Strong brine recovery device

Abstract

The utility model relates to the field of desalted water devices, in particular to a strong brine recovery device which comprises a strong brine tank, a primary reverse osmosis device, a secondary reverse osmosis device and a circulating water device, the strong brine tank is connected with a water inlet of the first-stage reverse osmosis device, a fresh water end of the first-stage reverse osmosis device is connected with a water inlet of the second-stage reverse osmosis device or the circulating water device, and concentrated water ends of the first-stage reverse osmosis device and the second-stage reverse osmosis device are connected with an external process; a water quality detection module is arranged at the fresh water end of the second-stage reverse osmosis device, and effluent of the fresh water end of the second-stage reverse osmosis device is conveyed in a graded manner according to water quality. According to the utility model, reverse osmosis is carried out on strong brine by stages through the arrangement of the two-stage four-section module, and the water quality detection module is arranged at the fresh water end of the two-stage reverse osmosis device, so that a desalted water supplementing source with a stricter water quality index or a circulating water supplementing source with a relatively low water quality index can be switched at any time according to the water quality index condition; graded utilization of water is achieved, and the purpose of saving water is achieved.

Description

Technical Field

[0001] The utility model relates to the field of desalted water devices, in particular to a concentrated brine recovery device. Background Art

[0002] Desalted water units are often equipped with recycled water units. The recycled water sources are mostly backwash water generated by backwashing of the unit's multi-media filters and concentrated water from the reverse osmosis unit, referred to as concentrated brine (current indicators include pH: 7-9, conductivity: 1800-2000us / cm, turbidity: 5-8NTU, Fe2+0.5mg / l, Cl-200-250mg / l, alkalinity 250-300mg / l, total hardness 500-550mg / l, Ca2+200-250mg / l, NH3-N: 1-5mg / l, Zn2+: 1-1.5mg / l, COD: 20-50mg / l). Since the indicators of concentrated brine are relatively high, if discharged to a sewage treatment unit, there will be no substantial reduction in the above indicators after treatment by the sewage treatment unit. If used as a water replenishment source for a circulating water unit, the above indicators of the unit will also be higher than those of normal water replenishment.

[0003] Therefore, there is an urgent need for a concentrated brine recovery device to process this water and recycle it to save water resources. Utility Model Content

[0004] In order to overcome the problems existing in the prior art, the utility model aims to provide a concentrated brine recovery device.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a brine recovery device, comprising a brine tank, a primary reverse osmosis device, a secondary reverse osmosis device and a circulating water device; the brine tank is connected to the water inlet of the primary reverse osmosis device, the fresh water end of the primary reverse osmosis device is connected to the water inlet or the circulating water device of the secondary reverse osmosis device, and the concentrated water end of the primary reverse osmosis device is connected to an external process; the concentrated water end of the secondary reverse osmosis device is connected to an external process, and a water quality detection module is provided at the fresh water end of the secondary reverse osmosis device, and the water outlet of the fresh water end of the secondary reverse osmosis device is graded and transported according to the water quality.

[0006] The utility model is further configured as follows: the first-stage reverse osmosis device includes a first-stage module and a second-stage module, and the first-stage module and the second-stage module each include a plurality of membrane shells;

[0007] The two-stage reverse osmosis device includes a two-stage first-stage module and a two-stage second-stage module, and the two-stage first-stage module and the two-stage second-stage module respectively include a plurality of membrane shells;

[0008] One end of the membrane shell is provided with a membrane shell water inlet, and the other end is provided with a membrane shell fresh water inlet and a membrane shell concentrated water inlet.

[0009] The utility model is further configured as follows: the ratio of the number of membrane shells in the first-stage one-stage module and the first-stage two-stage module is 2:1;

[0010] The ratio of the number of membrane shells in the secondary first-stage module and the secondary second-stage module is 2:1.

[0011] The utility model is further configured as follows: the membrane shell water inlet of the first-stage module is connected to the concentrated brine tank, the membrane shell concentrated water outlet of the first-stage module is connected to the water inlet of the first-stage two-stage module; the concentrated water outlet of the first-stage two-stage module is connected to an external process.

[0012] The utility model is further configured as follows: a first booster pump is provided between the water inlet of the membrane shell of the first-stage module and the concentrated brine tank.

[0013] The utility model is further configured as follows: the brine recovery device also includes a first-level reverse osmosis water tank, which is arranged between the first-level reverse osmosis device and the second-level reverse osmosis device, and the fresh water inlets of the membrane shells of the first-level first-stage module and the first-level second-stage module are connected in parallel to form the fresh water end of the first-level reverse osmosis device, and the first-level reverse osmosis water tank stores water from the fresh water end of the first-level reverse osmosis device, which is transported to the second-level reverse osmosis device through a second booster pump.

[0014] The utility model is further configured as follows: the fresh water inlet of the membrane shell of the first-stage module and the first-stage second-stage module is connected to the water inlet of the first-stage reverse osmosis water tank, and the water outlet of the first-stage reverse osmosis water tank is connected to the water inlet of the membrane shell of the second-stage first-stage module.

[0015] The utility model is further configured as follows: the concentrated water outlet of the membrane shell of the secondary first-stage module is connected to the water inlet of the secondary second-stage module; and the concentrated water outlet of the secondary second-stage module is connected to an external process.

[0016] The utility model is further configured as follows: the fresh water outlets of the membrane shells of the secondary first-stage module and the secondary second-stage module are connected in parallel to the fresh water end of the secondary reverse osmosis device, and the fresh water end of the secondary reverse osmosis device is respectively connected to the desalted water primary water tank, the desalted water raw water tank, the circulating water device and the ground discharge outlet; solenoid valves are respectively arranged between the fresh water end of the secondary reverse osmosis device and the desalted water primary water tank, the desalted water raw water tank, the circulating water device and the ground discharge outlet.

[0017] The present invention is further configured as follows: the water quality detection module includes a conductivity meter, and the conductivity meter and the solenoid valve are both electrically connected to an external control system.

[0018] In summary, the beneficial effects of the above technical solution of the present utility model are as follows:

[0019] The utility model adopts the setting of two-stage four-section modules to perform reverse osmosis on concentrated brine in stages, and a water quality detection module is provided at the fresh water end of the two-stage reverse osmosis device. According to the water quality index, the desalted water replenishment source with stricter water quality index or the circulating water replenishment source with relatively lower water quality index can be switched at any time to realize the graded utilization of water quality and achieve the purpose of water saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. 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 creative work.

[0021] Figure 1 This is a schematic structural diagram of the concentrated brine recovery device described in an embodiment of the present utility model.

[0022] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0023] 1. Brine tank, 2. First booster pump, 3. First stage module, 4. First stage module, 5. First stage reverse osmosis tank, 6. Second booster pump, 7. Second stage module, 8. Second stage module, 9. First stage desalted water tank, 10. Desalted water raw water tank, 11. Circulating water device, 12. Ground discharge port. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the following is a clear and complete description of the technical solution of the present invention in conjunction with the drawings of the present invention. Based on the embodiments of the present invention, other similar embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present invention. In addition, the directional words mentioned in the following embodiments, such as "up", "down", "left", "right", etc., are only referenced to the directions of the drawings. Therefore, the directional words used are used to illustrate rather than limit the invention of the present invention.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0026] The present invention will be further described below with reference to the accompanying drawings and preferred embodiments.

[0027] Example:

[0028] like Figure 1 As shown in FIG, it is a preferred embodiment of the present utility model, wherein the dotted line represents concentrated water and the solid line represents fresh water.

[0029] A brine recovery device comprises a brine tank 1, a primary reverse osmosis device, a secondary reverse osmosis device and a circulating water device 11; the brine tank 1 is connected to the water inlet of the primary reverse osmosis device, the fresh water end of the primary reverse osmosis device is connected to the water inlet of the secondary reverse osmosis device or the circulating water device 11, the concentrated water end of the primary reverse osmosis device and the concentrated water end of the secondary reverse osmosis device are connected to an external process, a water quality detection module is provided at the fresh water end of the secondary reverse osmosis device, and the effluent of the fresh water end of the secondary reverse osmosis device is graded and transported according to the water quality detected by the water quality detection module.

[0030] The primary reverse osmosis device and the secondary reverse osmosis device are connected in series, and the fresh water of the primary reverse osmosis device is filtered again as the concentrated water of the secondary reverse osmosis device.

[0031] The first-stage reverse osmosis device includes a first-stage module 3 and a first-stage module 4, and the first-stage module 3 and the first-stage module 4 each include a plurality of membrane shells; the second-stage reverse osmosis device includes a second-stage module 7 and a second-stage module 8, and the second-stage module 7 and the second-stage module 8 each include a plurality of membrane shells;

[0032] One end of the membrane shell is provided with a membrane shell water inlet, and the other end is provided with a membrane shell fresh water inlet and a membrane shell concentrated water inlet.

[0033] The optimal treatment effect is achieved when the ratio of the number of membrane shells in the first-stage module 3 and the first-stage second-stage module 4 is 2:1; and the ratio of the number of membrane shells in the second-stage first-stage module 7 and the second-stage second-stage module 8 is 2:1. In this embodiment, the first-stage first-stage module 3 has 20 membrane shells, the first-stage second-stage module 4 has 10 membrane shells, the second-stage first-stage module 7 has 16 membrane shells, and the second-stage second-stage module 8 has 8 membrane shells.

[0034] The membrane shell water inlet of the first-stage module 3 is connected to the brine tank 1, and the brine outlet of the membrane shell of the first-stage module 3 is connected to the water inlet of the first-stage second-stage module 4; the brine outlet of the first-stage second-stage module 4 is connected to an external process. A first booster pump 2 is provided between the membrane shell water inlet of the first-stage first-stage module 3 and the brine tank 1.

[0035] The brine recovery device also includes a first-level reverse osmosis water tank 5 and a second booster pump 6. The first-level reverse osmosis water tank 5 is arranged between the first-level reverse osmosis device and the second-level reverse osmosis device. The fresh water inlets of the membrane shells of the first-level first-stage module 3 and the first-level second-stage module 4 are connected in parallel to form the fresh water end of the first-level reverse osmosis device. The first-level reverse osmosis water tank 5 stores water from the fresh water end of the first-level reverse osmosis device, which is transported to the second-level reverse osmosis device through the second booster pump 6.

[0036] The booster pump in this embodiment is a variable frequency pump with an operating pressure of 0.6-1.7 MPA. The pressure difference between the fresh water end and the concentrated water end results in the best reverse osmosis water production effect, ensuring that the water quality of the produced concentrated brine is reduced to an effective range.

[0037] It should be noted that a water quality detection module can also be set up at the fresh water outlet of the membrane shell of the first-stage second-stage module 4, and the water outlet of the fresh water outlet of the membrane shell of the first-stage second-stage module 4 is transported to the first-stage reverse osmosis water tank 5 or the circulating water device 11 according to the detection results.

[0038] The fresh water inlets of the membrane shells of the first-stage module 3 and the first-stage second-stage module 4 are connected to the water inlet of the first-stage reverse osmosis water tank 2 , and the water outlet of the first-stage reverse osmosis water tank 2 is connected to the water inlet of the membrane shell of the second-stage first-stage module 7 .

[0039] The concentrated water outlet of the membrane shell of the secondary first-stage module 7 is connected to the water inlet of the secondary second-stage module 8; the concentrated water outlet of the secondary second-stage module 8 is connected to the external process.

[0040] The membrane shell freshwater inlets of the secondary first-stage module 7 and the secondary second-stage module 8 are connected in parallel to the freshwater end of the secondary reverse osmosis device, which is respectively connected to the desalted water primary water tank 9, the desalted water raw water tank 10, the circulating water device 11, and the ground discharge port 12. A first solenoid valve is provided on the pipeline connecting the freshwater end of the secondary reverse osmosis device and the desalted water primary water tank 9, a second solenoid valve is provided on the pipeline connecting the freshwater end of the secondary reverse osmosis device and the desalted water raw water tank 10, a third solenoid valve is provided on the pipeline connecting the freshwater end of the secondary reverse osmosis device and the circulating water device 11, and a fourth solenoid valve is provided on the pipeline connecting the freshwater end of the secondary reverse osmosis device and the ground discharge port 12. The water quality detection module includes a conductivity meter, and both the conductivity meter and the solenoid valve are electrically connected to an external control system.

[0041] In actual use, the concentrated brine is sent to the first-stage reverse osmosis device through the first booster pump 2. The fresh water of the first-stage reverse osmosis device flows out from the central tube of the membrane and is transported to the first-stage reverse osmosis water tank 5 for temporary storage. The concentrated water flows out from the periphery of the membrane. The concentrated water of the first-stage module 3 is used as water replenishment for the first-stage second-stage module 4. The concentrated water of the first-stage module 3 is filtered and recovered again, and finally the concentrated water of the first-stage second-stage module 4 is transported to the external process.

[0042] The external control system controls the opening and closing of the solenoid valves for graded water delivery based on the freshwater conductivity of the secondary reverse osmosis device, as measured by a conductivity meter. In this embodiment, when the conductivity is less than 50 µs / cm, the first solenoid valve to the desalted water primary tank 9 is opened, and the remaining solenoid valves are closed. When the conductivity is 50 µs / cm < 100 µs / cm, the second solenoid valve to the desalted water raw tank 10 is opened, and the remaining valves are closed. When the conductivity is greater than 100 µs / cm, the third valve to the circulating water device 11 is opened, and the remaining valves are closed. When the conductivity is greater than 200 µs / cm, the fourth solenoid valve to the ground discharge port 12 is opened, indicating that the system is ready to stop operation for chemical cleaning or membrane replacement.

[0043] The device described in the utility model can reduce various indicators of concentrated brine by 60%. After experimental verification, the indicators of concentrated brine are as follows: pH: 7-9, conductivity ≤800us / cm, turbidity ≤3NTU, Fe2+ ≤0.5mg / l, Cl- ≤100mg / l, alkalinity ≤150mg / l, total hardness ≤300mg / l, Ca2+ ≤150mg / l, NH3-N ≤5mg / l, Zn2+: ≤1mg / l, COD ≤20mg / l.

[0044] To sum up, the utility model performs reverse osmosis on concentrated brine in stages through the setting of a two-stage four-section module, and is provided with a water quality detection module at the fresh water end of the two-stage reverse osmosis device. According to the water quality indicators, the desalted water replenishment source with more stringent water quality indicators or the circulating water replenishment source with relatively low water quality indicators can be switched at any time to realize the graded utilization of water quality and achieve the purpose of water saving.

[0045] Finally, it should be noted that the above content is only used to illustrate the technical solution of the utility model, rather than to limit the scope of protection of the utility model. Simple modifications or equivalent replacements of the technical solution of the utility model by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the utility model.

Claims

1. A concentrated brine recovery device, characterized in that: It includes a concentrated brine tank, a primary reverse osmosis device, a secondary reverse osmosis device and a circulating water device; the concentrated brine tank is connected to the water inlet of the primary reverse osmosis device, the fresh water end of the primary reverse osmosis device is connected to the water inlet of the secondary reverse osmosis device or the circulating water device, and the concentrated water ends of the primary reverse osmosis device and the secondary reverse osmosis device are connected to an external process; A water quality detection module is provided at the fresh water end of the secondary reverse osmosis device, and the effluent from the fresh water end of the secondary reverse osmosis device is graded and transported according to the water quality.

2. A concentrated brine recovery device according to claim 1, characterized in that: The first-stage reverse osmosis device includes a first-stage module and a second-stage module, and the first-stage module and the second-stage module each include a plurality of membrane shells; The two-stage reverse osmosis device includes a two-stage first-stage module and a two-stage second-stage module, and the two-stage first-stage module and the two-stage second-stage module respectively include a plurality of membrane shells; One end of the membrane shell is provided with a membrane shell water inlet, and the other end is provided with a membrane shell fresh water inlet and a membrane shell concentrated water inlet.

3. A concentrated brine recovery device according to claim 2, characterized in that: The ratio of the number of membrane shells in the first stage one module and the first stage two module is 2:1; The ratio of the number of membrane shells in the secondary first-stage module and the secondary second-stage module is 2:

1.

4. A concentrated brine recovery device according to claim 2, characterized in that: The membrane shell water inlet of the first-stage module is connected to the concentrated brine tank, and the membrane shell concentrated water outlet of the first-stage module is connected to the water inlet of the first-stage two-stage module; the concentrated water outlet of the first-stage two-stage module is connected to the external process.

5. A concentrated brine recovery device according to claim 4, characterized in that: A first booster pump is provided between the membrane shell water inlet of the first-stage module and the concentrated brine tank.

6. A concentrated brine recovery device according to claim 2, characterized in that: The brine recovery device also includes a first-level reverse osmosis water tank and a second booster pump. The first-level reverse osmosis water tank is arranged between the first-level reverse osmosis device and the second-level reverse osmosis device. The fresh water inlets of the membrane shells of the first-level first-stage module and the first-level second-stage module are connected in parallel to form the fresh water end of the first-level reverse osmosis device. The first-level reverse osmosis water tank stores water from the fresh water end of the first-level reverse osmosis device, which is transported to the second-level reverse osmosis device through the second booster pump.

7. A concentrated brine recovery device according to claim 6, characterized in that: The fresh water inlets of the membrane shells of the first-stage module and the first-stage second-stage module are connected to the water inlet of the first-stage reverse osmosis water tank, and the water outlet of the first-stage reverse osmosis water tank is connected to the water inlet of the membrane shell of the second-stage first-stage module.

8. A concentrated brine recovery device according to claim 7, characterized in that: The membrane shell concentrated water outlet of the secondary first stage module is connected to the water inlet of the secondary second stage module; the concentrated water outlet of the secondary second stage module is connected to the external process.

9. A concentrated brine recovery device according to claim 8, characterized in that: The membrane shell fresh water outlets of the secondary first-stage module and the secondary second-stage module are connected in parallel to form the fresh water end of the secondary reverse osmosis device, and the fresh water end of the secondary reverse osmosis device is respectively connected to the desalted water primary water tank, the desalted water raw water tank, the circulating water device and the ground discharge outlet; solenoid valves are respectively arranged between the fresh water end of the secondary reverse osmosis device and the desalted water primary water tank, the desalted water raw water tank, the circulating water device and the ground discharge outlet.

10. The concentrated brine recovery device according to claim 9, characterized in that: The water quality detection module includes a conductivity meter, and both the conductivity meter and the solenoid valve are electrically connected to an external control system.

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