CN110652880B - Membrane filtration unit and flat membrane element - Google Patents
Membrane filtration unit and flat membrane element Download PDFInfo
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- CN110652880B CN110652880B CN201910966972.9A CN201910966972A CN110652880B CN 110652880 B CN110652880 B CN 110652880B CN 201910966972 A CN201910966972 A CN 201910966972A CN 110652880 B CN110652880 B CN 110652880B
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- filtration unit
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/08—Flat membrane modules
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
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- Hydrology & Water Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to the technical field of water treatment equipment, and particularly relates to and discloses a membrane filtration unit. The membrane filtration unit is provided with a plurality of water collecting pipes, the water collecting pipes are axially parallel or perpendicular to the membrane filtration unit, the water collecting pipes are positioned on the left side and the right side of the membrane filtration unit, water producing openings are formed in the tops of the two sides or one side of each water collecting pipe, sewage penetrates through the filtration membrane, is guided into the water collecting pipes through the guide cloth and is guided out through the water producing openings, and solid-liquid separation is realized. The membrane filtration unit and the flat-plate membrane element have the foldable membrane structure capable of stretching and shaking, so that the filtration area of unit volume is increased, the filling density is improved, sludge deposition can be effectively prevented, and backwashing of the membrane is realized.
Description
Technical Field
The invention relates to the technical field of water treatment equipment, in particular to a membrane filtration unit and a flat membrane element.
Background
The membrane bioreactor combines a membrane separation technology and a biological treatment technology, and a membrane component replaces a traditional secondary sedimentation tank to realize high-efficiency solid-liquid separation, and simultaneously, the concentration of activated sludge in the reactor is improved, and the quality of effluent is improved. The flat membrane has flat surface and wide flow channel, and the air-water mixed liquid and the water flow shearing force act on the surface in the aeration process, so that the pollutant can be prevented from being deposited. But traditional dull and stereotyped membrane uses the ABS plastic slab as the backup pad, and its thickness has restricted the packing density of dull and stereotyped membrane greatly at 5.5~6 mm. Meanwhile, the plastic support plate is high in manufacturing cost, membrane elements are not easy to shake in the using process, the cleaning of the membrane surface is not facilitated, and the flat membrane can be blocked in the past to influence the effluent quality.
Patent 201821065174.6 is in order to solve the problem that the plank (diaphragm plate or guide plate) of the dull and stereotyped membrane element of MBR is heavy, the consumption is big and with high costs, adopts plate frame and netted backup pad to constitute the backup pad of membrane element, and wherein netted backup pad material is engineering plastics, and the net silk diameter is 5-6mm, though reduced material cost and installation bearing, membrane element thickness does not reduce, and dull and stereotyped membrane packing density is waited to improve. Patent 201810078355.0 discloses a flexible PVDF flat membrane as a membrane stack, wherein aeration is performed below the membrane stack through an aeration pipe, so that the flexible flat membrane can keep a shaking state under the action of aeration, but the shaking range of the membrane is still limited.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a membrane filtration unit which can be cleaned in a shaking way, has high filling density and can realize backwashing, and a flat membrane element using the membrane filtration unit.
In order to achieve the purpose, the invention adopts the following technical scheme:
the membrane filtration unit comprises two layers of filtration membranes and flow guide cloth positioned between the two layers of filtration membranes, wherein the filtration membranes and the flow guide cloth are folded together to form a plurality of axially parallel pleats, and the pleats form a corrugated structure capable of radially stretching. The filtering area of the unit volume of the structure can be increased by 2-4 times, the space utilization rate is effectively improved, and the filling density is improved; and when the membrane element using the membrane filtering unit is arranged in an aeration environment, the membrane continuously swings under the action of air flow flushing, so that sludge deposition can be effectively prevented, and meanwhile, the thickness of the membrane element is effectively reduced by adopting the soft flow guide cloth to guide water flow.
Preferably, the cross section is saw-toothed, and the height of the upper edge and the lower edge of each saw tooth is 1.0-10.0 mm. The manufacturing is convenient, the structure is stable, the space utilization rate can be effectively improved, the swing is easier, and better filling density can be achieved.
Preferably, the fold of the pleat is provided with a reinforcing rib. The reinforcing ribs can be evenly distributed on the surface of the filter membrane, and can also be arranged at the bent parts of the pleats. The reinforcing ribs are additionally arranged to increase the strength, so that the back washing of the flat membrane can be realized, the volume expansion of the inner cavity of the filtering membrane is prevented, and the deformation of the membrane element and the expansion and damage of the filtering bag are avoided.
The flat membrane element comprises first water collecting pipes, wherein the first water collecting pipes are positioned on the left side and the right side of the membrane filtering unit and are axially parallel to pleats, two ends of the membrane filtering unit are respectively encapsulated in the left first water collecting pipe and the right first water collecting pipe, the number of the membrane filtering units is more than or equal to 1, water generating ports are arranged on the two sides or the top of one side of each first water collecting pipe, and the top and the bottom of the membrane filtering unit are sealed by ultrasonic waves, hot melting or epoxy resin. Preferably, the top of one side of the first water collecting pipe is provided with a water producing port. The number of the membrane filtration units can be 6-20, preferably 10-15. The diaphragm packaged in the left and right first water collecting pipes is not blocked, and permeate in the diaphragm cavity enters the first water collecting pipes and is output through a water producing port at the top of the first water collecting pipe fitting. A plurality of membrane filtration units share one water production port, so that the pipeline connection times can be reduced, and the membrane elements can be conveniently installed and overhauled.
Preferably, the cross section of the water collecting pipe is U-shaped, the side ends of the membrane filtering units are sealed at the U-shaped opening, and the membrane filtering units are arranged in front of and behind each other. The arrangement increases the packing density per unit area and facilitates the sharing of the water producing port.
The utility model provides a dull and stereotyped membrane element, uses aforementioned membrane filtration unit, includes second collector pipe, water collecting hole, and water collecting hole opens the both sides at membrane filtration unit to run through filtration membrane and water conservancy diversion cloth, it has a plurality of outage to open on the second collector pipe, and the second collector pipe passes water collecting hole, and the outage communicates with the play water of filtration membrane, and filtration membrane and water conservancy diversion cloth around the water collecting hole seal to the second collector pipe, and a plurality of membrane filtration unit tandem. The structure is beneficial to water collection and water production, and the second water collecting pipes with different lengths can be selected to be installed according to the number of the membrane filtering units, so that the adaptability is strong. The water collection holes may be circular, rectangular, diamond-shaped or triangular, preferably circular.
Preferably, the water collecting holes are formed at four corners of the membrane filtering unit. The second collector pipe passes through filtration diaphragm and water conservancy diversion cloth through the water collecting hole, can also support fixedly simultaneously the membrane element.
Preferably, the periphery thereof is sealed by ultrasonic, hot melt, or epoxy. Effectively preventing sewage from entering the membrane cavity.
Preferably, the pleats of the membrane filtration unit have the same left-right spacing, and the pleat upper edges are aligned with the pleat lower edges of the adjacent membrane filtration units. The upper edge and the lower edge of the adjacent membrane filtration units are arranged in a tip-to-tip manner, and enough space is reserved for preventing the adjacent membrane filtration units from being adhered to each other under the condition of aeration disturbance.
Preferably, the pleats of the membrane filtration units have the same left-right spacing, the pleats of adjacent membrane filtration units are aligned, and the support fixing lines are penetrated between the pleats of the same membrane filtration unit. The arrangement mode can more effectively utilize space, and the supporting and fixing lines can fix the membranes, maintain the space between the membrane filtering units and prevent the adjacent membrane filtering units from being bonded.
The membrane filtration unit and the flat-plate membrane element have the foldable membrane structure capable of stretching and shaking, so that the filtration area of unit volume is increased, the filling density is improved, sludge deposition can be effectively prevented, and backwashing of the membrane is realized.
Drawings
Fig. 1 is a schematic structural view of a membrane filtration unit according to example 1 of the present invention.
Fig. 2 is a schematic cross-sectional view of fig. 1.
Fig. 3 is a schematic structural view of a flat membrane element in example 1 of the present invention.
Fig. 4 is a cross-sectional view AA of fig. 3.
Fig. 5 is a schematic structural view of a flat membrane element in example 2 of the present invention.
Fig. 6 is a cross-sectional view AA of fig. 5.
Fig. 7 is a schematic structural view of a flat membrane element according to example 3 of the present invention.
Fig. 8 is a cross-sectional view AA of fig. 7.
Fig. 9 is a schematic structural view of a flat membrane element according to example 4 of the present invention.
Fig. 10 is a cross-sectional view AA of fig. 9.
In figure 1, a filter membrane; 2. flow guiding cloth; 3. a membrane filtration unit; 4. a first header pipe; 5. a water producing port; 6. reinforcing ribs; 7. supporting the fixed wire; 8. a water collection hole; 9. a second header pipe; 10. a seal member; 11. a drain hole; 12. and (4) pleating.
Detailed Description
The invention will be further described with reference to fig. 1-10 and the detailed description.
Example 1
A membrane filtration unit, as shown in attached figures 1 and 2, comprises two layers of filtration membranes 1 and a guide cloth 2 positioned between the two layers of filtration membranes 1, wherein the filtration membranes 1 and the guide cloth 2 are folded together to form a plurality of axially parallel pleats 12, the pleats 12 form a corrugated structure capable of radially stretching and contracting, the cross section of the corrugated structure is in a sawtooth shape, and the height of the upper edge and the lower edge of the sawtooth is 10.0 mm. When the membrane filter unit is naturally unfolded, the axial height of the membrane filter unit is 1m, the width of the membrane filter unit is 0.5m, and the filter area is 2-4m2。
A flat membrane element, as shown in the attached figures 3 and 4, uses the above membrane filtration unit 3, and the bending part of the pleat 12 is provided with a reinforcing rib 6, and further comprises a first water collecting pipe 4, the first water collecting pipe 4 is positioned at the left and right sides of the membrane filtration unit 3, and is axially parallel to the pleat 12, the two side ends of the membrane filtration unit 3 are respectively packaged in the left and right first water collecting pipes 4, the number of the membrane filtration units 3 is 12, the top of the single side of the first water collecting pipe 4 is provided with a water producing port 5, and the top and the bottom of the membrane filtration unit 3 are ultrasonically sealed.
The cross section of the first water collecting pipe 4 is U-shaped, the side ends of the membrane filtering units 3 are sealed at the U-shaped openings, the left and right intervals of the pleats of the membrane filtering units 3 are the same, and the upper edges of the pleats are aligned with the lower edges of the pleats of the adjacent membrane filtering units. The lower edge of the pleat is aligned with the upper edge of the pleat of the adjacent membrane filtration unit. The 12 membrane filtration units 3 form a front and back tip-to-tip arrangement.
The water producing port 5 can be connected to a water producing pool through a hose, sewage can penetrate through the filtering membrane 1 and is guided to the water collecting pipe 4 through the guide cloth 2 under the negative pressure suction effect of the suction pump, and the sewage enters the water producing pool through the water producing port 5, so that the penetrating fluid is pumped out of the membrane element, and the purpose of solid-liquid separation is achieved.
The membrane element is arranged in a sewage tank with aeration at the bottom, the aeration drives the filtering membrane 1 of the membrane filtering unit 3 to vibrate, and the gas-liquid mixture generates shearing force on the surface of the filtering membrane 1, so that particles such as sludge can be effectively prevented from being accumulated on the surface of the membrane. When the membrane 1 is backwashed, the membrane element is not easy to deform and the filter bag is not easy to expand and break due to the existence of the reinforcing ribs 6.
Example 2
The structure of the membrane filtration unit 3 and other parts of the flat membrane element are the same as in example 1, as shown in figures 5 and 6, except that: the pleats 12 of adjacent membrane filtration units 3 are aligned at the upper edge and aligned at the lower edge, and the support fixing thread 7 is penetrated between the pleats 12 of the same membrane filtration unit 3. The support fixing wire 7 is provided at the bottom of the membrane filtration unit 3. The supporting and fixing lines 7 can fix the membrane sheets, maintain the space between the membrane filtering units and prevent the adjacent membrane filtering units from being bonded.
Example 3
The structure of the membrane filtration unit 3 is otherwise the same as in example 1, as shown in fig. 7, except that: four corners of the membrane filtration unit 3 are provided with water collecting holes 8, the water collecting holes 8 are opened into circular through holes in the embodiment and penetrate through the filtration membrane 1 and the flow guide cloth 2, and the sealing element 10 is sleeved on the water collecting holes 8.
A flat membrane element, as shown in figure 8, uses the above membrane filtration unit 3, also includes a second water collecting pipe 9, the second water collecting pipe 9 is provided with a plurality of liquid discharge holes 11, the second water collecting pipe 9 passes through the water collecting holes 8, the liquid discharge holes 11 are communicated with the outlet water of the filtration membrane 1, the filtration membrane 1 and the flow guide cloth 2 around the water collecting holes 8 are sealed on the second water collecting pipe 9 by a sealing member 10, 12 membrane filtration units 3 are arranged in front and back. The pleats of the membrane filtration unit 3 have the same left-right pitch, and the upper edge of the pleat is aligned with the lower edge of the pleat of the adjacent membrane filtration unit. The lower edge of the pleat is aligned with the upper edge of the pleat of the adjacent membrane filtration unit. The 12 membrane filtration units 3 form a front and back tip-to-tip arrangement.
The water collecting pipe fitting of the flat membrane element has the function of supporting and fixing the membrane element.
The periphery of the flat membrane element is sealed by sealant. The sealing compound here is a hot-melt seal.
Example 4
The structure of the membrane filtration unit 3 and the other structures of the flat-plate membrane elements are the same as those of the embodiment 3, as shown in the attached figures 9 and 10, except that: the pleats 12 of adjacent membrane filtration units 3 are aligned at the upper edge and aligned at the lower edge, and the support fixing thread 7 is penetrated between the pleats 12 of the same membrane filtration unit 3. The support fixing wire 7 is provided at the bottom of the membrane filtration unit 3. The supporting and fixing lines 7 can fix the membrane sheets, maintain the space between the membrane filtering units and prevent the adjacent membrane filtering units from being bonded.
The periphery of the flat membrane element is sealed by sealant. The sealing compound here is a hot-melt seal.
In summary, the present invention is only a preferred embodiment, and is not intended to limit the scope of the invention, and all equivalent changes and modifications made in the content of the claims should be considered as the technical scope of the invention.
Claims (8)
1. The utility model provides a membrane filtration unit, includes two-layer filtering membrane (1) and is located water conservancy diversion cloth (2) between two-layer filtering membrane (1), its characterized in that: the filtering membrane (1) and the flow guide cloth (2) are folded together to form a plurality of axially parallel pleats (12), reinforcing ribs (6) are arranged at the bending positions of the pleats (12) and the surface of the filtering membrane (1), supporting and fixing lines (7) penetrate between the pleats (12), and the pleats (12) form a corrugated structure capable of radially stretching.
2. A membrane filtration unit according to claim 1, wherein: the cross section is zigzag, and the height of the upper edge and the lower edge of the sawtooth is 1.0-10.0 mm.
3. A flat sheet membrane element using the membrane filtration unit of claim 1 or 2, wherein: the membrane filtration device comprises first water collecting pipes (4), wherein the first water collecting pipes (4) are located on the left side and the right side of a membrane filtration unit (3) and are axially parallel to pleats (12), the two side ends of the membrane filtration unit (3) are respectively packaged into the left first water collecting pipe and the right first water collecting pipe (4), the number of the membrane filtration unit (3) is more than or equal to 1, water producing ports (5) are arranged on the two sides or the top of one side of the first water collecting pipe (4), and the top and the bottom of the membrane filtration unit (3) are sealed by ultrasonic waves, hot melt or high polymer adhesives.
4. A flat sheet membrane element according to claim 3, wherein: the cross section of the first water collecting pipe (4) is U-shaped, the side ends of the membrane filtering units (3) are sealed at the U-shaped opening, and the membrane filtering units (3) are arranged in front and back.
5. A flat sheet membrane element using the membrane filtration unit of claim 1 or 2, wherein: including second collector pipe (9), at least two hole (8) catchments, hole (8) catchments are opened on the both sides of membrane filtration unit (3), and run through filtration diaphragm (1) and water conservancy diversion cloth (2), it has a plurality of outage (11) to open on second collector pipe (9), second collector pipe (9) pass hole (8) catchments, outage (11) and the play water intercommunication of filtration diaphragm (1), filtration diaphragm (1) and water conservancy diversion cloth (2) around hole (8) catchment are sealed on second collector pipe (9), a plurality of membrane filtration unit (3) tandem arrangement, dull and stereotyped film element is sealed by ultrasonic wave, hot melt or polymer adhesive all around.
6. A flat sheet membrane element according to claim 5, wherein: the water collecting holes (8) are formed in four corners of the membrane filtering unit (3).
7. A flat sheet membrane element according to any of claims 3 to 6, wherein: the left and right intervals of the pleats (12) of the membrane filtration unit (3) are the same, and the upper edge of each pleat (12) is aligned with the lower edge of the pleat (12) of the adjacent membrane filtration unit (3).
8. A flat sheet membrane element according to any of claims 3 to 6, wherein: the left and right intervals of the pleats (12) of the membrane filtration units (3) are the same, and the pleats (12) of the adjacent membrane filtration units (3) are aligned.
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| CN201910966972.9A CN110652880B (en) | 2019-10-12 | 2019-10-12 | Membrane filtration unit and flat membrane element |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910966972.9A CN110652880B (en) | 2019-10-12 | 2019-10-12 | Membrane filtration unit and flat membrane element |
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| CN110652880A CN110652880A (en) | 2020-01-07 |
| CN110652880B true CN110652880B (en) | 2021-12-21 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5460720A (en) * | 1993-08-12 | 1995-10-24 | Schneider; Burnett M. | Pleated membrane crossflow fluid separation device |
| JP2005058829A (en) * | 2003-08-18 | 2005-03-10 | Stem:Kk | Filtration separation membrane cartridge, filtration separation membrane unit, and filtration device |
| CN1623636A (en) * | 2004-10-26 | 2005-06-08 | 贡有成 | Folded tubular membrane and filter formed by same |
| JP2008068162A (en) * | 2006-09-12 | 2008-03-27 | Kurita Water Ind Ltd | Filter for water treatment and filter module |
| CN107497304A (en) * | 2017-09-30 | 2017-12-22 | 盐城海普润膜科技有限公司 | Combined filtration membrane material and its preparation method and application |
| CN108043229A (en) * | 2018-01-26 | 2018-05-18 | 嘉兴里仁环保科技有限公司 | A kind of tablet membrane filtration module |
| CN108554184A (en) * | 2018-05-16 | 2018-09-21 | 浙江开创环保科技股份有限公司 | A kind of high density flat membrane component |
| WO2018219737A1 (en) * | 2017-05-31 | 2018-12-06 | Mann+Hummel Gmbh | Ceramic filter element, and filter module |
-
2019
- 2019-10-12 CN CN201910966972.9A patent/CN110652880B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5460720A (en) * | 1993-08-12 | 1995-10-24 | Schneider; Burnett M. | Pleated membrane crossflow fluid separation device |
| JP2005058829A (en) * | 2003-08-18 | 2005-03-10 | Stem:Kk | Filtration separation membrane cartridge, filtration separation membrane unit, and filtration device |
| CN1623636A (en) * | 2004-10-26 | 2005-06-08 | 贡有成 | Folded tubular membrane and filter formed by same |
| JP2008068162A (en) * | 2006-09-12 | 2008-03-27 | Kurita Water Ind Ltd | Filter for water treatment and filter module |
| WO2018219737A1 (en) * | 2017-05-31 | 2018-12-06 | Mann+Hummel Gmbh | Ceramic filter element, and filter module |
| CN107497304A (en) * | 2017-09-30 | 2017-12-22 | 盐城海普润膜科技有限公司 | Combined filtration membrane material and its preparation method and application |
| CN108043229A (en) * | 2018-01-26 | 2018-05-18 | 嘉兴里仁环保科技有限公司 | A kind of tablet membrane filtration module |
| CN108554184A (en) * | 2018-05-16 | 2018-09-21 | 浙江开创环保科技股份有限公司 | A kind of high density flat membrane component |
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