A corrugated plate-shaped ceramic filter membrane

Abstract

The present invention is applicable to the field of ceramic membrane separation technology, and provides a corrugated plate-shaped ceramic filter membrane. By setting a water pipe and a filter membrane layer, the top and bottom of the water pipe both have a depression formed by the depression in the middle of the water pipe, which can effectively increase the filtration area of ​​the ceramic membrane. The interior of the water pipe has a water channel with an I-shaped structure. The water pipe is provided with at least two and arranged in parallel in sequence along the width direction of the water pipe. Adjacent water pipes are connected by a cross-connecting part. The hollow inner cavity formed by the corrugated design has a relatively large channel, which is convenient for dredging and cleaning of pollutants in the channel. The cross-connecting part can enhance the mechanical structural strength between adjacent water pipes. The outer surface of the water pipe is coated with a filter membrane layer. The present invention has a large effective filtration area, high mechanical strength, low risk of rupture during use, and has the advantages of easy dredging and cleaning of the water channel.

Description

Technical Field

[0001] The invention belongs to the technical field of ceramic membrane separation, and in particular relates to a corrugated plate-shaped ceramic filter membrane. Background Art

[0002] Decentralized integrated membrane bioreactor (MBR) has also become the main process and equipment for rural sewage treatment. The core component of this process is a porous membrane that can separate activated sludge from water. The porous separation membrane with a relatively high market share is mainly polyvinylidene fluoride (PVDF) curtain membrane. The membrane product has a simple manufacturing process and is cheap, so it is favored by major domestic engineering companies. However, the chemical structure of PVDF material determines that its product is relatively hydrophobic, so it is easy to cause membrane clogging during use, and the water output does not meet the engineering design requirements. What is more fatal is that this curtain membrane needs aeration to flush the pollutants on its surface during operation, so it will always swing in the muddy water, and it is easy to break the wire over time, resulting in turbid water. Ceramic membranes are widely used in special separation, chemical production and wastewater treatment due to their high mechanical strength, acid and alkali resistance, high temperature resistance, good chemical stability, resistance to organic solvents, good regeneration performance, simple separation process, low energy consumption, easy operation and maintenance, and long service life. In particular, flat ceramic membranes are gradually being widely used in MBR processes because of their good hydrophilicity, long life, high mechanical strength, large permeation flux, and the ability to implement backwashing and chemical regeneration and cleaning with strong acids and alkalis.

[0003] The ceramic membranes currently used in the MBR process are mainly flat. The common membrane sizes are 1000mm long, 250mm wide and 6mm thick, and 500mm long, 110mm wide and 6mm thick. There is a 3mm*3mm square hole or a 3mm diameter round hole in the middle of the plate as a permeate water channel. Due to the large size effect of this thin-walled and large-sized ceramic plate, it is very difficult to control the flatness and regularity of this ceramic plate during the manufacturing process, and it is easy to crack and warp. During use, the effective filtration area is two planes, resulting in a small filtration area. It is necessary to increase the permeate flux by high packing density, resulting in a small spacing between the two plates, and mud is prone to occur during operation. This mud will result in the disadvantage of low permeate flux, and even the mud is prone to expansion, causing this ceramic flat membrane to be often broken. In addition, there is this kind of 3mm*3mm square hole or 3mm diameter round hole as the water channel. Once the membrane ruptures, the backwash pump will pump the activated sludge leaking from the rupture into the water channels of all membranes, seriously blocking the substrate of the flat ceramic membrane, causing serious membrane flux attenuation, and there is no way to clean the mud in the 3mm*3mm square hole or 3mm diameter round hole, which will directly cause the entire membrane system to be scrapped. Therefore, this kind of flat ceramic membrane with a square hole or a round hole in the center of the water channel and two flat sides has a low effective filtration area, poor mechanical strength of the entire membrane, and is prone to rupture and scrapping. The technical requirements for manufacturing are high, the flatness and regularity of the membrane are poor, and it is easy to have problems such as firing cracking and warping. Summary of the invention

[0004] The present invention provides a corrugated plate-shaped ceramic filter membrane, which has a large filtration area, high mechanical strength, no possibility of being cracked by expanded sludge, no risk of pollutants not being able to be cleaned out of the water conducting channels, small size effect, and low manufacturing technology difficulty. It is a very novel, strong and durable ceramic plate membrane.

[0005] The present invention is implemented as follows: a corrugated plate-shaped ceramic filter membrane comprises a water guide pipe and a filter membrane layer;

[0006] The top and bottom of the water pipe each have a concave portion formed by a depression in the middle of the water pipe; the interior of the water pipe has a water channel with an I-shaped structure;

[0007] At least two water pipes are provided and are arranged in parallel in sequence along the width direction of the water pipes, and adjacent water pipes are connected by a cross connection part;

[0008] The outer surface of the water conduit is coated with the filter membrane layer.

[0009] Preferably, the distance between the lowest point and the highest point of the recessed portion is not less than 0.1 mm.

[0010] Preferably, the top and the bottom of the cross-connection portion each have a V-shaped groove, and the bottom of the groove is a rounded transition.

[0011] Preferably, the material of the water conduit is one or more composite ceramics selected from the group consisting of aluminum oxide, titanium oxide, zirconium oxide, silicon oxide, silicon carbide, cordierite, mullite and silicon carbide.

[0012] Preferably, it also includes a slide and a cleaning brush;

[0013] The slide frame includes two clamping plates and a top plate connecting the two clamping plates, the clamping plates are clamped on both side edges of the at least two water pipes and are slidably connected to the water pipes, and there is a gap between the top plate and the upper surface of the water pipes for accommodating the cleaning brush;

[0014] The cleaning brush is fixedly connected to the top plate and is closely attached to the upper surface of the water conduit.

[0015] Preferably, the bottom of the cleaning brush has at least two raised portions 1 matching the recessed portion, and the raised portions 1 are in close contact with the inner wall of the recessed portion;

[0016] The bottom of the cleaning brush has at least one protrusion 2 matching the groove, and the protrusion 2 is in close contact with the inner wall of the groove.

[0017] Preferably, the top plate has at least one finger groove.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: a corrugated plate-shaped ceramic filter membrane of the present invention, by providing a water pipe and a filter membrane layer, the top and bottom of the water pipe both have a depression formed by a depression in the middle of the water pipe, which can effectively increase the filter area of ​​the ceramic membrane. The interior of the water pipe has a water channel with an I-shaped structure. The water pipe is provided with at least two and arranged in parallel in sequence along the width direction of the water pipe, and adjacent water pipes are connected by a cross-connecting part. The hollow inner cavity formed by the corrugated design has a relatively large channel, which is convenient for dredging and cleaning of pollutants in the channel. The cross-connecting part can enhance the mechanical structural strength between adjacent water pipes. The outer surface of the water pipe is coated with a filter membrane layer. The present invention has a large effective filtration area, high mechanical strength, low risk of rupture during use, and has the advantages of easy dredging and cleaning of the water channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an overall front view of the present invention.

[0020] Figure 2 It is a structural schematic diagram of the water conduit of the present invention.

[0021] Figure 3 It is a front view of the slide and the brush of the present invention.

[0022] In the figure: 1-water pipe, 2-depression, 3-water channel, 4-filtration membrane layer, 5-cross connection part, 6-slide, 61-clamp, 62-top plate, 63-finger groove, 7-brush, 71-protrusion one, 72-protrusion two. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] Example 1

[0025] See also Figure 1-3 This embodiment provides a technical solution: a corrugated plate-shaped ceramic filter membrane, including a water pipe 1 and a filter membrane layer 4.

[0026] The top and bottom of the water pipe 1 are both provided with a depression 2 formed by the depression in the middle of the water pipe 1; the interior of the water pipe 1 is provided with a water channel 3 of an I-shaped structure. The depression 2 is a U-shaped structure, and the edge of the bottom wall is a rounded transition. By designing a water channel of an I-shaped structure, a large flux of water can be conducted, and the ceramic diaphragm can conduct water without obstacles and head loss. In addition, the channel of the hollow inner cavity formed by this corrugated design is relatively large, which is convenient for dredging and cleaning of pollutants in the channel.

[0027] Six water pipes 1 are provided and arranged in parallel in sequence along the width direction of the water pipes 1, and adjacent water pipes 1 are connected by a cross connection part 5. The top and bottom of the cross connection part 5 each have a V-shaped groove, and the bottom of the groove is a rounded transition. The recessed parts 2 of the six water pipes 1 form a concave-convex corrugated surface, replacing the original flat surface. The distance between the lowest point and the highest point of the recessed part 2, that is, the distance between the crest and the trough is not less than 0.1 mm, which can effectively increase the filtration area of ​​the ceramic membrane.

[0028] The water conduit 1 and the cross-connection part 5 are integrally formed, and the cross-connection part 5 provides a support point for the hollow inner cavity of the entire corrugated plate, thereby significantly improving the mechanical strength of the entire membrane.

[0029] The outer surface of the water pipe 1 is coated with a filter membrane layer 4, which is made of ceramic particles with more attractive particles. The separation membrane has a high pore size concentration, slow membrane pollution decay, and a stable membrane permeation flux.

[0030] The material of the water pipe 1 can be one or more composite ceramics selected from the group consisting of aluminum oxide, titanium oxide, zirconium oxide, silicon oxide, silicon carbide, cordierite, mullite and silicon carbide.

[0031] In order to facilitate cleaning of the outer surface of the water pipe 1, a slide 6 and a cleaning brush 7 are also provided. The slide 6 includes two clamping plates 61 and a top plate 62 connecting the two clamping plates 61. The clamping plates 61 are clamped on the two side edges of at least two water pipes 1 and are slidably connected to the water pipes 1. There is a gap between the top plate 62 and the upper surface of the water pipe 1 to accommodate the cleaning brush 7. The cleaning brush 7 is fixedly connected to the top plate 62 and is in close contact with the upper surface of the water pipe 1. The user can slide the slide 6 to drive the cleaning brush 7 to move on the outer surface of the water pipe 1 to clean the outer surface of the water pipe 1.

[0032] The bottom of the cleaning brush 7 has six raised parts 71 matching the recessed part 2, and the raised parts 71 are close to the inner wall of the recessed part 2. The bottom of the cleaning brush 7 has five raised parts 72 matching the groove, and the raised parts 72 are close to the inner wall of the groove. The raised parts 71 and 72 can clean the recessed part 2 and the groove respectively, and the cleaning effect is good.

[0033] The top plate 62 has two finger grooves 63. The user can insert fingers into the finger grooves 63 to move the slide 6, which is easy to operate.

[0034] The preparation method of the ceramic filter membrane of the present invention is as follows: one or more composite ceramic powders selected from alumina, titanium oxide, zirconium oxide, silicon oxide, silicon carbide, cordierite, mullite and silicon carbide are dry-mixed uniformly by adding sintering aids, binders, pore-forming agents, dispersants, lubricants and solvents, and then wet-mixed, kneaded, roughly smelted, aged and refined; then the designed corrugated extrusion die is installed on a vacuum twin-screw extruder or a vacuum hydraulic extruder to extrude the corrugated plate-shaped substrate membrane, the length and width of which can be designed according to actual use conditions; then the wet mud blank is quickly shaped by microwave or shaped by moisturizing drying, fully dried and dehydrated in an oven, and then placed in a kiln for high-temperature sintering to obtain the concave-convex corrugated plate-shaped ceramic substrate; finally, a layer of ceramic powder with finer particles and a small amount of sintering aid is coated on the corrugated plate surface by a spraying or dipping process, and then placed in a kiln for high-temperature sintering again to obtain the corrugated plate-shaped ceramic membrane product with filtering performance.

[0035] Example 2

[0036] This embodiment applies the ceramic filter membrane provided in the first embodiment to the MBR integrated sewage treatment equipment and is specifically implemented in a rural domestic sewage treatment project in Jiangsu Province.

[0037] The effect is that it has been running for about six months so far, the water flux is stable, the water quality meets the standards, and there has never been any membrane cracking or membrane leakage.

[0038] In summary, a corrugated plate-shaped ceramic filter membrane of the present invention, by providing a water pipe 1 and a filter membrane layer 4, the top and bottom of the water pipe 1 are both provided with a recessed portion 2 formed by a recess in the middle of the water pipe 1, which can effectively increase the filtration area of ​​the ceramic membrane. The interior of the water pipe 1 has a water channel 3 of an I-shaped structure. The water pipe 1 is provided with at least two and arranged in parallel in sequence along the width direction of the water pipe. Adjacent water pipes 1 are connected by a cross-connection portion 5. The hollow inner cavity formed by the corrugated design has a relatively large channel, which is convenient for dredging and cleaning of pollutants in the channel. The cross-connection portion 5 can enhance the mechanical structural strength between adjacent water pipes 1. The outer surface of the water pipe 1 is coated with a filter membrane layer 4. The present invention has a large effective filtration area, high mechanical strength, and a low risk of rupture during use, and has the advantages of easy dredging and cleaning of the water channel 3.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A corrugated plate-shaped ceramic filter membrane, characterized in that: The invention comprises a water pipe (1) and a filter membrane layer (4); the top and bottom of the water pipe (1) each have a recessed portion (2) formed by a recess in the middle of the water pipe (1); the interior of the water pipe (1) has a water channel (3) with an I-shaped structure; the water pipe (1) is provided with at least two water pipes (1) arranged in parallel in sequence along the width direction of the water pipe (1), and adjacent water pipes (1) are connected via a cross-connecting portion (5); the outer surface of the water pipe (1) is coated with the filter membrane layer (4); the distance between the lowest point and the highest point of the recessed portion (2) is not less than 0.1 mm; the top and bottom of the cross-connecting portion (5) each have a V-shaped groove, and the bottom of the groove is a rounded transition.

2. A corrugated plate-shaped ceramic filter membrane as claimed in claim 1, characterized in that: The material of the water conduit (1) is one or more composite ceramics selected from the group consisting of aluminum oxide, titanium oxide, zirconium oxide, silicon oxide, cordierite, mullite and silicon carbide.

3. A corrugated plate-shaped ceramic filter membrane as claimed in claim 2, characterized in that: It also comprises a slide (6) and a cleaning brush (7); the slide (6) comprises two clamping plates (61) and a top plate (62) connecting the two clamping plates (61); the clamping plates (61) are clamped on the two side edges of the at least two water pipes (1) and are slidably connected to the water pipes (1); a gap for accommodating the cleaning brush (7) is provided between the top plate (62) and the upper surface of the water pipe (1); the cleaning brush (7) is fixedly connected to the top plate (62) and is in close contact with the upper surface of the water pipe (1).

4. A corrugated plate-shaped ceramic filter membrane as claimed in claim 3, characterized in that: The bottom of the cleaning brush (7) has at least two raised portions (71) matching the recessed portion (2), and the raised portions (71) are in close contact with the inner wall of the recessed portion (2); the bottom of the cleaning brush (7) has at least one raised portion (72) matching the groove, and the raised portion (72) is in close contact with the inner wall of the groove.

5. A corrugated plate-shaped ceramic filter membrane as claimed in claim 4, characterized in that: The top plate (62) has at least one finger groove (63).

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