A reverse osmosis concentrate recovery and utilization device

Abstract

This utility model discloses a reverse osmosis concentrate recovery and utilization device, including a raw water tank, a primary ultrafiltration device, a primary reverse osmosis device, a secondary reverse osmosis device, and a demineralized water tank. The raw water tank, the primary ultrafiltration device, the primary reverse osmosis device, the secondary reverse osmosis device, and the demineralized water tank are connected in sequence. A main recovery pipeline is provided between the primary ultrafiltration device and the primary reverse osmosis device. The concentrate outlet of the secondary reverse osmosis device and the clean water outlet of the primary ultrafiltration device converge and enter the primary reverse osmosis device. This scheme adopts a synergistic configuration of the concentrate reverse osmosis device and the primary / secondary reverse osmosis. The ultrafiltration effluent is pretreated by an integrated water purifier before entering the closed-loop design for reuse reverse osmosis. This increases the overall system recovery rate from about 63% to 75%-80%.

Description

Technical Field

[0001] This utility model relates to the field of reverse osmosis water treatment technology for industrial boilers, and in particular to a reverse osmosis concentrate recovery and utilization device. Background Technology

[0002] In the field of industrial boiler reverse osmosis water treatment, the concentrate typically contains high concentrations of salt, hardness ions, and other impurities. This directly impacts the efficiency of the concentrate reuse system, affecting water resource utilization and environmental compliance. Traditional boiler reverse osmosis water treatment systems suffer from the following technical drawbacks: Low recovery rate: Existing reverse osmosis water treatment systems use a dual-membrane process with a recovery rate of only about 63%, resulting in the direct discharge of a large amount of concentrated water and serious waste of water resources.

[0003] Imperfect process: The reverse osmosis concentrate was not treated in a secondary manner, the wastewater from the ultrafiltration and reverse osmosis units was not effectively recycled, and the overall energy efficiency of the system was limited.

[0004] Equipment aging and incompatibility: The dosing device has exceeded its service life, the metering pump and dosing tank are aging, and it has not achieved efficient coordination with the new process modules (such as concentrate reverse osmosis), resulting in poor system stability.

[0005] Environmental risks: High concentration of concentrated wastewater (approximately 230,000 m³ / year) 3 (This section appears to be incomplete and requires further context.)

[0006] The above-mentioned problems urgently require an integrated, high-recovery-rate concentrate reuse technology to improve resource utilization efficiency and reduce environmental pressure. Utility Model Content

[0007] The purpose of this invention is to provide a reverse osmosis concentrate recovery and utilization device that addresses the above-mentioned shortcomings, solving the problems of low recovery rate, imperfect process, aging equipment and insufficient compatibility in the prior art.

[0008] This utility model is achieved through the following solution: A reverse osmosis concentrate recovery and utilization device includes a raw water tank, a primary ultrafiltration unit, a primary reverse osmosis unit, a secondary reverse osmosis unit, and a demineralized water tank; the raw water tank, the primary ultrafiltration unit, the primary reverse osmosis unit, the secondary reverse osmosis unit, and the demineralized water tank are connected in sequence, a main recovery pipeline is provided between the primary ultrafiltration unit and the primary reverse osmosis unit, and the concentrate outlet of the secondary reverse osmosis unit and the clean water outlet of the primary ultrafiltration unit converge and enter the primary reverse osmosis unit.

[0009] Based on the structure of the above-mentioned reverse osmosis concentrate recycling device, the main recycling pipeline includes an integrated water purifier, a reuse ultrafiltration device, and a reuse reverse osmosis device; the integrated water purifier is connected to the concentrate outlet of the first-stage ultrafiltration device, the outlet of the integrated water purifier is connected to the reuse ultrafiltration device, the reuse ultrafiltration device is connected to the reuse reverse osmosis device through a reuse ultrafiltration product water tank, and the reuse reverse osmosis device is connected to the water tank of the first-stage reverse osmosis device.

[0010] Based on the structure of the above-mentioned reverse osmosis concentrate recycling device, the concentrate outlet of the primary ultrafiltration device is provided with a first outlet and a second outlet. The first outlet is directly connected to the first discharge pool, and the second outlet is connected to the integrated water purifier. The outlet of the integrated water purifier is connected to the first discharge pool.

[0011] Based on the structure of the above-mentioned reverse osmosis concentrate recovery and utilization device, the concentrate outlet of the reuse ultrafiltration device and the outlet of the primary ultrafiltration device are merged.

[0012] Based on the structure of the above-mentioned reverse osmosis concentrate recycling device, the reuse ultrafiltration device is equipped with a reuse ultrafiltration product water tank, which is directly connected to the inlet of the reuse reverse osmosis device, the clear water outlet of the reuse reverse osmosis device is connected to the first-stage reverse osmosis water tank, and the concentrate outlet of the reuse reverse osmosis device is connected to the second discharge pool.

[0013] Based on the structure of the above-mentioned reverse osmosis concentrate recovery and utilization device, the primary reverse osmosis device is externally connected to a secondary recovery pipeline; a concentrate reverse osmosis device is installed in the secondary recovery pipeline, the inlet of the concentrate reverse osmosis device is connected to the concentrate outlet of the primary reverse osmosis device, and the clear water outlet of the concentrate reverse osmosis device is connected to the water tank of the primary reverse osmosis device; the clear water outlet of the concentrate reverse osmosis device is divided into two paths, one path is connected to the recovery ultrafiltration permeate tank, and the other path is connected to the third discharge pool; Based on the structure of the above-mentioned reverse osmosis concentrate recycling device, the integrated water purifier is provided with an inclined tube sedimentation zone.

[0014] Based on the structure of the above-mentioned reverse osmosis concentrate recycling device, the integrated water purifier is provided with a multi-media filter layer, which includes a manganese sand filter layer, a pebble pad layer and a porous plate.

[0015] Based on the structure of the above-mentioned reverse osmosis concentrate recovery and utilization device, the reuse ultrafiltration device adopts a hollow fiber ultrafiltration membrane.

[0016] Based on the structure of the above-mentioned reverse osmosis concentrate recovery and utilization device, the membrane pore size of the reuse ultrafiltration device is 0.02μm.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: 1. This solution includes a main recovery pipeline for recycling the concentrate from the primary ultrafiltration unit, which can greatly improve the overall water recovery rate from 63% to 75%-80%. At the same time, the concentrate from the secondary osmosis unit is combined with that from the primary ultrafiltration unit to achieve closed-loop recycling, further improving the overall water recovery rate.

[0018] 2. This solution adopts a synergistic configuration of concentrated water reverse osmosis unit and primary / secondary reverse osmosis; the ultrafiltration drainage is pretreated by an integrated water purifier and then enters a closed-loop design for reuse reverse osmosis; thus increasing the overall system recovery rate from about 63% to 75%-80%. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the integrated water purifier in this utility model; Figure Descriptions: 1. Raw water tank; 2. Primary ultrafiltration unit; 3. Primary reverse osmosis unit; 4. Secondary reverse osmosis unit; 5. Demineralized water tank; 6. Main recovery pipeline; 7. Secondary recovery pipeline; 21. First outlet; 22. Second outlet; 23. First discharge tank; 61. Integrated water purifier; 62. Recycled ultrafiltration unit; 63. Recycled reverse osmosis unit; 64. Recycled ultrafiltration product water tank; 65. Second discharge tank; 66. Primary reverse osmosis unit tank; 71. Concentrate reverse osmosis unit; 72. Third discharge tank; 611. Inclined tube sedimentation zone; 612. Manganese sand filter layer; 613. Pebble pad layer; 614. Porous plate. Detailed Implementation

[0020] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0021] Any feature disclosed in this specification (including any appended claims and abstract) may be replaced by other equivalent or similar features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0022] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0024] Example 1 like Figures 1-2 As shown, this utility model provides a technical solution: A reverse osmosis concentrate recovery and utilization device includes a raw water tank 1, a primary ultrafiltration device 2, a primary reverse osmosis device 3, a secondary reverse osmosis device 4, and a demineralized water tank 5. The raw water tank 1, the primary ultrafiltration device 2, the primary reverse osmosis device 3, the secondary reverse osmosis device 4, and the demineralized water tank 5 are connected in sequence. A main recovery pipeline 6 is provided between the primary ultrafiltration device 2 and the primary reverse osmosis device 3. The concentrate outlet of the secondary reverse osmosis device 4 and the clean water outlet of the primary ultrafiltration device 2 converge and enter the primary reverse osmosis device 3.

[0025] Based on the above structure, this solution includes a main recovery pipeline 6 for recovering the concentrate from the first-stage ultrafiltration unit 2, which can greatly improve the overall water recovery rate from the original 63% to 75%-80%. At the same time, the concentrate from the second-stage osmosis unit is merged with the first-stage ultrafiltration unit 2 to achieve closed-loop recovery, further improving the overall water recovery rate.

[0026] As an example, the main recovery pipeline 6 may include an integrated water purifier 61, a reuse ultrafiltration device 62, and a reuse reverse osmosis device 63; the integrated water purifier 61 is connected to the concentrate outlet of the first-stage ultrafiltration device 2, the outlet of the integrated water purifier 61 is connected to the reuse ultrafiltration device 62, the reuse ultrafiltration product water tank 64 of the reuse ultrafiltration device 62 is connected to the reuse reverse osmosis device 63, and the reuse reverse osmosis device 63 is connected to the inlet of the first-stage reverse osmosis device water tank 66.

[0027] Based on the above structure, the main recovery pipeline 6 pre-treats the water through the integrated water purifier 61, and then transports the pre-treated water to the reuse ultrafiltration device 62. After passing through the reuse reverse osmosis device 63, the water is treated by the reuse reverse osmosis device 63 and then flows into the first-stage reverse osmosis device 3. Finally, it is discharged into the first-stage ultrafiltration device 2 through the second-stage reverse osmosis device 4 to form a closed-loop recovery.

[0028] As an example, the concentrate outlet of the primary ultrafiltration device 2 is provided with a first outlet 21 and a second outlet 22. The first outlet 21 is directly connected to the first discharge tank 23, and the second outlet 22 is connected to the integrated water purifier 61. The outlet of the integrated water purifier 61 is connected to the first discharge tank 23.

[0029] Based on the above structure, under normal circumstances, the concentrated water from the first-stage ultrafiltration device 2 is directly discharged into the integrated water purifier 61 for pretreatment. The wastewater generated after pretreatment by the integrated water purifier 61 enters the first discharge pool 23. Under special circumstances, when the main recovery pipeline 6 needs to be repaired or cannot handle the situation, the concentrated water generated by the first-stage ultrafiltration device 2 is directly discharged into the first discharge pool 23. This makes the entire main recovery pipeline 6 more flexible and safer to use.

[0030] As an example, the concentrate outlet of the reuse ultrafiltration unit 62 merges with the outlet of the primary ultrafiltration unit 2.

[0031] Based on the above structure, the concentrated water produced by the reuse ultrafiltration device 62 can be recycled back to the integrated water purifier 61 along with the first-stage ultrafiltration device 2 for further treatment, thereby improving the overall water recovery rate.

[0032] As an example, the ultrafiltration recycling device 62 is equipped with an ultrafiltration recycling product water tank 64, which is directly connected to the inlet of the reverse osmosis recycling device 63. The clean water outlet of the reverse osmosis recycling device 63 is connected to the first-stage reverse osmosis water tank, and the concentrate outlet of the reverse osmosis recycling device 63 is connected to the second discharge tank 65.

[0033] Based on the above structure, the purified water produced by the ultrafiltration unit 62 is further treated by the reverse osmosis unit 63, the waste liquid is discharged into the second discharge pool 65, and the purified liquid is returned to the first-stage reverse osmosis unit 3 for recycling. Compared with the traditional method, the wastewater can be further recycled and treated, and the overall wastewater recycling rate can be improved.

[0034] As an example, the primary reverse osmosis unit 3 is externally connected to a secondary recovery pipeline 7; a concentrate reverse osmosis unit 71 is installed in the secondary recovery pipeline 7, the inlet of the concentrate reverse osmosis unit 71 is connected to the concentrate outlet of the primary reverse osmosis unit 3, and the clear water outlet of the concentrate reverse osmosis unit 71 is connected to the water tank 66 of the primary reverse osmosis unit; the clear water outlet of the concentrate reverse osmosis unit 71 is divided into two paths, one path is connected to the recovery ultrafiltration product water tank, and the other path is connected to the third discharge pool 72. Based on the above structure, the concentrated water produced by the primary reverse osmosis unit 3 can be treated again by setting up the secondary recovery pipeline 7. The reverse osmosis water enters the recovery ultrafiltration permeate tank and is treated again by the main recovery pipeline 6. Liquid that cannot be treated in time is discharged to the outside through the third discharge pool 72.

[0035] As an example, the integrated water purifier 61 is an existing device. The integrated water purifier 61 is provided with an inclined tube sedimentation zone 611, which can improve the sedimentation efficiency.

[0036] As an example, the integrated water purifier 61 is provided with a multi-media filtration layer, which may include a manganese sand filter layer 612, a pebble pad layer 613, and a porous plate 614; multiple water bodies are filtered through the manganese sand filter layer 612, the pebble pad layer 613, and the porous plate 614, thereby improving the overall purification effect.

[0037] As an example, the reuse ultrafiltration device 62 uses a hollow fiber ultrafiltration membrane (PVDF material) with a membrane pore size of 0.02 μm.

[0038] The core functions of the integrated water purifier 61 in this solution are: 1. Pre-treatment of the ultrafiltration drainage from the original system; 2. Removal of suspended solids, colloids and other impurities from the water, reducing turbidity; 3. Providing stable influent water quality for subsequent reuse devices. It adopts an integrated design of "mixing + flocculation + sedimentation + filtration", with a built-in inclined tube sedimentation zone 611 to improve sedimentation efficiency, multi-media filter layer, fully automatic backwashing function, and adjustable cycle.

[0039] Key operating parameters: Design processing capacity: 20m 3 / h; Effluent turbidity: ≤2NTU; Suspended solids removal rate: ≥95%; Backwash cycle: 24-48 hours / time.

[0040] The core functions of the ultrafiltration device 62 are: 1. Deep treatment of the water produced by the integrated water purifier 61; 2. Retention of microorganisms, colloids and other tiny particles; 3. Protection of subsequent reverse osmosis membrane elements.

[0041] It adopts a hollow fiber ultrafiltration membrane (PVDF material) with a membrane pore size of 0.02μm, cross-flow operation mode to reduce membrane fouling, and is equipped with a chemically enhanced backwash (CEB) system.

[0042] Key operating parameters: Design water production: 15m³ 3 / h; Recovery rate: ≥90%; Operating pressure: 0.1-0.3MPa; Product water SDI15: ≤3.

[0043] The core functions of the reverse osmosis reuse unit 63 are: 1. Deep desalination of ultrafiltration permeate, concentrate, and reverse osmosis concentrate; 2. Realization of concentrate resource reuse; 3. Reduction of system raw water consumption.

[0044] It adopts a single-stage, two-stage design, equipped with a scale inhibitor dosing system and a variable frequency high-pressure pump. Key operating parameters: Design water production: 14m³ 3 / h; System recovery rate: 70%.

[0045] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A reverse osmosis concentrate recovery and utilization device, characterized in that: It includes a raw water tank (1), a primary ultrafiltration device (2), a primary reverse osmosis device (3), a secondary reverse osmosis device (4), and a demineralized water tank (5); the raw water tank (1), the primary ultrafiltration device (2), the primary reverse osmosis device (3), the secondary reverse osmosis device (4), and the demineralized water tank (5) are connected in sequence. A main recovery pipeline (6) is provided between the primary ultrafiltration device (2) and the primary reverse osmosis device (3). The concentrated water outlet of the secondary reverse osmosis device (4) and the clear water outlet of the primary ultrafiltration device (2) flow into the primary reverse osmosis device (3).

2. The reverse osmosis concentrate recovery and utilization device as described in claim 1, characterized in that: The main recovery pipeline (6) includes an integrated water purifier (61), a reuse ultrafiltration device (62), and a reuse reverse osmosis device (63); the integrated water purifier (61) is connected to the concentrated water outlet of the first-stage ultrafiltration device (2), the outlet of the integrated water purifier (61) is connected to the reuse ultrafiltration device (62), the reuse ultrafiltration device (62) is connected to the reuse reverse osmosis device (63) through the reuse ultrafiltration product water tank (64), and the reuse reverse osmosis device (63) is connected to the water tank (66) of the first-stage reverse osmosis device.

3. The reverse osmosis concentrate recovery and utilization device as described in claim 2, characterized in that: The concentrated water outlet of the primary ultrafiltration device (2) is provided with a first outlet (21) and a second outlet (22). The first outlet (21) is directly connected to the first discharge pool (23), and the second outlet (22) is connected to the integrated water purifier (61). The outlet of the integrated water purifier (61) is connected to the first discharge pool (23).

4. The reverse osmosis concentrate recovery and utilization device as described in claim 3, characterized in that: The concentrated water outlet of the reuse ultrafiltration device (62) merges with the outlet of the primary ultrafiltration device (2).

5. A reverse osmosis concentrate recovery and utilization device as described in claim 4, characterized in that: The ultrafiltration recycling device (62) is equipped with an ultrafiltration recycling product water tank (64), which is directly connected to the inlet of the reverse osmosis recycling device (63). The clear water outlet of the reverse osmosis recycling device (63) is connected to the first-stage reverse osmosis water tank, and the concentrated water outlet of the reverse osmosis recycling device (63) is connected to the second discharge tank (65).

6. The reverse osmosis concentrate recovery and utilization device as described in claim 5, characterized in that: The primary reverse osmosis unit (3) is externally connected to a secondary recovery pipeline (7); a concentrate reverse osmosis unit (71) is installed in the secondary recovery pipeline (7), the inlet of the concentrate reverse osmosis unit (71) is connected to the concentrate outlet of the primary reverse osmosis unit (3), and the clear water outlet of the concentrate reverse osmosis unit (71) is connected to the water tank (66) of the primary reverse osmosis unit; the clear water outlet of the concentrate reverse osmosis unit (71) is divided into two paths, one path is connected to the recovery ultrafiltration product water tank, and the other path is connected to the third discharge pool (72).

7. A reverse osmosis concentrate recovery and utilization device as described in claim 6, characterized in that: The integrated water purifier (61) is provided with an inclined tube sedimentation zone (611).

8. A reverse osmosis concentrate recovery and utilization device as described in claim 7, characterized in that: The integrated water purifier (61) is provided with a multi-media filter layer, which includes a manganese sand filter layer (612), a pebble pad layer (613), and a porous plate (614).

9. A reverse osmosis concentrate recovery and utilization device as described in claim 8, characterized in that: The reuse ultrafiltration device (62) uses a hollow fiber ultrafiltration membrane.

10. A reverse osmosis concentrate recovery and utilization device as described in claim 9, characterized in that: The membrane pore size of the ultrafiltration device (62) is 0.02 μm.

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