Recovery equipment and recovery method for backwashing water of activated carbon filter

Abstract

The present invention discloses an activated carbon filter backwashing water recovery device and a recovery method, and relates to the technical field of wastewater treatment, the activated carbon filter backwashing water recovery device comprises: a precipitation cylinder, the interior of which defines a precipitation chamber; the supporting column is vertically arranged in the middle of the precipitation chamber; and the auxiliary precipitation plate is vertically arranged between the supporting column and the inner side wall of the precipitation barrel, divides the precipitation cavity into an inner cavity and an outer cavity, and is made of a permanent magnet. The auxiliary precipitation plate made of the permanent magnet assists in adsorbing floccules in the process that backwashing water moves from the first water inlet to the first water outlet, and when the backwashing water flows out of the first water outlet, the floccules are completely settled or adsorbed on the front side and the rear side of the auxiliary precipitation plate, compared with the prior art, the time of the precipitation step is greatly shortened, and the precipitation efficiency is improved. The continuous precipitation process can be realized, and the continuous operation of primary filtration, precipitation and ultrafiltration is realized.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment, and in particular to an activated carbon filter backwash water recovery device and a recovery method. Background Art

[0002] Activated carbon filter backwash water recovery is an important water treatment technology that can effectively recover and reuse the wastewater generated during the backwash process of the activated carbon filter. The recovery method is to mix the backwash water with the raw water. The advantages of this recovery method are simplicity and reduced recovery costs. However, the activated carbon filter backwash water contains a large amount of microorganisms, organic matter and particulate matter. Direct mixing of backwash water with raw water may cause problems such as increased dissolved organic matter content in coagulated water and microbial leakage.

[0003] The existing technology generally filters the wastewater before mixing it with raw water. The conventional filtration mode is primary filtration-sedimentation-ultrafiltration, wherein the primary filtration step can filter out large particles of impurities in the wastewater, and the sedimentation step adds flocculants to the sedimentation tank to promote the aggregation of suspended particles and microorganisms in the wastewater to form flocs and settle to the bottom of the sedimentation tank. Ultrafiltration uses membrane separation technology, and the pore size of the membrane is usually around 0.01 microns, which can intercept small particles of impurities in the wastewater. The three steps work synergistically to ensure the quality of recycled water.

[0004] However, this filtering mode has the following problems:

[0005] 1. In the sedimentation step, the formation and sedimentation of floccules usually takes 1-1.5 hours, which results in the discontinuity of the entire filtration mode and the inability to form a continuously operating wastewater filtration system.

[0006] 2. During the ultrafiltration step, there are still a large number of small particle impurities in the wastewater. Long-term use of the ultrafiltration membrane can easily lead to clogging of the ultrafiltration membrane, especially when there are viscous impurities in the wastewater, the clogging problem of the ultrafiltration membrane is more serious.

[0007] In view of this, how to provide an activated carbon filter backwash water recovery device that can fully or partially solve the above-mentioned technical problems is an issue that technical personnel in this field urgently need to solve. Summary of the invention

[0008] The purpose of the present invention is to provide an activated carbon filter backwash water recovery device and a recovery method to solve the problems existing in the prior art.

[0009] To achieve the above object, the present invention provides the following solution: The present invention provides an activated carbon filter backwash water recovery device, comprising:

[0010] A sedimentation cylinder, defining a sedimentation chamber therein;

[0011] A support column is vertically arranged in the middle of the precipitation chamber;

[0012] An auxiliary sedimentation plate is vertically arranged between the support and the inner side wall of the sedimentation cylinder to divide the sedimentation chamber into an inner chamber and an outer chamber, and the auxiliary sedimentation plate is made of a permanent magnet; the sedimentation cylinder has a first water inlet and a first water outlet connected to the sedimentation chamber, and backwash water can enter the inner chamber and the outer chamber from the first water inlet and flow upward, and floccules in the backwash water can be adsorbed on the front and back sides of the auxiliary sedimentation plate. When the backwash water flows to the top of the inner chamber and the outer chamber, the backwash water does not contain floccules and can flow out from the first water outlet.

[0013] The beneficial effects of the present invention are:

[0014] An auxiliary sedimentation plate made of permanent magnets assists in the adsorption of floccules during the process of backwash water moving from the first water inlet to the first water outlet. When the backwash water flows out from the first water outlet, the floccules are all settled or adsorbed on the front and back sides of the auxiliary sedimentation plate. Compared with the prior art, the sedimentation step time is greatly reduced, and the sedimentation process can be continuous, and the continuous operation of primary filtration-sedimentation-ultrafiltration can be achieved.

[0015] Furthermore, it also includes: a flocculant delivery mechanism, which is arranged near the first water inlet and is used to deliver flocculants into the sedimentation chamber; the inner side walls of the support and the sedimentation cylinder are 10-15 cm away from the auxiliary sedimentation plate.

[0016] The beneficial effects of adopting the above technical solution are:

[0017] The flocculant delivery mechanism is arranged near the first water inlet. When the backwash water enters the sedimentation chamber, it can be quickly mixed with the flocculant, so that the floccules can be fully coagulated in the early stage of sedimentation and completely coagulated when rising to the corresponding height of the auxiliary sedimentation plate, thereby ensuring that the floccules can be adsorbed on the auxiliary sedimentation plate.

[0018] In addition, the pillar is arranged in the middle of the sedimentation chamber, which reduces the radial width of the sedimentation chamber. The auxiliary sedimentation plate is vertically arranged between the pillar and the inner side wall of the sedimentation cylinder, and the auxiliary sedimentation plate is 10-15cm away from the inner and outer chambers. When the backwash water flows, it is located in the inner chamber and the outer chamber. The distance between the floccules and the auxiliary sedimentation plate is small, which can ensure that the distance between the floccules in the backwash water and the auxiliary sedimentation plate is close enough, which is conducive to the auxiliary sedimentation plate to quickly and comprehensively adsorb the floccules. The pillar limits the inner chamber and the outer chamber to the outside of the pillar. The inner diameter corresponding to the inner chamber and the outer chamber is larger, so the inner chamber and the outer chamber can ensure sufficient cross-sectional area to ensure the flow volume of the backwash water.

[0019] Furthermore, it also includes:

[0020] A bottom plate, the auxiliary sedimentation plate is arranged on the bottom plate, the bottom plate is located above the first water inlet and is fixedly connected to the inner wall of the sedimentation cylinder.

[0021] Furthermore, it also includes:

[0022] An inner cleaning ring adapted to the cross-sectional shape of the inner chamber and correspondingly arranged above the inner chamber;

[0023] An outer cleaning ring adapted to the cross-sectional shape of the outer chamber and correspondingly arranged above the outer chamber;

[0024] The long-axis cylinder is fixedly connected to the top surfaces of the inner cleaning ring and the outer cleaning ring, and is used for driving the inner cleaning ring and the outer cleaning ring to move up and down.

[0025] The beneficial effects of adopting the above technical solution are:

[0026] The auxiliary sedimentation plate is arranged on the bottom plate. On the one hand, the bottom plate provides a stable support effect for the auxiliary sedimentation plate. On the other hand, the arrangement of the bottom plate makes any position of the inner and outer surfaces of the auxiliary sedimentation plate within the cleaning range of the inner cleaning ring and the outer cleaning ring. When the long-axis cylinder drives the inner and outer cleaning rings to move downward, the flocs adsorbed on the inner and outer surfaces of the auxiliary sedimentation plate can be pushed to the bottom of the sedimentation chamber, completing the self-cleaning operation of the auxiliary sedimentation plate. At the same time, it also helps the flocs to gather at the bottom of the sedimentation chamber, which is convenient for centralized treatment later.

[0027] Furthermore, it also includes:

[0028] An ultrafiltration cartridge defines an ultrafiltration chamber therein;

[0029] A water inlet cylinder is arranged in the middle of the ultrafiltration chamber, the water inlet cylinder has a second water inlet and a second water outlet, the second water inlet is connected to the first water outlet, and the second water outlet is connected to the ultrafiltration chamber;

[0030] An ultrafiltration membrane is disposed between the water inlet cylinder and the inner side wall of the ultrafiltration cylinder;

[0031] A bubble flushing mechanism, connected to the air supply mechanism, is used to blow bubbles toward the lower surface of the ultrafiltration membrane;

[0032] A drain port is connected to the ultrafiltration chamber and is located above the ultrafiltration membrane; the backwash water enters the water inlet cylinder through the first water outlet and the second water inlet, flows downward along the water inlet cylinder and flows into the ultrafiltration chamber from the second water outlet, passes through the ultrafiltration membrane and is discharged from the drain port;

[0033] The sewage outlet is connected with the ultrafiltration chamber, and the connection point is close to the bottom of the ultrafiltration chamber.

[0034] The beneficial effects of adopting the above technical solution are:

[0035] Backwash water passes through the ultrafiltration membrane from bottom to top to realize ultrafiltration operation. Most of the impurities trapped can be separated from the ultrafiltration membrane by gravity and settle to the bottom of the ultrafiltration chamber, and some impurities are trapped on the lower surface of the ultrafiltration membrane. During the ultrafiltration process, the bubble flushing mechanism continuously blows bubbles to the lower surface of the ultrafiltration membrane. The bubbles can separate the trapped non-viscous impurities from the ultrafiltration membrane and then settle to the bottom of the ultrafiltration chamber. Compared with the existing technology, the self-cleaning function of the ultrafiltration membrane can be realized.

[0036] Furthermore, the water inlet cylinder and the inner wall of the ultrafiltration cylinder are spaced 15-20 cm apart.

[0037] The bubble flushing mechanism is used to use bubbles to flush the lower surface of the ultrafiltration membrane. Unlike other flushing media, bubbles have their own characteristics. Bubbles are greatly affected by water resistance when moving in water and cannot move horizontally over long distances. In order to ensure that the lower surface of the ultrafiltration membrane can be fully and comprehensively flushed, this application limits its width to 15-20cm to ensure that the bubbles output by the bubble flushing mechanism can fully cover all positions on the lower surface of the ultrafiltration membrane.

[0038] Furthermore, it also includes:

[0039] A self-cleaning mechanism, connected to the water supply mechanism, for spraying clean water onto the upper surface of the ultrafiltration membrane;

[0040] A sewage valve, arranged on the sewage outlet, for opening and closing the sewage outlet;

[0041] A drain valve is arranged on the drain outlet and is used for opening and closing the drain outlet.

[0042] The beneficial effects of adopting the above technical solution are:

[0043] The self-cleaning mechanism can realize the backwashing function of the ultrafiltration membrane when the sewage valve is open and the drain valve is closed, so that clean water passes through the ultrafiltration membrane from top to bottom, and the impurities trapped under the ultrafiltration membrane are further washed downward, thereby improving the self-cleaning effect of the ultrafiltration membrane.

[0044] Furthermore, it also includes:

[0045] A lifting mechanism, wherein the top outer edge of the water inlet cylinder is fixedly connected to the inner side wall of the ultrafiltration cylinder through a connecting block, and the lifting mechanism is arranged at the bottom of the connecting block;

[0046] A clamp, arranged on the lifting mechanism;

[0047] The electric heating ring is arranged between the inner wall of the water inlet cylinder and the ultrafiltration cylinder and clamped on the clamp. The lifting mechanism is used to drive the electric heating ring to approach or move away from the ultrafiltration membrane. When the electric heating ring is close to the ultrafiltration membrane, the electric heating ring can heat the ultrafiltration membrane.

[0048] The beneficial effects of adopting the above technical solution are:

[0049] When there are sticky impurities in the backwash water, the sticky impurities can firmly adhere to the lower surface of the ultrafiltration membrane. It is difficult to separate the sticky impurities from the ultrafiltration membrane by relying on bubble flushing or clean water backwashing.

[0050] The present application heats the ultrafiltration membrane by an electric heating ring at a position close to the upper surface of the ultrafiltration membrane. After the viscous impurities are heated, the viscosity is generally reduced. At this time, bubble flushing or clean water backwashing can easily separate the viscous impurities from the ultrafiltration membrane, further improving the self-cleaning effect of the ultrafiltration membrane. Under normal conditions, the electric heating ring is moved by the lifting mechanism to a position away from the ultrafiltration membrane, which does not affect the backwash water flow and will not be corroded.

[0051] Furthermore, the clamp is a U-shaped ring, there are at least two lifting mechanisms and they are arranged on both sides of the water inlet cylinder, the top of the U-shaped ring is connected to the lifting mechanism, and the electric heating ring is welded in the through groove of the U-shaped ring.

[0052] The beneficial effects of adopting the above technical solution are:

[0053] Compared with other clamps, the U-shaped ring has a smaller contact area with the electric heating ring, which can prevent the clamp's own structure from hindering the heat exchange between the electric heating ring and the ultrafiltration membrane.

[0054] The present invention also provides an activated carbon filter backwash water recovery method, using the activated carbon filter backwash water recovery device, comprising the following steps:

[0055] S1: Backwash water enters the sedimentation chamber from the first water inlet, and the flocculant delivery mechanism delivers flocculant into the sedimentation chamber. The flocculant and backwash water are mixed to form flocs. The backwash water is divided into the inner chamber and the outer chamber, and flows from bottom to top along the height direction of the auxiliary sedimentation plate. After 10-15 minutes, the backwash water flows from the first water inlet to the first water outlet, and the flocs are all adsorbed on the front and rear sides of the auxiliary sedimentation plate or settled to the bottom of the sedimentation chamber;

[0056] S2: The backwash water enters the water inlet cylinder from the first water outlet and the second water inlet and flows downward, and enters the ultrafiltration chamber from the second water outlet; the backwash water passes through the ultrafiltration membrane from bottom to top to intercept the impurities and settle them to the bottom of the ultrafiltration chamber, and the backwash water is discharged from the drain port;

[0057] S3: The bubble flushing mechanism blows bubbles to the lower surface of the ultrafiltration membrane, so that the impurities trapped on the lower surface of the ultrafiltration membrane are separated from the ultrafiltration membrane and settled to the bottom of the ultrafiltration chamber;

[0058] S4: When sticky impurities adhere to the lower surface of the ultrafiltration membrane, the lifting mechanism moves the electric heating ring to a position close to the upper surface of the ultrafiltration membrane through the clamp, and heats the ultrafiltration membrane through the electric heating ring to reduce the viscosity of the sticky impurities; close the drain valve and the drain port, open the sewage valve to connect the sewage port with the ultrafiltration chamber, and the self-cleaning mechanism sprays clean water on the upper surface of the ultrafiltration membrane. The clean water passes through the ultrafiltration membrane from top to bottom to separate the sticky impurities from the ultrafiltration membrane and settle to the bottom of the ultrafiltration chamber.

[0059] The beneficial effects of the present invention are:

[0060] 1. When the backwash water enters the sedimentation chamber, it quickly mixes with the flocculant to form flocs. The flow time of the backwash water from the first water inlet to the first water outlet is set to 10-15 minutes. When the backwash water flows to the first water outlet, all the flocs in the backwash water are adsorbed on the front and back sides of the auxiliary sedimentation plate or settle to the bottom of the sedimentation chamber. In combination with the primary filtration and ultrafiltration steps, the continuity of the primary filtration-sedimentation-ultrafiltration process can be achieved.

[0061] 2. Backwash water passes through the ultrafiltration membrane from top to top to achieve ultrafiltration. During the process, the bubble flushing mechanism blows bubbles to the lower surface of the ultrafiltration membrane, separating the impurities trapped on the lower surface of the ultrafiltration membrane from the ultrafiltration membrane and settling them to the bottom of the ultrafiltration chamber, reducing the impurities trapped on the lower surface of the ultrafiltration membrane.

[0062] 3. The electric heating ring can approach the upper surface of the ultrafiltration membrane and heat the ultrafiltration membrane. Combined with the bubble flushing mechanism and the self-cleaning mechanism, it can separate the sticky impurities from the ultrafiltration membrane, ensuring that the ultrafiltration membrane is not blocked during long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0064] Figure 1 This is a schematic diagram of the structure of the sedimentation tube of the present invention;

[0065] Figure 2 This is a schematic diagram of the structure of the sedimentation cylinder after the top cover is removed;

[0066] Figure 3 This is the front view of the interior of the sedimentation cylinder;

[0067] Figure 4 It is a schematic diagram of the structure of the inner cleaning ring and the outer cleaning ring;

[0068] Figure 5 This is a schematic diagram of the connection between the sedimentation cartridge and the ultrafiltration cartridge;

[0069] Figure 6 It is a schematic diagram of the structure of the ultrafiltration cartridge;

[0070] Figure 7 This is a front view of the interior of the ultrafiltration cartridge;

[0071] Among them, 1. sedimentation cylinder; 101. first water inlet; 102. first water outlet; 103. inner chamber; 104. outer chamber; 2. top cover; 3. pillar; 4. auxiliary sedimentation plate; 5. first annular flow channel; 6. flocculant delivery nozzle; 7. bottom plate; 8. inner cleaning ring; 9. outer cleaning ring; 10. long-axis cylinder; 11. ultrafiltration cylinder; 1101. ultrafiltration chamber; 12. water inlet cylinder; 1201. second water inlet; 1202. second water outlet; 13. sealing cover; 14. fluid pipeline; 15. ultrafiltration membrane; 16. second annular flow channel; 17. gas nozzle; 18. drain outlet; 19. sewage outlet; 20. third annular flow channel; 21. clean water nozzle; 22. lifting mechanism; 23. connecting block; 24. electric heating ring; 25. clamp. DETAILED DESCRIPTION

[0072] The existing technologies for recycling backwash water from activated carbon filters are as follows:

[0073] Patent application CN107445340A discloses an activated carbon filter backwash water recovery device and recovery method, which includes the following structure:

[0074] Flocculant dosing tank

[0075] The flocculant dosing tank in the device is responsible for loading flocculants, which is a key step in pre-treating the backwash water of the activated carbon filter to facilitate the subsequent treatment process.

[0076] Backwash water collection tank

[0077] The pool is the core part of the recovery system, and it has three main interfaces: backwash water inlet, flocculant injection port and collection pool outlet. The backwash water inlet is directly connected to the backwash water drain pipe of the activated carbon filter tank for receiving backwash water; the flocculant injection port is connected to the flocculant injection pool through a pipeline for adding flocculants; the collection pool outlet is connected to the water inlet of the ultrafiltration membrane pool for conveying flocculated water.

[0078] Ultrafiltration membrane pool

[0079] The ultrafiltration membrane pool is equipped with an ultrafiltration membrane assembly, and the top is provided with an ultrafiltration membrane outlet and an ultrafiltration membrane backwash inlet. The ultrafiltration membrane outlet is responsible for conveying the treated clean water to the clean water pool, while the ultrafiltration membrane backwash inlet is connected to the backwash outlet of the clean water pool through a backwash pump to form a cycle.

[0080] Ozone generator

[0081] The ozone generator is responsible for generating ozone and transporting it through pipelines to the ozone aeration disk in the ultrafiltration membrane pool for pre-oxidation treatment of water to improve water quality and reduce membrane pollution.

[0082] clear pool

[0083] The clear water tank is used to store water after ultrafiltration and ozone pre-oxidation treatment, which can be safely reused.

[0084] The activated carbon filter backwash water recovery method is as follows:

[0085] Collecting backwash water

[0086] One minute after the activated carbon filter backwash begins, the backwash water is collected because the initial backwash water contains a large amount of impurities and microorganisms and is not suitable for recycling.

[0087] Microflocculation treatment

[0088] The collected backwash water is subjected to micro-flocculation treatment in the backwash water collection tank by adding flocculants and stirring with a mechanical stirring device to promote the coagulation of suspended matter in the water.

[0089] Sedimentation treatment

[0090] The microflocculated water is allowed to settle to separate the agglomerated particles.

[0091] Ozone pre-oxidation

[0092] The supernatant after precipitation is subjected to ozone pre-oxidation treatment to further remove organic matter and microorganisms in the water.

[0093] Ultrafiltration

[0094] The supernatant after ozone pre-oxidation enters the ultrafiltration membrane assembly for ultrafiltration to remove smaller particles and microorganisms.

[0095] Water reuse

[0096] The effluent after ultrafiltration enters the clean water tank. The water quality meets the reuse standard and can be directly reused or used after further treatment.

[0097] It can be seen that the existing patent still uses the static sedimentation method in the precipitation step, and no ultrafiltration membrane self-cleaning mechanism is provided in the ultrafiltration step, which fails to solve the current problem.

[0098] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0099] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0100] Example 1

[0101] The present invention provides an activated carbon filter backwash water recovery device, comprising: a sedimentation cylinder 1, the cylinder body of the sedimentation cylinder 1 is a hollow cylinder, the bottom of the sedimentation cylinder 1 is a hemispherical body, and a top cover 2 is arranged on the top, a sedimentation chamber is defined inside the sedimentation cylinder 1, a first water inlet 101 is arranged at the bottom of the sedimentation cylinder 1, and a first water outlet 102 is opened on the side of the top cover 2; a support 3 is vertically arranged at the center of the sedimentation chamber and is coaxial with the sedimentation cylinder 1, the lower end of the support 3 is fixed to the bottom of the sedimentation cylinder 1, and the upper end is flush with the upper edge of the sedimentation cylinder 1.

[0102] The auxiliary sedimentation plate 4 is vertically arranged between the pillar 3 and the inner side wall of the sedimentation cylinder 1. The auxiliary sedimentation plate 4 is cylindrical and the radial distance between the auxiliary sedimentation plate 4 and the pillar 3 and the inner side wall of the sedimentation cylinder 1 is the same, which is 15 cm. The upper edge of the auxiliary sedimentation plate 4 is flush with the upper edge of the sedimentation cylinder 1, and the lower edge of the auxiliary sedimentation plate 4 is located above the first water inlet 101 and is spaced a certain distance from the first water inlet 101. The auxiliary sedimentation plate 4 divides the sedimentation chamber into an inner chamber 103 and an outer chamber 104, and the auxiliary sedimentation plate 4 is made of a permanent magnet; backwash water can enter the sedimentation chamber from the first water inlet 101, and when the backwash water flows to the corresponding height of the auxiliary sedimentation plate 4, it is diverted to the inner chamber 103 and the outer chamber 104 and flows upward, and the flocculants in the backwash water can be adsorbed on the front and back sides of the auxiliary sedimentation plate 4. When the backwash water flows to the top of the inner chamber 103 and the outer chamber 104, the flocculants in the backwash water are all settled to the bottom of the sedimentation chamber or adsorbed on the auxiliary sedimentation plate 4, and the backwash water can flow out from the first water outlet 102.

[0103] In this embodiment, a flocculant delivery mechanism is also included. Specifically, the flocculant delivery mechanism includes a first annular flow channel 5 and a flocculant delivery nozzle 6. The first annular flow channel 5 is fixedly connected to the sedimentation cylinder 1 near the first water inlet 101 and is connected to the air supply mechanism. The flocculant delivery nozzle 6 is arranged on the inner side of the first annular flow channel 5 and is connected to the first annular flow channel 5. The flocculant delivery nozzle 6 extends into the sedimentation chamber and is used to deliver flocculants to the sedimentation chamber. Multiple flocculant delivery nozzles 6 are evenly spaced along the circumference. When the backwash water enters the sedimentation chamber, flocculants can be delivered to the sedimentation chamber from multiple directions, so that the flocculants are quickly mixed into the backwash water, the floccules are condensed and continue to flow upward with the backwash water.

[0104] In this embodiment, it also includes: a bottom plate 7, which is made of non-magnetic material. The bottom of the auxiliary sedimentation plate 4 is fixed on the bottom plate 7, and the bottom plate 7 is fixed to the inner wall of the sedimentation cylinder 1 by welding. The upper surface of the bottom plate 7 is flush with the lower surface of the auxiliary sedimentation plate 4. The bottom plate 7 is located above the first water inlet 101 and is spaced a certain distance from the first water inlet 101.

[0105] In this embodiment, it also includes: an inner cleaning ring 8, which is adapted to the cross-sectional shape of the inner chamber 103 and is correspondingly arranged above the inner chamber 103; an outer cleaning ring 9, which is adapted to the cross-sectional shape of the outer chamber 104 and is correspondingly arranged above the outer chamber 104; and a long-axis cylinder 10, which is fixedly connected to the top surfaces of the inner cleaning ring 8 and the outer cleaning ring 9, and is used to drive the inner cleaning ring 8 and the outer cleaning ring 9 to move up and down, and the long-axis cylinder 10 is fixed on the top cover 2. The inner cleaning ring 8 and the outer cleaning ring 9 are both made of flexible materials, the inner cleaning ring 8 can move up and down along the inner chamber 103, and the outer cleaning ring 9 can move up and down along the outer chamber 104. The inner cleaning ring 8 and the outer cleaning ring 9 are connected to the long-axis cylinder 10 through independent connecting rods, and the long-axis cylinder 10 can independently drive the inner cleaning ring 8 and the outer cleaning ring 9 to scrape the front and rear surfaces of the auxiliary precipitation plate 4, and push the floccules magnetically adsorbed on the inner and outer surfaces of the auxiliary precipitation plate 4 downward to the bottom of the precipitation chamber. Moreover, during the cleaning process, the inner cleaning ring 8 and the outer cleaning ring 9 can also clean the outer surface of the support 3 and the inner surface of the sedimentation cylinder 1 simultaneously.

[0106] In the present embodiment, it also includes: an ultrafiltration cartridge 11, the body of the ultrafiltration cartridge 11 is a hollow cylinder, the bottom of which is a hemispherical body, and an ultrafiltration chamber 1101 is defined inside; a water inlet cartridge 12 is arranged in the middle of the ultrafiltration chamber 1101, the upper edge of the water inlet cartridge 12 is flush with the upper edge of the ultrafiltration cartridge 11, the water inlet cartridge 12 has a second water inlet 1201 and a second water outlet 1202, wherein the second water inlet 1201 is located at the upper end of the water inlet cartridge 12, the second water outlet 1202 is located at the lower end of the water inlet cartridge 12, a hemispherical cover 13 is arranged above the second water inlet 1201, the first water outlet 102 is connected to the cover 13 through a fluid pipe 14, backwash water flows into the second water inlet 1201 through the first water outlet 102 and the fluid pipe 14, and the second water outlet 1202 is connected to the ultrafiltration chamber 1101; The ultrafiltration membrane 15 is arranged between the inner wall of the water inlet cylinder 12 and the ultrafiltration cylinder 11 and is arranged near the second water outlet 1202; the bubble flushing mechanism includes a second annular flow channel 16 and a gas nozzle 17, the second annular flow channel 16 is fixedly connected to the ultrafiltration cylinder 11 and communicated with the gas supply mechanism, the gas nozzles 17 are evenly spaced on the inner surface of the second annular flow channel 16 and are arranged near the ultrafiltration membrane 15, and the gas nozzles 17 extend into the ultrafiltration chamber 1101 to blow bubbles to the lower surface of the ultrafiltration membrane 15; the drain port 18 is communicated with the ultrafiltration chamber 1101 and is located above the ultrafiltration membrane 15; the backwash water enters the water inlet cylinder 12 through the first water outlet 102 and the second water inlet 1201, flows downward along the water inlet cylinder 12 and flows into the ultrafiltration chamber 1101 from the second water outlet 1202, passes through the ultrafiltration membrane 15 and is discharged from the drain port 18.

[0107] In this embodiment, the sewage outlet 19 is connected to the ultrafiltration chamber 1101, and the connection point is close to the bottom of the ultrafiltration chamber 1101, which is used to discharge impurities intercepted and precipitated by the ultrafiltration membrane 15. The slag outlet is connected to the bottom of the precipitation chamber, which is used to discharge the precipitated flocs, and the slag outlet is spaced apart from the first water inlet 101.

[0108] In this embodiment, each water inlet, water outlet, slag outlet and sewage outlet 19 is provided with a valve for opening and closing. For example, a sewage outlet valve is provided on the sewage outlet 19 for opening and closing the sewage outlet 19; a drain valve is provided on the drain outlet 18 for opening and closing the drain outlet 18; and a water inlet valve is provided on the first water inlet 101 for opening and closing the first water inlet 101.

[0109] In this embodiment, the interval between the inner side wall of the water inlet cylinder 12 and the ultrafiltration cylinder 11 is 20 cm.

[0110] In the present embodiment, it also includes: a self-cleaning mechanism, specifically, the self-cleaning mechanism includes a third annular flow channel 20 and a clean water nozzle 21, the third annular flow channel 20 is fixedly arranged with the ultrafiltration cartridge 11 and is connected with the water supply mechanism, the clean water nozzle 21 is evenly spaced and arranged on the inner side surface of the third annular flow channel 20, the clean water nozzle 21 extends into the ultrafiltration chamber 1101, and is used for spraying clean water onto the upper surface of the ultrafiltration membrane 15; the self-cleaning mechanism is arranged above the drain outlet 18.

[0111] In this embodiment, it also includes: a lifting mechanism 22 (telescopic motor), the top outer edge of the water inlet cylinder 12 is fixedly connected to the inner wall of the ultrafiltration cylinder 11 through the connecting block 23, the upper edge of the connecting block 23 is flush with the upper edge of the water inlet cylinder 12, and the lifting mechanism 22 is arranged at the bottom of the connecting block 23; the clamp 25 is arranged on the output end of the lifting mechanism 22; the electric heating ring 24 is arranged between the water inlet cylinder 12 and the inner wall of the ultrafiltration cylinder 11 and clamped on the clamp 25, the lifting mechanism 22 is used to drive the electric heating ring 24 to approach or move away from the ultrafiltration membrane 15, when the electric heating ring 24 is close to the ultrafiltration membrane 15, the electric heating ring 24 can heat the ultrafiltration membrane 15, it should be noted that the electric heating ring 24 adopts electric heating method, and a power supply can be provided on the inner wall of the ultrafiltration cylinder 11, or the connecting wire of the electric heating ring 24 can be led out from the ultrafiltration cylinder 11 to connect with an external power supply.

[0112] In this embodiment, the clamp 25 is a U-shaped ring, and there are two lifting mechanisms 22 arranged on both sides of the water inlet cylinder 12. The top of the U-shaped ring is connected to the lifting mechanism 22, and the electric heating ring 24 is welded in the through groove of the U-shaped ring. The two lifting mechanisms 22 rise and fall synchronously, driving the electric heating ring 24 to approach or move away from the ultrafiltration membrane 15.

[0113] The present invention also provides an activated carbon filter backwash water recovery method, using an activated carbon filter backwash water recovery device, comprising the following steps:

[0114] S1: After the initial filtration, the backwash water enters the sedimentation chamber from the first water inlet 101. The flocculant delivery mechanism delivers flocculant into the sedimentation chamber. The flocculant and the backwash water are mixed to form flocs. The backwash water is divided into the inner chamber 103 and the outer chamber 104, and flows from bottom to top along the height direction of the auxiliary sedimentation plate 4. After 10 minutes, the backwash water flows from the first water inlet 101 to the first water outlet 102 (this time can be controlled by controlling the flow rate of the backwash water entering the first water inlet 101). The flocs are all adsorbed on the front and rear sides of the auxiliary sedimentation plate 4 or settled to the bottom of the sedimentation chamber.

[0115] S2: The backwash water enters the water inlet cylinder 12 from the first water outlet 102, the fluid pipeline 14, and the second water inlet 1201 and flows downward, and enters the ultrafiltration chamber 1101 from the second water outlet 1202; the backwash water passes through the ultrafiltration membrane 15 from bottom to top to intercept the impurities and settle them to the bottom of the ultrafiltration chamber 1101, and the backwash water is discharged from the drain port 18;

[0116] S3: The bubble flushing mechanism blows bubbles to the lower surface of the ultrafiltration membrane 15, so that the impurities trapped on the lower surface of the ultrafiltration membrane 15 are separated from the ultrafiltration membrane 15 and settled to the bottom of the ultrafiltration chamber 1101;

[0117] S4: When sticky impurities adhere to the lower surface of the ultrafiltration membrane 15, the lifting mechanism 22 moves the electric heating ring 24 to a position close to the upper surface of the ultrafiltration membrane 15 through the clamp 25, and heats the ultrafiltration membrane 15 through the electric heating ring 24 to reduce the viscosity of the sticky impurities; close the drain valve, close the drain port 18, open the sewage valve to connect the sewage port 19 with the ultrafiltration chamber 1101, and the self-cleaning mechanism sprays clean water on the upper surface of the ultrafiltration membrane 15. The clean water passes through the ultrafiltration membrane 15 from top to bottom to separate the sticky impurities from the ultrafiltration membrane 15 and settle them to the bottom of the ultrafiltration chamber 1101 (the water inlet valve at the first water inlet 101 can also be closed).

[0118] S5: When a large amount of flocs accumulate at the bottom of the sedimentation chamber, open the slag discharge valve to discharge the flocs from the slag discharge port; when a large amount of impurities accumulate at the bottom of the ultrafiltration chamber 1101, open the sewage discharge port 19 to discharge the impurities from the sewage discharge port 19.

[0119] Example 2

[0120] The difference between this embodiment and embodiment 1 is that the distances between the auxiliary sedimentation plate 4 and the inner wall of the support 3 and the sedimentation cylinder 1 are the same, which is 10 cm. After 15 minutes, the backwash water flows from the first water inlet 101 to the first water outlet 102 .

[0121] Example 3

[0122] The difference between this embodiment and embodiment 1 is that the interval between the inner side wall of the water inlet cylinder 12 and the ultrafiltration cylinder 11 is 15 cm.

[0123] The turbidity of the backwash water discharged from the first water outlet 102 in Examples 1 to 3 was tested, and the stratification of the sedimentation chamber was observed. The results showed that there were clear sediments at the bottom of the sedimentation chamber, obvious floccules were adsorbed on the front and rear sides of the auxiliary sedimentation plate, and the upper water body of the sedimentation chamber was clear. The turbidity of the backwash water discharged from the first water outlet 102 was significantly reduced.

[0124] The backwash water (which has the same source as the backwash water in Examples 1 to 3, i.e., backwash water from a certain activated carbon filter) was precipitated in a traditional sedimentation tank for 2 hours, and the turbidity of the outlet of the sedimentation tank was tested. The results showed that the turbidity was significantly reduced. Compared with the turbidity of the backwash water at the first outlet 102 in Examples 1 to 3, the turbidity difference was no more than 2%, which indicates that the embodiments of the present application can achieve continuous precipitation of backwash water.

[0125] The turbidity test data are as follows:

[0126] Example 1 Example 2 Example 3 Sedimentation tank Turbidity after precipitation 5.8NTU 5.76NTU 5.8NTU 5.78NTU

[0127] The ultrafiltration membrane 15 in Examples 1 to 3 was sampled and tested, and the results showed that there were no obvious impurities remaining on the upper and lower surfaces of the ultrafiltration membrane 15 after bubble flushing, heating by the electric heating ring 24 and backwashing by the self-cleaning mechanism, which indicates that the embodiments of the present application can achieve the self-cleaning function of the ultrafiltration membrane 15 and avoid clogging of the ultrafiltration membrane 15.

[0128] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0129] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An activated carbon filter backwash water recovery device, characterized in that: include: A sedimentation cylinder (1) defines a sedimentation chamber therein; A support (3) is vertically arranged in the middle of the precipitation chamber; An auxiliary sedimentation plate (4) is vertically arranged between the support (3) and the inner side wall of the sedimentation cylinder (1), and divides the sedimentation chamber into an inner chamber (103) and an outer chamber (104); the auxiliary sedimentation plate (4) is made of a permanent magnet; the sedimentation cylinder (1) has a first water inlet (101) and a first water outlet (102) connected to the sedimentation chamber; backwash water can enter the inner chamber (103) and the outer chamber (104) from the first water inlet (101) and flow upward; floccules in the backwash water can be adsorbed on the front and rear sides of the auxiliary sedimentation plate (4); when the backwash water flows to the top of the inner chamber (103) and the outer chamber (104), the backwash water does not contain floccules and can flow out from the first water outlet (102).

2. The activated carbon filter backwash water recovery equipment according to claim 1, characterized in that: Also includes: Flocculants A delivery mechanism, arranged near the first water inlet (101) and used for delivering flocculant into the sedimentation chamber; The inner side walls of the support (3) and the sedimentation cylinder (1) are 10-15 cm away from the auxiliary sedimentation plate (4).

3. The activated carbon filter backwash water recovery equipment according to claim 2, characterized in that: Also includes: A bottom plate (7), the auxiliary sedimentation plate (4) being arranged on the bottom plate (7), the bottom plate (7) being located above the first water inlet (101) and being fixedly connected to the inner wall of the sedimentation cylinder (1).

4. The activated carbon filter backwash water recovery equipment according to claim 3, characterized in that: Also includes: An inner cleaning ring (8) adapted to the cross-sectional shape of the inner chamber (103) and correspondingly arranged above the inner chamber (103); An outer cleaning ring (9) adapted to the cross-sectional shape of the outer chamber (104) and correspondingly arranged above the outer chamber (104); The long-axis cylinder (10) is fixedly connected to the top surfaces of the inner cleaning ring (8) and the outer cleaning ring (9), and is used to drive the inner cleaning ring (8) and the outer cleaning ring (9) to move up and down.

5. The activated carbon filter backwash water recovery equipment according to claim 4, characterized in that: Also includes: An ultrafiltration cartridge (11) defines an ultrafiltration chamber (1101) therein; a water inlet cylinder (12), arranged in the middle of the ultrafiltration chamber (1101), the water inlet cylinder (12) having a second water inlet (1201) and a second water outlet (1202), the second water inlet (1201) being in communication with the first water outlet (102), and the second water outlet (1202) being in communication with the ultrafiltration chamber (1101); An ultrafiltration membrane (15) is arranged between the water inlet cylinder (12) and the inner side wall of the ultrafiltration cylinder (11); A bubble flushing mechanism, connected to the air supply mechanism and used for blowing bubbles toward the lower surface of the ultrafiltration membrane (15); A water outlet (18) is connected to the ultrafiltration chamber (1101) and is located above the ultrafiltration membrane (15); the backwash water enters the water inlet cylinder (12) through the first water outlet (102) and the second water inlet (1201), flows downward along the water inlet cylinder (12) and flows into the ultrafiltration chamber (1101) from the second water outlet (1202), passes through the ultrafiltration membrane (15), and is discharged from the water outlet (18); The sewage outlet (19) is connected to the ultrafiltration chamber (1101), and the connection point is close to the bottom of the ultrafiltration chamber (1101).

6. The activated carbon filter backwash water recovery equipment according to claim 5, characterized in that: The water inlet cylinder (12) and the inner side wall of the ultrafiltration cylinder (11) are spaced 15-20 cm apart.

7. The activated carbon filter backwash water recovery equipment according to claim 5, characterized in that: Also includes: A self-cleaning mechanism, connected to the water supply mechanism, for spraying clean water onto the upper surface of the ultrafiltration membrane (15); A sewage valve, arranged on the sewage outlet (19) and used for opening and closing the sewage outlet (19); A drain valve is arranged on the drain outlet (18) and is used for opening and closing the drain outlet (18).

8. The activated carbon filter backwash water recovery equipment according to claim 7, characterized in that: Also includes: A lifting mechanism (22), wherein the top outer edge of the water inlet cylinder (12) is fixedly connected to the inner side wall of the ultrafiltration cylinder (11) via a connecting block (23), and the lifting mechanism (22) is arranged at the bottom of the connecting block (23); A clamp (25) is arranged on the lifting mechanism (22); The electric heating ring (24) is arranged between the inner side walls of the water inlet cylinder (12) and the ultrafiltration cylinder (11) and clamped on the clamp (25). The lifting mechanism (22) is used to drive the electric heating ring (24) to approach or move away from the ultrafiltration membrane (15). When the electric heating ring (24) is close to the ultrafiltration membrane (15), the electric heating ring (24) can heat the ultrafiltration membrane (15).

9. The activated carbon filter backwash water recovery equipment according to claim 8, characterized in that: The clamp (25) is a U-shaped ring, the lifting mechanisms (22) have at least two and are arranged on both sides of the water inlet cylinder (12), the top of the U-shaped ring is connected to the lifting mechanism (22), and the electric heating ring (24) is welded in the through groove of the U-shaped ring.

10. A method for recovering backwash water from an activated carbon filter, characterized in that: The activated carbon filter backwash water recovery device according to claim 9 comprises the following steps: S1: backwash water enters the sedimentation chamber from the first water inlet (101), and the flocculant delivery mechanism delivers flocculant into the sedimentation chamber. The flocculant and the backwash water are mixed to form flocs. The backwash water is divided into an inner chamber (103) and an outer chamber (104), and flows from bottom to top along the height direction of the auxiliary sedimentation plate (4). After 10-15 minutes, the backwash water flows from the first water inlet (101) to the first water outlet (102), and the flocs are all adsorbed on the front and rear sides of the auxiliary sedimentation plate (4) or settle to the bottom of the sedimentation chamber; S2: backwash water enters the water inlet cylinder (12) from the first water outlet (102) and the second water inlet (1201) and flows downward, and enters the ultrafiltration chamber (1101) from the second water outlet (1202); the backwash water passes through the ultrafiltration membrane (15) from bottom to top, intercepts impurities and settles them to the bottom of the ultrafiltration chamber (1101), and the backwash water is discharged from the drain outlet (18); S3: the bubble flushing mechanism blows bubbles toward the lower surface of the ultrafiltration membrane (15), so that impurities trapped on the lower surface of the ultrafiltration membrane (15) are separated from the ultrafiltration membrane (15) and settle to the bottom of the ultrafiltration chamber (1101); S4: When sticky impurities adhere to the lower surface of the ultrafiltration membrane (15), the lifting mechanism (22) moves the electric heating ring (24) to a position close to the upper surface of the ultrafiltration membrane (15) through the clamp (25), and heats the ultrafiltration membrane (15) through the electric heating ring (24) to reduce the viscosity of the sticky impurities; the drain valve is closed, the drain port (18) is closed, and the sewage valve is opened to connect the sewage port (19) with the ultrafiltration chamber (1101), and the self-cleaning mechanism sprays clean water on the upper surface of the ultrafiltration membrane (15). The clean water passes through the ultrafiltration membrane (15) from top to bottom to separate the sticky impurities from the ultrafiltration membrane (15) and settle to the bottom of the ultrafiltration chamber (1101).

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