WO2015125245A1 - 散気装置及び散気方法 - Google Patents
散気装置及び散気方法 Download PDFInfo
- Publication number
- WO2015125245A1 WO2015125245A1 PCT/JP2014/054000 JP2014054000W WO2015125245A1 WO 2015125245 A1 WO2015125245 A1 WO 2015125245A1 JP 2014054000 W JP2014054000 W JP 2014054000W WO 2015125245 A1 WO2015125245 A1 WO 2015125245A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- air
- diffuser
- slits
- membrane
- air diffuser
- Prior art date
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Classifications
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2312—Diffusers
- B01F23/23124—Diffusers consisting of flexible porous or perforated material, e.g. fabric
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2312—Diffusers
- B01F23/23126—Diffusers characterised by the shape of the diffuser element
- B01F23/231265—Diffusers characterised by the shape of the diffuser element being tubes, tubular elements, cylindrical elements or set of tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2215/00—Auxiliary or complementary information in relation with mixing
- B01F2215/04—Technical information in relation with mixing
- B01F2215/0413—Numerical information
- B01F2215/0418—Geometrical information
- B01F2215/0431—Numerical size values, e.g. diameter of a hole or conduit, area, volume, length, width, or ratios thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2215/00—Auxiliary or complementary information in relation with mixing
- B01F2215/04—Technical information in relation with mixing
- B01F2215/0413—Numerical information
- B01F2215/0436—Operational information
- B01F2215/045—Numerical flow-rate values
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- 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 tube-type membrane diffuser installed in a tank of a sewage treatment facility or the like, and more particularly to an diffuser provided with a large number of slits in a diffuser membrane.
- the present invention also relates to an aeration method using the aeration device.
- a membrane diffuser using various rubbers is known. Since these bubbles have a small diameter, they have higher oxygen transfer efficiency than conventional diffusers and are less likely to be clogged, so they are used in many water treatments.
- Oxygen transfer efficiency increases as the diameter of bubbles diffused from the diffuser decreases. For this purpose, it is necessary to reduce the hole diameter or the slit length. In this case, however, the pressure loss increases and the load on the blower increases.
- Patent Document 1 uses a tube-type membrane air diffuser having a slit length of 2 mm or less, a ventilation resistance of 10 kPa or less, and 13 Nm 3 / m 2 / hr or less. A diffuser method for venting is described. In this air diffusion method of Patent Document 1, an increase in pressure loss is prevented by reducing the amount of air per membrane surface.
- FIG. 5 is a side view in which a part of the air diffuser (tube type membrane diffuser) described in Patent Document 1 is a longitudinal section.
- An adapter 15 is connected to an opening on one end side of a resin or metal tube base material 11 constituting the tube type membrane diffuser 10.
- the adapter 15 has a first closing portion 16 and a second closing portion 17 that close the opening on the one end side, and a ventilation chamber 20 is formed between the first closing portion 16 and the second closing portion 17. ing.
- the second closing portion 17 has a vent pipe 18 having a first vent 18 a connected to an air supply source.
- a plurality of second vents 19 are formed on the peripheral wall 21 of the vent chamber 20. Yes.
- the opening 11a on the other end side of the tube base 11 is open.
- the entire outer surfaces of the tube base material 11 and the adapter 15 are covered with an elastic film (elastic film) 25.
- the elastic film 25 is a film made of ethylene propylene rubber or the like and having a thickness of about 1.0 to 3.0 mm.
- the slit 26 has a length of 2 mm or less, preferably 1 mm or less, from the viewpoint of generating bubbles with a narrow distribution width and a uniform diameter as much as possible.
- the distribution density of the slits 26 is 1 to 100 / cm 2 .
- the elastic film 25 covering the vicinity of the tube base opening 11a and the upper portion thereof is fixed by tightening the metal band 31 from the outside, and the first closing portion 17 of the adapter and the elastic film 25 covering the upper portion are fixed from the outside. It is fixed by tightening with a metal band 32.
- the parts other than those fixed by the metal bands 31 and 32 are not fixed.
- An object of the present invention is to provide an air diffuser capable of generating a large amount of fine bubbles and having a small increase in pressure loss even when the amount of ventilation is increased, and an air diffuser using the air diffuser. .
- the air diffuser of the present invention is a tube-type membrane air diffuser having a tube base material and an elastic membrane formed with a large number of slits for generating fine bubbles covering the tube base material. Has a length of 0.5 mm or less, and 200,000 to 600,000 pieces are provided per 1 m 2 of the film surface.
- the thickness of the elastic film is 0.5 to 3 mm and the length of the slit is 0.3 to 0.5 mm.
- the air diffusing method of the present invention is to ventilate the air diffusing device at a unit membrane area air flow rate of 15 Nm 3 / m 2 / hr or more.
- the unit membrane area aeration rate is preferably 15 to 40 Nm 3 / m 2 / hr.
- the length of slits provided in the elastic membrane is 0.5 mm or less, and the number of slits per 1 m 2 of the membrane surface is 200,000 to 600,000 pieces / m 2 , so that the pressure loss is increased so much even at a high air flow rate. Fine bubbles can be generated, and high oxygen transfer efficiency can be obtained.
- polyurethane, EPDM, or silicon rubber having a thickness of 0.5 to 3.0 mm as the elastic film, sufficient strength can be obtained even if the number of slits is increased.
- the air diffuser of the present invention has a tube base material and an elastic film covering the tube base material, and a plurality of slits are provided in the elastic film. is there.
- a tube base material having a diameter of about 50 to 120 mm and a length of about 500 to 1000 mm is suitable.
- the slit has a length of 0.5 mm or less, preferably 0.3 to 0.5 mm, and 200,000 to 600,000, preferably 200,000 to 400,000 are provided per 1 m 2 of the elastic membrane. It is done.
- the elastic membrane is preferably made of polyurethane, ethylene propylene rubber, or silicon rubber and having a thickness of 0.5 to 3 mm, particularly 0.5 to 1 mm.
- the slit arrangement may be all parallel as shown in FIGS. 1 and 2, or may be provided in an intersecting manner as shown in FIGS. 1 indicates the length of the slit 2.
- all the slits 2 are arranged in the horizontal direction (hereinafter, also referred to as X direction) in the figure.
- X direction also referred to as X direction
- the slits 2 are arranged in a zigzag pattern
- the slits 2 are arranged in a grid pattern.
- the slits 2 in the X direction and the slits 3 in the Y direction are alternately arranged in both the X direction and the Y direction.
- two X-direction slits 2 and 2 and two Y-direction slits 3 and 3 are paired, and X-direction pairs and Y-direction pairs are alternately arranged in the X-direction and Y-direction. Yes.
- two slits are paired, but three or more slits may be a set.
- the slit arrangement shown in FIGS. 1 to 4 is an example, and the present invention may have a slit arrangement other than that shown in the figure.
- the unit membrane area aeration rate (aeration rate per 1 m 2 of membrane) is 15 Nm 3 / m 2 / hr or more, preferably 15 to 40 Nm 3 / m 2 / hr, with respect to this aeration apparatus. Ventilate so that As a result, fine bubbles are generated from the air diffuser and an increase in pressure loss is also suppressed.
- Examples 1 to 3 Comparative Examples 1 to 5
- a cylindrical tube substrate having a diameter of 90 mm and a length of 760 mm is attached with an elastic membrane (membrane area 0.18 m 2 , thickness 0.8 mm, material polyurethane) having the structure shown in Table 1 shown in FIG. Qi device was configured.
- Each air diffuser was immersed in a water tank filled with fresh water (tank capacity 1.6 m 3 (1 m ⁇ 0.4 m ⁇ depth 4 m)).
- Table 1 shows oxygen transfer efficiency (calculated from kLa), pressure loss, oxygen dissolution power efficiency determined from these, and oxygen transfer amount.
- Comparative Example 2 in which the length of the slit is 1 mm and Comparative Example 3 in which the number of slits is 150,000 / m 2 , the performance is improved as compared with Comparative Example 1, but both remain at about 1.2 times. .
- Comparative Example 4 in which the air flow was reduced, the power efficiency was higher than in Examples 1 to 3, but the oxygen transfer amount was reduced to about 60% of that in Comparative Example 1. Therefore, for example, when the biological treatment tank is operated at a BOD volume load of 2 kg / m 3 / d, oxygen supply becomes insufficient in consideration of a decrease in dissolution efficiency in sludge, and it is necessary to increase the number of diffusers. .
- Comparative Example 5 in which the number of slits was increased to 800,000 / m 2 , the pressure loss was reduced, but the oxygen transfer efficiency was lowered, and the improvement in the oxygen transfer amount was only about 1.3 times that of Comparative Example 1. It was. In addition, when the manner in which air bubbles emerged from the air diffuser was observed, it was found that the generated air bubbles were associated with each other on the film surface because the slits were too dense.
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (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)
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
直径90mm、長さ760mmの円筒形のチューブ基材に対し、図1に示した表1の構成の弾性膜(膜面積0.18m2、厚さ0.8mm、材質ポリウレタン)を装着して散気装置を構成した。各散気装置を、清水を満たした水槽(槽容量1.6m3(1m×0.4m×深さ4m))に浸漬した。そして、比較例4以外は通気量6Nm3/hr(33Nm3/m2/hr)とし、比較例4のみ通気量2Nm3/hr(11Nm3/m2/hr)にて空気を通気して、圧力損失を測定した。
本出願は、2012年11月26日付で出願された日本特許出願2012-257569に基づいており、その全体が引用により援用される。
Claims (4)
- チューブ基材と、該チューブ基材を覆う微細気泡を発生させるための多数のスリットが形成された弾性膜とを有するチューブ型メンブレン式の散気装置において、該スリットは、長さが0.5mm以下であり、膜面1m2あたり20万~60万個設けられていることを特徴とする散気装置。
- 請求項1において、弾性膜の厚さが0.5~3mmであり、該スリットの長さが0.3~0.5mmであることを特徴とする散気装置。
- 請求項1又は2の散気装置に対し、単位膜面積通気量15Nm3/m2/hr以上で通気を行う散気方法。
- 請求項3において、単位膜面積通気量を15~40Nm3/m2/hrとすることを特徴とする散気方法。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2014/054000 WO2015125245A1 (ja) | 2014-02-20 | 2014-02-20 | 散気装置及び散気方法 |
KR1020167021161A KR102198651B1 (ko) | 2014-02-20 | 2014-02-20 | 산기 장치 및 산기 방법 |
CN201480074002.3A CN105934411B (zh) | 2014-02-20 | 2014-02-20 | 散气装置以及散气方法 |
Applications Claiming Priority (1)
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PCT/JP2014/054000 WO2015125245A1 (ja) | 2014-02-20 | 2014-02-20 | 散気装置及び散気方法 |
Publications (1)
Publication Number | Publication Date |
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WO2015125245A1 true WO2015125245A1 (ja) | 2015-08-27 |
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PCT/JP2014/054000 WO2015125245A1 (ja) | 2014-02-20 | 2014-02-20 | 散気装置及び散気方法 |
Country Status (3)
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KR (1) | KR102198651B1 (ja) |
CN (1) | CN105934411B (ja) |
WO (1) | WO2015125245A1 (ja) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61245857A (ja) * | 1985-04-22 | 1986-11-01 | Kurita Water Ind Ltd | 散気装置 |
JP2003245684A (ja) * | 2002-02-27 | 2003-09-02 | Hiroyasu Ogawa | メンブラン型散気管を用いた間欠散気による汚水処理法 |
JP2006061817A (ja) * | 2004-08-26 | 2006-03-09 | Jfe Engineering Kk | 散気装置 |
JP2006075771A (ja) * | 2004-09-10 | 2006-03-23 | Daicen Membrane Systems Ltd | 散気用弾性多孔体及び散気装置 |
JP2008221158A (ja) * | 2007-03-14 | 2008-09-25 | Daicen Membrane Systems Ltd | 散気方法及び水処理運転方法 |
JP2013226525A (ja) * | 2012-04-27 | 2013-11-07 | Daicen Membrane Systems Ltd | 散気装置用メンブレン |
-
2014
- 2014-02-20 WO PCT/JP2014/054000 patent/WO2015125245A1/ja active Application Filing
- 2014-02-20 KR KR1020167021161A patent/KR102198651B1/ko active IP Right Grant
- 2014-02-20 CN CN201480074002.3A patent/CN105934411B/zh active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61245857A (ja) * | 1985-04-22 | 1986-11-01 | Kurita Water Ind Ltd | 散気装置 |
JP2003245684A (ja) * | 2002-02-27 | 2003-09-02 | Hiroyasu Ogawa | メンブラン型散気管を用いた間欠散気による汚水処理法 |
JP2006061817A (ja) * | 2004-08-26 | 2006-03-09 | Jfe Engineering Kk | 散気装置 |
JP2006075771A (ja) * | 2004-09-10 | 2006-03-23 | Daicen Membrane Systems Ltd | 散気用弾性多孔体及び散気装置 |
JP2008221158A (ja) * | 2007-03-14 | 2008-09-25 | Daicen Membrane Systems Ltd | 散気方法及び水処理運転方法 |
JP2013226525A (ja) * | 2012-04-27 | 2013-11-07 | Daicen Membrane Systems Ltd | 散気装置用メンブレン |
Also Published As
Publication number | Publication date |
---|---|
KR102198651B1 (ko) | 2021-01-05 |
KR20160121519A (ko) | 2016-10-19 |
CN105934411B (zh) | 2019-06-07 |
CN105934411A (zh) | 2016-09-07 |
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