Saline-alkali water filtering device

Abstract

The utility model discloses a saline-alkaline water filtering device which comprises a pretreatment tank, and a filter screen, a quartz sand filtering layer and an activated carbon filtering layer are sequentially arranged in the pretreatment tank from top to bottom; the bottom end of the pretreatment tank is provided with a first pipeline, the first pipeline is connected with a middle water tank, and the middle water tank is provided with a stirring assembly used for stirring pretreated saline-alkaline water; the water outlet end of the middle water tank is connected with a reverse osmosis filter tank through a second pipeline, and a first booster pump is arranged on the second pipeline; a purified water outlet is formed in the bottom end of the reverse osmosis filter tank and is connected with a purified water tank through a third pipeline. According to the utility model, by arranging the pretreatment tank, the saline-alkaline water can be preliminarily pretreated through the pretreatment tank, the pretreated saline-alkaline water enters the middle water tank, the filtering efficiency of the saline-alkaline water can be improved through the stirring device of the middle water tank, and salt precipitation is avoided; and then the reverse osmosis filter tank is used for filtering the saline-alkaline water.

Description

TECHNICAL FIELD

[0001] The utility model relates to filter device technical field, concretely is a kind of saline-alkali water filter device. BACKGROUND

[0002] In some arid and semi-arid regions, and coastal areas, saline-alkali water is widespread. These saline-alkali water cannot be directly used in agricultural irrigation, industrial production and drinking water and other fields due to its high salt content and alkalinity, and needs effective filtration treatment to reduce its salinity and alkalinity so that it meets the utilization standard.

[0003] In the prior art, a saline-alkali soil water pipe filter device is disclosed in Chinese Patent No. CN220513576U, which includes a main body mechanism and an auxiliary mechanism. The auxiliary mechanism is located at the upper end of the main body mechanism. The main body mechanism includes a device body and a water inlet pipe. The water inlet pipe is fixedly installed at the left end of the device body. The main body mechanism further includes a water outlet pipe, a sealing door plate, a filter assembly and an anti-clogging assembly. The water outlet pipe is fixedly installed at the right end of the device body. The saline-alkali soil water pipe filter device, by installing the main body mechanism, can perform multiple filtrations on the device body during the filtration of saline-alkali water, thereby improving the filtration quality of saline-alkali water. The design of the anti-clogging assembly can agitate the saline-alkali water, and the use of the scraper can prevent impurities from clogging the filter assembly, thereby ensuring the filtration effect of the device body and improving the automation and protection of the device body.

[0004] The saline-alkali soil water pipe filter device provided by the above patent mainly solves the problem of avoiding impurities from clogging the filter assembly. However, its filtration effect on saline-alkali water is limited, and it cannot effectively purify saline-alkali water. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a saline-alkali water filter device to improve the limited filtration effect of existing filter devices on saline-alkali water and the problem that saline-alkali water cannot be effectively purified.

[0006] The utility model is implemented as follows:

[0007] A saline-alkali water filter device includes a pretreatment tank. Inside the pretreatment tank, from top to bottom, there are a filter screen, a quartz sand filter layer and an activated carbon filter layer. A first pipeline is provided at the bottom end of the pretreatment tank. An intermediate water tank is connected to the first pipeline. A stirring assembly is installed on the intermediate water tank to stir the pretreated saline-alkali water. A reverse osmosis filter box is connected to the water outlet of the intermediate water tank through a second pipeline. A first booster pump is provided on the second pipeline. A clean water outlet is provided at the bottom end of the reverse osmosis filter box. A clean water tank is connected to the clean water outlet through a third pipeline.

[0008] Preferably, the pretreatment tank has a limiting ring along the bottom of the activated carbon filter layer on the inner side, and multiple support legs are provided at the bottom edge of the pretreatment tank. The bottom of each support leg has a bottom ring, and multiple bolt holes are evenly provided on the bottom ring. The top opening of the pretreatment tank is provided with a cover, and the bottom end of the cover is provided with a transition ring, which is threadedly connected to the pretreatment tank. The top of the cover is provided with a water inlet pipe and a return connector.

[0009] Preferably, the intermediate water tank is provided with valves at the top and bottom of its side, and a bearing is provided at the center of the top of the intermediate water tank. The top of the intermediate water tank is provided with a water inlet connector, which is connected to the first pipe. Multiple support rods are evenly provided on the bottom edge of the water tank. The bottom of each support rod is provided with a support ring, which is provided with multiple fixing holes. The bottom of the intermediate water tank is provided with a drain connector, which is connected to the second pipe.

[0010] Preferably, the stirring assembly includes a stirring motor and a stirring rod. The bottom end of the stirring rod is provided with multiple stirring blades, and the top end of the stirring rod is interference-fitted with a bearing. The top of the stirring rod is provided with a drive slot, and the output end of the stirring motor is plugged into the drive slot. The end of the stirring motor that is in contact with the intermediate water tank is provided with multiple mounting feet.

[0011] Preferably, the reverse osmosis filter box has a first water inlet at the top, and the reverse osmosis filter box has multiple reverse osmosis membrane modules inside, the reverse osmosis membrane modules being spiral wound reverse osmosis membranes; the reverse osmosis filter box has a concentrate outlet at the bottom side.

[0012] Preferably, the water tank has a second water inlet at the top and a water outlet at the bottom.

[0013] Preferably, the system further includes a concentrate tank, a fourth pipe, and a fifth pipe. The concentrate tank has a third inlet at its top, which is connected to the concentrate outlet via the fourth pipe. The concentrate tank also has a reflux port at its top and a drain port at its bottom. A second booster pump is located above the reflux port. The second booster pump has a suction pipe at its suction end, which is connected to the reflux port. The second booster pump's discharge end is connected to the pretreatment tank via the fifth pipe.

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

[0015] 1. This utility model sets up a pretreatment tank, which can perform preliminary pretreatment on the saline water. The pretreated saline water enters the intermediate water tank. The stirring device in the intermediate water tank can improve the filtration efficiency of the saline water and avoid salt precipitation. Then, the saline water is filtered by a reverse osmosis filter box. The filtered clean water enters the clean water tank, thereby achieving the purpose of effectively filtering the saline water.

[0016] 2、 The utility model discloses a concentrated water tank is provided with, and the second booster pump is installed at the top of concentrated water tank, and the water in concentrated water tank can be pumped into the pretreatment tank through the second booster pump and fifth pipeline, so that the concentrated water is filtered multiple times conveniently. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the structure diagram of the whole of the utility model;

[0018] Figure 2 It is the structure diagram of the pretreatment tank of the utility model;

[0019] Figure 3 It is the structure diagram of the intermediate water tank in the utility model;

[0020] Figure 4 It is the structure diagram of the stirring assembly of the utility model.

[0021] In the drawing: 1, pretreatment tank;11, limit ring;12, filter screen;13, quartz sand filter layer;14, activated carbon filter layer;15, support leg;16, bottom ring;161, bolt hole;17, cover;171, adapter ring;172, backflow joint;173, water inlet pipe;2, intermediate water tank;21, stirring assembly;211, stirring rod;2111, drive slot;2112, stirring blade;212, stirring motor;2121, mounting foot;22, valve;23, bearing;24, water inlet joint;25, support rod;26, drainage joint;27, support ring;28, fixing hole;3, first pipeline;4, reverse osmosis filter box;41, first water inlet;42, reverse osmosis membrane assembly;43, concentrated water outlet;44, clean water outlet;5, second pipeline;51, first booster pump;6, clean water tank;61, second water inlet;62, water outlet;7, third pipeline;8, fourth pipeline;9, concentrated water tank;91, third water inlet;92, backflow port;93, blowdown port;10, fifth pipeline;101, second booster pump;102, water suction pipe. DETAILED DESCRIPTION

[0022] In the utility model, unless another explicit provision and limitation, the terms "installation", "connection", "connect", "fix" and so on should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integral;Can be mechanical connection, also can be electrical connection;It can be directly connected, also can be indirectly connected through the intermediate medium, can be the communication of two elements or the interaction of two elements. For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to specific circumstances.

[0023] The following is further illustrated in conjunction with the drawings and specific embodiments:

[0024] Embodiment 1

[0025] As shown in Figure 1 and Figure 2 , a saline water filtering device, including a pretreatment tank 1, the inside of the pretreatment tank 1 is provided with a filter screen 12, a quartz sand filter layer 13 and an activated carbon filter layer 14 from top to bottom in sequence; the pretreatment tank 1 cooperates with the filter screen 12, the quartz sand filter layer 13 and the activated carbon filter layer 14 to facilitate the preliminary filtration of the saline water, and facilitate the use of the saline water. The pore size of the coarse filter screen is 2-5mm, the particle size of the quartz sand filter layer 13 is 0.5-2mm, and the particle size of the activated carbon filter layer 14 is 1-3mm. The bottom end of the pretreatment tank 1 is provided with a first pipeline 3, and the first pipeline 3 is connected with an intermediate water tank 2. The first pipeline 3 is convenient for guiding the pretreated water into the intermediate water tank 2. The intermediate water tank 2 is provided with a stirring assembly 21 for stirring the pretreated saline water; the water outlet end of the intermediate water tank 2 is connected with a reverse osmosis filter tank 4 through a second pipeline 5, and the reverse osmosis filter tank 4 is convenient for reverse osmosis filtration treatment of the stirred water in the intermediate water tank 2. A first booster pump 51 is arranged on the second pipeline 5; a second booster pump 101 is arranged on the second pipeline 5; the second booster pump 101 is convenient for pumping the water in the intermediate water tank 2 into the reverse osmosis filter tank 4. The bottom end of the reverse osmosis filter tank 4 is provided with a clean water outlet 44, and the clean water outlet 44 is connected with a clean water tank 6 through a third pipeline 7. The clean water outlet 44 cooperates with the third pipeline 7 to smoothly pour the purified water into the clean water tank 6 for storage.

[0026] As shown in Figure 2 , a limiting ring 11 is arranged at the bottom of the activated carbon filter layer 14 inside the pretreatment tank 1, and the limiting ring 11 is convenient for limiting and supporting the filter screen 12, the quartz sand filter layer 13 and the activated carbon filter layer 14. A plurality of supporting legs 15 are arranged at the bottom edge of the pretreatment tank 1, and the supporting legs 15 are convenient for supporting the pretreatment tank 1. A bottom ring 16 is arranged at the bottom of the supporting leg 15, and a plurality of bolt holes 161 are uniformly arranged on the bottom ring 16; the cooperation of the bottom ring 16 and the bolt holes 161 is convenient for fixing the position of the pretreatment tank 1 by bolts. A cover 17 is arranged at the top opening of the pretreatment tank 1, a adapter ring 171 is arranged at the bottom end of the cover 17, and the adapter ring 171 is threadedly connected with the pretreatment tank 1; the cover 17 is convenient for disassembly and use. A water inlet pipe 173 and a backflow joint 172 are arranged at the top of the cover 17, and the water inlet pipe 173 is convenient for being connected with a saline water supply pipeline.

[0027] As shown in Figure 3As shown, the top and bottom of the intermediate water tank 2 are provided with valves 22, which are convenient for cleaning the inside of the intermediate water tank 2 or adding medicine to the inside of the intermediate water tank 2. The top of the intermediate water tank 2 is provided with a bearing 23, which is convenient for the rotation of the stirring assembly 21. The top of the intermediate water tank 2 is provided with a water inlet connector 24, which is connected with the first pipeline 3. The bottom edge of the water tank is uniformly provided with a plurality of support rods 25, the bottom of the support rod 25 is provided with a support ring 27, the support ring 27 is provided with a plurality of fixing holes 28, the support rod 25 cooperates with the support ring 27 and the fixing hole 28 to facilitate the position of the intermediate water tank 2 to be fixed by bolts. The bottom end of the intermediate water tank 2 is provided with a drain connector 26, which is connected with the second pipeline 5. The cooperation of the drain connector 26 and the second pipeline 5 is convenient for the detachable connection between the intermediate water tank 2 and the second pipeline 5.

[0028] As shown in the figure, Figure 4 The stirring assembly 21 includes a stirring motor 212 and a stirring rod 211. The bottom end of the stirring rod 211 is provided with a plurality of stirring blades 2112, which are convenient for uniformly mixing the water in the intermediate water tank 2. The top end of the stirring rod 211 is interference connected with the bearing 23, which is convenient for the rotation of the stirring rod 211. The top of the stirring rod 211 is provided with a drive slot 2111, and the output end of the stirring motor 212 and the drive slot 2111 are connected by plug-in connection, which is convenient for the stirring motor 212 to drive the stirring rod 211 to rotate. One end of the stirring motor 212 abutting the intermediate water tank 2 is provided with a plurality of mounting feet 2121, which are convenient for fixing the position of the stirring motor 212 by bolts.

[0029] As shown in the figure, Figure 1 The top end of the reverse osmosis filter box 4 is provided with a first water inlet 41. The inside of the reverse osmosis filter box 4 is provided with a plurality of reverse osmosis membrane assemblies 42, which are spiral-wound reverse osmosis membranes. The reverse osmosis membrane assemblies 42 can effectively filter and treat saline water. The bottom end of the side of the reverse osmosis filter box 4 is provided with a concentrated water outlet 43, which is convenient for discharging concentrated water from the reverse osmosis membrane assemblies 42. The top of the water tank 6 is provided with a second water inlet 61, which is convenient for the clean water to enter the inside of the water tank. The bottom end of the water tank 6 is provided with a water outlet 62, which is convenient for discharging clean water.

[0030] Example 2

[0031] As shown in the figure, Figure 1 And Figure 2As shown, a saline water filtering device, including a pretreatment tank 1, the inside of the pretreatment tank 1 is provided with a filter screen 12, a quartz sand filter layer 13 and an activated carbon filter layer 14 from top to bottom in turn; the pretreatment tank 1 cooperates with the filter screen 12, the quartz sand filter layer 13 and the activated carbon filter layer 14 to facilitate the preliminary filtration of saline water, and facilitate the use of saline water; the aperture of the coarse filter screen is 2-5mm, the particle size of the quartz sand filter layer 13 is 0.5-2mm, and the particle size of the activated carbon filter layer 14 is 1-3mm. The bottom end of the pretreatment tank 1 is provided with a first pipeline 3, and the first pipeline 3 is connected with an intermediate water tank 2; the first pipeline 3 is convenient for guiding the pretreated water into the intermediate water tank 2. The intermediate water tank 2 is provided with a stirring assembly 21 for stirring the pretreated saline water; the water outlet end of the intermediate water tank 2 is connected with a reverse osmosis filter tank 4 through a second pipeline 5, and the reverse osmosis filter tank 4 is convenient for reverse osmosis filtration treatment of the stirred water in the intermediate water tank 2. A first booster pump 51 is arranged on the second pipeline 5; a second booster pump 101 is arranged on the second pipeline 5; the second booster pump 101 is convenient for pumping the water in the intermediate water tank 2 into the reverse osmosis filter tank 4. The bottom end of the reverse osmosis filter tank 4 is provided with a clean water outlet 44, and the clean water outlet 44 is connected with a clean water tank 6 through a third pipeline 7; the clean water outlet 44 cooperates with the third pipeline 7 to smoothly pour the purified water into the clean water tank 6 for storage.

[0032] As shown in the figure, Figure 2 The inside of the pretreatment tank 1 is provided with a limiting ring 11 along the bottom of the activated carbon filter layer 14, and the limiting ring 11 is convenient for limiting and supporting the filter screen 12, the quartz sand filter layer 13 and the activated carbon filter layer 14. The bottom edge of the pretreatment tank 1 is provided with a plurality of supporting legs 15, and the supporting legs 15 are convenient for supporting the pretreatment tank 1. The bottom of the supporting leg 15 is provided with a bottom ring 16, and the bottom ring 16 is uniformly provided with a plurality of bolt holes 161; the cooperation of the bottom ring 16 and the bolt hole 161 is convenient for fixing the position of the pretreatment tank 1 by bolts. The top opening of the pretreatment tank 1 is provided with a cover 17, and the bottom end of the cover 17 is provided with an adapter ring 171, and the adapter ring 171 is threadedly connected with the pretreatment tank 1; the cover 17 is convenient for disassembly and use. The top of the cover 17 is provided with a water inlet pipe 173 and a backflow joint 172, and the water inlet pipe 173 is convenient for connecting with a saline water supply pipeline.

[0033] As shown in the figure, Figure 3As shown, the top and bottom of the intermediate water tank 2 are provided with valves 22, which are convenient for cleaning the inside of the intermediate water tank 2 or adding medicine to the inside of the intermediate water tank 2. The top of the intermediate water tank 2 is provided with a bearing 23, which is convenient for the rotation of the stirring assembly 21. The top of the intermediate water tank 2 is provided with a water inlet connector 24 connected with the first pipeline 3. The bottom edge of the water tank is uniformly provided with a plurality of support rods 25, the bottom of the support rod 25 is provided with a support ring 27, and the support ring 27 is provided with a plurality of fixing holes 28. The support rod 25 cooperates with the support ring 27 and the fixing hole 28 to facilitate the position fixing of the intermediate water tank 2 by bolts. The bottom end of the intermediate water tank 2 is provided with a water outlet connector 26 connected with the second pipeline 5. The cooperation of the water outlet connector 26 and the second pipeline 5 facilitates the detachable connection between the intermediate water tank 2 and the second pipeline 5.

[0034] As shown in the figure, Figure 4 The stirring assembly 21 includes a stirring motor 212 and a stirring rod 211. The bottom end of the stirring rod 211 is provided with a plurality of stirring blades 2112, which are convenient for uniformly mixing the water in the intermediate water tank 2. The top end of the stirring rod 211 is interference connected with the bearing 23, which facilitates the rotation of the stirring rod 211. The top of the stirring rod 211 is provided with a driving slot 2111, and the output end of the stirring motor 212 is connected with the driving slot 2111 by plug-in connection, which facilitates the rotation of the stirring rod 211 driven by the stirring motor 212. One end of the stirring motor 212 abutting the intermediate water tank 2 is provided with a plurality of mounting feet 2121, which are convenient for fixing the position of the stirring motor 212 by bolts.

[0035] As shown in the figure, Figure 1 The top end of the reverse osmosis filter tank 4 is provided with a first water inlet 41. The reverse osmosis filter tank 4 is internally provided with a plurality of reverse osmosis membrane assemblies 42, which are spiral-wound reverse osmosis membranes. The reverse osmosis membrane assemblies 42 can effectively filter and treat saline water. The side bottom end of the reverse osmosis filter tank 4 is provided with a concentrated water outlet 43, which is convenient for discharging concentrated water from the reverse osmosis membrane assemblies 42. The top of the water tank 6 is provided with a second water inlet 61, which is convenient for the inlet of clean water into the water tank. The bottom end of the water tank 6 is provided with a water outlet 62, which is convenient for the outlet of clean water.

[0036] As shown in the figure, Figure 1As shown, it also includes a concentrated water tank 9, a fourth pipeline 8 and a fifth pipeline 10, the top end of the concentrated water tank 9 is provided with a third water inlet 91, the third water inlet 91 and the concentrated water outlet 43 are connected through the fourth pipeline 8, the top end of the concentrated water tank 9 is provided with a backflow port 92, and the bottom end of the concentrated water tank 9 is provided with a sewage outlet 93; after multiple filtrations, the sewage is discharged from the sewage outlet 93. The second booster pump 101 is arranged above the backflow port 92, the water suction end of the second booster pump 101 is provided with a water suction pipe 102, the water suction pipe 102 is connected with the backflow port 92, and the water discharge end of the second booster pump 101 is connected with the pretreatment tank 1 through the fifth pipeline 10; this structure is convenient for re-introducing the discharged concentrated water into the pretreatment tank, so as to facilitate the filtration treatment of the concentrated water again, ensure that all the clean water contained in the concentrated water is filtered out, and achieve the purpose of saving water resources.

[0037] Working principle: in use, the saline water supply pipeline is connected with the water inlet pipe 173, and the concentrated water tank 9 is connected with the backflow joint 172 of the pretreatment tank 1 through the fifth pipeline 10; after being pretreated by the pretreatment tank 1, the saline water enters the intermediate water tank 2, the stirring assembly 21 continuously stirs the water in the intermediate water tank 2, the stirred saline water enters the reverse osmosis tank, the saline water is purified after being filtered by the reverse osmosis membrane assembly 42, the purified saline water enters the clean water tank 6, and the waste water enters the concentrated water tank 9 through the concentrated water outlet 43 and is pumped into the pretreatment tank 1 for reprocessing under the action of the second booster pump 101.

[0038] To sum up, compared with the prior art, the pretreatment tank 1 is arranged, the saline water can be preliminarily pretreated through the pretreatment tank 1, the pretreated saline water enters the intermediate water tank 2, the filtration efficiency of the saline water can be improved through the stirring device of the intermediate water tank 2, and salt deposition is avoided; then the saline water is filtered by the reverse osmosis filter tank 4, and the filtered clean water enters the clean water tank 6, so that the purpose of effectively filtering the saline water is achieved.

[0039] The above is only a preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A saline water filtering device comprising a pre-treatment tank (1), characterized in that, The inside of the pretreatment tank (1) is sequentially provided with a filter screen (12), a quartz sand filter layer (13) and an activated carbon filter layer (14) from top to bottom; the bottom end of the pretreatment tank (1) is provided with a first pipeline (3), the first pipeline (3) is connected with an intermediate water tank (2), the intermediate water tank (2) is provided with a stirring assembly (21) for stirring the pretreated saline water; the water outlet end of the intermediate water tank (2) is connected with a reverse osmosis filter tank (4) through a second pipeline (5), the second pipeline (5) is provided with a first booster pump (51); the bottom end of the reverse osmosis filter tank (4) is provided with a clean water outlet (44), and the clean water outlet (44) is connected with a clean water tank (6) through a third pipeline (7).

2. The saline water filtering device according to claim 1, wherein, The inside of the pretreatment tank (1) is sequentially provided with a filter screen (12), a quartz sand filter layer (13) and an activated carbon filter layer (14) from top to bottom; the bottom end of the pretreatment tank (1) is provided with a first pipeline (3), the first pipeline (3) is connected with an intermediate water tank (2), the intermediate water tank (2) is provided with a stirring assembly (21) for stirring the pretreated saline water; the water outlet end of the intermediate water tank (2) is connected with a reverse osmosis filter tank (4) through a second pipeline (5), the second pipeline (5) is provided with a first booster pump (51); the bottom end of the reverse osmosis filter tank (4) is provided with a clean water outlet (44), and the clean water outlet (44) is connected with a clean water tank (6) through a third pipeline (7).

3. The device of claim 1, wherein, The top and bottom of the side surface of the intermediate water tank (2) are provided with valves (22), the top end of the intermediate water tank (2) is provided with a bearing (23), the top end of the intermediate water tank (2) is provided with a water inlet joint (24), the water inlet joint (24) is connected with the first pipeline (3), the bottom surface edge of the water tank is uniformly provided with a plurality of support rods (25), the bottom of the support rod (25) is provided with a support ring (27), the support ring (27) is provided with a plurality of fixing holes (28), the bottom end of the intermediate water tank (2) is provided with a drain joint (26), and the drain joint (26) is connected with the second pipeline (5).

4. The saline water filtering device of claim 3, wherein, The stirring assembly (21) comprises a stirring motor (212) and a stirring rod (211), the bottom end of the stirring rod (211) is provided with a plurality of stirring blades (2112), the top end of the stirring rod (211) is interference-connected with the bearing (23), the top of the stirring rod (211) is provided with a driving slot (2111), and the output end of the stirring motor (212) and the driving slot (2111) are connected in plug connection; one end of the stirring motor (212) abutting the intermediate water tank (2) is provided with a plurality of mounting feet (2121).

5. The device of claim 1, wherein, The top end of the reverse osmosis filter tank (4) is provided with a first water inlet (41), the inside of the reverse osmosis filter tank (4) is provided with a plurality of reverse osmosis membrane assemblies (42), the reverse osmosis membrane assembly (42) is a spiral-wound reverse osmosis membrane, and the bottom end of the side surface of the reverse osmosis filter tank (4) is provided with a concentrated water outlet (43).

6. A saline water filtering device as claimed in claim 5, wherein, The top of the clean water tank (6) is provided with a second water inlet (61), and the bottom end of the clean water tank (6) is provided with a water outlet (62).

7. A saline water filtering device as claimed in claim 5, wherein, The concentrated water tank (9) is provided with a third water inlet (91) at the top end, the third water inlet (91) and the concentrated water outlet (43) are connected through the fourth pipeline (8), the concentrated water tank (9) is provided with a backflow port (92) at the top end, and the concentrated water tank (9) is provided with a blowdown port (93) at the bottom end; the second booster pump (101) is arranged above the backflow port (92), the water suction end of the second booster pump (101) is provided with a water suction pipe (102), the water suction pipe (102) is connected with the backflow port (92), and the water discharge end of the second booster pump (101) is connected with the pretreatment tank (1) through the fifth pipeline (10).

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