A multi-filter layer self-cleaning terminal water seepage reactor and method

Abstract

The present invention provides a multi-filter layer self-cleaning terminal seepage reactor and method, belonging to the field of artificial fast seepage technology for sewage treatment. The water inlet is arranged at the bottom of the reaction cylinder, the water outlet is arranged at the top of the reaction cylinder, and the reflux pipe connects the water inlet and the water outlet, which solves the problem in the prior art that water that is still not up to standard after being filtered by the seepage reactor cannot automatically flow back to the first layer of filter filler. The reactor includes a reaction cylinder, a water inlet, a water outlet and a reflux pipe, the water inlet is arranged at the bottom of the reaction cylinder, an inlet valve is arranged on the water inlet, the water outlet is arranged at the top of the reaction cylinder, an outlet valve is arranged on the water outlet, and a supporting layer, a percolation layer, a gravel layer, a mixed layer and a protective layer are arranged in sequence from bottom to top in the reaction cylinder, and sewage flows through different layers from bottom to top in sequence; the reflux pipe connects the water inlet and the water outlet, and a reflux valve is arranged on the reflux pipe.

Description

Technical Field

[0001] The invention belongs to the technical field of artificial rapid infiltration for sewage treatment, and in particular relates to a multi-filter layer self-cleaning terminal water infiltration reactor and a method thereof. Background Art

[0002] The operation mode of the existing multi-filter layer self-cleaning terminal seepage reactor is that sewage flows from top to bottom through multiple layers of fillers, and suspended particles of different particle sizes in the sewage are filtered out when flowing through different layers of fillers. Other dissolved pollutants in the sewage (COD, ammonia nitrogen and total phosphorus, etc.) will also be further removed by the fillers in each filler layer, the microorganisms attached and grown on its surface, and the roots of the top plants. The treated water flowing out from the last layer is tested. If it meets the standard, it is discharged into the natural water body. If it does not meet the standard, the water is pumped to the top layer, that is, the first layer of fillers, and the sewage is filtered again. In order to simplify this process flow, it is necessary to improve the existing seepage reactor so that when the water flowing out after being treated by the improved seepage reactor is not up to standard, the water flowing out can automatically flow back to the first layer of filter fillers without using a water pump to pump it to the first layer of filter fillers. At the same time, in order to enhance the decontamination effect of the improved reactor, it is also necessary to seek the synergistic effect of multi-directional decontamination methods. Summary of the invention

[0003] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a multi-filter layer self-cleaning terminal water seepage reactor and method, which is used to solve the problem in the prior art that water that is still detected to be substandard after filtration in the water seepage reactor cannot automatically flow back to the first layer of filter filler for further filtration.

[0004] To achieve the above-mentioned purpose and other related purposes, the present invention provides a multi-filter layer self-cleaning terminal seepage reactor, comprising: a reaction cylinder, a water inlet end, a water outlet end and a reflux pipe, wherein the water inlet end is arranged at the bottom of the reaction cylinder, a water inlet valve is arranged on the water inlet end, the water outlet end is arranged at the top of the reaction cylinder, a water outlet valve is arranged on the water outlet end, a supporting layer, a percolation layer, a crushed stone layer, a mixing layer and a protective layer are arranged in sequence from the bottom to the top of the reaction cylinder, and sewage flows through different layers in sequence from bottom to top;

[0005] The reflux pipe is connected with the water inlet and the water outlet, and a reflux valve is arranged on the reflux pipe.

[0006] Optionally, the height ratio of the supporting layer, the infiltration layer, the gravel layer, the mixed layer and the protective layer is 5:20:1:12:8.

[0007] Optionally, the filler of the supporting layer is gravel with a particle size between 4 mm and 40 mm;

[0008] The filler of the infiltration layer is natural river sand with a particle size between 0.5 mm and 2 mm;

[0009] The particle size of the filler particles in the crushed stone layer is between 4 mm and 30 mm;

[0010] The filler of the mixed layer is natural river sand, zeolite sand and steel slag mixed together with a particle size between 0.5 mm and 2 mm.

[0011] Optionally, the volume ratio of natural river sand, zeolite sand and steel slag in the mixed layer is 3:2:1.

[0012] Optionally, the reaction cylinder comprises a backwashing device, and the backwashing device is installed between the supporting layer and the percolation layer;

[0013] The backwashing device comprises a gravel baffle, a water injection ring and a river sand baffle, wherein the gravel baffle is installed on the top of the supporting layer, the river sand baffle is installed on the bottom of the percolation layer, and the water injection ring is installed between the gravel baffle and the river sand baffle;

[0014] The gravel retaining plate is provided with a plurality of gravel retaining holes, and the diameter of the gravel retaining holes is less than 4 mm;

[0015] The river sand retaining plate is provided with a plurality of river sand retaining holes, and the diameter of the river sand retaining holes is less than 0.5 mm;

[0016] Backwash water is injected into the water injection ring from the outside of the reaction cylinder, and then flows through the gravel baffle and flushes into the supporting layer. A backwash drain pipe is arranged at the bottom of the supporting layer, and a drain valve is arranged on the backwash drain pipe.

[0017] Optionally, the backwash drain pipe is divided into multiple sections along the axial direction, and the diameters of the backwash drain pipes of two adjacent sections are different.

[0018] Optionally, the reaction cylinder is installed underground or above the ground, at least one water injection groove is arranged in the water injection ring, a water injection pipe is arranged on the outer wall of the water injection ring, a water injection valve is arranged on the water injection pipe, backwash water is injected into the water injection groove from the water injection pipe, a plurality of flushing pipes are arranged on the inner wall of the water injection ring, the inclination angles between the flushing pipes and the inner wall of the water injection ring are different, the backwash water in the water injection groove flows out from different flushing pipes and flushes to different positions of the gravel baffle, and finally flushes into the supporting layer.

[0019] Optionally, the reaction cylinder is installed above the ground, the water injection ring includes a first arc ring and a second arc ring, the first arc ring and the second arc ring are spliced ​​into a complete water injection ring, and two ends of the second arc ring and two ends of the first arc ring are detachably connected together;

[0020] Alternatively, the water injection ring includes a third arc ring, a fourth arc ring and a fifth arc ring, and the third arc ring, the fourth arc ring and the fifth arc ring are spliced ​​into the complete water injection ring, one end of the fourth arc ring is rotatably connected to one end of the third arc ring, one end of the fifth arc ring is rotatably connected to the other end of the third arc ring, and the other end of the fourth arc ring is sealed and fitted to the other end of the fifth arc ring.

[0021] Optionally, pollution-tolerant plants are planted in the reaction cylinder, the roots of the pollution-tolerant plants grow below the upper surface of the mixed layer, and the stems and leaves of the pollution-tolerant plants grow above the upper surface of the mixed layer.

[0022] A method for using a multi-filter layer self-cleaning terminal water seepage reactor as described above includes the following steps:

[0023] Injecting sewage: sewage enters the reactor through the water inlet, and flows through the supporting layer, the percolation layer, the gravel layer and the mixed layer from bottom to top, and finally reaches the protective layer;

[0024] Adding additives: Add Fe 2+ and additives of microbial strains;

[0025] Detecting the filtered water: detecting whether the filtered water in the protective layer meets the standard. If it meets the standard, the filtered water flows out through the water outlet, otherwise it flows back to the water inlet through the return pipe and is filtered again from bottom to top;

[0026] Backwashing the supporting layer: injecting backwashing water from the water injection pipe into the water injection ring, and the backwashing water flows out from the ports of the plurality of water flushing pipes to different positions of the gravel baffle, flushes into the supporting layer, and flushes away the large particle impurities filtered by the supporting layer;

[0027] The water pressure of the backwash water flowing out of the port of the flushing pipe is changed by adjusting the water pressure in the water injection pipe, and the backwash water is adjusted to flush different positions of the gravel baffle by using the flushing pipes with different inclination angles.

[0028] As described above, the multi-filter layer self-cleaning terminal water seepage reactor and method of the present invention have at least the following beneficial effects:

[0029] 1. In the present application, the water inlet is arranged at the bottom of the reaction cylinder, the water outlet is arranged at the top of the reaction cylinder, and the sewage flows from bottom to top. The reflux pipe is connected to the water inlet and the water outlet, so that the water that is still not up to standard after infiltration can automatically flow back to the water inlet under the action of its own gravity, thereby solving the problem in the prior art that the water that is still not up to standard after being filtered through the infiltration reactor cannot automatically flow back to the first layer of filter filler for further infiltration.

[0030] 2. The present application not only performs preliminary filtration of sewage through the design of the supporting layer, but also supports other filter layers in the entire reaction tube; through the design of the percolation layer, pollutants such as COD, NH3-N and TP in sewage can be removed; through the design of the gravel layer, a large porosity in the reaction tube is ensured, and the filter layer above it is also supported; through the design of the mixing layer, under the premise of ensuring that the roots of the pollution-tolerant plants can stretch freely, Fe is supplemented by adding steel slag 2+ , increasing the treatment efficiency and the sewage treatment effect of the filter layer; through the design of the protective layer, the pollution-resistant plants can be protected from being blown off by strong winds and the surface soil and gravel can be protected from being blown away. At the same time, the protective layer also has an "anti-overflow" function, that is, preventing accidents from causing the water level to rise and water to overflow from all sides.

[0031] 3. Through the design of the backwashing device, the present application backwashes the first filter layer, i.e., the supporting layer, after the reaction cylinder has been used for a period of time, to prevent the supporting layer from being blocked and ensure the normal use of the reaction cylinder.

[0032] 4. The present application designs different inclination angles between the flushing pipe and the inner wall of the water injection ring, and adjusts the water pressure of the water injection pipe, so that the backwashing water can be flushed to different positions of the gravel baffle, thereby ensuring the backwashing effect on the supporting layer.

[0033] 5. The present application adds Fe to the reactor 2+ and microbial strains, further improving the decontamination effect of the reactor; BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Shown is a schematic diagram of a multi-filter layer self-cleaning terminal water seepage reactor of the present invention.

[0035] Figure 2 Shown is a schematic diagram of each filter layer in the reaction tube of the present invention.

[0036] Figure 3 Shown is a schematic diagram of the backwashing device of the present invention.

[0037] Figure 4 Display as Figure 3 Internal schematic diagram.

[0038] Figure 5 Shown are schematic diagrams of two backwashing devices when the present invention is installed on the ground.

[0039] Component number description

[0040] Reaction cylinder 1, supporting layer 11, percolation layer 12, gravel layer 13, mixing layer 14, protective layer 15; water inlet end 2, water outlet end 3, reflux pipe 4; backwashing device 5, gravel baffle 51, gravel baffle hole 511, water injection ring 52, water injection trough 521, water injection pipe 522, water injection valve 523, flushing pipe 524; first arc ring 525, second arc ring 526, third arc ring 527, fourth arc ring 528, fifth arc ring 529; river sand baffle 53, river sand baffle hole 531, backwashing drainage pipe 54; pollution-resistant plants 6. DETAILED DESCRIPTION

[0041] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0042] See also Figures 1 to 5 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0043] The following embodiments are only for illustration purposes and can be combined with each other, and are not limited to the contents presented in the following single embodiments.

[0044] See also Figure 1 and Figure 2The present invention provides a multi-filter layer self-cleaning terminal seepage reactor, comprising: a reaction cylinder 1, a water inlet end 2, a water outlet end 3 and a reflux pipe 4, wherein the water inlet end 2 is arranged at the bottom of the reaction cylinder 1, and a water inlet valve is arranged on the water inlet end 2, and the water outlet end 3 is arranged at the top of the reaction cylinder 1, and a water outlet valve is arranged on the water outlet end 3. A supporting layer 11, a percolation layer 12, a crushed stone layer 13, a mixing layer 14 and a protective layer 15 are arranged in sequence from the bottom to the top in the reaction cylinder 1, and sewage flows through different layers in sequence from bottom to top;

[0045] The reflux pipe 4 is connected with the water inlet end 2 and the water outlet end 3. A reflux valve is arranged on the reflux pipe 4. When the water inlet valve is opened, sewage flows from the water inlet end 2 into the bottom of the reaction cylinder 1. With the inflow of sewage, the sewage in the reaction cylinder 1 gradually rises and flows through different filter layers in turn. After multiple filtrations, the sewage reaches the protective layer 15. The inspection personnel inspect the sewage in the protective layer 15. If the inspection result meets the standard, the water outlet valve is opened and the sewage flows out from the water outlet end 3. Otherwise, the reflux valve is opened and the sewage in the protective layer 15 flows out of the protective layer 15. Under the action of gravity, it flows to the water inlet end 2 through the reflux pipe 4 and is filtered again. In the present invention, the water inlet end 2 is arranged at the bottom of the reaction cylinder 1, and the water outlet end 3 is arranged at the top of the reaction cylinder 1. The sewage flows from bottom to top. The reflux pipe 4 is designed to connect the water inlet end 2 and the water outlet end 3, so that the water that is still detected as not meeting the standards after infiltration can automatically flow back to the water inlet end 2 under the action of its own gravity, thereby solving the problem in the prior art that the water that is still detected as not meeting the standards after filtration in the infiltration reactor cannot automatically flow back to the first layer of filter filler.

[0046] For this example, please refer to Figure 2 The height ratio of the supporting layer 11, the percolation layer 12, the gravel layer 13, the mixed layer 14 and the protective layer 15 is 5:20:1:12:8. The height ratio of different filter layers can be changed according to the actual situation of the sewage to be treated. The functions of each filter layer are:

[0047] The supporting layer 11 performs preliminary filtration on the sewage and also supports other filter layers in the entire reaction cylinder 1;

[0048] The infiltration layer 12 can remove pollutants such as COD, NH3-N and TP in the sewage. Microbial strains can be added to the infiltration layer 12 to increase the decontamination effect of the filter layer.

[0049] The crushed stone layer 13 ensures a large porosity in the reaction tube 1 and also supports the filter layer above it;

[0050] The mixed layer 14 ensures that the roots of the pollution-tolerant plants can stretch freely, and the Fe 2+ , increasing the treatment efficiency of the filter layer's sewage treatment effect, Fe 2+ It has the characteristics of coagulation and phosphorus removal, and some Fe 2+ Oxidized to positively charged Fe in the aerobic zone 3+ , and then react with the negatively charged PO4 in the sewage 3- The reaction generates insoluble FePO4, which is beneficial to the removal of phosphorus. At the same time, Fe 2+ The effect of microbial strains in removing pollutants can be enhanced, so that the reactor can still maintain a good decontamination effect on elements such as nitrogen and phosphorus in winter;

[0051] The protective layer 15 can protect the pollution-resistant plants from being broken by strong winds and protect the surface soil and gravel from being blown away. It also has an "anti-overflow" function, that is, preventing accidents from causing the water level to rise and water to overflow from all sides.

[0052] For this example, please refer to Figure 2 The filler of the supporting layer 11 is gravel with a particle size between 4 mm and 40 mm. The present invention selects gravel with a particle size of 4 mm, gravel with a particle size of 22 mm, and gravel with a particle size of 40 mm as the filler of the supporting layer 11;

[0053] The filler of the filtration layer 12 is natural river sand with a particle size between 0.5 mm and 2 mm. The present invention selects natural river sand with a particle size of 0.5 mm, natural river sand with a particle size of 1.2 mm, and natural river sand with a particle size of 2 mm as the filler of the filtration layer 12;

[0054] The filler particles of the crushed stone layer 13 have a particle size of 4 mm to 30 mm. The present invention selects crushed stones with a particle size of 5 mm, crushed stones with a particle size of 6.5 mm, and crushed stones with a particle size of 8 mm as the filler of the crushed stone layer 13;

[0055] The filler of the mixed layer 14 is a mixture of natural river sand, zeolite sand and steel slag with a particle size between 0.5 mm and 2 mm. The present invention selects a mixture of natural river sand, zeolite sand and steel slag with a particle size of 0.5 mm, a mixture of natural river sand, zeolite sand and steel slag with a particle size of 1.2 mm, and a mixture of natural river sand, zeolite sand and steel slag with a particle size of 2 mm as the filler of the mixed layer 14;

[0056] The selection of the filler in the reactor and the selection of its size and ratio can be adjusted according to different needs. The filler weight, size and ratio selected in this embodiment are not the only ones.

[0057] For this example, please refer to Figure 2The volume ratio of natural river sand, zeolite sand and steel slag in the mixed layer 14 is 3:2:1, and the volume ratio can be adjusted according to the specific conditions of the sewage to be treated. Zeolite sand has a catalytic effect and can promote the activity of the specific bacteria added in the reaction tube 1. The addition of steel slag increases the Fe 2+ The content can enhance the decontamination effect of the filter layer.

[0058] For this example, please refer to Figures 3 to 5 The reaction cylinder 1 includes a backwashing device 5, which is installed between the supporting layer 11 and the percolation layer 12, and is used to backwash away the blockage in the supporting layer 11;

[0059] The backwashing device 5 comprises a gravel baffle 51, a water injection ring 52 and a river sand baffle 53. The gravel baffle 51 is installed on the top of the supporting layer 11, the river sand baffle 53 is installed on the bottom of the percolation layer 12, the water injection ring 52 is installed between the gravel baffle 51 and the river sand baffle 53, and the connection parts between the water injection ring 52 and the gravel baffle 51 and the river sand baffle 53 are all sealed;

[0060] The gravel retaining plate 51 is provided with a plurality of gravel retaining holes 511, the diameter of the gravel retaining holes 511 being less than 4 mm, and the purpose of such design is to prevent the gravel filler in the supporting layer 11 from being washed into the water injection ring 52 by sewage;

[0061] The river sand retaining plate 53 is provided with a plurality of river sand retaining holes 531, the diameter of the river sand retaining holes 531 being less than 0.5 mm, and the purpose of such design is to prevent the river sand in the percolation layer 12 from falling into the water injection ring 52;

[0062] Backwash water is injected into the water injection ring 52 from the outside of the reaction cylinder 1, and then flows through the gravel baffle 51 and flushes into the support layer 11. A backwash drain pipe 54 is provided at the bottom of the support layer 11, and a drain valve is provided on the backwash drain pipe 54;

[0063] After the reaction cylinder 1 is used for a period of time, the first filter layer, namely the supporting layer 11 , is backwashed to prevent the supporting layer 11 from being blocked and ensure the normal use of the reaction cylinder 1 .

[0064] For this example, please refer to Figure 3The backwash drain pipe 54 is divided into multiple sections along the axial direction. The diameters of the backwash drain pipe 54 in two adjacent sections are not equal. The continuous change of the inner diameter of the backwash drain pipe 54 can change the flow rate of the water in the pipe. When water flows from the area with a large diameter to the area with a small diameter, the flow rate of the water becomes faster, thereby carrying away the sediment in the backwash drain pipe 54. This design utilizes the principle of water binding and sand attack.

[0065] For this example, please refer to Figure 3 and Figure 4 The reaction cylinder 1 is installed underground or above the ground, a water injection groove 521 is arranged in the water injection ring 52, a water injection pipe 522 is arranged on the outer wall of the water injection ring 52, and a water injection valve 523 is arranged on the water injection pipe 522. Backwash water is injected into the water injection groove 521 from the water injection pipe 522. A plurality of flushing pipes 524 are arranged on the inner wall of the water injection ring 52. The inclination angles between the flushing pipes 524 and the inner wall of the water injection ring 52 are different, and the lengths of the flushing pipes 524 can be different. The backwash water in the water injection groove 521 flows out from different flushing pipes 524 and rushes to different positions of the gravel baffle 51, and finally rushes into the supporting layer 11.

[0066] For this example, please refer to Figure 3 and Figure 4 The reaction cylinder 1 is installed underground or above the ground. Three water injection grooves 521 are arranged in the water injection ring 52. The three water injection grooves 521 are not connected to each other. Three water injection pipes 522 are arranged on the outer wall of the water injection ring 52. Each of the water injection pipes 522 is provided with a water injection valve 523. Each of the water injection pipes 522 is connected to one of the water injection grooves 521. Backwashing water is injected into the water injection grooves 521 from the water injection pipes 522. The inner wall of the water injection ring 52 is provided with a valve 523 along its axial direction. Three rows of flushing pipes 524 are arranged, and the inclination angles between the flushing pipes 524 in each row and the inner wall of the water injection ring 52 are different. The backwash water in each water injection tank 521 flows out from the flushing pipe 524 connected thereto and rushes to different positions of the gravel baffle 51, and finally rushes into the supporting layer 11. When the flushing pipes 524 in different rows discharge water at the same time, the water flows will interfere. In actual use, the water injection valves 523 on the three water injection pipes 522 can be opened one by one.

[0067] The water injection valve 523 is a solenoid valve, which is used to adjust the amount of backwash water in the water injection tank 521, and then adjust the water pressure of the backwash water discharged from the flushing pipe 524.

[0068] For this example, please refer to Figure 5, the reaction tube 1 is installed above the ground, the water injection ring 52 includes a first arc ring 525 and a second arc ring 526, the first arc ring 525 and the second arc ring 526 are spliced ​​into the complete water injection ring 52, and the two ends of the second arc ring 526 and the two ends of the first arc ring 525 are detachably connected together. Because the reaction tube 1 is installed above the ground, the second arc ring 526 can be directly removed, and backwashing water can be directly injected into the water injection ring 52 to backwash the supporting layer 11;

[0069] Alternatively, the water injection ring 52 includes a third arc ring 527, a fourth arc ring 528 and a fifth arc ring 529, and the third arc ring 527, the fourth arc ring 528 and the fifth arc ring 529 are spliced ​​into the complete water injection ring 52, one end of the fourth arc ring 528 is rotatably connected to one end of the third arc ring 527, one end of the fifth arc ring 529 is rotatably connected to the other end of the third arc ring 527, the other end of the fourth arc ring 528 is sealed with the other end of the fifth arc ring 529, the fourth arc ring 528 and the fifth arc ring 529 are rotated outward, and backwashing water is directly injected into the water injection ring 52 to backwash the supporting layer 11.

[0070] For this example, please refer to Figure 1 and Figure 2 A pollution-tolerant plant 6 is planted in the reaction tube 1, and the roots of the pollution-tolerant plant 6 grow below the upper surface of the mixed layer 14, and the stems and leaves of the pollution-tolerant plant 6 grow above the upper surface of the mixed layer 14. The main functions of the pollution-tolerant plant 6 are: ① utilizing the plant root system to absorb nutrient-rich substances such as N and P elements in the sewage, thereby strengthening the "pollution reduction" function and further improving the sewage treatment effect of the reactor; ② playing an aesthetic function; ③ additional functions of green products.

[0071] The pollution-resistant plant 6 selected by the present invention is purple-backed amaranth, which has the advantages of liking a humid environment, fast production, strong stress resistance, relatively developed root system and easy planting. Other indigenous ornamental varieties suitable for growing in the local environment, such as calla lily, red bamboo, camellia, golden-edged boxwood, and red-flowered loblolly, can also be selected, or plants such as water spinach and sweet potato leaves can also be planted to make these plants "green ecological vegetables". The selection of specific plants can be adjusted and replaced according to the geographical climate, environment, season, etc. of the site. When replacing the plants in the reactor, it is only necessary to use a flower shovel to remove the planted plants and then plant the newly selected plants. Because the sewage treated by the present invention is domestic wastewater from highway service areas and rural decentralized sites, it is similar to the traditional "rural organic fertilizer". It does not contain toxic and harmful substances such as heavy metals and antibiotics. Therefore, the vegetables grown with it belong to the category of ecological products.

[0072] For this example, please refer to Figure 1 The depth of the reaction cylinder 1 selected in the present invention is greater than 2.3m, the diameter is 0.7m, the height of the supporting layer 11 is 0.25m, the height of the infiltration layer 12 is 0.1m, the height of the gravel layer 13 is 0.05m, the height of the mixed layer 14 is 0.6m, the height of the protective layer 15 is 0.4m, and the depth of the reaction cylinder 1 is equal to 2.3m plus the thickness of the backwashing device 5.

[0073] See also Figures 1 to 5 The present invention provides a method for using a multi-filter layer self-cleaning terminal water seepage reactor, comprising the following steps:

[0074] Installing the reactor: installing a certain number of the reactors at the sewage treatment site according to the different amounts of sewage to be treated at different sites;

[0075] Injecting sewage: sewage enters the reactor through the water inlet 2, and flows through the supporting layer 11, the percolation layer 12, the gravel layer 13 and the mixed layer 14 from bottom to top, and finally reaches the protective layer 15;

[0076] Adding additives: Add ferrous sulfate and microbial strains to the reactor. 2+ After replenishment, the renewal and metabolism of microbial strains are promoted, the amount of residual pollutants attached to the biofilm of the filter layer is reduced, and the surface of the filler particles has more adsorption sites, thereby improving the filler's adsorption performance for phosphorus pollutants. Ferrous ions themselves have the characteristics of coagulation and phosphorus removal, and some Fe 2+ Oxidized to Fe 3+ , and then react with the negatively charged PO4 in the sewage 3-The reaction generates insoluble FePO4, which is beneficial to the removal of phosphorus. At the same time, in the season with lower temperature, ferrous sulfate is added to reduce the Fe content in the wastewater of the main reactor. 2+ At 10-12 mg / L;

[0077] Detecting the filtered water: Detecting whether the filtered water in the protective layer 15 meets the standard. If it meets the standard, the filtered water flows out through the water outlet 3. Otherwise, it flows back to the water inlet 2 through the return pipe 4 and is filtered again from bottom to top.

[0078] Backwashing the supporting layer 11: injecting backwashing water from the water injection pipe 522 into the water injection ring 52, and the backwashing water flows out from the ports of the plurality of water flushing pipes 524 to different positions of the gravel baffle 51, flushes into the supporting layer 11, and flushes away the large particles of impurities filtered by the supporting layer 11;

[0079] The water pressure of the backwash water flowing out of the port of the flushing pipe 524 is changed by adjusting the water pressure in the water injection pipe 522, and the backwash water is adjusted to be flushed to different positions of the gravel baffle 51 in combination with the flushing pipes 524 at different inclination angles. For the design with multiple rows of flushing pipes 524, the water injection valves 523 on the multiple water injection pipes 522 are opened one by one, and the flushing pipes 524 are used to flush water to the gravel baffle 51 row by row.

[0080] In summary, the multi-filter layer self-cleaning terminal water seepage reactor and method of the present invention is that the water inlet end 2 is arranged at the bottom of the reaction cylinder 1, the water outlet end 3 is arranged at the top of the reaction cylinder 1, and the sewage flows from bottom to top. The design of the reflux pipe 4 connecting the water inlet end 2 and the water outlet end 3 makes it possible for the water that still fails to meet the standard after infiltration to automatically flow back to the water inlet end 2 under the action of its own gravity, thereby solving the problem in the prior art that the water that still fails to meet the standard after filtration in the water seepage reactor cannot automatically flow back to the first layer of filter filler. At the same time, through the design of the backwashing device 5, after the reaction cylinder 1 has been used for a period of time, the first filter layer, i.e., the supporting layer 11, is backwashed to prevent the supporting layer 11 from being blocked, thereby ensuring the normal use of the reaction cylinder 1; and through the design of different inclination angles between the flushing pipe 524 and the inner wall of the water injection ring 52, and the use of adjusting the water pressure of the water injection pipe 522, the backwashing water can be flushed to different positions of the gravel baffle 51, thereby ensuring the backwashing effect on the supporting layer 11. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has a high industrial utilization value.

[0081] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A multi-filter layer self-cleaning terminal water seepage reactor, characterized in that: It comprises a reaction cylinder, a water inlet, a water outlet and a reflux pipe, wherein the water inlet is arranged at the bottom of the reaction cylinder, a water inlet valve is arranged on the water inlet, the water outlet is arranged at the top of the reaction cylinder, a water outlet valve is arranged on the water outlet, a supporting layer, a percolation layer, a gravel layer, a mixed layer and a protective layer are arranged in sequence from the bottom to the top in the reaction cylinder, and sewage flows through different layers in sequence from bottom to top; the height ratio of the supporting layer, the percolation layer, the gravel layer, the mixed layer and the protective layer is 5:20:1:12:8; The reflux pipe is connected with the water inlet and the water outlet, and a reflux valve is provided on the reflux pipe; The reaction cylinder comprises a backwashing device, and the backwashing device is installed between the supporting layer and the percolation layer; The backwashing device comprises a gravel baffle, a water injection ring and a river sand baffle, wherein the gravel baffle is installed on the top of the supporting layer, the river sand baffle is installed on the bottom of the percolation layer, and the water injection ring is installed between the gravel baffle and the river sand baffle; The gravel retaining plate is provided with a plurality of gravel retaining holes, and the diameter of the gravel retaining holes is less than 4 mm; The river sand retaining plate is provided with a plurality of river sand retaining holes, and the diameter of the river sand retaining holes is less than 0.5 mm; Backwash water is injected into the water injection ring from the outside of the reaction cylinder, and then flows through the gravel baffle and flushes into the supporting layer. A backwash drain pipe is provided at the bottom of the supporting layer, and a drain valve is provided on the backwash drain pipe; The backwash drainage pipe is divided into multiple sections along the axial direction, and the diameters of the backwash drainage pipes of two adjacent sections are different; The reaction cylinder is installed underground or above the ground, at least one water injection groove is arranged in the water injection ring, a water injection pipe is arranged on the outer wall of the water injection ring, a water injection valve is arranged on the water injection pipe, backwash water is injected into the water injection groove from the water injection pipe, a plurality of flushing pipes are arranged on the inner wall of the water injection ring, the inclination angles between the flushing pipes and the inner wall of the water injection ring are different, the backwash water in the water injection groove flows out from different flushing pipes and rushes to different positions of the gravel baffle, and finally rushes into the supporting layer.

2. A multi-filter layer self-cleaning terminal water seepage reactor according to claim 1, characterized in that: The filler of the supporting layer is gravel with a particle size between 4 mm and 40 mm; The filler of the infiltration layer is natural river sand with a particle size between 0.5 mm and 2 mm; The particle size of the filler particles in the crushed stone layer is between 4 mm and 30 mm; The filler of the mixed layer is natural river sand, zeolite sand and steel slag mixed together with a particle size between 0.5 mm and 2 mm.

3. A multi-filter layer self-cleaning terminal water seepage reactor according to claim 2, characterized in that: The volume ratio of natural river sand, zeolite sand and steel slag in the mixed layer is 3:2:

1.

4. The multi-filter layer self-cleaning terminal water seepage reactor according to claim 1, characterized in that: The reaction cylinder is installed above the ground, and the water injection ring includes a first arc ring and a second arc ring, the first arc ring and the second arc ring are spliced ​​into a complete water injection ring, and two ends of the second arc ring and two ends of the first arc ring are detachably connected together; Alternatively, the water injection ring includes a third arc ring, a fourth arc ring and a fifth arc ring, and the third arc ring, the fourth arc ring and the fifth arc ring are spliced ​​into the complete water injection ring, one end of the fourth arc ring is rotatably connected to one end of the third arc ring, one end of the fifth arc ring is rotatably connected to the other end of the third arc ring, and the other end of the fourth arc ring is sealed and fitted to the other end of the fifth arc ring.

5. The multi-filter layer self-cleaning terminal water seepage reactor according to claim 1, characterized in that: Pollution-tolerant plants are planted in the reaction cylinder, the roots of the pollution-tolerant plants grow below the upper surface of the mixed layer, and the stems and leaves of the pollution-tolerant plants grow above the upper surface of the mixed layer.

6. A method for using the multi-filter layer self-cleaning terminal water seepage reactor according to claim 4, characterized in that: The steps include: Injecting sewage: sewage enters the reactor through the water inlet, and flows through the supporting layer, the percolation layer, the gravel layer and the mixed layer from bottom to top, and finally reaches the protective layer; Adding additives: Add Fe 2+ and additives of microbial strains; Detecting the filtered water: detecting whether the filtered water in the protective layer meets the standard. If it meets the standard, the filtered water flows out through the water outlet, otherwise it flows back to the water inlet through the return pipe and is filtered again from bottom to top; Backwashing the supporting layer: injecting backwashing water from the water injection pipe into the water injection ring, and the backwashing water flows out from the ports of the plurality of water flushing pipes to different positions of the gravel baffle, flushes into the supporting layer, and flushes away the large particle impurities filtered by the supporting layer; The water pressure of the backwash water flowing out of the port of the flushing pipe is changed by adjusting the water pressure in the water injection pipe, and the backwash water is adjusted to flush different positions of the gravel baffle by using the flushing pipes with different inclination angles.

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