A combined membrane filtration system suitable for high turbidity mine water

Abstract

The utility model discloses a kind of combined membrane filtration systems suitable for high turbidity mine water, belong to mine water filtration equipment technical field, including sewage cleaning device, series filter, membrane reaction vessel and sludge cone, wherein, sewage cleaning device is installed at the top of series filter, to remove large particle suspended solids and impurities and other insoluble substances in water body.In use, raw water is entered into series filter using inlet pipe, and is discharged into sludge pool through sewage pipe.Then these raw water is filtered outlet water port set in the side of series filter and enters into membrane reaction vessel.Secondary filtration is completed in the inside of membrane reaction vessel, and backflushing is carried out on membrane reaction vessel using backwashing device.On this basis, intermittent air release bubble flushing is carried out on membrane reaction vessel by aeration disc set in the bottom of membrane reaction vessel, to prevent suspended particles from blocking membrane holes, thereby improving the treatment efficiency of sewage, so that the equipment can be long time efficient operation.

Description

Technical Field

[0001] This utility model relates to the technical field of mine water filtration equipment, specifically to a combined membrane filtration system suitable for high-turbidity mine water. Background Technology

[0002] Coal mining, as an underground production activity, inevitably causes localized damage and pollution to underground aquifers. Therefore, a large amount of suspended solids often exist on the surface of mine water. These suspended solids are characterized by small particle size, low specific gravity, slow settling velocity, and poor coagulation effect. They also contain organic pollutants such as waste engine oil and emulsified oil.

[0003] For high-turbidity mine water, if traditional ultrafiltration treatment is used, the upstream of ultrafiltration needs to have processes such as coagulation sedimentation and multi-media filtration, which not only has a long process flow and low treatment efficiency, but also high overall energy consumption.

[0004] Currently, some direct filtration membrane devices for mine water have appeared on the market. Due to design flaws, a large amount of suspended solids will directly enter the membrane system, which will lead to membrane pore blockage and greatly reduce the overall water treatment capacity. They cannot meet the actual application requirements and are only suitable for water quality with suspended solids in the influent below 100 mg / L. Utility Model Content

[0005] Therefore, this utility model provides a combined membrane filtration system suitable for high turbidity mine water to solve the problem of reduced wastewater treatment efficiency caused by suspended solids clogging the membrane pores in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] The present invention discloses a combined membrane filtration system suitable for high-turbidity mine water, comprising:

[0008] Sewage and cleaning device with a water inlet pipe installed at the top;

[0009] A series filter is provided with a sewage discharge and cleaning device installed on top. The sewage discharge and cleaning device is inserted into the series filter at the bottom. A sewage discharge pipe is provided at the bottom of the series filter, and a valve is provided on the sewage discharge pipe. A filter outlet is provided on the side of the series filter.

[0010] The membrane reactor is connected to the filter outlet on its side. An ultrafiltration membrane frame is installed inside the membrane reactor, and an aeration disc is located below the ultrafiltration membrane frame. The aeration disc intermittently flushes the membrane frame with air bubbles to prevent suspended particles from clogging the membrane pores. The membrane reactor is connected to a backwashing device.

[0011] A sludge cone is located at the bottom of the membrane reactor. The bottom of the sludge cone has a sludge discharge port to periodically discharge the sludge deposited at the bottom.

[0012] Furthermore, the series filter includes:

[0013] The filter bucket has an outer side connected to the filter outlet and an internally installed series of filter elements.

[0014] A primary filter screen is located in the middle of the series filter elements, and a secondary filter screen is located at the bottom of the series filter elements. Raw water enters the filter tank after being filtered and intercepted by the primary and secondary filter screens to remove large suspended particles.

[0015] A central hole is disposed along the axis of the series filter elements and extends through the interior of the series filter elements, and the central hole is connected to the drain pipe.

[0016] Furthermore, the sewage cleaning device includes:

[0017] A cover is provided, and a power unit is mounted on top of it. The cover is sealed and positioned on top of the series filter.

[0018] The top of the hollow main shaft is coaxially connected to the power unit, and the bottom end passes through the central hole and is connected to the sewage pipe.

[0019] A separate steel brush is provided on the side of the hollow main shaft and is suitable for removing dirt attached to the primary filter and the secondary filter.

[0020] Among them, the hollow spindle It is equipped with two sewage outlets. The two drain outlets are connected to the drain pipe via a hollow main shaft, and the two drain outlets are respectively located above the primary filter screen and the secondary filter screen.

[0021] Furthermore, the sludge cone includes an air guide pipe, a cone-shaped hopper, and a drain valve. The bottom of the membrane reaction vessel is connected to the cone-shaped hopper, and a drain valve is provided at the bottom of the cone-shaped hopper.

[0022] An air guide pipe is provided on the side of the conical bucket. The air guide pipe is connected to an aeration disc, which is located inside the filter bucket and arranged below the ultrafiltration membrane frame.

[0023] Furthermore, the ultrafiltration membrane frame includes:

[0024] The mounting bracket has a composite ultrafiltration membrane suspended below it.

[0025] The base has a hollow structure to facilitate the passage of air bubbles, and a drainage pipe is provided at the upper end of the base. The drainage pipe passes through the center of the bracket and is connected to the backwashing device.

[0026] The composite ultrafiltration membrane is bag-shaped, and the opening of the composite ultrafiltration membrane is connected to the drainage tube.

[0027] Furthermore, the bracket has a spiral shape.

[0028] Furthermore, the backwashing device includes a backwashing pump and a three-way valve. The drain pipe is connected to the three-way valve, and the backwashing pump is installed on the three-way valve. When the backwashing pump is started, the backwashing pump drains clean water through the three-way valve into the drain pipe.

[0029] Furthermore, it also includes an electrical control box, which is electrically connected to the fan, the dosing pump, and the water inlet pump, respectively;

[0030] The water inlet pump is connected to the series filter via the water inlet pipe, the blower is connected to the aeration disc, and the dosing pump is connected to the membrane reaction vessel.

[0031] This utility model has the following advantages:

[0032] This utility model discloses a combined membrane filtration system suitable for high-turbidity mine water. The wastewater extraction device adopts a double-layer filtration structure design. By setting two self-cleaning filters with different pore sizes, it can quickly intercept more than 85% of suspended solids, greatly reducing the fouling and wear of the downstream composite membrane fibers by suspended solids in the influent. It has the advantages of resistance to wear from high suspended solids and long service life. At the same time, the aeration disc is used for aeration and intermittent bubble flushing of the membrane fibers, which can effectively prevent the problem of suspended particles clogging the membrane pores. Compared with the prior art, it can allow high-concentration suspended solids mine water to directly enter the combined membrane filtration system for treatment without designing coagulation and sedimentation processes. It has the advantages of simple process and high treatment efficiency, and solves the problem of reduced wastewater treatment efficiency due to suspended solids clogging the membrane pores in the prior art. Attached Figure Description

[0033] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0034] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0035] Figure 1 A perspective view of the combined membrane filtration system for high-turbidity mine water provided by this utility model;

[0036] Figure 2 A perspective view of the sewage discharge and cleaning device provided by this utility model;

[0037] Figure 3 A perspective view of the series filter provided by this utility model;

[0038] Figure 4 A three-dimensional view of the sludge cone provided by this utility model;

[0039] Figure 5 A perspective view of the ultrafiltration membrane frame provided by this utility model;

[0040] Figure 6 A perspective view of the backwashing device provided by this utility model;

[0041] Figure 7 A perspective view of the electrical control box connection diagram provided by this utility model;

[0042] In the diagram: 1. Sewage cleaning device; 11. Cover; 12. Power unit; 13. Hollow main shaft; 14. Split steel brush; 2. Sewage pipe; 3. Series filter; 31. Filter barrel; 32. Series filter element; 33. Primary filter screen; 34. Center hole; 35. Secondary filter screen; 4. Aeration disc; 5. Membrane reaction vessel; 6. Inlet pipe; 7. Sludge cone; 71. Air guide pipe; 71. Conical hopper; 73. Sewage valve; 8. Backwashing device; 81. Backwashing pump; 82. Three-way valve; 9. Ultrafiltration membrane frame; 91. Hanger; 92. Composite ultrafiltration membrane; 93. Base; 94. Drainage pipe; 10. Filter outlet; a1. Electrical control box; a2. Blower; a3. Dosing pump; a4. Inlet pump. Detailed Implementation

[0043] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0044] Please refer to this as well. Figures 1-7 This utility model discloses a combined membrane filtration system suitable for high turbidity mine water, which is mainly used to treat sewage in coal mining areas, thereby reducing the harm of mine sewage to the natural environment and facilitating resource recycling.

[0045] This utility model discloses a combined membrane filtration system suitable for high-turbidity mine water, comprising a wastewater cleaning device 1, a series filter 3, a membrane reaction vessel 5, and a sludge cone 7. Untreated raw water is stored in an equalization tank. An inlet pump a4 draws raw water and injects it into the series filter 3. The wastewater cleaning device 1 is installed on top of the series filter 3 to remove dirt from its surface and prevent sludge blockage. It also discharges wastewater and pre-treats it using the series filter 3 to remove large suspended solids and insoluble impurities. During operation, raw water enters the series filter 3 through the inlet pipe 6 installed on top of the wastewater cleaning device 1. Large suspended solids are intercepted and discharged into a sludge tank through the wastewater discharge pipe 2 at the bottom of the series filter 3. The wastewater discharge pipe 2 has at least one valve to prevent raw water leakage. Meanwhile, the pre-treated raw water, with a suspended solids concentration reduced by approximately 85%, enters the membrane reaction vessel 5 through the filter outlet 10 on the side of the series filter 3. Inside the membrane reaction vessel 5, an ultrafiltration membrane frame 9 is installed, and an aeration disc 4 is installed below the ultrafiltration membrane frame 9. The membrane reaction vessel 5 is connected to a backwashing device 8. The backwashing device 8 can be used to backwash the membrane reaction vessel 5, thereby keeping the surface of the ultrafiltration membrane frame 9 clean. At the same time, during the backwashing process, the aeration disc 4 will intermittently flush the membrane frame with air bubbles to prevent suspended particles from clogging the membrane pores.

[0046] In addition, a sludge cone 7 is provided at the bottom of the membrane reaction vessel 5, and the sludge deposited in the sludge cone 7 is discharged through the drain valve 73.

[0047] In a specific embodiment of this utility model, the series filter 3 includes a filter barrel 31, a series filter element 32, and a central hole 34. The outer side of the filter barrel 31 is connected to the water inlet pipe 6 so that raw water enters the series filter element 32 inside the filter barrel 31. It should be noted that the series filter element 32 is provided with a primary filter screen 33 and a secondary filter screen 35. The primary filter screen 33 is located in the middle of the series filter element 32, and the secondary filter screen 35 is located in the lower part of the series filter element 32. Furthermore, a central hole 34 is provided along the axis of the series filter element 32, penetrating the interior of the series filter element 32 and communicating with the sewage pipe 2. In this embodiment, the primary sewage inlet is connected to the interior of the primary filter screen. The pore size of the primary filter screen is greater than 50 μm, while the pore size of the secondary filter screen is less than 50 μm. Thus, raw water enters the filter barrel 31 through the primary filter screen 33 and the secondary filter screen 35, thereby filtering out coal slag or solid particles from the raw water through the series two-stage filtration structure.

[0048] In some embodiments, the sewage cleaning device 1 includes a cover 11, a hollow main shaft 13, and a split steel brush 14. A power unit 12 is mounted on the top of the cover 11, which is sealed to the top of the series filter 3 to prevent sewage leakage. The power unit 12 is coaxially connected to the hollow main shaft 13, and the split steel brush 14 is located on the side of the hollow main shaft 13. The power unit 12 drives the hollow main shaft 13 to rotate, which in turn drives the split steel brush 14 to rotate, thereby removing dirt attached to the primary filter screen 33 and the secondary filter screen 35. Furthermore, the split steel brush 14 contains two drain ports 15, which are connected to the sewage pipe 2 via the hollow main shaft 13, corresponding to the primary filter screen 33 and the secondary filter screen 35. Dirt or solid particles from the primary and secondary filters are discharged into the hollow main shaft 13 and then released into the sludge tank through the sewage pipe 2.

[0049] In some embodiments, since an ultrafiltration membrane frame 9 is provided inside the membrane reaction vessel 5, the pretreated wastewater entering the membrane reaction vessel 5 will enter the ultrafiltration membrane frame 9 from the outside to the inside. In this embodiment, a dosing pump a3 is also provided on the outside of the membrane reaction vessel 5. The dosing pump a3 is used to periodically add membrane cleaning agent into the membrane reaction vessel 5. The cleaning agent is mainly an acidic liquid such as citric acid, which is mainly used to dissolve the residual dirt on the composite ultrafiltration membrane 92, thereby keeping the membrane pores unobstructed.

[0050] In this embodiment, as Figure 5The ultrafiltration membrane module 9 includes a hanger 91, a composite ultrafiltration membrane 92, and a base 93. The hanger 91 is installed inside the membrane reaction vessel 5 and supported by the base 93. The composite ultrafiltration membrane 92 is hung below the hanger 91. The composite ultrafiltration membrane 92 is made of ultra-high molecular weight polyethylene, polyvinylidene fluoride, TiO2, etc., in a specific ratio. Testing shows that the membrane has a porosity of approximately 85%, an average pore size of 0.01–0.2 μm, and a pure water flux of 400 L per hour. Compared to similar products on the market, this composite membrane features a high flux of the inner membrane and a rigid, wear-resistant outer membrane, making it particularly suitable for the direct filtration of high-turbidity water. Furthermore, the composite ultrafiltration membrane 92 is bag-shaped, and the opening of the composite ultrafiltration membrane 92 is connected to the drainage pipe 94. The upper end of the base 93 is also provided with a drainage pipe 94. The drainage pipe 94 passes through the center of the hanger 91 and is connected to the backwashing device 8. Wastewater passes from the outside to the inside of the membrane reaction vessel 5 through the composite ultrafiltration membrane 92. After filtering out harmful substances, it is discharged into the water purification tank through the drainage pipe 94 and the backwashing device 8.

[0051] In some embodiments, such as Figure 6 The hanging bracket 91 has a vortex-shaped design, which improves space utilization and allows for the placement of more composite ultrafiltration membranes 92. On the other hand, the backwashing device 8 includes a backwashing pump 81 and a three-way valve 82. A drain pipe 94 is connected to the three-way valve 82, and the backwashing pump 81 is installed on the three-way valve 82. When the backwashing pump 81 starts, it drains clean water through the three-way valve 82 into the drain pipe 94. During normal water purification, the backwashing pump 81 does not start, and the filtered water flows directly into the water purification tank through the three-way valve 82.

[0052] In some embodiments, such as Figure 5 The sludge cone 7 includes an air guide pipe 71, a cone-shaped hopper 72, and a drain valve 73. Structurally, since the bottom of the membrane reactor 5 is connected to the cone-shaped hopper 72, the sludge and derivatives deposited in the membrane reactor 5 can be discharged outward through the drain valve 73 located at the bottom of the cone-shaped hopper 72. Furthermore, an aeration disc 4 is also installed inside the cone-shaped hopper 72, positioned below the ultrafiltration membrane frame 9. An air guide pipe 71 is located on the side of the cone-shaped hopper 73, connected to the aeration disc 4. The aeration disc 4 is located inside the filter tank 31 and positioned below the ultrafiltration membrane frame 9. Thus, compressed air can be injected into the aeration disc 4 through the air guide pipe 71 using a blower a2. Aeration also continuously agitates the composite ultrafiltration membrane 92, preventing suspended particles from adhering to the surface of the membrane fibers and causing blockage.

[0053] In one specific embodiment disclosed in this utility model, such as Figure 7It also includes an electrical control box a1, which is a programmable logic controller (PLC). The electrical control box a1 is electrically connected to the blower a2, the dosing pump a3, and the inlet pump a4. The inlet pump a4 draws raw water from the equalization tank and inputs it into the series filter 3 through the inlet pipe 6. The blower a2 is connected to the aeration disc 4, and the dosing pump a3 is connected to the membrane reactor 5. Furthermore, the electrical control box a1 can be programmed to use timers and interrupts to coordinate and alternately operate with the blower a2, the dosing pump a3, and the inlet pump a4, thereby achieving automatic operation of the equipment.

[0054] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A combined membrane filtration system suitable for high-turbidity mine water, characterized in that, include: Sewage cleaning device (1), with a water inlet pipe (6) installed on the top; A series filter (3) is installed on the top of the sewage cleaning device (1), the bottom of the sewage cleaning device (1) is inserted into the series filter (3), the bottom of the series filter (3) is provided with a sewage pipe (2), the sewage pipe (2) is provided with a valve, and the side of the series filter (3) is provided with a filter outlet (10). The membrane reaction vessel (5) is connected to the filter outlet (10) on the side. An ultrafiltration membrane frame (9) is installed inside the membrane reaction vessel (5). An aeration disc (4) is installed below the ultrafiltration membrane frame (9). The membrane reaction vessel (5) is connected to the backwashing device (8). A sludge cone (7) is set at the bottom of the membrane reaction vessel (5). During operation, the sludge cone (7) releases air bubbles intermittently through the aeration disc (4) to flush the membrane reaction vessel (5) to prevent suspended particles from clogging the membrane pores.

2. The combined membrane filtration system for high-turbidity mine water as described in claim 1, characterized in that, The series filter (3) includes: The filter bucket (31) is connected to the filter outlet (10) on the outside and has a series filter element (32) inside. A primary filter screen (33) is set in the middle of the series filter element (32), and a secondary filter screen (35) is set at the lower part of the series filter element (32). The raw water enters the filter tank (31) after passing through the primary filter screen (33) and the secondary filter screen (35). A central hole (34) is disposed along the axis of the series filter element (32) and through the interior of the series filter element (32). The central hole (34) is connected to the drain pipe (2).

3. The combined membrane filtration system for high-turbidity mine water as described in claim 2, characterized in that, The sewage cleaning device (1) includes: A cover (11) is provided, with a power unit (12) mounted on top. The cover (11) is sealed on top of the series filter (3). The top end of the hollow spindle (13) is coaxially connected to the power machine (12), and the bottom end passes through the central hole (34) and is connected to the sewage pipe (2); A split steel brush (14) is provided on the side of the hollow main shaft (13) and is adapted to remove dirt attached to the primary filter screen (33) and the secondary filter screen (35); The hollow main shaft (13) is provided with two drain ports (15), which are connected to the drain pipe (2) through the hollow main shaft (13), and the two drain ports (15) are located above the primary filter screen (33) and the secondary filter screen (35), respectively.

4. The combined membrane filtration system for high-turbidity mine water as described in claim 3, characterized in that, The sludge cone (7) includes an air guide pipe (71), a cone (72) and a drain valve (73). The bottom of the membrane reaction vessel (5) is connected to the cone (72), and the bottom of the cone (72) is provided with a drain valve (73). The conical bucket (72) is provided with an air guide pipe (71) on its side. The air guide pipe (71) is connected to the aeration disc (4). The aeration disc (4) is located inside the filter bucket (31) and arranged below the ultrafiltration membrane frame (9).

5. The combined membrane filtration system for high-turbidity mine water as described in claim 1, characterized in that, The ultrafiltration membrane frame (9) includes: A hanging rack (91) is provided with a composite ultrafiltration membrane (92) hanging below it. The base (93) has a hollow structure and a drainage pipe (94) is provided at the upper end. The drainage pipe (94) passes through the center of the bracket (91) and is connected to the backwashing device (8). The composite ultrafiltration membrane (92) is bag-shaped, and the opening of the composite ultrafiltration membrane (92) is connected to the drainage tube (94).

6. The combined membrane filtration system for high-turbidity mine water as described in claim 5, characterized in that, The hanger (91) is vortex-shaped.

7. The combined membrane filtration system for high-turbidity mine water as described in claim 5, characterized in that, The backwashing device (8) includes a backwashing pump (81) and a three-way valve (82). The drain pipe (94) is connected to the three-way valve (82). The backwashing pump (81) is installed on the three-way valve (82). When the backwashing pump (81) is started, the backwashing pump (81) drains clean water through the three-way valve (82) into the drain pipe (94).

8. The combined membrane filtration system for high-turbidity mine water as described in claim 1, characterized in that, It also includes an electrical control box (a1), which is electrically connected to the blower (a2), the dosing pump (a3) ​​and the water inlet pump (a4); The water inlet pump (a4) is connected to the series filter (3) through the water inlet pipe (6), the blower (a2) is connected to the aeration disc (4), and the dosing pump (a3) ​​is connected to the membrane reaction vessel (5).

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