Desilting and purifying system and method

Abstract

The invention provides a desilting and purifying system and method, and belongs to the technical field of river desilting governance, the desilting and purifying system comprises a desilting device and sludge purifying devices, the desilting device is arranged on the water surface of a river, and the sludge purifying devices are arranged on both sides of the river. The desilting device comprises a ship body, a lifter, a stirring and sucking device, a sludge pump and a sludge discharging hose, the ship body comprises buoyancy cabins, an equipment cabin and an operation cabin, the buoyancy cabins are arranged at the two ends of the lower portion of the ship body, the equipment cabin is arranged at the upper end of the buoyancy cabins, the operation cabin is arranged in the center of the ship body and is of a hollow structure, and the lifter is arranged on the upper portion of the operation cabin. A lifting rod is arranged on the lifter, the stirring and sucking device is arranged at the bottom of the lifting rod, a sludge outlet is formed in the top end of the stirring and sucking device, a sludge discharging hose is arranged at the sludge outlet, the sludge pump is arranged in the equipment cabin, the sludge inlet end of the sludge pump is communicated with the sludge outlet through the sludge discharging hose, and the sludge outlet end of the sludge pump is communicated with the sludge purifying device through the sludge discharging hose. The design is scientific and reasonable, arrangement is convenient, and operation cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of river silt removal and management, and in particular to a silt removal and purification system and method. Background Art

[0002] Rivers play an important role in social development. They are effective channels to avoid flood disasters. They can store and discharge flood water during the summer flood season. At the same time, they can cooperate with gates and reservoirs to reduce the peak water flow of rivers, delay floods and relieve the pressure on dams. Every once in a while, rivers need to be desilted. Desilting can protect the smooth flow of rivers, control the river situation and stabilize the water flow.

[0003] At present, the main operation mode of river dredging is to dig out the silt from the riverbed by excavators or dredgers, and store the sucked silt on the boat, or transport the excavated silt to a special treatment station for treatment by silt cleaning vehicles on both sides of the river. During the transportation process, the silt will be scattered and need to be cleaned. During the transportation of silt, it is easy to produce odor on urban roads, which is not conducive to the effective management of the city's appearance. In addition, the existing treatment station has limited silt storage capacity, and the efficiency of dredging will be limited by its own capacity, resulting in low work efficiency; at the same time, the storage of silt is easy to cause air pollution in the surrounding area.

[0004] The Chinese patent "A Hydraulic Engineering Desilting Device for Rivers" (application number: 202310207982.0) discloses a hydraulic engineering desilting device for rivers, which can transport sludge into filter bags for collection, and can achieve convenient and fast handling and transportation, with high economic benefits. The process of collecting sludge is not limited by capacity, and the work efficiency is high. At the same time, the overall device will not affect the surrounding environment during the sludge transportation process. However, the patent has a complex structure and high manufacturing and operating costs. Summary of the invention

[0005] The object of the present invention is to provide a silt removal and purification system and method, which has scientific and reasonable design, convenient layout and low operating cost.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] In a first aspect, a silt clearing and purification system is provided, characterized in that it comprises a silt clearing device and a silt purification device, wherein the silt clearing device is arranged on the water surface of a river, and the silt purification device is arranged on both banks of the river.

[0008] The dredging device includes a hull, a lift, an agitator, a sludge pump and a sludge discharge hose. The hull includes a buoyancy chamber, an equipment chamber and an operating chamber. The buoyancy chamber is arranged at both ends of the lower part of the hull, and the buoyancy chamber is a sealed structure. The equipment chamber is arranged at both ends of the upper part of the hull, and the equipment chamber is arranged at the upper end of the buoyancy chamber. The operating chamber is arranged at the center part of the hull, and the operating chamber is a hollow structure. The lift is arranged at the upper part of the operating chamber, and the lift is fixed on the bulkhead of the operating chamber. A lifting rod is arranged on the lift. The agitator is arranged at the bottom of the lifting rod, and a mud outlet is arranged at the top of the agitator. A mud discharge hose is arranged at the mud outlet. The sludge pump is arranged inside the equipment chamber, and the mud inlet end of the sludge pump is connected to the mud outlet through a mud discharge hose, and the mud outlet end of the sludge pump is connected to the sludge purification device through a mud discharge hose.

[0009] Furthermore, the agitator includes a mud and water chamber, a stirring roller and a stirring rack. The mud and water chamber is a rectangular structure. A mud outlet is arranged at the top of the mud and water chamber. One side of the mud and water chamber is open, and the other sides are sealed. The stirring roller is arranged on one side of the opening of the mud and water chamber. The stirring roller is connected to the mud and water chamber as a whole. A motor is installed inside the stirring roller, and a plurality of stirring racks are arranged on the stirring roller.

[0010] A fence is arranged at one side of the mud and water chamber opening, the fence is provided with a vertical gap, and the stirring rack part extends into the vertical gap of the fence.

[0011] Furthermore, the sludge purification device includes a high-level water distribution ditch, a primary sedimentation ditch, a secondary sedimentation ditch, a filtering inclined bed, an ornamental ditch and an oxygenating slope.

[0012] The high-level water distribution ditch is arranged at the upper part of the river bank, the high-level water distribution ditch is arranged parallel to the river, a plurality of water inlets are arranged at the upper part of the high-level water distribution ditch, the plurality of water inlets are connected to the sludge pump through a sludge discharge hose, the primary sedimentation ditch is arranged downstream of the high-level water distribution ditch, the primary sedimentation ditch is arranged parallel to the high-level water distribution ditch, the secondary sedimentation ditch is arranged downstream of the primary sedimentation ditch, the secondary sedimentation ditch is arranged parallel to the primary sedimentation ditch, the filtering inclined bed is arranged downstream of the secondary sedimentation ditch, the filtering inclined bed is arranged parallel to the secondary sedimentation ditch, the ornamental ditch is arranged downstream of the filtering inclined bed, and the oxygenation slope is arranged downstream of the ornamental ditch.

[0013] Furthermore, the channel body of the high-level water distribution ditch is made of concrete and environmentally friendly bricks, a cover plate is provided on the top of the high-level water distribution ditch, a slope inclined toward the center of the river is provided at the bottom of the high-level water distribution ditch, a discharge outlet is provided every 1 to 5 meters at the lower end of the slope, and a water level regulating plate is provided on the discharge outlet.

[0014] A liquid medicine adding distributor is arranged inside the high-level water distribution ditch, and the liquid medicine inside the liquid medicine adding distributor is a flocculant.

[0015] Furthermore, the channel body of the primary sedimentation ditch is made of concrete and environmentally friendly bricks, and a first seepage wall is provided on the side of the primary sedimentation ditch close to the river. A first seepage board is arranged on the first seepage wall, and holes are provided on the first seepage board. The first seepage board is made of hard plastic.

[0016] Furthermore, the secondary ditch can receive seepage water from the primary ditch, the channel body of the secondary ditch is made of concrete and environmentally friendly bricks, a second seepage wall is provided on the side of the secondary ditch close to the river, a second seepage board is arranged on the second seepage wall, the second seepage board is provided with holes, and the second seepage board is made of hard plastic.

[0017] Furthermore, the filtering inclined bed can receive seepage water from the secondary sedimentation ditch, and the filtering inclined bed includes a plain soil anti-seepage layer, a filter material layer, a soil planting layer and a filtering retaining wall.

[0018] The plain soil anti-seepage layer is arranged at the bottom of the filtering inclined bed, the filter material layer is arranged above the plain soil anti-seepage layer, the soil planting layer is arranged above the filter material layer, and plants are selected in the soil planting layer. The filtering retaining wall is arranged on the downstream side of the filtering inclined bed, the filtering retaining wall is made of concrete, and a plurality of drainage outlets are arranged in the wall of the filtering retaining wall.

[0019] Furthermore, the ornamental ditch is a rectangular parallelepiped structure, a ditch wall is provided at one end downstream of the ornamental ditch, the height of the ditch wall is lower than the height of the filtering retaining wall, and ornamental plants are planted in the ornamental ditch.

[0020] Furthermore, the oxygenating slope is an inclined wall structure, the oxygenating slope is connected to the ditch wall and the river bank at the downstream end of the ornamental ditch, and a plurality of protrusions are arranged on the wall structure of the oxygenating slope.

[0021] In a second aspect, a dredging and purification method is characterized by comprising the following steps:

[0022] 1) Operate the lift to sink the lifting rod and the agitator into the mud at the bottom of the ship. The motor inside the agitator roller drives the agitator roller to rotate, and the agitator rack stirs the mud and water and mixes them. The mud and water mixture enters the mud and water chamber through the gap of the fence. The bulky objects are blocked by the fence. The mud and water mixture enters the high-level water distribution ditch through the sludge pump and the mud discharge hose. The liquid adding distributor adds flocculant, and the water level regulating plate adjusts the flow rate of the water out of the discharge port.

[0023] 2) The muddy water mixed with the liquid medicine flows from the high-level water distribution ditch into the primary sedimentation ditch, where the muddy water settles and separates. The clean water on the upper part of the primary sedimentation ditch flows out through the first seepage wall and enters the secondary sedimentation ditch for further sedimentation treatment. The clean water on the upper part of the secondary sedimentation ditch flows out through the second seepage wall.

[0024] 3) The water from the secondary sedimentation ditch enters the filter inclined bed through the second seepage plate. Under the action of gravity, the water is filtered by the filter material layer of the filter inclined bed to produce filtrate. The plants planted on the soil planting layer absorb the pollutants in the leaching, and the pollutants are removed through the harvesting of the plants.

[0025] 4) The filtrate flows through the drainage outlet of the filter retaining wall into the ornamental ditch, which produces the treatment effect of a plug-flow biochemical pool to biochemically treat the water. The ornamental plants planted in the water absorb pollutants in the water to biologically treat the water.

[0026] 5) The treated water in the ornamental ditch flows out from the outlet and flows through the oxygenating slope. The protrusions on the oxygenating slope stir the water flow to form water splashes, aerate and oxygenate the water, and perform aerobic biochemical treatment on the water. The aerated and oxygenated water flows into the river, completing the water purification treatment.

[0027] 6) When the silt in the primary and secondary sedimentation ditches accumulates to the designed height, water intake is stopped, the silt is allowed to dry naturally and then dug out for disposal.

[0028] Advantages of the present invention:

[0029] 1. The dredging device has a simple structure, is easy to install and operate, and has low operating costs.

[0030] 2. The agitator mixes mud and water while avoiding clogging by debris.

[0031] 3. Transform the river bank into a sludge purification device, which is easy to construct and has low construction cost.

[0032] 4. The purification device relies on gravity flow, with little human intervention.

[0033] 5. The viewing ditch provides landscape facilities and beautifies the environment.

[0034] 6. While dredging, the river water quality is purified. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic structural diagram of a silt removal and purification system according to an embodiment of the present invention;

[0036] In the figure: 1. dredging device, 11. hull, 1101. buoyancy chamber, 1102. equipment chamber, 1103. operation chamber, 12. elevator, 1201. lifting rod, 13. agitator, 1301. mud chamber, 1302. stirring roller, 1303. stirring rack, 14. sludge pump, 15. mud discharge hose;

[0037] 2. Silt purification device, 21. High-level water distribution ditch, 22. Primary sedimentation ditch, 23. Secondary sedimentation ditch, 24. Filter inclined bed, 2401. Plain soil anti-seepage layer, 2402. Filter material layer, 2403. Soil planting layer, 2404. Filter retaining wall, 25. Ornamental ditch, 26. Oxygenated slope, 2601. Protrusion. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention.

[0039] like Figure 1 As shown, a silt clearing and purification system comprises a silt clearing device 1 and a silt purification device 2. The silt clearing device 1 is arranged on the water surface of a river, and the silt purification device 2 is arranged on both banks of the river.

[0040] The dredging device 1 includes a hull 11, a lift 12, an agitator 13, a sludge pump 14 and a sludge discharge hose 15. The hull 11 includes a buoyancy chamber 1101, an equipment chamber 1102 and an operation chamber 1103. The buoyancy chamber 1101 is arranged at both ends of the lower part of the hull 11, and the buoyancy chamber 1101 is a sealed structure. The equipment chamber 1102 is arranged at both ends of the upper part of the hull 11, and the equipment chamber 1102 is arranged at the upper end of the buoyancy chamber 1101. The operation chamber 1103 is arranged at the center of the hull 11, and the operation chamber 1103 is a hollow structure. The lift 12 is arranged at the upper part of the operation chamber 1103, and the lift 12 is fixed to the bulkhead of the operation chamber 1103.

[0041] The lift 12 is provided with a lifting rod 1201, which moves up and down in the vertical direction, and the lifting rod 1201 can sink into the mud at the bottom of the ship. The agitator 13 is provided at the bottom of the lifting rod 1201, and moves up and down with the lifting rod 1201. The top of the agitator 13 is provided with a mud outlet, and a mud discharge hose 15 is provided at the mud outlet. The mud pump 14 is provided inside the equipment cabin 1102, and the mud inlet end of the mud pump 14 is connected to the mud outlet through the mud discharge hose 15, and the mud outlet end of the mud pump 14 is connected to the mud purification device 2 through the mud discharge hose 15.

[0042] As a preferred embodiment of the present invention, the agitator 13 includes a mud and water chamber 1301, a stirring roller 1302 and a stirring rack 1303. The mud and water chamber 1301 is a rectangular parallelepiped structure. A mud outlet is arranged at the top of the mud and water chamber 1301. One side of the mud and water chamber 1301 is open, and the other sides are sealed. The stirring roller 1302 is arranged on one side of the opening of the mud and water chamber 1301. The stirring roller 1302 is connected to the mud and water chamber 1301 as a whole. A motor is installed inside the stirring roller 1302, and the motor drives the stirring roller 1302 to rotate. A plurality of stirring racks 1303 are arranged on the stirring roller 1302.

[0043] A fence is provided at one side of the opening of the mud and water chamber 1301. The fence is provided with vertical gaps, and mud and water enter the mud and water chamber 1301 through the gaps, and large objects are intercepted by the fence. The stirring rack 1303 partially extends into the vertical gap of the fence. When the stirring roller 1302 drives the stirring rack 1303 to rotate, on the one hand, the sludge is stirred to mix the mud and water, which is convenient for the suction of the sludge pump. On the other hand, the rotation of the stirring rack 1303 can clean up the debris blocking the gap of the fence.

[0044] As a preferred embodiment of the present invention, the sludge purification device 2 includes a high-level water distribution ditch 21, a primary sedimentation ditch 22, a secondary sedimentation ditch 23, a filtering inclined bed 24, an ornamental ditch 25 and an oxygenation slope 26.

[0045] The high-level water distribution ditch 21 is arranged at the upper part of the river bank, and the high-level water distribution ditch 21 is arranged parallel to the river. A plurality of water inlets are arranged at the upper part of the high-level water distribution ditch 21, and the plurality of water inlets are connected to the sludge pump 14 through a sludge discharge hose 15. The primary sedimentation ditch 22 is arranged downstream of the high-level water distribution ditch 21, and the primary sedimentation ditch 22 is arranged parallel to the high-level water distribution ditch 21. The secondary sedimentation ditch 23 is arranged downstream of the primary sedimentation ditch 22, and the secondary sedimentation ditch 23 is arranged parallel to the primary sedimentation ditch 22. The filtering inclined bed 24 is arranged downstream of the secondary sedimentation ditch 23, and the filtering inclined bed 24 is arranged parallel to the secondary sedimentation ditch 23. The ornamental ditch 25 is arranged downstream of the filtering inclined bed 24, and the oxygenation slope 26 is arranged downstream of the ornamental ditch 25.

[0046] As a preferred embodiment of the present invention, the channel body of the high-level water distribution ditch 21 is made of concrete and environmentally friendly bricks, a cover plate is provided on the top of the high-level water distribution ditch 21, and a slope inclined toward the center of the river is provided at the bottom of the high-level water distribution ditch 21 to reduce siltation. A discharge outlet is provided at every 1 to 5 meters at the lower end of the slope, and a water level regulating plate is provided on the discharge outlet.

[0047] A liquid medicine adding distributor is provided inside the high-level water distribution ditch 21, and the liquid medicine inside the liquid medicine adding distributor is a flocculant.

[0048] The design of the high-level water distribution ditch 21 is fully integrated with the geographical topography, beautifies the environment, and can be used as a corridor for people to take a leisure walk.

[0049] As a preferred embodiment of the present invention, the channel body of the primary sedimentation ditch 22 is made of concrete and environmentally friendly bricks, and a first seepage wall is provided on the side of the primary sedimentation ditch 22 close to the river, and a first seepage board is arranged on the first seepage wall, and holes are provided on the first seepage board, and the first seepage board is made of hard plastic.

[0050] As a preferred embodiment of the present invention, the secondary ditch 23 can receive seepage water from the primary ditch 22. The channel body of the secondary ditch 23 is made of concrete and environmentally friendly bricks. A second seepage wall is provided on the side of the secondary ditch 23 close to the river. A second seepage board is arranged on the second seepage wall. The second seepage board is provided with holes. The second seepage board is made of hard plastic.

[0051] As a preferred embodiment of the present invention, the filtering inclined bed 24 can receive seepage water from the secondary sedimentation ditch 23 , and the filtering inclined bed 24 includes a plain soil anti-seepage layer 2401 , a filter material layer 2402 , a soil planting layer 2403 and a filtering retaining wall 2404 .

[0052] The plain soil anti-seepage layer 2401 is arranged at the bottom of the filtering inclined bed 24, the filter material layer 2402 is arranged above the plain soil anti-seepage layer 2401, and the filter material of the filter material layer includes pebbles or gravel; the soil planting layer 2403 is arranged above the filter material layer 2402, and the soil planting layer 2403 is selected with plants, and the filtering retaining wall 2404 is arranged on the downstream side of the filtering inclined bed 24, the filtering retaining wall 2404 is made of concrete, and a plurality of drainage outlets are arranged in the wall of the filtering retaining wall 2404.

[0053] The plants selected for the soil planting layer 2403 meet the following requirements: 1. Strong pollution resistance; 2. Use native species and plant according to the soil and local conditions; 3. Strong disease resistance; 4. Easy to harvest and dispose of; 5. Well-developed root system and dense stems and leaves; 6. Mainly for viewing in cities, the economic utilization value of plants in suburbs and rural areas is higher.

[0054] As a preferred embodiment of the present invention, the ornamental ditch 25 is a rectangular structure, and a ditch wall is provided at one end downstream of the ornamental ditch 25. The height of the ditch wall is lower than the height of the filtering retaining wall 2404. The ditch wall is the water outlet end, and ornamental plants including lotus, daffodil, water lily and water chestnut are planted in the ornamental ditch 25.

[0055] As a preferred embodiment of the present invention, the oxygenation slope 26 is an inclined wall structure, and the oxygenation slope 26 is connected to the ditch wall and the river bank at the downstream end of the ornamental ditch 25. The wall structure of the oxygenation slope 26 is provided with a plurality of protrusions 2601, and the protrusions 2601 disturb the water flow to form water splashes, which has the function of aeration and oxygenation. The aerated and oxygenated water flows into the river.

[0056] Based on the above-mentioned dredging and purification system, the present invention also proposes a dredging and purification method, comprising the following steps:

[0057] 1) Operate the lift 12 to sink the lift rod 1201 and the agitator 13 into the mud at the bottom of the ship. The motor inside the agitator roller 1302 drives the agitator roller 1302 to rotate, and the agitator rack 1303 stirs and mixes the mud and water. The mud and water mixture enters the mud and water chamber 1301 through the gap of the fence. The bulky objects are blocked by the fence. The mud and water mixture enters the high-level water distribution ditch 21 through the sludge pump 14 and the mud discharge hose 15. The liquid adding distributor adds flocculant, and the water level regulating plate adjusts the flow rate of the water out of the discharge port.

[0058] 2) The muddy water mixed with the liquid medicine flows from the high-level water distribution ditch 21 into the primary sedimentation ditch 22, where the muddy water settles and separates. The clean water on the upper part of the primary sedimentation ditch 22 flows out through the first seepage wall and enters the secondary sedimentation ditch 23 for further sedimentation treatment. The clean water on the upper part of the secondary sedimentation ditch 23 flows out through the second seepage wall.

[0059] 3) Water from the second sedimentation ditch 23 enters the filtering inclined bed 24 through the second seepage plate. Under the action of gravity, the water is filtered by the filter material layer 2402 of the filtering inclined bed 24 to produce filtrate. The plants planted on the soil planting layer 2403 absorb the pollutants in the leaching, and the pollutants are removed through the harvesting of the plants.

[0060] 4) The filtrate flows through the drainage outlet of the filter retaining wall 2404 and enters the ornamental ditch 25. The ornamental ditch 25 produces the treatment effect of a plug-flow biochemical pool to biochemically treat the water. The ornamental plants planted in the water absorb pollutants in the water to biologically treat the water.

[0061] 5) The treated water in the viewing ditch 25 flows out from the outlet end and flows through the oxygenation slope 26. The protrusions 2601 on the oxygenation slope stir the water flow to form water splashes, aerate and oxygenate the water, and perform aerobic biochemical treatment on the water. The aerated and oxygenated water flows into the river, completing the water purification treatment.

[0062] 6) When the sludge in the primary sedimentation ditch 22 and the secondary sedimentation ditch 23 accumulates to the designed height, water intake is stopped, the sludge is naturally dried, and then dug out for disposal.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art can still adjust the technical solutions described in the above embodiments or replace some of the technical features by equivalents. Therefore, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A dredging and purification system, characterized in that: It comprises a silt clearing device (1) and a silt purifying device (2), wherein the silt clearing device (1) is arranged on the water surface of a river, and the silt purifying device (2) is arranged on both banks of the river; The dredging device (1) comprises a hull (11), a lift (12), an agitator (13), a sludge pump (14) and a sludge discharge hose (15); the hull (11) comprises a buoyancy chamber (1101), an equipment chamber (1102) and an operation chamber (1103); the buoyancy chamber (1101) is arranged at two ends of the lower part of the hull (11); the buoyancy chamber (1101) is a sealed structure; the equipment chamber (1102) is arranged at two ends of the upper part of the hull (11); the equipment chamber (1102) is arranged at the upper end of the buoyancy chamber (1101); the operation chamber (1103) is arranged at the center of the hull (11); the operation chamber (1103) is a hollow chamber. The invention relates to a structure in which the lift (12) is arranged at the upper part of the operating cabin (1103), the lift (12) is fixed on the bulkhead of the operating cabin (1103), the lift (12) is provided with a lifting rod (1201), the agitator (13) is arranged at the bottom of the lifting rod (1201), the top end of the agitator (13) is provided with a mud outlet, the mud outlet is provided with a mud discharge hose (15), the sludge pump (14) is arranged inside the equipment cabin (1102), the mud inlet end of the sludge pump (14) is connected to the mud outlet through the mud discharge hose (15), and the mud outlet end of the sludge pump (14) is connected to the sludge purification device (2) through the mud discharge hose (15).

2. A dredging and purification system according to claim 1, characterized in that: The agitator (13) comprises a mud and water chamber (1301), a stirring roller (1302) and a stirring rack (1303); the mud and water chamber (1301) is a rectangular parallelepiped structure; a mud outlet is arranged at the top of the mud and water chamber (1301); one side of the mud and water chamber (1301) is open, and the other side surfaces are sealed; the stirring roller (1302) is arranged at one side of the opening of the mud and water chamber (1301); the stirring roller (1302) is connected to the mud and water chamber (1301) as a whole; a motor is installed inside the stirring roller (1302); and a plurality of stirring racks (1303) are arranged on the stirring roller (1302); A fence is provided at one side of the opening of the mud and water chamber (1301), and the fence is provided with a vertical gap, and the stirring rack (1303) partially extends into the vertical gap of the fence.

3. A dredging and purification system according to claim 2, characterized in that: The sludge purification device (2) comprises a high-level water distribution ditch (21), a primary sedimentation ditch (22), a secondary sedimentation ditch (23), a filtering inclined bed (24), an ornamental ditch (25) and an oxygenating slope (26); The high-level water distribution ditch (21) is arranged at the upper part of the river bank, the high-level water distribution ditch (21) is arranged parallel to the river, a plurality of water inlets are arranged at the upper part of the high-level water distribution ditch (21), the plurality of water inlets are connected to the sludge pump (14) through a sludge discharge hose (15), the primary sedimentation ditch (22) is arranged downstream of the high-level water distribution ditch (21), the primary sedimentation ditch (22) is arranged parallel to the high-level water distribution ditch (21), the secondary sedimentation ditch (23) is arranged downstream of the primary sedimentation ditch (22), the secondary sedimentation ditch (23) is arranged parallel to the primary sedimentation ditch (22), the filtering inclined bed (24) is arranged downstream of the secondary sedimentation ditch (23), the filtering inclined bed (24) is arranged parallel to the secondary sedimentation ditch (23), the ornamental ditch (25) is arranged downstream of the filtering inclined bed (24), and the oxygenation slope (26) is arranged downstream of the ornamental ditch (25).

4. A dredging and purification system according to claim 3, characterized in that: The body of the high-level water distribution ditch (21) is made of concrete and environmentally friendly bricks. A cover plate is provided above the high-level water distribution ditch (21). A slope inclined toward the center of the river is provided at the bottom of the high-level water distribution ditch (21). A discharge port is provided at intervals of 1 to 5 meters at the lower end of the slope. A water level regulating plate is provided on the discharge port. A liquid medicine adding distributor is arranged inside the high-level water distribution ditch (21), and the liquid medicine inside the liquid medicine adding distributor is a flocculant.

5. A dredging and purification system according to claim 4, characterized in that: The channel body of the primary sedimentation ditch (22) is made of concrete and environmentally friendly bricks. A first seepage wall is provided on the side of the primary sedimentation ditch (22) close to the river. A first seepage board is arranged on the first seepage wall. The first seepage board is provided with holes. The first seepage board is made of hard plastic.

6. A dredging and purification system according to claim 5, characterized in that: The secondary ditch (23) can receive seepage water from the primary ditch (22); the channel body of the secondary ditch (23) is made of concrete and environmentally friendly bricks; a second seepage wall is provided on the side of the secondary ditch (23) close to the river; a second seepage board is arranged on the second seepage wall; holes are provided on the second seepage board; and the second seepage board is made of hard plastic.

7. A dredging and purification system according to claim 6, characterized in that: The filtering inclined bed (24) is capable of receiving seepage water from the secondary sedimentation ditch (23), and the filtering inclined bed (24) comprises a plain soil anti-seepage layer (2401), a filter material layer (2402), a soil planting layer (2403) and a filtering retaining wall (2404); The plain soil anti-seepage layer (2401) is arranged at the bottom of the filtering inclined bed (24), the filter material layer (2402) is arranged above the plain soil anti-seepage layer (2401), the soil planting layer (2403) is arranged above the filter material layer (2402), and the soil planting layer (2403) is planted with selected plants. The filtering retaining wall (2404) is arranged on the downstream side of the filtering inclined bed (24), the filtering retaining wall (2404) is made of concrete, and a plurality of drainage outlets are arranged in the wall of the filtering retaining wall (2404).

8. A dredging and purification system according to claim 7, characterized in that: The ornamental ditch (25) is a rectangular parallelepiped structure. A ditch wall is provided at one end downstream of the ornamental ditch (25). The height of the ditch wall is lower than the height of the filtering retaining wall (2404). Ornamental plants are planted in the ornamental ditch (25).

9. A dredging and purification system according to claim 8, characterized in that: The oxygenating slope (26) is an inclined wall structure, and the oxygenating slope (26) is connected to the ditch wall and the river bank at the downstream end of the ornamental ditch (25) as a whole. The wall structure of the oxygenating slope (26) is provided with a plurality of protrusions (2601).

10. A dredging and purification method, characterized in that: The following steps are involved: 1) Operate the lift (12) to lower the lift rod (1201) and the agitator (13) into the mud at the bottom of the ship, the motor inside the agitator roller (1302) drives the agitator roller (1302) to rotate, and the agitator rack (1303) agitates and mixes the mud and water, and the mud and water mixture enters the mud and water chamber (1301) through the gap of the fence, and the bulky objects are intercepted by the fence, and the mud and water mixture enters the high-level water distribution ditch (21) through the mud pump (14) and the mud discharge hose (15), and the liquid adding distributor adds flocculant, and the water level regulating plate adjusts the flow rate of the water discharged from the discharge port; 2) The muddy water mixed with the liquid medicine flows from the high-level water distribution ditch (21) into the primary sedimentation ditch (22), where the muddy water is precipitated and separated, and the clean water at the upper part of the primary sedimentation ditch (22) flows out through the first seepage wall and enters the secondary sedimentation ditch (23) for further sedimentation treatment, and the clean water at the upper part of the secondary sedimentation ditch (23) flows out through the second seepage wall; 3) Water from the second sedimentation ditch (23) enters the filtering inclined bed (24) through the second water seepage plate. Under the action of gravity, the water is filtered by the filter material layer (2402) of the filtering inclined bed (24) to produce filtrate. The plants planted on the soil planting layer (2403) absorb the pollutants in the leaching, and the pollutants are removed by harvesting the plants. 4) The filtrate flows through the drainage outlet of the filter retaining wall (2404) and enters the ornamental ditch (25). The ornamental ditch (25) produces a treatment effect of a plug-flow biochemical pool to biochemically treat the water. The ornamental plants planted in the water absorb pollutants in the water to biologically treat the water. 5) The water treated in the ornamental ditch (25) flows out from the outlet end and flows through the oxygenation slope (26). The protrusions (2601) on the oxygenation slope stir the water flow to form water splashes, aerate and oxygenate the water, and perform aerobic biochemical treatment on the water. The aerated and oxygenated water flows into the river, completing the water purification treatment; 6) When the sludge in the primary sedimentation ditch (22) and the secondary sedimentation ditch (23) accumulates to the designed height, water intake is stopped, the sludge is naturally dried, and then dug out for disposal.

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