A backwash water concentrate recycling device

Abstract

This utility model discloses a backwash water concentrate recovery and utilization device, belonging to the field of water treatment technology. It includes a first filtration device, a second filtration device, and a third filtration device. The first, second, and third filtration devices are connected to the inlet of a wastewater collection tank. The outlet of the wastewater collection tank is connected to a wastewater pipe, which is connected to the inlet of a wastewater pump. The outlet of the wastewater pump is connected to a greywater treatment mechanism and also to a water purification mechanism. This utility model, employing the aforementioned backwash water concentrate recovery and utilization device, reduces the operating load and cost of the greywater treatment system, optimizes the water quality balance of the circulating water system, and prevents corrosion or scaling of cooling equipment, thereby ensuring the efficient and stable operation of the water treatment system.

Description

Technical Field

[0001] This utility model belongs to the field of water treatment technology, specifically relating to a backwash water concentrate recovery and utilization device. Background Technology

[0002] In the demineralized water preparation process of synthetic ammonia plants, valveless filters, ultrafiltration units, and reverse osmosis units are generally installed. These devices prepare primary water into demineralized water that meets production requirements. During the demineralized water preparation process, the filter media of the valveless filters needs to be backwashed every ten hours or so; at the same time, the ultrafiltration membrane of the ultrafiltration unit also needs to be backwashed regularly to ensure the stable operation of the valveless filters and ultrafiltration units. After ultrafiltration pretreatment, qualified water enters the reverse osmosis unit, where the reverse osmosis membrane removes most of the soluble salts, colloids, organic matter, and microorganisms from the water. Water molecules and a very small amount of low molecular weight organic matter pass through the reverse osmosis membrane layer, becoming demineralized water that is transported to various water usage points; conversely, water that cannot pass through becomes concentrated water and is discharged from the system.

[0003] In traditional processes, to avoid water waste, the backwash water generated during the backwashing of valveless filters and ultrafiltration units, as well as the concentrated water from reverse osmosis units, is generally discharged into a wastewater collection tank and then pumped to a greywater treatment plant for further treatment, becoming recycled water used as makeup water for the circulating water system. However, this method increases the load and operating costs of the greywater treatment plant. Furthermore, because recycled water has very low calcium hardness and alkalinity, its addition to the circulating water system results in low calcium hardness and alkalinity, causing the circulating water to become corrosive. Long-term use of this water can lead to corrosion and leaks in the circulating water system and the heat exchange equipment using the circulating water, affecting the stable operation of the entire system. Therefore, a new device is urgently needed. Summary of the Invention

[0004] The purpose of this invention is to provide a backwash water concentrate recycling device, which significantly reduces the operating load and cost of the greywater system, optimizes the water quality balance of the circulating water system, prevents corrosion or scaling of cooling equipment, and thus ensures the efficient and stable operation of the entire water treatment system.

[0005] To achieve the above objectives, this utility model provides a backwash water concentrate recycling device, including a first filtration device, a second filtration device, and a third filtration device. The first filtration device, the second filtration device, and the third filtration device are respectively connected to the inlet end of a wastewater collection tank. The outlet end of the wastewater collection tank is connected to a wastewater pipe. The wastewater pipe is connected to the inlet end of a wastewater pump. The outlet end of the wastewater pump is connected to a greywater treatment mechanism. The outlet end of the wastewater pump is also connected to a water purification mechanism.

[0006] Preferably, the first filtration device includes a valveless filter tank, the outlet end of which is connected to a first backwash water pipe, and the first backwash water pipe is connected to the inlet end of the wastewater collection tank.

[0007] Preferably, the second filtration device includes an ultrafiltration device, the outlet of which is connected to a second backwash water pipe, and the second backwash water pipe is connected to the inlet of the wastewater collection tank.

[0008] Preferably, the third filtration device includes a reverse osmosis device, the outlet of which is connected to a concentrate discharge pipe, and the concentrate discharge pipe is connected to the inlet of the wastewater collection tank.

[0009] Preferably, the greywater treatment device includes a greywater inlet pipe, one end of which is connected to the wastewater pump, the other end of which is connected to a greywater device, the greywater device is connected to a greywater outlet pipe, and the greywater outlet pipe is connected to a circulating water device.

[0010] Preferably, the water purification mechanism includes a wastewater pump outlet pipe, one end of which is connected to a wastewater pump, and the other end of which is connected to an integrated water purifier, which is connected to a clean water pump outlet pipe.

[0011] Preferably, a first valve is installed on the concentrated water discharge pipe, a second valve is installed on the concentrated water reuse pipe, a third valve is installed on the reclaimed water inlet pipe, a fourth valve is installed on the wastewater pump outlet pipe, and a fifth valve is installed on the reclaimed water outlet pipe.

[0012] Preferably, the reverse osmosis device is also connected to a concentrate reuse pipe, which is connected to the greywater outlet pipe, with the connection point located after the output end of the fifth valve.

[0013] Preferably, the outlet end of the ultrafiltration device is also connected to a filter tube, and the other end of the filter tube is connected to the reverse osmosis device.

[0014] Therefore, the present invention employs the aforementioned backwash water concentrate recovery and utilization device, which, compared with the prior art, has the following significant advantages:

[0015] (1) This utility model improves water resource utilization and reduces operating costs;

[0016] (2) This utility model effectively solves the water quality imbalance problem caused by traditional greywater replenishment by using a concentrated water direct replenishment circulating water system;

[0017] (3) The present invention can flexibly adjust the water quality of the circulating water device to keep the circulating water quality in a balanced state and ensure the safety and stability of each cooling device using the circulating water.

[0018] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the process for a backwash water concentrate recycling device according to the present invention.

[0020] Figure Labels

[0021] 1. Valveless filter tank; 2. Ultrafiltration unit; 3. Reverse osmosis unit; 4. Wastewater collection tank; 5. Wastewater pump; 6. Reclaimed water system; 7. Circulating water system; 8. Integrated water purifier; 9. Clean water pump; 10. First backwash water pipe; 11. Second backwash water pipe; 12. Concentrate discharge pipe; 13. Wastewater pipe; 14. Reclaimed water inlet pipe; 15. Reclaimed water outlet pipe; 16. Concentrate reuse pipe; 17. Wastewater pump outlet pipe; 18. Clean water pump inlet pipe; 19. Clean water pump outlet pipe; 20. First valve; 21. Second valve; 22. Third valve; 23. Fourth valve; 24. Fifth valve; 25. Filter pipe. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of 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. Unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by those skilled in the art.

[0023] Example 1

[0024] like Figure 1 As shown, this utility model discloses a backwash water concentrate recovery and utilization device, including a valveless filter 1. The outlet end of the valveless filter 1 is connected to a first backwash water pipe 10. During the preparation of desalinated water, suspended solids, colloids, and other impurities in the water adhere to the filter media of the valveless filter 1. To prevent impurities from affecting the operation of the valveless filter 1, the filter media of the valveless filter 1 is backwashed every ten hours or so to wash away the impurities. The backwash water containing suspended solids, colloids, and other impurities generated during the backwashing process enters the wastewater collection tank 4 through the first backwash water pipe 10. By regularly backwashing the valveless filter 1, the cleanliness of the filter media and efficient operation are maintained.

[0025] The outlet of ultrafiltration unit 2 is connected to the second backwash water pipe 11. Ultrafiltration achieves its purpose of retaining small particles, reducing suspended solids, bacteria, and turbidity, and partially removing organic pollutants through the mechanical sieving effect of the pore size of the ultrafiltration membrane, the membrane pore blockage effect, and the adsorption of impurities by the membrane surface and pores. During the operation of ultrafiltration unit 2, impurities will also adhere to the ultrafiltration membrane, affecting the operating effect of ultrafiltration unit 2, so the ultrafiltration membrane also needs to be backwashed regularly. The backwash water containing impurities generated during the backwashing process enters the wastewater collection tank 4 through the second backwash water pipe 11. The outlet of ultrafiltration unit 2 is also connected to filter pipe 25, and the other end of filter pipe 25 is connected to reverse osmosis unit 3.

[0026] The outlet of the reverse osmosis unit 3 is connected to the concentrate discharge pipe 12 and the concentrate reuse pipe 16. After pretreatment by the ultrafiltration unit 2, qualified water enters the reverse osmosis unit 3 through the filter pipe 25. The reverse osmosis membrane removes most of the soluble salts, colloids, organic matter, and microorganisms from the water. Water molecules and a very small amount of low molecular weight organic matter pass through the reverse osmosis membrane layer and become desalinated water, which is then transported to various water usage points. Conversely, water that cannot pass through becomes concentrate with very high calcium hardness and total alkalinity. The concentrate is discharged to the wastewater collection tank 4 through the concentrate discharge pipe 12, or connected to the greywater outlet pipe 15 through the concentrate reuse pipe 16 for use as makeup water for the circulating water system.

[0027] The inlet of the wastewater collection tank 4 is connected to the first backwash water pipe 10, the second backwash water pipe 11, and the concentrated water discharge pipe 12. A first valve 20 is installed on the concentrated water discharge pipe 12, and a second valve 21 is installed on the concentrated water reuse pipe 16. The outlet of the wastewater collection tank 4 is connected to the wastewater pipe 13. The backwash water from the valveless filter 1, the backwash water from the ultrafiltration device 2, and the concentrated water from the reverse osmosis device 3 are discharged into the wastewater collection tank 4 through the first backwash water pipe 10, the second backwash water pipe 11, and the concentrated water discharge pipe 12, respectively, for collection. Then, the wastewater is transported to the wastewater pump 5 through the wastewater pipe 13.

[0028] The inlet end of wastewater pump 5 is connected to wastewater pipe 13, and the outlet end of wastewater pump 5 is connected to reclaimed water inlet pipe 14 and wastewater pump outlet pipe 17. A fourth valve 23 is installed on wastewater pump outlet pipe 17. Wastewater in wastewater collection tank 4 is transported to wastewater pump 5 through wastewater pipe 13, pressurized by wastewater pump 5, and then transported to reclaimed water device 6 through reclaimed water inlet pipe 14, or to integrated water purifier 8 through wastewater pump outlet pipe 17.

[0029] The inlet of the greywater treatment unit 6 is connected to the greywater inlet pipe 14, which is equipped with a third valve 22. The outlet of the greywater treatment unit 6 is connected to the greywater outlet pipe 15, which is equipped with a fifth valve 24. The concentrate reuse pipe 16 is connected to the greywater outlet pipe 15, with the connection point after the fifth valve 24. After being treated by the greywater treatment unit 6, the wastewater becomes qualified greywater reuse water. The greywater reuse water has low calcium hardness and total alkalinity. The greywater reuse water is transported to the circulating water unit 7 through the greywater outlet pipe 15 as makeup water for the circulating water unit 7, solving the water quality problem caused by makeup water in traditional processes. The setting of the third valve 22 and the fifth valve 24 can precisely control the water flow path, ensure the efficient operation of the greywater treatment unit 6, and adjust the flow direction of the greywater reuse water as needed.

[0030] The inlet of the circulating water device 7 is connected to the greywater outlet pipe 15. During operation, the circulating water device 7 needs to be replenished promptly to meet the circulating water requirements of the various cooling and heat dissipation equipment due to evaporation, transport losses, and other reasons. The replenished water enters the circulating water device 7 through the greywater outlet pipe 15.

[0031] The inlet of the integrated water purifier 8 is connected to the outlet pipe 17 of the wastewater pump, and the outlet is connected to the inlet pipe 18 of the clean water pump. The wastewater, after being pressurized by the wastewater pump 5, can enter the integrated water purifier 8 through the outlet pipe 17 of the wastewater pump. After the integrated water purifier 8 removes impurities from the water, it is transported to the clean water pump 9 for pressurization through the inlet pipe 18 of the clean water pump.

[0032] The inlet end of the water pump 9 is connected to the water pump inlet pipe 18, and the outlet end is connected to the water pump outlet pipe 19. The clean water treated by the integrated water purifier 8 enters the water pump 9 through the water pump inlet pipe 18 for pressurization, and then is delivered to the water point of the system through the water pump outlet pipe 19.

[0033] When the circulating water has low calcium hardness and total alkalinity, and is in a corrosive state, close the first valve 20, the third valve 22, and the fifth valve 24, and open the second valve 21 and the fourth valve 23. At this time, the concentrated water with high calcium hardness and total alkalinity is no longer discharged into the wastewater collection tank 4, but instead enters the circulating water device 7 through the concentrated water reuse pipe 16 as makeup water for the circulating water device 7, increasing the calcium hardness and total alkalinity of the circulating water, maintaining a balanced water quality, and preventing corrosion of the cooling equipment. Meanwhile, the backwash water enters the integrated water purifier 8 through the wastewater pump outlet pipe 17 for purification. Under this condition, neither the backwash water nor the concentrated water enters the greywater device 6, effectively reducing the load on the greywater device 6.

[0034] When the circulating water has high calcium hardness and total alkalinity, and is in a scaling state, open valves 20, 22, and 24, and close valves 21 and 23. At this time, the concentrated water with high calcium hardness and total alkalinity is discharged into the wastewater collection tank 4 through the concentrated water discharge pipe 12. The concentrated water and backwash water are pressurized by the wastewater pump 5 and then enter the greywater device 6 through the greywater inlet pipe 14. After being purified and treated into qualified greywater with low calcium hardness and total alkalinity, it is reused and then enters the circulating water device 7 through the greywater outlet pipe 15 as makeup water for the circulating water device 7. This reduces the calcium hardness and total alkalinity of the circulating water, keeps the circulating water quality in a balanced state, and prevents scaling in the cooling equipment and pipes, which would affect heat exchange efficiency.

[0035] Therefore, this utility model adopts the above-mentioned backwash water concentrate recycling device, which significantly reduces the operating load and cost of the greywater device, optimizes the water quality balance of the circulating water system, prevents corrosion or scaling of cooling equipment, and thus ensures the efficient and stable operation of the entire water treatment system.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A backwash water concentrate recovery and utilization device, characterized in that, It includes a first filter device, a second filter device, and a third filter device. The first filter device, the second filter device, and the third filter device are respectively connected to the inlet end of the wastewater collection tank. The outlet end of the wastewater collection tank is connected to the wastewater pipe. The wastewater pipe is connected to the inlet end of the wastewater pump. The outlet end of the wastewater pump is connected to the greywater treatment mechanism. The outlet end of the wastewater pump is also connected to the water purification mechanism.

2. The backwash water concentrate recovery and utilization device according to claim 1, characterized in that, The first filtration device includes a valveless filter tank, the outlet end of which is connected to a first backwash water pipe, and the first backwash water pipe is connected to the inlet end of the wastewater collection tank.

3. The backwash water concentrate recovery and utilization device according to claim 2, characterized in that, The second filtration device includes an ultrafiltration device, the outlet of which is connected to a second backwash water pipe, which is connected to the inlet of the wastewater collection tank.

4. The backwash water concentrate recovery and utilization device according to claim 3, characterized in that, The third filtration device includes a reverse osmosis device, the outlet of which is connected to a concentrate discharge pipe, and the concentrate discharge pipe is connected to the inlet of the wastewater collection tank.

5. The backwash water concentrate recovery and utilization device according to claim 4, characterized in that, The greywater treatment unit includes a greywater inlet pipe, one end of which is connected to the wastewater pump, and the other end of which is connected to a greywater device. The greywater device is connected to a greywater outlet pipe, and the greywater outlet pipe is connected to a circulating water device.

6. The backwash water concentrate recovery and utilization device according to claim 5, characterized in that, The water purification mechanism includes a wastewater pump outlet pipe, one end of which is connected to a wastewater pump, and the other end of which is connected to an integrated water purifier. The integrated water purifier is connected to a clean water pump outlet pipe.

7. The backwash water concentrate recovery and utilization device according to claim 6, characterized in that, The reverse osmosis unit is also connected to a concentrate reuse pipe, which is connected to a greywater outlet pipe. A fifth valve is installed on the greywater outlet pipe, with the connection point located after the output end of the fifth valve.

8. The backwash water concentrate recovery and utilization device according to claim 7, characterized in that, A first valve is installed on the concentrated water discharge pipe, a second valve is installed on the concentrated water reuse pipe, a third valve is installed on the reclaimed water inlet pipe, and a fourth valve is installed on the wastewater pump outlet pipe.

9. The backwash water concentrate recovery and utilization device according to claim 8, characterized in that, The outlet end of the ultrafiltration device is also connected to a filter tube, and the other end of the filter tube is connected to the reverse osmosis device.

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