CN211886277U - Compound filter element group spare and water purification system - Google Patents

Compound filter element group spare and water purification system Download PDF

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Publication number
CN211886277U
CN211886277U CN202020186721.7U CN202020186721U CN211886277U CN 211886277 U CN211886277 U CN 211886277U CN 202020186721 U CN202020186721 U CN 202020186721U CN 211886277 U CN211886277 U CN 211886277U
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China
Prior art keywords
filter element
central tube
wall surface
stage pretreatment
filter
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CN202020186721.7U
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Chinese (zh)
Inventor
潘丹
程广顺
郭琨
徐海晶
张常亮
郑娅敏
高威
李友铃
申鸿海
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
    • B01D69/10—Supported membranes; Membrane supports
    • 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
    • B01D63/10—Spiral-wound membrane modules
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2311/00—Details relating to membrane separation process operations and control
    • B01D2311/26—Further operations combined with membrane separation processes
    • B01D2311/2649—Filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/08—Flow guidance means within the module or the apparatus
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/002—Construction details of the apparatus

Abstract

The utility model provides a compound filter element group spare and water purification system, compound filter element group spare includes: the filter element comprises a pretreatment filter element (1), a fine treatment filter element (2) and a central tube (3), wherein the fine treatment filter element (2) is a roll-type membrane and is wound on the central tube (3), the central tube (3) is made of a material capable of allowing a fluid channel, the inner wall surface of the central tube (3) is a first concave curved surface, and/or the pretreatment filter element (1) also comprises an inner wall surface formed into a second concave curved surface. Through the utility model discloses can guarantee the filter effect or improve the filter effect when, can also do little with compound filter element group spare holistic volume, under the same volume, the filter area of increase filter core has improved filtration efficiency, realizes the filter effect simultaneously and reduces the effect of filter core volume.

Description

Compound filter element group spare and water purification system
Technical Field
The utility model belongs to the technical field of the water purification, concretely relates to compound filter element group spare and water purification system.
Background
At present, market water purifier has become more and more common, and people's requirement to the water purifier is higher and higher, and the filter core that the water purifier used is also various, develops to multistage filter core from single-stage filter core, and wherein the multistage filter core that antibiotic PP cotton filter core, active carbon filter core and ultrafiltration membrane filter core are constituteed is when realizing hierarchical filtration, and overall design is more complicated like this, but adds multistage filtration in order to guarantee the filter effect and lead to having the problem that the volume is great, filtration efficiency hangs down.
Because multistage filter element group spare among the prior art has technical problem such as the volume is great, filtration efficiency hangs down, consequently the utility model discloses study and design a compound filter element group spare and water purification system.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the utility model lies in overcoming the defect that can also reduce the volume when compound filter element group spare among the prior art can't guarantee filtration efficiency to a compound filter element group spare and water purification system are provided.
The utility model provides a compound filter element group spare, it includes:
the fine treatment filter element is a spiral membrane and is wound on the central tube, the central tube is made of a material capable of allowing a fluid channel, and the inner wall surface of the central tube is formed into a first concave curved surface and/or the pre-treatment filter element also comprises an inner wall surface formed into a second concave curved surface.
Preferably, the first and second electrodes are formed of a metal,
the filter material that can allow the fluid to pass through includes: at least one of a carbon material, a polypropylene pp material and a ceramic material; and/or the fine treatment filter element is a reverse osmosis membrane.
Preferably, the first and second electrodes are formed of a metal,
the central tube is of a cylindrical carbon rod structure consisting of the carbon material; or the central pipe is of a cylindrical PP structure made of the polypropylene PP material; or the central tube is of a cylindrical ceramic tube structure made of the ceramic material.
Preferably, the first and second electrodes are formed of a metal,
the pretreatment filter element comprises a first-stage pretreatment filter element and a second-stage pretreatment filter element, the first-stage pretreatment filter element is arranged on the radial periphery of the second-stage pretreatment filter element, and the inner wall surface of the second-stage pretreatment filter element is formed into a second concave curved surface.
Preferably, the first and second electrodes are formed of a metal,
the inner wall surface of the central tube is also provided with a first groove; and/or a second groove is further arranged on the inner wall surface of the second-stage pretreatment filter element.
Preferably, the first and second electrodes are formed of a metal,
when the first grooves are included, the first grooves are multiple and are uniformly distributed along the inner wall surface of the central tube; when the second grooves are included, the second grooves are multiple and are uniformly distributed along the inner wall surface of the second-stage pretreatment filter element.
Preferably, the first and second electrodes are formed of a metal,
the inner periphery of the central pipe is also provided with a first supporting framework, and the shape of the first supporting framework is matched with the shape of the inner wall surface of the central pipe and is also of an inwards concave curved surface structure; and/or a second supporting framework is further arranged on the inner periphery of the second-stage pretreatment filter element, and the shape of the second supporting framework is matched with the shape of the inner wall surface of the second-stage pretreatment filter element and is also of an inwards concave curved surface structure.
Preferably, the first and second electrodes are formed of a metal,
the first-stage pretreatment filter element is made of PP cotton, and the second-stage pretreatment filter element is made of activated carbon; and/or, the first-stage pretreatment filter element is of a cylindrical structure, the second-stage pretreatment filter element is of a cylindrical structure, and the inner wall surface of the second-stage pretreatment filter element is an inwards concave curved surface.
Preferably, the first and second electrodes are formed of a metal,
still include ultrafiltration filter core, set up in the radial inner periphery of center tube, ultrafiltration filter core is at least one.
The utility model also provides a water purification system, it includes preceding arbitrary compound filter element group spare.
The utility model provides a pair of compound filter element group spare and water purification system has following beneficial effect:
the utility model discloses a make the internal face of center tube into first indent curved surface, can effectively increase the area that the inside fluid of center tube contacted with it, the area that the outside fluid of center tube contacted with it has also effectively been increased, thereby effectively strengthen the filter effect, set up the preliminary treatment filter core also to the internal face including second indent curved surface, also can effectively increase the area that the inside fluid of preliminary treatment filter core contacted with it, the area that the outside fluid of preliminary treatment filter core contacted with it has also effectively been increased, thereby effectively strengthen the filter effect, therefore can guarantee the filter effect or improve the filter effect, can also make the holistic volume of compound filter element group spare small, under the same volume, increase the filtration area of filter core, improve the filtration efficiency, realize the filter effect simultaneously and reduce the effect of filter element volume; and through set up the structure of first recess, second recess on first concave curved surface and/or second concave curved surface, can further increase the area of contact between this wall and the fluid, further improve the filter effect, further under the same volume, increase the filter area of filter core, improved filtration efficiency, or reduced the volume of filter core on the same or the basis that improves of filter effect.
Drawings
Fig. 1 is a schematic view of the internal cross-sectional structure of the composite filter element assembly of the present invention.
The reference numbers in the figures denote:
1. pretreating a filter element; 11. a first stage pretreatment filter element; 12. a second stage pre-treatment filter element; 13. a second groove; 2. finely processing the filter element; 3. a central tube; 31. a first groove; 4. an ultrafiltration filter element; 5. a bottle body; 6. and (7) covering.
Detailed Description
As shown in fig. 1, the present invention provides a composite filter element assembly, comprising:
the pretreatment filter element 1 and the fine treatment filter element 2 further comprise a central tube 3, the fine treatment filter element 2 is a spiral membrane and is wound on the central tube 3, the central tube 3 is made of a material capable of allowing a fluid channel, the inner wall surface of the central tube 3 is a first concave curved surface, and/or the pretreatment filter element 1 also comprises an inner wall surface formed into a second concave curved surface.
The utility model discloses a make first indent curved surface with the internal face of center tube, can effectively increase the area of the inside fluid of center tube rather than the contact, the area of the outside fluid of center tube rather than the contact has also effectively been increased, thereby effectively strengthen the filter effect, also set up the preliminary treatment filter core into the internal face including second indent curved surface, also can effectively increase the inside fluid of preliminary treatment filter core rather than the area of contact, the outside fluid of preliminary treatment filter core rather than the area of contact has also effectively been increased, thereby effectively strengthen the filter effect, consequently, can guarantee the filter effect or improve the filter effect when, can also make compound filter element group spare holistic volume little, under the same volume, increase the filter area of filter core, the filtration efficiency is improved, realize the filter effect simultaneously and reduce the effect of filter element volume. The central tube is arranged to be a structure (preferably a carbon rod) allowing fluid to pass through, the reverse osmosis membrane is rolled on the central tube, and compared with the existing structure in which the central tube is arranged outside the carbon rod to wind the RO membrane, the structure of the central tube is effectively omitted, the volume of the rolled reverse osmosis composite filter element is reduced, and the space of the composite filter element is reduced.
Preferably, the first and second electrodes are formed of a metal,
the filter material that can allow the fluid to pass through includes: at least one of a carbon material, a polypropylene pp material and a ceramic material; and/or the fine treatment filter element 2 is a reverse osmosis membrane. This is the utility model discloses an effective passing through of allowable water can be realized to the preferred material of filter media material, can also carry out the filter action to the water through it in addition, can also form the filter effect of one-level when realizing the support function with the center tube, has overcome because the defect of the volume increase that the filter core progression increases and bring, reduces the volume, saves the cost.
Preferably, the first and second electrodes are formed of a metal,
the central tube 3 is a cylindrical carbon rod structure consisting of the carbon material; or the central pipe 3 is a cylindrical PP structure made of the polypropylene PP material; or, the central tube 3 is a cylindrical ceramic tube structure made of the ceramic material. The utility model discloses can allow the filter media that fluid passed through can include: carbon rods, cylindrical polypropylene pp material filter materials, ceramic tubes and the like are preferably used for improving the taste of carbon as the material of the central tube of the roll-type membrane element, so that the plastic central tube used by the existing roll-type membrane can be abandoned, the use of the plastic central tube of the existing roll-type membrane element is avoided, and one membrane element can have two-stage filtering functions; the carbonaceous central tube is utilized, so that the subsequent reuse of the taste filter element can be avoided, and the membrane element integrates two-stage filtering functions of a fine filtering filter element and a rear taste filter element; the carbonaceous central tube does not have macroscopic macropore, and its surface is covered with structural micropore, compares in the visual macroporous central tube of traditional working of plastics, and roll-type diaphragm produced water is collected more easily. The PP cylindrical central tube can effectively remove various particle impurities in the filtered liquid, has a multilayer depth structure, large pollutant carrying capacity, large filtering flow, small pressure difference, no chemical adhesive, higher sanitation, higher safety, acid resistance, alkali resistance, organic solution and oil resistance, good chemical stability and integration of surface, deep layer and coarse and fine filtering; has the characteristics of large flow, corrosion resistance, high pressure resistance, low cost and the like. Used for blocking large granular substances such as rust, silt, worm eggs and the like in water. The ceramic tube-shape center tube can filter, antibiotic and activation treatment drinking water, harmful removal chlorine residue and suspended pollutant, organic chemical substance, colour and peculiar smell, can filter out the drinking water that reaches certain drinking standard through using this filter core.
Preferably, the first and second electrodes are formed of a metal,
the pretreatment filter element 1 comprises a first-stage pretreatment filter element 11 and a second-stage pretreatment filter element 12, wherein the first-stage pretreatment filter element 11 is arranged at the radial periphery of the second-stage pretreatment filter element 12, and the inner wall surface of the second-stage pretreatment filter element 12 is formed into a second concave curved surface. This is the utility model discloses a formation concrete position of the second indent curved surface of preliminary treatment filter core, namely type in the radial interior week (on the internal face) of second grade preliminary treatment filter core, can effectively make through the interior week fluid of second grade preliminary treatment filter core and the area of contact between the second grade preliminary treatment filter core can effectual increase, improve the filter effect, can also reduce composite filter core overall volume (compare with current composite filter core, can reduce the volume when the filter effect is the same, can improve the filter effect when the volume is the same).
Preferably, the first and second electrodes are formed of a metal,
a first groove 31 is also arranged on the inner wall surface of the central tube 3; and/or a second groove 13 is further arranged on the inner wall surface of the second-stage pretreatment filter element 12. Through set up the structure of first recess, second recess on first indent curved surface and/or second indent curved surface, can further increase the area of contact between this wall and the fluid, further improve the filter effect, further under the same volume, the filter area of increase filter core has improved filtration efficiency, or has reduced the volume of filter core on the basis that the filter effect is the same or improves.
Preferably, the first and second electrodes are formed of a metal,
when the first grooves 31 are included, the first grooves 31 are plural and are uniformly distributed along the inner wall surface of the central tube 3; when the second grooves 13 are included, the second grooves 13 are multiple and are uniformly distributed along the inner wall surface of the second-stage pretreatment filter element 12. This is the utility model discloses a further preferred structural style of first recess and second recess can further effectively increase the area of contact between filter core and the fluid, improves the filter effect, perhaps reduces the whole volume of filter core when the filter effect is the same.
Preferably, the first and second electrodes are formed of a metal,
the inner periphery of the central tube 3 is also provided with a first supporting framework (not shown), and the shape of the first supporting framework is matched with the shape of the inner wall surface of the central tube 3 and is also of a concave curved surface structure; and/or a second supporting framework (not shown) is further arranged on the inner periphery of the second-stage pretreatment filter element 12, and the shape of the second supporting framework is matched with the shape of the inner wall surface of the second-stage pretreatment filter element 12 and is also of an inwards concave curved surface structure. Can play the effect of effective support to the carbon-point center tube through first support skeleton, can also play the effect of effective support to second level preliminary treatment filter core through second support skeleton, improve the structural strength of carbon-point, and also can strengthen the bonding area for the concave curved surface that the shape matches, improve bonding strength.
Preferably, the first and second electrodes are formed of a metal,
the first-stage pretreatment filter element 11 is made of PP cotton, and the second-stage pretreatment filter element 12 is made of activated carbon; and/or, the first-stage pretreatment filter element 11 is of a cylindrical structure, the second-stage pretreatment filter element 12 is of a cylindrical structure, and the inner wall surface of the second-stage pretreatment filter element is an inwards concave curved surface. This is the utility model discloses a material respectively of two-stage preliminary treatment filter core to and preferred structural style, can cross large granule impurity such as silt through the PP cotton, the active carbon can adsorb chlorine residue etc. and cylindric structure can conveniently carry out inside and outside intussusception.
Preferably, the first and second electrodes are formed of a metal,
the device also comprises an ultrafiltration filter element 4 and at least one ultrafiltration filter element 4, wherein the ultrafiltration filter element 4 is arranged on the radial inner periphery of the central tube 3. This is the utility model discloses a preferred structural style of rearmounted filter core can carry out the filtration of effectively disinfecting, preferably a rearmounted filter core to water through the ultrafiltration filter core.
The utility model also provides a water purification system, it includes preceding arbitrary compound filter element group spare.
The utility model discloses lie in carrying out the whole indent curved surface with cylindrical filter element body, open a plurality of recesses at the filter element body simultaneously, under the same volume, increase the filtration area of filter element, improved filtration efficiency; the volume of the system is reduced under the filtering effect, and the problems of large occupied space of the filter element and low filtering efficiency are effectively solved.
The utility model discloses a composite filter element, which comprises an upper cover and a bottle body (see attached figure 1). The interior of the bottle body relates to multi-stage filtration, including a pretreatment filter element, a fine filtration and a post-treatment filter element. The pretreatment consists of PP cotton and granular activated carbon; the fine treatment is composed of a reverse osmosis membrane; the post-treatment consists of a carbon rod and an ultrafiltration membrane. The water gap consists of a raw water gap, a pure water gap and a waste water gap. The first stage of filtration is arranged on the upper half part of the filter element and comprises PP cotton and active carbon; the second filter is arranged on the lower half part of the filter element and comprises a reverse osmosis membrane, a carbon rod central tube and an ultrafiltration membrane; the filter element comprises PP cotton, activated carbon, a reverse osmosis membrane, a carbon rod central tube and an ultrafiltration membrane, the carbon rod central tube is recessed, the contact area with water is increased under the same filtering area, the size of the filter element is smaller, and the filtering effect is improved; simultaneously, for better increase filter area, design a plurality of recesses on the center tube body, the recess can be opened into a plurality of bar grooves, also can open into a plurality of circular recess simultaneously.
And (3) analyzing a water purification waterway system: the whole water purification waterway system is as shown in fig. 1, tap water enters from a raw water port, water flows stay at the upper half part of a filter element from two sides, water is collected at an upper central tube after being filtered after sequentially passing through a PP cotton and granular activated carbon filter element, flows into two sides of the lower half part of the filter element, sequentially passes through a reverse osmosis membrane and a carbon rod central tube, water is collected in the carbon rod central tube after being filtered, and is filtered by an ultrafiltration membrane, finally, the whole raw water is filtered, and pure water flows out from a middle pure water port. The waste water goes out water is that rivers wash reverse osmosis membrane through the both sides of filter core the latter half to the realization is washed, and waste water flows from the waste water mouth.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (10)

1. A composite filter element assembly, comprising: the method comprises the following steps:
the filter element comprises a pretreatment filter element (1), a fine treatment filter element (2) and a central tube (3), wherein the fine treatment filter element (2) is a roll-type membrane and is wound on the central tube (3), the central tube (3) is made of a material capable of allowing a fluid channel, the inner wall surface of the central tube (3) is a first concave curved surface, and/or the pretreatment filter element (1) also comprises an inner wall surface formed into a second concave curved surface.
2. The composite filter element assembly of claim 1, wherein:
the filter material that can allow the fluid to pass through includes: at least one of a carbon material, a polypropylene pp material and a ceramic material; and/or the fine treatment filter element (2) is a reverse osmosis membrane.
3. The composite filter element assembly of claim 2, wherein:
the central tube (3) is of a cylindrical carbon rod structure consisting of the carbon material; or the central pipe (3) is of a cylindrical PP structure made of the polypropylene PP material; or the central tube (3) is a cylindrical ceramic tube structure made of the ceramic material.
4. The composite filter element assembly according to any one of claims 1-3, wherein:
the pretreatment filter element (1) comprises a first-stage pretreatment filter element (11) and a second-stage pretreatment filter element (12), wherein the first-stage pretreatment filter element (11) is arranged at the radial periphery of the second-stage pretreatment filter element (12), and the inner wall surface of the second-stage pretreatment filter element (12) is formed into a second concave curved surface.
5. The composite filter element assembly of claim 4, wherein:
a first groove (31) is further formed in the inner wall surface of the central tube (3); and/or a second groove (13) is further arranged on the inner wall surface of the second-stage pretreatment filter element (12).
6. The composite filter element assembly of claim 5, wherein:
when the first grooves (31) are included, the first grooves (31) are multiple and are uniformly distributed along the inner wall surface of the central tube (3); when the second-stage pretreatment filter element comprises a plurality of second grooves (13), the second grooves (13) are uniformly distributed along the inner wall surface of the second-stage pretreatment filter element (12).
7. The composite filter element assembly of claim 4, wherein:
the inner periphery of the central pipe (3) is also provided with a first supporting framework, and the shape of the first supporting framework is matched with the shape of the inner wall surface of the central pipe (3) and is also of an inwards concave curved surface structure; and/or a second supporting framework is further arranged on the inner periphery of the second-stage pretreatment filter element (12), and the shape of the second supporting framework is matched with the shape of the inner wall surface of the second-stage pretreatment filter element (12) and is also of an inwards concave curved surface structure.
8. The composite filter element assembly of claim 4, wherein:
the first-stage pretreatment filter element (11) is made of PP cotton, and the second-stage pretreatment filter element (12) is made of activated carbon; and/or, the first-stage pretreatment filter element (11) is of a cylindrical structure, and the second-stage pretreatment filter element (12) is of a cylindrical structure, and the inner wall surface of the second-stage pretreatment filter element is an inwards concave curved surface.
9. The composite filter element assembly according to any one of claims 1-3, wherein:
still include ultrafiltration filter core (4), set up in the radial inner periphery of center tube (3), ultrafiltration filter core (4) are at least one.
10. A water purification system, its characterized in that: comprising the composite filter element assembly of any of claims 1-9.
CN202020186721.7U 2019-08-02 2020-02-19 Compound filter element group spare and water purification system Active CN211886277U (en)

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Application Number Priority Date Filing Date Title
CN2019107134546 2019-08-02
CN201910713454 2019-08-02

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CN211886277U true CN211886277U (en) 2020-11-10

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CN202010103189.2A Pending CN111185097A (en) 2019-08-02 2020-02-19 Roll up formula membrane module, compound filter element group spare and water purification system
CN202020186721.7U Active CN211886277U (en) 2019-08-02 2020-02-19 Compound filter element group spare and water purification system
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CN202010103184.XA Pending CN111185096A (en) 2019-08-02 2020-02-19 Compound filter element group spare and water purification system
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CN202010105864.5A Pending CN111185102A (en) 2019-08-02 2020-02-19 Spiral wound membrane module and water purification system

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CN202010103366.7A Pending CN111185100A (en) 2019-08-02 2020-02-19 Central tube for roll type membrane, roll type membrane component and water purification system
CN202020191911.8U Active CN211886284U (en) 2019-08-02 2020-02-19 Purifier filter core center tube, spiral wound membrane module and compound filter core subassembly
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CN202010103364.8A Pending CN111185099A (en) 2019-08-02 2020-02-19 Compound filter element group spare and water purification system
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CN202010105797.7A Pending CN111318175A (en) 2019-08-02 2020-02-19 Spiral wound membrane module and water purification system
CN202020187695.XU Active CN211886283U (en) 2019-08-02 2020-02-19 Central tube for roll type membrane, roll type membrane component and water purification system
CN202020186748.6U Active CN212091725U (en) 2019-08-02 2020-02-19 Compound filter element group spare and water purification system
CN202010105792.4A Pending CN111185101A (en) 2019-08-02 2020-02-19 Water purification unit with filter element group spare
CN202010103151.5A Pending CN111229054A (en) 2019-08-02 2020-02-19 Compound filter element group spare and water purification system
CN202020187694.5U Active CN211886282U (en) 2019-08-02 2020-02-19 Spiral wound membrane module and water purification system
CN202010103362.9A Pending CN111185098A (en) 2019-08-02 2020-02-19 Purifier filter core center tube, spiral wound membrane module and compound filter core subassembly
CN202010103184.XA Pending CN111185096A (en) 2019-08-02 2020-02-19 Compound filter element group spare and water purification system
CN202010103369.0A Pending CN111229057A (en) 2019-08-02 2020-02-19 Compound filter element group spare and water purification system
CN202010105864.5A Pending CN111185102A (en) 2019-08-02 2020-02-19 Spiral wound membrane module and water purification system

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