JP2936027B2 - Aeration method - Google Patents
Aeration methodInfo
- Publication number
- JP2936027B2 JP2936027B2 JP3359852A JP35985291A JP2936027B2 JP 2936027 B2 JP2936027 B2 JP 2936027B2 JP 3359852 A JP3359852 A JP 3359852A JP 35985291 A JP35985291 A JP 35985291A JP 2936027 B2 JP2936027 B2 JP 2936027B2
- Authority
- JP
- Japan
- Prior art keywords
- tank
- aeration
- flow
- aerator
- cylindrical body
- 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)
- Mixers Of The Rotary Stirring Type (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は１０数ｍ以上の深槽にお
いても均一に、かつ所要量の空気、または酸素を供給
し、効率的に曝気を行う方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for supplying a required amount of air or oxygen uniformly and efficiently aerating even in a deep tank of more than 10 meters.
【０００２】[0002]
【従来の技術】汚水処理において、汚水中の有機物を分
解処理する方法として槽内に空気を供給し、汚水を撹拌
する曝気方法がある。従来汚水に、しかも槽底部まで撹
拌し、曝気するものとして特公昭５５−２９７５６号公
報に開示されたものがある。これは槽内に円筒体を配設
し、この円筒体内にスクリューを設け、これにより円筒
体内の汚水に空気を吹き込みつつ、下向流を発生させ、
槽底に達した後、円筒体の外周部を上向流として槽内を
循環させる方法である。2. Description of the Related Art In the treatment of sewage, there is an aeration method in which air is supplied into a tank and the sewage is stirred as a method for decomposing organic substances in the sewage. Conventionally, there is a method disclosed in Japanese Patent Publication No. 55-29756, in which sewage is further stirred and aerated to the bottom of the tank. This arranges a cylindrical body in a tank, provides a screw in this cylindrical body, thereby blowing down air into the sewage in the cylindrical body, while generating a downward flow,
After reaching the tank bottom, the outer periphery of the cylindrical body is circulated in the tank as an upward flow.
【０００３】[0003]
【発明が解決しようとする課題】槽内に設置した円筒体
内に撹拌機または曝気機にて下向流を発生させて、円筒
体内の汚水を曝気しつつ、槽底まで流下させる場合、１
０ｍ程度の槽では槽内全体に循環流が発生し、所要の撹
拌と曝気が行える。しかし、汚水の下向流中に曝気する
場合、円筒体内にはこの撹拌機による下向流中の気泡が
円筒体内をその浮力にて上昇し初め、これが上向流とな
り、水流及び気泡が槽底部に到達しない。これは気泡に
よるエアリフト力により一般に、その発生上向流は約
０．３ｍ／秒となっている。従って１０ｍ以上の深槽に
おいてはこのエアリフト力による上向流により下向水
流、及び気泡が槽底部にまで達せず、槽内の均一撹拌及
び曝気ができなかった。また散気泡式やブロア併用の水
中撹拌機においては、１０ｍ以上の深槽では高い送気圧
力が必要で、ブロアの容量が大きく、ランニングコスト
が高く、保守点検や故障時の作業が難しい等の欠点があ
る。When a downward flow is generated by a stirrer or an aerator in a cylindrical body installed in a tank, and the effluent in the cylindrical body is aerated while flowing down to the bottom of the tank,
In a tank of about 0 m, a circulating flow is generated in the entire tank, and required stirring and aeration can be performed. However, when aeration is performed in the downward flow of sewage, bubbles in the downward flow caused by the stirrer in the cylinder begin to rise in the cylinder due to its buoyancy. Does not reach the bottom. This is generally due to the air lift force of the bubbles, and the generated upward flow is generally about 0.3 m / sec. Therefore, in a deep tank of 10 m or more, the downward water flow and bubbles did not reach the bottom of the tank due to the upward flow due to the air lift force, and uniform stirring and aeration in the tank could not be performed. In addition, in the case of a submerged stirrer that uses a diffused bubble or a blower, a high air pressure is required in a deep tank of 10 m or more, the capacity of the blower is large, the running cost is high, and it is difficult to perform maintenance work and trouble-shooting. There are drawbacks.
【０００４】本発明では汚水の撹拌・曝気を制御するこ
とにより１０ｍ以上の深槽においても槽内循環流を発生
させ、所望の撹拌曝気を槽底部を含めて均一に行うこと
を目的とする。An object of the present invention is to control the stirring and aeration of sewage to generate a circulating flow in a tank even in a deep tank of 10 m or more, and to uniformly perform desired stirring and aeration including the bottom of the tank.
【０００５】[0005]
【課題を解決するための手段】本発明は上記目的を達成
するためになしたもので、所要の深さを有する曝気槽内
にほぼ垂直方向に下向流を発生するように、かつ下向流
が槽底に達する撹拌下向流を発生せしめる曝気機を備
え、運転開始初期に槽内において上下の曝気用気泡によ
るエアリフト力以上の循環水流速を得るまで嫌気運転と
し、その後、曝気運転に切り換え、深槽においても槽内
全体を均一に曝気するようになしたことを要旨とする。SUMMARY OF THE INVENTION The present invention has been made to achieve the above-described object, and generates a downward flow in a vertical direction in an aeration tank having a required depth and in a downward direction. It is equipped with an aerator that generates a stirring downward flow in which the flow reaches the bottom of the tank.In the initial stage of operation, anaerobic operation is performed until a circulating water flow rate that is equal to or higher than the air lift force of the upper and lower aeration bubbles is obtained in the tank. The point is that the entire inside of the tank is uniformly aerated even in the switching and the deep tank.
【０００６】[0006]
【作用】深槽における曝気運転の開始初期は嫌気運転と
して気泡によるエアリフト作用が発生しないように撹拌
し、円筒体内に下向流を発生させる。そして円筒体内外
において槽内に循環流が生じ、少なくとも円筒体内の下
向流速が気泡によるエアリフト力に打ち勝つ下向粒に達
した時、曝気運転に切り換える。これにより槽内には均
一の循環流が生じ気泡によるエアリフト力以上の下向流
で、気泡は確実に円筒体内を流下して槽底に達し、円筒
体外周部ではエアリフト力が作用し、槽内の循環流を促
進でき、槽底部の汚水も充分に曝気できる。At the beginning of the aeration operation in the deep tank, an aerobic operation is performed as an anaerobic operation to agitate so as not to cause an air lift effect by air bubbles to generate a downward flow in the cylindrical body. Then, when a circulating flow is generated inside and outside the cylinder and inside the tank, and at least when the downward flow velocity in the cylinder reaches the downward grain that overcomes the air lift force due to bubbles, the operation is switched to the aeration operation. As a result, a uniform circulating flow is generated in the tank, and the bubbles flow down the cylindrical body to the bottom of the tank without fail due to the downward flow of the air lift force caused by the bubbles. The circulation flow in the tank can be promoted, and the wastewater at the bottom of the tank can be sufficiently aerated.
【０００７】[0007]
【実施例】以下本発明曝気方法を図示の実施例に基づい
て説明する。図において１は所要の容積、及び１０ｍ以
上の深さを有する曝気槽で、この曝気槽１内に、撹拌機
または自吸式曝気機の撹拌にて槽内全体の汚水に、槽上
部と槽底部間にて循環水流を生じるよう、図１に示すよ
うに円筒体２、または図２に示すように隔壁板３を上下
方向に配設する。この円筒体２、又は隔壁板３は下向流
が槽底に達し、かつ槽底部で転回して上向流となるよう
にして、円筒体２又は隔壁板３の上下部において槽内の
水が互いに流通なるようにその長さは適当に定められ
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The aeration method of the present invention will be described below with reference to the illustrated embodiment. In the figure, reference numeral 1 denotes an aeration tank having a required volume and a depth of 10 m or more. In the aeration tank 1, the wastewater in the entire tank is stirred by a stirrer or a self-priming aerator, and the top of the tank and the tank. The cylindrical body 2 as shown in FIG. 1 or the partition plate 3 as shown in FIG. 2 is disposed in the vertical direction so as to generate a circulating water flow between the bottoms. The cylindrical body 2 or the partition plate 3 allows the downward flow to reach the bottom of the tank and turns at the bottom of the tank to form an upward flow. Are appropriately determined so that they can pass through each other.
【０００８】円筒体２、または隔壁板３にて仕切られ、
かつ槽内で下向流を発生する区画室内に汚水の下向流を
発生させる撹拌機もしくは曝気機４を設置する。そして
撹拌機の場合、給気管（図示せず）を介してスクリュー
の先端より空気を吐出し、微細気泡として汚水中に混合
させるようになす。また図示のように自吸式の曝気機４
を用いる場合、モータ４１の駆動により中空軸４２の先
端に設けたスクリュー４３が回動する時、このスクリュ
ー先端水域で発生する負圧にて、中空軸４２の上端より
大気中の空気または酸素を吸気し、スクリュー下端位置
にて水中に放気する。そしてこの中空軸４２の上端に制
御弁４４を設置し、この制御弁４４の操作にて吸気量を
調整し、曝気を制御する。[0008] Partitioned by a cylindrical body 2 or a partition plate 3,
In addition, a stirrer or an aerator 4 for generating a downward flow of the sewage is installed in a compartment which generates a downward flow in the tank. In the case of a stirrer, air is discharged from the tip of the screw via an air supply pipe (not shown) and mixed as fine bubbles into wastewater. Also, as shown in FIG.
When the screw 43 provided at the tip of the hollow shaft 42 is rotated by the driving of the motor 41, the air or oxygen in the atmosphere is removed from the upper end of the hollow shaft 42 by the negative pressure generated in the screw tip water area. Inhales and discharges into water at the screw lower end position. Then, a control valve 44 is installed at the upper end of the hollow shaft 42, and the amount of intake air is adjusted by operating the control valve 44 to control aeration.
【０００９】上述のように構成する装置において、曝気
機を運転して所要の汚水を曝気処理する場合、この曝気
機４の運転開始初期は空気量を規制する制御弁４４を閉
じる。これにより曝気機の運転によりスクリュー４３に
て円筒体内の汚水は撹拌され、かつスクリューピッチの
方向と回転数とにより下方向への流れ、いわゆる下向流
が発生し、円筒体２の下端まで達した下向流は槽底１ａ
に沿って円筒体の外周で槽内を上向きに流れて上向流と
なり、次いで槽上部に達した流れは水面下にある円筒体
２の上端より吸引される。このようにして汚水は槽内
で、かつ円筒体の内外を経て上下方向の循環流が発生す
る。In the apparatus constructed as described above, when operating the aerator to aerate the required sewage, the control valve 44 for regulating the amount of air is closed at the beginning of the operation of the aerator 4. By the operation of the aerator, the sewage in the cylindrical body is agitated by the screw 43 and flows downward according to the direction of the screw pitch and the number of rotations, so-called downward flow, and reaches the lower end of the cylindrical body 2. The downward flow is the tank bottom 1a
Flows upward in the tank at the outer periphery of the cylindrical body along the path, and becomes an upward flow. Then, the flow reaching the upper part of the tank is sucked from the upper end of the cylindrical body 2 below the water surface. In this way, the sewage generates a vertical circulating flow inside the tank and inside and outside the cylindrical body.
【００１０】この循環流が少なくとも同筒内で、吸気に
よる気泡のエアリフト力０．３ｍ／秒に打ち勝つ流速、
例えば１〜２ｍ／秒に達した時、制御弁４４を開弁する
と、スクリュー４３による汚水の撹拌にて発生している
スクリュー先端水域の負圧により制御弁４４より中空軸
４２内を経て前記水域内へ空気または酸素を微細気泡と
して供給され、汚水と撹拌され、円筒体内の下向流にて
槽底部まで移送され、気泡も槽内循環流と共に周回し、
所要の曝気が行われる。A flow velocity at which this circulating flow overcomes the air lift force of air bubbles of 0.3 m / sec at least in the same cylinder,
For example, when the speed reaches 1 to 2 m / sec, when the control valve 44 is opened, the negative pressure of the screw tip water area generated by the agitation of the sewage by the screw 43 causes the control valve 44 to pass through the hollow shaft 42 to the water area. Air or oxygen is supplied as fine bubbles into the inside, stirred with sewage, transferred to the bottom of the tank in a downward flow in the cylinder, the bubbles also circulate with the circulation flow in the tank,
The required aeration is performed.
【００１１】このように槽内に曝気用の気泡によるエア
リフト力に対し、充分打ち勝つ循環水流が発生した時点
で曝気運転に切り換えるので、槽底部の汚水を含む１０
ｍ以上の深さを有する槽全体にわたって均一な曝気が行
えるものとなる。As described above, the operation is switched to the aeration operation when the circulating water flow that sufficiently overcomes the air lift force generated by the air bubbles for aeration in the tank.
Thus, uniform aeration can be performed over the entire tank having a depth of at least m.
【００１２】なお、上記実施例は図１に示す円筒体２を
用いたもので説明したが、図２の隔壁板３を用いた実施
例においても同様の作用を有する。Although the above embodiment has been described using the cylindrical body 2 shown in FIG. 1, the embodiment using the partition plate 3 shown in FIG. 2 has the same effect.
【００１３】また運転開始初期において槽内全体の循環
水流を発生させる場合、曝気機４のモータ４１をインバ
ータ等にて制御して行うこともできる。これは運転開始
初期にモータ４１を曝気運転時の設定回転数よりも高速
運転させることにより行える。When a circulating water flow is generated in the entire tank in the initial stage of the operation, the motor 41 of the aerator 4 can be controlled by an inverter or the like. This can be achieved by operating the motor 41 at a higher speed than the set rotation speed during the aeration operation at the beginning of the operation.
【００１４】[0014]
【発明の効果】本発明曝気方法は深い曝気槽内に槽底部
と上部間に循環水流が発生するようにして設けた曝気機
を運転開始初期において嫌気運転を行い、曝気による気
泡のエアリフト力以上の循環水流速を得た後、曝気運転
に切り換えるようになしているため、深い槽においても
槽底部に循環水流と共に気泡が達し、これにより槽全体
において汚水の撹拌と曝気が均一に行える利点がある。The aeration method of the present invention performs an anaerobic operation in the early stage of operation of an aerator provided in a deep aeration tank so as to generate a circulating water flow between the bottom and the top of the tank, and the airlift force of bubbles by the aeration is increased. After switching to the aeration operation after obtaining the circulating water flow velocity, bubbles reach the bottom of the tank together with the circulating water flow even in a deep tank, which has the advantage that the agitation and aeration of the wastewater can be performed uniformly in the entire tank. is there.
【図１】本発明曝気方法を実施する第一実施例の説明図
である。FIG. 1 is an explanatory view of a first embodiment for implementing an aeration method of the present invention.
【図２】同第二実施例の説明図である。FIG. 2 is an explanatory diagram of the second embodiment.
【符号の説明】 １ 曝気槽 ２ 円筒体 ３ 隔壁板 ４ 曝気機 ４１ モータ ４２ 中空軸 ４３ スクリュー ４４ 制御弁[Description of Signs] 1 Aeration tank 2 Cylindrical body 3 Partition wall 4 Aerator 41 Motor 42 Hollow shaft 43 Screw 44 Control valve
Claims (1)
方向に下向流を発生するように、かつ下向流が槽底に達
する撹拌下向流とともに酸素を供給せしめる曝気機を備
え、運転開始初期には当該曝気機の攪拌機能のみ又は別
の攪拌機を用いて嫌気運転を行ない助走攪拌し、上下の
曝気用気泡によるエアリフト力以上の循環水流速を発生
させ、その後、曝気運転に切り換え、深槽においても槽
内全体を均一に曝気するようになしたことを特徴とする
曝気方法。An aerator is provided for generating a downward flow in a vertical direction in an aeration tank having a required depth and supplying oxygen together with a stirring downward flow in which the downward flow reaches the bottom of the tank. In the initial stage of the operation, the anaerobic operation is performed using only the stirring function of the aerator or another stirrer, and the turbulent flow is performed.The circulating water flow rate is higher than the air lift force by the upper and lower aeration bubbles. Aeration method characterized in that the entire inside of the tank is uniformly aerated even in the switching and deep tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3359852A JP2936027B2 (en) | 1991-12-26 | 1991-12-26 | Aeration method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3359852A JP2936027B2 (en) | 1991-12-26 | 1991-12-26 | Aeration method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05177194A JPH05177194A (en) | 1993-07-20 |
| JP2936027B2 true JP2936027B2 (en) | 1999-08-23 |
Family
ID=18466633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3359852A Expired - Fee Related JP2936027B2 (en) | 1991-12-26 | 1991-12-26 | Aeration method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2936027B2 (en) |
-
1991
- 1991-12-26 JP JP3359852A patent/JP2936027B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05177194A (en) | 1993-07-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100806474B1 (en) | The Mixers and the Submersible Aerators with using these mixers | |
| JP2574653B2 (en) | Device for selectively performing aeration or anaerobic liquid stirring | |
| US6557835B2 (en) | Apparatus for mixing and aerating liquid-solid slurries | |
| US6460830B1 (en) | Device for stirring and aerating a liquid and eliminating foam in a tank for treating said liquid | |
| JP3385047B2 (en) | Water purification equipment | |
| JP2936027B2 (en) | Aeration method | |
| JP2966993B2 (en) | Aeration apparatus and operation method thereof | |
| JP2606690B2 (en) | Vertical loop type reaction tank with air release delay characteristics | |
| US4285818A (en) | Process of treating wastewater with oxygen | |
| KR20030071099A (en) | Submersible Aerator with the Function of Air Priming, Intermittent Aeration, Deoderization and Mixing | |
| JPH05245494A (en) | Aeration method | |
| CN109368772A (en) | Recycle current flow fixed bed aerobic biofilter | |
| US4324655A (en) | Apparatus for treating wastewater with oxygen | |
| JPH05192681A (en) | Method and device for aeration | |
| JPH07108295A (en) | Pressurized aeration treatment device for waste water | |
| JP2003024973A (en) | Membrane separation type oxidation ditch | |
| JPH05177193A (en) | Aeration method and device therefor | |
| KR890003923B1 (en) | Method for purification of foul dirt by aeration and apparatus therefor | |
| HU188312B (en) | Mixing aerating device | |
| JPH05228490A (en) | Method for aeration and apparatus therefor | |
| JPH05177192A (en) | Aeration method and device therefor | |
| JPS6340597B2 (en) | ||
| JPH05245495A (en) | Aeration device | |
| JPH05253593A (en) | Aerator | |
| JP2966994B2 (en) | Aeration method and device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313111 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| LAPS | Cancellation because of no payment of annual fees |