Integrated water purification device based on magnetic loading precipitation and air flotation process

Abstract

The invention discloses an integrated water purification device based on a magnetic loading sedimentation and air floatation process, which comprises a quick mixing tank, a magnetic loading tank, a flocculation tank, a loading sedimentation tank, a sludge main pipe, a sludge reflux unit, a magnetic powder recovery unit and an air floatation separation unit, and the quick mixing tank, the magnetic loading tank, the flocculation tank and the loading sedimentation tank are sequentially arranged adjacently from left to right. An inclined pipe layer is arranged in the middle of the loading sedimentation tank, the air flotation separation unit comprises a U-shaped diversion trench, two first partition plates, a second partition plate, a first-stage water collection assembly, a second-stage water collection assembly and a dissolved air releaser, the U-shaped diversion trench is arranged above the inclined pipe layer, and a lower sedimentation area is arranged below the U-shaped diversion trench and the two first partition plates. An upper air flotation area is formed between the two second partition plates, a water outlet channel is arranged on the outer side of the upper air flotation area, and a slag collecting channel is arranged on the upper portion of the upper air flotation area. The system has the advantages of wide applicable water quality types, flexible operation, high automation degree, low operation energy consumption and better water treatment effect.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment, and in particular to an integrated water purification device based on magnetic loading precipitation and air flotation process. Background Art

[0002] In the field of water treatment, more stringent local sewage discharge standards have been implemented one after another, and the era of high standards and strict requirements has arrived. Traditional secondary sewage treatment has long been unable to meet the current national sewage discharge standards, and a series of tertiary deep treatment technologies have emerged. Traditional deep treatment processes mainly include: coagulation sedimentation, flotation, sand filter, rotary disc filter, drum filter, etc. In recent years, loading sedimentation tanks represented by magnetic coagulation sedimentation tanks have developed rapidly and have gradually been recognized and vigorously promoted in the water treatment market.

[0003] Since the magnetic coagulation sedimentation tank is loaded with magnetic powder heavy medium, the sedimentation speed of flocs is faster than that of ordinary coagulation sedimentation, which improves the treatment efficiency and effect. The flotation process has good effects in some industrial water fields and extreme phosphorus removal (such as TP≤0.05mg / L in the Dianchi Lake Basin). Although magnetic loading sedimentation tanks are widely used, they are not effective in treating some wastewaters containing light pollutants, such as grease, fiber, algae and wastewater containing surfactants, and cannot be directly discharged to meet the standards. Later, it is often necessary to add filtration units, which increases the land occupation and cost. The flotation process has significant advantages in the treatment of wastewater with light pollutants. However, the flotation process has poor treatment effect on pollutants with a large specific gravity. When the suspended solids in the influent are high (such as: SS≥100mg / L), it is difficult to achieve standard discharge by flotation process alone.

[0004] The Chinese patent with publication number CN221370888 U discloses an integrated device of ozone gas flotation and magnetic precipitation, including a coagulation tank, a dissolved air flotation tank, a magnetic loading tank, a flocculation tank, and a sedimentation tank. The technical solution is to add a coagulant to the coagulation tank of magnetic coagulation, and use ozone as the gas source and the precipitated water as the water source to release gas and water in the dissolved air flotation tank after the coagulation tank, and then react with a magnetic powder flocculant to perform solid-liquid separation in the sedimentation tank. The technology superficially combines the characteristics of ozone oxidation, dissolved air flotation and magnetic coagulation, but in reality, there is no mention of skimming the floating sludge after the dissolved air flotation. Instead, magnetic powder is added later, and finally settles in the sedimentation tank after PAM flocculation. Some light pollutants will still float in the sedimentation tank. The disordered coupling cannot fundamentally exert the significant advantages of the technology, affecting the effluent water quality, and the operating cost of ozone as a gas source is also high. The Chinese patent with publication number CN216998050 U discloses a sewage plant tailwater treatment system using magnetic coagulation as the main body, which adopts magnetic coagulation plus diffused air flotation technology. An aerator is arranged at the bottom of the magnetic mud flotation tank for flotation. No scraper is provided, and a scraper is used to remove the scum on the water surface. This technology uses diffused air flotation, and the bubbles are large. The contact between the bubbles and the suspended matter is not sufficient, and some tiny suspended matter in the water is not easy to be removed. The actual separation effect is not good, and there is no mud discharge pipeline at the bottom of the magnetic mud flotation tank. The magnetic mud is easily deposited for a long time, affecting the aeration effect. Based on the above analysis of the existing technology, the current technology cannot give full play to the advantages of the coupling technology from the root, and the disordered superposition cannot achieve the expected effect. The existing technology urgently needs further innovation and improvement. Summary of the invention

[0005] In view of the above-mentioned deficiencies of the prior art, one object of the present invention is to propose an integrated water purification device based on magnetic loading sedimentation and flotation process to solve the above-mentioned problems existing in the prior art.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] An integrated water purification device based on magnetic loading sedimentation and flotation process comprises a quick mixing tank, a magnetic loading tank, a flocculation tank, a loading sedimentation tank, a sludge main pipe, a sludge return unit, a magnetic powder recovery unit and an air flotation separation unit. The quick mixing tank, the magnetic loading tank, the flocculation tank and the loading sedimentation tank are arranged adjacent to each other from left to right. A water inlet is provided on one side of the lower part of the quick mixing tank, and the upper part thereof is communicated with the magnetic loading tank, the lower part of the magnetic loading tank is communicated with the flocculation tank, and the upper part of the flocculation tank is communicated with the loading sedimentation tank.

[0008] One end of the sludge main pipe is connected to the bottom of the loading sedimentation tank, and the other end is located outside the loading sedimentation tank and is closed. The sludge return unit and the magnetic powder recovery unit are arranged on the sludge main pipe in sequence. The sludge return unit sends part of the sludge in the sludge main pipe to the magnetic loading tank, and the magnetic powder recovery unit recovers the magnetic powder in the sludge main pipe and adds it to the magnetic loading tank.

[0009] A guide wall is arranged at the upper left side of the loading sedimentation tank close to the flocculation tank, and an inclined tube layer is arranged in the middle of the loading sedimentation tank. The inclined tube layer is arranged on the side of the guide wall away from the loading sedimentation tank.

[0010] The flotation separation unit includes a U-shaped guide groove, a first baffle, a second baffle, a primary water collection component, a secondary water collection component and a dissolved air releaser. The U-shaped guide groove is arranged horizontally above the inclined tube layer. There are two first baffles, which are horizontally arranged on the front and rear sides of the U-shaped guide groove respectively. The lower part of the U-shaped guide groove and the two first baffles is the lower sedimentation area.

[0011] There are two second baffles, which are vertically arranged on the front and rear sides of the U-shaped guide groove, and an upper flotation zone is formed between the two second baffles. The front and rear sides of the upper flotation zone are both provided with water outlet channels, and the front and rear sides of the upper part of the upper flotation zone are respectively provided with slag collecting channels.

[0012] The U-shaped guide trough is connected to the lower sedimentation area through a primary water collection component, and the outlet channel is connected to the bottom of the upper flotation area through a secondary water collection component. The dissolved air releaser is arranged at the lower inner part of the U-shaped guide trough and is connected to the pressurized dissolved air tank through a pipeline.

[0013] Furthermore, agitators are provided inside the quick mixing tank, magnetic loading tank and flocculation tank, a sludge hopper is provided at the bottom of the loading sedimentation tank, and one end of the sludge main pipe is connected to the sludge discharge port of the sludge hopper.

[0014] A four-arm heavy-duty scraper is arranged inside the loading sedimentation tank, and the scraper plates of the four-arm heavy-duty scraper are arranged adjacent to each other on the upper side of the conical surface of the sludge bucket.

[0015] Furthermore, the sludge return unit includes a sludge return pump and a sludge return pipe, the inlet end of the sludge return pump is connected to the sludge main pipe, one end of the sludge return pipe is connected to the outlet end of the sludge return pump, and the other end is connected to the upper part of the magnetic loading tank.

[0016] Furthermore, the magnetic powder recovery unit includes a magnetic powder recovery pump, a high shear machine 3 and a magnetic separator. The inlet end of the magnetic powder recovery pump is connected to the sludge main pipe, and the outlet end is connected to the inlet of the high shear machine 3 through the magnetic powder recovery pipe. The outlet of the high shear machine 3 is connected to the top of the magnetic loading tank through the magnetic separator.

[0017] Furthermore, a backup pump is arranged between the sludge return pump and the magnetic powder recovery pump, the inlet end of the backup pump is connected to the sludge main pipe, and the outlet end is connected to the inlet of the tee pipe. The two outlets of the tee pipe are respectively connected to the sludge return pipe and the magnetic powder recovery pipe through a return branch pipe, and each return branch pipe is provided with a stop valve.

[0018] Furthermore, the upper parts of the front and rear sides of the U-shaped guide groove are bent outwardly into an inclined shape, one end of the U-shaped guide groove is fixedly sealed and connected to the guide wall, and the other end is fixedly sealed and connected to the side wall of the loading sedimentation tank.

[0019] The bottom of the U-shaped guide groove is located below the two first baffles, the adjacent sides of the two first baffles are respectively fixedly sealed connected to the front and rear side walls of the U-shaped guide groove, one end of the first baffle is fixedly sealed connected to the guide wall, and the opposite sides of the two first baffles and the other ends are fixedly sealed connected to the side wall of the loading sedimentation tank.

[0020] Furthermore, the primary water collection assembly includes two groups of water collection pipes 1 symmetrically arranged on the front and rear sides of the U-shaped guide groove, and each group of water collection pipes 1 includes a plurality of water collection pipes 1 arranged in sequence at equal intervals laterally.

[0021] Each of the water collecting pipes is arranged longitudinally and horizontally, one end of which extends to the inside of the U-shaped guide groove and the other end is closed. The side surface of each water collecting pipe has a plurality of primary water inlet holes arranged at intervals along its length direction.

[0022] Furthermore, the lower end of the second partition is fixedly and sealedly connected to the first partition on the same side, and its left and right ends are respectively sealedly connected to the guide wall and the side wall of the loading sedimentation tank, and the outlet channel is formed between the opposite side of each second partition and the adjacent side wall of the loading sedimentation tank.

[0023] A strip bending plate is respectively provided on the upper part of one adjacent side of the two second partitions, the lower side of the strip bending plate is fixedly and sealedly connected to the adjacent second partition, the left and right ends are respectively sealedly connected to the guide wall and the side wall of the loading sedimentation tank, the upper end surface of the strip bending plate is lower than the upper end surface of the second partition, and the slag collecting channel is formed between each strip bending plate and the adjacent second partition.

[0024] Furthermore, the secondary water collection assembly includes two groups of water collection pipes 2 arranged at the bottom of the upper flotation area, and the two groups of water collection pipes 2 are symmetrically arranged on the front and rear sides of the U-shaped guide trough. Each group of water collection pipes 2 includes multiple water collection pipes 2 arranged in sequence with equal intervals in the transverse direction.

[0025] Each of the water collecting pipes 1 is arranged horizontally longitudinally, with one end close to the U-shaped guide groove closed and the other end extending into the outlet channel through the second partition on the same side. The top of each water collecting pipe 2 has multiple secondary water inlet holes arranged at intervals along its length.

[0026] Furthermore, two groups of dissolved air releasers are provided, each group of dissolved air releasers comprises a plurality of octopus-type dissolved air releasers arranged at linear intervals, each dissolved air releaser in the same group is connected in series to a conveying pipe, and the two conveying pipes are arranged in parallel in a U-shaped guide groove, one end of which is closed and the other end is connected to the outlet of the pressurized dissolved air tank.

[0027] By adopting the above technical solution, the beneficial technical effects of the present invention are:

[0028] 1. The present invention solves the problem of unsatisfactory sewage treatment effect and great application limitations caused by a single process.

[0029] 2. This device is not a simple series superposition of the magnetic loading sedimentation process and the air flotation process, but an organic combination of the two. Compared with single magnetic loading sedimentation or air flotation, it has a higher design surface load and treatment effect.

[0030] 3. The device has the advantages of being applicable to a wide range of water quality types, achieving high TP and SS standards, strong impact resistance, and saving space.

[0031] 4. The device can be operated flexibly. If the inlet water quality is good, you can choose to close the upper flotation zone function to save energy and pass water normally. If the inlet water quality is poor, you can enable the flotation slag discharge function to make the outlet water stable and meet the standards.

[0032] 5. The device is easy to operate, has a high degree of automation, low energy consumption, and has good economic, environmental and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of an integrated water purification device based on magnetic loading sedimentation and air flotation process of the present invention.

[0034] Figure 2 It is a right side view of the loading sedimentation tank and related parts of the present invention.

[0035] As shown in the figure: 1. Water inlet; 2. Mixer; 3. High shear machine; 4. Magnetic separator; 5. Sludge main pipe; 6. Magnetic powder recovery pump; 7. Standby pump; 8. Sludge return pump; 9. Magnetic powder recovery pipe; 10. Sludge return pipe; 11. Quick mixing tank; 12. Magnetic loading tank; 13. Flocculation tank; 14. Loading sedimentation tank; 15. Sludge hopper; 16. Four-arm heavy-duty scraper; 17. Inclined tube layer; 18. Primary water collection component; 19. Pressurized dissolved air tank; 20. Dissolved air releaser; 21. Slag collection channel; 22. Secondary water collection component; 23. Outlet channel; 24. U-shaped diversion trough; 25. First partition; 26. Second partition; 27. Diversion wall; 28. Three-way pipe. DETAILED DESCRIPTION

[0036] The present invention is described in detail below in conjunction with the accompanying drawings:

[0037] Combination Figure 1 and Figure 2An integrated water purification device based on magnetic loading sedimentation and flotation process includes a quick mixing tank 11, a magnetic loading tank 12, a flocculation tank 13, a loading sedimentation tank 14, a sludge main pipe 5, a sludge return unit, a magnetic powder recovery unit and an air flotation separation unit. The quick mixing tank 11, the magnetic loading tank 12, the flocculation tank 13 and the loading sedimentation tank 14 are arranged adjacent to each other from left to right. A water inlet 1 is provided on one side of the lower part of the quick mixing tank 11, and its upper part is communicated with the magnetic loading tank 12, the lower part of the magnetic loading tank 12 is communicated with the flocculation tank 13, and the upper part of the flocculation tank 13 is communicated with the loading sedimentation tank 14.

[0038] The quick mixing tank 11, the magnetic loading tank 12 and the flocculation tank 13 are all provided with a stirrer 2, the quick mixing tank 11 adds PAC flocculant, the magnetic loading tank 12 regularly adds magnetic powder, and the flocculation tank 13 adds PAM coagulant. During operation, the sewage enters the quick mixing tank 11 through the water inlet 1 and is quickly mixed with the PAC flocculant, enters the magnetic loading tank 12 through the upper part of the quick mixing tank 11 and is mixed with the magnetic powder, then enters the flocculation tank 13 through the bottom of the magnetic loading tank 12, and enters the loading sedimentation tank 14 from the upper part of the flocculation tank 13. The water flow velocity of the sewage from the quick mixing tank 11 to the flocculation tank 13 is 0.2-0.5m / s.

[0039] One end of the sludge main pipe 5 is connected to the bottom of the loading sedimentation tank 14, and the other end is located outside the loading sedimentation tank 14 and is closed. Specifically, a sludge hopper 15 is provided at the bottom of the loading sedimentation tank 14, and one end of the sludge main pipe 5 is connected to the sludge discharge port of the sludge hopper 15. A four-arm heavy-duty scraper 16 is provided inside the loading sedimentation tank 14, and the scraping plates of the four-arm heavy-duty scraper 16 are arranged adjacent to each other on the upper side of the conical surface of the sludge hopper 15.

[0040] The sludge return unit and the magnetic powder recovery unit are sequentially arranged on the sludge main pipe 5. The sludge return unit sends part of the sludge in the sludge main pipe 5 to the magnetic loading pool 12, and the magnetic powder recovery unit recovers the magnetic powder in the sludge main pipe 5 and adds it to the magnetic loading pool 12. The sludge return unit includes a sludge return pump 8 and a sludge return pipe 10. The inlet end of the sludge return pump 8 is connected to the sludge main pipe 5, and one end of the sludge return pipe 10 is connected to the outlet end of the sludge return pump 8, and the other end is connected to the upper part of the magnetic loading pool 12.

[0041] The sludge return unit includes a sludge return pump 8 and a sludge return pipe 10. The inlet end of the sludge return pump 8 is connected to the sludge main pipe 5. One end of the sludge return pipe 10 is connected to the outlet end of the sludge return pump 8, and the other end is connected to the upper part of the magnetic loading pool 12. The magnetic powder recovery unit includes a magnetic powder recovery pump 6, a high shear machine 3 and a magnetic separator 4. The inlet end of the magnetic powder recovery pump 6 is connected to the sludge main pipe 5, and its outlet end is connected to the inlet of the high shear machine 3 through the magnetic powder recovery pipe 9. The outlet of the high shear machine 3 is connected to the top of the magnetic loading pool 12 through the magnetic separator 4. The core magnetic field strength of the magnetic separator 4 is ≥6000Gs, which improves the magnetic powder recovery efficiency and reduces the magnetic powder loss. The high shear machine 3 adopts double-layer or triple-layer wear-resistant alloy blades to improve the separation effect of mud magnetism.

[0042] The magnetic powder recovery pump 6 delivers the magnetic powder sludge to the high shear machine 3 through the magnetic powder recovery pipe 9. The high-speed rotating blades of the high shear machine 3 break up the magnetic powder sludge to pave the way for the recovery of the magnetic powder medium. Then, the magnetic powder medium enters the magnetic separator 4. Through the efficient recovery of the magnetic separator 4, the magnetic powder medium is recovered and flows into the magnetic loading tank 12. The remaining sludge flows into the sludge temporary storage tank by gravity. The sludge return pump 8 returns the magnetic powder sludge to the magnetic loading tank 12 through the sludge return pipeline 10 to maintain the concentration of magnetic powder sludge in the system and improve the efficiency of the use of the agent.

[0043] A standby pump 7 is arranged between the sludge return pump 8 and the magnetic powder recovery pump 6. The inlet end of the standby pump 7 is connected to the sludge main pipe 5, and the outlet end is connected to the inlet of the tee pipe 28. The two outlets of the tee pipe 28 are respectively connected to the sludge return pipe 10 and the magnetic powder recovery pipe 9 through a return branch pipe. Each return branch pipe is provided with a stop valve. When the sludge return pump 8 or the magnetic powder recovery pump 6 needs to be shut down for inspection or maintenance, the standby pump 7 will replace its work.

[0044] A guide wall 27 is provided at the upper left side of the loading sedimentation tank 14 near the flocculation tank 13, and an inclined tube layer 17 is provided in the middle of the loading sedimentation tank 14. The inclined tube layer 17 is arranged on the side of the guide wall 27 away from the loading sedimentation tank 14. The magnetic powder sludge flocs after magnetic mixing flocculation enter the loading sedimentation tank 14 and move downward along the guide wall 27. The magnetic powder sludge flocs with high specific gravity will settle to the bottom of the sedimentation area through the inclined tube 17 layer, and the magnetic powder sludge will be collected into the sludge hopper 15 by the four-arm heavy-duty scraper 16.

[0045] The flotation separation unit includes a U-shaped guide groove 24, a first baffle 25, a second baffle 26, a primary water collection component 18, a secondary water collection component 22 and a dissolved air releaser 20. The U-shaped guide groove 24 is arranged horizontally above the inclined tube layer 17. The upper parts of the front and rear sides of the U-shaped guide groove 24 are bent outward into an inclined shape. One end of the U-shaped guide groove 24 is fixedly and sealedly connected to the guide wall 27, and the other end is fixedly and sealedly connected to the side wall of the loading sedimentation tank 14.

[0046] There are two first baffles 25, which are horizontally arranged at the front and rear sides of the U-shaped guide groove 24. The lower part of the U-shaped guide groove 24 and the two first baffles 25 is the lower sedimentation area. The design surface load of the lower sedimentation area is 20-35m 3 / (m 2 h), mainly to remove particles and suspended solids that are easy to load and settle.

[0047] The bottom of the U-shaped guide groove 24 is located below the two first baffles 25, and the adjacent sides of the two first baffles 25 are respectively fixedly sealed connected to the front and rear side walls of the U-shaped guide groove 24, one end of the first baffle 25 is fixedly sealed connected to the guide wall 27, and the opposite sides of the two first baffles 25 and the other ends are fixedly sealed connected to the side wall of the loading sedimentation tank 14.

[0048] There are two second baffles 26, which are vertically arranged at the front and rear sides of the U-shaped guide groove 24, and an upper flotation zone is formed between the two second baffles 26. The total hydraulic retention time of the upper flotation zone is 18 to 25 minutes, which is mainly used to remove light particles, suspended matter, grease and other substances that are not easy to settle.

[0049] Outlet channels 23 are provided on the outside of the front and rear sides of the upper flotation zone. Specifically, the lower end of the second baffle 26 is fixedly and sealedly connected to the first baffle 25 on the same side, and its left and right ends are respectively sealedly connected to the guide wall 27 and the side wall of the loading sedimentation tank 14. The outlet channel 23 is formed between the opposite side of each second baffle 26 and the adjacent side wall of the loading sedimentation tank 14.

[0050] A slag collecting channel 21 is respectively provided on the front and rear sides of the upper part of the upper flotation zone, and a strip bending plate is respectively provided on the upper part of the adjacent side of the two second baffles 26. The lower side of the strip bending plate is fixedly and sealedly connected to the adjacent second baffle 26, and the left and right ends are respectively sealedly connected to the guide wall 27 and the side wall of the loading sedimentation tank 14. The upper end surface of the strip bending plate is lower than the upper end surface of the second baffle 26, and the slag collecting channel 21 is formed between each strip bending plate and the adjacent second baffle 26.

[0051] The U-shaped guide trough 24 is connected to the lower sedimentation area through a primary water collecting assembly 18. The primary water collecting assembly 18 includes two groups of water collecting pipes 1 symmetrically arranged on the front and rear sides of the U-shaped guide trough 24. Each group of water collecting pipes 1 includes multiple water collecting pipes 1 arranged in sequence and at equal intervals laterally.

[0052] Each of the water collecting pipes 1 is arranged horizontally in the longitudinal direction, one end of which extends to the inside of the U-shaped guide groove 24 and the other end is closed. The side of each water collecting pipe 1 has a plurality of primary water inlet holes arranged at intervals along its length. The flow rate of the primary water inlet hole is preferably controlled to be 0.4-0.6 m / s, which is used to collect the effluent and flow into the upper flotation area through the inside of the U-shaped guide groove 24. The function of the water collecting pipe 1 is to allow the supernatant above the inclined tube layer 17 to slowly enter the interior of the water collecting pipe 1, and reach the inner side of the U-shaped guide groove 24 through the water collecting pipe 1, thereby reducing the disturbance to the water body between the inclined tube layer 17 and the first partition plate 25, and accelerating the sedimentation process of the magnetic powder sludge flocs with a large specific gravity through the inclined tube layer 17 to the bottom of the loading sedimentation tank 14. Light particles, suspended matter, oils and other substances that are not easy to settle, such as grease, flow through the water collecting pipe 1 and enter the inner side of the U-shaped guide groove 24, where they combine with dissolved air to form scum floating on the water surface, and enter the slag collecting channel 21 for collection.

[0053] The secondary water collecting assembly 22 includes two groups of water collecting pipes 2 arranged at the bottom of the upper air flotation area. The two groups of water collecting pipes 2 are symmetrically arranged on the front and rear sides of the U-shaped guide groove 24. Each group of water collecting pipes 2 includes multiple water collecting pipes 2 arranged in sequence at equal intervals in the transverse direction.

[0054] Each of the water collecting pipes 1 is arranged horizontally in the longitudinal direction, one end of which is close to the U-shaped guide groove 24 is closed, and the other end passes through the second partition plate 26 on the same side and extends into the outlet channel 23. The top of each water collecting pipe 2 has a plurality of secondary water inlet holes arranged at intervals along its length. The flow rate of the secondary water inlet hole is preferably controlled to be: 0.4-0.6m / s. The clean water at the bottom of the upper air flotation area slowly flows into the interior of the water collecting pipe 2 through the secondary water inlet hole, reducing the disturbance of the water body at the bottom of the upper air flotation area caused by too fast flow rate, and improving the water purification effect.

[0055] The dissolved air releaser 20 is arranged at the lower inner part of the U-shaped guide groove 24, and is connected to the outlet of the pressurized dissolved air tank 19 through a pipeline. Specifically, the dissolved air releaser 20 is provided with two groups, each group of dissolved air releasers 20 includes a plurality of octopus-type dissolved air releasers 20 arranged linearly at intervals, and each dissolved air releaser 20 in the same group is connected in series to a delivery pipe, and the two delivery pipes are arranged in parallel in the U-shaped guide groove 24, one end of which is closed and the other end is connected to the outlet of the pressurized dissolved air tank 19.

[0056] The supernatant after loading sedimentation separation enters the inner side of the U-shaped guide trough 24 through the primary water collection component 18 and reaches the upper flotation area. A large amount of dissolved air water is pumped into the dissolved air releaser 20 in the dissolved air release area through the pressurized dissolved air tank 19, and a large amount of dissolved air water is released to further remove light pollutants that are difficult to remove by loading sedimentation. Light pollutants are discharged from the system through the slag collection channel 21, and the lower layer of clear water after separation in the upper flotation area flows into the outlet channel 23 through the secondary water collection component 22, achieving high standards of TP and SS.

[0057] The present invention was applied to an industrial wastewater treatment plant in Shandong to treat the effluent from the secondary sedimentation tank. The designed water treatment capacity of the water plant was 5000m 3 / d, the device adopts an integrated steel structure, and the surface load design value is 26.5m 3 / (m 2 h) The effluent is designed in accordance with Quasi-IV discharge standards.

[0058] The inlet and outlet water quality is detailed in the table below:

[0059] index COD(mg / L) TP(mg / L) SS(mg / L) Influent mean 33 1.6 35 Average water output 26 0.05 5

[0060] As can be seen from the table above, the water purification device of the present invention can be used to treat the industrial sewage, and the effluent index can stably reach the quasi-IV effluent discharge standard. In particular, it has an excellent treatment effect on TP and SS, and has good economic, environmental and social benefits.

[0061] Parts not described in the present invention can be implemented by adopting or drawing on existing technologies.

[0062] Furthermore, the terms “first” and “second” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0063] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "front", "back", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0064] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. An integrated water purification device based on magnetic loading precipitation and air flotation process, characterized in that: It includes a quick mixing tank, a magnetic loading tank, a flocculation tank, a loading sedimentation tank, a sludge main pipe, a sludge return unit, a magnetic powder recovery unit and an air flotation separation unit. The quick mixing tank, the magnetic loading tank, the flocculation tank and the loading sedimentation tank are arranged adjacent to each other from left to right. A water inlet is provided on one side of the lower part of the quick mixing tank, and the upper part thereof is communicated with the magnetic loading tank, the lower part of the magnetic loading tank is communicated with the flocculation tank, and the upper part of the flocculation tank is communicated with the loading sedimentation tank; One end of the sludge main pipe is connected to the bottom of the loading sedimentation tank, and the other end is located outside the loading sedimentation tank and is closed. The sludge return unit and the magnetic powder recovery unit are sequentially arranged on the sludge main pipe. The sludge return unit sends part of the sludge in the sludge main pipe to the magnetic loading tank, and the magnetic powder recovery unit recovers the magnetic powder in the sludge main pipe and adds it to the magnetic loading tank. A guide wall is provided at the upper left side of the loading sedimentation tank near the flocculation tank, and an inclined tube layer is provided in the middle of the loading sedimentation tank. The inclined tube layer is arranged on the side of the guide wall away from the loading sedimentation tank. The air flotation separation unit comprises a U-shaped guide groove, a first baffle, a second baffle, a primary water collection component, a secondary water collection component and a dissolved air releaser. The U-shaped guide groove is arranged horizontally above the inclined tube layer. There are two first baffles, which are horizontally arranged at the front and rear sides of the U-shaped guide groove respectively. The lower part of the U-shaped guide groove and the two first baffles is the lower sedimentation area. There are two second baffles, which are vertically arranged at the front and rear sides of the U-shaped guide groove, respectively. An upper flotation zone is formed between the two second baffles. Outlet channels are arranged outside the front and rear sides of the upper flotation zone, and slag collecting channels are arranged at the front and rear sides of the upper part of the upper flotation zone. The U-shaped guide trough is connected to the lower sedimentation area through a primary water collection component, and the outlet channel is connected to the bottom of the upper flotation area through a secondary water collection component. The dissolved air releaser is arranged at the lower inner part of the U-shaped guide trough and is connected to the pressurized dissolved air tank through a pipeline.

2. The integrated water purification device based on magnetic loading precipitation and air flotation process according to claim 1 is characterized in that: Agitators are provided inside the quick mixing tank, magnetic loading tank and flocculation tank. A sludge hopper is provided at the bottom of the loading sedimentation tank, and one end of the sludge main pipe is connected to the sludge discharge port of the sludge hopper. A four-arm heavy-duty scraper is arranged inside the loading sedimentation tank, and the scraper plates of the four-arm heavy-duty scraper are arranged adjacent to each other on the upper side of the conical surface of the sludge bucket.

3. The integrated water purification device based on magnetic loading precipitation and air flotation process according to claim 1 is characterized in that: The sludge return unit comprises a sludge return pump and a sludge return pipe. The inlet end of the sludge return pump is connected to the sludge main pipe. One end of the sludge return pipe is connected to the outlet end of the sludge return pump, and the other end is connected to the upper part of the magnetic loading tank.

4. The integrated water purification device based on magnetic loading precipitation and air flotation process according to claim 3 is characterized in that: The magnetic powder recovery unit includes a magnetic powder recovery pump, a high shear machine 3 and a magnetic separator. The inlet end of the magnetic powder recovery pump is connected to the sludge main pipe, and the outlet end is connected to the inlet of the high shear machine 3 through the magnetic powder recovery pipe. The outlet of the high shear machine 3 is connected to the top of the magnetic loading tank through the magnetic separator.

5. The integrated water purification device based on magnetic loading precipitation and air flotation process according to claim 4 is characterized in that: A standby pump is arranged between the sludge return pump and the magnetic powder recovery pump. The inlet end of the standby pump is connected to the sludge main pipe, and the outlet end is connected to the inlet of the tee pipe. The two outlets of the tee pipe are respectively connected to the sludge return pipe and the magnetic powder recovery pipe through a return branch pipe, and each return branch pipe is provided with a stop valve.

6. The integrated water purification device based on magnetic loading precipitation and air flotation process according to claim 1 is characterized in that: The upper parts of the front and rear sides of the U-shaped guide groove are bent outwards into an inclined shape, one end of the U-shaped guide groove is fixedly sealed and connected to the guide wall, and the other end is fixedly sealed and connected to the side wall of the loading sedimentation tank; The bottom of the U-shaped guide groove is located below the two first baffles, the adjacent sides of the two first baffles are respectively fixedly sealed connected to the front and rear side walls of the U-shaped guide groove, one end of the first baffle is fixedly sealed connected to the guide wall, and the opposite sides of the two first baffles and the other ends are fixedly sealed connected to the side wall of the loading sedimentation tank.

7. The integrated water purification device based on magnetic loading precipitation and air flotation process according to claim 6 is characterized in that: The primary water collection assembly includes two groups of water collection pipes 1 symmetrically arranged on the front and rear sides of the U-shaped guide groove, and each group of water collection pipes 1 includes a plurality of water collection pipes 1 arranged in sequence at equal intervals in the transverse direction; Each of the water collecting pipes is arranged longitudinally and horizontally, one end of which extends to the inside of the U-shaped guide groove and the other end is closed. The side surface of each water collecting pipe has a plurality of primary water inlet holes arranged at intervals along its length direction.

8. The integrated water purification device based on magnetic loading precipitation and air flotation process according to claim 1 is characterized in that: The lower end of the second partition is fixedly and sealedly connected to the first partition on the same side, and the left and right ends thereof are respectively and sealedly connected to the guide wall and the side wall of the loading sedimentation tank, and the outlet channel is formed between the opposite side of each second partition and the adjacent side wall of the loading sedimentation tank; A strip bending plate is respectively provided on the upper part of one adjacent side of the two second partitions, the lower side of the strip bending plate is fixedly and sealedly connected to the adjacent second partition, the left and right ends are respectively sealedly connected to the guide wall and the side wall of the loading sedimentation tank, the upper end surface of the strip bending plate is lower than the upper end surface of the second partition, and the slag collecting channel is formed between each strip bending plate and the adjacent second partition.

9. The integrated water purification device based on magnetic loading precipitation and air flotation process according to claim 8, characterized in that: The secondary water collection assembly includes two groups of water collection pipes 2 arranged at the bottom of the upper air flotation area, the two groups of water collection pipes 2 are symmetrically arranged on the front and rear sides of the U-shaped guide trough, and each group of water collection pipes 2 includes a plurality of water collection pipes 2 arranged in sequence at equal intervals in the transverse direction; Each of the water collecting pipes 1 is arranged horizontally longitudinally, with one end close to the U-shaped guide groove closed and the other end extending into the outlet channel through the second partition on the same side. The top of each water collecting pipe 2 has multiple secondary water inlet holes arranged at intervals along its length.

10. The integrated water purification device based on magnetic loading precipitation and air flotation process according to claim 1, characterized in that: There are two groups of dissolved air releasers, each group of dissolved air releasers includes a plurality of octopus-type dissolved air releasers arranged at linear intervals, and each dissolved air releaser in the same group is connected in series to a conveying pipe. The two conveying pipes are arranged in parallel in a U-shaped guide groove, one end of which is closed and the other end is connected to the outlet of the pressurized dissolved air tank.

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