Wastewater circulating treatment system

Abstract

The utility model discloses a wastewater circulation treatment system which comprises a circulation water tank, a first water inlet connected with a raw water input pipeline, and a second water inlet connected with a tap water input pipeline; a water outlet of the circulating water tank is connected with a water supply pipeline; the membrane component comprises a plurality of membrane elements; the water supply pipeline is communicated with the water outlet of the circulating water tank and the water inlet of the membrane component; the first concentrated water pipeline is communicated with the concentrated water outlet of the membrane component and the first water inlet of the circulating water tank; the water producing pipeline is communicated with the clear water outlet of the membrane component and the clear water tank; the second concentrated water pipeline is communicated with the first concentrated water pipeline and the water conveying pipeline; the third concentrated water pipeline is communicated with the second concentrated water pipeline and the concentrated water tank; the cleaning pipeline is communicated with the water production pipeline and the first water inlet of the circulating water tank. According to the utility model, different filtering modes can be used for filtering wastewater with different concentrations, oil substances in the wastewater can be separated and purified by combining the membrane component for filtering, the filtering effect is good, the efficiency is high, and the cleaning mode is also arranged, so that the cleaning is convenient.

Description

Technical Field

[0001] This utility model belongs to the field of filtration technology, specifically relating to a wastewater recycling system. Background Technology

[0002] Currently, most existing wastewater treatment methods rely on physical approaches, which are ineffective at separating and purifying oily substances and cannot filter dissolved pollutants. Furthermore, traditional wastewater treatment systems have a simple structure, often offering only one filtration mode, resulting in mediocre filtration performance and inconvenient cleaning. Therefore, a wastewater recycling system was designed to address these issues.

[0003] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this utility model and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this utility model. Utility Model Content

[0004] To overcome the shortcomings of the prior art, the purpose of this utility model is to provide a wastewater recycling treatment system.

[0005] To achieve the above and other related objectives, the technical solution provided by this utility model is: a wastewater recycling treatment system, comprising:

[0006] A circulating water tank has a first inlet connected to a raw water input pipe; raw water enters the circulating water tank from the raw water tank via the raw water input pipe. A second inlet of the circulating water tank is connected to a tap water input pipe (equipped with a valve); tap water enters the circulating water tank from the tap water tank via the tap water input pipe. The outlet of the circulating water tank is connected to a water supply pipe.

[0007] A membrane module, comprising a plurality of membrane elements;

[0008] A water supply pipe is provided, which connects the outlet of the circulating water tank and the inlet of the membrane module. A circulating pump and a first check valve are provided on the water supply pipe. The circulating pump is located on the side near the outlet of the circulating water tank, and the first check valve is located on the side near the inlet of the membrane module.

[0009] A first concentrate pipe is connected to the concentrate outlet of the membrane module and the first inlet of the circulating water tank. A first shut-off valve and a first valve are provided on the first concentrate pipe. The first shut-off valve is located on the side near the concentrate outlet of the membrane module, and the first valve is located on the side near the first inlet of the circulating water tank.

[0010] A water production pipeline is provided, which connects the clean water outlet of the membrane module and the clean water tank. A pressure reducing valve and a second valve are provided on the water production pipeline, with the second valve located on the side closer to the clean water tank.

[0011] A second concentrate pipeline connects the first concentrate pipeline and the water delivery pipeline. The second concentrate pipeline is equipped with a third valve, a fourth valve, and a second shut-off valve. The fourth valve is located at one end of the second concentrate pipeline near the first concentrate pipeline and is connected between the first valve and the first shut-off valve. The second shut-off valve is located at one end of the second concentrate pipeline near the water delivery pipeline and is connected between the circulating pump and the first check valve. The third valve is located between the second shut-off valve and the fourth valve.

[0012] The third concentrate pipeline connects the second concentrate pipeline and the concentrate tank, and the third concentrate pipeline is connected between the third valve and the fourth valve;

[0013] A cleaning pipe is provided, which connects the product water pipe and the first inlet of the circulating water tank. The cleaning pipe is connected between the clean water outlet of the membrane module and the pressure reducing valve. A fifth valve and a fourth shut-off valve are provided on the cleaning pipe. The fifth valve is located near the end of the product water pipe, and the fourth shut-off valve is located near the first inlet of the circulating water tank.

[0014] Furthermore, the membrane elements are connected in series. In this scheme, the series connection of multiple membrane elements allows the feed water to pass through multiple membrane elements sequentially, and the concentrate from each stage can be used as feed water for the next stage for further treatment, thereby reducing wastewater discharge and significantly improving the overall system recovery rate.

[0015] Furthermore, pressure gauges are installed on the series pipes of each membrane element. In this design, the pressure gauges can measure the inlet and outlet pressures of each membrane element, calculate the transmembrane pressure difference, and directly reflect the degree of membrane fouling or blockage. A sudden increase in pressure difference in a certain section may indicate that the membrane in that section needs to be cleaned or replaced.

[0016] Furthermore, each of the membrane elements is connected to the product water pipeline via a clean water pipeline. In this design, each membrane element is equipped with a clean water pipeline, which allows the water produced by each membrane element to be collected in the product water pipeline and then transported to the clean water tank.

[0017] Furthermore, each membrane element is equipped with a drain pipe, and each drain pipe is equipped with a drain valve. In this design, the drain pipes can be configured to drain liquid from individual membrane elements as needed.

[0018] Furthermore, the membrane within the membrane module is an inorganic ceramic membrane. In this design, the inorganic ceramic membrane exhibits strong corrosion resistance, tolerating strong acids, strong alkalis, organic solvents, and oxidants. It supports acid and alkali immersion, high-temperature steam, and strong oxidant cleaning, resulting in excellent flux recovery. Moreover, it is unaffected by bacterial or biofilm erosion, exhibits stable long-term performance, and provides high filtration accuracy.

[0019] Furthermore, an inlet filter is installed on the raw water input pipeline, and the inlet filter is connected to a drain pipe, which is equipped with a first normally open valve. In this design, the inlet filter allows for pre-treatment of the raw water before it enters the circulating water tank, filtering out some large particles of impurities.

[0020] Furthermore, a second check valve is installed on the raw water input pipeline, and the inlet filter is located between the raw water tank and the second check valve. In this design, the second check valve prevents raw water backflow.

[0021] Furthermore, the outlet of the circulating water tank is connected to a drain pipe, and a third shut-off valve and a drain valve are sequentially installed on the drain pipe along the drainage direction. In this design, the drain pipe can completely drain the remaining water from the circulating water tank for future use.

[0022] Furthermore, a detection pipe is installed on the circulating water tank, and a second normally open valve is installed on the detection pipe. The opening of the detection pipe faces upwards, and a liquid level detection instrument is installed at the outlet of the detection pipe. In this solution, the detection pipe and the liquid level detection instrument can monitor the liquid level in the circulating water tank.

[0023] Due to the application of the above technical solution, the beneficial effects of this utility model compared with the prior art are as follows:

[0024] The wastewater recycling system designed in this utility model can have different filtration modes to adapt to the filtration of wastewater of different concentrations. Combined with membrane modules, it can separate and purify oily substances in wastewater with good filtration effect and high efficiency. It also has a cleaning mode to facilitate system cleaning. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the wastewater recycling treatment system architecture of this utility model;

[0026] Figure 2 This is a schematic diagram of the wastewater recycling treatment system of this utility model. Figure 1 ;

[0027] Figure 3 This is a schematic diagram of the wastewater recycling treatment system of this utility model. Figure 2 ;

[0028] In the attached diagrams above, 1. Circulating water tank; 2. First inlet; 3. Second inlet; 4. Raw water input pipe; 5. Tap water input pipe; 6. Water delivery pipe; 7. Raw water tank; 8. Tap water tank; 9. Membrane module; 10. Membrane element; 11. Level sensor; 12. Outlet; 13. Circulating pump; 14. First check valve; 15. First concentrate pipe; 16. First shut-off valve; 17. First valve; 18. Product water pipe; 19. Clear water tank; 20. Pressure reducing valve; 21. Second valve; 22. Second concentrate pipe 23. Third valve; 24. Fourth valve; 25. Second shut-off valve; 26. Third concentrate pipeline; 27. Concentrate tank; 28. Cleaning pipeline; 29. ​​Pressure gauge; 30. Clean water pipeline; 31. Drainage pipeline; 32. Drainage valve; 33. Inlet filter; 34. Sewage pipeline; 35. First normally open valve; 36. Second check valve; 37. Drainage pipeline; 38. Third shut-off valve; 39. Drainage valve; 40. Detection pipeline; 41. Second normally open valve; 42. Fifth valve; 43. Fourth shut-off valve. Detailed Implementation

[0029] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0030] It should be noted that in the description of this utility model, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. These terms are used only for the convenience of describing this utility model and for 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. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. The terms "horizontal," "vertical," and "suspended," etc., do not indicate that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0033] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0034] Example:

[0035] See appendix Figure 1 Appendix Figure 2 and attached Figure 3 As shown, this embodiment provides a wastewater recycling treatment system, including:

[0036] A circulating water tank 1 has a first inlet 2 connected to a raw water input pipe 4. Raw water enters the circulating water tank 1 from the raw water tank 7 via the raw water input pipe 4. An inlet filter 33 is installed on the raw water input pipe 4, and a drain pipe 34 is connected to the inlet filter 33. A first normally open valve 35 is installed on the drain pipe 34. The inlet filter 33 pre-treats the raw water before it enters the circulating water tank 1, filtering out some large particles of impurities. A second check valve 36 is installed on the raw water input pipe 4, and the inlet filter 33 is positioned between the raw water tank 7 and the second check valve 36. The second check valve 36 prevents raw water backflow.

[0037] The second inlet 3 of the circulating water tank 1 is connected to a tap water inlet pipe 5 (a valve is installed on the tap water inlet pipe 5); tap water is introduced into the circulating water tank 1 from the tap water tank 8 through the tap water inlet pipe 5.

[0038] The outlet 12 of the circulating water tank 1 is connected to a water supply pipe 6; the outlet 12 of the circulating water tank 1 is also connected to a drain pipe 37, on which a third shut-off valve 38 and a drain valve 39 are sequentially installed along the drain direction; the drain pipe 37 is designed to drain the remaining water in the circulating water tank 1 for future use. A detection pipe 40 is installed on the circulating water tank 1, and a second normally open valve 41 is installed on the detection pipe 40. The opening of the detection pipe 40 faces upwards, and a level detection instrument 11 is installed at the outlet 12 of the detection pipe 40. The detection pipe 40 and the level detection instrument 11 are designed to monitor the level of the liquid in the circulating water tank 1.

[0039] Membrane module 9 comprises several membrane elements 10, which are connected in series. This series connection allows feed water to pass through multiple membrane elements 10 sequentially, with the concentrate from each stage serving as feed water for further treatment, thus reducing wastewater discharge and significantly improving the overall system recovery rate. Each membrane element 10 is equipped with a pressure gauge 29 on its series connection pipe. The pressure gauge 29 measures the inlet and outlet pressures of each membrane element 10, calculating the transmembrane pressure difference, which directly reflects the degree of membrane fouling or blockage. A sudden increase in pressure difference in a certain section may indicate that the membrane section needs cleaning or replacement. Each membrane element 10 is connected to a product water pipe 18 via a clean water pipe 30. The clean water pipe 30 collects the water produced by each membrane element 10 and collects it in the product water pipe 18 before transporting it to the clean water tank 19. Each membrane element 10 is equipped with a drain pipe 31, and each drain pipe 31 is equipped with a drain valve 32. The drainage pipe 31 can drain liquid from individual membrane elements 10 as needed.

[0040] The membrane in membrane module 9 is made of inorganic ceramic. Inorganic ceramic membranes are highly corrosion-resistant and can withstand strong acids, strong alkalis, organic solvents, and oxidants. They support acid and alkali immersion, high-temperature steam, and strong oxidant cleaning, and have good flux recovery performance. Moreover, they are not affected by bacteria or biofilm erosion, maintain stable long-term performance, and have high filtration accuracy. Membrane element 10 is made of inorganic ceramic composite material, mainly composed of yttrium oxide, lanthanum oxide, and zirconium oxide, which can better withstand acid and alkali cleaning without being affected.

[0041] Water supply pipe 6 connects the outlet 12 of the circulating water tank 1 and the inlet of the membrane module 9. A circulating pump 13 and a first check valve 14 are installed on the water supply pipe 6. The circulating pump 13 is installed on the side near the outlet 12 of the circulating water tank 1, and the first check valve 14 is installed on the side near the inlet of the membrane module 9.

[0042] The first concentrate pipe 15 connects the concentrate outlet of the membrane module 9 and the first inlet 2 of the circulating water tank 1. The first concentrate pipe 15 is equipped with a first shut-off valve 16 and a first valve 17. The first shut-off valve 16 is located on the side closer to the concentrate outlet of the membrane module 9, and the first valve 17 is located on the side closer to the first inlet 2 of the circulating water tank 1.

[0043] The water production pipeline 18 connects the clean water outlet of the membrane module 9 and the clean water tank 19. A pressure reducing valve 20 and a second valve 21 are installed on the water production pipeline 18. The second valve 21 is located on the side close to the clean water tank 19.

[0044] The second concentrate pipeline 22 connects the first concentrate pipeline 15 and the water supply pipeline 6. The second concentrate pipeline 22 is equipped with a third valve 23, a fourth valve 24, and a second shut-off valve 25. The fourth valve 24 is located at the end of the second concentrate pipeline 22 closest to the first concentrate pipeline 15 and connects between the first valve 17 and the first shut-off valve 16. The second shut-off valve 25 is located at the end of the second concentrate pipeline 22 closest to the water supply pipeline 6 and connects between the circulating pump 13 and the first check valve 14. The third valve 23 is located between the second shut-off valve 25 and the fourth valve 24.

[0045] The third concentrate pipe 26 connects the second concentrate pipe 22 and the concentrate tank 27, and the third concentrate pipe 26 is connected between the third valve 23 and the fourth valve 24.

[0046] Cleaning pipe 28 connects the product water pipe 18 and the first inlet 2 of the circulating water tank 1. Cleaning pipe 28 is connected between the clean water outlet of the membrane module 9 and the pressure reducing valve 20. A fifth valve 42 and a fourth shut-off valve 43 are installed on the cleaning pipe 28. The fifth valve 42 is located near the end of the product water pipe 18, and the fourth shut-off valve 43 is located near the first inlet 2 of the circulating water tank 1.

[0047] Among them, the valves can be, but are not limited to, electric ball valves or gate valves. The valves only need to meet the control requirements of the corresponding pipeline. Electric valves are easy to connect to the control system and convenient to control the opening and closing time of the valves. Timed pulse opening and closing can be used.

[0048] This embodiment can have three modes:

[0049] Primary filtration mode: Open the second valve 21, and turn on the circulation pump 13 after 3 seconds. Open the first valve 17 for 30 seconds every 30 minutes (time adjustable). After a cumulative time of 4 hours (time adjustable), open the fourth valve 24 for 5 seconds (time adjustable).

[0050] At this time, the raw water from raw water tank 7 enters circulating water tank 1 through inlet filter 33, and then enters membrane module 9 through circulating pump 13. The clean water produced by membrane module 9 enters the product water tank through product water pipe 18. The concentrated water filtered by membrane module 9 is returned through the first concentrated water pipe 15. Every 30 minutes, the first valve 17 is opened for 30 seconds to allow the concentrated water to return to circulating water tank 1 for circulation filtration. After a cumulative time of 4 hours, the fourth valve 24 is opened for 5 seconds to allow the concentrated water to enter concentrated water tank 27 through the third concentrated water pipe 26. The primary filtration mode is used when the raw water quality is good. It adopts a dead-end filtration operation mode. During operation, the concentrated water valve is closed, and only clean water is produced. After a period of operation, a portion of the concentrated water is discharged.

[0051] Advanced filtration mode: Open the first valve 17 and the second valve 21, turn on the circulation pump 13 after 3 seconds, open the fourth valve 24 every 4 hours (time adjustable), and close the first valve 17 for 5 seconds (time adjustable).

[0052] At this time, the raw water from raw water tank 7 enters circulating water tank 1 through inlet filter 33, and then enters membrane module 9 through circulating pump 13. The clean water produced by membrane module 9 enters the product water tank through product water pipe 18. The concentrate filtered by membrane module 9 flows back to circulating water tank 1 through first concentrate pipe 15 for circulation filtration. After a cumulative time of 4 hours, the fourth valve 24 is opened and the first valve 17 is closed for 5 seconds, allowing water to enter concentrate tank 27 through third concentrate pipe 26. The advanced filtration mode is used when the raw water quality is poor. It adopts a cross-flow filtration operation mode. During operation, the concentrate continuously circulates in the system pipeline. The surface of membrane element 10 is reduced from the risk of clogging due to continuous water flow. After a period of operation, a portion of the concentrate is discharged.

[0053] Cleaning mode: Manually add chemicals to circulating water tank 1, open the first valve 17 and the fifth valve 42, turn on the circulating pump 13 after 3 seconds, and turn on the third valve 23 to the set low liquid level after 60 minutes (time can be adjusted).

[0054] At this time, clean water from tap water tank 8 enters circulating water tank 1, then flows through circulating pump 13 into membrane module 9. Clean water produced by membrane module 9 flows through product water pipe 18 into cleaning pipe 28 and then back to circulating water tank 1. Water filtered by membrane module 9 flows back to circulating water tank 1 through first concentrate pipe 15 for circulating cleaning. After 60 minutes, the third valve 23 is opened, and water in circulating water tank 1 flows through second concentrate pipe 22 to third concentrate pipe 26 and then into concentrate tank 27 for discharge. After the equipment has been running for a period of time, chemicals are added to circulating water tank 1 to execute the cleaning process. After the chemicals circulate and clean, the cleaning water is automatically discharged, completing the cleaning process.

[0055] This system uses a combination of pulse filtration and dead-end filtration. During filtration, the concentrate return valve is opened and closed in a timed pulse manner, which can achieve a high recovery rate of dead-end filtration and alleviate the clogging of the membrane surface. Different filtration modes are suitable for filtering wastewater of different concentrations.

[0056] The wastewater recycling system designed in this utility model can have different filtration modes to adapt to the filtration of wastewater of different concentrations. Combined with the membrane module 9 for filtration, it can separate and purify oily substances in wastewater with good filtration effect and high efficiency. It also has a cleaning mode to facilitate system cleaning.

[0057] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They cannot be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A wastewater recycling treatment system, characterized in that, include: A circulating water tank (1) has a first inlet (2) connected to a raw water input pipe (4), through which raw water is input from the raw water tank (7) into the circulating water tank (1); a second inlet (3) of the circulating water tank (1) is connected to a tap water input pipe (5); and a water outlet (12) of the circulating water tank (1) is connected to a water delivery pipe (6). Membrane module (9), the membrane module (9) includes a plurality of membrane elements (10); Water supply pipe (6) is connected to the outlet (12) of the circulating water tank (1) and the inlet of the membrane module (9). A circulating pump (13) and a first check valve (14) are provided on the water supply pipe (6). The circulating pump (13) is located on the side near the outlet (12) of the circulating water tank (1), and the first check valve (14) is located on the side near the inlet of the membrane module (9). The first concentrate pipe (15) connects the concentrate outlet of the membrane module (9) and the first inlet (2) of the circulating water tank (1). The first concentrate pipe (15) is provided with a first shut-off valve (16) and a first valve (17). The first shut-off valve (16) is located on the side near the concentrate outlet of the membrane module (9), and the first valve (17) is located on the side near the first inlet (2) of the circulating water tank (1). A water production pipeline (18) is provided, which connects the clean water outlet of the membrane module (9) and the clean water tank (19). A pressure reducing valve (20) and a second valve (21) are provided on the water production pipeline (18), and the second valve (21) is provided on the side close to the clean water tank (19). The second concentrated water pipeline (22) connects the first concentrated water pipeline (15) and the water supply pipeline (6). The second concentrated water pipeline (22) is equipped with a third valve (23), a fourth valve (24), and a second shut-off valve (25). The fourth valve (24) is located at one end of the second concentrated water pipeline (22) near the first concentrated water pipeline (15) and is connected between the first valve (17) and the first shut-off valve (16). The second shut-off valve (25) is located at one end of the second concentrated water pipeline (22) near the water supply pipeline (6) and is connected between the circulating pump (13) and the first check valve (14). The third valve (23) is located between the second shut-off valve (25) and the fourth valve (24). The third concentrate pipe (26) connects the second concentrate pipe (22) and the concentrate tank (27), and the third concentrate pipe (26) is connected between the third valve (23) and the fourth valve (24); A cleaning pipe (28) is provided, which connects the product water pipe (18) and the first inlet (2) of the circulating water tank (1). The cleaning pipe (28) is connected between the clean water outlet of the membrane module (9) and the pressure reducing valve (20). A fifth valve (42) and a fourth shut-off valve (43) are provided on the cleaning pipe (28). The fifth valve (42) is located near one end of the product water pipe (18), and the fourth shut-off valve (43) is located near the first inlet (2) of the circulating water tank (1).

2. The wastewater recycling treatment system according to claim 1, characterized in that: Each of the membrane elements (10) is arranged in series.

3. The wastewater recycling treatment system according to claim 2, characterized in that: Pressure gauges (29) are installed on the series pipes of each of the membrane elements (10).

4. The wastewater recycling treatment system according to claim 1, characterized in that: Each of the membrane elements (10) is connected to the product water pipe (18) via a clean water pipe (30).

5. The wastewater recycling treatment system according to claim 1, characterized in that: Each of the membrane elements (10) is provided with a drain pipe (31), and each drain pipe (31) is provided with a drain valve (32).

6. The wastewater recycling treatment system according to claim 1, characterized in that: The membrane in the membrane module (9) is an inorganic ceramic membrane.

7. The wastewater recycling treatment system according to claim 1, characterized in that: The raw water input pipe (4) is equipped with an inlet filter (33), the inlet filter (33) is equipped with a sewage discharge pipe (34), and the sewage discharge pipe (34) is equipped with a first normally open valve (35).

8. A wastewater recycling treatment system according to claim 7, characterized in that: A second check valve (36) is installed on the raw water input pipeline (4), and the inlet filter (33) is installed between the raw water tank (7) and the second check valve (36).

9. A wastewater recycling treatment system according to claim 1, characterized in that: The outlet (12) of the circulating water tank (1) is also connected to a drainage pipe (37), and a third shut-off valve (38) and a drainage valve (39) are sequentially arranged on the drainage pipe (37) along the drainage direction.

10. A wastewater recycling treatment system according to claim 1, characterized in that: The circulating water tank (1) is provided with a detection pipe (40), and a second normally open valve (41) is provided on the detection pipe (40). The opening of the detection pipe (40) is facing upward, and a liquid level detection instrument (11) is provided at the outlet (12) of the detection pipe (40).

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