switched.

[0055] It needs to be further explained that if Fig.11 As shown, the annular fixed frame 801 is provided with a motor 2 and a driving wheel 80205 driven to rotate by the motor 2; a circular track 80204 is provided on the annular circulation frame 802; the driving wheel 80205 drives the origin of the annular circulation frame 802 to rotate by rotating in the circular track 80204.

[0056] The annular circulation rack 802 rotates to switch the positions of the leakage hole 80201, the sealing hole 80202 and the lower pressure hole 80203. When the leakage hole 80201 is connected to the through hole 1 80101, the sewage and the precipitant are pressurized through the leakage hole 80201 and the through hole 1 80101 to accelerate the mixing. When the lower pressure hole 80203 is connected to the through hole 1 80101, the lower pressure plane presses down the precipitate, and the excess water leaks out from the lower pressure hole 80203 and the through hole 1 80101. The filter net intercepts the precipitate, which is convenient for filtering and collecting the precipitate. When the sealing hole 80202 is connected to the through hole 1 80101, a seal is further formed, and the precipitate is discharged from the bottom.

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

[0058] It should be further explained 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 recycling and purification treatment device for water conservancy projects in Embodiment 1, this embodiment proposes a sewage recycling and purification method for water conservancy projects, and the steps are as follows:

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

[0061] S2. The sewage is filtered through the metal filter layer, the activated carbon filter layer, and the ceramic filter layer in sequence, and then enters the secondary purification chamber 102. After a period of work, the staff turns the handle, and the gear 2 506 meshes with the gear 1 505, driving the rotating shaft 503 to rotate; the cleaning frame 504 cleans the filtering area of ​​the filter plate 501 by synchronous sliding;

[0062] S3, the lifting frame 702 is lifted and lowered to drive the telescopic tube 701 to extend and retract to supply liquid; the precipitant is sprayed downward through the spray seat 704 into the sewage;

[0063] S4, the annular circulation rack 802 rotates, the leakage hole 80201 is connected with the through hole 1 80101, and the sewage and the precipitant are pressurized to pass through the leakage hole 80201 and the through hole 1 80101; the turning plate 80301 rotates synchronously during the lifting process to mix the sewage and the precipitant;

[0064] S5. After the mixing is completed, the turning plate 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 downward pressure plane; the downward pressure hole 80203 is connected with the through hole 1 80101, the downward pressure plane descends, and the excess water leaks out from the downward pressure hole 80203 and the through hole 1 80101, and the filter screen intercepts the sediment;

[0065] S6. When the precipitate is squeezed, the sealing hole 80202 is connected with the through hole 1 80101, further forming a seal, and the precipitate is discharged from the bottom;

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

[0067] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A sewage circulation purification treatment device for water conservancy projects, characterized in that: include: A purification treatment box (1), wherein the interior of the purification treatment box (1) is divided into a primary purification chamber (101) and a secondary purification chamber (102) which are interconnected at the top, and a liquid storage cylinder (9) is arranged outside the purification treatment box (1); a water inlet pipe (2) is connected to the bottom of the primary purification chamber (101); a water outlet pipe (3) is connected to the secondary purification chamber (102); the water inlet pipe (2) and the water outlet pipe (3) are connected to circulate and purify sewage; A multi-layer filter assembly (5), the multi-layer filter assembly (5) is arranged in the primary purification chamber (101) and is located above the water inlet pipe (2), and processes the sewage of the water conservancy project through multi-layer filtration; A telescopic spray assembly (7), the telescopic spray assembly (7) is located in the secondary purification chamber (102), driven to rise and fall by a cylinder (10), and sprays a precipitation agent downwards through a connected liquid storage cylinder (9), thereby promoting the precipitation of sewage in a water conservancy project; And a purification treatment component (8), the purification treatment component (8) is located below the telescopic spray component (7), and in the process of the telescopic spray component (7) lifting and lowering to drive the purification treatment component (8) to rise and fall synchronously, the purification treatment component (8) mixes the sewage and the precipitation agent on the one hand, and presses the precipitation down to the bottom of the water outlet pipe (3) on the other hand.

2. The sewage circulation purification treatment device for water conservancy projects according to claim 1 is characterized in that: The multi-layer filter assembly (5) comprises three layers of filter plates (501); the filter plates (501) are arranged in sequence from bottom to top as a metal filter layer, an activated carbon filter layer, and a ceramic filter layer, and each layer of the filter plates (501) is inclined and arranged at intervals; and a slag discharge pipe (103) is arranged on the purification treatment box (1) at the lower end of the filter plate (501).

3. The sewage circulation purification treatment device for water conservancy projects according to claim 2 is characterized in that: The multi-layer filter assembly (5) further comprises a cleaning member penetrating through the three-layer filter plate (501); The cleaning member comprises a rotating shaft (503) that rotates and penetrates through the three-layer filter plate (501); a cleaning frame (504) is arranged on the side wall of the rotating shaft (503); and the cleaning frame (504) is slidably connected to the filter area of ​​the filter plate (501).

4. The sewage circulation purification treatment device for water conservancy projects according to claim 2 is characterized in that: The telescopic spray assembly (7) comprises a telescopic tube (701) located at the top of the secondary purification chamber (102); the upper end of the telescopic tube (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 by connecting to a cylinder (10), and a spray seat (704) and an electrically controlled telescopic rod (703) are arranged at the lower end of the lifting frame (702); The spray seat (704) is connected to the telescopic tube (701); The purification treatment component (8) is installed on the telescopic end of the electric control telescopic rod (703) and is located opposite to the spray seat (704).

5. The sewage circulation purification treatment device for water conservancy projects according to claim 4 is characterized in that: The purification treatment component (8) comprises an annular fixing frame (801) connected to an electrically controlled telescopic rod (703) and having a through hole 1 (80101), a mixing element (803) flipped inside the annular fixing frame (801), and an annular circulation frame (802) coaxially rotatably arranged at the bottom of the annular fixing frame (801) and having a through hole 2.

6. The sewage circulation purification treatment device for water conservancy projects according to claim 5 is characterized in that: The mixing element (803) comprises a flip plate (80301) rotatably arranged on the inner ring of the annular fixing frame (801); sealing sheets (80302) are arranged at both ends of the flip plate (80301); and an air bag ring (80303) is arranged on the outer periphery of the sealing sheet (80302) to be inflated and deflated by an air pump (80304); A sealing groove (80102) is provided on the inner wall of the annular fixing frame (801) and is opposite to the airbag ring (80303).

7. The sewage circulation purification treatment device for water conservancy projects according to claim 6 is characterized in that: The through holes on the annular circulation rack (802) are provided with multiple groups, including hollow leakage holes (80201), pressure holes with filters (80203) and sealing holes (80202). By rotating the annular circulation rack (802), the leakage hole (80201), the pressure hole (80203) or the sealing hole (80202) is switched to be connected with the through hole 1 (80101), and the functions of mixing, pressing down and separating precipitation are switched.

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

9. The sewage circulation purification treatment device for water conservancy projects according to claim 1 is characterized in that: The connecting pipe (6) and the water pump are connected to 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).

10. A method for circulating and purifying sewage for water conservancy projects, characterized in that: The sewage circulation purification treatment device for water conservancy projects according to claim 7 is adopted, and the steps are as follows: S1, water conservancy project sewage enters the primary purification chamber (101) from the water inlet pipe (2); S2, the sewage is filtered through the metal filter layer, the activated carbon filter layer, and the ceramic filter layer in sequence, and then enters the secondary purification chamber (102); S3, the lifting frame (702) is lifted and lowered, driving the telescopic tube (701) to extend and retract to supply liquid; the precipitant is sprayed downwards through the spray seat (704) into the sewage; S4, the annular circulation rack (802) rotates, the leakage hole (80201) is connected to the through hole 1 (80101), and the sewage and the precipitant are pressurized to pass through the leakage hole (80201) and the through hole 1 (80101); the turning plate (80301) rotates synchronously during the lifting process to mix the sewage and the precipitant; S5. After the mixing is completed, the turning plate (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 downward pressure plane; the downward pressure hole (80203) is connected with the through hole 1 (80101), the downward pressure plane descends, and the excess water leaks out from the downward pressure hole (80203) and the through hole 1 (80101), and the filter screen intercepts the precipitation; S6. When the precipitate is squeezed, the sealing hole (80202) is connected with the through hole 1 (80101), further forming a seal, and the precipitate is discharged from the bottom; S7. The sewage returns to the primary purification chamber (101) and enters the filtration and sedimentation treatment again.

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