JPH08132034A - Discharge method of scum - Google Patents
Discharge method of scumInfo
- Publication number
- JPH08132034A JPH08132034A JP30293494A JP30293494A JPH08132034A JP H08132034 A JPH08132034 A JP H08132034A JP 30293494 A JP30293494 A JP 30293494A JP 30293494 A JP30293494 A JP 30293494A JP H08132034 A JPH08132034 A JP H08132034A
- Authority
- JP
- Japan
- Prior art keywords
- scum
- tank
- water surface
- float type
- feed well
- 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
Landscapes
- Removal Of Floating Material (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は円形または矩形の水面を
有し、かつ中央部にフィードウェルを設けた沈澱槽の水
面に浮遊するスカムを効率的に槽水面の前面にわたって
排出するようにしたスカムの排出方法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention efficiently discharges scum floating on the water surface of a settling tank having a circular or rectangular water surface and having a feed well at the center thereof over the front surface of the water surface of the tank. It relates to a method for discharging scum.
【０００２】[0002]
【従来の技術】下水の処理工程において、下水中に曝気
を行って好気性処理をする際、処理槽の水面に発泡スカ
ムが多量に発生し浮遊する。この発泡スカムは土壌細菌
（放線菌）が曝気にて異常増殖し、曝気槽内で発泡スカ
ム化するものである。この発泡スカムは最終沈澱池水面
上に浮上して、見栄えを悪くすると共に、処理水と共に
越流して水質を悪化させる等の問題がある。この対策と
して処理槽内にスカムスキマーを設置してこの水面に浮
遊するスカムを排除する方法がある。従来、この種のス
カムの排出装置としてフロート式スカムスキマーが汎用
されている。このスカムスキマーは通常の曝気運転の時
間帯はスカム排出のため装置を停止し、水面に許容以上
のスカムが水面に浮遊することを検知若しくは観察して
予め定めた時間に或いは任意の時間帯にスカム排出のた
めにスカムスキマを駆動し、この水面に浮遊するスカム
を排出するようにしている。2. Description of the Related Art In the process of treating sewage, when aerating the sewage to perform aerobic treatment, a large amount of foam scum is generated and floats on the water surface of the treatment tank. This foamed scum is that soil bacteria (actinomycetes) aerate and abnormally proliferate, and become foamed scum in the aeration tank. This foamed scum floats above the surface of the final settling basin to make it look unattractive and overflow with the treated water to deteriorate the water quality. As a countermeasure, there is a method of installing a scum skimmer in the treatment tank to eliminate the scum floating on the water surface. Conventionally, a float type scum skimmer has been widely used as a scum discharging device of this type. This scum skimmer stops the device for scum discharge during normal aeration operation time, detects or observes that scum floating above the water level exceeds the allowable level, and at a predetermined time or at any time. The scum skimmer is driven to discharge the scum, and the scum floating on the water surface is discharged.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、このス
カムスキマーは通常処理槽の予め定めた一箇所にのみ設
置している。このためスカムスキマー近辺の水面に滞留
する薄膜状のスカムは排出されるが、スカムスキマーか
ら離れたスカムスキマーの吸込力が及ばない水面や、フ
ィードウェルの裏側水面に存在するスカム及び粒隗状の
スカムは排出されることがない。また、スカムスキマを
断続的に運転してスカムを排出する場合に、スカムスキ
マーによる吸込力が及ばない水面に浮遊するスカムは排
出されずに水面にスカムが滞留し、これが順次成長し、
さらにはスカム発生量が多いときに沈澱槽上部の水面が
スカムで覆われてしまう欠点があった。However, this scum skimmer is usually installed only at one predetermined location in the processing tank. Therefore, the thin film-like scum staying on the surface of the water near the scum skimmer is discharged, but the surface of the water that the suction force of the scum skimmer away from the scum skimmer does not reach and the scum and particle-like particles present on the water surface on the back side of the feedwell. Scum is never discharged. Also, when the scum skimmer is operated intermittently to discharge the scum, the scum floating on the water surface that the suction force by the scum skimmer does not reach is not discharged and the scum stays on the water surface and grows sequentially.
Furthermore, there is a drawback that the water surface above the settling tank is covered with scum when the amount of scum generated is large.
【０００４】本発明は円形または矩形の水面を有し、か
つその中央部にフィードウェルを設けた沈澱槽におい
て、水面に浮遊するスカムの排出をより効率的にし、沈
澱槽の水面全面におけるスカムの滞留成長を抑制するス
カムの排出方法を提供することを目的とする。The present invention makes it possible to more efficiently discharge scum floating on the water surface in a sedimentation tank having a circular or rectangular water surface and a feed well provided at the center thereof, and to eliminate scum on the entire water surface of the sedimentation tank. An object of the present invention is to provide a scum discharging method for suppressing stagnant growth.
【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、円形または矩形の水面を有
し、中央部にフィードウェルを有する沈澱槽において、
このフィードウェルを中心としてその放射方向に複数台
設けたフロート式スカムスキマーを、順次或いは同時に
運転することによりフロート式スカムスキマーの近辺の
槽水面に浮遊するスカムを収集し、槽水面全面にわたっ
て浮遊するスカムを確実に槽外に排出することを要旨と
する。The present invention has been made in order to achieve the above-mentioned object, and in a settling tank having a circular or rectangular water surface and a feed well in the center,
A plurality of float type scum skimmers provided in the radial direction around this feed well are operated sequentially or simultaneously to collect scum floating on the surface of the tank near the float type scum skimmer, and float over the entire surface of the tank. The point is to ensure that the scum is discharged outside the tank.
【０００６】[0006]
【作 用】円形または矩形の水面を有する沈澱槽におい
て、その中央部にフィードウェルを設けると共に、複数
台のフロート式スカムスキマーを沈澱槽中央部のフィー
ドウェルの対角位置に設置し、スカム排出のためこの複
数台のフロート式スカムスキマーを順次もしくは同時に
運転することにより、沈澱槽水面全面に存在する薄膜状
のスカムを水面に滞留することなく確実に沈澱槽より排
出させ、スカムの成長を防止し、水処理性能を全く損な
わずに沈澱槽の全水面からスカムを効率的に排出するこ
とができる。[Operation] In a settling tank with a circular or rectangular water surface, a feed well is provided at the center of the settling tank, and multiple float-type scum skimmers are installed at diagonal positions of the feed well in the center of the settling tank. Therefore, by operating these multiple float type scum skimmers sequentially or simultaneously, the thin film-like scum existing on the entire surface of the sedimentation tank can be reliably discharged from the sedimentation tank without staying on the water surface, and the growth of scum can be prevented. However, scum can be efficiently discharged from the entire water surface of the precipitation tank without impairing the water treatment performance.
【０００７】[0007]
【実施例】以下本発明のスカム排出方法を図面に示す実
施例にもとづいて説明する。図において、１は円形もし
くは矩形の水面を有する沈澱槽で、この沈澱槽１の中央
部に流入管２を直結したフィードウェル３を配設し、か
つ沈澱槽１の外周部に添って処理水越流堰４を設ける。
この沈澱槽１は図示の実施例では円形を示すが、水面は
円形に限定されるものではなく、矩形とすることも可能
である。DESCRIPTION OF THE PREFERRED EMBODIMENTS The scum discharging method of the present invention will be described below with reference to the embodiments shown in the drawings. In the figure, 1 is a settling tank having a circular or rectangular water surface, a feed well 3 having an inflow pipe 2 directly connected to the center of the settling tank 1, and a treated water overflow along the outer periphery of the settling tank 1. A weir 4 is provided.
The settling tank 1 has a circular shape in the illustrated embodiment, but the water surface is not limited to a circular shape and may be a rectangular shape.
【０００８】この沈澱槽１にはフロート式スカムスキマ
ー５をフィードウェル３に対し対角位置に２台設置して
いるが、フィードウェル３を中央にしてその放射方向に
３台以上設置してもよい。フロート式スカムスキマー５
はフロート部５ａ及びスカム排出管部５ｂよりなり、こ
のスカム排出管部５ｂ内に空気配管６ａを直接もしくは
継手を介して連結してエアリフトポンプ６を設ける。こ
のエアリフトポンプ６はスカム排出の駆動装置として用
いるが、このスカム排出は他の方法にて行うことがで
き、このエアリフトポンプに限定されるものではない。In this settling tank 1, two float type scum skimmers 5 are installed at diagonal positions with respect to the feed wells 3, but even if three or more float type scum skimmers 5 are installed in the radial direction with the feed wells 3 as the center. Good. Float type scum skimmer 5
Comprises a float portion 5a and a scum discharge pipe portion 5b, and an air lift pump 6 is provided by connecting an air pipe 6a directly or via a joint in the scum discharge pipe portion 5b. Although this air lift pump 6 is used as a drive device for scum discharge, this scum discharge can be performed by another method and is not limited to this air lift pump.
【０００９】またフロート式スカムスキマー５のスカム
排出管部５ｂの上部に直接もしくは継手を介してスカム
排出管７を連結したマス８を連結する。Further, a mass 8 to which a scum discharge pipe 7 is connected is connected to an upper portion of the scum discharge pipe portion 5b of the float type scum skimmer 5 directly or through a joint.
【００１０】次に上述のように構成される本発明の沈澱
槽における動作及び作用を説明する。沈澱槽１のスカム
排出管部５ｂ内に設けたエアリフトポンプ６に空気配管
６ａより給気してエアリフトポンプ６を駆動すると、ス
カム排出管部５ｂ内の水が、この管内を上昇し、上部の
マス８を通りスカム排出管７より排出されると共に、こ
れに伴いスカム排出管内は負圧となり、水面にあるフロ
ート式スカムスキマー５のフロート部５ａより沈澱槽１
の水面のフロート式スカムスキマー５近辺に浮遊してい
る薄膜状のスカムが水とともに吸引され、これが継続的
に行われて同上の経路により順次系外へ排出される。Next, the operation and action of the settling tank of the present invention constructed as described above will be described. When the air lift pump 6 is driven by supplying air to the air lift pump 6 provided in the scum discharge pipe part 5b of the settling tank 1 from the air pipe 6a, the water in the scum discharge pipe part 5b rises in this pipe, While being discharged from the scum discharge pipe 7 through the mass 8, the inside of the scum discharge pipe becomes negative pressure, and from the float portion 5a of the float type scum skimmer 5 on the water surface, the precipitation tank 1
The thin film-like scum floating around the water surface of the float type scum skimmer 5 is sucked together with water, and this is continuously performed, and the scum is sequentially discharged out of the system through the same route.
【００１１】そしてフィードウェル３に対し対角位置に
複数台設置しているフロート式スカムスキマー５を順次
運転することにより、沈澱槽１の水面に、しかもスカム
スキマー近辺に浮遊している薄膜状のスカムが水ととも
に吸引され、沈澱槽１系外に排出される。このようにし
て沈澱槽１水面全面における浮遊スカムの滞留成長が抑
制可能となる。またフロート式スカムスキマー５を同時
に運転することによって浮遊スカムを短時間に排出する
ことができ、より効率的にスカムの排出が可能となり、
沈澱槽１水面の全面におけるスカムの滞留及び成長を防
止することができる。A plurality of float type scum skimmers 5 installed diagonally to the feed well 3 are sequentially operated to form a thin film floating on the water surface of the settling tank 1 and near the scum skimmer. The scum is sucked together with water and discharged out of the settling tank 1 system. In this way, it becomes possible to suppress the staying growth of floating scum on the entire surface of the settling tank 1. In addition, by operating the float type scum skimmer 5 at the same time, the floating scum can be discharged in a short time, and the scum can be discharged more efficiently.
The accumulation and growth of scum on the entire surface of the settling tank 1 can be prevented.
【００１２】なお図１、図２ではこのフロート式スカム
スキマー２台の設置実施例を示したもので、この構成に
限定されるものではなく、設置台数や水面の障害物の状
況により各種の設置位置を採用することができるもので
ある。FIGS. 1 and 2 show an example of installation of the two float type scum skimmers, and the present invention is not limited to this configuration, and various installations may be performed depending on the number of installations and the condition of obstacles on the water surface. The position can be adopted.
【００１３】[0013]
【発明の効果】本発明のスカムの排出方法によれば、中
央部にフィードウェルを有する沈澱槽において、このフ
ィードウェルを中心としてその放射方向に複数台設けた
各フロート式スカムスキマーを、順次運転することによ
りフロート式スカムスキマーの近辺の槽水面に浮遊する
スカムを順次収集し、槽外に排出するようにしているの
で、沈澱槽水面に存在する薄膜状のスカムはフロート式
スカムスキマーの近辺の水面から順次収集され沈澱槽よ
り排出され、沈澱槽内に滞留することがなく、さらにス
カムの成長を防止し沈澱槽水面からのスカムの排出効率
を高めることができる。また、沈澱槽の中央部に設置し
たフィードウェルを中心として、その放射方向に複数台
設けたフロート式スカムスキマーを、同時に運転するこ
とによりフロート式スカムスキマーの近辺の槽水面に浮
遊するスカムを同時に収集し、槽外に排出させることが
できるので、水面でのスカムの滞留成長を防止して効率
的なスカムの排出が行える利点がある。According to the scum discharging method of the present invention, in a settling tank having a feed well in the central portion, a plurality of float type scum skimmers provided in the radial direction around the feed well are sequentially operated. By doing so, the scum floating on the water surface of the float type scum skimmer near the float type scum skimmer is sequentially collected and discharged to the outside of the tank. Sequentially collected from the surface of the water and discharged from the settling tank, they do not stay in the settling tank, and further, the growth of scum can be prevented and the efficiency of discharging scum from the surface of the settling tank can be increased. In addition, centering on the feed well installed in the center of the settling tank, multiple float type scum skimmers installed in the radial direction are operated at the same time, so that the scum floating on the surface of the tank near the float type scum skimmer simultaneously. Since it can be collected and discharged to the outside of the tank, there is an advantage that the accumulation and growth of scum on the water surface can be prevented and the scum can be discharged efficiently.
【図１】本発明の一実施例を示すフロート式スカムスキ
マーを設置した沈澱槽全体の断面図である。FIG. 1 is a sectional view of the entire settling tank in which a float type scum skimmer is installed according to an embodiment of the present invention.
【図２】同沈澱槽全体の平面図である。FIG. 2 is a plan view of the entire precipitation tank.
１ 沈澱槽 ２ 流入管 ３ フィードウェル ４ 越流堰 ５ フロート式スカムスキマー ５ａ フロート部 ５ｂ スカム排出管 ６ エアリフトポンプ ６ａ 空気配管 ７ スカム排出管 ８ マス 1 settling tank 2 inflow pipe 3 feedwell 4 overflow weir 5 float type scum skimmer 5a float part 5b scum discharge pipe 6 air lift pump 6a air pipe 7 scum discharge pipe 8 mass
Claims (2)
において、このフィードウェルを中心としてその放射方
向に複数台設けたフロート式スカムスキマーを、順次運
転することによりフロート式スカムスキマーの近辺の槽
水面に浮遊するスカムを順次収集し、これにより槽水面
の前面にわたって浮遊するスカムを確実に槽外に排出す
ることを特徴とするスカムの排出方法。1. In a settling tank having a feed well in the central portion, a plurality of float type scum skimmers provided in the radial direction around the feed well are sequentially operated to sequentially operate the water surface near the float type scum skimmer. A method for discharging scum, characterized by sequentially collecting scum floating in the tank, and reliably discharging scum floating over the front of the water surface of the tank to the outside of the tank.
において、このフィードウェルを中心としてその放射方
向に複数台設けたフロート式スカムスキマーを、同時に
運転することによりフロート式スカムスキマーの近辺の
槽水面に浮遊するスカムを同時に収集し、槽水面全面に
わたる浮遊スカムを槽外に排出することを特徴とするス
カムの排出方法。2. In a settling tank having a feed well in the central portion, a plurality of float type scum skimmers provided in the radial direction centering on the feed well are simultaneously operated so that the tank surface near the float type scum skimmer A method for discharging scum, characterized in that scum floating in the tank is collected at the same time and the floating scum over the entire surface of the tank is discharged to the outside of the tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30293494A JPH08132034A (en) | 1994-11-11 | 1994-11-11 | Discharge method of scum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30293494A JPH08132034A (en) | 1994-11-11 | 1994-11-11 | Discharge method of scum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08132034A true JPH08132034A (en) | 1996-05-28 |
Family
ID=17914896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30293494A Pending JPH08132034A (en) | 1994-11-11 | 1994-11-11 | Discharge method of scum |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08132034A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7258788B2 (en) | 2004-03-12 | 2007-08-21 | Noram Engineering And Constructors Ltd. | Circular clarifier apparatus and method |
| JP2007253134A (en) * | 2006-03-27 | 2007-10-04 | Suido Kiko Kaisha Ltd | Sedimentation tank |
-
1994
- 1994-11-11 JP JP30293494A patent/JPH08132034A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7258788B2 (en) | 2004-03-12 | 2007-08-21 | Noram Engineering And Constructors Ltd. | Circular clarifier apparatus and method |
| US7985341B2 (en) | 2004-03-12 | 2011-07-26 | Noram Engineering and Construction Ltd. | Circular clarifier apparatus and method |
| JP2007253134A (en) * | 2006-03-27 | 2007-10-04 | Suido Kiko Kaisha Ltd | Sedimentation tank |
| JP4718353B2 (en) * | 2006-03-27 | 2011-07-06 | 水道機工株式会社 | Sedimentation tank |
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