JPH09117647A - Operation of air diffusion device - Google Patents
Operation of air diffusion deviceInfo
- Publication number
- JPH09117647A JPH09117647A JP7274606A JP27460695A JPH09117647A JP H09117647 A JPH09117647 A JP H09117647A JP 7274606 A JP7274606 A JP 7274606A JP 27460695 A JP27460695 A JP 27460695A JP H09117647 A JPH09117647 A JP H09117647A
- Authority
- JP
- Japan
- Prior art keywords
- air
- liquid
- membrane
- membrane cartridge
- treated
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Classifications
-
- 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
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は散気装置の運転方法
に関し、特に小型合併処理浄化槽などの生活排水処理設
備や活性汚泥法を利用した産業排水処理設備において被
処理液の濾過を行う浸漬型膜カートリッジの下方に配置
される散気装置の運転方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for operating an air diffuser, and more particularly to an immersion type for filtering a liquid to be treated in a domestic wastewater treatment facility such as a small combined treatment septic tank or an industrial wastewater treatment facility utilizing an activated sludge method. The present invention relates to a method of operating an air diffuser arranged below a membrane cartridge.
【０００２】[0002]
【従来の技術】従来、小型合併処理浄化槽などの生活排
水処理設備や活性汚泥法を利用した産業排水処理設備に
おいては、たとえば図１および図２に示したような膜分
離装置を被処理液中に浸漬して設置している。2. Description of the Related Art Conventionally, in a domestic wastewater treatment facility such as a small combined treatment septic tank or an industrial wastewater treatment facility utilizing an activated sludge method, for example, a membrane separation device as shown in FIGS. It is dipped in and installed.
【０００３】膜分離装置は、上下が開口した箱状の膜ケ
ース１の内部に平板状の膜カートリッジ２を適当間隔で
並列に配置し、同じく上下が開口した箱状の散気ケース
３の内部に、槽外のブロワ４などの給気手段に連通した
散気装置としての散気管５を配置し、膜ケース１と散気
ケース３とを互いに上下に分離可能に配置することによ
り構成されている。In the membrane separation device, flat plate-shaped membrane cartridges 2 are arranged in parallel inside a box-shaped membrane case 1 having an opening at the top and bottom, and a box-like air diffusion case 3 having an opening at the top and bottom is also provided. Is provided with an air diffuser pipe 5 as an air diffuser communicating with an air supply means such as a blower 4 outside the tank, and the membrane case 1 and the air diffuser case 3 are vertically separable from each other. There is.
【０００４】膜カートリッジ２は、図２に示したよう
に、濾板６の表面に有機濾過膜７，７を配置して濾板６
と濾過膜７との間を透過水流路８とし、透過水流路８に
連通する吸引チューブ９と集水管１０を設けることによ
り構成されている。そして、集水管１０に連通するよう
に集水ヘッダ管や吸引ポンプなどの吸引手段手段（図示
せず）が設けられている。In the membrane cartridge 2, as shown in FIG. 2, the organic filter membranes 7, 7 are arranged on the surface of the filter plate 6, and the filter plate 6 is provided.
A permeated water channel 8 is provided between the filter membrane 7 and the filtration membrane 7, and a suction tube 9 and a water collection pipe 10 that communicate with the permeated water channel 8 are provided. A suction means (not shown) such as a water collecting header pipe or a suction pump is provided so as to communicate with the water collecting pipe 10.
【０００５】このような膜分離装置を濾過運転する際に
は、吸引手段によって集水管１０，吸引チューブ９を通
じて透過水流路８に吸引圧を負荷することにより、ある
いは膜カートリッジ２より上方の被処理液の水頭を濾過
駆動圧とすることにより、活性汚泥や微粒子などの懸濁
物質１１を濾過膜７で捕捉し、濾過膜７を透過して透過
水流路８内に流入した透過水１２を吸引チューブ９，集
水管１０を通じて処理槽の外部へ取り出している。When performing filtration operation of such a membrane separation device, suction pressure is applied to the permeate flow passage 8 through the water collection pipe 10 and the suction tube 9 by the suction means, or the treated material above the membrane cartridge 2 is treated. By setting the head of the liquid as the filtration driving pressure, the suspended matter 11 such as activated sludge and fine particles is captured by the filtration membrane 7, and the permeated water 12 that permeates the filtration membrane 7 and flows into the permeated water channel 8 is sucked. It is taken out of the treatment tank through the tube 9 and the water collection pipe 10.
【０００６】このとき、ブロワ４より散気管５の散気孔
５ａを通じて被処理液に曝気空気を供給するとともに、
曝気空気の気泡１３によって生起される気液混合上昇流
１４により膜カートリッジ２の膜面全体を均一に擦洗し
て、濾過膜７の表面にケーキ層が堆積するのを防止して
いる。At this time, aeration air is supplied from the blower 4 to the liquid to be treated through the air diffusion holes 5a of the air diffusion pipe 5, and
The entire membrane surface of the membrane cartridge 2 is uniformly rubbed by the gas-liquid mixed upflow 14 generated by the bubbles 13 of the aerated air, thereby preventing the cake layer from being deposited on the surface of the filtration membrane 7.
【０００７】[0007]
【発明が解決しようとする課題】上記したように、膜分
離装置に配置される散気管は、被処理液に対して曝気空
気を供給するものであり、特に活性汚泥処理の場合は曝
気空気中の酸素を微生物に供給することを主たる目的と
している。このため、処理槽への被処理液の流入が少な
い場合などは曝気を低減または停止するようにしてお
り、その他の場合でも、曝気動力の節減を図るために曝
気を停止することがある。As described above, the air diffuser arranged in the membrane separator supplies aeration air to the liquid to be treated, and particularly in the case of activated sludge treatment, the aeration air is used. Its main purpose is to supply oxygen to microorganisms. For this reason, aeration is reduced or stopped when the amount of the liquid to be treated flowing into the treatment tank is small, and in other cases, aeration may be stopped in order to save aeration power.
【０００８】しかるに、このような散気管においては、
連続して空気が噴き出される時には散気孔の閉塞が防止
されるが、曝気が低減または停止された時には被処理液
中の活性汚泥や微粒子が管内に逆流して散気孔が閉塞し
やすくなる。一部の散気孔が閉塞すると、給気手段より
散気管内に供給された空気は閉塞していない散気孔から
噴き出すことになり、曝気空気の気泡やそれにより生起
される気液混合上昇流の流れに偏りが生じ、その結果、
流れが供給されない位置の膜カートリッジの膜面には活
性汚泥などが堆積し、膜間閉塞が生じることにもなる。However, in such an air diffuser,
When air is continuously ejected, the diffusion holes are prevented from being blocked, but when the aeration is reduced or stopped, activated sludge and fine particles in the liquid to be treated flow back into the pipe and the diffusion holes are easily blocked. When a part of the diffuser holes is closed, the air supplied from the air supply means into the diffuser pipe is ejected from the open diffuser holes, and the bubbles of the aerated air and the upflow of gas-liquid mixture caused by the bubbles are generated. The flow is biased, resulting in
Activated sludge or the like accumulates on the membrane surface of the membrane cartridge at a position where the flow is not supplied, resulting in clogging between membranes.
【０００９】このため、散気孔の閉塞を防止するための
様々な工夫がなされているが満足できる手段はまだな
く、閉塞した散気孔を回復させるためには、散気管を下
部に配設した膜分離装置全体を処理槽から取り出さねば
ならず、非常に手間暇がかかっているのが現状である。For this reason, various measures have been taken to prevent the clogging of the air diffuser, but there is still no satisfactory means, and in order to recover the blocked air diffuser, a membrane with an air diffusing tube disposed at the bottom is used. At present, it takes a lot of time and effort to take out the entire separation device from the processing tank.
【００１０】本発明は上記課題を解決するもので、散気
孔の閉塞が生じにくい散気装置の運転方法を提供するこ
とを目的とするものである。The present invention has been made to solve the above problems, and an object of the present invention is to provide an operating method of an air diffusing device in which clogging of air diffusing holes is less likely to occur.
【００１１】[0011]
【課題を解決するための手段】上記課題を解決するため
に、本発明の散気装置の運転方法は、被処理液の濾過を
行う浸漬型膜カートリッジの下方に配置され、被処理液
に曝気空気を供給する散気装置の運転方法であって、膜
カートリッジの濾過運転時には、被処理液の処理に必要
な空気量と、膜カートリッジの膜面洗浄に必要な気液混
合上昇流速度と、散気孔の閉塞が生じない空気噴出速度
とを与える量の曝気空気を供給し、膜カートリッジの濾
過運転停止時には、少なくとも散気孔の閉塞が生じない
空気噴出速度を与える量の曝気空気を供給するようにし
たものである。In order to solve the above-mentioned problems, an operating method of an air diffuser of the present invention is arranged below a submerged membrane cartridge for filtering a liquid to be treated and aerated to the liquid to be treated. A method of operating an air diffuser for supplying air, wherein during a filtration operation of a membrane cartridge, an amount of air required for treating a liquid to be treated, a gas-liquid mixing upflow velocity required for cleaning a membrane surface of the membrane cartridge, Aeration air is supplied in an amount that gives an air ejection speed that does not cause clogging of the air diffusion holes, and at least when supplying filtration air to the membrane cartridge, an amount of aeration air that gives an air ejection speed that does not cause clogging of the air diffusion holes is supplied. It is the one.
【００１２】ここで、被処理液の処理に必要な空気量と
は、活性汚泥処理の場合は、少なくとも活性汚泥混合液
を攪拌混合して活性汚泥に必要な酸素を供給できる空気
量を意味し、その他の場合は、少なくとも被処理液を攪
拌混合して被処理液中の気体を大気中に放出させるなど
の周知の処理に必要な空気量を意味する。Here, in the case of activated sludge treatment, the amount of air required for treating the liquid to be treated means the amount of air that can supply at least oxygen required for the activated sludge by stirring and mixing the activated sludge mixed liquid. In other cases, it means the amount of air required for well-known processing such as stirring and mixing at least the liquid to be treated to release the gas in the liquid to be released into the atmosphere.
【００１３】上記した運転方法によれば、膜カートリッ
ジの濾過運転時と濾過運転停止時とにおいて、散気装置
が停止されることなく曝気空気量が変更されることで、
濾過運転停止時における散気孔の閉塞が防止される。According to the above operating method, the aeration air amount is changed without stopping the air diffuser during the filtration operation of the membrane cartridge and during the filtration operation stop,
It is possible to prevent the diffusion holes from being blocked when the filtration operation is stopped.
【００１４】[0014]
【発明の実施の形態】以下、本発明の実施形態を説明す
る。本発明の散気装置の運転方法は、図１と図２を用い
て説明した膜分離装置などにおいて実施されるので、図
示および詳細な説明を省略し、図１と図２に示した符号
を引用して説明する。Embodiments of the present invention will be described below. Since the method for operating the air diffuser of the present invention is carried out in the membrane separation device described with reference to FIGS. 1 and 2, illustration and detailed description thereof will be omitted, and the reference numerals shown in FIGS. Explain by quoting.
【００１５】膜分離装置は、活性汚泥処理槽の内部に設
置されて活性汚泥等の微粒子を分離するものであり、膜
ケース１の内部に膜カートリッジ２を配列し、膜ケース
１の下方に配置した散気ケース３の内部に、ブロワ４な
どの給気手段に連通した散気装置としての散気管５を配
設している。膜カートリッジ２は、活性汚泥等の微粒子
を分離するのに適した孔径１μ以下の精密濾過膜７を備
えており、膜ケース１の内部に５０〜１５０枚を１セッ
トとして配列されている。散気管５は、１セットの膜カ
ートリッジ３に対応するものであって、十〜数十の散気
孔５ａを有している。The membrane separation device is installed inside the activated sludge treatment tank to separate fine particles such as activated sludge. The membrane cartridge 2 is arranged inside the membrane case 1 and arranged below the membrane case 1. Inside the air diffuser case 3, an air diffuser 5 as an air diffuser communicating with an air supply means such as a blower 4 is provided. The membrane cartridge 2 is equipped with a microfiltration membrane 7 having a pore diameter of 1 μm or less suitable for separating fine particles such as activated sludge, and 50 to 150 pieces are arranged inside the membrane case 1 as one set. The air diffuser 5 corresponds to one set of the membrane cartridges 3 and has ten to several tens of air diffuser holes 5a.
【００１６】以下、散気装置の運転方法を説明する。活
性汚泥処理槽の内部において、被処理液を活性汚泥処理
しつつ、膜カートリッジ２を濾過運転して活性汚泥等の
微粒子を分離する。The operation method of the air diffuser will be described below. Inside the activated sludge treatment tank, while subjecting the liquid to be treated to activated sludge, the membrane cartridge 2 is filtered to separate fine particles such as activated sludge.
【００１７】その際には、ブロワ４を運転して散気管５
より、槽内の活性汚泥混合液を攪拌混合して活性汚泥に
必要な酸素を供給できる空気量を与え、かつ、膜カート
リッジ２の膜面洗浄に必要な気液混合上昇流速度を与
え、かつ、散気孔５ａの閉塞が生じない空気噴出速度を
与える量の曝気空気を供給する。At that time, the blower 4 is operated to operate the air diffuser 5
Thereby, the activated sludge mixed solution in the tank is agitated and mixed to give an amount of air capable of supplying oxygen required for the activated sludge, and an upflow velocity of gas-liquid mixture necessary for cleaning the membrane surface of the membrane cartridge 2 is given, and Aeration air is supplied in an amount that provides an air ejection speed that does not cause clogging of the diffuser holes 5a.
【００１８】そして、活性汚泥処理槽への被処理液の流
入が少なくなったら、膜カートリッジ２の濾過運転を停
止する。その際には、ブロワ４の運転を調節して散気管
５より、少なくとも散気孔５ａの閉塞が生じない空気噴
出速度を与え、必要に応じてさらに、槽内の活性汚泥混
合液を攪拌混合して活性汚泥に必要な酸素を供給できる
量の曝気空気を供給する。When the inflow of the liquid to be treated into the activated sludge treatment tank becomes small, the filtration operation of the membrane cartridge 2 is stopped. At that time, the operation of the blower 4 is adjusted to give an air jet speed from the air diffusing pipe 5 so that at least the air diffusing holes 5a are not clogged, and if necessary, the activated sludge mixed liquid in the tank is further stirred and mixed. Aerated air is supplied in an amount sufficient to supply the oxygen required for activated sludge.
【００１９】上記したような運転方法によれば、膜カー
トリッジ２の濾過運転停止時においても、散気装置が停
止されることなく必要量の曝気空気が供給され、散気孔
５ａの閉塞が防止される。According to the above-described operating method, even when the filtration operation of the membrane cartridge 2 is stopped, the required amount of aeration air is supplied without stopping the air diffuser, and the clogging of the air diffuser hole 5a is prevented. It
【００２０】曝気空気量の変更は、ブロワ４などの給気
手段の運転台数を変更してもよいし、あるいは１台の給
気手段を使用してインバータ等で流量を変更してもよ
い。濾過運転時と濾過運転停止時の曝気空気量の比は、
活性汚泥を構成する微生物に必要な酸素量等に関連する
ので一意的に決定できないが、通常、濾過運転時２に対
して濾過運転停止時１以下となる。最小の曝気空気量
は、散気孔の閉塞を防止するためには空気噴出速度を３
ｍ／秒未満にできないという観点より決定される。濾過
運転時の曝気空気量は、膜面洗浄のための気液混合上昇
流速度を０．５ｍ／秒以上とする曝気空気量を一因子と
して決定される。The amount of aeration air may be changed by changing the operating number of air supply means such as the blower 4, or by changing the flow rate by an inverter or the like using one air supply means. The ratio of the amount of aerated air at the time of filtration operation and at the time of filtration operation stop is
Although it cannot be uniquely determined because it is related to the amount of oxygen necessary for the microorganisms constituting the activated sludge, it is usually 1 or less when the filtration operation is stopped and 2 when the filtration operation is stopped. The minimum aeration amount of air is 3 in order to prevent clogging of diffuser holes.
It is determined from the viewpoint that it cannot be less than m / sec. The amount of aerated air at the time of filtration operation is determined by one factor being the amount of aerated air that makes the gas-liquid mixing upward flow velocity for cleaning the membrane surface 0.5 m / sec or more.
【００２１】たとえば、２００人の生活排水を処理する
処理槽を設置した生活排水処理設備では、処理槽の内部
に１５０枚の膜カートリッジを設置し、散気装置を、濾
過運転時の曝気空気量を２．０ｍ3 ／分とし、濾過運転
停止時の曝気空気量を０．７５ｍ3 ／分として運転する
ようにしている。For example, in a domestic wastewater treatment facility equipped with a treatment tank for treating domestic wastewater of 200 people, 150 membrane cartridges are installed inside the treatment tank, and an air diffuser is used to aerate the amount of aerated air during filtration operation. Is 2.0 m 3 / min, and the amount of aerated air when the filtration operation is stopped is 0.75 m 3 / min.
【００２２】なお、上記においては、活性汚泥処理につ
いて説明したが、その他の場合でも、曝気空気によって
被処理液を攪拌混合し、被処理液中の気体を大気中に放
出させるなどの処理を行なっている場合は、そのような
処理に必要な空気量を供給すればよい。In the above description, the activated sludge treatment has been described, but in other cases, the liquid to be treated is agitated and mixed with aerated air so that the gas in the liquid to be treated is released into the atmosphere. If so, the amount of air required for such treatment may be supplied.
【００２３】[0023]
【発明の効果】以上のように、本発明によれば、浸漬型
膜カートリッジの下方に配置した散気装置を運転するに
際し、膜カートリッジの濾過運転時と濾過運転停止時と
において、散気装置を停止することなく曝気空気量を変
更するようにしたので、濾過運転停止時においても散気
孔の閉塞を防止できる。As described above, according to the present invention, when the air diffuser disposed below the submerged membrane cartridge is operated, the air diffuser is used during the filtration operation of the membrane cartridge and when the filtration operation is stopped. Since the amount of aeration air is changed without stopping, the clogging of the air diffuser can be prevented even when the filtration operation is stopped.
【図１】本発明の散気装置の運転方法が実施される従来
の膜分離装置の全体構成を示した説明図である。FIG. 1 is an explanatory diagram showing an overall configuration of a conventional membrane separation device in which a method for operating an air diffuser of the present invention is implemented.
【図２】図１に示した膜分離装置の一部を構成する膜カ
ートリッジを示した説明図である。FIG. 2 is an explanatory view showing a membrane cartridge that constitutes a part of the membrane separation device shown in FIG.
２ 浸漬型膜カートリッジ ４ ブロワ ５ 散気管 ５ａ 散気孔 2 Immersion type membrane cartridge 4 Blower 5 Air diffuser 5a Air diffuser
Claims (1)
ッジの下方に配置され、被処理液に曝気空気を供給する
散気装置の運転方法であって、膜カートリッジの濾過運
転時には、被処理液の処理に必要な空気量と、膜カート
リッジの膜面洗浄に必要な気液混合上昇流速度と、散気
孔の閉塞が生じない空気噴出速度とを与える量の曝気空
気を供給し、膜カートリッジの濾過運転停止時には、少
なくとも散気孔の閉塞が生じない空気噴出速度を与える
量の曝気空気を供給することを特徴とする散気装置の運
転方法。1. A method of operating an air diffuser which is disposed below an immersion type membrane cartridge for filtering a liquid to be treated and which supplies aeration air to the liquid to be treated, wherein during the filtration operation of the membrane cartridge, the liquid to be treated is treated. Aeration air is supplied in an amount that provides an amount of air necessary for treating the liquid, an ascending flow rate of gas-liquid mixture necessary for cleaning the membrane surface of the membrane cartridge, and an air ejection rate that does not cause clogging of diffuser holes. The method for operating an air diffusing apparatus, characterized in that at the time of stopping the filtering operation, the aeration air is supplied in an amount that provides an air ejection speed that does not cause clogging of air diffuser holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7274606A JPH09117647A (en) | 1995-10-24 | 1995-10-24 | Operation of air diffusion device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7274606A JPH09117647A (en) | 1995-10-24 | 1995-10-24 | Operation of air diffusion device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09117647A true JPH09117647A (en) | 1997-05-06 |
Family
ID=17544082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7274606A Pending JPH09117647A (en) | 1995-10-24 | 1995-10-24 | Operation of air diffusion device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09117647A (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6511602B1 (en) | 1997-12-05 | 2003-01-28 | Mitsubishi Rayon Co., Ltd. | Apparatus and method for treating water |
| WO2008144826A1 (en) * | 2007-05-29 | 2008-12-04 | Siemens Water Technologies Corp. | Membrane cleaning using an airlift pump |
| US8377305B2 (en) | 2004-09-15 | 2013-02-19 | Siemens Industry, Inc. | Continuously variable aeration |
| US8382981B2 (en) | 2008-07-24 | 2013-02-26 | Siemens Industry, Inc. | Frame system for membrane filtration modules |
| US8840783B2 (en) | 2007-05-29 | 2014-09-23 | Evoqua Water Technologies Llc | Water treatment membrane cleaning with pulsed airlift pump |
| US9764288B2 (en) | 2007-04-04 | 2017-09-19 | Evoqua Water Technologies Llc | Membrane module protection |
| US9764289B2 (en) | 2012-09-26 | 2017-09-19 | Evoqua Water Technologies Llc | Membrane securement device |
| US9815027B2 (en) | 2012-09-27 | 2017-11-14 | Evoqua Water Technologies Llc | Gas scouring apparatus for immersed membranes |
| US9914097B2 (en) | 2010-04-30 | 2018-03-13 | Evoqua Water Technologies Llc | Fluid flow distribution device |
| US9925499B2 (en) | 2011-09-30 | 2018-03-27 | Evoqua Water Technologies Llc | Isolation valve with seal for end cap of a filtration system |
| US9962865B2 (en) | 2012-09-26 | 2018-05-08 | Evoqua Water Technologies Llc | Membrane potting methods |
| US10322375B2 (en) | 2015-07-14 | 2019-06-18 | Evoqua Water Technologies Llc | Aeration device for filtration system |
| US10391432B2 (en) | 2011-09-30 | 2019-08-27 | Evoqua Water Technologies Llc | Manifold arrangement |
| US10427102B2 (en) | 2013-10-02 | 2019-10-01 | Evoqua Water Technologies Llc | Method and device for repairing a membrane filtration module |
-
1995
- 1995-10-24 JP JP7274606A patent/JPH09117647A/en active Pending
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6511602B1 (en) | 1997-12-05 | 2003-01-28 | Mitsubishi Rayon Co., Ltd. | Apparatus and method for treating water |
| US8377305B2 (en) | 2004-09-15 | 2013-02-19 | Siemens Industry, Inc. | Continuously variable aeration |
| US9764288B2 (en) | 2007-04-04 | 2017-09-19 | Evoqua Water Technologies Llc | Membrane module protection |
| WO2008144826A1 (en) * | 2007-05-29 | 2008-12-04 | Siemens Water Technologies Corp. | Membrane cleaning using an airlift pump |
| EP2152393A1 (en) * | 2007-05-29 | 2010-02-17 | Siemens Water Technologies Corp. | Membrane cleaning using an airlift pump |
| EP2152393A4 (en) * | 2007-05-29 | 2012-07-25 | Siemens Industry Inc | Membrane cleaning using an airlift pump |
| US8840783B2 (en) | 2007-05-29 | 2014-09-23 | Evoqua Water Technologies Llc | Water treatment membrane cleaning with pulsed airlift pump |
| US10507431B2 (en) | 2007-05-29 | 2019-12-17 | Evoqua Water Technologies Llc | Membrane cleaning with pulsed airlift pump |
| US8382981B2 (en) | 2008-07-24 | 2013-02-26 | Siemens Industry, Inc. | Frame system for membrane filtration modules |
| US9914097B2 (en) | 2010-04-30 | 2018-03-13 | Evoqua Water Technologies Llc | Fluid flow distribution device |
| US10441920B2 (en) | 2010-04-30 | 2019-10-15 | Evoqua Water Technologies Llc | Fluid flow distribution device |
| US9925499B2 (en) | 2011-09-30 | 2018-03-27 | Evoqua Water Technologies Llc | Isolation valve with seal for end cap of a filtration system |
| US10391432B2 (en) | 2011-09-30 | 2019-08-27 | Evoqua Water Technologies Llc | Manifold arrangement |
| US11065569B2 (en) | 2011-09-30 | 2021-07-20 | Rohm And Haas Electronic Materials Singapore Pte. Ltd. | Manifold arrangement |
| US9962865B2 (en) | 2012-09-26 | 2018-05-08 | Evoqua Water Technologies Llc | Membrane potting methods |
| US9764289B2 (en) | 2012-09-26 | 2017-09-19 | Evoqua Water Technologies Llc | Membrane securement device |
| US9815027B2 (en) | 2012-09-27 | 2017-11-14 | Evoqua Water Technologies Llc | Gas scouring apparatus for immersed membranes |
| US10427102B2 (en) | 2013-10-02 | 2019-10-01 | Evoqua Water Technologies Llc | Method and device for repairing a membrane filtration module |
| US11173453B2 (en) | 2013-10-02 | 2021-11-16 | Rohm And Haas Electronic Materials Singapores | Method and device for repairing a membrane filtration module |
| US10322375B2 (en) | 2015-07-14 | 2019-06-18 | Evoqua Water Technologies Llc | Aeration device for filtration system |
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