JP4094712B2 - Backflow preventer for mechanical aeration equipment in oxidation ditch. - Google Patents

Backflow preventer for mechanical aeration equipment in oxidation ditch. Download PDF

Info

Publication number
JP4094712B2
JP4094712B2 JP36231097A JP36231097A JP4094712B2 JP 4094712 B2 JP4094712 B2 JP 4094712B2 JP 36231097 A JP36231097 A JP 36231097A JP 36231097 A JP36231097 A JP 36231097A JP 4094712 B2 JP4094712 B2 JP 4094712B2
Authority
JP
Japan
Prior art keywords
oxidation ditch
flow
prevention plate
backflow prevention
impeller
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
Application number
JP36231097A
Other languages
Japanese (ja)
Other versions
JPH11169883A (en
Inventor
雅之 多田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Heavy Industries Environment Co Ltd
Original Assignee
Sumitomo Heavy Industries Environment Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sumitomo Heavy Industries Environment Co Ltd filed Critical Sumitomo Heavy Industries Environment Co Ltd
Priority to JP36231097A priority Critical patent/JP4094712B2/en
Publication of JPH11169883A publication Critical patent/JPH11169883A/en
Application granted granted Critical
Publication of JP4094712B2 publication Critical patent/JP4094712B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

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】
【産業上の利用分野】
本発明は、下水処理施設に関し、特にオキシデーションディッチにおける機械式ばっ気装置の逆流防止器に関する。
【０００２】
【従来の技術】
図３および、図４は下水をオキシデーションディッチ法により処理する公知のオキシデーションディッチであって、長楕円槽１の中央部分に長手方向に沿って隔壁２が設置され、前記槽１の端部に隔壁２に近接して縦型エアレータ３が設置されており、エアレータの回転運動により槽１内に流入された被処理水を槽壁と隔壁で形成される水路を還流させながら曝気処理を行い、浄化された水は槽１に設けた越流堰４から沈殿槽へと排出される下水処理設備である。
【０００３】
上記設備において縦型エアレータ３を運転させると、図４〜図６に示すように、エアレータ３のインペラ５の下方から被処理水を吸い込み、インペラ中央部上方からインペラ外側へ放射状に押出流として押し出している。したがって、この押出流がインペラ５の入口付近では循環流に対して図６に示すように逆向きとなり、循環能力の低下をきたし、また、浮遊物（スカム等）をせき止めて槽内に滞留させて被処理水の浄化能力の低下をきたすという問題点があった。
【０００４】
【発明が解決しようとする課題】
本発明は上記の問題点を改良し、スカム等を槽内に滞留させることなくばっ気装置の循環性能を向上させ、ひいては被処理水の浄化性能の向上を図ることを目的とするものである。
【０００５】
【課題を解決するための手段】
オキシデーションディッチにおける隔壁２の縦型エアレータ３側端部の上方で、前記縦型エアレータ３のインペラ５からの押出流が槽１内の循環流に対向する箇所に逆流防止板６を設置し、さらに、前記隔壁２の下部で、前記縦型エアレータ３のインペラ５への吸込流が槽１内の循環流に対向する箇所に逆流防止板６’を設置したことを特徴とする。
【０００６】
【発明の実施の形態】
本発明装置の実施の形態について図１および図２により説明する。図１は本発明にかかる逆流防止器を隔壁２の先端部に設置した状態の斜視図である。図２はその平面図である。６はインペラ５からの押出流（実線矢印）に対する逆流防止板であって、逆流防止板の形状は図示のものは断面がへ字状に取付け部７から屈曲して平板としているが湾曲板でもよい。８、８、・・は整流板で逆流防止板６と一体構造でも別体構造のいずれでもよい。
【０００７】
上記構造の逆流防止板６をインペラ５の押出流が槽１内の循環流と逆向きとなる水面付近に位置するように、隔壁２の先端部上方位置へ該逆流防止板６の取付け部７をボルト９等により取付けている。なお、図示していないが逆流防止板６とその取付け部７とを蝶板等により連結すれば逆流防止板６の角度を最適の角度に変更選定できる。
６’はインペラ５への吸込流（点線矢印）に対する逆流防止板で前記押出流に対する逆流防止板６と同様に取付け部７’整流板８’、８’・・を有する構造からなっており、吸込流に対する逆流防止板６’をインペラ５への吸込流が循環流と逆向きとなる水中下方部に位置するように隔壁２の先端部下方位置へ該逆流防止板６’の取付け部７’をボルト９’等により設置することにより被処理水の循環機能を向上できる。
【０００８】
本発明はインペラ５からの押出流に対する逆流防止板６を押出流が槽１内の循環流と逆向きとなる水面付近に位置するように（逆流防止板の上縁が水面から露出し、該防止板の下縁が水深の浅い深さに位置するように）設置しているので、図２に示すようにインペラ５からの押出流のうちで循環流と対向する一部の流れは逆流防止板６に遮られて循環流に逆らわないように方向変換される。したがって、循環流がインペラ入口近傍で流れを低下させたりスカムを滞留させることがない。
【０００９】
【発明の効果】
本発明はインペラ５からの押出流に対する逆流防止板６を押出流が槽１内の循環流と逆向きとなる水面付近に位置するように設置したことにより循環流がインペラ入口近傍で流れを低下させたりスカムを滞留させることがない。また、インペラ５からの吸込流に対する逆流防止板６’を吸込流が循環流と逆向きとなる水中下方部に位置するように設置することにより被処理水の循環機能を一層向上できる。
【図面の簡単な説明】
【図１】本発明に係る逆流防止器の１実施態様の斜視図。
【図２】本発明に係る逆流防止器の１実施態様の平面図。
【図３】従来からのオキシデーションディッチの説明図。
【図４】従来からのオキシデーションディッチの一部切欠斜視説明図。
【図５】インペラ運転時の水深方向における水流の説明図。
【図６】従来装置におけるインペラ運転時の水流の説明図。
【符号の説明】
１ 長楕円槽
２ 隔壁
３ 縦型エアレータ
４ 越流堰
５ インペラ
６ 押出流に対する逆流防止板
６’ 吸込流に対する逆流防止板
７ 取付け部
７’ 取付け部
８ 整流板
８’ 整流板
９ 取付けボルト
９’ 取付けボルト[0001]
[Industrial application fields]
The present invention relates to a sewage treatment facility, and more particularly to a backflow preventer for a mechanical aeration apparatus in an oxidation ditch.
[0002]
[Prior art]
3 and 4 are known oxidation ditches for treating sewage by the oxidation ditch method, and a partition wall 2 is installed along the longitudinal direction at the center of the elliptical tank 1, and the end of the tank 1 is shown. A vertical aerator 3 is installed in the vicinity of the partition wall 2, and aeration treatment is performed while refluxing the water to be treated which has flowed into the tank 1 by the rotational movement of the aerator through the water channel formed by the tank wall and the partition wall. The purified water is sewage treatment equipment that is discharged from the overflow weir 4 provided in the tank 1 to the settling tank.
[0003]
When the vertical aerator 3 is operated in the above equipment, as shown in FIGS. 4 to 6, the water to be treated is sucked from the lower side of the impeller 5 of the aerator 3 and extruded from the upper part of the impeller radially outward to the outer side of the impeller. ing. Therefore, the extrusion flow is opposite to the circulation flow in the vicinity of the inlet of the impeller 5 as shown in FIG. 6, causing a reduction in the circulation capacity, and suspending suspended matters (such as scum) to stay in the tank. Therefore, there is a problem that the purification capacity of the treated water is lowered.
[0004]
[Problems to be solved by the invention]
An object of the present invention is to improve the above problems and to improve the circulation performance of the aeration apparatus without causing scum or the like to stay in the tank, and thus to improve the purification performance of the water to be treated. .
[0005]
[Means for Solving the Problems]
A backflow prevention plate 6 is installed above the end of the partition 2 in the oxidation ditch on the side of the vertical aerator 3 where the extruded flow from the impeller 5 of the vertical aerator 3 faces the circulating flow in the tank 1, Furthermore, a backflow prevention plate 6 ′ is installed at a position where the suction flow into the impeller 5 of the vertical aerator 3 is opposed to the circulating flow in the tank 1 below the partition wall 2.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the apparatus of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing a state in which a backflow preventer according to the present invention is installed at the tip of a partition wall 2. FIG. 2 is a plan view thereof. 6 is a backflow prevention plate for the extrusion flow (solid arrow) from the impeller 5, and the shape of the backflow prevention plate shown in the figure is a flat plate with a cross section bent from the mounting portion 7, but it is also a curved plate. Good. 8, 8,... Are rectifying plates that may be integrated with the backflow prevention plate 6 or may be separate structures.
[0007]
The backflow prevention plate 6 having the above-described structure is attached to the upper portion of the front end of the partition wall 2 so that the extrusion flow of the impeller 5 is located in the vicinity of the water surface opposite to the circulation flow in the tank 1. Are attached with bolts 9 or the like. Although not shown, if the backflow prevention plate 6 and its mounting portion 7 are connected by a butterfly plate or the like, the angle of the backflow prevention plate 6 can be changed to an optimum angle.
6 ′ is a backflow prevention plate for the suction flow (dotted arrow) to the impeller 5 and has a structure having mounting portions 7 ′ flow straightening plates 8 ′, 8 ′,. The backflow prevention plate 6 'for the suction flow is positioned below the tip of the partition wall 2 so that the suction flow into the impeller 5 is opposite to the circulation flow. Can be improved by circulating the water to be treated.
[0008]
In the present invention, the backflow prevention plate 6 against the extrusion flow from the impeller 5 is positioned near the water surface where the extrusion flow is opposite to the circulation flow in the tank 1 (the upper edge of the backflow prevention plate is exposed from the water surface, Since the lower edge of the prevention plate is located at a shallow depth), a part of the extrusion flow from the impeller 5 facing the circulation flow is prevented from backflow as shown in FIG. The direction is changed so as not to be opposed to the circulating flow by being blocked by the plate 6. Therefore, the circulating flow does not lower the flow near the impeller inlet or cause the scum to stay.
[0009]
【The invention's effect】
In the present invention, the backflow prevention plate 6 for the extruding flow from the impeller 5 is installed so that the extruding flow is located near the water surface in the direction opposite to the circulating flow in the tank 1, so that the circulating flow decreases near the impeller inlet. No scum or retention. Further, by installing the backflow prevention plate 6 'for the suction flow from the impeller 5 so as to be positioned in the lower part of the water where the suction flow is opposite to the circulation flow, the circulation function of the water to be treated can be further improved.
[Brief description of the drawings]
FIG. 1 is a perspective view of one embodiment of a backflow preventer according to the present invention.
FIG. 2 is a plan view of one embodiment of a backflow preventer according to the present invention.
FIG. 3 is an explanatory diagram of a conventional oxidation ditch.
FIG. 4 is a partially cutaway perspective explanatory view of a conventional oxidation ditch.
FIG. 5 is an explanatory diagram of a water flow in a water depth direction during impeller operation.
FIG. 6 is an explanatory diagram of a water flow during impeller operation in a conventional apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Elliptical tank 2 Bulkhead 3 Vertical aerator 4 Overflow weir 5 Impeller 6 Backflow prevention plate 6 'with respect to extrusion flow Backflow prevention plate 7 with respect to suction flow Mounting portion 7' Mounting portion 8 Rectification plate 8 'Rectification plate 9 Mounting bolt 9' Mounting bolt

Claims (5)

オキシデーションディッチにおける隔壁（２）の縦型エアレータ（３）側端部の上方で、前記縦型エアレータ（３）のインペラ（５）からの押出流が槽（１）内の循環流に対向する箇所に、上縁が水面から露出するように逆流防止板（６）を設置するとともに、オキシデーションディッチにおける隔壁（２）の縦型エアレータ（３）側端部の下方で、前記縦型エアレータ（３）のインペラ（５）への吸込流が槽（１）内の循環流に対向する箇所に逆流防止板（６’）を設置したことを特徴とするオキシデーションディッチにおける機械式ばっ気装置の逆流防止器。The extrusion flow from the impeller (5) of the vertical aerator (3) opposes the circulation flow in the tank (1) above the end of the vertical aerator (3) side of the partition wall (2) in the oxidation ditch. At the location, a backflow prevention plate (6) is installed so that the upper edge is exposed from the water surface, and the vertical aerator (under the vertical aerator (3) side end of the partition wall (2) in the oxidation ditch The mechanical aeration apparatus in the oxidation ditch is characterized in that a backflow prevention plate (6 ′) is installed at a location where the suction flow into the impeller (5) of 3) faces the circulating flow in the tank (1). Backflow preventer. オキシデーションディッチにおける隔壁（２）の縦型エアレータ（３）側端部の上方で、前記縦型エアレータ（３）のインペラ（５）からの押出流が槽（１）内の循環流に対向する箇所に逆流防止板（６）を設置するとともに、オキシデーションディッチにおける隔壁（２）の縦型エアレータ（３）側端部の下方で、前記縦型エアレータ（３）のインペラ（５）への吸込流が槽（１）内の循環流に対向する箇所に逆流防止板（６’）を設置したことを特徴とするオキシデーションディッチにおける機械式ばっ気装置の逆流防止器。The extrusion flow from the impeller (5) of the vertical aerator (3) opposes the circulating flow in the tank (1) above the end of the vertical aerator (3) side of the partition wall (2) in the oxidation ditch. The backflow prevention plate (6) is installed at the location, and the vertical aerator (3) side end of the partition wall (2) in the oxidation ditch is sucked into the impeller (5) of the vertical aerator (3) A backflow preventer for a mechanical aeration device in an oxidation ditch, characterized in that a backflow prevention plate (6 ') is installed at a location where the flow faces the circulating flow in the tank (1). 逆流防止板は平板または湾曲板で構成されていることを特徴とする請求項１または２のいずれかに記載のオキシデーションディッチにおける機械式ばっ気装置の逆流防止器。 3. The backflow preventer for a mechanical aeration apparatus in an oxidation ditch according to claim 1, wherein the backflow prevention plate is formed of a flat plate or a curved plate. 逆流防止板は、取付け部に対して角度が可変であることを特徴とする請求項１乃至３のいずれかに記載のオキシデーションディッチにおける機械式ばっ気装置の逆流防止器。The backflow preventer for a mechanical aeration apparatus in an oxidation ditch according to any one of claims 1 to 3, wherein the backflow prevention plate is variable in angle with respect to the mounting portion. 逆流防止板には整流板が一体または別体に付設されていることを特徴とする請求項１乃至４のいずれかに記載のオキシデーションディッチにおける機械式ばっ気装置の逆流防止器。5. A backflow preventer for a mechanical aeration apparatus in an oxidation ditch according to any one of claims 1 to 4, wherein the backflow prevention plate is provided with a baffle plate integrally or separately.
JP36231097A 1997-12-12 1997-12-12 Backflow preventer for mechanical aeration equipment in oxidation ditch. Expired - Fee Related JP4094712B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP36231097A JP4094712B2 (en) 1997-12-12 1997-12-12 Backflow preventer for mechanical aeration equipment in oxidation ditch.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP36231097A JP4094712B2 (en) 1997-12-12 1997-12-12 Backflow preventer for mechanical aeration equipment in oxidation ditch.

Publications (2)

Publication Number Publication Date
JPH11169883A JPH11169883A (en) 1999-06-29
JP4094712B2 true JP4094712B2 (en) 2008-06-04

Family

ID=18476526

Family Applications (1)

Application Number Title Priority Date Filing Date
JP36231097A Expired - Fee Related JP4094712B2 (en) 1997-12-12 1997-12-12 Backflow preventer for mechanical aeration equipment in oxidation ditch.

Country Status (1)

Country Link
JP (1) JP4094712B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5591751B2 (en) * 2011-03-31 2014-09-17 住友重機械エンバイロメント株式会社 Oxidation ditch and method of repairing oxidation ditch
JP5989555B2 (en) * 2013-01-25 2016-09-07 住友重機械エンバイロメント株式会社 Aeration stirrer and oxidation ditch
CN113072174B (en) * 2021-02-25 2022-09-13 镇江伊博特环保科技有限公司 Anti-backflow perforation aerator

Also Published As

Publication number Publication date
JPH11169883A (en) 1999-06-29

Similar Documents

Publication Publication Date Title
US4446018A (en) Waste treatment system having integral intrachannel clarifier
JP4094712B2 (en) Backflow preventer for mechanical aeration equipment in oxidation ditch.
KR100441860B1 (en) High-speed settling pond using slope plate
JP2004122075A (en) Water treatment apparatus
US4455239A (en) Clarification of fluids
JP4257024B2 (en) Nitrification carrier circulation method in deep tank aeration tank
JPS6136475B2 (en)
JP4358369B2 (en) Structure of water discharge pit
KR200229510Y1 (en) An apparatus for removing the sludeg in a setting pond
JP3298807B2 (en) Method and apparatus for preventing excessive outflow of aerated liquid from overflow weir of oxidation ditch tank
JP2813335B2 (en) Drainage method of drainage in drainage collecting pipe
KR200355219Y1 (en) High-speed settling pond using slope plate
JP3568241B2 (en) How to install an aerator in the oxidation ditch
JP2521173Y2 (en) Scum removal device
JPS5917438Y2 (en) Sewage septic tank
JP3908365B2 (en) Aerator for oxidation ditch
JPS5837513Y2 (en) water treatment equipment
KR100323218B1 (en) Air-lift pump
JPH0118232Y2 (en)
JPH0614872Y2 (en) Settling tank with scum capture zone
JPH02169099A (en) Water purifying device
JPS5823440Y2 (en) Sewage purification equipment
JP2521633Y2 (en) Scum removal device for batch type activated sludge treatment tank
JP3345876B2 (en) Suction device for circulation pumps, etc.
JPH0580582U (en) Scum removal device for batch type activated sludge treatment tank

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20040416

RD02 Notification of acceptance of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7422

Effective date: 20050801

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20050901

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20070206

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20070406

A711 Notification of change in applicant

Free format text: JAPANESE INTERMEDIATE CODE: A712

Effective date: 20070628

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20070703

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20070830

RD02 Notification of acceptance of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7422

Effective date: 20070914

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A821

Effective date: 20070918

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20080304

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20080306

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110314

Year of fee payment: 3

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110314

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120314

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130314

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130314

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140314

Year of fee payment: 6

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

LAPS Cancellation because of no payment of annual fees