Membrane filtration apparatus with ultrasonic cleaning function

Abstract

The utility model relates to coal chemical industry wastewater treatment technical field provides a membrane filtration equipment with ultrasonic cleaning function, including jar body, the filter assembly that is located in the jar body, the backwash component that is located on the filter assembly to and the ultrasonic assembly that is located jar body outside. The jar body bottom is equipped with liquid inlet, and the top is equipped with liquid outlet, and the filter cavity is shaped in the jar body, and the filter cavity is linked with liquid inlet and liquid outlet. The jar body outside is still connected with differential pressure transmitter and ultrasonic controller, and differential pressure transmitter is used for detecting the pressure difference of liquid inlet and liquid outlet. The filter assembly includes a plurality of filter pipe fittings, and the filter pipe fitting includes the flow guide layer, the filter plate and the filter membrane that are sequentially arranged from outside to inside. The jar body middle part is equipped with the vertical pipe that extends along its axial arrangement, and the vertical pipe bottom is connected with the blowdown pipe, and the backwash component is connected with filter pipe fitting and blowdown pipe. The utility model combines through multilayer filtration and ultrasonic effect, realizes the selective separation of high salt wastewater, satisfies the wastewater discharge requirement.

Description

Technical Field

[0001] This utility model relates to the field of coal chemical wastewater treatment technology, and in particular to a membrane filtration device with ultrasonic cleaning function. Background Technology

[0002] Coal chemical saline wastewater refers to wastewater with a total salt content of at least 1%, characterized by high salt content and low levels of other pollutants. Coal chemical saline wastewater contains a variety of salts, such as calcium salts, magnesium salts, chlorides, nitrates, silicates, and phosphates. In recent years, in order to gradually achieve the goal of "zero discharge," in addition to the original saline wastewater, wastewater that still cannot meet the requirements for reuse after pretreatment, biological treatment, and advanced treatment is also classified as saline wastewater for joint treatment, increasing the complexity of water quality and the difficulty of treatment.

[0003] Currently, most modern coal chemical wastewater treatment technologies combine membrane concentration and evaporation crystallization. The mixed salts produced during evaporation crystallization are hazardous waste, requiring landfill disposal at solid waste treatment plants. This method of treating mixed salts is not only limited by the site capacity of solid waste treatment plants but also poses a long-term environmental risk of leachate contamination of soil and groundwater, causing secondary environmental pollution. Traditional evaporation crystallization technology produces mixed salts, leading to membrane fouling and necessitating frequent chemical cleaning, resulting in high energy consumption and low crystal purity. Utility Model Content

[0004] In view of this, the present invention aims to provide a membrane filtration device with ultrasonic cleaning function to improve the salt separation effect and meet the wastewater discharge requirements.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A membrane filtration device with ultrasonic cleaning function includes a tank, a filter assembly disposed in the tank, a backwashing assembly disposed on the filter assembly, and an ultrasonic assembly disposed on the outside of the tank. The tank has an inlet at the bottom and an outlet at the top. A filter chamber is formed inside the tank, and the filter chamber is connected to the inlet and the outlet. A differential pressure transmitter is also connected to the outside of the tank body. The differential pressure transmitter is used to detect the pressure difference between the liquid inlet and the liquid outlet. The filtration assembly includes several filter tubes, each of which includes a flow guide layer, a filter plate, and a filter membrane arranged sequentially from the outside to the inside. The tank body is provided with a longitudinal pipe extending along its axial direction in the middle, and a sewage pipe is connected to the bottom of the longitudinal pipe. The backwashing assembly connects the filter pipe and the sewage pipe.

[0006] Furthermore, the filter assembly also includes connecting plates respectively disposed at the upper and lower parts of the filter tube, and the connecting plates are provided with a plurality of flow holes; The filter fitting has a through pipe formed inside it along its axial direction, and the longitudinal pipe has a flow pipe formed inside it. During backwashing, water flows from the flow pipe to the drain pipe.

[0007] Furthermore, a drive unit is provided above the tank body, and the backwashing assembly includes a connecting part, which is sleeved on the outside of the longitudinal pipe, and the power output end of the drive unit is connected to the connecting part; When the connecting part is driven to rotate, the connecting part connects the through pipe with the flow hole.

[0008] Furthermore, the connecting part includes an upper connecting pipe and a lower connecting pipe, and the longitudinal pipe is provided with a plurality of first connecting holes and second connecting holes that are radially through it; The flow hole includes a first circular hole and a second circular hole. The upper connecting pipe connects the first circular hole and the first connecting hole, and the lower connecting pipe connects the second circular hole and the second connecting hole.

[0009] Furthermore, the outlet is connected to an outlet pipe, and the outlet pipe is equipped with a first shut-off valve; A second shut-off valve is connected to the sewage pipe.

[0010] Furthermore, the filter plate is arranged in a ring shape, and has a plurality of circumferentially spaced arc-shaped grooves arranged radially along the filter plate, with multiple rows of arc-shaped grooves arranged along the height direction of the filter plate; The filter membrane is arranged in a ring shape and attached to the inner side of the filter plate.

[0011] Furthermore, the flow guiding layer includes a plurality of spaced flow guiding plates, which are connected in a ring to the outside of the filter plate. Each flow guiding plate includes a connecting plate connected to the filter plate, an inclined plate that is inclined upward, and a flap connected to the upper end of the inclined plate. The flap is arranged parallel to the connecting plate.

[0012] Furthermore, a flow gap is formed between two adjacent connecting plates, and the two adjacent arc-shaped grooves in the flow gap are connected.

[0013] Furthermore, a zeolite molecular sieve membrane is provided in the flow gap, a carbon nanotube composite membrane is provided in the arc-shaped groove, and the filter membrane is a graphene-modified polyvinylidene fluoride membrane.

[0014] Compared with the prior art, this utility model has the following advantages: The membrane filtration device with ultrasonic cleaning function described in this utility model has an inlet at the bottom of the tank and an outlet at the top. Wastewater enters the filtration chamber from the inlet and flows out from the outlet. The water flows from the bottom into the filter pipe and passes through the filter membrane, filter plate and flow guide layer in sequence. Through the combination of multi-layer filtration and ultrasonic action, selective separation of high-salt wastewater is achieved, which meets the wastewater discharge requirements. Attached Figure Description

[0015] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 This is a schematic diagram of the structure of the membrane filtration device with ultrasonic cleaning function described in an embodiment of the present invention; Figure 2 This is a top view schematic diagram showing the connection between the backwashing assembly and the upper connecting plate described in this embodiment of the utility model; Figure 3 This is a top view of the connecting plate described in an embodiment of the present utility model; Figure 4 This is a cross-sectional view of the filter fitting described in an embodiment of the present invention during filtration. Figure 5 This is a cross-sectional view of the filter pipe described in this embodiment of the present invention during backwashing.

[0016] Explanation of reference numerals in the attached figures: 1. Tank body; 2. Filter assembly; 3. Backwash assembly; 4. Ultrasonic assembly; 5. Differential pressure transmitter; 6. Second shut-off valve; 7. Longitudinal pipe; 8. Drain pipe; 9. Drive unit; 10. Liquid outlet pipe; 11. First shut-off valve; 101. Liquid inlet; 102. Liquid outlet; 103. Filter chamber; 201. Filter fittings; 202. Connecting plate; 301. Connecting part; 701, First connecting hole; 702, Second connecting hole; 2011, Flow guide layer; 2012, Filter plate; 2013, Filter membrane; 2014, Through-flow pipe; 2021, First circular hole; 2022, Second circular hole; 3011, Upper connecting pipe; 3012, Lower connecting pipe; 20111, Connecting plate; 20112, Inclined plate; 20113, Flip plate; 20114, Flow gap; 20121, Arc-shaped groove. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0018] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," and "back," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" 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 in light of the specific circumstances.

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] This embodiment relates to a membrane filtration device with ultrasonic cleaning function. Overall, as... Figure 1 As shown, the membrane filtration device includes a tank 1, a filter assembly 2 disposed inside the tank 1, a backwashing assembly 3 disposed on the filter assembly 2, and an ultrasonic assembly 4 disposed outside the tank 1. The tank 1 has an inlet 101 at the bottom and an outlet 102 at the top. A filter chamber 103 is formed inside the tank 1, and the filter chamber 103 connects the inlet 101 and the outlet 102.

[0022] A differential pressure transmitter 5 is connected to the outside of the tank body 1. The differential pressure transmitter 5 is used to detect the pressure difference between the inlet 101 and the outlet 102. The filter assembly 2 includes several filter pipes 201, which include a flow guide layer 2011, a filter plate 2012, and a filter membrane 2013 arranged sequentially from the outside to the inside. A longitudinal pipe 7 extending axially is provided in the middle of the tank body 1. A drain pipe 8 is connected to the bottom of the longitudinal pipe 7. The backwashing assembly 3 connects the filter pipes 201 and the drain pipe 8.

[0023] As described above, the membrane filtration device with ultrasonic cleaning function in this embodiment has an inlet 101 at the bottom of the tank 1 and an outlet 102 at the top. Wastewater enters the filtration chamber 103 from the inlet 101 and flows out from the outlet 102. The water flows into the filter pipe 201 from the bottom and passes through the filter membrane 2013, filter plate 2012 and flow guide layer 2011 in sequence. Through the combination of multi-layer filtration and ultrasonic action, selective separation of high-salt wastewater is achieved, meeting the wastewater discharge requirements.

[0024] Based on the above overall introduction, this embodiment presents an exemplary structure of a membrane filtration device with ultrasonic cleaning function, such as... Figure 1 As shown, the tank 1 is formed into a circular cylindrical structure, the filter chamber 103 is disposed inside the tank 1, the filter assembly 2 is disposed in the middle of the height direction of the tank 1, and the backwash assembly 3 is connected to the tank 1 and located above the filter assembly 2. By setting a differential pressure transmitter 5 to monitor the pressure difference between the inlet 101 and the outlet 102 in real time, the filter assembly 2 is prevented from being blocked and causing membrane fouling, thereby improving the filtration effect and avoiding the high energy consumption cost caused by cleaning the filter membrane 2013.

[0025] As a preferred implementation method, such as Figure 1 As shown, the filter assembly 2 also includes connecting plates 202 respectively disposed at the upper and lower parts of the filter tube 201. The connecting plates 202 are provided with several flow holes. A through pipe 2014 is formed inside the filter tube 201 along its axial direction. A flow pipe is formed inside the longitudinal pipe 7. During backwashing, water flows from the flow pipe to the drain pipe 8. The connecting plates 202 adopt a circular plate structure and are radially disposed in the filter chamber 103. The lower connecting plate 202 is disposed above the liquid inlet 101, and the upper connecting plate 202 is disposed above the liquid outlet 102.

[0026] like Figures 2 to 3 As shown, the flow hole is formed as a circular hole extending through the thickness of the connecting plate 202. Several filter tubes 201 are correspondingly arranged between the two connecting plates 202, with the circular holes corresponding to the filter tubes 201. The diameter of the connecting plate 202 is adapted to the diameter of the filter chamber 103. In this embodiment, the two connecting plates 202 divide the filter chamber 103 into an upper chamber, a middle chamber, and a lower chamber arranged from top to bottom, with the liquid outlet 102 communicating with the middle chamber.

[0027] Preferably, such as Figure 1As shown, a drive unit 9 is provided above the tank body 1. The backwashing assembly 3 includes a connecting part 301, which is sleeved on the outside of the longitudinal tube 7. The power output end of the drive unit 9 is connected to the connecting part 301. When the connecting part 301 is driven to rotate, it connects the through pipe 2014 with the flow hole. In this embodiment, the drive unit 9 is a servo motor. The upper end of the connecting part 301 is sleeved on the outside of the motor's power output shaft. The longitudinal tube 7 passes through the lower end of the connecting part 301 and is fixed to the bottom wall of the tank body 1. A deep groove ball bearing is provided between the connecting part 301 and the longitudinal tube 7 to ensure the flexibility of the connecting part 301's rotation.

[0028] like Figures 1 to 3 As shown, the connecting part 301 includes an upper connecting pipe 3011 and a lower connecting pipe 3012. The longitudinal pipe 7 is provided with a plurality of first connecting holes 701 and second connecting holes 702 arranged radially through it. The flow holes include a first circular hole 2021 and a second circular hole 2022. The upper connecting pipe 3011 connects the first circular hole 2021 and the first connecting hole 701, and the lower connecting pipe 3012 connects the second circular hole 2022 and the second connecting hole 702. The first circular hole 2021 is located outside the second circular hole 2022. The first circular hole 2021 and the second circular hole 2022 are correspondingly arranged at their respective filter fittings 201 to facilitate communication when the connecting part 301 rotates.

[0029] Combination Figures 1 to 5 As shown, the longitudinal tube 7 has a filter pipe 201 formed along its axial direction. During filtration, the first round hole 2021 and the second round hole 2022 are connected to the filter chamber 103. Wastewater enters the lower chamber and enters the filter pipe 201 through the first round hole 2021 and the second round hole 2022. The filtered wastewater enters the through pipe 2014. The water flows through the inner filter membrane 2013, the filter plate 2012 and the guide layer 2011 and enters the intermediate chamber, and then flows out from the outlet 102.

[0030] In the backwashing process, as a feasible implementation method, such as Figure 1 As shown, the outlet 102 is connected to the outlet pipe 10, which is equipped with a first shut-off valve 11. The drain pipe 8 is connected to a second shut-off valve 6. When the first shut-off valve 11 receives a backwash signal, it blocks the outlet pipe 10, and the second shut-off valve 6 on the drain pipe 8 opens. Since the flow pipe in the longitudinal pipe 7 is connected to the outside, the water in the intermediate cavity flows from the outside into the filter pipe 201, passing through the guide layer 2011, the filter plate 2012, and the filter membrane 2013 in sequence, and flows into the through pipe 2014. At this time, the drive unit 9 drives the connecting part 301 to rotate, so that the upper connecting pipe 3011 and the lower connecting pipe 3012 are connected to the first round hole 2021 and the second round hole 2022 on the upper connecting plate 202, thereby allowing the water in the through channel to flow through the connecting part 301 into the flow pipe of the longitudinal pipe 7.

[0031] In addition, such as Figures 4 to 5 As shown, the filter plate 2012 is arranged in a ring shape, and a plurality of circumferentially spaced arc-shaped grooves 20121 are provided along the radial direction of the filter plate 2012. Multiple rows of arc-shaped grooves 20121 are arranged along the height direction of the filter plate 2012. The filter membrane 2013 is annularly fitted onto the inner side of the filter plate 2012. The arc-shaped grooves 20121 are provided on the sidewalls of the filter plate 2012, and a plurality of arc-shaped grooves 20121 are arrayed in both the axial and radial directions of the filter plate 2012.

[0032] Still Figures 4 to 5 As shown, the flow guiding layer 2011 includes several flow guiding plates arranged at intervals. The flow guiding plates are connected in a ring to the outside of the filter plate 2012. The flow guiding plate includes a connecting plate 20111 connected to the filter plate 2012, an inclined plate 20112 arranged at an upward angle, and a flap 20113 connected to the upper end of the inclined plate 20112. The flap 20113 is arranged parallel to the connecting plate 20111.

[0033] Preferably, a flow gap 20114 is formed between two adjacent connecting plates 20111, and two adjacent arc-shaped grooves 20121 above and below the flow gap 20114 are connected. Figure 4 and Figure 5 As shown, the inclined plate 20112 and the flap 20113 form a flow guiding space with the filter plate 2012. During filtration, the water first passes through the filter membrane 2013, and then flows through the arc groove 20121 and the flow gap 20114 into the flow guiding space. The water flows upward at an angle, which facilitates the formation of water flow channels between the liquid outlets 102 and accelerates the flow speed.

[0034] During backwashing, water flows from the intermediate cavity into the guide space. A large amount of water flows into the flow channel formed between the flow gap 20114 and the arc groove 20121, forming a certain water pressure. The water flow with water pressure washes the filter membrane 2013, which can effectively ensure the backwashing effect, form a better wash for the filter membrane 2013, improve the backwashing efficiency, and reduce the backwashing energy consumption. During the backwashing process, the ultrasonic component 4 is used to assist in improving the backwashing effect. Specifically, the ultrasonic component 4 adopts an ultrasonic controller with reference to the existing technology structure, which will not be described in detail here.

[0035] As a preferred embodiment, such as Figures 4 to 5 As shown, a zeolite molecular sieve membrane is provided in the flow gap 20114, a carbon nanotube composite membrane is provided in the arc groove 20121, and the filter membrane 2013 is a graphene-modified polyvinylidene fluoride membrane.

[0036] In practical implementation, a graphene-modified polyvinylidene fluoride (PVDF) membrane is used as a pretreatment layer, with a thickness of 80-120 μm, a pore size of 0.1-0.5 μm, a porosity of 65%-75%, a tensile strength ≥25 MPa, and a graphene doping ratio of 3-5 wt%, forming a three-dimensional network conductive structure. By placing the graphene-modified PVDF membrane within the flow gap 20114, ultrafiltration removes large molecular suspended solids, colloids, and large molecular organic matter, improving hydrophilicity and antifouling performance, and preventing subsequent membrane clogging.

[0037] Among them, a carbon nanocomposite membrane is set in the arc-shaped groove 20121 as an intermediate treatment layer, which can achieve a desalination rate of up to 85% and reduce energy consumption by 60% compared with reverse osmosis. Through the conductivity and adsorption properties of carbon nanotubes, heavy metal ions and some organic pollutants are effectively removed, enhancing the water purification efficiency.

[0038] Secondly, the zeolite molecular sieve membrane, as a desalination treatment layer, is set at the end of the filtration system. It has a pore size of 0.74 nm, a silicon-to-aluminum ratio of 2.5-3.0, and a thickness of 15 μm. Through ion exchange and molecular sieve effect, it selectively adsorbs salt ions, ammonia nitrogen, and radioactive substances, thereby achieving deep desalination and salt crystallization.

[0039] The membrane filtration device with ultrasonic cleaning function in this embodiment, through the above settings, achieves the setting from coarse filtration to fine desalination, avoids membrane fouling and improves wastewater treatment efficiency, is compatible with zero discharge systems, and recovers salt through the drain pipe 8 during backwashing.

[0040] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A membrane filtration device with ultrasonic cleaning function, characterized in that: It includes a tank (1), a filter assembly (2) disposed inside the tank (1), a backwash assembly (3) disposed on the filter assembly (2), and an ultrasonic assembly (4) disposed outside the tank (1). The tank (1) has an inlet (101) at the bottom and an outlet (102) at the top. A filter chamber (103) is formed inside the tank (1), and the filter chamber (103) is connected to the inlet (101) and the outlet (102). A differential pressure transmitter (5) is also connected to the outside of the tank body (1). The differential pressure transmitter (5) is used to detect the pressure difference between the liquid inlet (101) and the liquid outlet (102). The filter assembly (2) includes a plurality of filter tubes (201), each of which includes a flow guide layer (2011), a filter plate (2012), and a filter membrane (2013) arranged sequentially from the outside to the inside. The tank (1) has a longitudinal pipe (7) extending along its axial direction in the middle. The bottom of the longitudinal pipe (7) is connected to a drain pipe (8). The backwashing assembly (3) connects the filter pipe (201) and the drain pipe (8).

2. The membrane filtration device with ultrasonic cleaning function according to claim 1, characterized in that: The filter assembly (2) further includes a connecting plate (202) respectively disposed on the upper and lower parts of the filter tube (201), and the connecting plate (202) is provided with a plurality of flow holes; The filter fitting (201) has a through pipe (2014) formed inside it along its axial direction, and the longitudinal pipe (7) has a flow pipe formed inside it. During backwashing, water flows from the flow pipe to the drain pipe (8).

3. The membrane filtration device with ultrasonic cleaning function according to claim 2, characterized in that: A drive unit (9) is provided above the tank (1). The backwashing assembly (3) includes a connecting part (301). The connecting part (301) is sleeved on the outside of the longitudinal pipe (7). The power output end of the drive unit (9) is connected to the connecting part (301). When the connecting part (301) is driven to rotate, the connecting part (301) connects the through pipe (2014) with the flow hole.

4. The membrane filtration device with ultrasonic cleaning function according to claim 3, characterized in that: The connecting part (301) includes an upper connecting pipe (3011) and a lower connecting pipe (3012). The longitudinal pipe (7) is provided with a plurality of first connecting holes (701) and second connecting holes (702) that are radially through it. The flow hole includes a first circular hole (2021) and a second circular hole (2022). The upper connecting pipe (3011) connects the first circular hole (2021) and the first connecting hole (701). The lower connecting pipe (3012) connects the second circular hole (2022) and the second connecting hole (702).

5. The membrane filtration device with ultrasonic cleaning function according to claim 1, characterized in that: The outlet (102) is connected to an outlet pipe (10), and the outlet pipe (10) is provided with a first shut-off valve (11). A second shut-off valve (6) is connected to the sewage pipe (8).

6. The membrane filtration device with ultrasonic cleaning function according to claim 1, characterized in that: The filter plate (2012) is arranged in a ring shape, and a plurality of circumferentially spaced arc-shaped grooves (20121) are provided along the radial direction of the filter plate (2012), and the arc-shaped grooves (20121) are arranged in multiple rows along the height direction of the filter plate (2012); The filter membrane (2013) is annularly attached to the inner side of the filter plate (2012).

7. The membrane filtration device with ultrasonic cleaning function according to claim 6, characterized in that: The flow guiding layer (2011) includes a plurality of flow guiding plates arranged at intervals. The flow guiding plates are connected in a ring to the outside of the filter plate (2012). The flow guiding plate includes a connecting plate (20111) connected to the filter plate (2012), an inclined plate (20112) arranged at an upward angle, and a flap (20113) connected to the upper end of the inclined plate (20112). The flap (20113) is arranged in parallel with the connecting plate (20111).

8. The membrane filtration device with ultrasonic cleaning function according to claim 7, characterized in that: A flow gap (20114) is formed between two adjacent connecting plates (20111), and the two adjacent arc grooves (20121) of the flow gap (20114) are connected.

9. The membrane filtration device with ultrasonic cleaning function according to claim 8, characterized in that: The flow gap is provided with a zeolite molecular sieve membrane, the arc groove is provided with a carbon nanotube composite membrane, and the filter membrane (2013) is a graphene-modified polyvinylidene fluoride membrane.

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