JP2500068B2 - Full aeration tank - Google Patents
Full aeration tankInfo
- Publication number
- JP2500068B2 JP2500068B2 JP3273382A JP27338291A JP2500068B2 JP 2500068 B2 JP2500068 B2 JP 2500068B2 JP 3273382 A JP3273382 A JP 3273382A JP 27338291 A JP27338291 A JP 27338291A JP 2500068 B2 JP2500068 B2 JP 2500068B2
- Authority
- JP
- Japan
- Prior art keywords
- plate
- aeration tank
- bubble diffusion
- diffusion prevention
- water surface
- 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.)
- Expired - Fee Related
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
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は下水処理場等において使
用される全面曝気槽の改良に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a full aeration tank used in a sewage treatment plant or the like.
【０００２】[0002]
【従来の技術】下水の活性汚泥処理等に使用されている
従来の全面曝気槽は、槽底部に多数の散気板を配置した
ものである。ところがこのような従来の全面曝気槽で
は、散気板から放出された気泡は浮力によって水中を急
速に上昇し、水面に達するとそのまま外気中へ逃げてし
まうため、曝気効率を評価する基準となる酸素移動効率
は平均して25％程度に過ぎないものであった。また気泡
とともに上昇した水流は槽の側壁部から槽底部に循環し
て来るが、槽内の全域に確実な対流を生じさせることが
むずかしく、部分的にデッドゾーンが生じたりして槽内
全体を有効利用しているとはいえないのが実情であっ
た。2. Description of the Related Art A conventional full aeration tank used for treating activated sludge of sewage has a large number of diffuser plates arranged at the bottom of the tank. However, in such a conventional full-scale aeration tank, the bubbles released from the diffuser plate rise rapidly in water due to buoyancy, and when they reach the water surface, they escape to the outside air as they are, which is a standard for evaluating the aeration efficiency. The oxygen transfer efficiency was only about 25% on average. Also, the water flow that rises with the bubbles circulates from the side wall of the tank to the bottom of the tank, but it is difficult to generate reliable convection in the whole area of the tank, and a dead zone is partially created, which causes the entire area of the tank. The reality is that it is not being used effectively.
【０００３】[0003]
【発明が解決しようとする課題】本発明は上記した従来
の問題点を解消して、槽内全体において汚水と気泡とを
充分に接触させることができ、また明確な循環流を槽内
全域に生じさせることができ、これによって酸素移動効
率を大幅に向上させることができる全面曝気槽を提供す
るために完成されたものである。DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art and allows sufficient contact between waste water and air bubbles in the entire tank, and a clear circulation flow in the entire tank. It has been completed to provide a full aeration tank that can be generated and thereby greatly improve the oxygen transfer efficiency.
【０００４】[0004]
【課題を解決するための手段】上記の課題を解決するた
めになされた本発明は、曝気槽の底部全面に多数の散気
板を列状に配置して、散気板の各列の上方両側に一対の
気泡拡散防止板を各列に平行に、かつその下端を前記散
気板から５〜３０ｃｍ離し、その上端を水面下２０〜５
０ｃｍに位置させて垂直に設けて、前記曝気槽の全面に
実質的に底面から水面にわたる上向流路と下降流路とを
交互に複数形成し区画するとともに、前記各一対の気泡
拡散防止板の上端から少なくとも１０ｃｍの位置と水面
との間に前記気泡拡散防止板の間隔以上の幅を備え、か
つ両庇面を下方に傾斜させた分散板を設けたことを特徴
とする。SUMMARY OF THE INVENTION The present invention, which has been made to solve the above-mentioned problems, has a plurality of diffuser plates arranged in a row on the entire bottom surface of an aeration tank, and the diffuser plates are arranged on each row above the diffuser plates. A pair of bubble diffusion prevention plates on both sides in parallel with each row and the lower end of the plate
5 to 30 cm away from the air plate, and its upper end 20 to 5 below the water surface.
Position it at 0 cm and install it vertically to cover the entire surface of the aeration tank.
There is an upward flow path and a downward flow path that extend from the bottom surface to the water surface.
A plurality of cells are alternately formed and partitioned, and a width of at least 10 cm from the upper end of each of the pair of bubble diffusion prevention plates and the width of the bubble diffusion prevention plate is provided between the water surface and the position .
It is characterized in that a dispersion plate having both eaves surfaces inclined downward is provided.
【０００５】[0005]
【実施例】以下に本発明を図示の実施例によって更に詳
細に説明する。図１は本発明の全面曝気槽の平面図、図
２はその断面図であり、１は曝気槽、２はその底部全面
に配置された多数の散気板である。これらの散気板２は
列状に配置されたもので、図面を簡単にするために４枚
ずつの散気板２を４列に配置した図が描かれている。こ
れらの散気板２にはブロアによって送気管５を通じて圧
縮空気が供給されており、槽底部から上昇する気泡を発
生させることはいうまでもない。The present invention will be described below in more detail with reference to the illustrated embodiments. FIG. 1 is a plan view of an entire aeration tank of the present invention, FIG. 2 is a sectional view thereof, 1 is an aeration tank, and 2 is a large number of diffusers arranged on the entire bottom surface thereof. These air diffusing plates 2 are arranged in rows, and in order to simplify the drawing, a drawing in which four air diffusing plates 2 are arranged in four rows is shown. Needless to say, compressed air is supplied to the air diffuser plates 2 by the blower through the air supply pipe 5, and bubbles rising from the bottom of the tank are generated.
【０００６】本発明では、これらの各列の散気板２の上
方両側にそれぞれ一対の気泡拡散防止板３を各列に平行
に垂直に設けてある。気泡拡散防止板３は平板状のもの
で、その下端は各列の散気板２よりも５〜30cm、望まし
くは10〜20cm離れた高さとする。またその上端は水面か
ら20〜50cm下方としておく。これらの気泡拡散防止板３
によって、各列の散気板２の上方に幅の狭い上向流路が
形成されることとなり、散気板２から生じた気泡は水流
とともにこの上向流路の内部を上昇して行くこととな
る。また、各列の気泡拡散防止板３の間にも幅の狭い下
降流路が形成されることとなり、上記上向の流れに対応
する水流が下降して行き、槽内全領域において循環流が
継続するのである。 According to the present invention, the diffuser plates 2 on each of these rows are
A pair of bubble diffusion prevention plates 3 on both sides of each side are parallel to each row
It is installed vertically. The bubble diffusion prevention plate 3 has a flat plate shape, and the lower end thereof is 5 to 30 cm apart from the diffuser plates 2 in each row, preferably 10 to 20 cm apart. In addition, the upper end should be 20 to 50 cm below the water surface. These bubble diffusion prevention plates 3
As a result, a narrow upward flow path is formed above the diffuser plates 2 in each row, and the bubbles generated from the diffuser plates 2 ascend inside the upward flow paths together with the water flow. Becomes In addition, the space between the bubble diffusion prevention plates 3 in each row is also narrow.
A downflow path will be formed, which will support the upward flow.
The flowing water flow goes down, and the circulating flow is
It continues.
【０００７】また、気泡拡散防止板３の上端と水面との
中間の位置に、分散板４を設けることが好ましい。分散
板４は図２に示されるような前記気泡拡散防止板の間隔
以上の幅を備え、かつ両庇面を下方に傾斜させた小型の
屋根状のものであり、気泡拡散防止板３の内部を上昇し
て来た気泡が直接水面に達することを防止するととも
に、気泡拡散防止板３の内部の上昇流を下向きに旋回さ
せる役割をも発揮するものである。気泡拡散防止板３と
分散板４との距離は少なくとも10cmとし、また分散板４
と水面との距離は10〜40cm、望ましくは20〜30cmとす
る。Further, it is preferable to provide the dispersion plate 4 at a position intermediate between the upper end of the bubble diffusion prevention plate 3 and the water surface. The dispersion plate 4 has a space between the bubble diffusion prevention plates as shown in FIG.
It is a small roof-like thing having the above width and having both eaves surfaces inclined downward, and prevents the bubbles rising inside the bubble diffusion preventing plate 3 from directly reaching the water surface. It also plays the role of swirling the upward flow inside the bubble diffusion prevention plate 3 downward. The distance between the bubble diffusion prevention plate 3 and the dispersion plate 4 should be at least 10 cm.
The distance between the water surface and the water is 10 to 40 cm, preferably 20 to 30 cm.
【０００８】[0008]
【作用】このように構成された本発明の全面曝気槽は、
曝気槽１の底部全面に設けられた多数の散気板２から水
中に気泡を噴出させて曝気を行うことは従来のものと同
様である。しかし本発明においては散気板２の列の両側
が実質的に底面から水面にわたって気泡拡散防止板３に
よって仕切られているので、散気板２から生じた気泡は
この気泡拡散防止板３の内側のみを集中して上昇する。
この間に散気板２と気泡拡散防止板３との間から巻き込
まれた水流は気泡と激しく混じり合うこととなる。The full aeration tank of the present invention thus constructed is
The aeration is performed by ejecting bubbles into the water from a large number of diffuser plates 2 provided on the entire bottom surface of the aeration tank 1 to perform aeration. However, in the present invention, both sides of the row of the air diffuser plates 2 are partitioned by the bubble diffusion prevention plate 3 substantially from the bottom surface to the water surface, so that the bubbles generated from the air diffusion plate 2 are inside the bubble diffusion prevention plate 3. Only concentrate and rise.
During this time, the water flow caught between the air diffuser plate 2 and the bubble diffusion prevention plate 3 is violently mixed with the air bubbles.
【０００９】また気泡拡散防止板３の各列内側部の流路
を図２のように上昇した気液混合流は水面付近に達した
後に気泡拡散防止板３の各列外側部の流路を下降するこ
ととなり、槽内の全域にわたって上向流路と下降流路と
が交互に複数形成されることとなる。これによって槽内
の全域にわたって確実な循環流が形成されることとな
り、槽内全体を有効に利用することが可能となり、デッ
ドゾーンが発生することがない。[0009] Each column outside the bubble diffusion preventing plate 3 after elevated gas-liquid mixed flow as shown in Fig. 2 a flow path <br/> of each column in the side portion of the bubble diffusion preventing plate 3 has reached the vicinity of the water surface will be lowered the passage of the parts, so that the over the entire area of the tank and the the upward flow path descending channel formed with a plurality alternately. Will be reliable circulation flow over the entire tank by Re This is formed, it is possible to effectively utilize the entire tank, the dead zone is not generated.
【００１０】また各列の気泡拡散防止板３の上方に分散
板４を設けることにより、上昇してきた気泡がそのまま
大気中へ抜けてしまうことが防止されて水中における気
泡の抑留量が増加する。またこの分散板４は循環流を形
成する効果もあり、これらの効果が総合された結果とし
て、酸素移動効率を従来の25％から30〜33％まで大幅に
向上させることができた。[0010] By providing the distribution plate 4 on side of the bubble diffusion preventing plate 3 of each column, internment amount of bubbles in the rises and has bubbles is directly prevented from fall out into the atmosphere in water increases . The dispersion plate 4 also has the effect of forming a circulation flow, and as a result of these effects being combined, the oxygen transfer efficiency could be greatly improved from the conventional 25% to 30 to 33%.
【００１１】[0011]
【発明の効果】以上に説明したように、本発明の全面曝
気槽は気泡拡散防止板によって槽内全域において明確な
循環流を形成し、また気泡と汚水との接触を充分に行わ
せることができるもので、これによって酸素移動効率を
従来に比較して大幅に向上させることが可能となった。
よって本発明は従来の問題点を解消した全面曝気槽とし
て、産業の発展に寄与するところは極めて大きいもので
ある。As described above, the entire aeration tank of the present invention has a clear bubble diffusion prevention plate over the entire area of the tank.
It is possible to form a circulating flow and to sufficiently bring bubbles into contact with sewage, which makes it possible to greatly improve the oxygen transfer efficiency as compared with the conventional case.
Therefore, the present invention is extremely large in that it contributes to the development of industry as a full aeration tank that solves the conventional problems.
【図１】本発明の実施例を説明する平面図である。FIG. 1 is a plan view illustrating an embodiment of the present invention.
【図２】本発明の実施例を説明する断面図である。FIG. 2 is a sectional view illustrating an embodiment of the present invention.
１ 曝気槽 ２ 散気板 ３ 気泡拡散防止板 ４ 分散板 ５ 送気管 1 Aeration tank 2 Air diffuser plate 3 Bubble diffusion prevention plate 4 Dispersion plate 5 Air pipe
Claims (1)
に配置して、散気板の各列の上方両側に一対の気泡拡散
防止板を各列に平行に、かつその下端を前記散気板から
５〜３０ｃｍ離し、その上端を水面下２０〜５０ｃｍに
位置させて垂直に設けて、前記曝気槽の全面に実質的に
底面から水面にわたる上向流路と下降流路とを交互に複
数形成し区画するとともに、前記各一対の気泡拡散防止
板の上端から少なくとも１０ｃｍの位置と水面との間に
前記気泡拡散防止板の間隔以上の幅を備え、かつ両庇面
を下方に傾斜させた分散板を設けたことを特徴とする全
面曝気槽。We claim: 1. Place a large number of diffusing air plate in rows entire bottom surface of the aeration tank, in parallel a pair of bubble diffusion preventing plate on sides opposite sides of each column of diffuser plate to each column, and that The lower end from the air diffuser
5 to 30 cm apart, with the upper end 20 to 50 cm below the water surface
Position it vertically and place it on the entire surface of the aeration tank.
Alternating upward and downward flow paths from the bottom surface to the water surface
And the space between the water surface and at least 10 cm from the upper ends of the pair of bubble diffusion prevention plates.
Both sides have a width equal to or greater than the gap between the bubble diffusion prevention plates and
A full aeration tank characterized by having a dispersion plate inclined downward .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3273382A JP2500068B2 (en) | 1991-09-24 | 1991-09-24 | Full aeration tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3273382A JP2500068B2 (en) | 1991-09-24 | 1991-09-24 | Full aeration tank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0576890A JPH0576890A (en) | 1993-03-30 |
| JP2500068B2 true JP2500068B2 (en) | 1996-05-29 |
Family
ID=17527122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3273382A Expired - Fee Related JP2500068B2 (en) | 1991-09-24 | 1991-09-24 | Full aeration tank |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2500068B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4502856B2 (en) * | 2005-03-24 | 2010-07-14 | メタウォーター株式会社 | Method for preventing clogging of air diffuser and method for operating air diffuser using this method |
| JP5551010B2 (en) * | 2010-07-26 | 2014-07-16 | メタウォーター株式会社 | Aeration system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5150746A (en) * | 1974-10-28 | 1976-05-04 | Furukawa Electric Co Ltd | Fuaibaano hifukuhoho |
| JPS583693A (en) * | 1981-06-23 | 1983-01-10 | デグレマン | Apparatus for introducing gas into liquid |
| JPH05185077A (en) * | 1992-01-16 | 1993-07-27 | Inax Corp | Diffuser and water treatment equipment provided therewith |
-
1991
- 1991-09-24 JP JP3273382A patent/JP2500068B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0576890A (en) | 1993-03-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19960112 |
|
| LAPS | Cancellation because of no payment of annual fees |