CN109205935B

CN109205935B - Artificial wetland for river drainage outlet sewage interception treatment

Info

Publication number: CN109205935B
Application number: CN201811135824.4A
Authority: CN
Inventors: 徐勇; 张志兰; 王苏艳
Original assignee: Shanghai Zeyao Environmental Protection Technology Co ltd
Current assignee: Shanghai Zeyao Environmental Protection Technology Co ltd
Priority date: 2018-09-28
Filing date: 2018-09-28
Publication date: 2021-08-20
Anticipated expiration: 2038-09-28
Also published as: CN109205935A

Abstract

The invention relates to an artificial wetland for intercepting and treating sewage at a river drainage outlet, which comprises an intercepting and filtering net rack and an intercepting revolving door, wherein the intercepting and filtering net rack and the intercepting revolving door are enclosed with a river bank to form a sewage intercepting internal treatment space, the intercepting revolving door is opposite to the river bank drainage outlet, the intercepting and filtering net rack is of an inner-layer net rack structure and an outer-layer net rack structure, the periphery of the intercepting and filtering net rack is covered by a filter net cover, filtering fillers are filled in the intercepting and filtering net rack, aquatic plants are planted on the filtering fillers, and a plurality of biofilm culturing fillers, a plurality of slow-release carbon source supplementing pipes and a plurality of oxygen and phosphorus supplementing pipes are arranged in a water body of the sewage intercepting internal treatment space. The invention can realize the high-efficiency purification treatment of pollutants in the discharged water, effectively reduce the content of nitrogen and phosphorus organic pollutants in the discharged water, and simultaneously ensure the flood discharge capacity of the river discharge port.

Description

Artificial wetland for river drainage outlet sewage interception treatment

Technical Field

The invention belongs to the technical field of artificial wetland water purification, and particularly relates to an artificial wetland for river drainage port sewage interception treatment.

Background

As an important carrier of urban surface water resources, urban water not only plays a natural role in material and energy delivery, but also has the functions of water supply, flood discharge, waterlogging drainage, irrigation, shipping, landscape, tourism and the like. Due to the long-term development of high-speed economic society, many urban water bodies in China face the problems of serious eutrophication and even black and odorous water bodies. At present, with the gradual deepening of ecological civilization construction, the treatment of urban black and odorous riverways is gradually scheduled. The 'river growth system' is established in many cities to carry out ecological restoration on urban black and odorous water bodies. Practice shows that under the condition that the sewage outlet is completely intercepted, the ecological restoration of the urban black and odorous water body by adopting comprehensive means of physics, chemistry and biology is effective. Through ecological restoration, a plurality of urban black and odorous water bodies are effectively treated, and urban water ecology, water environment and water landscape are effectively recovered.

The pollution sources of the urban black and odorous water mainly come from urban centralized pipeline pollution discharge and surface source pollution discharge, and the so-called black and odorous reasons of the urban water basically belong to 'pollution in water and onshore root'. Therefore, the management department takes measures such as bank violation removal, pipeline dirt interception and the like around the riverway. It goes without saying that these measures are effective, greatly contributing to the reduction of pollutants entering urban waters. However, the practical background is that even after the pipeline sewage interception and the bank side dismantling are finished, the black and odorous and eutrophication phenomena of some urban water bodies are not obviously slowed down, even if various ecological restoration technologies are adopted for the urban water bodies, the ecological system of the water bodies is still difficult to restore to the level superior to V-type water, and large-area blue-green algae outbreaks and even the black and odorous phenomena of the water bodies still occur in high-temperature seasons in some riverways subjected to ecological restoration.

According to a large amount of engineering practices, the phenomenon is mainly caused by the fact that a large number of urban water bodies are difficult to achieve true sewage receiving and intercepting, and water body pollutants mainly enter a river channel through a rainwater pipeline. The pollution of urban water entering through a rainwater pipeline is difficult to maintain the long-term stability of the water quality of the river channel only by means of ecological restoration in the river channel. Therefore, the effective interception of the sewage discharge of the rainwater port in the river channel is realized, so that the amount of pollutants entering the water body through the rainwater port is in the purification capacity range of the ecological restoration of the river channel, and meanwhile, the flood discharge capacity of the rainwater port is not influenced, thereby being an important premise for realizing the ecological restoration of the black and odorous water body.

The undercurrent artificial wetland is very effective for repairing urban black and odorous water as a low-cost ecological water treatment technology, and the water is subjected to circulating treatment by constructing the bypass undercurrent artificial wetland on the bank during the repair of some black and odorous water, so that the water quality is effectively improved. The constructed wetland achieves the purpose of removing pollutants in water through the synergistic effect of physics, chemistry and biology of wetland plants, a medium filter bed and microorganisms.

Disclosure of Invention

The invention aims to provide an artificial wetland for intercepting and treating sewage at a river drainage outlet, which realizes efficient purification treatment of pollutants in drainage and ensures flood discharge capacity of the river drainage outlet.

The technical scheme adopted by the invention for solving the technical problems is to provide the artificial wetland for river drainage outlet sewage interception treatment, which comprises an interception filter net rack and an interception revolving door, wherein the interception filter net rack and the interception revolving door are enclosed with a river bank to form a sewage interception internal treatment space, the interception revolving door is opposite to the river bank drainage outlet, the interception filter net rack is of an inner-layer net rack structure and an outer-layer net rack structure, the periphery of the interception filter net rack is covered by a filter net cover, the interception filter net rack is internally filled with filter fillers, aquatic plants are planted on the filter fillers, and a plurality of biofilm fillers, a plurality of slow-release carbon source supplementing pipes and a plurality of oxygen-increasing phosphorus-locking supplementing pipes are arranged in a water body of the sewage interception internal treatment space.

An artificial floating island is arranged in a water body of the sewage interception internal treatment space, and the biofilm culturing filler, the slow-release carbon source supplementing pipe and the oxygen-increasing phosphorus-locking supplementing pipe are hung at the lower part of the artificial floating island.

The artificial floating island comprises a floating frame and pollution-resistant floating plants, wherein the pollution-resistant floating plants are planted on the floating frame.

The slow-release carbon source supplementing pipe and the oxygen-increasing phosphorus-locking supplementing pipe are respectively a filler pipe with an opening in the pipe wall and are hung below the artificial floating island through hanging buckles, the slow-release carbon source filled in the slow-release carbon source supplementing pipe is poly (butylene succinate) degradable plastic, and the slow-release oxygen-increasing phosphorus-locking agent filled in the oxygen-increasing phosphorus-locking supplementing pipe is calcium peroxide with the purity of more than 90%.

The width of the artificial floating island is smaller than that of the closure revolving door.

The intercepting filter net rack comprises a double-layer structural integral frame, a metal net and a plurality of corrosion sacrificial anodes, wherein the metal net is arranged on the side surface of the integral frame, and the intercepting filter net rack is in conductive connection with the corrosion sacrificial anodes.

The intercepting and filtering net rack is fixed on the river bank through expansion screws and steel wire ropes respectively.

When the closure revolving door is closed, the sewage closure internal treatment space is closed by self weight, and when the flood discharge is carried out, the sewage closure internal treatment space is opened by outwards overturning under the impact force of water flow.

The rotary gate dams includes door plant, pivot and bearing, the pivot sets up in the top of door plant and both ends respectively through the bearing rotationally install on the filtration rack that dams.

The filter filler in the intercepting and filtering net rack is sequentially arranged into a first-stage filter filler, a second-stage filter filler, a third-stage filter filler and a fourth-stage filter filler from bottom to top in a layered and graded mode through a filler basket, the filler particle size of the first-stage filter filler is 30-50 mm, the filler particle size of the second-stage filter filler is 10-30 mm, the filler particle size of the third-stage filter filler is 5-10 mm, and the filler particle size of the fourth-stage filter filler is 5-8 mm.

Advantageous effects

Firstly, sewage is intercepted and adsorbed and filtered through an intercepting and filtering net rack, a filtering net cover and filtering fillers, and then combined with the modes of aerobic biological contact oxidation, bottom anaerobic biological denitrification, oxygen enrichment phosphorus locking and aquatic plant absorption, organic pollutants such as nitrogen and phosphorus in a water body are subjected to combined efficient purification treatment, so that the content of solid suspended matters, particles and organic pollutants in the water body discharged into a river channel can be remarkably reduced, and the pollution condition of the river channel is favorably improved.

Secondly, under the condition that the water discharge of a river bank water outlet is normal, the intercepting water body is discharged to enter a river channel in a filtering mode and an overflow mode; when the water discharge exceeds a certain limit, the closure revolving door automatically opens by turning outwards under the impact force of water flow, so that the normal flood discharge capacity is ensured.

And thirdly, the artificial floating island can be moved out regularly to perform cleaning and material supplementing work, the nitrogen and phosphorus removal effect is enhanced, the sediment at the bottom of the sewage interception internal treatment space is convenient to clean, and facility maintenance is convenient.

Fourthly, the structures are masked by the artificial floating island and the aquatic plants, and a good landscaping effect can be achieved.

Drawings

Fig. 1 is a schematic top view of the present invention.

Fig. 2 is a schematic perspective view of the interception filter net rack of the present invention.

Fig. 3 is a schematic structural diagram of the artificial floating island of the present invention.

Fig. 4 is a graph of layered graded packing of the filter packing of the present invention.

Fig. 5 is a schematic structural view of the intercepting revolving door of the present invention.

FIG. 6 is a schematic structural view of the slow-release carbon source supplement tube according to the present invention.

FIG. 7 is a schematic structural view of the oxygen-increasing phosphorus-locking supplementary tube of the present invention.

Detailed Description

The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.

The constructed wetland for intercepting and treating the sewage at the drainage port of the river channel as shown in figure 1 comprises an intercepting and filtering net rack 1, an intercepting revolving door 2 and an artificial floating island 11. The interception filtering net rack 1, the interception revolving door 2 and the river bank 4 enclose to form a sewage interception internal treatment space, the interception revolving door 2 is right opposite to a river bank water outlet 5, and the area of the sewage interception internal treatment space is 9.6m². The artificial floating island 11 is arranged in the water body of the sewage interception internal treatment space.

As shown in fig. 2, the interception and filtration net rack 1 is an internal and external double-layer net rack structure, and comprises a double-layer structural integral frame 1-1, an iron metal net 1-2 and a plurality of corrosion sacrificial anodes 1-3. The integral frame 1-1 is made of galvanized steel pipes with the diameter D equal to 5cm, and the metal net 1-2 is an iron wire net with the mesh diameter D equal to 5mm and is arranged on the side surface of the integral frame 1-1. The corrosion sacrificial anode 1-3 is an aluminum alloy block, is connected with the iron metal net 1-2 through a copper wire, protects the iron wire net serving as the cathode in water and relieves corrosion. The periphery of the interception and filtration net rack 1 is covered by a filtration net cover 3, and the filtration net cover 3 is a nylon net with the mesh diameter D of 2-4 mm. The bottom of the intercepting and filtering net rack 1 is submerged in water, and the near bank end is fixed on a concrete bank protection of the bank 4 through a plurality of expansion rivets 12 and is fixed with the bank 4 through a steel wire rope.

The inside of the intercepting and filtering net rack 1 is filled with filtering fillers 6, and as shown in figure 4, the filtering fillers 6 are sequentially arranged in a layered and graded manner from bottom to top through filler baskets to form a first-stage filtering filler 6-1, a second-stage filtering filler 6-2, a third-stage filtering filler 6-3 and a fourth-stage filtering filler 6-4. The primary filtering filler 6-1 is a waste brick with the particle size of 30-50 mm, the secondary filtering filler 6-2 is a gravel filler with the particle size of 10-30 mm, the tertiary filtering filler 6-3 is an activated carbon filler with the particle size of 5-10 mm, and the quaternary filtering filler 6-4 is a zeolite filler with the particle size of 5-8 mm. For convenient disassembly and assembly, the filter filler 6 is directly sunk into the interception filter net rack 1 after being filled on the bank by adopting a grid filler basket matched with the interception filter net rack 1 in size. The top of the filter filler 6 is planted with the aquatic plant 7 calamus according to the ratio of 10-20 plants/m²And (5) planting.

As shown in fig. 5, the intercepting revolving door 2 includes a door panel 2-1, a rotating shaft 2-2, and a bearing 2-3. The rotating shaft 2-2 is fixed on the top of the door panel 2-1 through rivets, and two ends of the rotating shaft 2-2 are respectively and rotatably arranged on the intercepting and filtering net rack 1 through bearings 2-3. The revolving door 2 that dams relies on the dead weight to close the inside processing space that dams of sewage when damming, outwards overturns under rivers impact force during the flood discharge, opens the inside processing space that dams of sewage automatically. The width of the intercepting revolving door 2 is 2.3 m.

As shown in FIG. 3, the artificial floating island 11 comprises a floating frame 11-1 and pollution-resistant floating plants 11-2. The floating frame 11-1 is a square structure with the length and width of 2.1m and the enclosed area of 4.4m²The floating frame is made of a PVC pipe with the length D equal to 15cm, the connector is sealed, enough buoyancy is kept, and the floating frame 11-1 is fixed on a concrete revetment of the river bank 4 through a nylon rope, so that the floating frame is prevented from being damaged by impact of large water flow. Floating plants 11-2 watermifoil are cultivated in the floating frame 11-1, and the planting density is 30 plants/m². The width design of artificial floating island 11 is less than the width of revolving door 2 that dams, can conveniently shift out artificial floating island 11 and clean and the work of material replenishment, is convenient for clear up the deposit of sewage damming internal treatment space bottom.

A plurality of biofilm culturing fillers 8, a slow-release carbon source supplementing pipe 9 and an oxygen-increasing phosphorus-locking supplementing pipe 10 are hung below the artificial floating island 11. The biological biofilm culturing filler 8 can be constructed by adopting biological ropes, artificial aquatic weeds, plastic balls, plastic sheets and the like, the bottom is not fixed, and the biological biofilm culturing filler is required to have self-sinking capability to form a biological contact oxidation pond. As shown in fig. 6 and 7, the slow-release carbon source supplementing pipe 9 and the oxygen-increasing phosphorus-locking supplementing pipe 10 are filler pipes with openings on pipe walls, and are hung below the artificial floating island 11 by hanging buckles. The slow-release carbon source supplementing pipe 9 is filled with degradable plastic of Poly Butylene Succinate (PBS), and the oxygen-increasing phosphorus-locking supplementing pipe 10 is filled with calcium peroxide with the purity of more than 90% as a slow-release oxygen-increasing phosphorus-locking agent.

The operation process of the constructed wetland for the river drainage outlet sewage interception treatment comprises the following steps:

when non-rainfall or rainfall runoff is small, the water flow of the river bank water outlet 5 is small, the opposite closure revolving door 2 sinks and closes by self weight, and sewage discharged from the river bank water outlet 5 is collected in the sewage closure internal treatment space through the closure effect and is discharged after being purified. The treatment process comprises the following steps: the sewage discharged from the river bank water outlet 5 is firstly subjected to biological contact oxidation treatment at the lower part of the artificial floating island 11, denitrification at the bottom and oxygen and phosphorus enrichment at the upper part, nitrogen and phosphorus in the sewage are removed in an enhanced manner, and the concentration of organic matters in the sewage is reduced; then, the large-particle solid and the suspended matters in the waste water are removed through the further filtration of the filter screen 3 and the filter filler 6; finally, the wastewater is discharged after being absorbed and treated by wetland plants and floating island plants. And draining the drained water in a mode of filtering by the wetland filler and overflowing from the top of the wetland filler.

When rainfall runoff is large, the water yield of the river bank water outlet 5 is increased, the water flow impact force is increased, the closure revolving door 2 automatically turns upwards under the action of the water flow impact, rainwater is directly discharged to enter a river channel, and flood discharge in rainy seasons is not affected.

In the embodiment, tests are carried out for multiple times according to inlet and outlet water after three months of stable operation, the average concentrations of inlet water CODcr, ammonia nitrogen, TP and SS are respectively 200mg/L, 15mg/L, 2mg/L and 250mg/L, and the outlet water of the indexes is respectively 50mg/L, 3mg/L, 0.35mg/L and 25 mg/L. The artificial wetland is expected to need to be moved out of the artificial floating island 11 every year, and the internal space is subjected to dredging treatment once.

Claims

1. The utility model provides a constructed wetland that river course outlet sewage damps, its characterized in that: the novel sewage treatment device comprises an intercepting filter net rack (1) and an intercepting revolving door (2), wherein the intercepting filter net rack (1), the intercepting revolving door (2) and a river bank (4) are enclosed to form a sewage intercepting internal treatment space, the intercepting revolving door (2) is right opposite to a river bank water outlet (5), the intercepting filter net rack (1) is of an inner-outer double-layer net rack structure, the periphery of the intercepting filter net rack is covered by a filter net cover (3), the intercepting filter net rack (1) is filled with filter fillers (6), aquatic plants (7) are planted on the filter fillers (6), a plurality of biofilm fillers (8), a plurality of slow-release carbon source supplementing pipes (9) and a plurality of oxygen-increasing phosphorus-locking supplementing pipes (10) are arranged in a water body of the sewage intercepting internal treatment space, an artificial floating island (11) is arranged in the water body of the sewage intercepting internal treatment space, and the biofilm fillers (8), The slow-release carbon source supplementing pipe (9) and the oxygen-increasing phosphorus-locking supplementing pipe (10) are hung at the lower part of the artificial floating island (11).

2. The constructed wetland for intercepting and treating the sewage at the drainage port of the riverway according to claim 1, which is characterized in that: the artificial floating island (11) comprises a floating frame (11-1) and pollution-resistant floating plants (11-2), wherein the pollution-resistant floating plants (11-2) are planted on the floating frame (11-1).

3. The constructed wetland for intercepting and treating the sewage at the drainage port of the riverway according to claim 1, which is characterized in that: the slow-release carbon source supplementing pipe (9) and the oxygen-increasing phosphorus-locking supplementing pipe (10) are filling pipes with openings on pipe walls and are hung below the artificial floating island (11) through hanging buckles respectively, the slow-release carbon source filled in the slow-release carbon source supplementing pipe (9) is poly (butylene succinate) degradable plastic, and the slow-release oxygen-increasing phosphorus-locking agent filled in the oxygen-increasing phosphorus-locking supplementing pipe (10) is calcium peroxide with the purity of more than 90%.

4. The constructed wetland for intercepting and treating the sewage at the drainage port of the riverway according to claim 1, which is characterized in that: the width of the artificial floating island (11) is smaller than that of the closure revolving door (2).

5. The constructed wetland for intercepting and treating the sewage at the drainage port of the riverway according to claim 1, which is characterized in that: the intercepting and filtering net rack (1) comprises a double-layer structural integral frame (1-1), a metal net (1-2) and a plurality of corrosion sacrificial anodes (1-3), wherein the metal net (1-2) is arranged on the side surface of the integral frame (1-1), and the intercepting and filtering net rack (1) is in conductive connection with the corrosion sacrificial anodes (1-3).

6. The constructed wetland for intercepting and treating the sewage at the drainage port of the riverway according to claim 1 or 5, which is characterized in that: the intercepting and filtering net rack (1) is fixed on the river bank (4) through an expansion screw (12) and a steel wire rope respectively.

7. The constructed wetland for intercepting and treating the sewage at the drainage port of the riverway according to claim 1, which is characterized in that: when the closure revolving door (2) is closed, the sewage closure internal treatment space is closed by self weight, and the sewage closure internal treatment space is opened by outwards overturning under the impact force of water flow during flood discharge.

8. The constructed wetland for intercepting and treating the sewage at the drainage port of the riverway according to claim 7, which is characterized in that: the closure revolving door (2) comprises a door plate (2-1), a rotating shaft (2-2) and a bearing (2-3), wherein the rotating shaft (2-2) is arranged at the top of the door plate (2-1), and two ends of the rotating shaft are rotatably arranged on the closure filtering net rack (1) through the bearing (2-3) respectively.

9. The constructed wetland for intercepting and treating the sewage at the drainage port of the riverway according to claim 1, which is characterized in that: the filter filler (6) in the intercepting and filtering net rack (1) is sequentially arranged in a layered and graded manner from bottom to top through a filler basket into a first-stage filter filler (6-1), a second-stage filter filler (6-2), a third-stage filter filler (6-3) and a fourth-stage filter filler (6-4), wherein the filler particle size of the first-stage filter filler (6-1) is 30-50 mm, the filler particle size of the second-stage filter filler (6-2) is 10-30 mm, the filler particle size of the third-stage filter filler (6-3) is 5-10 mm, and the filler particle size of the fourth-stage filter filler (6-4) is 5-8 mm.