Water purification system and method for water conservancy and hydropower

Abstract

The application discloses a water purification system and method for water conservancy and hydropower, and belongs to the technical field of water conservancy and hydropower engineering. The water purification system comprises a river channel, coarse filter pools arranged on both sides of the river channel, a support weir horizontally arranged in the river channel, the support weir being located between the two coarse filter pools and used for intercepting water in the river channel so that water flow is divided into two directions and flows into the two coarse filter pools respectively, a fishing mechanism arranged at an inlet of the coarse filter pool, and a water purification pool arranged between the two coarse filter pools. The water purification method comprises the following steps: S1, opening a gate in the river channel so that sewage in the river channel flows to the downstream of the river channel through the coarse filter pool and the water purification pool; S2, when an alarm is sounded, going to the support weir to clean solid impurities in a fishing basket; and S3, after the fishing basket is cleaned, relaxing a pull rope so that the fishing basket is reset. The application has the advantages of good water purification effect, large treatment capacity and low cost.

Description

Technical Field

[0001] This invention relates to the field of water conservancy and hydropower engineering technology, and more specifically, to a water purification system and method for water conservancy and hydropower. Background Technology

[0002] Water purification systems are essential components of water conservancy and hydropower projects. However, most existing water purification systems for water conservancy and hydropower use artificial wetlands and other methods for water purification. Although this method is low in cost, the purification effect is poor and it is prone to secondary pollution.

[0003] In view of this, the present invention provides a novel water purification system and method for water conservancy and hydropower. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a water purification system and method for water conservancy and hydropower, which has the advantages of good water purification effect, large treatment capacity and low cost.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A water purification system for water conservancy and hydropower projects, comprising:

[0007] River channel;

[0008] Coarse filter ponds set on both sides of the river channel;

[0009] A horizontally arranged support weir is provided in the river channel. The support weir is located between the two coarse filter tanks and is used to intercept the water in the river channel so that the water flow is divided into two directions and flows into the two coarse filter tanks respectively. The inlet of the coarse filter tank is equipped with a retrieval mechanism.

[0010] A water purification tank is located between the two coarse filter tanks.

[0011] A further preferred embodiment is that the salvage mechanism includes a salvage basket, a sleeve, a column, a connecting plate, and a fixing block;

[0012] The fixing block is fixed on the supporting weir, the lower end of the column is fixed on the fixing block, the upper end extends upward after protruding from the water surface, the sleeve is sleeved on the surface of the column, the upper end of the connecting plate is fixed to the sleeve, and the lower end is fixed to one end of the salvage basket.

[0013] One end of the retrieval basket is located on the side of the inlet of the coarse filter tank and close to the supporting weir, and the other end is located on the other side of the inlet of the coarse filter tank and close to the inner wall of the coarse filter tank. One end of the retrieval basket is fixed to the connecting plate, and the other end is connected to a pull rope.

[0014] A further preferred embodiment is that a limiting strip is fixed to the inner wall of the coarse filter tank, the limiting strip is close to the inlet of the coarse filter tank and is used to contact the end of the retrieval basket away from the connecting plate, and the limiting strip is located behind the retrieval basket in the direction of water flow.

[0015] A further preferred embodiment is that the outer surface of the column is provided with a sliding groove and a guide groove, the sliding groove is vertically arranged and its lower end smoothly transitions with the guide groove, the guide groove is gradually opened upward along the circumference of the column, and the lower end of the guide groove is connected to the lower end of the sliding groove;

[0016] A slider is fixed to the inner wall of the sleeve. The slider is adapted to the chute and the guide groove. When the retrieval basket is located laterally at the inlet of the coarse filter to retrieve floating objects in the water, the slider is located in the chute and slides up and down with the chute. When the retrieval basket is pulled back towards the supporting weir by the pull rope, the slider is located in the guide groove and slides with the guide groove.

[0017] The supporting weir has a notch near the column, and a sensor for detecting the position of the slider is installed at the notch. The water purification system for water conservancy and hydropower also includes a controller and an alarm. The controller is used to receive the slider position signal, and the output of the controller is connected to the input of the alarm.

[0018] A further preferred embodiment is that a float is installed at the bottom of the retrieval basket.

[0019] A further preferred embodiment is that the retrieval basket includes a back plate, a bottom plate, an end plate, and an inclined plate;

[0020] The end plate is fixed to the end of the base plate away from the column. The inclined plate and the back plate are respectively fixed to the front and rear sides of the base plate in the direction of water flow. The back plate is used to intercept floating objects in the water. One side of the inclined plate is fixed to the base plate, and the other side is inclined in the forward direction along the direction of water flow. Several through holes are provided on the back plate, the base plate, the end plate and the inclined plate.

[0021] A connecting ring for securing the pull rope is fixed to the inclined plate.

[0022] A further preferred embodiment is that the supporting dam is equipped with a rope winding device;

[0023] The rope winding device includes a guide ring, a winding device, a connecting rod, and a pulley. The top surface of the supporting dam is provided with a step, and the winding device is installed on the step. The side of the supporting dam is provided with a groove, and the pulley is installed in the groove. The guide ring is fixed to the supporting dam by the connecting rod. One end of the rope is connected to the retrieval basket, and the other end passes through the guide ring and the pulley before being connected to the winding device.

[0024] A support plate is provided above the coarse filter tank. One end of the support plate is fixed to the support weir, and the other end is fixed to the inner wall of the coarse filter tank. The support plate is flush with the step.

[0025] A further preferred embodiment is that the water purification tank is located behind the supporting weir in the direction of water flow, and a baffle is fixed between the water purification tank and the coarse filter tank. One side of the baffle is fixed to the supporting weir, and the other side is fixed to the inner wall of the coarse filter tank.

[0026] A partition is fixed above the baffle, and a plurality of equally spaced filter holes are provided at the bottom of the partition. A water-retaining weir is provided on the side of the water purification tank away from the supporting weir. The water-retaining weir is located in the river channel and has an overflow outlet at its top.

[0027] A further preferred embodiment is that the water purification tank is provided with a sand and gravel layer and an activated carbon layer, the sand and gravel layer is located below the activated carbon layer, the filter holes are located on one side of the activated carbon layer, and the horizontal height of the top surface of the sand and gravel layer is lower than the horizontal height of the overflow outlet.

[0028] The river channel is equipped with a gate, which is located in front of the water flow direction of the coarse filter.

[0029] A water purification method for water conservancy and hydropower projects includes the following steps:

[0030] S1. Open the sluice gates in the river channel so that the sewage in the river channel can flow to the downstream of the river channel after passing through the coarse filter and the water purification tank.

[0031] S2. When the alarm sounds, proceed to the support weir to clean the solid impurities in the salvage basket;

[0032] S3. After the retrieval basket is cleaned, loosen the rope to allow the retrieval basket to return to its original position.

[0033] In summary, this invention offers the following advantages: After floating debris is removed from the water surface by a dredging mechanism, the wastewater enters a coarse filter tank for sedimentation. It then passes through filter holes into a purification tank, where it is filtered sequentially through a sand and gravel layer and an activated carbon layer before finally overflowing. The outflowing water is the purified water. This water purification system is suitable for water conservancy and hydropower projects, offering a large purification capacity at low cost, good treatment effect, and virtually no secondary pollution.

[0034] The retrieval basket is horizontally positioned at the inlet of the coarse filter pond, thus intercepting floating debris in the river. As more and more solid impurities are collected in the retrieval basket, its weight gradually increases, causing it to gradually move downwards. When the slider moves downwards to the connection between the chute and the guide chute, the winding device is activated, and the rope begins to pull the retrieval basket towards the supporting weir. At this time, the retrieval basket rotates around the column. Because the guide chute gradually opens upwards along the circumference of the column, the retrieval basket moves upwards while being pulled back, allowing it to be removed from the water surface. This facilitates the filtration of water in the retrieval basket and makes it easier for operators to clean the solid impurities inside. Attached Figure Description

[0035] Figure 1 This is a top view diagram in Example 1, mainly used to illustrate the structure of the water purification system for water conservancy and hydropower.

[0036] Figure 2 This is a structural diagram from Example 1, mainly used to illustrate the structure of a water purification system for water conservancy and hydropower.

[0037] Figure 3 This is a cross-sectional schematic diagram in Example 1, mainly used to illustrate the internal structure of the water purification tank;

[0038] Figure 4 This is a partial top view of Embodiment 1, mainly used to illustrate the installation structure of the retrieval basket;

[0039] Figure 5 This is a partial structural diagram of Embodiment 1, mainly used to illustrate the structure of the salvage mechanism;

[0040] Figure 6 This is a partial cross-sectional view of Embodiment 1, mainly used to illustrate the structure of the sleeve and the groove;

[0041] Figure 7 This is a partial structural diagram of the column in Example 1, mainly used to illustrate the structure of the slide and guide groove;

[0042] Figure 8 This is a partial structural diagram of the column in Example 1, mainly used to illustrate the structure of the guide groove;

[0043] Figure 9 This is a cross-sectional schematic diagram in Example 1, mainly used to illustrate the structure of the retrieval basket;

[0044] Figure 10 This is a partial cross-sectional schematic diagram of Embodiment 1, mainly used to illustrate the structure of the rope winding device.

[0045] In the diagram, 1. River channel; 2. Sluice gate; 3. Coarse filter; 4. Salvage mechanism; 401. Salvage basket; 4011. Back plate; 4012. Bottom plate; 4013. End plate; 4014. Inclined plate; 402. Sleeve; 403. Pull rope; 404. Column; 405. Guide groove; 406. Connecting plate; 407. Fixing block; 408. Float; 409. Sliding block; 410. Slide; 5. Support plate 6. Support weir; 7. Purification tank; 8. Water retaining weir; 9. Overflow outlet; 10. Baffle; 11. Partition; 12. Sand and gravel layer; 13. Step; 14. Filter hole; 15. Notch; 16. Sensor; 17. Connecting ring; 18. Activated carbon layer; 191. Guide ring; 192. Winding device; 193. Connecting rod; 194. Groove; 195. Pulley; 196. Channel; 20. Limiting strip.

[0046] In the diagram, the arrows indicate the direction of water flow. Detailed Implementation

[0047] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0048] Example 1: A water purification system and method for water conservancy and hydropower, such as Figure 1-10 As shown, the water purification system includes a river channel 1, coarse filter tanks 3 located on both sides of the river channel 1, a controller, an alarm, a support weir 6 horizontally positioned within the river channel 1, and a purification tank 7 located between the two coarse filter tanks 3. The support weir 6 is located between the two coarse filter tanks 3 and is used to intercept water in the river channel 1, causing the water flow to split into two opposite directions and flow into the two coarse filter tanks 3 respectively. The support weir 6 is slightly wider than the river channel 1, meaning that both sides of the support weir 6 extend into the coarse filter tanks 3 on both sides of the river channel 1. Each coarse filter tank 3 has a retrieval mechanism 4 at its inlet for retrieving floating debris from the water.

[0049] The salvage mechanism 4 includes a salvage basket 401, a sleeve 402, a column 404, a connecting plate 406, and a fixing block 407. The fixing block 407 is located underwater and fixed to the supporting weir 6. The column 404 is vertically arranged with its lower end fixed to the fixing block 407 and its upper end extending upward beyond the water surface. The sleeve 402 is fitted onto the surface of the column 404 and can move up and down along the column 404 or rotate on the column 404. The upper end of the connecting plate 406 is fixed to the sleeve 402, and its lower end is fixed to one end of the salvage basket 401. One end of the salvage basket 401 is located on the side of the inlet of the coarse filter tank 3 and close to the supporting weir 6, and the other end is located on the other side of the inlet of the coarse filter tank 3 and close to the inner wall of the coarse filter tank 3. One end of the salvage basket 401 is fixed to the connecting plate 406, and the other end is connected to a pull rope 403. The outer surface of the column 404 is provided with a sliding groove 410 and a guide groove 405. The sliding groove 410 is vertically set and its lower end smoothly transitions with the guide groove 405. The guide groove 405 gradually opens upward along the circumference of the column 404, and its lower end is connected to the lower end of the sliding groove 410. A spherical or hemispherical slider 409 is fixed on the inner wall of the sleeve 402. The slider 409 is adapted to the sliding groove 410 and the guide groove 405. When the retrieval basket 401 is horizontally positioned at the inlet of the coarse filter tank 3 to retrieve floating objects in the water, the slider 409 is located in the sliding groove 410 and slides up and down with the sliding groove 410. When the retrieval basket 401 is pulled back towards the supporting weir 6 by the pull rope 403, the slider 409 is located in the guide groove 405 and slides with the guide groove 405. The purpose of the chute 410 is to ensure that the retrieval basket 401 can only move up and down, preventing the retrieval basket 401 from rotating on its own under the action of water flow. Therefore, the chute 410 is set on the side of the column 404 near the supporting weir 6.

[0050] The purpose of the guide groove 405 is to allow the retrieval basket 401 to rotate around the column 404 under the pull of the rope 403 when the slider 409 falls into the connection between the slide groove 410 and the guide groove 405. During rotation, the retrieval basket 401 gradually moves upwards, thus the guide groove 405 gradually opens upwards along the circumference of the column 404. A notch 15 is provided near the column 404 on the support weir 6. A sensor 16 for detecting the position of the slider 409 is installed at the notch 15. The sensor 16 can be an infrared sensor 16, an ultrasonic sensor 16, or others. The controller receives the slider 409 position signal transmitted by the sensor 16. The alarm can be a buzzer or other alarm device, and the controller output is connected to the alarm input.

[0051] Preferably, a limiting strip 20 is fixed to the inner wall of the coarse filter tank 3. The limiting strip 20 is close to the inlet of the coarse filter tank 3 and is used to contact the end of the retrieval basket 401 away from the connecting plate 406. The limiting strip 20 is located behind the retrieval basket 401 in the direction of water flow. The limiting strip 20 can restrict the retrieval basket 401 from rotating on its own under the action of water flow, which helps to protect the slider 409 and the sliding groove 410 and prevents the slider 409 and the sliding groove 410 from being damaged by lateral friction.

[0052] A rope winding device is provided on the supporting dam 6. The rope winding device includes a guide ring 191, a winding device 192, a connecting rod 193, and a pulley 195. A step 13 is provided on the top surface of the supporting dam 6. The winding device 192 is installed on the step 13. The winding device 192 can be a manual winding device, a winch, or other electric winding equipment. In this embodiment, the winding device 192 is a winch. A groove 194 is provided on the side of the supporting dam 6. The pulley 195 is installed in the groove 194. The guide ring 191 is fixed to the supporting dam 6 by the connecting rod 193. A channel 196 is provided in the supporting dam 6 for the rope 403 to pass through. One end of the rope 403 is connected to the retrieval basket 401, and the other end passes through the guide ring 191, the pulley 195, and then through the channel 196 and connects to the winding device 192.

[0053] It should be noted that when the winding device 192 is a manual winding device, when the sensor 16 detects that the slider 409 has fallen into the connection between the slide groove 410 and the guide groove 405, the controller activates the alarm, prompting the staff to manually pull the retrieval basket 401 back to the edge of the support dam 6 for cleaning. When the winding device 192 is a winch or other electric winding equipment, the controller output is connected to the motor of the winch or other electric winding equipment. When the sensor 16 detects that the slider 409 has fallen into the connection between the slide groove 410 and the guide groove 405, the controller activates the alarm and starts the motor, thereby pulling the retrieval basket 401 back to the edge of the support dam 6.

[0054] A support plate 5 is installed above the coarse filter tank 3. One end of the support plate 5 is fixed to the support weir 6, and the other end is fixed to the inner wall of the coarse filter tank 3. The support plate 5 is flush with the step 13. The support plate 5 is mainly installed to facilitate the workers to walk on the support weir 6 to clean the retrieval basket 401.

[0055] To bring the retrieval basket 401 close to the water surface, preferably, multiple floats 408 are installed at the bottom of the retrieval basket 401, and these floats 408 are evenly spaced along the length of the retrieval basket 401. The arrangement of the floats 408 allows the retrieval basket 401 to better adapt to changes in the water surface, facilitating the retrieval of solid debris such as aquatic plants floating on the water surface.

[0056] Preferably, the retrieval basket 401 includes a back plate 4011, a bottom plate 4012, an end plate 4013, and an inclined plate 4014. The end plate 4013 is fixed to the end of the bottom plate 4012 away from the column 404. The inclined plate 4014 and the back plate 4011 are respectively fixed to the front and rear sides of the bottom plate 4012 in the direction of water flow. The back plate 4011 is used to intercept floating objects in the water. One side of the inclined plate 4014 is fixed to the bottom plate 4012, and the other side is inclined forward in the direction of water flow. The back plate 4011, the bottom plate 4012, the end plate 4013, and the inclined plate 4014 are all provided with several through holes. A connecting ring 17 for fixing the pull rope 403 is fixed on the inclined plate 4014. The inclined plate 4014 is always kept below the water surface.

[0057] In the above scheme, the retrieval basket 401 is horizontally set at the inlet of the coarse filter pool 3. Therefore, floating objects in the river channel 1 can be intercepted in the retrieval basket 401. As more and more solid impurities are collected in the retrieval basket 401, the weight of the retrieval basket 401 gradually increases, and it gradually moves downward. When the slider 409 moves downward to the connection between the slide 410 and the guide groove 405, the winding device 192 is activated, and the pull rope 403 begins to pull the retrieval basket 401 towards the support weir 6. At this time, the retrieval basket 401 rotates around the column 404. Since the guide groove 405 gradually opens upward along the circumference of the column 404, the retrieval basket 401 will also move upward while being pulled back, so that the retrieval basket 401 is moved out of the water surface, which is convenient for filtering out the water in the retrieval basket 401 and for the operator to clean the solid impurities in the retrieval basket 401.

[0058] Reference Figure 1-10 The water purification tank 7 is located behind the supporting weir 6 in the direction of water flow. A baffle 10 is fixed between the water purification tank 7 and the coarse filter tank 3. One side of the baffle 10 is fixed to the supporting weir 6, and the other side is fixed to the inner wall of the coarse filter tank 3. The baffle 10 is located below the opposite sides of the water purification tank 7 and is used to intercept heavier solid impurities such as stones and sludge, so that these impurities are intercepted in the coarse filter tank 3. A partition 11 is fixed above the baffle 10. One side of the partition 11 is fixed to the supporting weir 6, and the other side is fixed to the inner wall of the coarse filter tank 3. Multiple filter holes 14 are opened at equal intervals at the bottom of the partition 11. A water-retaining weir 8 is set on the side of the water purification tank 7 away from the supporting weir 6. The water-retaining weir 8 is located in the river channel 1 and has an overflow outlet 9 at its top. Multiple overflow outlets 9 are set at equal intervals along the width direction of the river channel 1. The water purification tank 7 contains a sand and gravel layer 12 and an activated carbon layer 18. The sand and gravel layer 12 is located below the activated carbon layer 18, and the filter holes 14 are located on one side of the activated carbon layer 18. The top surface of the sand and gravel layer 12 is lower than the overflow outlet 9 to prevent the sand and gravel from being washed away. A gate 2 is installed in the river channel 1, located in front of the water flow direction of the coarse filter tank 3. The gate 2 can be manual, electric, or pneumatic.

[0059] In the above technical solution, after the wastewater is cleaned by the dredging mechanism 4 to remove floating debris, it enters the coarse filter tank 3 for sedimentation. Then, it passes through the filter holes 14 into the water purification tank 7. The water in the water purification tank 7 is filtered sequentially through the sand and gravel layer 12 and the activated carbon layer 18, and finally flows out through the overflow port 9. The outflowing water is the purified water. This water purification system is suitable for water conservancy and hydropower projects and has low purification costs.

[0060] Water purification methods for water conservancy and hydropower projects include the following steps:

[0061] S1. Open the gate 2 inside the river channel 1 so that the sewage in the river channel 1 flows to the downstream of the river channel 1 after passing through the coarse filter tank 3 and the water purification tank 7.

[0062] S2. When the alarm sounds, go to the support weir 6 to clean the solid impurities in the salvage basket 401;

[0063] S3. After the retrieval basket 401 is cleaned, loosen the pull rope 403. The retrieval basket 401 will automatically reset under the action of water flow. Alternatively, you can use external force to push the end of the retrieval basket 401 away from the column 404.

[0064] It requires virtually no manual operation and is simple and convenient to use.

[0065] Example 2: A water purification system and method for water conservancy and hydropower, which differs from Example 1 in that the support weir 6 is not equipped with a rope winding device, that is, the rope 403 is manually controlled, one end of the rope 403 is fixed to the connecting ring 17, and the other end is fixed to the support weir 6 by binding or other detachable means.

[0066] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A water purification system for water conservancy and hydropower, characterized in that: include: River channel (1); Coarse filter ponds (3) are set on both sides of the river channel (1); A support weir (6) is set horizontally in the river channel (1). The support weir (6) is located between the two coarse filter tanks (3) and is used to intercept the water in the river channel (1) so that the water flow is divided into two directions and flows into the two coarse filter tanks (3) respectively. A dredging mechanism (4) is provided at the inlet of the coarse filter tank (3). A water purification tank (7) is set between the two coarse filter tanks (3); The salvage mechanism (4) includes a salvage basket (401), a sleeve (402), a column (404), a connecting plate (406), and a fixing block (407). The fixing block (407) is fixed on the supporting weir (6), the lower end of the column (404) is fixed on the fixing block (407), the upper end extends upward after protruding from the water surface, the sleeve (402) is sleeved on the surface of the column (404), the upper end of the connecting plate (406) is fixed to the sleeve (402), and the lower end is fixed to one end of the salvage basket (401); One end of the retrieval basket (401) is located on the side of the inlet of the coarse filter (3) and close to the support weir (6), and the other end is located on the other side of the inlet of the coarse filter (3) and close to the inner wall of the coarse filter (3). One end of the retrieval basket (401) is fixed to the connecting plate (406), and the other end is connected to the pull rope (403). The outer surface of the column (404) is provided with a sliding groove (410) and a guide groove (405). The sliding groove (410) is vertically set and its lower end smoothly transitions with the guide groove (405). The guide groove (405) is opened gradually upward along the circumference of the column (404). The lower end of the guide groove (405) is connected to the lower end of the sliding groove (410). A slider (409) is fixed to the inner wall of the sleeve (402). The slider (409) is adapted to the chute (410) and the guide groove (405). When the retrieval basket (401) is positioned laterally at the inlet of the coarse filter (3) to retrieve floating objects in the water, the slider (409) is located in the chute (410) and slides up and down with the chute (410). When the retrieval basket (401) is pulled back towards the support weir (6) by the pull rope (403), the slider (409) is located in the guide groove (405) and slides with the guide groove (405). The supporting weir (6) has a notch (15) near the column (404), and a sensor (16) for detecting the position of the slider (409) is installed at the notch (15). The water purification system for water conservancy and hydropower also includes a controller and an alarm. The controller is used to receive the position signal of the slider (409), and the output end of the controller is connected to the input end of the alarm. The retrieval basket (401) includes a back plate (4011), a bottom plate (4012), an end plate (4013), and an inclined plate (4014). The end plate (4013) is fixed to the end of the base plate (4012) away from the column (404). The inclined plate (4014) and the back plate (4011) are respectively fixed to the front and rear sides of the base plate (4012) in the direction of water flow. The back plate (4011) is used to intercept floating objects in the water. One side of the inclined plate (4014) is fixed to the base plate (4012), and the other side is inclined in the forward direction along the direction of water flow. The back plate (4011), the base plate (4012), the end plate (4013) and the inclined plate (4014) are all provided with several through holes. A connecting ring (17) for securing the pull rope (403) is fixed on the inclined plate (4014).

2. The water purification system for water conservancy and hydropower according to claim 1, characterized in that: The inner wall of the coarse filter (3) is fixed with a limiting strip (20). The limiting strip (20) is close to the inlet of the coarse filter (3) and is used to contact the end of the retrieval basket (401) away from the connecting plate (406). The limiting strip (20) is located behind the retrieval basket (401) in the direction of water flow.

3. A water purification system for water conservancy and hydropower according to claim 1, characterized in that: The bottom of the salvage basket (401) is equipped with a float (408).

4. A water purification system for water conservancy and hydropower according to any one of claims 1-3, characterized in that: The supporting weir (6) is equipped with a rope winding device; The rope winding device includes a guide ring (191), a winding device (192), a connecting rod (193), and a pulley (195). The top surface of the support dam (6) is provided with a step (13). The winding device (192) is installed on the step (13). The side of the support dam (6) is provided with a groove (194). The pulley (195) is installed in the groove (194). The guide ring (191) is fixed on the support dam (6) by the connecting rod (193). One end of the rope (403) is connected to the retrieval basket (401), and the other end passes through the guide ring (191) and the pulley (195) before being connected to the winding device (192). A support plate (5) is provided above the coarse filter tank (3). One end of the support plate (5) is fixed to the support weir (6), and the other end is fixed to the inner wall of the coarse filter tank (3). The support plate (5) is flush with the step (13).

5. A water purification system for water conservancy and hydropower according to claim 1, characterized in that: The water purification tank (7) is located behind the water flow direction of the supporting weir (6). A baffle (10) is fixed between the water purification tank (7) and the coarse filter tank (3). One side of the baffle (10) is fixed on the supporting weir (6), and the other side is fixed on the inner wall of the coarse filter tank (3). A partition (11) is fixed above the baffle (10). A plurality of filter holes (14) are provided at equal intervals at the bottom of the partition (11). A water-blocking weir (8) is provided on the side of the water purification tank (7) away from the supporting weir (6). The water-blocking weir (8) is located in the river channel (1) and has an overflow outlet (9) at the top.

6. A water purification system for water conservancy and hydropower according to claim 5, characterized in that: The water purification tank (7) is provided with a sand and gravel layer (12) and an activated carbon layer (18). The sand and gravel layer (12) is located below the activated carbon layer (18), and the filter holes (14) are located on one side of the activated carbon layer (18). The horizontal height of the top surface of the sand and gravel layer (12) is lower than the horizontal height of the overflow port (9). The river channel (1) is equipped with a gate (2), which is located in front of the coarse filter (3) in the direction of water flow.

7. A water purification method for a water purification system for water conservancy and hydropower as described in claim 1, characterized in that: Includes the following steps: S1. Open the gate (2) inside the river channel (1) so that the sewage in the river channel (1) flows to the downstream of the river channel (1) after passing through the coarse filter (3) and the water purification pool (7); S2. When the alarm sounds, go to the support weir (6) to clean the solid impurities in the salvage basket (401); S3. After the retrieval basket (401) is cleaned, loosen the pull rope (403) to reset the retrieval basket (401).

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