A purification and recycling device for industrial wastewater

Abstract

The present invention discloses a purification and recycling device for industrial wastewater, which includes a primary filtration device, a first water pump, a re-filtration device, a recycling device, and a second water pump. The first water pump inputs sewage into the primary filtration device, and the primary filtration device outputs preliminarily filtered water to the recycling device. The re-filtration device includes a re-filtration assembly, a purified water outlet pipeline, and a re-filtered water outlet pipeline. The re-filtered water outlet pipeline is communicated with the recycling device. The recycling device includes: a recycling tank, the upper part of the recycling tank is provided with a sewage inlet pipeline communicated with the primary filtration device, and the bottom of the recycling tank is provided with a recycled water outlet pipeline; a second water pump for outputting purified water; a positive flushing water tank for outputting positive flushing water to the re-filtration assembly; and a control device for realizing separation of purified water and waste sewage without the need to remove the filter element for cleaning.

Description

Technical Field

[0001] The present invention relates to the technical field of water purification and recycling equipment, and particularly relates to a purification and recycling equipment for industrial wastewater. Background Art

[0002] At present, water pollution is becoming increasingly serious, especially industrial wastewater, which contains a large amount of metal solutes and sludge. If it is directly discharged without purification, it will lead to aggravated water pollution.

[0003] Most of the sewage purification devices on the market use multiple filter elements to filter multiple times to achieve the effect of purifying industrial wastewater. After working for a period of time, waste and dirt such as metals and sludge accumulate in the filter elements, affecting the normal use of the filter elements and the water purification effect. Moreover, the filter elements are installed in multiple stages inside the water purification equipment, making it inconvenient to disassemble, clean, and replace. Therefore, the existing sewage purification devices usually have a separate circulation system for flushing the filter elements. However, this kind of circulation system is started after a large amount of sludge and metal waste accumulate in the filter elements, which cannot guarantee the cleaning effect of the filter elements, and the intermittent output of purified water to clean the filter elements affects the purification efficiency of industrial wastewater. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a purification and recycling equipment for industrial wastewater, which improves the cleaning effect of the filter elements and the purification efficiency of industrial wastewater.

[0005] The above technical purpose of the present invention is achieved through the following technical solutions: A purification and recycling equipment for industrial wastewater includes a primary filtration device, a first water pump, a re-filtration device, a circulation device, and a second water pump. The first water pump inputs sewage to the primary filtration device, and the primary filtration device outputs primary filtered water to the circulation device. The re-filtration device includes a re-filtration component, a purified water outlet pipeline, and a re-filtered water outlet pipeline. The re-filtered water outlet pipeline is communicated with the circulation device;

[0006] The circulation device includes:

[0007] A circulation tank, the upper part of the circulation tank is provided with a sewage inlet pipeline communicated with the primary filtration device, and the bottom of the circulation tank is provided with a circulating water outlet pipeline;

[0008] A second water pump, the second water pump outputs circulating water to circulate between the re-filtration device and the circulation device and finally outputs purified water from the purified water outlet pipeline;

[0009] A positive flushing water tank, the purified water outlet pipeline outputs a part of the purified water to the positive flushing water tank, the positive flushing water tank outputs positive flushing water to the re-filtration component through the second water pump, and the re-filtration component outputs the positive flushing water into the circulation tank;

[0010] A control device, which controls the opening or closing of the purified water outlet pipeline, the re-filtered water outlet pipeline, and the circulating water outlet pipeline when the positive flushing water tank outputs.

[0011] Furthermore, the circulating device further includes an air flushing tank, which outputs gas and passes through the re-filtering device and the circulating tank. Through the above improvement, when the re-filtering component is being cleaned, the air flushing tank flushes the remaining water and residual waste in the purified water outlet pipeline into the circulating tank.

[0012] Furthermore, the primary filtering device includes a magnetic filtering cylinder and a filter screen cylinder that are interconnected. The filter screen cylinder is connected to the circulating tank, and sewage outlets are respectively provided on the filter screen cylinder and the magnetic filtering cylinder. Through the above improvement, the magnetic filtering barrel and the filter screen cylinder can discharge sewage separately, increasing the primary filtering effect on sewage.

[0013] Furthermore, a third water pump is connected to the bottom of the circulating tank. The third water pump is used to discharge the concentrated sewage at the bottom of the circulating tank. A pressure transmitter for measuring the density of the waste volume inside it is provided at the bottom of the circulating tank, so that after the waste in the circulating tank reaches a certain concentration, it is discharged through the third water pump.

[0014] Furthermore, the control device includes a first high-level gauge and a first low-level gauge disposed in the circulating tank. The first high-level gauge is used to control the first water pump to stop working, and the first low-level gauge is used to control the first water pump to open. The control device controls the first water pump to stop the inflow of sewage during the operation of the positive flushing water tank and the air flushing water tank, that is, during positive flushing;

[0015] The control device includes a second high-level gauge and a second low-level gauge disposed in the positive flushing water tank. The second high-level gauge is used to close the connection between the purified water outlet pipeline and the positive flushing water tank, and the second low-level gauge is used to open the connection between the purified water outlet pipeline and the positive flushing water tank, so that a part of the purified water is output to the positive flushing water tank through the purified water outlet pipeline. The control device controls the positive flushing tank to stop water inflow during positive flushing.

[0016] Furthermore, the positive flushing water tank is connected to the tap water pipeline until the water level in the positive flushing water tank reaches the second high-level gauge. Through the above improvement, when the system is idling, tap water is input to clean the inside of the system, and tap water is replenished when the water level in the positive flushing water tank is insufficient, thereby controlling the flow rate of the positive flushing water and the frequency of positive flushing.

[0017] Furthermore, the re-filtering component includes at least one first ceramic membrane filtering group and at least one second ceramic membrane filtering group. The tops of the first ceramic membrane filtering group and the second ceramic membrane filtering group are connected, and the first ceramic membrane filtering group is connected to the circulating water outlet pipeline, and the second ceramic membrane filtering group is connected to the re-filtered water outlet pipeline and the positive flushing water tank;

[0018] During cyclic filtration, the circulating water outlet pipe outputs circulating water to the first ceramic membrane filtration group. The circulating water goes from the bottom of the first ceramic membrane filtration group to the top of the second ceramic membrane filtration group, and then enters the circulation tank from the bottom of the second ceramic membrane filtration group through the re-filtered water outlet pipe.

[0019] During normal flushing, the normal flushing water tank outputs purified water to the first ceramic membrane filtration group. The normal flushing water goes from the bottom of the first ceramic membrane filtration group to the top of the second ceramic membrane filtration group, and then enters the circulation tank from the bottom of the second ceramic membrane filtration group through the re-filtered water outlet pipe, or returns to the normal flushing water tank through the purified water outlet pipe.

[0020] A purification and circulation method for an industrial wastewater purification and circulation device includes the following steps:

[0021] A. Preliminary filtration: When the water level in the circulation tank is lower than the first low liquid level gauge, the first water pump works, outputs sewage and passes through the magnetic filtration cylinder and the filter mesh cylinder in sequence.

[0022] B. Sewage circulation: The initially filtered water is input into the circulation tank until the water level in the circulation tank reaches the first high liquid level gauge. The second water pump outputs the circulating water in the circulation tank to the re-filtering component. The purified water passing through the re-filtering component is discharged through the purified water outlet pipe, and the re-filtered water passing through the re-filtering component returns to the circulation tank through the re-filtered water outlet pipe.

[0023] C. Normal flushing: c1 The sewage inlet, the purified water outlet pipe and the circulating water outlet pipe are closed. The second water pump works and outputs the purified water in the normal flushing water tank to the re-filtering component to press the sewage in the re-filtering component into the circulation tank through the re-filtered water outlet pipe.

[0024] c2 The re-filtered water outlet pipe remains open for n seconds and then closes, and the purified water outlet pipe opens and is connected to the normal flushing water tank to clean the re-filtering component.

[0025] c3 The purified water outlet pipe remains open for m seconds and then is disconnected from the normal flushing water tank, and the re-filtered water outlet pipe opens to input all the normal flushing water into the circulation tank.

[0026] D. Return to step B, continuously circulate to discharge purified water, and when the sewage in the circulation tank reaches a certain concentration, the third water pump discharges the concentrated sewage at the bottom of the circulation tank.

[0027] Furthermore, in step B, it also includes replenishing water to the normal flushing water tank: When the water level in the normal flushing water tank is lower than the second low liquid level gauge, the purified water outlet pipe is connected to the normal flushing water tank and inputs part of the purified water into it, and the normal flushing water tank is connected to the tap water pipe to supplement purified water until the water level in the normal flushing water tank reaches the second high liquid level gauge.

[0028] Furthermore, in step c1, it also includes air flushing: The air flushing tank outputs gas to the purified water outlet pipe and enters the re-filtering component.

[0029] Compared with the prior art, the present invention has the following advantages and beneficial effects: The sewage is first preliminarily filtered through the magnetic filter cylinder and the filter screen cylinder, and sewage outlets are provided at the bottoms of both the magnetic filter cylinder and the filter screen cylinder, thus ensuring the filtering effect of the primary filtering device;

[0030] The water pressure after primary filtration is pressed into the circulation tank. When the liquid level in the circulation tank reaches the set height, the sewage stops flowing in, thereby limiting the total amount of the solvent. At the same time, the waste solute precipitates at the bottom of the circulation tank. The second water pump transports the circulating water in the circulation tank to the re-filtering assembly for secondary filtration. Part of the purified water is output to the positive flushing water tank through the purified water outlet pipeline, and the other part of the purified water is discharged. The remaining sewage returns to the circulation tank after passing through the re-filtering device, increasing the proportion of the waste solvent precipitated at the bottom of the circulation tank;

[0031] After filtering for a period of time, the control device controls the circulation tank to stop discharging water, and the positive flushing water tank outputs purified water to flush the re-filtering assembly forward to clean the filtering waste in the ceramic membrane filter group and output the filtering waste to the circulation tank to ensure the purified water effect of the re-filtering device;

[0032] After the filtering waste in the re-filtering assembly is discharged, the connection between the re-filtering assembly and the circulation tank is closed, and continuous circulation of water inlet and outlet occurs between the positive flushing water tank and the re-filtering assembly to further increase the cleaning effect on the re-filtering assembly. After a period of time, the re-filtering assembly is connected to the circulation tank, and the connection between the re-filtering assembly and the positive flushing water tank is closed. The positive flushing water is all output to the circulation tank through the re-filtering assembly, and a new cycle of filtration starts between the circulation tank and the re-filtering assembly, so that while the positive flushing water tank flushes the re-filtering assembly, a third filtration effect is achieved, causing the waste solvent to finally accumulate in the circulation tank, and the purified water is discharged through the purified water outlet pipeline. When the sewage in the circulation tank reaches a certain concentration, the sewage is discharged through the third water pump to achieve separation of purified water and waste, and there is no need to remove the filter element for cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 is another schematic diagram of the overall structure of the present invention;

[0035] Figure 3 is a flowchart of primary filtration, re-filtering and circulation of the present invention

[0036] Figure 4 is a flowchart of positive flushing and air flushing of the present invention;

[0037] Figure 5 is a schematic connection diagram of the re-filtering assembly, the circulation tank and the positive flushing water tank of the present invention;

[0038] In the figure: 1. First water pump; 2. Second water pump; 3. Re-filtering component; 3.1 First ceramic membrane filtration group; 3.2 Second ceramic membrane filtration group; 4. Clean water outlet pipeline; 5. Re-filtered water outlet pipeline; 6. Circulation tank; 6.1 Sewage inlet pipeline; 6.2 Circulating water outlet pipeline; 6.3 First high liquid level gauge; 6.4 First low liquid level gauge; 7. Positive flushing water tank; 7.1 Second high liquid level gauge; 7.2 Second low liquid level gauge; 8. Air flushing tank; 9. Magnetic filtration cylinder; 10. Filter screen cylinder; 11. Sewage outlet; 12. Third water pump; 13. Sewage storage tank; 14. Sewage output tank; 15. Clean water storage tank; Detailed implementation mode

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0040] It should be understood that although the terms upper, middle, lower, top, one end, etc. appear in this text to describe various components, these components are not limited by these terms. These terms are only used to distinguish the components from each other for easy understanding, rather than to define any directional or sequential limitations.

[0041] As Figures 1-5 shown, a purification and circulation device for industrial wastewater includes a primary filtration device, a first water pump 1, a re-filtering device, a circulation device, and a second water pump 2. The first water pump 1 inputs sewage to the primary filtration device, and the primary filtration device outputs primary filtered water to the circulation device. The re-filtering device includes a re-filtering component 3, a clean water outlet pipeline 4, and a re-filtered water outlet pipeline 5. The re-filtered water outlet pipeline 5 is communicated with the circulation device, and a flow meter is also provided in the clean water outlet pipeline 4;

[0042] The circulation device includes:

[0043] A circulation tank 6, the upper part of the circulation tank 6 is provided with a sewage inlet pipeline 6.1 communicated with the primary filtration device, and the bottom of the circulation tank 6 is provided with a circulating water outlet pipeline 6.2;

[0044] A second water pump 2, the second water pump 2 outputs circulating water to circulate between the re-filtering device and the circulation device and finally outputs clean water from the clean water outlet pipeline 4;

[0045] A positive flushing water tank 7, a part of the clean water output from the clean water outlet pipeline 4 is output to the positive flushing water tank 7. The positive flushing water tank 7 outputs positive flushing water to the re-filtering component 3 through the second water pump 2, and the re-filtering component 3 outputs the positive flushing water into the circulation tank 6;

[0046] A control device, which controls the opening or closing of the purified water outlet pipeline 4, the re-filtered water outlet pipeline 5, and the circulating water outlet pipeline 6.2 when the positive flushing water tank 7 outputs, and the control device also controls the positive flushing water tank 7 and the air flushing tank 8 to be periodically opened.

[0047] Specifically, the circulating device further includes an air flushing tank 8, which outputs gas and passes through the re-filtering device and the circulating tank 6. When the re-filtering assembly 3 is being cleaned, the air flushing tank 8 flushes the remaining water and residual waste in the purified water outlet pipeline 4 into the circulating tank 6.

[0048] Specifically, the primary filtering device includes a magnetic filtering cylinder 9 and a filter screen cylinder 10 that are interconnected. The filter screen cylinder 10 is connected to the circulating tank 6, and sewage outlets 11 are respectively provided on the filter screen cylinder 10 and the magnetic filtering cylinder 9. The magnetic filtering barrel and the filter screen cylinder 10 can discharge sewage separately, increasing the primary filtering effect on sewage.

[0049] Specifically, a third water pump 12 is connected to the bottom of the circulating tank 6. The third water pump 12 is used to discharge the concentrated sewage at the bottom of the circulating tank 6. A pressure transmitter for measuring the density of the waste capacity inside it is provided at the bottom of the circulating tank 6, so that after the waste in the circulating tank 6 reaches a certain concentration, it is discharged through the third water pump 12.

[0050] Specifically, the control device includes a first high-level gauge 6.3 and a first low-level gauge 6.4 provided in the circulating tank 6. The first high-level gauge 6.3 is used to control the first water pump 1 to stop working, and the first low-level gauge 6.4 is used to control the first water pump 1 to open. The control device controls the first water pump 1 to stop receiving sewage during the positive flushing of the positive flushing water tank 7 and the air flushing water tank;

[0051] The control device includes a second high-level gauge 7.1 and a second low-level gauge 7.2 provided in the positive flushing water tank 7. The second high-level gauge 7.1 is used to close the connection between the purified water outlet pipeline 4 and the positive flushing water tank 7, and the second low-level gauge 7.2 is used to open the connection between the purified water outlet pipeline and the positive flushing water tank 7, so that a part of the purified water is output to the positive flushing water tank 7 through the purified water outlet pipeline. The control device controls the positive flushing tank to stop receiving water during positive flushing.

[0052] Specifically, the positive flushing water tank 7 is connected to the tap water pipeline until the water level in the positive flushing water tank 7 reaches the second high-level gauge 7.1. When the system is idling, tap water is input to clean the inside of the system, and tap water is replenished when the water level in the positive flushing water tank 7 is insufficient, thereby controlling the flow rate of the positive flushing water and the frequency of positive flushing.

[0053] Specifically, the re-filtering component 3 includes at least one first ceramic membrane filtering group 3.1 and at least one second ceramic membrane filtering group 3.2. The tops of the first ceramic membrane filtering group 3.1 and the second ceramic membrane filtering group 3.2 are connected. The first ceramic membrane filtering group 3.1 is connected to the circulating water outlet pipeline 6.2, and the second ceramic membrane filtering group 3.2 is connected to the re-filtered water outlet pipeline 5 and the positive flushing water tank 7.

[0054] During circulating filtration, the circulating water outlet pipeline 6.2 outputs circulating water to the first ceramic membrane filtering group 3.1. The circulating water goes from the bottom of the first ceramic membrane filtering group 3.1 to the top of the second ceramic membrane filtering group 3.2, and then from the bottom of the second ceramic membrane filtering group 3.2 enters the circulation tank 6 through the re-filtered water outlet pipeline 5.

[0055] During positive flushing, the positive flushing water tank 7 outputs purified water to the first ceramic membrane filtering group 3.1. The positive flushing water goes from the bottom of the first ceramic membrane filtering group 3.1 to the top of the second ceramic membrane filtering group 3.2, and then from the bottom of the second ceramic membrane filtering group 3.2 enters the circulation tank 6 through the re-filtered water outlet pipeline 5, or returns to the positive flushing water tank 7 through the purified water outlet pipeline 4.

[0056] A purification and circulation method for a purification and circulation device of industrial wastewater includes the following steps:

[0057] A. Preliminary filtration: When the water level in the circulation tank 6 is lower than the first low liquid level gauge 6.4, the first water pump 1 operates to output sewage from the sewage output tank 14 and sequentially pass through the magnetic filtration cylinder 9 and the filter screen cylinder 10.

[0058] B. Sewage circulation: The initially filtered water is input into the circulation tank 6 until the water level in the circulation tank 6 reaches the first high liquid level gauge 6.3. The second water pump 2 outputs the circulating water in the circulation tank 6 to the re-filtering component 3. The purified water passing through the re-filtering component 3 is discharged to the purified water storage tank 15 through the purified water outlet pipeline 4, and the re-filtered water passing through the re-filtering component 3 returns to the circulation tank 6 through the re-filtered water outlet pipeline 5.

[0059] C. Positive flushing: c1 The sewage inlet, the purified water outlet pipeline 4, and the circulating water outlet pipeline 6.2 are closed. The second water pump 2 operates and outputs the purified water in the positive flushing water tank 7 to the re-filtering component 3 to press the sewage in the re-filtering component 3 into the circulation tank 6 through the re-filtered water outlet pipeline 5.

[0060] c2 The re-filtered water outlet pipeline 5 is continuously opened for n seconds and then closed, and the purified water outlet pipeline 4 is opened and communicated with the positive flushing water tank 7 to clean the re-filtering component 3.

[0061] c3 The purified water outlet pipeline 4 is continuously opened for m seconds and then closed and communicated with the positive flushing water tank 7, and the re-filtered water outlet pipeline 5 is opened, and all the positive flushing water has been input into the circulation tank 6, where n = 5 and m = 30.

[0062] D. Return to step B, continuously circulate to produce purified water, and after the sewage in the circulation tank 6 reaches a certain concentration, the third water pump 12 discharges the concentrated sewage at the bottom of the circulation tank 6 to the sewage storage tank 13.

[0063] Specifically, in step B, it also includes replenishing water to the positive flushing water tank 7: when the water level in the positive flushing water tank 7 is lower than the second low liquid level gauge 7.2, the purified water outlet pipeline 4 is connected to the positive flushing water tank 7 and part of the purified water is input into it, and the positive flushing water tank 7 is connected to the tap water pipeline and replenishes purified water until the water level in the positive flushing water tank 7 reaches the second high liquid level gauge 7.1.

[0064] Specifically, in step c1, it also includes air flushing: the air flushing tank 8 outputs gas to the purified water outlet pipeline 4 and enters the re-filtering assembly 3.

[0065] The sewage is first preliminarily filtered through the magnetic filtration cylinder 9 and the filter mesh cylinder 10, and sewage outlets 11 are provided at the bottoms of both the magnetic filtration cylinder 9 and the filter mesh cylinder 10, so as to ensure the filtering effect of the primary filtering device;

[0066] The primary filtered water pressure is introduced into the circulation tank 6. When the liquid level height of the circulation tank 6 reaches the set value, the sewage stops entering, thereby limiting the total amount of the solvent. At the same time, the waste solute precipitates at the bottom of the circulation tank 6. The second water pump 2 transports the circulating water in the circulation tank 6 to the re-filtering assembly 3 for secondary filtering. Part of the purified water is output to the positive flushing water tank 7 through the purified water outlet pipeline 4, and the other part of the purified water is discharged. The remaining sewage returns to the circulation tank 6 after passing through the re-filtering device, increasing the proportion of the waste solvent precipitated at the bottom of the circulation tank 6;

[0067] After filtering for a period of time, the control device controls the circulation tank 6 to stop discharging water. The positive flushing water tank 7 outputs purified water to positively flush the re-filtering assembly 3 to clean the filtering waste in the ceramic membrane filter group and output the filtering waste to the circulation tank 6 to ensure the purified water effect of the re-filtering device;

[0068] After the filtering waste in the re-filtering assembly 3 is discharged, the connection between the re-filtering assembly 3 and the circulation tank 6 is closed, and the water continuously circulates in and out between the positive flushing water tank 7 and the re-filtering assembly 3. Specifically, the cleaning effect on the re-filtering assembly 3 is increased. After a period of time, the re-filtering assembly 3 is connected to the circulation tank 6, and the connection between the re-filtering assembly 3 and the positive flushing water tank 7 is closed. The positive flushing water is all output to the circulation tank 6 through the re-filtering assembly 3. The circulation filtration is restarted between the circulation tank 6 and the re-filtering assembly 3, so that while the positive flushing water tank 7 cleans the re-filtering assembly 3, it also achieves the effect of the third filtration, causing the waste solvent to finally accumulate in the circulation tank 6, and the purified water is discharged through the purified water outlet pipeline 4. After the sewage in the circulation tank 6 reaches a certain concentration, the sewage is discharged through the third water pump 12 to realize the separation of purified water and waste, and there is no need to remove the filter element for cleaning.

Claims

1. A purification and recycling device for industrial wastewater, comprising a primary filtration device, a first water pump (1), a re-filtration device, a recycling device, and a second water pump (2). The first water pump (1) inputs sewage into the primary filtration device, and the primary filtration device outputs pre-filtered water to the recycling device. It is characterized in that: The re-filtering device includes a re-filtering assembly (3), a purified water outlet pipeline (4), and a re-filtered water outlet pipeline (5). The re-filtered water outlet pipeline (5) is communicated with the circulation device, and the purified water outlet pipeline (4) is used for outputting purified water; The circulation device includes: A circulation tank (6) with a sewage inlet pipeline (6.1) communicated with the primary filtering device provided at the upper part thereof, and a circulating water outlet pipeline (6.2) provided at the bottom of the circulation tank (6); A second water pump (2) that outputs circulating water or purified water to circulate between the re-filtering device and the circulation device, The second water pump (2) conveys the circulating water in the circulation tank (6) to the re-filtering assembly (3) for secondary filtering, outputs part of the purified water to the positive flushing tank (7) through the purified water outlet pipeline (4), discharges another part of the purified water, and the remaining sewage returns to the circulation tank (6) after passing through the re-filtering device, increasing the proportion of the waste solvent precipitated at the bottom of the circulation tank (6); A positive flushing tank (7), part of the purified water is output to the positive flushing tank (7) through the purified water outlet pipeline (4), the circulation tank (6) stops discharging water, the positive flushing tank (7) outputs positive flushing water to the re-filtering assembly (3) through the second water pump (2). After the filtered waste in the re-filtering assembly (3) is discharged, the connection between the re-filtering assembly and the circulation tank (6) is closed, and continuous circulation of water inlet and outlet occurs between the positive flushing tank (7) and the re-filtering assembly (3). Subsequently, the re-filtering assembly (3) outputs positive flushing water into the circulation tank (6), and the connection between the re-filtering assembly (3) and the positive flushing tank (7) is closed; A control device that controls the opening or closing of the purified water outlet pipeline (4), the re-filtered water outlet pipeline (5), and the circulating water outlet pipeline (6.2) when the positive flushing tank (7) outputs; 2. The purification and recycling equipment for industrial wastewater according to claim 1, wherein: The circulation device further includes a gas flushing tank (8), and the gas flushing tank (8) outputs gas through the re-filtering device and the circulation tank (6).

3. The purification and recycling equipment for industrial wastewater according to claim 1, characterized in that: The primary filtering device includes a magnetic filtering cylinder (9) and a filter screen cylinder (10) that are communicated with each other. The filter screen cylinder (10) is communicated with the circulation tank (6), and sewage outlets (11) are respectively provided on the filter screen cylinder (10) and the magnetic filtering cylinder (9).

4. A purification and recycling device for industrial wastewater according to claim 1, characterized in that: The bottom of the circulation tank (6) is connected with a third water pump (12), and the third water pump (12) is used for discharging the concentrated sewage at the bottom of the circulation tank (6).

5. The purification and recycling equipment for industrial wastewater according to claim 1, wherein: The control device includes a first high liquid level gauge (6.3) and a first low liquid level gauge (6.4) provided in the circulation tank (6). The first high liquid level gauge (6.3) is used to control the first water pump (1) to stop working, and the first low liquid level gauge (6.4) is used to control the first water pump (1) to open; The control device includes a second high liquid level gauge (7.1) and a second low liquid level gauge (7.2) provided in the positive flushing tank (7). The second high liquid level gauge (7.1) is used to close the connection between the purified water outlet pipeline (4) and the positive flushing tank (7), and the second low liquid level gauge (7.2) is used to open the connection between the purified water outlet pipeline and the positive flushing tank (7) so that the purified water outlet pipeline outputs part of the purified water to the positive flushing tank (7).

6. The purification and recycling equipment for industrial wastewater according to claim 5, characterized in that: The positive flushing water tank (7) is connected to the tap water pipeline to supplement clean water until the water level in the positive flushing water tank (7) reaches the second high level gauge (7.1).

7. The purification and recycling equipment for industrial wastewater according to claim 1, wherein: The re-filtering assembly (3) includes at least one first ceramic membrane filtering group (3.1) and at least one second ceramic membrane filtering group (3.2). The tops of the first ceramic membrane filtering group (3.1) and the second ceramic membrane filtering group (3.2) are connected. The first ceramic membrane filtering group (3.1) is connected to the circulating water outlet pipeline (6.2), and the second ceramic membrane filtering group (3.2) is connected to the re-filtered water outlet pipeline (5) and the positive flushing water tank (7).

8. A purification and recycling method for the industrial wastewater purification and recycling equipment according to any one of claims 1 to 7, characterized in that, It includes the following steps: A. Preliminary filtration: When the water level in the circulation tank (6) is lower than the first low level gauge (6.4), the first water pump (1) works to output sewage, which successively passes through the magnetic filtering cylinder (9) and the filter screen cylinder (10). B. Sewage circulation: The initially filtered water is input into the circulation tank (6) until the water level in the circulation tank (6) reaches the first high level gauge (6.3). The second water pump (2) outputs the circulating water in the circulation tank (6) to the re-filtering assembly (3). The clean water passing through the re-filtering assembly (3) is discharged through the clean water outlet pipeline (4), and the re-filtered water passing through the re-filtering assembly (3) returns to the circulation tank (6) through the re-filtered water outlet pipeline (5). C. Positive flushing: c1 The sewage inlet, the clean water outlet pipeline (4), and the circulating water outlet pipeline (6.2) are closed. The second water pump (2) works to output the clean water in the positive flushing water tank (7) to the re-filtering assembly (3) to press the sewage in the re-filtering assembly (3) into the circulation tank (6) through the re-filtered water outlet pipeline (5). c2 The re-filtered water outlet pipeline (5) is continuously opened for n seconds and then closed, and the clean water outlet pipeline (4) is opened and connected to the positive flushing water tank (7) to clean the re-filtering assembly (3). c3 The clean water outlet pipeline (4) is continuously opened for m seconds and then disconnected from the positive flushing water tank (7), and the re-filtered water outlet pipeline (5) is opened to input all the positive flushing water into the circulation tank (6). D. Return to step B, continuously circulate to discharge clean water, and after the sewage in the circulation tank (6) reaches a certain concentration, the third water pump (12) discharges the concentrated sewage at the bottom of the circulation tank (6).

9. The purification and recycling method of an industrial wastewater purification and recycling device according to claim 8, characterized in that: In step B, it also includes replenishing water to the positive flushing water tank (7): When the water level in the positive flushing water tank (7) is lower than the second low level gauge (7.2), the clean water outlet pipeline (4) is connected to the positive flushing water tank (7) to input part of the clean water into it, and the positive flushing water tank (7) is connected to the tap water pipeline to supplement clean water until the water level in the positive flushing water tank (7) reaches the second high level gauge (7.1).

10. The purification and recycling method of an industrial wastewater purification and recycling device according to claim 9, characterized in that: In step c1, it also includes air flushing: The air flushing tank (8) outputs gas to the clean water outlet pipeline (4) and enters the re-filtering assembly (3).

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