WO2022005063A1 - Membrane pour diffuseur d'air comprenant deux types de caoutchouc - Google Patents

Membrane pour diffuseur d'air comprenant deux types de caoutchouc Download PDF

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Publication number
WO2022005063A1
WO2022005063A1 PCT/KR2021/007640 KR2021007640W WO2022005063A1 WO 2022005063 A1 WO2022005063 A1 WO 2022005063A1 KR 2021007640 W KR2021007640 W KR 2021007640W WO 2022005063 A1 WO2022005063 A1 WO 2022005063A1
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WO
WIPO (PCT)
Prior art keywords
membrane
air
rubber layer
hardness
diffuser
Prior art date
Application number
PCT/KR2021/007640
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English (en)
Korean (ko)
Inventor
최원용
추지화
Original Assignee
(주)효광테크
미래그린텍 주식회사
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Publication of WO2022005063A1 publication Critical patent/WO2022005063A1/fr

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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
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/20—Activated sludge processes using diffusers
    • C02F3/201—Perforated, resilient plastic diffusers, e.g. membranes, sheets, foils, tubes, hoses
    • 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
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/20—Activated sludge processes using diffusers
    • C02F3/208—Membrane aeration
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • the present invention relates to a membrane for an air diffuser comprising two types of rubber, and more particularly, an acid capable of improving durability and generating microbubbles by manufacturing a multi-layer or single-layer membrane using two types of rubber layers having different shore hardnesses. It relates to tracheal membranes. In addition, it relates to a membrane for a diffuser pipe having improved antifouling properties by forming a diamond-shaped pattern on the surface of the membrane.
  • the air diffuser is a device to purify water by spraying air, oxygen, and ozone into the water, and the sprayed gas is dissolved in water to provide an environment for oxidation of organic matter, nitrification and growth of microorganisms.
  • the membrane-type diffuser has a structure in which perforated micropores are opened while the elastic membrane is expanded by compressed air and oxygen is injected, and the air introduced from the blower is finely jetted through the membrane. Since the performance of the diffuser is determined by the oxygen transfer efficiency, it is most important to maximize the oxygen transfer efficiency.
  • the membrane diffuser generally uses a disk type diffuser, a tube type diffuser, or a plate type membrane diffuser, and a plurality of pores are punched into a membrane made of synthetic rubber or similar thin film.
  • FIG. 1 shows the structure of a typical prior art membrane diffuser.
  • a membrane 110 made of a flexible synthetic rubber is laminated and assembled on a diffuser base 120 and then the membrane 110 and the base 120 are fixed by using a fixing nut 160 to fix it.
  • a screw thread 150 is formed on the side portion of the base 120 for fastening with the fixing nut 160 .
  • a plurality of micropores (slits) for air permeation are perforated in the membrane 110 .
  • an air orifice 140 for supplying air to the air diffuser is provided at the center of the rear portion of the base 120, and the outer lower end of the air orifice 140 is for a pipe so that the air diffuser can be assembled and installed in the air supply pipe.
  • a screw 130 is formed.
  • the flexible membrane 110 expands by the pressure of the air, and the slit formed in the membrane is opened. At this time, air may be introduced into the aeration tank through the opened slit.
  • the membrane 110 is seated on the diffuser base 120, the expanded slit is closed, and at the same time the slit is not punched in a certain area in the center of the membrane 110 It is seated on the air orifice 140 and is manufactured to block the treated water from flowing back into the air supply pipe.
  • Air supplied from the air blower ejects air bubbles having a diameter of less than 5 mm into the treated water through a plurality of slits formed in the membrane 110 .
  • the flow of the treated water is formed on the surface of the aeration tank by air bubbles ejected from the treated water, thereby preventing solids from accumulating on the bottom of the aeration tank.
  • EPDM ethylene propylene monomer
  • silicone silicone
  • NBR acrylonitrile-butadiene rubber
  • FKM fluoroelastomer
  • the surface of the membrane is coated with PTFE (Polytetrafluoroethylene) or treated with fluorine to reduce the adhesion of foreign substances in the water, and the physical properties of the membrane can be maintained for a long time.
  • PTFE Polytetrafluoroethylene
  • the present invention provides a first rubber layer having a Shore A hardness of 50 to 70; and a second rubber layer laminated on the first rubber layer and having a Shore A hardness of 60 to 75.
  • the first rubber layer and the second rubber layer are each independently selected from the group consisting of EPDM (Ethylene Propylene Monomer), silicone, NBR (acrylonitrile-butadiene rubber) and FKM (Fluoroelastomer). can be configured.
  • EPDM Ethylene Propylene Monomer
  • silicone silicone
  • NBR acrylonitrile-butadiene rubber
  • FKM Fluoroelastomer
  • the ratio of the thickness of the first rubber layer and the second rubber layer is preferably 1:1 to 3:1.
  • the membrane for a diffuser of the present invention may be characterized in the form of a tube.
  • a plurality of intaglio or embossed patterns may be formed on the surface of the uppermost layer of the membrane.
  • the present invention also provides a second rubber layer having a Shore A hardness of 60 to 75; and a first rubber layer formed on the outside of the second rubber layer and having a Shore A hardness of 50 to 70.
  • the diameter of the second rubber layer is preferably 1/4 to 1/2 of the diameter of the entire membrane.
  • Oxygen transfer efficiency ( Oxygen Transfer Efficiency) is excellent, and the durability of the slit is improved to prevent easy tearing of parts subjected to large air pressure, thereby delaying product replacement time.
  • FIG. 1 shows the structure of a typical prior art membrane diffuser.
  • FIG. 2 is a cross-sectional view of a membrane for a diffuser according to an embodiment of the present invention.
  • FIG 3 is a cross-sectional view of a membrane for a diffuser including a PTFE layer according to an embodiment of the present invention.
  • FIG. 4 is a cross-sectional view of a membrane for a diffuser according to another embodiment of the present invention.
  • FIG. 5 shows a cross-sectional view of a membrane for a diffuser including a PTFE layer according to another embodiment of the present invention.
  • FIG. 6 shows a membrane for a diffuser having a diamond-shaped pattern formed on its surface, according to an exemplary embodiment of the present invention.
  • FIG. 7 is a photograph comparing the generation of bubbles according to air supply by putting the diffuser according to an embodiment of the present invention into a water tank.
  • (a) is a diffusion pipe using a conventional single-layer membrane
  • (b) is a diffusion pipe in which a diamond pattern is formed on the surface of the single-layer membrane
  • (c) is a first layer of Shore A hardness of 60 and Shore A hardness
  • the diffuser of the present invention in which the second layer of 70 is composed of multiple layers
  • (d) shows the diffuser of the present invention in which the first layer of Shore A hardness of 60 and the second layer of Shore A hardness of 70 are constituted as inner and outer layers.
  • the present invention relates to a membrane for an aeration pipe installed in an aeration tank of a wastewater treatment plant to efficiently dissolve oxygen in the air into wastewater by dispersing it in treated water by forming ultra-fine bubbles of air supplied from a blower.
  • the membrane for a diffuser according to the present invention is made of rubber having different shore A hardness in multiple layers, but by laminating a rubber having a higher shore A hardness as an upper layer, through a slit As the size of the ejected bubble was reduced, the oxygen transfer efficiency was increased and the durability was greatly improved.
  • the membrane for a diffuser of the present invention includes a first rubber layer 10 having a Shore A hardness of 50 to 70 and a second rubber layer laminated on the first rubber layer 10 and having a Shore A hardness of 60 to 75 ( 20) is included.
  • the first rubber layer 10 and the second rubber layer 20 may use a synthetic rubber generally used for a membrane for an air diffuser, for example, EPDM (Ethylene Propylene Monomer), silicone, NBR (acrylonitrile-butadiene rubber) , FKM (Fluoroelastomer), etc. can be used.
  • EPDM Ethylene Propylene Monomer
  • silicone silicone
  • NBR acrylonitrile-butadiene rubber
  • FKM Fluoroelastomer
  • the first rubber layer 10 and the second rubber layer 20 are preferably made of the same rubber material. Since the first and second rubber layers 10 and 20 are made of the same material, the two rubber layers can be firmly fixed by pressing without forming an adhesive layer or a primer layer between the rubber layers.
  • EPDM may be used as a material for the first rubber layer 10 and the second rubber layer 20 .
  • the first rubber layer 10 preferably has a Shore A hardness of 50 to 70, more preferably a Shore A hardness of 55 to 65, and most preferably a Shore A hardness of 58 to 62.
  • the first rubber layer 10 may use a rubber having the hardness generally used for the membrane for the diffuser.
  • the thickness of the first rubber layer 10 is preferably 1 to 2 mm, more preferably 1.3 to 1.7 mm.
  • the second rubber layer 20 preferably has a Shore A hardness of 60 to 75, more preferably a Shore A hardness of 65 to 75, and most preferably a Shore A hardness of 68 to 72.
  • Shore A hardness of the second rubber layer 20 By controlling the Shore A hardness of the second rubber layer 20 in this way, it is possible to withstand a greater tensile force acting on the outside than on the inside of the membrane, so that the degree of slit widening is similar to that of the first rubber layer 10 and is stably 1 mm or less. of air bubbles can be ejected, and the durability is long lasting.
  • the thickness of the second rubber layer 20 is preferably 0.7 to 1.3 mm, more preferably 0.9 to 1.1 mm.
  • the thickness ratio of the first rubber layer 10 and the second rubber layer 20 is 1:1 to 3:1, and a thickness ratio of 1.3:1 to 1.7:1 is preferable.
  • the surface of the second rubber layer 20 may be coated with PTFE or treated with fluorine. As described above, through the surface treatment of the membrane, the adhesion of foreign substances in the water is reduced, and the physical properties of the membrane can be maintained for a long time by acting as a protective film for the membrane made of synthetic rubber against water.
  • the PTFE coating layer 30 may be coated with a PTFE layer by a known technique after forming a primer layer 40 on the second rubber layer 20 according to a known technique.
  • the perforation is preferably configured in a slit shape, so that the slit opens when the membrane is expanded by air pressure and closes when no air is injected.
  • the slit When the slit is simply formed to be small in order to evenly eject air bubbles having an average diameter of 1 mm or less in the membrane for a diffuser of the prior art, the air pressure increases and the membrane over-expands, shortening the service life, and the outer slit is partially opened. As a result, there was a problem that the air bubbles could not be ejected uniformly.
  • the multilayer membrane of the present invention has different hardnesses of the first layer and the second layer, so that when the membrane is expanded by air injection, it expands well enough in the direction in which air is introduced to ensure that the slit of 1 mm is well opened
  • the wastewater-side rubber attenuates the elongation to suppress excessive expansion of the membrane, thereby increasing the durability of the membrane while maintaining the size of air bubbles ejected through the slit within 1 mm. Therefore, compared to a membrane having a general structure, the replacement time can be delayed by increasing the durability of the membrane while increasing the oxygen transfer efficiency for dissolving oxygen in the air in the wastewater.
  • the membrane for the diffuser may be manufactured in the form of a tube.
  • the inner side of the tube may be formed as the first rubber layer, and the outer side may be formed as the second rubber layer.
  • the membrane for a diffuser of the present invention may be configured to include a first rubber layer 10 on the outside and a second rubber layer 20 on the inside.
  • the "outer” and “inner” are mainly circular membranes (disk-shaped or plate-shaped).
  • a small circle including the center is referred to as an inner side, and the remaining donut-shaped portion formed outside the inner small circle is expressed as an outer side.
  • the inner side of the membrane is composed of a second rubber layer 20 having a Shore A hardness of 60 to 75, and the outer side of the membrane is composed of a first rubber layer 10 having a Shore A hardness of 50 to 70.
  • the air pressure introduced from the blower catches the expansion at the inner center, and the air moves to the outer side, generating fine bubbles in the entire disc part even with a small input pressure. This can greatly increase the oxygen transfer efficiency.
  • the diameter of the inner second rubber layer 20 is preferably 1/4 to 1/2 of the diameter of the entire membrane.
  • first rubber layer 10 and the second rubber layer 20 are made of the same material, it is possible to firmly bond them by pressing without forming an adhesive layer or a primer layer.
  • the thickness of the first and second rubber layers is preferably 2.1 to 2.5 mm.
  • a primer layer 40 on the surface of the membrane for a diffuser of the present invention including the first and second rubber layers on the inside and outside, and then coat the PTFE coating layer 30 . .
  • a diamond-shaped pattern may be formed on the surface of the uppermost layer of the membrane for the diffuser.
  • the pattern is preferably, as shown in FIG. 6 , inverted-polygonal cone-shaped engraved patterns such as diamonds may be formed on the surface of the membrane to a depth of 0.05 to 0.2 mm.
  • the pattern may form an intaglio or embossed pattern by eroding the surface of the rubber membrane in the shape of a predetermined pattern.
  • the pattern may form an intaglio or embossed pattern by forming an additional coating layer such as a nonwoven fabric on the uppermost layer of the membrane and etching the additional coating layer.
  • an additional coating layer such as a nonwoven fabric
  • the cell size was measured using a multilayer membrane in which a first rubber layer having a shore hardness of 60 and a second rubber layer having a shore hardness of 70 were laminated and a multilayer membrane in which a second rubber layer having a shore hardness of 80 was laminated, respectively, and described in the table below. .
  • the bubble size is very small, 0.5 to 1.2 mm, and uniform bubbles are generated without clogging the slit.
  • the slit can be sufficiently expanded in the first layer, and the membrane is well contained in the second layer from excessive swelling. Therefore, it can be expected that the membrane of Example 1 has significantly superior durability compared to the membrane of Comparative Example 1, which is greatly inflated to generate 1 to 2 mm of air bubbles.
  • FIG. 7 a comparison result is shown in FIG. 7 by introducing an air diffuser into the water tank to generate air.
  • FIG. 7 (a) is a diffusion pipe using a conventional single-layer membrane, (b) is a diffusion pipe in which a diamond pattern is formed on the surface of the single-layer membrane, (c) is a first layer of Shore A hardness of 60 and Shore A hardness of 70
  • the diffuser pipe of the present invention composed of a second layer of multilayer, and (d) shows the diffuser pipe of the present invention composed of a first layer having a shore A hardness of 60 and a second layer having a shore A hardness of 70 as inner and outer layers.
  • the bubble size was irregular and most exhibited a size of 1 mm or more.
  • the bubble size did not become small, but it was confirmed that there was no contaminant on the surface, so that foreign matter was not clogged in the slit, so that bubbles of a uniform size could be generated. .
  • air bubbles were formed using the diffuser pipe (d) of the present invention, which consisted of a diffuser pipe (a) using a conventional single-layer membrane, a first layer having a shore A hardness of 60, and a second layer having a shore A hardness of 70, as inner and outer layers. incidence was compared.

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  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)

Abstract

Une membrane pour un diffuseur d'air selon la présente invention présente une structure multicouche ou monocouche comprenant deux couches de caoutchouc de dureté différente, et peut ainsi générer des microbulles d'air dont la taille ne dépasse pas 1 mm, possède une excellente efficacité de transfert d'oxygène avec laquelle l'oxygène de l'air est dissous dans les eaux usées, et renforce la durabilité d'une fente pour empêcher les parties qui sont soumises à une pression d'air élevée de se déchirer facilement, ce qui a pour effet de retarder le remplacement du produit. En outre, le poinçonnage de trous d'air minuscules est possible de telle sorte que la déformation permanente par compression, qui est un défaut des membranes à base d'EPDM, est considérablement atténuée lorsque l'entrée d'air est interrompue, et la membrane a donc pour effet d'empêcher le reflux des eaux usées dans le diffuseur à membrane.
PCT/KR2021/007640 2020-07-01 2021-06-17 Membrane pour diffuseur d'air comprenant deux types de caoutchouc WO2022005063A1 (fr)

Applications Claiming Priority (2)

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KR10-2020-0081175 2020-07-01
KR1020200081175A KR102216756B1 (ko) 2020-07-01 2020-07-01 2종의 고무를 포함하는 산기관용 멤브레인

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Publication number Priority date Publication date Assignee Title
KR102216756B1 (ko) * 2020-07-01 2021-02-17 (주)효광테크 2종의 고무를 포함하는 산기관용 멤브레인
KR102634139B1 (ko) * 2022-12-29 2024-02-06 주식회사 환경솔루션 다층구조의 공기분배막이 구비되는 멤브레인 산기관

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2153883A1 (fr) * 2008-08-07 2010-02-17 Thomas Edward Frankel Membrane de diffuseur de gaz élastomère fluoré
KR101230058B1 (ko) * 2012-08-23 2013-02-05 (주)에코원테크놀로지 신축성 및 내구성이 향상된 산기관 멤브레인 제조방법 및 이로 제조된 고효율 산기관 멤브레인
KR20160021157A (ko) * 2016-01-28 2016-02-24 강성일 일회용 멤브레인 산기관
KR101979318B1 (ko) * 2018-10-26 2019-08-28 미래그린텍 주식회사 보호망이 결합된 디스크형 멤브레인 산기장치
KR102030476B1 (ko) * 2019-01-22 2019-11-08 미래그린텍 주식회사 방오 기능을 가지는 멤브레인 산기장치
KR102216756B1 (ko) * 2020-07-01 2021-02-17 (주)효광테크 2종의 고무를 포함하는 산기관용 멤브레인

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2153883A1 (fr) * 2008-08-07 2010-02-17 Thomas Edward Frankel Membrane de diffuseur de gaz élastomère fluoré
KR101230058B1 (ko) * 2012-08-23 2013-02-05 (주)에코원테크놀로지 신축성 및 내구성이 향상된 산기관 멤브레인 제조방법 및 이로 제조된 고효율 산기관 멤브레인
KR20160021157A (ko) * 2016-01-28 2016-02-24 강성일 일회용 멤브레인 산기관
KR101979318B1 (ko) * 2018-10-26 2019-08-28 미래그린텍 주식회사 보호망이 결합된 디스크형 멤브레인 산기장치
KR102030476B1 (ko) * 2019-01-22 2019-11-08 미래그린텍 주식회사 방오 기능을 가지는 멤브레인 산기장치
KR102216756B1 (ko) * 2020-07-01 2021-02-17 (주)효광테크 2종의 고무를 포함하는 산기관용 멤브레인

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