Ecological treatment system for tail water of sewage plant

Abstract

The utility model discloses an ecological treatment system for tail water of a sewage plant. The ecological treatment system comprises an underflow ecological treatment system and a surface flow ecological treatment system, the tail water of the sewage plant sequentially passes through a first-stage water distribution channel, a first-stage subsurface flow wetland, a second-stage water distribution channel, a second-stage subsurface flow wetland, a water collection channel, a first-stage surface flow wetland and a second-stage surface flow wetland, a filler and a matrix are configured in an ecological purification system, and the tail water of the sewage plant is subjected to enhanced treatment by utilizing the synergistic effect of plants and microorganisms. The first-stage water distribution channel is communicated with a tail water discharge pipe of a sewage plant, and the second-stage surface flow wetland is communicated with a river channel through a drainage pipeline. According to the utility model, the tail water of the sewage plant is ecologically treated through the multi-stage constructed wetland, so that most of suspended matters in the tail water are removed, part of organic pollutants and NH3-N are reduced, the concentration of the pollutants in the tail water is effectively reduced, and the ecological environment of a river is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of environmental engineering, in particular to an ecological treatment system for tail water of a sewage plant. Background Art

[0002] Wastewater treatment plant tailwater can become an important source of recycled water, but its water quality is still Class V, and higher discharge standards are needed to achieve the goal of eliminating Class V water bodies. In addition, the nitrogen and phosphorus content in the Class A effluent standard is still relatively high, and there may be a risk of eutrophication when it is directly used for rivers, lakes, and urban landscape water.

[0003] Ecological wetland treatment technology uses the synergistic effect of plants and microorganisms to strengthen the treatment of tailwater from sewage treatment plants, achieving the removal of most suspended solids in sewage and the reduction of some organic pollutants and NH3-N. It has low operating costs, simple maintenance, good landscape effects, and good removal effects on conventional pollutants such as tailwater COD. It has great potential in tailwater treatment applications. Common artificial wetland types include surface flow and subsurface flow. The former is simple to operate and has low operating costs. The disadvantages are large land occupation, small hydraulic load, limited purification capacity, and easy breeding of mosquitoes in summer. The latter has good purification effects and less odor and mosquitoes, but the disadvantage is that the control is relatively complex.

[0004] Therefore, if we can utilize the advantages of different types of artificial wetlands and design an ecological treatment system for sewage plant tail water, we can achieve efficient purification of urban sewage plant tail water through plant absorption and microbial degradation, turning it into clean water and improving the water environment, which will be of great significance to the comprehensive utilization of water resources. Utility Model Content

[0005] In response to the problems raised by the background technology, the utility model provides an ecological treatment system for tail water of a sewage treatment plant, which combines subsurface flow artificial wetlands and surface flow artificial wetlands to give full play to their respective advantages, realize the purification treatment of tail water of the sewage treatment plant, help improve the water environment and realize the comprehensive utilization of water resources.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A sewage treatment plant tail water ecological treatment system comprises a water distribution channel, a subsurface flow ecological purification zone, a water collection channel and a surface flow ecological purification zone, wherein the water distribution channel is located between the subsurface flow ecological purification zones, the subsurface flow ecological purification zone is located at the front end of the surface flow ecological purification zone, the water distribution channel comprises a primary water distribution channel and a secondary water distribution channel, the subsurface flow ecological purification zone comprises a primary subsurface flow wetland and a secondary subsurface flow wetland, the surface flow ecological purification zone comprises a primary surface flow wetland and a secondary surface flow wetland, and the sewage treatment plant tail water passes through the primary water distribution channel, the primary subsurface flow wetland, the secondary water distribution channel, the secondary subsurface flow wetland, the water collection channel, the primary surface flow wetland and the secondary surface flow wetland in sequence.

[0008] Furthermore, the subsurface ecological purification area includes a water distribution pipe and a water collection pipe. The water distribution channel includes an inlet pipe, a valve is provided on the inlet pipe, the inlet pipe is connected to the water distribution pipe, and the water distribution pipe is a perforated pipe structure. The perforated pipe is used to distribute water to prevent short-flow or dead corners. The water collection pipe is connected to the next inlet pipe; the sewage is evenly distributed to the subsurface ecological purification area through the water distribution pipe.

[0009] Furthermore, the water inlet pipe in the first-level water distribution channel is connected to the water distribution pipe of the first-level submerged flow wetland, the water collecting pipe in the first-level submerged flow wetland is connected to the water inlet pipe of the second-level water distribution channel, the water inlet pipe of the second-level water distribution channel is connected to the water distribution pipe of the second-level submerged flow wetland, and the water collecting pipe of the second-level submerged flow wetland is connected to the water collecting channel through the water inlet pipe.

[0010] Furthermore, the sewage is distributed to the primary water distribution channel through the water inlet pipe with a valve, and then the sewage is evenly distributed to the primary subsurface wetland through the water distribution pipe; the sewage is distributed to the secondary water distribution channel through the water inlet pipe with a valve, and then the sewage is evenly distributed to the secondary subsurface wetland through the water distribution pipe; the sewage enters the water collection channel through the secondary subsurface wetland. Finally, the water collection channel is discharged into the surface flow ecological purification area through the drainage pipe.

[0011] Furthermore, the subsurface ecological purification area has a three-layer structure, including a planting layer, a middle ecological filling layer and a bottom anti-seepage layer.

[0012] Furthermore, the subsurface ecological purification area includes an inlet area, a main area and an outlet area; the inlet area is gravel or pebbles with a particle size of 50 to 80 mm; the main area is modified volcanic rock or zeolite filler with a particle size of 10 to 50 mm, and oxidizing fillers, reducing fillers, manganese oxidizing bacteria, etc. can also be added at the same time; the outlet area is gravel or pebbles with a particle size of 50 to 80 mm.

[0013] Furthermore, the subsurface ecological purification area is divided into a plurality of parallel cells, the aspect ratio of a single cell is less than 3:1, and the length is 20m to 50m.

[0014] Furthermore, an ecological floating island is provided in the surface flow ecological purification area, and the end of the surface flow ecological purification area is connected to the river through a drainage pipe. In addition, the surface flow ecological purification area can be equipped with emergent plants, floating plants and submerged plants according to different water depths to improve the processing capacity of the surface flow ecological purification system.

[0015] The utility model has the following beneficial effects:

[0016] The sewage is guided to the subsurface ecological purification area through the water distribution channel, so that the water flow can be evenly invested in the ecological purification system, thereby improving the treatment efficiency. The subsurface ecological purification area adopts a three-layer structure, including soil, ecological filler layer and anti-seepage layer. The above design helps to increase the contact area between sewage and microorganisms, improve the ecological purification effect, and effectively prevent sewage leakage. Dividing the subsurface ecological purification area into multiple parallel cells helps to improve the stability and fault tolerance of the treatment system, ensuring that the entire system can still operate normally even if some units fail. By setting up ecological floating islands in the surface flow ecological purification area, the diversity of the ecosystem is increased, the water quality treatment capacity is improved, and the terminal is connected to the river, realizing effective discharge of water bodies and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of a certain embodiment of the utility model.

[0018] Description of reference numerals:

[0019] 1. Primary water distribution channel; 2. Primary subsurface flow wetland; 20. Planting layer; 21. Water inlet area; 22. Filling layer; 23. Water outlet area; 24. Anti-seepage layer; 3. Secondary water distribution channel; 4. Secondary subsurface flow wetland; 5. Collection channel; 6. Primary surface flow wetland; 7. Secondary surface flow wetland; 8. Water inlet pipe; 9. Water distribution pipe; 10. Collection pipe; 11. Drainage pipe. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and technical features of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0021] In order to make the purpose, technical solution and technical features of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0022] like Figure 1As shown, a schematic diagram of the structure of an embodiment of an ecological treatment system for tail water of a sewage treatment plant of the utility model. The tail water ecological treatment system in this embodiment includes an undercurrent ecological purification zone and a surface flow ecological purification zone. The undercurrent ecological purification zone is located at the front end of the surface flow ecological purification zone, and the tail water of the sewage treatment plant passes through the primary water distribution channel 1, the primary undercurrent wetland 2, the secondary water distribution channel 3, the secondary undercurrent wetland 4, the water collection channel 5, the primary surface flow wetland 6 and the secondary surface flow wetland 7 in sequence.

[0023] The sewage is distributed to the primary water distribution channel 1 through the water inlet pipe 8 with a valve, and then evenly distributed to the primary subsurface wetland 2 through the perforated pipe. Then the water is distributed again through the secondary water distribution channel 3, and the sewage enters the water collection channel 5 through the secondary subsurface wetland 4, and then flows into the surface flow ecological purification area. The purified water is discharged into the river through the drainage pipe 11.

[0024] In this embodiment, the subsurface artificial wetland system includes a primary subsurface artificial wetland and a secondary subsurface artificial wetland. From top to bottom, a planting layer 20, a filler layer 22, and an anti-seepage layer 24 are provided. The anti-seepage layer 24 is graded sand and gravel with a particle size of 20 to 50 mm. Cold-resistant plants such as reeds, calamus, canna, etc. are planted on the planting layer 20. From left to right, there are an inlet area 21, a main area, and an outlet area 23.

[0025] In this embodiment, the water inlet area 21 is gravel or pebbles with a particle size of 50-80 mm; the main area is modified volcanic rock or zeolite filler with a particle size of 10-50 mm; the filler of the main area filler layer 22 includes: modified volcanic rock / zeolite filler, and oxidizing filler, reducing filler, manganese oxidizing bacteria, etc. are added at the same time. The specific filler thickness and filler ratio are determined according to the local frozen soil layer thickness and the water quality requirements of the inlet and outlet water. The water outlet area 23 is gravel or pebbles with a particle size of 50-80 mm.

[0026] The preferred thickness of the packing layer 22 in this embodiment is 1600 mm, and the packing particle size is 10-50 mm. The submerged flow ecological purification system is divided into a plurality of parallel cells, the aspect ratio of a single cell is preferably less than 3:1, and the length is preferably 20m-50m.

[0027] The surface flow ecological purification system of this embodiment uses ecological floating islands (not shown in the figure) for diversion, which can effectively prevent the occurrence of short circuits and dead zones. The surface flow ecological purification system is configured with emergent plants, floating plants and submerged plants according to different water depths to improve the processing capacity of the surface flow ecological purification system.

[0028] The utility model discloses a sewage treatment plant tail water ecological treatment system which combines subsurface flow artificial wetlands and surface flow artificial wetlands to give full play to their respective advantages and realizes the purification treatment of sewage treatment plant tail water. It has the advantages of simple structural design, high purification efficiency, low operating cost, etc., which is helpful to improve the water environment and realize the comprehensive utilization of water resources.

Claims

1. A sewage plant tailwater ecological treatment system, characterized in that: The invention comprises a water distribution channel, a subsurface ecological purification area, a water collection channel (5) and a surface flow ecological purification area. The water distribution channel is located between the subsurface ecological purification areas. The subsurface ecological purification area is located at the front end of the surface flow ecological purification area. The water distribution channel comprises a first-level water distribution channel (1) and a second-level water distribution channel (3). The subsurface ecological purification area comprises a first-level subsurface wetland (2) and a second-level subsurface wetland (4). The surface flow ecological purification area comprises a first-level surface flow wetland (6) and a second-level surface flow wetland (7). The tail water of the sewage treatment plant passes through the first-level water distribution channel (1), the first-level subsurface wetland (2), the second-level water distribution channel (3), the second-level subsurface wetland (4), the water collection channel (5), the first-level surface flow wetland (6) and the second-level surface flow wetland (7) in sequence.

2. The sewage plant tailwater ecological treatment system according to claim 1 is characterized in that: The subsurface ecological purification area comprises a water distribution pipe (9) and a water collection pipe (10), the water distribution channel comprises a water inlet pipe (8), a valve is provided on the water inlet pipe (8), the water inlet pipe (8) is connected to the water distribution pipe (9), the water distribution pipe (9) is a perforated pipe structure, and the water collection pipe (10) is connected to the next water inlet pipe (8); sewage is evenly distributed to the subsurface ecological purification area through the water distribution pipe (9).

3. The sewage plant tailwater ecological treatment system according to claim 2 is characterized in that: The water inlet pipe (8) in the primary water distribution channel (1) is connected to the water distribution pipe (9) of the primary subsurface wetland (2); the water collection pipe (10) in the primary subsurface wetland (2) is connected to the water inlet pipe (8) of the secondary water distribution channel (3); the water inlet pipe (8) of the secondary water distribution channel (3) is connected to the water distribution pipe (9) of the secondary subsurface wetland (4); and the water collection pipe (10) of the secondary subsurface wetland (4) is connected to the water collection channel (5) through the water inlet pipe (8).

4. The sewage plant tailwater ecological treatment system according to claim 1 is characterized in that: The subsurface ecological purification area has a three-layer structure, including a planting layer (20), a middle ecological filler layer (22), and a bottom anti-seepage layer (24).

5. The sewage plant tailwater ecological treatment system according to claim 1 is characterized in that: The subsurface ecological purification area comprises an inlet area (21), a main area and an outlet area (23); the inlet area (21) is filled with gravel or pebbles with a particle size of 50 to 80 mm; the main area is filled with modified volcanic rock or zeolite filler with a particle size of 10 to 50 mm; and the outlet area (23) is filled with gravel or pebbles with a particle size of 50 to 80 mm.

6. The sewage plant tailwater ecological treatment system according to claim 1 is characterized in that: The subsurface ecological purification area is divided into a plurality of parallel cells, the length-to-width ratio of a single cell is less than 3:1, and the length is 20m to 50m.

7. The sewage plant tailwater ecological treatment system according to claim 1 is characterized in that: An ecological floating island is provided in the surface flow ecological purification area, and the end of the surface flow ecological purification area is connected to the river through a drainage pipe (11).

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