Water treatment device for river water

Abstract

The present application relates to a kind of water treatment device for river water area, including treatment pool body, the middle part of treatment pool body is first processing area, the water inlet of first processing area faces the upstream side of river channel;First processing area is equipped with second processing area on both sides respectively, the outside of each second processing area is equipped with third processing area, each processing area is parallel, the water body flow direction in first processing area and third processing area is same, the water body flow direction in first processing area and second processing area is opposite, the downstream end of third processing area is equipped with water outlet, all processing area is equipped with denitrification filler;First processing area is equipped with several first filler cage, second processing area is equipped with several second filler cage, third processing area is equipped with several third filler cage, the end of first filler cage is connected with the beginning of second filler cage, the end of second filler cage is connected with the beginning of first filler cage and the beginning of third filler cage, the end of third filler cage is connected with the beginning of second filler cage.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of river water treatment, and particularly relates to a water treatment device for river water. BACKGROUND

[0002] Because river water is always in a flowing state, conventional sewage treatment methods and agents can be rapidly diluted by river water, and improper use of the agents can further aggravate river water pollution, so the water treatment problem of river water has been a difficult problem in the field. SUMMARY

[0003] In view of the above problems, the application provides a water treatment device for river water, which comprises a treatment pool body, the treatment pool body is arranged on the bank of one side of the river, the middle part of the treatment pool body is a first treatment area, the water inlet of the first treatment area faces the upstream side of the river, and is used for introducing river water into the first treatment area; the two sides of the first treatment area are respectively provided with a second treatment area, and the outer side of each second treatment area is provided with a third treatment area, the first treatment area, the second treatment area and the third treatment area are parallel to each other, the water flow directions in the first treatment area and the third treatment area are the same, the water flow directions in the first treatment area and the second treatment area are opposite, the downstream end of the third treatment area is provided with a water outlet, and denitrification fillers are arranged in all the treatment areas; the river water flows through the first treatment area, the second treatment area and the third treatment area in sequence and is subjected to denitrification treatment.

[0004] A plurality of first filler cages are arranged in the first treatment area, a plurality of second filler cages are arranged in the second treatment area, and a plurality of third filler cages are arranged in the third treatment area, the end of the first filler cage is connected to the start of the second filler cage, the end of the second filler cage is connected to the start of the first filler cage and the start of the third filler cage in parallel, and the end of the third filler cage is connected to the start of the second filler cage, so that the denitrification fillers circulate between the filler cages, and the utilization rate of the fillers is improved.

[0005] Optionally, the treatment pool body is a cube, the water flow direction in the first treatment area is the same as the flow direction of the river, that is, the start of the first treatment area is close to the upstream side of the river, and the end of the first treatment area is close to the downstream side of the river, and the water inlet is arranged at the start of the first treatment area.

[0006] A first partition plate is arranged between the first treatment area and the second treatment area, a second partition plate is arranged between the second treatment area and the third treatment area, and the first partition plate and the second partition plate are parallel to the first treatment area; the two third treatment areas are respectively close to the two bank sides of the river.

[0007] Further optionally, the end of the first partition plate is spaced apart from the end of the first treatment area, so that a space is left, and the river water in the first treatment area flows into the second treatment area from the space.

[0008] The second partition has a spacing between the end of the second partition and the end of the second treatment area, leaving a space for the river water in the second treatment area to flow into the third treatment area.

[0009] Optionally, all the filler cages are cylindrical, the cage side wall is surrounded by a porous mesh, the filler cage is filled with denitrification filler, the central axes of all the filler cages are parallel to each other and parallel to the water flow direction of each treatment area, and the river water flows through the filler cage and contacts the denitrification filler to perform biochemical reaction, remove nitrate in the river water, and reduce total nitrogen in the river water.

[0010] Further optionally, the ends of the first filler cages in the first treatment area near the second treatment area on the left are respectively connected to the beginning ends of the corresponding second filler cages in the second treatment area on the left through first connecting channels; and the ends of the first filler cages in the first treatment area near the second treatment area on the right are respectively connected to the beginning ends of the corresponding second filler cages in the second treatment area on the right through second connecting channels.

[0011] Optionally, the end of the second treatment area is connected to the beginning of the first treatment area through a reflux pipe to return part of the water in the second treatment area to the first treatment area.

[0012] Further optionally, the ends of the second filler cages in the second treatment area on the left are connected in parallel to third connecting channels and fourth connecting channels, the third connecting channels are connected to the beginning ends of the corresponding third filler cages in the third treatment area on the left, and the fourth connecting channels are connected to the beginning ends of the first filler cages in the first treatment area through the reflux pipe.

[0013] The ends of the second filler cages in the second treatment area on the right are connected in parallel to fifth connecting channels and sixth connecting channels, the fifth connecting channels are connected to the beginning ends of the corresponding third filler cages in the third treatment area on the right, and the sixth connecting channels are connected to the beginning ends of the first filler cages in the first treatment area through the reflux pipe.

[0014] Further optionally, the ends of the third filler cages in the third treatment area are connected to the beginning ends of the corresponding second filler cages in the second treatment area near the third treatment area through seventh connecting channels.

[0015] Optionally, all the filler cages are provided with turnover plates, the turnover plate comprises a central rotating shaft and a spiral turnover plate, the central rotating shaft is parallel to the corresponding filler cage, the spiral turnover plate is single helical, uniformly wound along the length direction of the central rotating shaft, and adjacent plates have gaps to allow the filler to enter and exit the inside and outside of the spiral turnover plate; the spiral turnover plate is connected to the central rotating shaft through a plurality of connecting rods to fix the relative position of the spiral turnover plate and the central rotating shaft.

[0016] One end of the central rotating shaft penetrates one end of the corresponding filler cage, and is then connected to the inner wall of the corresponding treatment area. The other end of the central rotating shaft penetrates the other end of the corresponding filler cage, and is then connected to the corresponding motor to drive the spiral turning plate to rotate.

[0017] Optionally, the outer part of the filler cage is provided with a flow guide part, which includes a plurality of flow guide plates with curvature. The plurality of flow guide plates are uniformly distributed along the circumference of the corresponding filler cage. The flow guide plates protrude outward from the filler cage, so that the distance between the flow guide plates on both sides and the filler cage is less than the distance between the middle part of the flow guide plates and the filler cage. The side edges of adjacent flow guide plates have a spacing, so that a water passage is formed between the two side edges of adjacent flow guide plates. The flow guide plate is a mesh plate, which is uniformly covered with mesh holes for trapping river mud on both sides of the flow guide plate and filler residue discharged from the filler cage.

[0018] Further optionally, the length direction of the flow guide plate is parallel to the central axis of the filler cage, and the width direction of the flow guide plate is perpendicular to the length direction of the flow guide plate. The length and width of the flow guide plates around the same filler cage are the same. The ratio of the spacing between the side edges of adjacent flow guide plates to the width of the flow guide plate is 1:(3-6).

[0019] Optionally, four adjacent filler cages form a group. A stirring paddle is arranged in the center of each group of filler cages. The stirring paddle is parallel to the filler cage. One end of the stirring paddle is suspended, and the other end is connected to a driving motor to drive the stirring paddle to rotate. A plurality of blades are uniformly arranged around the stirring paddle. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The figure is a structural schematic diagram of the water treatment device for river water area.

[0021] Figure 2 The figure is a connection schematic diagram of the filler cage in the treatment pool body.

[0022] Figure 3 The figure is a structural schematic diagram of the turning plate.

[0023] Figure 4 The figure is a cooperation schematic diagram of the filler cage, flow guide plate, and stirring paddle.

[0024] In the drawings, 1 is a treatment pool body, 2 is a first treatment area, 3 is a second treatment area, 4 is a third treatment area, 5 is a first filler cage, 6 is a second filler cage, 7 is a third filler cage, 8 is a water inlet, 9 is a water outlet, 10 is a first partition plate, 11 is a second partition plate, 12 is a first connection channel, 13 is a second connection channel, 14 is a third connection channel, 15 is a fourth connection channel, 16 is a fifth connection channel, 17 is a sixth connection channel, 18 is a seventh connection channel, 19 is a stirring paddle, 20 is a central rotating shaft, 21 is a spiral turning plate, 22 is a flow guide plate, and 23 is a water passage. DETAILED DESCRIPTION

[0025] This embodiment provides a water treatment device for river waterways, such as... Figures 1-4 As shown, the system includes a treatment tank 1 located on the bank of a river. The middle part of the treatment tank 1 is a first treatment zone 2. The inlet 8 of the first treatment zone 2 faces the upstream side of the river and is used to introduce river water into the first treatment zone 2. Second treatment zones 3 are located on both sides of the first treatment zone 2. A third treatment zone 4 is located on the outside of each second treatment zone 3. The first treatment zone 2, second treatment zone 3 and third treatment zone 4 are parallel to each other. The water in the first treatment zone 2 and third treatment zone 4 flows in the same direction, while the water in the first treatment zone 2 and second treatment zone 3 flows in opposite directions. An outlet 9 is located at the downstream end of the third treatment zone 4. All treatment zones are equipped with denitrification packing. River water flows through the first treatment zone 2, second treatment zone 3 and third treatment zone 4 in sequence for denitrification treatment.

[0026] The first treatment zone 2 is equipped with several first packing cages 5, the second treatment zone 3 is equipped with several second packing cages 6, and the third treatment zone 4 is equipped with several third packing cages 7. The end of the first packing cage 5 is connected to the beginning of the second packing cage 6, the end of the second packing cage 6 is connected in parallel to the beginning of the first packing cage 5 and the beginning of the third packing cage 7, and the end of the third packing cage 7 is connected to the beginning of the second packing cage 6, so that the denitrification packing circulates between the packing cages, thereby improving the packing utilization rate.

[0027] Optionally, the treatment tank 1 is a cube, and the water flow direction in the first treatment zone 2 is the same as the flow direction of the river, that is, the beginning of the first treatment zone 2 is close to the upstream side of the river and the end is close to the downstream side of the river. The water inlet 8 is located at the beginning of the first treatment zone 2.

[0028] A first partition 10 is provided between the first treatment zone 2 and the second treatment zone 3, and a second partition 11 is provided between the second treatment zone 3 and the third treatment zone 4. Both the first partition 10 and the second partition 11 are parallel to the first treatment zone 2; the two third treatment zones 4 are respectively close to the two banks of the river.

[0029] In one specific implementation, the beginning of the second treatment zone 3 is close to the downstream side of the river channel, and the end is close to the upstream side of the river channel. The beginning of the second treatment zone 3 is used to receive river water from the first treatment zone 2. The beginning of the third treatment zone 4 is close to the upstream side of the river channel, and the end is close to the downstream side of the river channel. The beginning of the third treatment zone 4 is used to receive river water from the second treatment zone 3. Both ends of the second treatment zone 4 are provided with outlets 9. The beginning of the first partition 10 is close to the beginning of the first treatment zone 2, and the end of the first partition 10 is close to the end of the first treatment zone 2. The beginning of the second partition 11 is close to the beginning of the second treatment zone 3, and the end of the second partition 11 is close to the end of the second treatment zone 3.

[0030] Further, the first partition 10 has a space between its end and the end of the first treatment area 2, so that the river water in the first treatment area 2 flows into the second treatment area 3 from the space;

[0031] The second partition 11 has a space between its end and the end of the second treatment area 3, so that the river water in the second treatment area 3 flows into the third treatment area 4 from the space;

[0032] The width of the second treatment area 3 is equal to the width of the third treatment area 4, and the width of the first treatment area 2 is equal to twice the width of the second treatment area 3, so that the river water in the first treatment area 2 is divided into two second treatment areas 3, and then flows into the corresponding third treatment areas 4 from the second treatment areas 3, and finally flows out of the water outlet 9 of the two third treatment areas 4, that is, the produced water, and reflows into the river.

[0033] Optionally, the number of the second filler cages 6 in one second treatment area 3 is equal to the number of the third filler cages 7 in one third treatment area 4, and the number of the first filler cages 5 in the first treatment area 2 is equal to twice the number of the second filler cages 6 in one second treatment area 3.

[0034] All the filler cages are cylindrical, and the side walls of the cages are surrounded by porous mesh. The filler cages are filled with denitrification fillers. The central axes of all the filler cages are parallel to each other and parallel to the water flow direction of each treatment area. The river water flows through the filler cages and contacts the denitrification fillers to perform biochemical reactions, remove nitrate in the river water, and reduce the total nitrogen in the river water.

[0035] Further, the ends of the first filler cages 5 in the first treatment area 2 near one half of the second treatment areas 3 on the left side are respectively connected to the beginning ends of the corresponding second filler cages 6 in the second treatment areas 3 on the left side through the first connecting channels 12, and the ends of the first filler cages 5 in the first treatment area 2 near the other half of the second treatment areas 3 on the right side are respectively connected to the beginning ends of the corresponding second filler cages 6 in the second treatment areas 3 on the right side through the second connecting channels 13.

[0036] The first connecting channels 12 cross the first partitions 10 on the left side of the first treatment area 2 to enter the second treatment areas 3 on the left side, and the second connecting channels 13 cross the first partitions 10 on the right side of the first treatment area 2 to enter the second treatment areas 3 on the right side.

[0037] As a specific embodiment, the ends of the first filler cages 5 near the left side first partition 10 are connected to the beginning ends of the second filler cages 6 near the left side second partition 11, and the ends of the second filler cages 6 near the left side second partition 11 are connected to the beginning ends of the third filler cages 7 near the left side bank.

[0038] Optionally, the end of the second treatment area 3 is connected to the start of the first treatment area 2 through a reflux pipe, and part of the water in the second treatment area 3 is returned to the first treatment area 2.

[0039] Further optionally, the end of the second packing cage 6 in the left second treatment area 3 is connected to the start of the corresponding third packing cage 7 in the left third treatment area 4 through a third connecting channel 14, and is connected to the start of the first packing cage 5 in the first treatment area 2 through a fourth connecting channel 15.

[0040] The end of the second packing cage 6 in the right second treatment area 3 is connected to the start of the corresponding third packing cage 7 in the right third treatment area 4 through a fifth connecting channel 16, and is connected to the start of the first packing cage 5 in the first treatment area 2 through a sixth connecting channel 17.

[0041] The third connecting channel 14 crosses the second partition plate 11 on the left side of the second treatment area 3 to enter the left third treatment area 4, and the fifth connecting channel 16 crosses the second partition plate 11 on the right side of the second treatment area 3 to enter the right third treatment area 4.

[0042] Further optionally, the end of the third packing cage 7 in the third treatment area 4 is connected to the start of the corresponding second packing cage 6 in the adjacent second treatment area 3 through a seventh connecting channel 18, and the seventh connecting channel 18 crosses the second partition plate 11 to enter the second treatment area 3.

[0043] Further optionally, the first connecting channel 12, the second connecting channel 13, the third connecting channel 14, the fourth connecting channel 15, the fifth connecting channel 16, the sixth connecting channel 17 and the seventh connecting channel 18 are all in the shape of a cylinder, and the side wall is formed by a porous mesh.

[0044] The conventional denitrification packing in the pool body is in the form of a fixed bed, and the sewage flows through the packing bed layer, which may cause uneven flow, dead zones, channeling and the like, resulting in low utilization rate of the packing. The packing cages in the various treatment areas of the present application are connected to each other, and under the action of water flow, the packing particles can circulate between the various packing cages and contact river water of different pollution levels, so as to fully utilize the denitrification packing. The corresponding packing cages are uniformly arranged in each treatment area. The first treatment area 2 has a larger width and a larger number of first packing cages 5, which can process more river water, and then the river water treated by the first treatment area 2 flows into the two second treatment areas 3 respectively, and each second treatment area 3 receives half of the river water of the first treatment area 2; the river water treated by the second treatment area 3 flows into the corresponding third treatment area 4, and the river water treated by the third treatment area 4 is discharged into the downstream side of the river channel and flows into the river channel.

[0045] The specific filler flow circulation mode is as follows: the fillers in the first filler cage 5 are moved from the beginning end to the end of the first treatment area 2 under the action of water flow, and then pass through the first connecting channel 12 or the second connecting channel 13 according to the water flow, and the fillers are moved to the beginning end of the second filler cage 6, and then moved from the beginning end to the end of the second treatment area 3 under the action of water flow; at the end of the second treatment area 3, most of the river water pushes part of the fillers to the beginning end of the third filler cage 7 through the third connecting channel 14 or the fifth connecting channel 16, and a small part of the river water pushes another part of the fillers to the beginning end of the first filler cage 5 through the fourth connecting channel 15 or the sixth connecting channel 17 in the reflux pipe, and then moves in the first filler cage 5 again; the fillers in the third filler cage 7 are moved from the beginning end to the end of the third treatment area 4 under the action of water flow, and at the end of the third treatment area 4, the fillers are pushed to the beginning end of the second filler cage 6 through the seventh connecting channel 18 under the pushing of subsequent fillers and water, and then move in the second filler cage 6 again. Thus, the fillers in the treatment pool body 1 realize the circulation from the first filler cage 5 to the second filler cage 6, from the second filler cage 6 to the first filler cage 5, and from the third filler cage 7 to the second filler cage 6.

[0046] Optionally, the turning plate is arranged in all the filler cages, and the turning plate comprises a central rotating shaft 20 and a spiral turning plate 21; the central rotating shaft 20 is parallel to the corresponding filler cage; the spiral turning plate 21 is single-spiral-shaped and uniformly wound along the length direction of the central rotating shaft 20, and has a gap between adjacent plates to allow the fillers to enter and exit the inside and outside of the spiral turning plate 21; the spiral turning plate 21 is connected to the central rotating shaft 20 through a plurality of connecting rods to fix the relative position of the spiral turning plate 21 and the central rotating shaft 20.

[0047] One end of the central rotating shaft 20 penetrates one end of the corresponding filler cage, and the other end penetrates the other end of the corresponding filler cage, and then is connected to the inner wall of the corresponding treatment area to rotate, and the other end penetrates the other end of the corresponding filler cage, and then is connected to the corresponding motor to drive the spiral turning plate 21 to rotate. The motor can be arranged in the treatment pool body 1 or outside the treatment pool body 1.

[0048] Optionally, the inner wall of all the filler cages is uniformly and densely covered with bristles, and the bristles face the inside of the filler cage to clean the fillers close to the inner wall of the filler cage.

[0049] When the diameter of the filler cage is larger than the width of the corresponding treatment zone, the filler cage is equivalent to a filler bed, and channeling or dead zones can occur in the filler cage. In addition, if the amount of filler in the filler cage is small, the filler is carried by the river water, so that the same filler always treats the same river water, and the treatment efficiency of the filler decreases immediately when the treatment capacity of the filler decreases. If the amount of filler in the filler cage is large, the contact of the filler inside and outside the filler cage with the river water is uneven, and the filler cannot be fully utilized, and the driving force of the river water for the excessive filler is limited. In addition, the river water generally contains river mud, even if most of the river mud is filtered out in advance at the water inlet 8 of the treatment tank body 1, but the fine flocculent river mud can still enter the treatment tank body 1 and be filtered by the filler outside the filler cage, so that the part of the filler is prone to be blocked.

[0050] To solve the above problems, the present application provides a turnover plate in the filler cage. With the rotation of the spiral turnover plate 21, the filler in the filler cage is turned over, the filler inside is turned over to the outside, and the filler outside is turned over to the inside. In combination with the bristles on the inside of the filler cage, the filler turned over to the outside is cleaned during the movement of the filler particles, and the filler is cleaned in real time. In addition, the rotation of the spiral turnover plate 21 can also promote the formation of a spiral flow of the river water in the filler cage, which not only promotes the full contact of the river water with the filler, but also facilitates the movement of the filler to a new position driven by the spiral turnover plate 21, and can also carry out the river mud cleaned out of the filler cage.

[0051] Optionally, the outside of the filler cage is provided with a flow guide part, and the flow guide part comprises a plurality of flow guide plates 22 with an arc. The plurality of flow guide plates 22 are uniformly distributed along the circumference of the corresponding filler cage. The flow guide plate 22 protrudes outwardly from the filler cage, so that the distance between the two sides of the flow guide plate 22 and the filler cage is smaller than the distance between the middle of the flow guide plate 22 and the filler cage. The side edges of adjacent flow guide plates 22 have a spacing, so that a water inlet 23 is formed between the two side edges of adjacent flow guide plates 22. The flow guide plate 22 is a mesh plate, which is uniformly covered with mesh holes, and is used to intercept the river mud on both sides of the flow guide plate 22 and the filler residues cleaned out of the filler cage.

[0052] Further optionally, the length direction of the flow guide plate 22 is parallel to the central axis of the filler cage, and the width direction of the flow guide plate 22 is perpendicular to the length direction of the flow guide plate 22. The length of the flow guide plate 22 around the same filler cage is the same, and the width of the flow guide plate 22 is the same. The ratio of the spacing between the side edges of adjacent flow guide plates 22 to the width of the flow guide plate 22 is 1:(3-6).

[0053] The length of the flow guide plate 22 can be equal to the length of the corresponding filler cage, or can be smaller than the length of the corresponding filler cage. In other words, several flow guide plates 22 are arranged along the length direction of the filler cage, and adjacent flow guide plates 22 can have a certain spacing in the length direction of the filler cage.

[0054] Optionally, four adjacent filler cages are a group, and a stirring paddle 19 is arranged in the center of each group of filler cages, the stirring paddle 19 is parallel to the filler cages, one end of the stirring paddle 19 is suspended, the other end is connected to a driving motor to drive the stirring paddle 19 to rotate, and a plurality of blades are uniformly arranged around the stirring paddle 19.

[0055] The driving motor can be arranged in the treatment tank body 1 or outside the treatment tank body 1. According to the diameter, spacing and size of the corresponding treatment area of the filler cages in the same group, the number and size and shape of the blades are adjusted. The filler cages close to the side surface and the bottom surface of the treatment area, and the side of the filler cages facing the side surface or the bottom surface of the treatment area is not provided with the stirring paddle 19.

[0056] In the treatment of river water, some filler debris is generated by impact and wear of the denitrification filler, and the filler debris flows out of the filler cage with the rotation of the turnover plate and the scouring of the water flow. In addition, fine river mud in the river water also flows in and out of the filler cage. The stirring paddle 19 described in the present application is arranged in the center of the region between the four filler cages, plays a stirring role, and causes the river water in the region to diffuse to the guide plates 22 around under the action of the centrifugal force generated by stirring. Due to the blocking effect of the guide plates 22, the river water thrown out mainly enters the filler cage from the water inlet 23, and due to the special shape and arrangement of the guide plates 22, the space formed by the two adjacent guide plates 22 at the water inlet 23 is wide outside and narrow inside, and the flow rate of the river water passing through the water inlet 23 also gradually increases, which can offset the outward flow of the river water inside the filler cage and the guide plates 22, so that the river water inside the filler cage and the guide plates 22 flows outward after being filtered by the guide plates 22, and the filler debris and the river mud are intercepted by the guide plates 22, thereby forming the water flow form inside and outside the filler cage.

[0057] With the guide plates 22 as carriers and the filler debris as cores, under the action of the water flow, the flocculent river mud is wrapped outside the cores one by one, gradually grows, and forms granular biological carrier embryos. When the biological carrier embryos are large enough, they can be separated from the guide plates 22 and flow with the water flow, and can continue to load river mud and continue to grow. Through the design of the mesh aperture of the side wall of the filler cage, the large granular mature biological carrier embryos are prevented from entering the filler cage, and these biological carrier embryos eventually flow to the water outlet 9 with the water flow. The biological carrier embryos can be collected by filtration, and then used for the cultivation and biofilm formation of microorganisms to become biological carriers and applied to the biochemical treatment of other sewage. Microbial strains (such as aerobic microorganisms) can also be added in each treatment area to cultivate biological carriers in situ in the treatment tank body 1, intercept the biological carriers at the water outlet 9, and add the biological carriers back to the first treatment area 2 for biochemical treatment of river water.

[0058] The denitrification filler is a conventional autotrophic denitrification filler, such as the autotrophic denitrification filler particles provided in patent CN202311277231.2.

Claims

1. A water treatment device for river channels, characterized in that, The system includes a treatment tank located on one bank of the river. The central part of the treatment tank is the first treatment zone, with its inlet facing the upstream side of the river to introduce river water. Second treatment zones are located on either side of the first treatment zone, and a third treatment zone is located outside each of the second treatment zones. The first, second, and third treatment zones are parallel to each other. The water flow in the first and third treatment zones is in the same direction, while the water flow in the first and second treatment zones is in the opposite direction. An outlet is located at the downstream end of the third treatment zone. All treatment zones are equipped with denitrification packing. River water flows sequentially through the first, second, and third treatment zones for denitrification treatment. The first treatment zone contains several first packing cages, the second treatment zone contains several second packing cages, and the third treatment zone contains several third packing cages. The end of the first packing cage is connected to the beginning of the second packing cage, the end of the second packing cage is connected in parallel to the beginning of the first packing cage and the beginning of the third packing cage, and the end of the third packing cage is connected to the beginning of the second packing cage, so that the denitrification packing circulates among the packing cages, thereby improving the packing utilization rate.

2. The water treatment device for river channels according to claim 1, characterized in that, The treatment tank is cubic. The water flow direction in the first treatment zone is the same as the river flow direction. The beginning of the first treatment zone is close to the upstream side of the river, and the end is close to the downstream side of the river. The water inlet is located at the beginning of the first treatment zone. A first partition is provided between the first treatment zone and the second treatment zone, and a second partition is provided between the second treatment zone and the third treatment zone. Both the first and second partitions are parallel to the first treatment zone; the two third treatment zones are located close to the two banks of the river.

3. The water treatment device for river channels according to claim 2, characterized in that, There is a gap between the end of the first partition and the end of the first treatment area, leaving space so that the river water in the first treatment area flows into the second treatment area through this space; There is a gap between the end of the second partition and the end of the second treatment zone, leaving space for the river water in the second treatment zone to flow into the third treatment zone through this space. The end of the second treatment zone is connected to the beginning of the first treatment zone via a return pipe, returning a portion of the water in the second treatment zone to the first treatment zone.

4. The water treatment device for river channels according to claim 1, characterized in that, All the packing cages are cylindrical, with the side walls made of porous mesh. Each packing cage is filled with denitrification packing. The central axes of all the packing cages are parallel to each other and parallel to the water flow direction of each treatment zone. The river water flows through the packing cages, comes into contact with the denitrification packing, and undergoes a biochemical reaction to remove nitrates from the river water and reduce the total nitrogen in the river water.

5. The water treatment device for river channels according to claim 3, characterized in that, The ends of half of the first packing cages in the first processing area near the left side of the second processing area are respectively connected to the beginnings of the corresponding second packing cages in the left side of the second processing area through the first connecting channel; the ends of half of the first packing cages in the first processing area near the right side of the second processing area are respectively connected to the beginnings of the corresponding second packing cages in the right side of the second processing area through the second connecting channel.

6. The water treatment device for river channels according to claim 5, characterized in that, The end of the second packing cage in the second processing area on the left is connected to a third connecting channel and a fourth connecting channel in parallel. The third connecting channel is connected to the beginning of the corresponding third packing cage in the third processing area on the left, and the fourth connecting channel is connected to the beginning of the first packing cage in the first processing area through the return pipe. The end of the second packing cage in the second processing zone on the right is connected to the fifth and sixth connecting channels in parallel. The fifth connecting channel is connected to the beginning of the corresponding third packing cage in the third processing zone on the right, and the sixth connecting channel is connected to the beginning of the first packing cage in the first processing zone through the return pipe.

7. The water treatment device for river channels according to claim 6, characterized in that, The end of the third packing cage in the third processing zone is connected to the beginning of the corresponding second packing cage in the nearby second processing zone via a seventh connecting channel.

8. The water treatment device for river channels according to claim 1, characterized in that, All packing cages are equipped with a tilting plate, which includes a central rotating shaft and a spiral tilting plate. The central rotating shaft is parallel to the corresponding packing cage, and the spiral tilting plate is a single spiral shape, which is evenly wound along the length of the central rotating shaft. There are gaps between adjacent plates to allow the packing to enter and exit the interior and exterior of the spiral tilting plate. The spiral tilting plate is connected to the central rotating shaft by several connecting rods to fix the relative position of the spiral tilting plate and the central rotating shaft. One end of the central rotating shaft passes through one end of the corresponding packing cage and is then rotatably connected to the inner wall of the corresponding processing area. The other end passes through the other end of the corresponding packing cage and is then connected to the corresponding motor to drive the spiral flap to rotate.

9. The water treatment device for river channels according to claim 1, characterized in that, The outer side of the packing cage is provided with a flow guide section, which includes several curved flow guide plates. The flow guide plates are evenly distributed along the circumference of the corresponding packing cage. The flow guide plates protrude outward from the packing cage, so that the distance between the two sides of the flow guide plate and the packing cage is smaller than the distance between the middle of the flow guide plate and the packing cage. There is a gap between the sides of adjacent flow guide plates, so that a water passage is formed between the two sides of adjacent flow guide plates. The flow guide plate is a mesh plate with uniformly dense mesh holes, which is used to intercept river mud on both sides of the flow guide plate and the packing residue particles removed from the packing cage.

10. The water treatment device for river channels according to claim 1, characterized in that, Four adjacent packing cages form a group, and an agitator is set in the center of each group of packing cages. The agitator is parallel to the packing cage, with one end of the agitator suspended in the air and the other end connected to a drive motor to drive the agitator to rotate. Several blades are evenly arranged around the agitator.

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