CN210140519U

CN210140519U - Reclaimed water supply riverway system based on riverbank percolation

Info

Publication number: CN210140519U
Application number: CN201920459550.8U
Authority: CN
Inventors: 和泽康; 宋献方; 杨丽虎; 马英; 韩冬梅; 李炳华
Original assignee: Institute of Geographic Sciences and Natural Resources of CAS
Current assignee: Institute of Geographic Sciences and Natural Resources of CAS
Priority date: 2019-04-08
Filing date: 2019-04-08
Publication date: 2020-03-13
Anticipated expiration: 2029-04-08

Abstract

The utility model provides a reclaimed water supply riverway system based on riverside infiltration, which comprises a riverside infiltration-biological treatment unit, wherein one side of the riverside infiltration-biological treatment unit, which is far away from a riverway, is a vertical impermeable layer, one side of the riverway, which is close to the riverway, is paved with slope protection bricks, and an organic pollutant high-efficiency removal layer, an anti-nitrification layer and an aerobic nitrification layer are sequentially arranged between the slope protection bricks and the vertical impermeable layer from bottom to top; wherein: the aerobic nitrification layer comprises a first multifunctional pipe, and gravel and modified zeolite which are laid in a mixed mode; the denitrification layer comprises a second multifunctional pipe and ceramsite, volcanic rock and iron-coated quartz sand which are symmetrically arranged from outside to inside; the organic pollutant high-efficiency removal layer comprises a third multifunctional pipe and gravel and modified zeolite which are paved in a mixed mode. The utility model discloses can prevent the emergence of reclaimed water supply river course eutrophication phenomenon, reduce the groundwater pollution risk who receives the reclaimed water supply.

Description

Reclaimed water supply riverway system based on riverbank percolation

Technical Field

The utility model relates to a sewage treatment field especially relates to a reclaimed water supply river course system based on river bank infiltration.

Background

With the population growth and the rapid economic development of China, the demand on water resources is gradually increased, the water resource situation is increasingly severe, and rivers in the north are frequently cut off, so that a series of ecological environment problems such as water pollution, ecological environment degradation and the like are caused. The water body which meets certain use requirements after the sewage generated in production and life is treated is called as 'regenerated water'. The reclaimed water has great utilization potential and becomes a reliable and stable water source for maintaining the ecological water demand of the northern river. The reclaimed water is used as a novel urban water supply source and has wide application, such as agricultural irrigation, environmental landscape, industrial, municipal water and groundwater recharge. Among them, environmental landscape water is one of the most important uses of reclaimed water. In 2016, the utilization amount of the reclaimed water in Beijing city reaches 10.0 hundred million m³In one year, 88% of the regenerated water is used for replenishing water in rivers and lakes.

However, due to the limitation of the treatment process, the overproof nitrogen and phosphorus in the regenerated water is serious, so that the eutrophication phenomenon frequently occurs in the riverway supplemented by the regenerated water. And some of the new organic contaminants in the reclaimed water, such as endocrine disrupting Chemicals, pharmaceuticals and personal care products (pharmaceutical and personal careproducts), cannot be completely removed. Endocrine disruptors, however, are hazardous at very low concentrations and can interfere with the endocrine and reproductive systems by binding to intracellular estrogen receptors, producing a pseudoestrogenic or antiestrogenic effect, causing environmental ecological and human health risks. Therefore, the method is particularly important for further improving the water quality of the riverway supplemented by the regenerated water.

The current water pollution treatment technology of landscape water mainly comprises the following steps: ecological floating island technology, coagulating sedimentation technology, biological contact oxidation method and artificial wetland. The ecological floating island is a water surface planting technology which applies a high polymer material as a floating carrier and takes the high polymer material as a planting mechanism. However, the ecological floating island has complex process, relatively high cost, easy damage and inconvenient operation management on water, and simultaneously, the dissolved oxygen in the water body is reduced because the floating body material is air-insulated and heat-insulated. Coagulating sedimentation refers to the treatment of suspended solids, colloidal matter and algae with a coagulant. However, the optimal dosage of the coagulating sedimentation technology is difficult to determine, and secondary pollution is caused to a water body when excessive dosage is added. Biological contact oxidation is to degrade organic pollutants in water by using the metabolism of microorganisms, but the method is easy to block the filler when the pollution load is higher. The artificial wetland is an ecological system for deeply treating sewage, which is constructed artificially and operated under control. However, the artificial wetland occupies a large area and is easy to block, so that the permeability coefficient of the substrate is rapidly reduced, the water passing capacity is reduced, the odor is caused, oxygen is difficult to diffuse into the substrate by sewage, the treatment effect is influenced, and the service life of the wetland is shortened.

In northern China, the reclaimed water is mainly used for supplying dried river channels. In the rich water period, the regenerated water and the rainwater are supplied to the river channel together, and in the dry water period, the river channel is mainly supplied by the regenerated water. On the one hand, the concentrated rainwater is supplied, the flow of the river channel is increased, the regenerated water in the river channel is diluted, and the self-purification capacity of the river channel is improved. On the other hand, the rainwater pollutant concentration is higher in the early rainfall stage, and the formed surface runoff is easy to cause non-point source pollution to the river channel.

Therefore, a system and a method for replenishing the regenerated water into the river channel are lacked at present, wherein the system and the method can efficiently remove nutrient salts such as nitrogen (N), phosphorus (P) and novel organic pollutants in the regenerated water before the regenerated water enters the river channel, simultaneously weaken non-point source pollution of surface runoff in the early stage of rainfall on the river channel, and effectively benefit dilution and purification of the rainfall on the river channel.

SUMMERY OF THE UTILITY MODEL

The features and advantages of the present invention are set forth in part in the description which follows, or may be obvious from the description, or may be learned by practice of the invention.

In order to overcome the problems of the prior art, the utility model provides a reclaimed water replenishing riverway system based on riverway percolation, which comprises a riverway percolation-biological treatment unit, wherein one side of the riverway percolation-biological treatment unit, which is far away from a riverway, is a vertical impermeable layer, one side of the riverway percolation-biological treatment unit, which is close to the riverway, is paved with slope protection bricks, and an organic pollutant high-efficiency removal layer, an anti-nitration layer and an aerobic nitration layer are sequentially arranged between the slope protection bricks and the vertical impermeable layer from bottom to top; wherein:

the aerobic nitrification layer comprises a first multifunctional pipe and gravel and modified zeolite which are laid in a mixed mode, one end of the first multifunctional pipe extends into the atmosphere, and the other end of the first multifunctional pipe extends into the gravel and the modified zeolite which are laid in the mixed mode;

the anti-nitration layer comprises a second multifunctional pipe, and ceramsite, volcanic rock and iron-coated quartz sand which are symmetrically arranged from outside to inside, wherein one end of the second multifunctional pipe is provided with a sealing cover, and the other end of the second multifunctional pipe is positioned in the ceramsite, the volcanic rock and the iron-coated quartz sand which are symmetrically arranged from outside to inside;

the organic pollutant high-efficiency removal layer comprises a third multifunctional pipe and gravel and modified zeolite which are mixed and paved, wherein one end of the third multifunctional pipe extends into the atmosphere, and the other end of the third multifunctional pipe extends into the gravel and the modified zeolite which are mixed and paved.

Optionally, the regenerated water replenishing riverway system based on river bank percolation comprises a regenerated water replenishing unit, the regenerated water replenishing unit comprises a regenerated water replenishing channel arranged above the aerobic nitrification layer and a biofilm culturing combined filler plate arranged in the regenerated water replenishing channel, and the regenerated water replenishing channel is made of a permeation wall and is provided with an overflow port.

Optionally, a plurality of fixing rods are buried at the bottom of the reclaimed water replenishing channel, and the biofilm culturing combined filler plate is fixed between the fixing rods through an elastic rope.

Optionally, the reclaimed water replenishing riverway system based on river bank infiltration comprises a rainwater purification unit, wherein the rainwater purification unit comprises a rainwater purification tank and a partition plate arranged in the rainwater purification tank, and the rainwater purification tank is connected with the reclaimed water replenishing channel through a communicating pipe.

Optionally, a second electromagnetic valve is arranged on the communicating pipe.

Optionally, the reclaimed water replenishing riverway system based on river bank infiltration comprises a rainwater discarding and collecting unit, the rainwater discarding and collecting unit comprises a rainwater collecting greenbelt and a rainwater discarding cavity, the rainwater collecting greenbelt sequentially comprises a soil layer, a river sand layer and an impermeable layer from top to bottom, a rainwater collecting pipe network is arranged in the river sand layer, the rainwater collecting pipe network is connected with the rainwater discarding and collecting cavity, and the bottom of the rainwater discarding and collecting cavity is connected with a municipal sewage pipe network.

Optionally, a first electromagnetic valve is arranged between the rainwater collection pipe network and the rainwater discarding cavity, the first electromagnetic valve is connected with a rainwater discarding device through a lead, and the rainwater discarding device is arranged on the rainwater collection green land and used for opening the first electromagnetic valve when the rainfall is smaller than a preset value.

Optionally, an overflow channel is formed between two adjacent slope protection bricks.

The utility model provides a reclaimed water supply river course method based on bank infiltration, include:

enabling the regenerated water to enter an aerobic nitrification layer, adsorbing ammonia nitrogen in the regenerated water through the gravels and the modified zeolite in the aerobic nitrification layer, and converting the ammonia nitrogen into nitrate nitrogen by nitrifying bacteria on the gravels and the modified zeolite;

enabling the reclaimed water to enter a denitrification layer, adsorbing phosphorus in the reclaimed water through ceramsite, volcanic rock and iron-coated quartz sand, and converting nitrate nitrogen into nitrogen gas by denitrifying bacteria on the ceramsite, volcanic rock and iron-coated quartz sand to be discharged;

the regenerated water enters the organic pollutant high-efficiency removal layer, adsorbs the organic pollutants through the gravels and the modified zeolite and is degraded by the dominant flora on the gravels and the modified zeolite.

Optionally, at least one of:

dominant nitrobacteria are put in through a first multifunctional pipe communicated with the aerobic nitrification layer;

dominant denitrifying bacteria are put in through a second multifunctional pipe communicated with the denitrifying layer;

organic matter dominant degradation bacteria are put in through a third multifunctional pipe of the organic pollutant high-efficiency removal layer.

The utility model provides a reclaimed water supply river course system based on bank infiltration makes the reclaimed water at bank top moisturizing, through bank infiltration-biological treatment unit, effectively gets rid of nitrogen, phosphorus in the reclaimed water and has the pollutant, advances further advanced treatment at the reclaimed water entering river course, prevents the emergence of reclaimed water supply river course eutrophication phenomenon. The oxygen content of the water body in the river is further increased, thereby being beneficial to the natural self-purification process in the river and greatly reducing the pollution risk of the groundwater supplemented by the reclaimed water.

The features and content of these solutions will be better understood by those skilled in the art from reading the present description.

Drawings

The advantages and mode of realisation of the invention will become more apparent hereinafter by describing in detail the invention with reference to the attached drawings, wherein the content shown in the drawings is only for explaining the invention, without constituting any limitation to the meaning of the invention, in which:

fig. 1 is the embodiment of the utility model provides a regenerated water supply watercourse single system's based on bank slope filtration section structure sketch map.

Fig. 2 is the utility model provides a planar structure schematic diagram of the reclaimed water supply river course system based on bank slope infiltration.

Fig. 3 is the embodiment of the utility model provides a slope protection brick top view.

FIG. 4 is a slope protection brick A-A shown in FIG. 3⁰Sectional structure diagram.

FIG. 5 shows the slope protection bricks B-B shown in FIG. 3⁰Sectional structure diagram.

FIG. 6 is a slope protection brick C-C shown in FIG. 3⁰Sectional structure diagram.

Fig. 7 is a top view of a slope protection brick provided by another embodiment of the present invention.

In the above figures: 1-a reclaimed water replenishing canal, 2-an overflow section, 3-an aerobic nitrification section, 4-a denitrification section, 5-an organic pollutant high-efficiency removing section, 6-a river channel, 7-a vegetation isolation section, 8-a rainwater collecting greenbelt, 9-a third multifunctional pipe, 10-a second multifunctional pipe, 11-a first multifunctional pipe, 12-a reclaimed water discharging pipe, 13-a rainwater inlet, 14-a rainwater outlet, 15-an isolation plate, 16-a rainwater purification tank, 17-an elastic rope, 18-a fixed rod, 19-a biological hanging film combined filler plate, 20-a small-pore connecting plate, 21-a solid connecting plate, 22-a connecting plate groove, 23-an overflow groove, 24-shrub, 25-a ground cover plant and 26-an aquatic plant, 27-fixed piles, 28-trees, 29-semi-cylindrical outflow pipes, 30-novel slope protection bricks, 31-soil bottom mud composite backfill layers, 32-filter screens, 33-rainwater discarding devices, 34-soil layers, 35-rainwater collection pipe networks, 36-river sand layers, 37-gravels, 38-modified zeolite, 39-ceramsite, 40-iron-coated quartz sand, 41-permeable walls, 42-communicating pipes, 43-preliminary sedimentation tanks, 44-water collecting tanks, 45-impermeable layers, 46-municipal sewage pipe networks, 47-overflow ports, 48-grid covers, 49-sealing covers, 50-porous connecting plates, 51-impermeable layers, 52-second battery valves, 53-first battery valves, 54-greenbelt and 55-conducting wires, 56-rainwater abandon cavity, 57-volcanic rock.

Detailed Description

As shown in fig. 1 and 2, the utility model provides a reclaimed water replenishing riverway system based on river bank infiltration, which comprises a rainwater discarding and collecting unit, a rainwater purifying unit, a reclaimed water replenishing unit and a river bank infiltration-biological treatment unit.

The rainwater discarding and collecting unit comprises a vegetation isolation section 7, a rainwater discarding device 33, a rainwater collecting greenbelt 8, a lead 55, a first electromagnetic valve 52, a second electromagnetic valve 53 and a rainwater discarding cavity 56.

The vegetation isolation section 7 is composed of a soil layer 34 and a tree 28. The stratum at the lower part of the vegetation isolation section 7 is an undisturbed river bank soil layer 34, the arbor 28 is planted at the upper part of the vegetation isolation section 7, and the surface runoff can be intercepted for the first time by the vegetation isolation section 7. The rainwater collection green land 8 consists of a soil layer 34, a river sand layer 36, a green land 54, an impermeable layer 45 and a rainwater collection pipe network 35.

The vegetation isolation section 7 is close to river bank one side and collects greenery patches 8 for the rainwater, and its upper portion of greenery patches is soil horizon 34 is collected to the rainwater, plants greenery patches 54 on the soil horizon 34, and the lower part is river sand layer 36, has buried rainwater in the river sand layer 36 and has collected pipe network 35, and river sand layer 36 lower part is barrier layer A45, prevents that the rainwater from directly permeating the underground. Collect pipe network 35 end-to-end connection rainwater at the rainwater and abandon a class chamber 56, the utility model discloses well rainwater abandons class chamber 56 and just prevents that the rainwater from directly getting into rainwater purification tank 16, and its volume is abandoned class irrelevantly with when, and rainwater abandons class chamber 56 and prevents seepage all around, and the rainwater is abandoned class chamber 56 sub-unit connection urban sewage pipe network 46. A first electromagnetic valve 52 is arranged between the rainwater collecting pipe network 35 and the rainwater abandoning cavity 56. The first electromagnetic valve 52 is connected with the rainwater discarding device 33 through a lead 55, the rainwater discarding device 33 is arranged at the upper part of the rainwater collection green land 8, the first electromagnetic valve 52 can be controlled through rainfall, and when the rainfall is less than 2mm, the first electromagnetic valve 52 is opened, so that rainwater with high initial pollutant content is discarded and discharged into the urban sewage pipe network 46 for unified treatment. When the rainfall is greater than 2mm, the first electromagnetic valve 52 is closed, and the rainwater enters the rainwater purification unit through the rainwater inlet 13.

The rainwater purification unit comprises a rainwater purification pool 16, a separation plate 15, a filter screen 32 and an impermeable layer 45. The length, width and height of the rainwater purification tank are 2m, for example, the periphery of the rainwater purification tank is provided with an impermeable layer 45, and the upper part of the rainwater purification tank is provided with an opening. The middle part of the rainwater purification tank 16 is provided with a separation plate 15, one side of the baffle, which is far away from the river channel, is a pre-settling tank 43, and one side, which is close to the river channel, is a water collecting tank 44. Rainwater enters the rainwater pre-settling tank 43, is precipitated and then enters the water collecting tank 44, a rainwater outlet 14 is formed in one side, close to a river channel, of the water collecting tank, and the filter screen 32 is installed on the rainwater outlet 14. The rainwater purification tank is connected with the reclaimed water replenishing channel 1 through a communicating pipe 42, a second electromagnetic valve 53 is arranged on the communicating pipe, and the second electromagnetic valve 53 is connected with the rainwater flow discarding device 33 through a lead 55. When the rainfall is less than 2mm, the reclaimed water replenishing channel 1 is not in hydraulic connection with the rainwater purification tank 16. When the rainfall is greater than 2mm, the second electromagnetic valve 53 is opened, and the rainwater which is subjected to initial flow discarding and sedimentation can enter the reclaimed water replenishing channel 1 through the communicating pipe 42.

The reclaimed water replenishing unit comprises a reclaimed water replenishing channel 1, a biological film-hanging combined filler plate 19, a fixing rod 18, an elastic rope 17 and a reclaimed water discharging pipe 12. The reclaimed water replenishing channel 1 is positioned above the aerobic nitrification layer 3, the periphery of the reclaimed water replenishing channel is provided with a permeable wall 41, the upper part of the reclaimed water replenishing channel is provided with an opening, and the width and the height of the reclaimed water replenishing channel can be respectively 1 m. The reclaimed water replenishing channel 1 can be arranged on the top of the river bank at one side or two sides of the river channel according to the reclaimed water replenishing quantity. The regenerated water discharge pipe 12 is communicated with the regenerated water replenishing channel 1, and the regenerated water generated by non-rainfall can be directly discharged into the regeneration channel through the regenerated water discharge pipe 12.

Fixing rods 18 are buried at the bottom of the reclaimed water replenishing channel, and a biofilm culturing combined filler plate 19 is fixed between the fixing rods 18 through an elastic rope 17. A large number of microorganisms are attached to the biofilm culturing combined filler plate 19, N, P and organic matters can be degraded preliminarily, and the biofilm culturing combined filler plate 19 can be detached conveniently, so that the biofilm culturing combined filler plate 19 is subjected to uniform backwashing recycling. The reclaimed water replenishing channel 1 is provided with overflow ports 47 every 50cm at one side close to the river channel 6, the overflow ports 47 are 10cm wide and 10cm high, when rainfall is converged into the reclaimed water replenishing channel 1, and the replenishing speed of reclaimed water and rainwater in the reclaimed water replenishing channel 1 is higher than the infiltration speed, the rainwater with reduced pollutant content and the mixed water body of the reclaimed water flow into the overflow groove 23 through the overflow ports 47, so that the rainwater is converged into the river channel 6.

The river bank percolation-biological treatment unit comprises an aerobic nitrification layer 3, a denitrification layer 4, an organic pollutant high-efficiency removal layer 5, an overflow section 2 and a fixing pile 27. One side of the river bank percolation-biological treatment unit, which is far away from the river channel 6, is a vertical impermeable layer, the bottom of the unit is provided with an impermeable layer 51, one side of the unit, which is near to the river channel 6, is provided with a slope protection brick 30 which is laid at a certain angle with the horizontal direction, a fixing pile 27 is arranged at the junction of the slope protection brick 30 and the bottom layer of the river channel 6, the fixing pile 27 can be a wood pile with the diameter of 20cm and the length of 70cm, and the fixing pile 27 is inserted into the river channel to fix the slope protection brick. An organic pollutant high-efficiency removal layer 5, a denitrification layer 4, an aerobic nitrification layer 3 and an overflow section 2 are sequentially arranged between the slope protection brick 30 and the vertical impermeable layer from bottom to top. The overflow section 2 is composed of slope protection bricks 30 and shrubs 24. The slope protection brick 30 is filled with a soil bottom mud composite backfill layer 31, and shrubs 24 are planted on the soil bottom mud composite backfill layer 31.

Gravel 37 with the diameter of 2-10cm and modified zeolite 38 with the diameter of 1-5cm are mixed and paved in the aerobic nitrification layer 3, and the gravel 37 can play a good supporting role, so that the connectivity of the aerobic nitrification layer 3 is increased, and the oxygen content is increased; the modified zeolite 38 has large specific surface area and strong ammonia nitrogen adsorption capacity, thereby increasing the retention time of ammonia nitrogen in the aerobic nitrification layer 3. And a large amount of biomembranes are arranged on the surfaces of the gravels 37 and the modified zeolite 38, so that high-efficiency aerobic nitrification is performed.

The aerobic nitrification layer 3 comprises a first multifunctional pipe 11, and in this embodiment, the first multifunctional pipe 11 is vertically arranged on the side far away from the river channel 6. One end of the first multifunctional pipe 11 is extended into the atmosphere, and the other end is extended into the gravel and modified zeolite which are mixed and laid. In specific implementation, the first multifunctional pipe 11 may be a PVC pipe with a diameter of 20cm and a thickness of 1cm, the first multifunctional pipe 11 extends into the middle of the aerobic nitrification layer 3, the first multifunctional pipe 11 is provided with a plurality of vent holes with a diameter of 0.5cm, and the upper part of the first multifunctional pipe 11 is provided with the grid cover 48. The grid cover 48 is a dense grid-like circular cover made of stainless steel with a diameter of 22cm, and can be buckled on the top of the first multifunctional pipe 11 to prevent impurities from falling into the first multifunctional pipe 11. The first multifunctional tube 11 has three main functions: firstly, dominant nitrobacteria can be put into the first multifunctional pipe 11, the multifunctional pipe is arranged in the upstream direction of water flow in the river bank percolation unit, the nitrobacteria can be distributed in the whole aerobic nitrification layer 3 along with the water flow, and the nitrification of the aerobic nitrification layer 3 is enhanced; secondly, the aerobic nitrification layer 3 can be periodically back-flushed by a back-flushing liquid; thirdly, the first multifunctional pipe 11 is the same as the atmosphere, so that the oxygen of the aerobic nitrification layer 3 can be increased, and the nitrification efficiency is increased.

Slope protection bricks 30 corresponding to the aerobic nitrification layer 3 are connected by small-aperture connecting plates 20.

The denitrification layer 4 comprises porcelain granules 39 with the diameter of 2-4cm, volcanic rocks 57 with the diameter of 1-3cm and iron-coated quartz sand 40 with the diameter of 1-2cm which are symmetrically arranged from outside to inside. The denitrification layer 4 has gradually smaller particle diameter from outside to inside and low oxygen content, which is beneficial to the proceeding of denitrification reaction. Meanwhile, the volcanic 57, the ceramsite 39 and the iron-coated quartz sand 40 have strong adsorption capacity on phosphorus, and a large number of denitrifying bacteria are attached to the surfaces of the volcanic 57, the ceramsite 39 and the iron-coated quartz sand 40, so that nitrate nitrogen is converted into nitrogen and discharged.

The denitrification layer 4 comprises a second multifunctional pipe 10, and the second multifunctional pipe 10 is arranged on one side far away from the river channel 6 along the vertical direction. One end of the second multifunctional tube 10 extends into the atmosphere, and the other end extends into the ceramsite 39, the volcanic rock 57 and the iron-coated quartz sand 40 which are symmetrically arranged from outside to inside. In specific implementation, the second multifunctional pipe 10 may be a PVC pipe with a diameter of 20cm and a thickness of 1cm, the second multifunctional pipe 10 is provided with a plurality of vent holes with a diameter of 0.5cm, and the upper portion of the second multifunctional pipe 10 is provided with a sealing cover 49. The sealing cover 49 is a circular cover made of silica gel having a diameter of 22cm and can be sealed on the second multifunctional tube 10 to prevent air from entering the denitrification layer 4. The second multifunctional tube 10 of the denitrification layer 4 has two main functions: firstly, dominant denitrifying bacteria can be put into the second multifunctional pipe 10, the multifunctional pipe is arranged in the upstream direction of water flow in the river bank percolation unit, and the denitrifying bacteria can be distributed on the whole denitrifying layer 4 along with the water flow, so that the denitrifying action of the denitrifying layer 4 is enhanced; second, the denitrification layer may be periodically back-flushed with a back-flush fluid.

The slope protection bricks 30 corresponding to the denitrification layer 4 are connected by solid connecting plates 21.

The organic pollutant high-efficiency removal layer 5 comprises 2-10cm of gravel 37 and 1-5cm of modified zeolite 38 which are mixed and paved, and the gravel 37 can play a good supporting role, so that the connectivity of the organic pollutant high-efficiency removal layer 5 is increased, and the oxygen content is increased; the modified zeolite 38 has large specific surface area and strong adsorption capacity to organic matters, thereby increasing the retention time of the organic matters in the organic pollutant high-efficiency removal layer 5. And a large amount of biological membranes are arranged on the surfaces of the gravels 37 and the zeolite layer 38, and a large amount of organic matter dominant degradation bacteria are attached to the biological membranes, so that the biological degradation can be carried out efficiently.

The high-efficient stratum of getting rid of organic pollutant 5 includes third multi-functional pipe 9, and third multi-functional pipe 9 sets up in the one side of keeping away from river course 6 along the vertical direction, and the one end of third multi-functional pipe 9 stretches into in the atmosphere, and the other end stretches into in the gravel and the modified zeolite that mix and lay. In specific implementation, the third multifunctional tube 9 may be a PVC tube with a diameter of 20cm and a thickness of 1cm, the third multifunctional tube 9 extends into the organic pollutant high-efficiency removal layer 5 and is provided with a plurality of vent holes with a diameter of 0.5cm, and the upper portion of the third multifunctional tube is provided with the grid cover 48. The grille cover 48 is a dense grid-shaped circular cover made of stainless steel with the diameter of 22cm, and can be buckled at the top of the third multifunctional pipe 9 to prevent sundries from falling into the third multifunctional pipe 9. The multifunctional tube of the organic pollutant high-efficiency removal layer 5 has three main functions: firstly, organic matter dominant degradation bacteria can be put into the third multifunctional pipe 9, the multifunctional pipe is arranged in the upstream direction of water flow in the river bank percolation unit, the organic matter dominant degradation bacteria can be distributed in the whole organic pollutant high-efficiency removal layer 5 along with the water flow, and the organic matter biodegradation effect of the organic pollutant high-efficiency removal layer 5 is enhanced; secondly, the aerobic nitrification layer 5 can be periodically back-flushed by a back-flushing liquid; third, the third multifunctional tube 9 is the same as the atmosphere, so that oxygen in the organic pollutant high-efficiency removal layer 5 can be increased, and the biodegradation efficiency of organic matters can be increased.

The slope protection bricks 30 corresponding to the organic pollutant high-efficiency removal layer 5 are connected by a porous connecting plate 50.

The slope protection bricks 30 are filled with soil bottom mud composite backfill layers 31, and aquatic plants 26 are planted on the soil bottom mud composite backfill layers 31.

The utility model discloses a regeneration water replenishing watercourse system based on bank infiltration that another embodiment provided includes regeneration water moisturizing unit, bank infiltration-biological treatment unit in, and at this moment, the influence of rainwater is not considered, consequently can not set up the rainwater and abandon a class collection unit, rainwater purification unit.

Referring to fig. 3 to 5, the slope protection brick 30 is made of bottom mud or cinder, and includes a main body, and an overflow chute 23, an outflow pipe 29 and a connecting plate groove 22 disposed on the main body. More specifically, the cross section of the body is square or rectangular; in this embodiment, the length and width of the body are both 50cm and 40 cm. The overflow groove 23 is disposed on the upper surface of the main body, and in this embodiment, there are two overflow grooves 23 respectively located on the edges of the two sides of the main body, that is, the edges of the first side and the third side that are parallel to each other. In this embodiment, the width of the overflow groove 23 is 5cm and the height thereof is 10 cm.

The top opening of the outflow pipe 29 is flush with the upper surface of the body and communicates with the overflow trough 23. The bottom of the outlet pipe 29 protrudes from the lower surface of the body by a length of 5-15cm, for example 10cm, so that the bottom of the semi-cylindrical outlet pipe 29 can be inserted into the filter material. The bottom of the outlet pipe 29 is provided with a bottom plate, and the bottom plate is provided with a plurality of through holes with the diameter smaller than that of the filter material, so that the filter material is prevented from being discharged from the outlet pipe 29; the through-hole may be a semicircular shape having a diameter of 0.5 cm.

In general, there may be 1 to 6 outlet pipes 29, and in this embodiment, there are 4 outlet pipes 29, and the overflow tank 23 on each side communicates with two outlet pipes 29. As shown in fig. 3, the outlet pipe 29 may have a semi-cylindrical shape in cross section. The outlet pipe 29 of the semi-cylinder is a hollow semi-cylinder with a diameter of 15cm and a height of 50 cm. In another embodiment of the present invention, the cross-section of the outlet pipe may be a quarter cylinder as shown in fig. 6, in which case the outlet pipe is adjacent to the second or fourth side of the body in addition to being in communication with the overflow groove 23.

The body is also provided with connecting plate grooves 23 which are arranged at the bottom of the overflow groove 23, the number of the connecting plate grooves 22 on one body can be 2 or 4, and the connecting plate grooves 22 are opposite to the outflow pipe 29. The width of the groove of the connecting plate is equal to the width of the overflow groove. In this embodiment, the connecting plate groove 22 has a length of 15cm, a width of 5cm, and a height of 5 cm. It should be noted that the side wall of the outflow pipe adjacent to the overflow groove and the connecting plate groove is provided with an opening, and the height of the opening is the sum of the overflow groove and the connecting plate groove, so that the bottom of the opening is flush with the bottom of the connecting plate groove. So, two adjacent or four connecting plate recesses of bank protection brick and the play flow tube that corresponds just constitute the connecting plate mounting groove. Referring to fig. 3 and 7, the upper and lower slope protection bricks in fig. 3 are installed together by the connection plate installed in the connection plate installation groove. When the outflow pipe is adjacent to the second edge or the fourth edge of the body, the side wall of the outflow pipe adjacent to the second edge or the fourth edge of the body is also provided with an opening except that the side wall of the outflow pipe adjacent to the overflow groove and the connecting plate groove is provided with an opening. So, the connecting plate mounting groove has just been constituteed to the connecting plate recess of four adjacent bank protection bricks and the play flow tube that corresponds. Referring to fig. 7, the 4 slope protection bricks in fig. 7 are also installed together by the connection plate installed in the connection plate installation groove.

The overflow grooves of adjacent slope protection bricks are butted to form an overflow channel. The connecting plate can be a solid connecting plate 21, a porous connecting plate 50 or a small-pore connecting plate 20, and the flow can be adjusted through connecting plates with different pore sizes.

Lay in the installation the utility model provides a during reclaimed water supply river course system based on bank infiltration, can adopt following step:

(1) selecting a reclaimed water supply river channel, excavating the river bank, compacting the side wall and the bottom, laying an impermeable layer, and determining the excavation depth and width according to the determined reclaimed water supply amount;

(2) the fixing pile is buried underground at the end of one side of the anti-seepage layer close to the river channel, the gravel and modified zeolite mixing layer is laid on the anti-seepage layer, one side of the anti-seepage layer is at a certain angle with the horizontal direction, the slope protection bricks are laid on one side of the anti-seepage layer, and the slope protection bricks are connected through the porous connecting plate. And gravel and a modified zeolite mixed layer are paved on the impervious layer, the total paving thickness is one third of the total excavation depth, and a multifunctional pipe is buried at one side far away from the river channel when the excavation depth is one sixth. And one side of the slope protection brick is at a certain angle with the horizontal direction, the slope protection brick is laid on one side of the slope protection brick, the slope protection bricks are connected through a porous connecting plate, a soil bottom mud backfill layer is filled on the slope protection brick, and aquatic plants are planted on the slope protection brick.

(3) And paving ceramsite, volcanic rock, iron-coated quartz sand, volcanic rock and ceramsite on the gravel and modified zeolite mixed layer from bottom to top in sequence, wherein the total paving depth is one third of the total excavation depth, and the thickness ratio of each layer is 1:1:2:1: 1. And burying the multifunctional pipe at one side far away from the river channel when the excavation depth is half. And (3) paving slope protection bricks like the step (2), connecting the slope protection bricks by using solid connecting plates, filling a soil bottom mud backfill layer on the slope protection bricks, and planting vegetation on the soil bottom mud backfill layer.

(4) And continuously paving the gravel and modified zeolite mixed layer on the ceramsite, wherein the total paving thickness is one third of the total excavation depth, and burying the multifunctional pipe at one side far away from the river channel when the excavation depth is five sixths. The regenerated water replenishing channel is arranged at the same depth. And (3) paving slope protection bricks as in the step (2), and connecting the slope protection bricks by using small-pore connecting plates. Soil bottom mud backfill layers are filled on the slope protection bricks, and shrub plants are planted on the slope protection bricks.

(5) And a rainwater discarding and collecting unit and a rainwater purification unit are arranged on one side of the river bank percolation-biological treatment unit, which is far away from the river channel, and the rainwater purification unit is connected with a reclaimed water replenishing channel.

(6) And putting the corresponding dominant flora of each layer into the three multifunctional pipes, and discharging a small amount of regenerated water into the regeneration water replenishing channel for 15-20 days to culture the microorganisms.

(7) And discharging the regenerated water to the regenerated water replenishing channel according to actual needs.

The embodiment of the utility model provides a reclaimed water supply river course method based on bank infiltration, include:

s11, enabling the regenerated water to enter an aerobic nitrification layer, adsorbing ammonia nitrogen in the regenerated water through the gravel and the modified zeolite in the aerobic nitrification layer, and converting the ammonia nitrogen into nitrate nitrogen by nitrifying bacteria on the gravel and the modified zeolite;

s12, enabling the reclaimed water to enter a denitrification layer, adsorbing phosphorus in the reclaimed water through ceramsite, volcanic rock and iron-coated quartz sand, and converting nitrate nitrogen into nitrogen gas by denitrifying bacteria on the ceramsite, volcanic rock and iron-coated quartz sand to be discharged;

and S13, enabling the regenerated water to enter an organic pollutant efficient removal layer, adsorbing the organic pollutants through the gravel and the modified zeolite, and degrading the organic pollutants by the dominant flora on the gravel and the modified zeolite.

The above-mentioned regenerated water replenishing method based on river bank percolation, i.e., steps S11 to S13, is suitable for non-rainfall conditions, i.e., steps S11 to S13 are working steps under non-rainfall conditions. At this time, the regenerated water is directly discharged from the regenerated water outlet pipe and enters the regenerated water replenishing channel, and in the specific implementation, before step S11, the method further includes: the biological biofilm culturing combined filler plate in the regeneration water replenishing channel and microorganisms on the biological biofilm culturing combined filler plate are adsorbed and biodegraded, and N, P and organic pollutants are primarily degraded.

After step S13, the porous connecting plate that the layer was got rid of to the high efficiency of organic pollutant is followed to the recycled water can flow out, gets into the river course, carries out further self-purification process in the river course, and then gets into groundwater, the underground aquifer of conservation through the riverbed.

When being in the rainfall condition, the embodiment of the utility model provides a reclaimed water supply river course method based on bank infiltration includes following work step:

s21, when the rainfall is 2mm less, the second electromagnetic valve is actuated, the rainfall enters the rainwater abandoning cavity through the rainwater collection pipe network and enters the urban sewage pipe network through the second electromagnetic valve for unified treatment.

And S22, when the rainfall is larger than 2mm, the second electromagnetic valve is closed, and the rainfall is filled in the rainwater discarding cavity and then enters the rainwater purification pool.

S23, after entering the rainwater purification tank, primarily precipitating through the prediction tank, and after precipitation, enabling the rainwater to enter the water collection tank and enter the reclaimed water replenishing channel through the filter screen.

And S24, when the rainfall intensity and the reclaimed water replenishing speed are less than the percolation speed of the percolation unit, repeating the working steps of the rainfall and reclaimed water mixed water body under the non-rainfall condition.

And S25, when the rainfall intensity and the reclaimed water supply speed are higher than the percolation speed of the percolation unit, part of the rainfall and reclaimed water mixed water body enters the overflow groove through the overflow port and enters the river channel, but the reclaimed water is diluted by the rainfall at the moment, and the part of the mixed water body enters the river channel, so that the river channel is not polluted. And the other part of the mixed water body enters a river bank percolation unit, and the working steps under the non-rainfall condition, namely the steps S11 to S13, are repeated.

In one embodiment of the present invention, a microbial community placement operation may be performed, including: reducing the supply amount of the regenerated water, putting the newly found microbial communities corresponding to each layer in each multifunctional tube, and continuously culturing for 15-20 days. After the culture is finished, the supply amount of the regenerated water of the river bank percolation unit is recovered.

At the time of delivery, at least one of:

In addition, can also carry out the back flush regeneration to the reclaimed water supply river course system based on bank infiltration, when concrete operation, include: put into the backwash liquid in to each multi-functional intraductal, open aerobic nitrification layer, denitrification layer, organic pollutant high efficiency respectively and get rid of the same small aperture connecting plate, the solid connecting plate, the porous connecting plate a plurality of arranging the overflow launder of indulging in the layer, collect the backwash liquid at this overflow launder, avoid causing secondary pollution to the river course. And after the backwashing is finished, putting back each connecting plate.

The utility model provides a reclaimed water supply river course system based on bank slope infiltration has following advantage:

1. the regenerated water is supplemented with water at the top of the river bank, nitrogen, phosphorus and pollutants in the regenerated water are effectively removed through the river bank percolation-biological treatment system, and the regenerated water is further deeply treated before entering the river channel, so that the phenomenon of eutrophication of the river channel supplemented by the regenerated water is prevented. The oxygen content of the water body in the river is further increased, so that the natural self-purification process in the river is facilitated, and the pollution risk of the groundwater supplemented by the reclaimed water is greatly reduced;

2. the early rainfall is discharged into an urban sewage pipe network through the waste flow, so that the non-point source pollution of the rainfall on the regenerated water supply river channel is avoided, and the ecological health of the river channel is facilitated;

3. clean rainfall which is abandoned by early rainfall is precipitated by a rainwater purification pool and enters a reclaimed water replenishing channel, one part of the clean rainfall directly enters a river channel, and the other part of the clean rainfall passes through a river bank percolation system-biological unit, so that backwashing regeneration is carried out on the river bank percolation system-biological unit to a certain extent. Rainwater enters the river channel to dilute the regenerated water, so that the self-cleaning capacity of the regenerated water for supplying the river channel is improved;

4. gravel and zeolite are laid on the aerobic nitrification layer and the organic pollutant efficient removal layer in a mixed mode, the gravel can play a good supporting role, and the connectivity of the aerobic nitrification layer and the organic pollutant efficient removal layer is increased, so that the oxygen content is increased; the modified zeolite has large specific surface area and strong ammonia nitrogen and organic matter adsorption capacity, thereby increasing the retention time of ammonia nitrogen and organic matter in an aerobic nitrification layer and an organic pollutant high-efficiency removal layer. And a large amount of biomembranes are arranged on the surfaces of the gravel and the zeolite layer, so that high-efficiency aerobic nitrification and organic matter biodegradation are carried out.

5. The denitrification layer is symmetrically provided with ceramsite with the diameter of 2-4cm, volcanic rock with the diameter of 1-3cm and iron-coated quartz sand with the diameter of 1-2cm from outside to inside. The filler diameter of the denitrification layer is gradually smaller from outside to inside, the oxygen content is low, and the denitrification reaction is facilitated. Meanwhile, the volcanic rock, the ceramsite and the iron-coated quartz sand have strong adsorption capacity on phosphorus, and a large number of denitrifying bacteria are attached to the surfaces of the volcanic rock, the ceramsite and the iron-coated quartz sand, so that nitrate nitrogen is converted into nitrogen and discharged.

6. The aerobic nitrification layer and the organic pollutant high-efficiency removal layer are provided with multifunctional pipes with grille covers, and the anti-nitrification layer is provided with multifunctional pipes with sealing covers. Firstly, microorganisms can be put into the multifunctional pipe, the multifunctional pipe is arranged in the upstream direction of water flow in the river bank percolation unit, the microorganisms can be distributed on all layers of the whole river bank percolation-biological treatment unit along with the water flow, the biodegradation effect is enhanced, and the microorganisms corresponding to different pollutants can be flexibly put in according to the related research progress; secondly, each layer of the river bank percolation-biological treatment unit can be periodically back-flushed by a back-flushing fluid; and thirdly, the multifunctional pipe with the grille cover is the same as the atmosphere, so that the oxygen of the organic pollutant high-efficiency removal layer and the aerobic nitrification layer can be increased, and the biodegradation efficiency of the organic matters is increased.

7. Under the operation state of the river bank percolation-biological treatment unit, a solid connecting cover is arranged between every two slope protection bricks to prevent water flow from overflowing. In the back washing process, the solid connecting cover can be opened, back washing liquid is put into the multifunctional pipe to form a complete back washing loop, each layer is back washed, the regenerated water of the unit is utilized, and the back washing liquid can be recovered from the overflow groove to prevent secondary pollution to the river.

8. Can flexibly deal with the potential environmental pollutant treatment problem in the future various reclaimed water supply processes. Firstly, the microbial structures of all layers can be flexibly adjusted, so that the problem of removing novel organic pollutants which gradually receives attention in recent years is solved. And secondly, the connecting plates of the slope protection bricks can be flexibly disassembled, so that the requirement on system filler backwashing regeneration can be met, and meanwhile, the number of the solid connecting plates can be flexibly adjusted according to the change of the supply amount of the reclaimed water, so that the reclaimed water flows out through the hollow semi-cylinders between every two slope protection bricks, and the permeability of a river bank percolation-biological treatment unit is increased.

The preferred embodiments of the present invention have been described with reference to the accompanying drawings, and those skilled in the art can implement the present invention in various modifications without departing from the scope and spirit of the present invention. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. The above description is only a preferred and practical embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the specification and the drawings of the present invention are included in the scope of the present invention.

Claims

1. A regenerated water replenishing riverway system based on riverway percolation is characterized by comprising a riverway percolation-biological treatment unit, wherein one side of the riverway percolation-biological treatment unit, which is far away from a riverway, is a vertical impermeable layer, one side of the riverway, which is close to the riverway, is paved with slope protection bricks, and an organic pollutant high-efficiency removal layer, a denitrification layer and an aerobic nitrification layer are sequentially arranged between the slope protection bricks and the vertical impermeable layer from bottom to top; wherein:

2. The riparian filtration-based reclaimed water replenishing riverway system according to claim 1, wherein the riparian filtration-based reclaimed water replenishing riverway system comprises a reclaimed water replenishing unit, the reclaimed water replenishing unit comprises a reclaimed water replenishing channel arranged above the aerobic nitrification layer and a biofilm formation combined filler plate arranged in the reclaimed water replenishing channel, and the reclaimed water replenishing channel is made of a permeable wall and is provided with an overflow port.

3. The reclaimed water replenishing riverway system based on riverbank percolation as claimed in claim 2, wherein a plurality of fixing rods are buried at the bottom of the reclaimed water replenishing canal, and the biofilm culturing composite packing plates are fixed among the fixing rods through elastic ropes.

4. The riparian filtration-based reclaimed water replenishing waterway system according to claim 2, wherein the riparian filtration-based reclaimed water replenishing waterway system comprises a rainwater purification unit including a rainwater purification tank and a partition plate provided in the rainwater purification tank, and the rainwater purification tank is connected to the reclaimed water replenishing channel by a communication pipe.

5. The reclaimed water replenishing riverway system according to claim 4, wherein a second solenoid valve is provided on the communicating pipe.

6. The riparian filtration-based reclaimed water replenishing riverway system according to claim 1, wherein the riparian filtration-based reclaimed water replenishing riverway system comprises a rainwater discarding collection unit, the rainwater discarding collection unit comprises a rainwater collection greenbelt and a rainwater discarding chamber, the rainwater collection greenbelt comprises a soil layer, a river sand layer and an impermeable layer from top to bottom, a rainwater collection pipe network is arranged in the river sand layer, the rainwater collection pipe network is connected with the rainwater discarding chamber, and the bottom of the rainwater discarding chamber is connected with a municipal sewage pipe network.

7. The riparian-based reclaimed water replenishing riverway system according to claim 6, wherein a first solenoid valve is arranged between the rainwater collection pipe network and the rainwater discarding chamber, the first solenoid valve is connected with a rainwater discarding device through a wire, and the rainwater discarding device is arranged on the rainwater collection greenbelt and is used for opening the first solenoid valve when the rainfall is less than a preset value.

8. The riparian filtration-based reclaimed water replenishing waterway system according to claim 1, wherein an overflow path is formed between adjacent two of the slope protection bricks.