Backwash water recycling device

Abstract

The utility model relates to the technical field of water treatment, in particular to a backwashing water recycling device which comprises a raw water tank, one side of the raw water tank is communicated with a water purifying device, one side of the water purifying device is communicated with a water purifying tank, one side of the water purifying tank is provided with a filter assembly, one side of the filter assembly is communicated with an ultrafiltration water tank, and one side of the ultrafiltration water tank is communicated with a reverse osmosis unit. One side of the reverse osmosis unit is communicated with the ultrafiltration water tank through a return pipe, the other side of the reverse osmosis unit is communicated with the reuse water regulating reservoir, one side of the reuse water regulating reservoir is communicated with the reuse water device, the reverse osmosis water output end of the reverse osmosis unit is communicated with one side of the mixed bed, and the other side of the mixed bed is communicated with the desalted water tank; the backwashing water tank is communicated with the raw water tank through a backwashing water recovery pump; most of backwashing water of a cellulose filter, an ultrafiltration filter and a self-cleaning filter and conventional washing water of a mixed bed with water quality indexes superior to that of raw water entering a plant are collected into a backwashing water tank and then are sent to a water purification device, so that the use amount of the raw water is reduced, and the reuse treatment load and cost of reclaimed water are reduced.

Description

Technical Field

[0001] This utility model relates to the field of water treatment technology, specifically to a device for backwash water recycling. Background Technology

[0002] Backwash water refers to the wastewater generated during water treatment by flushing filters, membrane modules, or other water treatment equipment with reverse water flow to remove impurities and contaminants.

[0003] In existing technologies, modern industrial production typically employs a combination of processes, including high-efficiency sedimentation tanks, V-type filters, fiber filters, ultrafiltration, reverse osmosis, and mixed beds, to ensure water purity in water purification and desalination plants. During the backwashing processes of components such as fiber filters, ultrafiltration units, primary reverse osmosis equipment, and mixed beds, a large amount of backwash water is generated. Currently, this backwash water is directly discharged into drainage ditches and subsequently sent to a reclaimed water treatment system for further treatment.

[0004] However, existing backwash water recycling devices have many shortcomings. On the one hand, traditional methods have limited effectiveness in removing contaminants from backwash water, making it difficult to meet the standards for direct reuse. Therefore, additional deep treatment is still required, increasing complexity and cost. On the other hand, the design of existing equipment focuses on optimizing individual process steps, lacking a holistic solution and failing to effectively integrate the backwash water recycling process across various process steps, resulting in resource waste and low processing efficiency. Furthermore, due to the significant differences in backwash water quality generated by different process steps, existing equipment cannot flexibly adapt to various water quality conditions, thus limiting its widespread application and promotion. Therefore, this utility model proposes a backwash water recycling device to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a device for recycling backwash water, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a device for backwash water recycling, comprising: a raw water tank, characterized in that: one side of the raw water tank is connected to a water purification device, one side of the water purification device is connected to a purified water tank, one side of the purified water tank is provided with a filter assembly, and one side of the filter assembly is connected to an ultrafiltration water tank.

[0007] One side of the ultrafiltration water tank is connected to the reverse osmosis unit, and one side of the reverse osmosis unit is connected to the ultrafiltration water tank through a return pipe. The other side of the reverse osmosis unit is connected to the reclaimed water conditioning tank through a large pump and pipeline. One side of the reclaimed water conditioning tank is connected to the reclaimed water device through a large pump and pipeline. The reverse osmosis water output end of the reverse osmosis unit is connected to one side of the mixed bed, and the other side of the mixed bed is connected to the demineralized water tank.

[0008] The filter assembly and the bottom of the mixed bed are connected to the backwash water tank via a recycling water pipe, and the backwash water tank is connected to the raw water tank via a backwash water recycling pump.

[0009] Preferably, one side of the water purification device is connected to the raw water tank through a first pump body and pipeline, and the other side of the water purification device is connected to one side of the purified water tank through the first pump body and pipeline.

[0010] Preferably, the filter assembly includes a cellulose filter, a self-cleaning filter, and an ultrafiltration unit, which are connected in sequence away from the ultrafiltration water tank. The other side of the purified water tank is connected to the cellulose filter side through a second pump body and pipeline.

[0011] Preferably, the other side of the cellulose filter is connected to the self-cleaning filter via a third pump and pipeline, the other side of the self-cleaning filter is connected to the ultrafiltration unit via a third pump and pipeline, and the other side of the ultrafiltration unit is connected to the top of the ultrafiltration water tank via a small pump and pipeline.

[0012] Preferably, the bottom of the ultrafiltration water tank is connected to the input end of the reverse osmosis unit via an RO booster pump, and the bottoms of the cellulose filter, self-cleaning filter, and ultrafiltration unit are all connected to the recovery water pipe.

[0013] Preferably, the recovery water pipe is connected to the backwash water tank via a pump and pipeline, and both the backwash water recovery pump and the pump are fixedly installed on one side of the backwash water tank.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. The backwash water recycling device of this utility model collects the backwash water from cellulose filters, ultrafiltration filters, self-cleaning filters and mixed bed forward wash water, which have water quality indicators that are better than the raw water entering the plant, into the backwash water tank and then sends it to the water purification device. This reduces the amount of raw water used and lowers the load and cost of reclaimed water treatment.

[0016] 2. The backwash water recycling device of this utility model divides the secondary reverse osmosis concentrate into two recirculation streams. One stream is returned to the secondary reverse osmosis membrane. This recirculation can increase the surface flow rate of the secondary reverse osmosis membrane, reduce concentration polarization, and improve the quality of the effluent. In addition, since this concentrate has a high pH value, while the primary reverse osmosis effluent has a low pH value due to the inability to remove CO2 gas, this recirculation of concentrate can save on the addition of alkali to the secondary reverse osmosis feed water, thereby saving alkali addition costs. The remaining concentrate is returned to the ultrafiltration water tank. This recirculation, after mixing, can reduce the salt content of the primary reverse osmosis feed water. In addition, since the amount of concentrate returned to the ultrafiltration water tank is reduced, the impact of increased pH value on the system can be avoided. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a side view of the overall structure of this utility model;

[0019] Figure 3 This is a top view of the overall structure of this utility model;

[0020] Figure 4 This is a bottom view of the overall structure of this utility model.

[0021] In the diagram: 1. Raw water tank; 2. Water purification device; 3. Purified water tank; 4. Ultrafiltration water tank; 5. Reverse osmosis unit; 6. Return pipe; 7. Reclaimed water equalization tank; 8. Mixed bed; 9. Demineralized water tank; 10. Recycled water pipe; 11. Backwash water tank; 12. Backwash water recovery pump; 13. First pump body; 14. Cellulose filter; 15. Self-cleaning filter; 16. Ultrafiltration unit; 17. Second pump body; 18. Third pump body; 19. Small pump body; 20. RO booster pump; 21. Large pump body; 22. Liquid pump; 23. Reclaimed water device. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clear and complete, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of this utility model, and are merely used to explain the embodiments of this utility model. They are not intended to limit the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] Please see Figures 1 to 4This utility model provides a technical solution: a device for backwash water recycling, comprising: a raw water tank 1 for storing raw water, one side of which is connected to a water purification device 2, which removes most of the colloids and suspended solids. In the pretreatment stage, coagulants are added to form larger flocs, and a high-efficiency sedimentation tank is used to accelerate sedimentation, initially removing suspended solids and colloids. Next, in the filtration stage, a V-type filter and a fiber filter further perform deep filtration, capturing tiny particles and colloids. Subsequently, membrane separation technologies such as ultrafiltration (UF) and reverse osmosis (RO) further retain colloids and other impurities, ensuring stable and clear water quality. Finally, auxiliary measures such as activated carbon adsorption and air flotation further remove trace pollutants and organic colloids. One side of the water purification device 2 is connected to the water purification tank 3, where purified water is stored. A filter assembly is installed on one side of the water purification tank 3 to further reduce suspended solids, bacteria, turbidity, and organic pollutants. One side of the filter assembly is connected to the ultrafiltration water tank 4, which stores the water after secondary purification. One side of the ultrafiltration water tank 4 is connected to the reverse osmosis unit 5, which further effectively removes dissolved salts, colloids, bacteria, viruses, and most organic matter from the water. One side of the reverse osmosis unit 5 is connected to the ultrafiltration water tank 4 via a return pipe 6, which is used for secondary reverse osmosis. A portion of the permeate concentrate is recycled. The other side of the reverse osmosis unit 5 is connected to the recycled water equalization tank 7 via a large pump body 21 and pipeline. One side of the recycled water equalization tank 7 is connected to the recycled water device 23 via a large pump body 21 and pipeline. The reverse osmosis water output end of the reverse osmosis unit 5 is connected to one side of the mixed bed 8. The mixed bed 8 removes dissolved salts. The other side of the mixed bed 8 is connected to the demineralized water tank 9. The filter assembly and the bottom of the mixed bed 8 are connected to the backwash water tank 11 via a recovery water pipe 10. The recovery water pipe 10 is used for washing liquid recovery. The backwash water tank 11 is connected to the raw water tank 1 via a backwash water recovery pump 12. The backwash water tank 11 and the raw water tank 1 are connected by the backwash water recovery pump 12, thus forming a complete water treatment cycle system.

[0024] One side of the water purification device 2 is connected to the raw water tank 1 via the first pump body 13 and a pipeline, and the other side of the water purification device 2 is connected to one side of the purified water tank 3 via the first pump body 13 and a pipeline. Both sides of the water purification device 2 are connected to the raw water tank 1 and the purified water tank 3 respectively via the first pump body 13 and a pipeline. The filter assembly includes a cellulose filter 14, a self-cleaning filter 15, and an ultrafiltration unit 16, which are connected sequentially away from the ultrafiltration water tank 4. Backwash water passes sequentially through the cellulose filter 14, the self-cleaning filter 15, and the ultrafiltration unit 16, gradually removing impurities. To remove suspended solids, colloids, and large molecular organic matter, the system ensures water clarity and provides high-quality influent for subsequent treatment. The other side of the water purification tank 3 is connected to one side of the cellulose filter 14 via the second pump body 17 and pipeline. The other side of the cellulose filter 14 is connected to one side of the self-cleaning filter 15 via the third pump body 18 and pipeline. The other side of the self-cleaning filter 15 is connected to one side of the ultrafiltration unit 16 via the third pump body 18 and pipeline. The other side of the ultrafiltration unit 16 is connected to the top of the ultrafiltration water tank 4 via the small pump body 19 and pipeline.

[0025] The bottom of the ultrafiltration water tank 4 is connected to the input end of the reverse osmosis unit 5 via the RO booster pump 20. The main function of the RO booster pump 20 is to pressurize the water treated by the ultrafiltration unit 16 to a sufficient pressure to enter the reverse osmosis unit 5. Since the reverse osmosis process needs to overcome the osmotic pressure of the water and force the water to pass through the semi-permeable membrane, a high inlet water pressure is required. The bottoms of the cellulose filter 14, the self-cleaning filter 15, and the ultrafiltration unit 16 are all connected to the recovery water pipe 10, through which the backwash water discharged from the cellulose filter 14, the self-cleaning filter 15, and the ultrafiltration unit 16 is recovered.

[0026] In operation, raw water first enters the raw water tank 1, then is pumped into the water purification device 2 via the first pump 13. Here, most colloids and suspended solids are removed. The purified water is then pumped into the water purification tank 3 via the first pump 13, and then transported to the cellulose filter 14 for further treatment by the second pump 17. The backwash water from the cellulose filter 14 is discharged into the recovery water pipe 10. The water treated by the cellulose filter 14 then passes through the self-cleaning filter 15 and enters the ultrafiltration unit 16. The ultrafiltration unit 16 further reduces suspended solids, bacteria, turbidity, and organic pollutants in the water, while the backwash water from the self-cleaning filter 15 and the ultrafiltration unit 16 is also discharged into the recovery water pipe 10. The effluent from the ultrafiltration unit 16 enters the ultrafiltration water tank 4 via the small pump 19, and is then sent to the reverse osmosis unit 5 for deep treatment via the RO booster pump 20. During the reverse osmosis process, part of the secondary reverse osmosis concentrate is returned to the ultrafiltration water tank 4 via the return pipe 6, and the other part is returned to the secondary reverse osmosis membrane. The primary reverse osmosis concentrate is sent to the reclaimed water equalization tank 7. Reverse osmosis effectively removes dissolved salts, colloids, bacteria, viruses, and most organic matter from the water. The water in the reclaimed water equalization tank 7 is sent to the reclaimed water device 23 for further treatment, while the reverse osmosis effluent continues to enter the mixed bed 8 for further removal of dissolved salts. Finally, the effluent from the mixed bed 8 enters the demineralized water tank 9, while the forward wash water from the mixed bed 8 is discharged into the recovery water pipe 10. All the water flows in the recovery water pipe 10 converge and flow into the backwash water tank 11 via the liquid pump 22, and are then pumped back to the raw water tank 1 via the backwash water recovery pump 12, forming a complete water treatment cycle system.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for backwash water recycling, comprising a raw water tank (1), characterized in that: The raw water tank (1) is connected to the water purification device (2) on one side, the water purification device (2) is connected to the water purification tank (3) on one side, the water purification tank (3) is equipped with a filter assembly on one side, and the filter assembly is connected to the ultrafiltration water tank (4) on one side. One side of the ultrafiltration water tank (4) is connected to the reverse osmosis unit (5), and one side of the reverse osmosis unit (5) is connected to the ultrafiltration water tank (4) through the return pipe (6). The other side of the reverse osmosis unit (5) is connected to the recycled water conditioning tank (7) through the large pump body (21) and pipeline. One side of the recycled water conditioning tank (7) is connected to the recycled water device (23) through the large pump body (21) and pipeline. The reverse osmosis water output end of the reverse osmosis unit (5) is connected to one side of the mixed bed (8), and the other side of the mixed bed (8) is connected to the demineralized water tank (9). The filter assembly and the bottom of the mixed bed (8) are connected to the backwash water tank (11) through the recovery water pipe (10), and the backwash water tank (11) is connected to the raw water tank (1) through the backwash water recovery pump (12).

2. The device for backwash water recycling according to claim 1, characterized in that: The water purification device (2) is connected to the raw water tank (1) on one side through the first pump body (13) and pipeline, and the water purification device (2) is connected to the purified water tank (3) on the other side through the first pump body (13) and pipeline.

3. The device for backwash water recycling according to claim 1, characterized in that: The filter assembly includes a cellulose filter (14), a self-cleaning filter (15), and an ultrafiltration unit (16) connected in sequence away from the ultrafiltration water tank (4). The other side of the purified water tank (3) is connected to one side of the cellulose filter (14) through a second pump body (17) and a pipeline.

4. The device for backwash water recycling according to claim 3, characterized in that: The other side of the cellulose filter (14) is connected to the self-cleaning filter (15) via the third pump body (18) and pipeline. The other side of the self-cleaning filter (15) is connected to the ultrafiltration unit (16) via the third pump body (18) and pipeline. The other side of the ultrafiltration unit (16) is connected to the top of the ultrafiltration water tank (4) via the small pump body (19) and pipeline.

5. The device for backwash water recycling according to claim 4, characterized in that: The bottom of the ultrafiltration water tank (4) is connected to the input end of the reverse osmosis unit (5) via the RO booster pump (20), and the bottoms of the cellulose filter (14), self-cleaning filter (15), and ultrafiltration unit (16) are all connected to the recovery water pipe (10).

6. The device for backwash water recycling according to claim 1, characterized in that: The recovery water pipe (10) is connected to the backwash water tank (11) through a pump (22) and a pipeline. The backwash water recovery pump (12) and the pump (22) are both fixedly installed on one side of the backwash water tank (11).

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