A filtration system

Abstract

The utility model belongs to the technical field of sewage treatment, and discloses a filtering system, comprising a filter tank, an air dissolving pump, a slag chamber, a filter element assembly and a clean water outlet, wherein the filter tank is used for filtering sewage, the air dissolving pump is connected with the filter tank, the air dissolving pump provides bubbles for the filter tank, the filter tank is provided with a sewage outlet connected with the sewage chamber, a clean water outlet for leading out filtered clean water, a first slag discharge outlet and a second slag discharge outlet, the first slag discharge outlet is arranged at the top of the filter tank, the second slag discharge outlet is arranged at the bottom of the filter tank, the slag chamber is used for storing waste slag filtered out of the sewage, the first slag discharge outlet and the second slag discharge outlet are both connected with the slag chamber, the filter element assembly is used for filtering sewage, the filter element assembly is connected with the clean water outlet, the clean water outlet is connected with the clean water outlet, and the clean water outlet is used for discharging clean water.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a filtering system. Background Art

[0002] The oily soot-containing wastewater from the flue gas washing system of the ship cannot be discharged directly into the sea, nor can it be stored in large quantities on board. Due to the limited space on board, storing large amounts of wastewater will affect the stability of the ship. In addition, it is too expensive for ships to handle large amounts of oily soot-containing wastewater in ports, which increases operating costs. At the same time, unclean flue gas that flows back into the cylinder will damage the engine. Therefore, the scrubber of the ship's exhaust gas recirculation system needs to be supplemented with new clean water. The stock of fresh water on board is limited, so it is necessary to expand the source of clean water.

[0003] Most existing ships use disc centrifuges to filter and treat oily soot-containing sewage. However, oily soot-containing sewage is easy to adhere to the discs, and the sewage particle size is micron-level, with a small specific gravity difference, which places particularly high demands on disc centrifuges and is costly. At the same time, high-speed centrifuges have a relatively small processing capacity, high noise, complex maintenance, and low cost-effectiveness. Therefore, a filtration system is urgently needed to solve the above problems. Utility Model Content

[0004] One purpose of the utility model is to:

[0005] A filtering system is provided, which uses a filter tank to adsorb oil smoke particles in sewage on the surface of bubbles to achieve the purpose of solid-liquid separation, and filters sewage through a filter component to obtain clean water and discharge it, thereby reducing the cost of sewage treatment and replenishing clean water.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A filtration system, comprising:

[0008] A filter tank and an air dissolving pump, wherein the air dissolving pump is connected to the filter tank, and the air dissolving pump provides bubbles for the filter tank. The filter tank comprises a sewage outlet, a clean water outlet, a first slag discharge outlet, and a second slag discharge outlet. The sewage outlet is connected to the sewage tank, the sewage outlet is used to introduce the sewage, and the clean water outlet is used to output the filtered clean water. The first slag discharge outlet is arranged at the top of the filter tank, and the second slag discharge outlet is arranged at the bottom of the filter tank.

[0009] A slag chamber, the slag chamber is used to store waste slag filtered out of the sewage, and the first slag discharge port and the second slag discharge port are both connected to the slag chamber;

[0010] A filter element assembly is disposed in the filter tank, the filter element assembly is used to filter the sewage, and the filter element assembly is connected to the clean water outlet;

[0011] A clean water outlet is communicated with the clean water port, and the clean water outlet is used to discharge the clean water.

[0012] Preferably, the filtration system also includes a buffer tank, which is arranged between the filtration tank and the slag chamber, and the buffer tank is respectively connected to the first slag discharge port and the second slag discharge port, a third slag discharge port is provided at the top of the buffer tank, and a fourth slag discharge port is provided at the bottom of the buffer tank, and the third slag discharge port and the fourth slag discharge port are both connected to the slag chamber, and the buffer tank is also provided with a sewage tank inlet, and the sewage tank inlet is connected to the sewage tank.

[0013] Preferably, a mixer is provided between the sewage tank and the filter tank, the mixer is provided with a flocculant inlet, the flocculant inlet is used for introducing flocculant, and the mixer can provide mixing reaction between the flocculant and the sewage.

[0014] Preferably, a first regulating valve is provided between the first slag discharge port and the buffer tank, and the first regulating valve is used to adjust the slag discharge amount of the first slag discharge port; and / or

[0015] A second regulating valve is provided between the second slag discharge port and the buffer tank, and the second regulating valve is used to adjust the slag discharge amount of the second slag discharge port.

[0016] Preferably, a first control valve is provided between the buffer tank and the sewage tank, and the first control valve is used to control sewage backflow.

[0017] Preferably, a pneumatic diaphragm pump is provided between the fourth slag discharge port and the slag chamber, and the pneumatic diaphragm pump is used to suck out the waste slag settled at the bottom of the buffer tank.

[0018] Preferably, an oil content meter is provided between the clean water outlet and the clean water port, and the oil content meter is used to detect the oil content in the clean water entering the clean water outlet to determine whether the clean water meets the discharge requirements.

[0019] Preferably, a three-way valve is provided between the clean water outlet and the oil content meter, and the three-way valve is used to control the discharge of the clean water;

[0020] When the clean water meets the discharge requirements, the three-way valve is connected to the clean water outlet;

[0021] When the clean water does not meet the discharge requirements, the three-way valve is connected to the sewage tank.

[0022] Preferably, the filtration system is further provided with a backwash pump, which is connected to the clean water outlet and is used for backwashing the filter element assembly.

[0023] Preferably, the filtration system further comprises a constant pressure valve, which is connected to the filtration tank and is used to ensure that the pressure of the filtration tank is constant.

[0024] The beneficial effects of the utility model are:

[0025] The utility model provides a filtering system, including a filter tank, an air dissolving pump, a slag chamber, a filter element assembly and a clean water outlet, the filter tank is used to filter sewage, the air dissolving pump is connected to the filter tank, the air dissolving pump provides bubbles for the filter tank, the filter tank includes a sewage port connected to the sewage chamber, a clean water port for leading out the filtered clean water, a first slag discharge port and a second slag discharge port, the first slag discharge port is arranged at the top of the filter tank, the second slag discharge port is arranged at the bottom of the filter tank, the slag chamber is used to store waste slag filtered out of the sewage, the first slag discharge port and the second slag discharge port are both connected to the slag chamber, and the bubbles in the filter tank adsorb the oil smoke particles in the sewage into the bubbles On the surface, since the density of bubbles is much smaller than that of water, the bubbles carry the oil smoke particles to the surface of the liquid, that is, the top of the filter tank, to achieve a state of solid-liquid separation, and the waste residue on the top of the filter tank is discharged into the slag compartment through the first slag discharge port, and the remaining waste residue with a density greater than that of water settles to the bottom of the filter tank and is discharged into the slag compartment through the second slag discharge port. The waste residue in the slag compartment is uniformly treated to avoid polluting the seawater. The filter element assembly is arranged in the filter tank, and the filter element assembly is used to filter sewage, filter out the waste residue in the sewage, and obtain clean water after the sewage is filtered by the filter element assembly. The clean water flows from the clean water inlet to the clean water outlet, and is finally discharged from the clean water outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The utility model is further described in detail below according to the accompanying drawings and embodiments;

[0027] Figure 1 is a schematic diagram of the filtration system;

[0028] Figure 2 The flowchart of the filtration system.

[0029] In the figure:

[0030] 1. Filter tank; 101. First slag discharge port; 102. Second slag discharge port;

[0031] 2. Dissolved air pump;

[0032] 3. Sewage tank;

[0033] 4. Slag chamber;

[0034] 5. Filter element assembly;

[0035] 6. Clean water outlet;

[0036] 7. Buffer tank; 701. The third slag discharge port; 702. The fourth slag discharge port;

[0037] 8. Mixer; 81. Flocculant inlet;

[0038] 91, first control valve; 92, second control valve; 93, third control valve; 94, fourth control valve; 95, fifth control valve;

[0039] 10. Pneumatic diaphragm pump;

[0040] 11. Oil content meter;

[0041] 12. Three-way valve;

[0042] 13. Backwash pump;

[0043] 14. Constant pressure valve;

[0044] 151, first regulating valve; 152, second regulating valve;

[0045] 16. Control box;

[0046] 17. Differential pressure level sensor;

[0047] 18. Differential pressure sensor;

[0048] 19. Compressed air inlet;

[0049] 20. Clear water entrance;

[0050] 21. Flow meter. DETAILED DESCRIPTION

[0051] In order to make the technical problems solved by the utility model, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0052] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0054] In the description of this article, it should be understood that the terms "upper", "lower", "left", "right", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0055] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0056] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0057] like Figure 1 to Figure 2 As shown, the utility model provides a filtering system, including a filter tank 1, an air dissolving pump 2, a slag chamber 4 and a filter element assembly 5, the filter element assembly 5 is arranged in the filter tank 1, the filter element assembly 5 is used to filter sewage, the air dissolving pump 2 provides bubbles for the filter tank 1, the filter tank 1 is provided with a sewage outlet, a clean water outlet, a first slag discharge outlet 101 and a second slag discharge outlet 102, the sewage outlet is connected with the sewage chamber 3, the sewage outlet is used to introduce sewage, the clean water outlet is used to export filtered clean water, the first slag discharge outlet 101 is arranged at the top of the filter tank 1, the second slag discharge outlet 102 is arranged at the bottom of the filter tank 1, the first slag discharge outlet 101 and the second slag discharge outlet 102 are both connected with the slag chamber 4, the slag chamber 4 is used to store waste residue filtered out of sewage, the filtering system is also provided with a clean water outlet 6, the clean water outlet 6 is connected with the clean water outlet of the filter tank 1, and the clean water outlet 6 is used to discharge clean water.

[0058] In actual work, the sewage tank 3 injects sewage into the filter tank 1, and the dissolved air pump 2 injects air bubbles into the filter tank 1. The air bubbles in the filter tank 1 adsorb the oil fume particles in the sewage on the surface of the air bubbles. Since the density of the air bubbles is much smaller than the density of water, the air bubbles carry the oil fume particles to the liquid surface, that is, the top of the filter tank 1, to achieve a state of solid-liquid separation. The waste residue on the top of the filter tank 1 is discharged into the slag tank 4 through the first slag discharge port 101, and the remaining waste residue with a density greater than that of water precipitates and sinks to the bottom of the filter tank 1, and is discharged into the slag tank 4 through the second slag discharge port 102. The waste residue in the slag tank 4 is uniformly treated to avoid polluting the seawater. The filter element assembly 5 is arranged in the filter tank 1. The filter element assembly 5 is used to filter sewage and filter out the waste residue in the sewage. Clean water is obtained after the sewage is filtered by the filter element assembly 5. The clean water flows from the clean water outlet to the clean water outlet 6, and is finally discharged from the clean water outlet 6.

[0059] Exemplarily, the other end of the air dissolving pump 2 is connected to the compressed air inlet 19, and the compressed air flows to the air dissolving pump 2 through the compressed air inlet 19, and the air dissolving pump 2 introduces the compressed air into the filter tank 1 to form a large number of bubbles. In this embodiment, the bubbles are micron-sized bubbles, which can effectively absorb oil fume particles and can be filtered by the filter element assembly 5.

[0060] Exemplarily, the filter element of the filter element assembly 5 is made of hydrophilic materials, such as cotton, paper, polyester fiber, polypropylene fiber, polyethersulfone membrane and other materials. In this embodiment, the filter element of the filter element assembly 5 is a micron-level filter element, which can effectively isolate the oil fume particles in the sewage and the bubbles combined with the oil fume particles.

[0061] Exemplarily, the filtration system is also provided with a clean water inlet 20, which is connected to the filter tank 1. Before the filtration system works, the filtration system fills the filter tank 1 with clean water through the clean water inlet 20, and the clean water soaks the filter element assembly 5 to ensure that the filter element assembly 5 can work normally.

[0062] Furthermore, the other end of the dissolved air pump 2 is connected to the filter tank 1 through the clean water inlet 20, and the two ends of the dissolved air pump 2 are respectively connected to the filter tank 1 to form a backflow, thereby enhancing the flotation effect.

[0063] Furthermore, a third control valve 93 is provided between the other end of the air dissolving pump 2 and the filter tank 1 , and the third control valve 93 is used to control the reflux flow rate of the clean water that has undergone the first filtration.

[0064] Furthermore, a flow meter 21 is provided between the third control valve 93 and the filter tank 1 , and the flow meter 21 is used to detect the reflux flow of the clean water after the first filtration.

[0065] In this embodiment, the clean water inlet 20 is connected to the seawater, and a fourth control valve 94 is provided between the clean water inlet 20 and the filter tank 1. The fourth control valve 94 is used to control the connection between the clean water inlet 20 and the filter tank 1. When the clean water fills the filter tank 1, the clean water inlet 20 is closed to prevent the sewage in the filter tank 1 from flowing back into the sea through the clean water inlet 20 and polluting the environment.

[0066] In other embodiments, the clean water inlet 20 is connected to a water source on board, lake water or river water.

[0067] Due to the stability and space issues of the ship, the space of the slag compartment 4 on board is limited, and the water content of the waste slag discharged into the slag compartment 4 should be reduced as much as possible, especially in the floating waste slag. Since the oil smoke particles in the sewage combine with the bubbles, the floating waste slag contains a high amount of water. Therefore, the filtration system provided in this embodiment also includes a buffer tank 7, which is arranged between the filter tank 1 and the slag compartment 4. The buffer tank 7 is used to further precipitate the waste slag. The buffer tank 7 is connected to the first slag discharge port 101 and the second slag discharge port 102 respectively. The top of the buffer tank 7 is provided with a third slag discharge port 701, and the bottom of the buffer tank 7 is provided with a The fourth slag discharge port 702, the third slag discharge port 701 and the fourth slag discharge port 702 are all connected to the slag compartment 4, and the buffer tank 7 is also provided with a sewage compartment inlet, which is connected to the sewage compartment 3. The waste slag flowing to the buffer tank 7 through the first slag discharge port 101 and the second slag discharge port 102 is precipitated and separated again in the buffer tank 7. The waste slag with a density less than that of the sewage floats to the top of the buffer tank 7 and enters the slag compartment 4 through the third slag discharge port 701, and the waste slag with a density greater than that of the sewage sinks to the bottom of the buffer tank 7 and enters the slag compartment 4 through the fourth slag discharge port 702, and the remaining sewage flows back to the sewage compartment 3 through the sewage compartment inlet.

[0068] Exemplarily, a first regulating valve 151 is provided between the first slag discharge port 101 and the buffer tank 7, and the first regulating valve 151 is used to adjust the slag discharge amount of the first slag discharge port 101. A second regulating valve 152 is provided between the second slag discharge port 102 and the buffer tank 7, and the second regulating valve 152 is used to adjust the slag discharge amount of the second slag discharge port 102. The first regulating valve 151 and the second regulating valve 152 are used to ensure that the slag discharge amount is within the working load of the buffer tank 7, and ensure that the waste slag in the buffer tank 7 can be fully settled and separated.

[0069] Exemplarily, a first control valve 91 is provided between the buffer tank 7 and the sewage tank 3 , and the first control valve 91 is used to control the sewage backflow.

[0070] Furthermore, an overflow port is provided on the top of the filter tank 1, and the overflow port is connected to the sewage tank 3. When the filter tank 1 is full, the sewage flows back into the sewage tank 3 through the overflow port on the top of the filter tank 1, further reducing the water content of the waste slag in the slag tank 4.

[0071] Furthermore, a differential pressure level sensor 17 is provided between the overflow port and the first control valve 91. The differential pressure level sensor 17 is used to assist the buffer tank 7 in discharging slag and control the amount of slag discharged from the buffer tank 7. The differential pressure level sensor 17 is an existing product and will not be described in detail here.

[0072] Exemplarily, a mixer 8 is provided between the sewage tank 3 and the filter tank 1. The mixer 8 is provided with a flocculant inlet 81. The flocculant inlet 81 is used to introduce a flocculant. The mixer 8 can allow the flocculant to fully mix and react with the sewage, so that the oil molecules and soot particles in the sewage can flocculate, making it easier to adhere to the surface of the bubbles and separate as the bubbles rise, thereby improving the filtering effect on the sewage.

[0073] Exemplarily, a second control valve 92 is provided between the mixer 8 and the sewage tank 3, and the second control valve 92 is used to control the amount of sewage introduced to ensure that the sewage in the mixer 8 can fully react with the flocculant.

[0074] Exemplarily, a pneumatic diaphragm pump 10 is provided between the fourth slag discharge port 702 and the slag chamber 4 , and the pneumatic diaphragm pump 10 is used to suck out the waste slag settled at the bottom of the buffer tank 7 to prevent the waste slag from being adsorbed at the bottom of the buffer tank 7 and to avoid the waste slag from clogging the fourth slag discharge port 702 .

[0075] Exemplarily, the filtration system is also provided with a backwash pump 13, which is connected to the clean water outlet, that is, the backwash pump 13 is connected to the filter element assembly 5. The backwash pump 13 can reversely flush the clean water to the filter element assembly 5 to prevent the filter element from being blocked and ensure the filtration efficiency of the filtration system.

[0076] Furthermore, a differential pressure sensor 18 is provided between the backwash pump 13 and the filter element assembly 5. The differential pressure sensor 18 is used to detect the water outlet pressure of the clean water outlet and determine whether the filter element assembly 5 is blocked or the flow rate is reduced, so that the backwash pump 13 can be started in time and the filter element assembly 5 can be backwashed, thereby improving the sewage filtration efficiency and extending the service life of the filter element assembly 5.

[0077] An oil content meter 11 is provided between the clean water outlet 6 and the clean water outlet. In the present embodiment, the oil content meter 11 is provided between the buffer tank 7 and the clean water outlet 6. The oil content meter 11 is used to detect the oil content in the clean water entering the clean water outlet 6 to determine whether the clean water meets the discharge requirements.

[0078] Exemplarily, a three-way valve 12 is provided between the clean water outlet 6 and the oil content meter 11. The three-way valve 12 is used to control the discharge of the clean water. When the oil content meter 11 detects that the oil content in the clean water is not greater than a preset value, the clean water meets the discharge requirement, and the three-way valve 12 is connected to the clean water outlet 6; when the oil content meter 11 detects that the oil content in the clean water is greater than a preset value, the clean water does not meet the discharge requirement, and the three-way valve 12 is connected to the sewage tank 3. In this embodiment, the preset value of the oil content is 15ppm.

[0079] Exemplarily, a fifth control valve 95 is provided between the filter tank 1 and the oil content meter 11 , and the fifth control valve 95 is used to control the flow of clean water flowing to the oil content meter 11 .

[0080] In this embodiment, part of the clean water filtered and treated by the filter tank 1 and the filter element assembly 5 flows back to the filter tank 1 through the dissolved air pump 2, and the other part is detected by the oil content meter 11. Specifically, 20% of the clean water filtered and treated flows back through the dissolved air pump 2, and 80% of the clean water filtered and treated is detected by the oil content meter 11.

[0081] Exemplarily, the filtration system further includes a constant pressure valve 14 , which is connected to the filtration tank 1 , and is used to ensure that the pressure of the filtration tank 1 is constant.

[0082] Furthermore, a constant pressure valve 14 is arranged in parallel with the oil separator 11. The constant pressure valve 14 ensures that the flow rate and pressure of the oil separator 11 are maintained within the rated working range, thereby ensuring the detection accuracy of the oil separator 11. At the same time, the oil separator 11 needs to be cleaned regularly to prevent excessive errors in the detection results due to internal uncleanliness.

[0083] The filtration system further includes a control box 16. In this embodiment, the first control valve 91, the second control valve 92, the third control valve 93, the fourth control valve 94 and the fifth control valve 95 are all electric ball valves, and all the electric ball valves are electrically connected to the control box 16. The control box 16 is provided with a PLC program, which can automatically control all the electric ball valves so that the entire filtration system can operate automatically. The electric ball valve is a prior art and will not be described in detail here.

[0084] like Figure 2 As shown, in the actual working process, firstly, clean water is introduced to fill the filter tank 1, and the sewage containing oily soot particles flows from the sewage tank 3 to the mixer 8. The flocculant is injected into the mixer 8 so that the oily soot particles in the sewage can fully combine and react with the flocculant. The sewage combined with the flocculant is injected into the filter tank 1, and part of the waste residue adheres to the surface of the bubbles and floats to the top of the filter tank 1 with the bubbles, and part of the waste residue settles to the bottom of the filter tank 1. The waste residue flowing out of the filter tank 1 enters the buffer tank 7 and is naturally precipitated and separated in the buffer tank 7. Part of the waste residue floats up and enters the slag compartment 4 through the third slag discharge port 701, and the other part of the waste residue sinks and enters the slag compartment 4 through the fourth slag discharge port 702, and the remaining sewage flows back to the sewage tank 3. At the same time, the clean water filtered by the filter tank 1 and the filter element assembly 5 flows to the oil separator 11, and the oil separator 11 detects the oil content of the clean water. When the oil content is not more than 15PPM, the clean water is discharged through the clean water outlet 6. When the oil content is more than 15PPM, the clean water flows back to the sewage tank 3 and is filtered again.

[0085] In addition, the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A filtration system, characterized in that: include: A filter tank (1) and an air dissolving pump (2), wherein the air dissolving pump (2) is connected to the filter tank (1), and the air dissolving pump (2) provides bubbles for the filter tank (1). The filter tank (1) is provided with a sewage outlet, a clean water outlet, a first slag discharge outlet (101) and a second slag discharge outlet (102), wherein the sewage outlet is connected to a sewage tank (3), the sewage outlet is used to introduce the sewage, and the clean water outlet is used to discharge the filtered clean water. The first slag discharge outlet (101) is arranged at the top of the filter tank (1), and the second slag discharge outlet (102) is arranged at the bottom of the filter tank (1); A slag chamber (4), the slag chamber (4) being used to store waste slag filtered out of the sewage, the first slag discharge port (101) and the second slag discharge port (102) both being in communication with the slag chamber (4); A filter element assembly (5) is arranged in the filter tank (1), the filter element assembly (5) is used to filter the sewage, and the filter element assembly (5) is connected to the clean water outlet; A clean water outlet (6), the clean water outlet (6) is communicated with the clean water inlet, and the clean water outlet is used to discharge the clean water.

2. The filtration system according to claim 1, characterized in that: The filtering system further comprises a buffer tank (7), wherein the buffer tank (7) is arranged between the filtering tank (1) and the slag chamber (4), the buffer tank (7) being communicated with the first slag discharge port (101) and the second slag discharge port (102) respectively, the top of the buffer tank (7) being provided with a third slag discharge port (701), the bottom of the buffer tank (7) being provided with a fourth slag discharge port (702), the third slag discharge port (701) and the fourth slag discharge port (702) both being communicated with the slag chamber (4), and the buffer tank (7) being further provided with a sewage chamber inlet, the sewage chamber inlet being communicated with the sewage chamber (3).

3. The filtration system according to claim 1, characterized in that: A mixer (8) is provided between the sewage tank (3) and the filter tank (1), and the mixer (8) is provided with a flocculant inlet (81). The flocculant inlet (81) is used to introduce a flocculant, and the mixer (8) can allow the flocculant to mix and react with the sewage.

4. The filtration system according to claim 2, characterized in that: A first regulating valve (151) is provided between the first slag discharge port (101) and the buffer tank (7), and the first regulating valve (151) is used to adjust the slag discharge amount of the first slag discharge port (101); and / or A second regulating valve (152) is provided between the second slag discharge port (102) and the buffer tank (7), and the second regulating valve (152) is used to adjust the slag discharge amount of the second slag discharge port (102).

5. The filtration system according to claim 4, characterized in that: A first control valve (91) is provided between the buffer tank (7) and the sewage tank (3), and the first control valve (91) is used to control sewage backflow.

6. The filtration system according to claim 2, characterized in that: A pneumatic diaphragm pump (10) is provided between the fourth slag discharge port (702) and the slag chamber (4), and the pneumatic diaphragm pump (10) is used to suck out the waste slag deposited at the bottom of the buffer tank (7).

7. The filtration system according to claim 1, characterized in that: An oil content meter (11) is provided between the clean water outlet (6) and the clean water port, and the oil content meter (11) is used to detect the oil content in the clean water entering the clean water outlet (6) to determine whether the clean water meets the discharge requirements.

8. The filtration system according to claim 7, characterized in that: A three-way valve (12) is provided between the clean water outlet (6) and the oil content meter (11), and the three-way valve (12) is used to control the discharge of the clean water; When the clean water meets the discharge requirements, the three-way valve (12) is connected to the clean water outlet (6); When the clean water does not meet the discharge requirements, the three-way valve (12) is connected to the sewage tank (3).

9. The filtration system according to claim 1, characterized in that: The filtration system is also provided with a backwash pump (13), the backwash pump (13) being connected to the clean water outlet, and the backwash pump (13) being used for backwashing the filter element assembly (5).

10. The filtration system according to claim 1, characterized in that: The filtration system further comprises a constant pressure valve (14), wherein the constant pressure valve (14) is connected to the filtration tank (1), and the constant pressure valve (14) is used to ensure that the pressure of the filtration tank (1) is constant.

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