JP3784303B2 - Air diffuser - Google Patents

Air diffuser Download PDF

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Publication number
JP3784303B2
JP3784303B2 JP2001349506A JP2001349506A JP3784303B2 JP 3784303 B2 JP3784303 B2 JP 3784303B2 JP 2001349506 A JP2001349506 A JP 2001349506A JP 2001349506 A JP2001349506 A JP 2001349506A JP 3784303 B2 JP3784303 B2 JP 3784303B2
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Prior art keywords
air
diffuser
tube
air diffuser
amount
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JP2003144876A (en
Inventor
達也 上島
昌章 永野
康信 岡島
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Kubota Corp
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Kubota Corp
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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

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Description

【０００１】
【発明の属する技術分野】
本発明は散気装置に関し、反応槽内に気体を平均して散気する技術に係るものである。
【０００２】
【従来の技術】
従来、下水処理、上水処理等において反応槽内に空気等の気体を散気する散気装置は、一般的に槽内に浸漬する散気管に複数の散気孔を軸心方向に沿って適当間隔で設けており、散気管は先端を構造的に閉塞するか、バルブで閉栓しており、基端側にブロワを接続している。
【０００３】
散気装置はブロワから供給する空気を散気管の各散気孔から槽内液中に噴出させて槽内液の曝気や攪拌、酸素供給等を行うが、散気による槽内液の攪拌や酸素供給等の効果の有効性を高めるためには、散気管の各散気孔から噴出する空気量が均一であることが望ましい。
【０００４】
【発明が解決しようとする課題】
しかし、散気管が長尺である場合には、散気管の各散気孔から噴出する空気量は均一でなく、散気管は空気が流入する基端に近い程に散気孔から噴出する空気量が少なく、先端に近い程に散気孔から噴出する空気量が多くなる。
【０００５】
このため、基端に近い程に散気孔の口径を大きくしてその圧力損失を小さくし、先端に近い程に散気孔の口径を小さくしてその圧力損失を大きくすることで、各散気孔から噴出する空気量を平均化することが可能である。また、散気管に形成する散気孔の配置ピッチを基端に近い程に小さくしてその分布密度を高め、散気孔の配置ピッチを先端に近い程に大きくしてその分布密度を低めることで、噴出する空気量を散気管全体として平均化することが可能である。
【０００６】
しかし、散気孔の口径や配置ピッチを計算によって予め求めることは困難であり、散気孔の口径や配置ピッチが異なる多数の散気管を用意し、経験則として散気孔の口径や配置ピッチの最適条件を決定することは困難であり、現実的な方途ではない。
【０００７】
本発明は上記した課題を解決するものであり、散気管の各散気孔から噴出する空気量を平均化して散気による作用効果を高めることができる散気装置を提供することを目的とする。
【０００８】
【課題を解決するための手段】
上記課題を解決するために、本発明の散気装置は、槽内に浸漬する散気管に複数の散気孔を設け、散気管の基端に空気供給源を接続し、散気管を基端から先端に向けて下り勾配で傾斜配置して散気管の先端と基端との間に所定水深差を生じさせることで、散気管の各散気孔に作用する背圧を先端に近い程に漸次に高く設定したものである。
【０００９】
上記した構成において、各散気孔から噴出する空気量は散気管内の圧力と各散気孔に背圧として作用する水圧との差圧によって決まり、散気管内の圧力分布の傾向は基端側から先端側へ漸次に高くなり、この圧力分布は散気管の姿勢に影響されずほぼ一定である。このため、先端に近い程に各散気孔に作用する背圧を高くすることで、散気管内の圧力と各散気孔の背圧との差圧を一定となし、噴出する空気量を平均化する。
【００１０】
【発明の実施の形態】
以下、本発明の実施の形態を図面に基づいて説明する。図１〜図３において、曝気槽１に浸漬した散気装置２は散気ケース３の内部に散気管４を配置しており、散気管４の基端に接続した空気供給管５にブロワ６を設け、散気管４の先端に接続した洗浄用管７に洗浄用バルブ８を設けている。
【００１１】
散気管４は所定口径の大径管からなる幹管９と、幹管９の下方に配置した所定口径の小径管からなる複数の枝管１０とからなる。枝管１０は逆Ｔ字形をなし、上部の一端で幹管９に連通するとともに、両端が幹管９の下方位置で開口しており、枝管１０の上部位に複数の散気孔１１を設けている。
【００１２】
散気管４は幹管９の基端から先端に向けて下り勾配で傾斜して配置しており、散気管４の幹管９の先端と基端との間に５〜２０ｍｍの所定水深差Ｌを生じさせている。この傾斜は散気管４と散気ケース３のフレームとの間にスペーサ等を介装することで与える。この結果、曝気槽１の槽内液の水圧によって散気管４の各散気孔１１に作用する背圧は幹管９の先端に近い程に漸次に高くなる。
【００１３】
散気管４の両端の水深差の適値は散気管４の勾配を変化させて経験的に求め、後述するように、散気管４の内部圧力と各散気孔１１の背圧との差圧が一定となり、各散気孔１１から噴出する空気量が均一となる水深差とする。
【００１４】
以下、上記した構成における作用を説明する。散気運転時には洗浄用バルブ８を閉栓した状態で、ブロア６から所定圧力の空気を散気管４へ供給する。この空気は幹管９を通して各枝管１０に流れ、枝管１０の両端の開口に達する前に各散気孔１１から曝気槽１の槽内液中に噴出する。
【００１５】
各散気孔１１から噴出する空気量は散気管４の内部圧力と各散気孔１１に背圧として作用する水圧との差圧によって決まる。散気管４の内部の圧力分布の傾向は基端側から先端側へ漸次に高くなり、この圧力分布は散気管４の姿勢に影響されずほぼ一定である。
【００１６】
図６は散気管４の内部の圧力分布を測定した結果を示すものであり、散気管４を水平に配置した状態で散気管に供給する空気量を変化させた場合と、本実施の形態のように散気管４を傾斜配置した状態で散気管４に供給する空気量を変化させた場合とについて開示しており、測定位置を示す符号は幹管９の基端側から先端側へ順次に大きくなる。
【００１７】
ａ折線は散気管４が水平で０．６２５ｍ3／ｍｉｎの空気量の場合を示し、ｂ折線は散気管４が水平で０．７５ｍ3／ｍｉｎの空気量の場合を示し、ｃ折線は散気管４が水平で０．９ｍ3／ｍｉｎの空気量の場合を示し、ｄ折線は散気管４が入口側（基端側）で１０ｍｍ高くなるように傾斜して０．６２５ｍ3／ｍｉｎの空気量の場合を示し、ｅ折線は散気管４が入口側（基端側）で１０ｍｍ高くなるように傾斜して０．７５ｍ3／ｍｉｎの空気量の場合を示し、ｆ折線は散気管４が入口側（基端側）で１０ｍｍ高くなるように傾斜して０．９ｍ3／ｍｉｎの空気量の場合を示している。ａ〜ｃを求めた水位とｅ〜ｆを求めた水位とは多少異なっており、そのために水圧に差異が見られる。
【００１８】
しかし、散気管４が水平であるか傾斜しているかに拘わらず、空気量の多寡に拘わらず、圧力分布の傾向はほぼ一定であり、幹管９の先端に近い程に圧力が高くなる傾向がある。
【００１９】
一方、散気管４の各散気孔１１に作用する背圧は、散気管４を先端に向けて下り勾配に傾斜して配置し、散気管４の先端と基端との間に所定水深差を生じさせることで、先端に近い程に各散気孔１１に作用する背圧が高くなる。このため、散気管４の内部圧力と各散気孔１１の背圧との差圧が一定となり、各散気孔１１から噴出する空気量が平均化される。
【００２０】
図４は散気管４を水平に配置した状態で各枝管１０の散気孔１１における空気量を測定した結果を示すものであり、ａ折線は供給空気量が０．６２５ｍ3／ｍｉｎの場合を示し、ｂ折線は供給空気量が０．７５ｍ3／ｍｉｎの場合を示し、ｃ折線は供給空気量が０．９ｍ3／ｍｉｎの場合を示している。
【００２１】
このように、散気管４を水平に配置した場合には幹管９の先端に近い程に散気孔１１から噴出する空気量が多くなる。
図５は散気管４を入口側（基端側）で１０ｍｍ高くなるように傾斜して配置した状態で各枝管１０の散気孔１１における空気量を測定した結果を示すものであり、ａ折線は供給空気量が０．６２５ｍ3／ｍｉｎの場合を示し、ｂ折線は供給空気量が０．７５ｍ3／ｍｉｎの場合を示し、ｃ折線は供給空気量が０．９ｍ3／ｍｉｎの場合を示している。
【００２２】
このように、散気管４を先端と基端との間に所定水深差が生じるように傾斜配置した場合には、各散気孔１１から噴出する空気量が平均化される。
洗浄時には、洗浄用バルブ８を開栓し、ブロア６から散気管４の幹管９に供給する空気を洗浄用管７を通して大気圧下に排気する。
【００２３】
このとき、散気管４の幹管９の内部を流れる空気が枝管１０の散気孔１１に比べて背圧および抵抗の小さい洗浄用管７の排気口（大気圧下）へ向って流れることで、槽内液が散気孔１１を通して枝管１０および幹管９の内部に流入する。槽内液は枝管１０および幹管９の内部の付着物を洗い流し、幹管９を流れる空気とともに洗浄用管７へ流入し、エアリフト作用によって排気口から排出される。
【００２４】
圧力の低下した散気管４へ槽内液が急激に流入するとその抵抗によって内部の圧力が高まって槽内液の流入が停止し、洗浄用管７でのエアリフト作用によって散気管４の内部の槽内液を排出して散気管４の内部の圧力が低下すると槽内液が再び散気管４へ流入し、散気管４および洗浄用管７において脈動が発生する。
【００２５】
このように脈動が発生して散気管４の内部の圧力が急激な増減を繰り返して変化し、散気管４の内部に急速な槽内液の流れが反復的に生じることで散気管４の内部の付着物を洗浄する効果が高まる。
【００２６】
【発明の効果】
以上のように、本発明によれば、散気管を空気供給源に接続する基端から先端に向けて下り勾配で傾斜配置して散気管の先端と基端との間に所定水深差を生じさせ、散気管の各散気孔に作用する背圧を先端に近い程に漸次に高く設定することで、散気管内の圧力と各散気孔の背圧との差圧を一定となし、噴出する空気量を平均化することができる。
【図面の簡単な説明】
【図１】本発明の実施の形態における散気装置を示す正面図である。
【図２】同散気装置の散気管を示す横断面図である。
【図３】同散気装置の散気管を示す要部拡大図である。
【図４】散気管を水平とする状態での各散気孔における空気量を示すグラフ図である。
【図５】散気管を傾斜配置する状態での各散気孔における空気量を示すグラフ図である。
【図６】散気管の内部圧力分布を示すグラフ図である。
【符号の説明】
１ 曝気槽
２ 散気装置
３ 散気ケース
４ 散気管
５ 空気供給管
６ ブロワ
７ 洗浄用管
８ 洗浄用バルブ
９ 幹管
１０ 枝管
１１ 散気孔[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an aeration apparatus, and relates to a technique for diffusing an average gas in a reaction tank.
[0002]
[Prior art]
Conventionally, in a sewage treatment, water treatment, etc., a diffuser for diffusing a gas such as air in a reaction tank is generally suitable for a plurality of air diffusion holes along an axial direction in a diffusion pipe immersed in the tank. The air diffuser is structurally closed at the tip or closed with a valve, and a blower is connected to the base end side.
[0003]
The air diffuser blows air supplied from the blower through the air diffuser holes of the air diffuser into the liquid in the tank to aerate and agitate the liquid in the tank, supply oxygen, etc. In order to increase the effectiveness of the supply effect, it is desirable that the amount of air ejected from each air diffuser of the air diffuser is uniform.
[0004]
[Problems to be solved by the invention]
However, when the diffuser tube is long, the amount of air ejected from each diffuser hole of the diffuser tube is not uniform, and the amount of air ejected from the diffuser hole becomes closer to the proximal end where the air flows into the diffuser tube. The amount of air ejected from the air diffuser increases as the distance from the tip decreases.
[0005]
For this reason, by increasing the diameter of the diffuser hole as it is closer to the base end and reducing its pressure loss, and reducing the diameter of the diffuser hole as it is closer to the distal end and increasing its pressure loss, It is possible to average the amount of air ejected. In addition, by reducing the arrangement pitch of the diffuser holes formed in the diffuser tube as it is closer to the proximal end and increasing its distribution density, increasing the arrangement pitch of the diffuser holes closer to the tip and lowering its distribution density, It is possible to average the amount of air ejected over the entire diffuser.
[0006]
However, it is difficult to determine the aperture and arrangement pitch of the diffuser holes in advance by calculation. Prepare a number of diffuser tubes with different aperture diameters and arrangement pitches, and as a rule of thumb, the optimum conditions for the aperture and arrangement pitch of the diffuser holes It is difficult to determine and is not a realistic way.
[0007]
The present invention solves the above-described problems, and an object thereof is to provide an air diffusing device that can average the amount of air ejected from each air diffusing hole of the air diffusing pipe and enhance the effect of the air diffusing.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the air diffuser of the present invention is provided with a plurality of air diffuser holes in the air diffuser pipe immersed in the tank, an air supply source is connected to the proximal end of the air diffuser pipe, and the air diffuser pipe from the proximal end. The back pressure acting on each air diffuser in the air diffuser gradually increases toward the tip by creating a predetermined water depth difference between the tip and the base end of the air diffuser by inclining the tip toward the tip. Highly set.
[0009]
In the configuration described above, the amount of air ejected from each air diffuser is determined by the differential pressure between the pressure in the air diffuser and the water pressure acting as a back pressure on each air diffuser, and the tendency of the pressure distribution in the air diffuser from the base end side. The pressure gradually increases toward the tip, and this pressure distribution is almost constant without being influenced by the attitude of the diffuser. For this reason, by increasing the back pressure acting on each air diffuser closer to the tip, the differential pressure between the pressure in the air diffuser and the back pressure of each air diffuser is made constant, and the amount of air blown out is averaged. To do.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 3, an air diffuser 2 immersed in the aeration tank 1 has an air diffuser 4 disposed inside an air diffuser case 3, and a blower 6 is connected to an air supply pipe 5 connected to a proximal end of the air diffuser 4. The cleaning valve 8 is provided in the cleaning pipe 7 connected to the tip of the air diffusion pipe 4.
[0011]
The air diffuser 4 includes a main tube 9 made of a large-diameter tube having a predetermined diameter and a plurality of branch pipes 10 made of small-diameter tubes having a predetermined diameter arranged below the main tube 9. The branch pipe 10 has an inverted T-shape and communicates with the trunk pipe 9 at one upper end, and both ends open at positions below the trunk pipe 9, and a plurality of air diffusion holes 11 are provided in the upper part of the branch pipe 10. ing.
[0012]
The air diffuser tube 4 is disposed so as to incline with a downward slope from the proximal end of the stem tube 9 toward the distal end, and a predetermined water depth difference L of 5 to 20 mm between the distal end of the stem tube 9 and the proximal end of the diffuser tube 4. Is caused. This inclination is given by interposing a spacer or the like between the diffuser tube 4 and the frame of the diffuser case 3. As a result, the back pressure acting on each diffuser hole 11 of the diffuser tube 4 due to the water pressure of the liquid in the aeration tank 1 gradually increases toward the tip of the trunk tube 9.
[0013]
The appropriate value of the water depth difference between both ends of the air diffuser 4 is obtained empirically by changing the gradient of the air diffuser 4. As will be described later, the differential pressure between the internal pressure of the air diffuser 4 and the back pressure of each air diffuser 11 is obtained. The water depth difference is constant and the air amount ejected from each air diffuser 11 is uniform.
[0014]
Hereinafter, the operation of the above-described configuration will be described. During the aeration operation, air of a predetermined pressure is supplied from the blower 6 to the aeration tube 4 with the cleaning valve 8 closed. This air flows into each branch pipe 10 through the trunk pipe 9 and is jetted into the liquid in the aeration tank 1 from each air diffusion hole 11 before reaching the openings at both ends of the branch pipe 10.
[0015]
The amount of air ejected from each air diffuser 11 is determined by the differential pressure between the internal pressure of the air diffuser 4 and the water pressure acting as a back pressure on each air diffuser 11. The tendency of the pressure distribution inside the diffuser tube 4 gradually increases from the proximal end side to the distal end side, and this pressure distribution is almost constant regardless of the attitude of the diffuser tube 4.
[0016]
FIG. 6 shows the result of measuring the pressure distribution inside the air diffusing pipe 4, and the case where the amount of air supplied to the air diffusing pipe is changed in a state where the air diffusing pipe 4 is arranged horizontally, and the case of this embodiment. Thus, the case where the amount of air supplied to the diffuser tube 4 is changed in a state where the diffuser tube 4 is inclined is disclosed, and the reference numerals indicating the measurement positions are sequentially from the proximal end side to the distal end side of the trunk tube 9. growing.
[0017]
The a-fold line shows the case where the air diffuser 4 is horizontal and the air amount is 0.625 m 3 / min, the b-fold line shows the case where the air diffuser tube 4 is horizontal and the air amount is 0.75 m 3 / min, and the c-fold line shows the air amount The case where the trachea 4 is horizontal and the air amount is 0.9 m 3 / min is shown, and the d-fold line inclines so that the air diffuser 4 is 10 mm higher on the inlet side (base end side) and the air is 0.625 m 3 / min. The e-fold line indicates the case where the air diffuser 4 is inclined by 10 mm higher on the inlet side (base end side) and the air amount is 0.75 m 3 / min, and the f-fold line indicates the air diffuser 4 This shows a case where the air amount is 0.9 m 3 / min inclined to be 10 mm higher on the inlet side (base end side). The water levels obtained from a to c are slightly different from the water levels obtained from ef, and therefore, the water pressure is different.
[0018]
However, regardless of whether the air diffuser 4 is horizontal or inclined, the tendency of the pressure distribution is almost constant regardless of the amount of air, and the pressure tends to be higher as the tip of the main tube 9 is closer. There is.
[0019]
On the other hand, the back pressure acting on each air diffuser 11 of the air diffuser 4 is arranged so as to incline downward with the air diffuser 4 facing the tip, and a predetermined water depth difference is provided between the tip and the base end of the air diffuser 4. By making it generate, the back pressure acting on each air diffuser 11 becomes higher as it is closer to the tip. For this reason, the differential pressure between the internal pressure of the air diffuser 4 and the back pressure of each air diffuser 11 becomes constant, and the amount of air ejected from each air diffuser 11 is averaged.
[0020]
FIG. 4 shows the result of measuring the amount of air in the air diffuser hole 11 of each branch pipe 10 with the air diffuser 4 arranged horizontally. The a broken line shows the case where the amount of supplied air is 0.625 m 3 / min. The b-fold line indicates the case where the supply air amount is 0.75 m 3 / min, and the c-fold line indicates the case where the supply air amount is 0.9 m 3 / min.
[0021]
Thus, when the diffuser tube 4 is horizontally disposed, the amount of air ejected from the diffuser holes 11 increases as the distance from the tip of the trunk tube 9 increases.
FIG. 5 shows the result of measuring the amount of air in the air diffuser hole 11 of each branch pipe 10 in a state where the air diffuser pipe 4 is inclined to be 10 mm higher on the inlet side (base end side). Indicates the case where the supply air amount is 0.625 m 3 / min, the b-fold line indicates the case where the supply air amount is 0.75 m 3 / min, and the c-fold line indicates the case where the supply air amount is 0.9 m 3 / min. Show.
[0022]
In this way, when the air diffuser 4 is inclined so that a predetermined water depth difference is generated between the distal end and the proximal end, the amount of air ejected from each diffuser hole 11 is averaged.
At the time of cleaning, the cleaning valve 8 is opened, and the air supplied from the blower 6 to the trunk tube 9 of the diffuser tube 4 is exhausted through the cleaning tube 7 to atmospheric pressure.
[0023]
At this time, the air flowing inside the trunk tube 9 of the diffuser tube 4 flows toward the exhaust port (under atmospheric pressure) of the cleaning tube 7 having a lower back pressure and resistance than the diffuser holes 11 of the branch tube 10. The liquid in the tank flows into the branch pipe 10 and the trunk pipe 9 through the air diffusion holes 11. The liquid in the tank flushes the deposits inside the branch pipe 10 and the trunk pipe 9, flows into the washing pipe 7 together with the air flowing through the trunk pipe 9, and is discharged from the exhaust port by the air lift action.
[0024]
When the liquid in the tank suddenly flows into the diffuser pipe 4 where the pressure has dropped, the internal pressure increases due to the resistance, and the inflow of the liquid in the tank stops, and the tank inside the diffuser pipe 4 by the air lift action in the cleaning pipe 7 When the internal liquid is discharged and the pressure inside the diffuser tube 4 decreases, the liquid in the tank flows into the diffuser tube 4 again, and pulsation occurs in the diffuser tube 4 and the cleaning tube 7.
[0025]
In this way, pulsation is generated and the pressure inside the diffusing tube 4 is changed by repeated rapid increase and decrease, and a rapid flow of liquid in the tank is repeatedly generated inside the diffusing tube 4, whereby the inside of the diffusing tube 4. The effect of cleaning the adhering material is increased.
[0026]
【The invention's effect】
As described above, according to the present invention, the diffuser pipe is inclined at a downward gradient from the proximal end to the distal end connected to the air supply source, and a predetermined water depth difference is generated between the distal end and the proximal end of the diffuser pipe. By setting the back pressure acting on each air diffuser of the air diffuser gradually higher as it approaches the tip, the differential pressure between the pressure in the air diffuser and the back pressure of each air diffuser is made constant, and the air is ejected. The amount of air can be averaged.
[Brief description of the drawings]
FIG. 1 is a front view showing an air diffuser according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing an air diffuser of the air diffuser.
FIG. 3 is an enlarged view of a main part showing an air diffuser of the air diffuser.
FIG. 4 is a graph showing the amount of air in each air diffuser when the air diffuser is horizontal.
FIG. 5 is a graph showing the amount of air in each air diffuser in a state where the air diffuser is inclined.
FIG. 6 is a graph showing the internal pressure distribution of the air diffuser.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Aeration tank 2 Air diffuser 3 Air diffuser case 4 Air diffuser pipe 5 Air supply pipe 6 Blower 7 Washing pipe 8 Washing valve 9 Stem pipe 10 Branch pipe 11 Aeration hole

Claims (1)

槽内に浸漬する散気管に複数の散気孔を設け、散気管の基端に空気供給源を接続し、散気管を基端から先端に向けて下り勾配で傾斜配置して散気管の先端と基端との間に所定水深差を生じさせることで、散気管の各散気孔に作用する背圧を先端に近い程に漸次に高く設定したことを特徴とする散気装置。A plurality of diffuser holes are provided in the diffuser tube immersed in the tank, an air supply source is connected to the proximal end of the diffuser tube, and the diffuser tube is inclined downwardly from the proximal end to the distal end to dispose the distal end of the diffuser tube. An air diffuser characterized in that the back pressure acting on each air diffuser of the air diffuser is gradually set higher as it approaches the distal end by causing a predetermined water depth difference between the proximal end and the proximal end.
JP2001349506A 2001-11-15 2001-11-15 Air diffuser Expired - Fee Related JP3784303B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001349506A JP3784303B2 (en) 2001-11-15 2001-11-15 Air diffuser

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001349506A JP3784303B2 (en) 2001-11-15 2001-11-15 Air diffuser

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JP2003144876A JP2003144876A (en) 2003-05-20
JP3784303B2 true JP3784303B2 (en) 2006-06-07

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Publication number Priority date Publication date Assignee Title
JP5532819B2 (en) * 2009-10-28 2014-06-25 三菱レイヨン株式会社 Operation method of air diffuser
EP2913310A4 (en) 2012-10-25 2015-11-11 Mitsubishi Rayon Co Aeration device, operation method therefor, and water treatment apparatus
JP6308062B2 (en) * 2013-09-26 2018-04-11 三菱ケミカル株式会社 Air diffuser and water treatment device
CN107935209B (en) * 2017-10-26 2024-01-19 上海市政工程设计研究总院（集团）有限公司 Aeration partial pressure control method

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