WO2022092610A1 - Diffuseur d'air - Google Patents

Diffuseur d'air Download PDF

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Publication number
WO2022092610A1
WO2022092610A1 PCT/KR2021/013747 KR2021013747W WO2022092610A1 WO 2022092610 A1 WO2022092610 A1 WO 2022092610A1 KR 2021013747 W KR2021013747 W KR 2021013747W WO 2022092610 A1 WO2022092610 A1 WO 2022092610A1
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WO
WIPO (PCT)
Prior art keywords
air
diffuser
hole
vertical direction
surface part
Prior art date
Application number
PCT/KR2021/013747
Other languages
English (en)
Korean (ko)
Inventor
구영림
김성민
이경모
Original Assignee
롯데케미칼 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 롯데케미칼 주식회사 filed Critical 롯데케미칼 주식회사
Publication of WO2022092610A1 publication Critical patent/WO2022092610A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/08—Prevention of membrane fouling or of concentration polarisation
    • 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
    • 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
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1268—Membrane bioreactor systems
    • C02F3/1273—Submerged membrane bioreactors
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/18—Use of gases
    • B01D2321/185—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 an air diffuser. More specifically, the present invention relates to an aeration device installed under an immersion type separation membrane to prevent clogging of the separation membrane.
  • an aeration device is installed at the bottom of the separation membrane and air is injected to desorb the contaminants on the surface.
  • the air diffuser is based on a circular pipe shape, and a plurality of holes are drilled at regular intervals so that the air bubbles are dispersed throughout the separation membrane.
  • a sludge discharge hole or elbow type pipe is added to the air diffuser device having a circular pipe shape. If the sludge is deposited in a part without a discharge hole and the pipe is long, the sludge can be removed by pushing it. There is a problem that it is difficult to supply enough air.
  • Korean Patent Application Laid-Open No. 10-2017-0104005 discloses an air diffuser, an operating method thereof, and a water treatment apparatus.
  • TMP transmembrane pressure
  • One aspect of the present invention relates to an air diffuser.
  • the diffuser includes a buffer space formed on the inside, and a plurality of diffuser holes perforated in the vertical direction on the outside of which are alternately arranged in the longitudinal direction; a right side portion connected from one side of the upper surface portion and extending in a vertical direction; a left side facing the right side, connected to the top side and extending in a vertical direction; a front portion formed at the longitudinal end of the upper surface portion and formed with an air supply port on one side; and a rear portion facing the front portion, connected to the upper surface portion, and having an air exhaust hole formed on one side.
  • the right-side portion and the left-side portion extending from the upper surface portion are in contact with the front portion and the rear portion and at least one surface to form a closed space inside, and the lower portion is opened to form an open surface can be
  • the upper surface portion has a concave arc shape, and a buffer space in which the air supplied from the air supply port stays may be formed inside.
  • the acid air hole may be disposed between 40 and 60° with respect to the central axis y passing through the uppermost end of the upper surface part.
  • the diffuser hole may be provided with a guide pipe extending outward from the upper surface to guide the air flow in the vertical direction.
  • the guide tube may be disposed at a height lower than the uppermost end of the upper surface part.
  • the air supply port may be disposed at the lower end of the front part.
  • the air exhaust hole is disposed on the upper portion of the rear surface, and may be formed at a height equal to or higher than the diffuser hole with respect to the lower end surface.
  • the diameter of the air supply port may be larger than the diameter of the air discharge hole.
  • an aerator that is spaced apart from the upper side of the upper surface part and intermittently generates air bubbles may be further disposed.
  • the increase rate of the transmembrane pressure (TMP) is increased during continuous aeration of wastewater containing 6 to 10 g/L of mixed liquor suspended solids (MLSS). It can be less than 15%.
  • the present invention can prevent sludge accumulation in the aeration device, and provides a buffer space in the aeration device even when the air supply amount is reduced so that the bubbles are uniformly dispersed, and the air flow variation is reduced to prevent the aeration pores from being closed. can be effectively prevented.
  • FIG. 1 is a perspective view of an air diffuser according to an embodiment of the present invention.
  • FIG. 2 is a plan view of the air diffuser according to FIG. 1 .
  • FIG. 3 is a front view of the air diffuser according to FIG. 1 .
  • FIG. 4 is a rear view of the air diffuser according to FIG. 1 .
  • FIG. 5 is a perspective view of an air diffuser according to another embodiment of the present invention.
  • FIG. 6 is a front view of the air diffuser according to FIG. 5 .
  • FIG. 7 is a rear view of the air diffuser according to FIG. 5 .
  • FIG. 8 is a schematic view showing the sludge accumulation direction according to the type of the air diffuser.
  • FIG. 9 is a schematic diagram comparing the case in which a concave arc is provided on the upper surface of the air diffuser according to an embodiment of the present invention to show a buffer space in which air resides, and the case in which the air diffuser is formed at the top of the pipe type air diffuser.
  • FIG. 10 is a schematic diagram showing air flow according to the angle of formation of the air diffuser in the pipe type diffuser.
  • FIG. 11 is a schematic view showing the direction of perforation of the diffuser in the diffuser according to one embodiment of the present invention.
  • FIG. 12 is a schematic diagram showing the configuration of an immersion type separation membrane module including an air diffuser according to an embodiment of the present invention.
  • TMP transmembrane pressure
  • Positional relationships such as 'upper', 'top', 'lower', and 'bottom' are only described based on the drawings, and do not represent absolute positional relationships. That is, the positions of 'upper' and 'lower' or 'upper surface' and 'lower surface' may be changed according to the observed position.
  • FIG. 1 is a perspective view of an air diffuser according to an embodiment of the present invention
  • FIG. 2 is a plan view of the diffuser according to FIG. 1
  • FIG. 3 is a front view of the diffuser according to FIG. 1
  • FIG. 4 is the above view It is a rear view of the diffuser according to 1 .
  • the diffuser 1000 includes an upper surface portion 100 , a right surface portion 200 , a left surface portion 300 , a front portion 400 , and a rear surface portion 500 .
  • the air diffuser 1000 is used to generate bubbles in a bioreactor equipped with a separation membrane in a water treatment facility using the membrane separation activated sludge method.
  • the air diffuser 1000 is disposed under the immersion-type separation membrane disposed in the bioreactor to physically clean the separation membrane by spraying air bubbles.
  • the upper surface part 100 has a buffer space b formed on the inside, and a plurality of diffuser holes 110 perforated in the vertical direction on the outside are alternately arranged in the longitudinal direction.
  • the right side part 200 is connected from one side of the top surface part 100 and extends in a vertical direction.
  • the left side portion 300 faces the front portion 200 , and is connected to the top surface portion 100 to extend in a vertical direction.
  • the left side part 300 and the right side part 200 respectively extending from the upper surface part 100 are in contact with the front part 400 and the rear part 500 and at least one surface to form a closed space inside, and the lower part is opened to form an open surface.
  • the diffuser 1000 may have a length of 400 to 1,000 mm, and a width of 20 to 60 mm, preferably 25 to 50 mm.
  • the length of the diffuser 1000 may be changed according to the module size, but is not limited to the above range.
  • the width of the diffuser 1000 is less than 20 mm, internal resistance increases and the diffuser effect may be reduced. If the width exceeds 60 mm, a larger amount of air is required for uniform diffusion, thereby reducing economic efficiency.
  • the upper surface portion 100 has a curvature so that a concave arc is formed on the inside, and a buffer space in which the air supplied to the inside stays is formed.
  • the upper surface portion 100 may have a buffer space (b) formed therein, is not limited to an arc shape, and may be provided in a polygonal structure.
  • the upper surface part 100, the right side part 200, and the left side part 300 are connected to each other and, when viewed from the left or right, shows an inverted 'U' shape, and the lower part is open An open surface is formed.
  • FIG. 8 is a schematic view showing the sludge accumulation direction according to the type of the aerator.
  • FIG. 8 shows the sedimentation of sludge in the conventional pipe-type air diffuser, (b) shows the sludge sedimentation in the elbow-type pipe to which the pipe is connected, and (c) the reverse 'U' A ruler-shaped diffuser is shown.
  • the conventional pipe-type diffuser has a problem in that the sludge (s) gradually settles and eventually closes the sludge discharge hole, and even in the case of an elbow connected to a pipe, there is a problem in that the sludge is deposited in the bent portion.
  • Fig. 8(c) in the case of an inverted 'U' shape, a continuously open lower surface is formed, and when the lower surface is completely opened while the air is discharged through the air diffuser hole 110 of the upper surface, the sludge is discharged from the diffuser. does not settle inside.
  • FIG. 9 is a schematic diagram comparing the case in which a concave arc is provided on the upper surface of the air diffuser according to an embodiment of the present invention to show a buffer space in which air is stored, and the case in which the diffuser hole 110 is formed at the top of the pipe type air diffuser. .
  • TMP transmembrane pressure
  • the bubbles discharged from the diffusion pores are a driving force that disturbs the wastewater around the separation membrane, and it is a very important factor that the bubbles are uniformly generated to prevent the solid particles from being deposited in the micropores of the separation membrane by inducing collision of the separation membrane with the bubbles, If the bubbles are not uniform, the deposition of contaminants is accelerated.
  • the buffer space (b) has the advantage that continuous aeration is possible even during the rest period because the air already remaining is preferentially discharged to generate bubbles even when the amount of supplied air is reduced.
  • a diffuser hole 110 through which the supplied air is discharged in a vertical direction is disposed on the outside of the upper surface part 100 .
  • FIG. 10 is a schematic diagram showing air flow according to the angle of formation of the diffuser hole 110 in the pipe type diffuser.
  • the introduced air floats vertically and no interference with the air flow F 2 occurs.
  • the aeration hole 110 When the aeration hole 110 is formed in the vertical direction, there is no interference with the air flow F 2 , and it is possible to delay the clogging of the aeration hole 110 by sludge settling in the lower part of the reactor, but at the top of the aeration device When the diffuser pores 110 are formed in the vertical direction, uniform air distribution is difficult when the amount of supplied air is reduced.
  • the diffuser hole 110 is formed by being perforated at an angle of 60 ⁇ with respect to the vertical direction (y) of the diffuser device, the discharged air flows through the air flow (F 1 ) due to friction with the diffuser hole 110 rim. In the long term, the sludge in the reactor is deposited and clogging occurs.
  • the diffuser hole 110 is perforated in a direction perpendicular to gravity.
  • FIG. 11 is a schematic diagram showing the direction of perforation of the diffuser hole 110 in the diffuser device according to an embodiment of the present invention.
  • the diffuse hole 110 may be disposed between 40 and 60° with respect to the central axis y passing through the uppermost end of the upper surface part 100 .
  • the angle ( ⁇ ) with respect to the central axis (y) with an imaginary line passing through the center of the diffuser hole 110 is 40 to 60 °.
  • the volume of the buffer space (b) is reduced and uniform air distribution is difficult. 110) is not easy to drill so that the direction is vertical.
  • the diffuser hole 110 is formed by being perforated in the vertical direction, referring to FIG. 11 ( b ), a guide tube 111 may be additionally disposed, and referring to FIG. It is also possible to form a perforation close to the.
  • the buffer space b 0 is formed from the inside of the uppermost end of the concave arc to the position where the diffuser hole 110 is formed, and in (b) the buffer space b 1 is the lowest height of the guide tube 111 .
  • the buffer space is increased, and in (c), the buffer space (b 2 ) may have the diffuser hole 110 located at the bottom of the upper surface part 100 , and in this case, the buffer space may be further increased.
  • the size of the volume of the buffer space may be b 2 > b 1 > b 0 .
  • the diffused pores 110 are arranged to be alternated with each other in the longitudinal direction (x-axis direction).
  • the air gaps 110 are alternately arranged in the longitudinal direction and arranged in a zigzag manner.
  • the disposition of the diffuser hole 110 may be disposed on the left, right, or left and right sides of the central portion of the upper surface portion 100 .
  • the diffuser pores 110 are arranged alternately with each other, it is effective for uniform air distribution, and since it is possible to minimize the influence of the air bubbles generated in the diffuser pores 110 to each other, the aeration effect can be increased.
  • the diameter of the acid air hole 110 is 3 to 10 mm, preferably 4 to 7 mm.
  • the diameter of the diffuser hole 110 is less than 3mm, it may be easily blocked by sludge, and if it exceeds 10mm, it is difficult to expect a uniform diffuser effect.
  • One air hole 110 per 50 to 100 mm, preferably one per 70 to 100 mm, along the longitudinal direction of the upper surface part 100 may be disposed.
  • the diffuser hole 110 may be provided with a guide pipe 111 extending outward from the upper surface part 100 to guide the air flow in the vertical direction.
  • the guide tube 111 starts from the inside of the concave arc and extends to the outside of the upper surface part 100 .
  • the air staying in the buffer space moves through the guide tube 111, which is very advantageous because the air flow is in a vertical direction.
  • the guide tube 111 may be disposed at a height lower than the uppermost end of the upper surface portion 100 .
  • the height (h 0 ) to the uppermost end of the guide tube 111 is the height of the upper surface portion 100 based on the connection line (a) where the upper surface portion 100 is coupled to the front portion 200 and the rear portion 300. lower than (h 1 ).
  • the guide tube 111 When the guide tube 111 is extended to a place higher than the uppermost end of the upper surface part 100, the guide tube 111 is long and not easy to install, and the flow of air is rather inhibited as the length of the guide tube 111 increases. and aeration is not performed smoothly to the outside of the upper surface part 100, so there is a risk that sludge may be deposited on the outer surface.
  • the guide tube 111 has a shape protruding vertically from the upper surface portion 100 when viewed from the front portion 400 or the rear portion 500 .
  • the guide tube 111 protrudes outward from the upper surface portion 100, but is disposed lower than the uppermost height of the upper surface portion 100 and does not affect the flow of air.
  • the front portion 400 is formed at the longitudinal end of the upper surface portion 100, and an air supply port 410 is formed on one side.
  • the air supply port 410 introduces air generated by the blower (B) into the air diffuser.
  • the air supply port 410 is mainly disposed at the lower end of the front portion 400, but is not limited thereto.
  • the position of the supply port is not limited.
  • the air supply port 410 when the air introduced into the air supply port 410 is discharged along the diffuser hole 110 as it is from the diffuser hole 110 closest to the air supply port 410 without passing through the buffer space b, the air supply It is necessary to adjust the position of the sphere 410 or the first diffuse pore.
  • the rear portion 500 faces the front portion 400 , is connected to the upper surface portion 100 , and has an air exhaust hole 510 formed on one side thereof.
  • the air outlet hole 510 is disposed on the upper portion of the rear portion 500, and may be formed at a height equal to or higher than the inner height of the diffuser hole 110 with respect to the lower end surface.
  • the air discharge hole 510 allows the air remaining in the air diffuser to be discharged to sufficiently wet the inside of the air diffuser when air supply to the air diffuser is stopped, such as during a rest period.
  • the air discharge hole 510 When the air discharge hole 510 is disposed on the rear surface portion 500 and is located opposite the air supply port 410, the air discharged through the buffer space and the remaining air can be discharged, so that the amount of bubbles generated can be adjusted.
  • the diameter d 1 of the air supply hole 410 may be greater than the diameter d 2 of the air outlet hole 510 .
  • FIG. 5 is a perspective view of a diffuser according to another embodiment of the present invention
  • FIG. 6 is a front view of the diffuser according to FIG. 5
  • FIG. 7 is a rear view of the diffuser according to FIG.
  • the diffuser hole 110 may be formed by integrally molding the diffuser device in the vertical direction to the upper surface portion 100 .
  • the manufacturing efficiency is greatly increased, and the air diffuser hole 110 can be completed without drilling so that the air flow is in the vertical direction.
  • an aerator 700 that is spaced apart from the upper side of the upper surface part and intermittently generates air bubbles may be further provided.
  • FIG. 12 is a schematic diagram showing the configuration of an immersion type separation membrane module including an air diffuser according to an embodiment of the present invention.
  • an aerator 700 is provided above the upper surface part 100 of the air diffuser 1000 , and is disposed under the separation membrane 800 .
  • the aerator 700 may be designed so that the air bubbles generated by the aerator 1000 are introduced and maintained for a certain period of time and then discharged through the opening of the upper plate for a short time.
  • the aeration device may increase the transmembrane pressure (TMP) increase rate within 15% during continuous aeration for 129 days for wastewater containing 6 to 10 g/L of activated sludge suspended solids (MLSS).
  • TMP transmembrane pressure
  • the diffuser hole 110 is not easily blocked even during long-term operation by the diffuser hole 110 for discharging air in the vertical direction to the buffer space b, so that the aeration efficiency is increased due to the uniform generation of air bubbles, Since fouling of the separator is prevented, the increase rate of the transmembrane pressure is remarkably reduced.
  • a total of 8 diffuser holes with a diameter of 4.5 mm were drilled in the vertical direction in the upper surface of the diffuser with a length of 800 mm and a width of 50 mm.
  • the air gaps were formed alternately in a zigzag pattern, and the horizontal distance from each air hole was set to 100 mm.
  • a pipe-shaped diffuser was formed by perforating 4 holes in the left 60 ⁇ direction and 4 in the right 60 ⁇ direction with a 3.5 mm diameter diffuser hole in a transparent pipe with a length of 800 mm and a diameter of 27 mm.
  • the pipe-type diffuser was formed by perforating 4 holes in the 60° left direction and 4 holes in the right 60° direction based on the vertical axis with a size of 4.5 mm.
  • TMP transmembrane pressure
  • the transmembrane pressure (TMP, kPa at 20 °C) of the separation membrane was continuously measured.
  • Table 1 shows the results of measuring the transmembrane pressure of Example 1 and Comparative Examples 1 and 2.
  • TMP transmembrane pressure
  • TMP transmembrane pressure
  • the air diffuser induces the flow of air in the vertical direction to uniformly generate air bubbles, thereby increasing the aeration effect, and preventing sludge from accumulating and clogging the air diffuser.
  • a buffer space so that the air supplied to the inside stays constant first, air is continuously discharged even when the amount of air inflow is reduced, and uniform bubbles are generated in the aeration pores to prevent contamination of the separation membrane and during continuous aeration for a long period of time It can also have the effect of significantly lowering the increase in the transmembrane pressure.

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

Abstract

Un diffuseur d'air de la présente invention comprend : une partie de surface supérieure comprenant un espace tampon formé à l'intérieur de celle-ci, et comprenant une pluralité de trous de diffusion d'air formés dans la direction verticale et agencés sur le côté externe de celui-ci de façon à être alternés l'un avec l'autre dans la direction longitudinale ; une partie de surface droite reliée d'un côté de la partie de surface supérieure, et étendue dans la direction verticale ; une partie de surface gauche qui fait face à une partie de surface avant, et qui est reliée à la partie de surface supérieure de façon à être étendue dans la direction verticale ; la partie de surface avant qui est formée au niveau de l'extrémité de la partie de surface supérieure dans la direction longitudinale, et qui comprend un orifice d'alimentation en air formé sur un côté de celle-ci ; et une partie de surface arrière, qui fait face à la partie de surface avant, est reliée à la partie de surface supérieure, et comprend un trou d'évacuation d'air formé sur un côté de celle-ci.
PCT/KR2021/013747 2020-10-29 2021-10-07 Diffuseur d'air WO2022092610A1 (fr)

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Application Number Priority Date Filing Date Title
KR1020200141655A KR102607518B1 (ko) 2020-10-29 2020-10-29 산기장치
KR10-2020-0141655 2020-10-29

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WO2022092610A1 true WO2022092610A1 (fr) 2022-05-05

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050047230A (ko) * 2003-11-17 2005-05-20 주식회사 코오롱 침지형 중공사막 모듈
KR20150034598A (ko) * 2013-09-26 2015-04-03 미쯔비시 레이온 가부시끼가이샤 산기 장치 및 수처리 장치
US20150290590A1 (en) * 2012-10-25 2015-10-15 Mitsubishi Rayon Co., Ltd. Aeration device, operation method therefor, and water treatment apparatus
KR20160000791A (ko) * 2014-06-25 2016-01-05 롯데케미칼 주식회사 산기관
KR20160051712A (ko) * 2016-04-25 2016-05-11 롯데케미칼 주식회사 공기 분배기 및 그 제조방법

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4216373B2 (ja) * 1998-08-13 2009-01-28 三菱レイヨン株式会社 活性汚泥処理装置
KR101771863B1 (ko) * 2016-10-24 2017-08-25 롯데케미칼 주식회사 산기관

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050047230A (ko) * 2003-11-17 2005-05-20 주식회사 코오롱 침지형 중공사막 모듈
US20150290590A1 (en) * 2012-10-25 2015-10-15 Mitsubishi Rayon Co., Ltd. Aeration device, operation method therefor, and water treatment apparatus
KR20150034598A (ko) * 2013-09-26 2015-04-03 미쯔비시 레이온 가부시끼가이샤 산기 장치 및 수처리 장치
KR20160000791A (ko) * 2014-06-25 2016-01-05 롯데케미칼 주식회사 산기관
KR20160051712A (ko) * 2016-04-25 2016-05-11 롯데케미칼 주식회사 공기 분배기 및 그 제조방법

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