JP4470486B2 - Sedimentation tank - Google Patents

Sedimentation tank Download PDF

Info

Publication number
JP4470486B2
JP4470486B2 JP2003432751A JP2003432751A JP4470486B2 JP 4470486 B2 JP4470486 B2 JP 4470486B2 JP 2003432751 A JP2003432751 A JP 2003432751A JP 2003432751 A JP2003432751 A JP 2003432751A JP 4470486 B2 JP4470486 B2 JP 4470486B2
Authority
JP
Japan
Prior art keywords
tank
tank body
sedimentation
peripheral wall
wall 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
Application number
JP2003432751A
Other languages
Japanese (ja)
Other versions
JP2005185995A (en
Inventor
ラジブ ゴエル
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.)
Kurita Water Industries Ltd
Original Assignee
Kurita Water Industries 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 Kurita Water Industries Ltd filed Critical Kurita Water Industries Ltd
Priority to JP2003432751A priority Critical patent/JP4470486B2/en
Priority to TW093138547A priority patent/TWI262816B/en
Priority to KR1020067012335A priority patent/KR101170572B1/en
Priority to CNB2004800390933A priority patent/CN100404098C/en
Priority to PCT/JP2004/019062 priority patent/WO2005063355A1/en
Publication of JP2005185995A publication Critical patent/JP2005185995A/en
Application granted granted Critical
Publication of JP4470486B2 publication Critical patent/JP4470486B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/2444—Discharge mechanisms for the classified liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/02—Settling tanks with single outlets for the separated liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
    • B01D21/0069—Making of contact surfaces, structural details, materials therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/02—Settling tanks with single outlets for the separated liquid
    • B01D21/04—Settling tanks with single outlets for the separated liquid with moving scrapers
    • B01D21/06—Settling tanks with single outlets for the separated liquid with moving scrapers with rotating scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/2405—Feed mechanisms for settling tanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/2427—The feed or discharge opening located at a distant position from the side walls

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
  • Biological Treatment Of Waste Water (AREA)

Description

本発明は、原水を沈降分離処理するための沈殿槽（沈降分離装置）に係り、特に槽体の中央部に供給された原水の少なくとも一部が槽体の内周壁面に沿って上昇して清澄水となり、この清澄水が溢流部から流出するよう構成された沈殿槽に関する。   The present invention relates to a sedimentation tank (sedimentation separation device) for subjecting raw water to sedimentation separation, and in particular, at least part of the raw water supplied to the central part of the tank body rises along the inner peripheral wall surface of the tank body. The present invention relates to a sedimentation tank configured to be clarified water, and the clarified water is configured to flow out from the overflow portion.

沈降分離装置には、自然沈降分離装置、傾斜沈降分離装置、凝集沈殿分離装置などがある（水処理管理便覧，丸善株式会社，平成１０年９月３０日発行，第１３０頁表２・１２参照）。同書第１３１頁２・３・３の通り、自然沈降分離装置には、長方形と円形とがあり、長方形は通常水平流で横流式沈殿池とよばれ、円形沈降装置は上向流と水平流式とがあり、清澄を目的とした場合には水平流式が採用されている。   Sedimentation separators include natural sedimentation separators, inclined sedimentation separators, and coagulation sedimentation separators (see Water Treatment Management Handbook, Maruzen Co., Ltd., issued on September 30, 1998, page 130, Tables 2 and 12). ). There are two types of natural sedimentation separation devices, rectangular and circular, as described on page 131, 2, 3 of the same book. The rectangles are usually called horizontal flow sedimentation basins with horizontal flow, and circular sedimentation devices have upward flow and horizontal flow. For the purpose of clarification, the horizontal flow method is adopted.

横流式沈殿池は、密度流が発生しやすく、流入、流出整流壁や中間整流壁を設けて流れを均一化して分離効率の向上を図っている。円形沈降装置は、沈降スラッジの集泥が容易である。円形沈殿槽の構造例（同書第１３１頁図２・２２）を第４図に示す。この円形沈殿槽にあっては、槽体１の中央に設けられたセンターウェル２に原水供給管３を介して供給された原水が、該センターウェル２の下部から槽体１の下部に広がり、次いで槽体１内を上昇してこの間に固形分が沈降分離され、清澄水が溢流堰４を溢流して槽体外に流出する。沈降した汚泥は、駆動装置５によって回転駆動される集泥用レーキ６によって排泥部７に集められ、排出管８を介して排出される。   The cross-flow type sedimentation basin tends to generate a density flow, and an inflow / outflow rectifying wall and an intermediate rectifying wall are provided to make the flow uniform and improve separation efficiency. The circular sedimentation device is easy to collect sedimentation sludge. FIG. 4 shows an example of the structure of a circular sedimentation tank (the same page, page 131, FIGS. 2 and 22). In this circular sedimentation tank, the raw water supplied to the center well 2 provided in the center of the tank body 1 through the raw water supply pipe 3 spreads from the lower part of the center well 2 to the lower part of the tank body 1, Subsequently, the inside of the tank body 1 is raised and the solid content is settled and separated during this time, and the clear water overflows the overflow weir 4 and flows out of the tank body. The settled sludge is collected by the mud collecting rake 6 that is rotationally driven by the driving device 5, and is discharged through the discharge pipe 8.

傾斜沈降分離装置は、沈降槽内に傾斜板や水平板を挿入したものであり、板の下面に清澄液が生成し、挿入面積分だけ沈降面積が多くなり、清澄液の生長速度が速くなるという原理を用いている。したがって、板の挿入面積に比例して分離面積を大きくすることができ、水面積負荷（ｍ３／ｍ２ｈ）を小さくできるので、沈降速度の小さい粒子の分離が可能となる。 The inclined sedimentation separator is a device in which an inclined plate or a horizontal plate is inserted into the sedimentation tank, and a clarified liquid is generated on the lower surface of the plate, the sedimentation area increases by the insertion area, and the growth speed of the clarified liquid increases. Is used. Therefore, it is possible to increase the separation area in proportion to the insertion area of the plate, since water area load (m 3 / m 2 h) can be reduced, thereby achieving the separation of small particles of sedimentation velocity.

この傾斜板を備えた沈殿槽は、実公平５−４５３６３号公報、特開平５−２００２０５号公報等に記載されている。
水処理管理便覧，丸善株式会社，平成１０年９月３０日発行 実公平５−４５３６３号公報 特開平５−２００２０５号公報 The sedimentation tank provided with this inclined plate is described in Japanese Utility Model Publication No. 5-45363, Japanese Patent Laid-Open No. 5-200205, and the like.
Handbook of water treatment management, Maruzen Co., Ltd., issued on September 30, 1998 Japanese Utility Model Publication No. 5-45363 Japanese Patent Laid-Open No. 5-200205

上記実公平５−４５３６３号公報、特開平５−２００２０５号公報の沈殿槽にあっては、傾斜板を広い範囲にわたって設置しており、コスト高である。   In the settling tanks disclosed in the above Japanese Utility Model Publication Nos. 5-45363 and 5-200205, the inclined plates are installed over a wide range, which is expensive.

本発明は、比較的簡易な構成でありながら固形分の沈降分離特性に優れた沈殿槽を提供することを目的とする。   An object of the present invention is to provide a sedimentation tank having a relatively simple structure and excellent solids sedimentation characteristics.

本発明の沈殿槽は、円形の槽体の中央部に供給された原水の少なくとも一部が、該槽体の内周壁面に沿って上昇し、該槽体上部の溢流部から清澄水となって流出する沈殿槽において、該槽体の内周壁面に沿って傾斜板を設けており、該傾斜板の該内周壁面から該槽体の中央側に延出する横幅は、該槽体の半径の１０〜３０％であることを特徴とするものである。 In the sedimentation tank of the present invention, at least a part of the raw water supplied to the central part of the circular tank body rises along the inner peripheral wall surface of the tank body, and clear water and In the settling tank that flows out, an inclined plate is provided along the inner peripheral wall surface of the tank body, and the lateral width extending from the inner peripheral wall surface of the inclined plate to the center side of the tank body is the tank body. It is characterized by being 10 to 30% of the radius .

本発明の沈殿槽にあっては、槽体中央部に供給された原水の多くは、槽体底部に沿って槽体内周壁面に向って流れ、次いで該内周壁面に沿って上昇し、この間に固形分の沈降分離処理がなされ、清澄水が槽体上部の溢流部を溢流する。   In the settling tank of the present invention, most of the raw water supplied to the center of the tank flows along the bottom of the tank toward the peripheral wall of the tank, and then rises along the inner peripheral wall. The solids are settled and separated, and the clear water overflows the overflow part at the upper part of the tank body.

本発明では、この槽体内周壁面に傾斜板を設けているので、この槽体内周壁面に沿って水が上昇する間に効率よく沈降分離処理される。本発明では、傾斜板は槽体内周壁面に沿って設ければ足りるので、従来例に比べて傾斜板の設置枚数が少なくて済み、装置構成が簡易になると共に、装置構成コストも安価なものとしうる。   In the present invention, since the inclined plate is provided on the inner peripheral wall surface of the tank, sedimentation and separation are efficiently performed while water rises along the inner peripheral wall surface of the tank. In the present invention, since it is sufficient to provide the inclined plate along the circumferential wall surface in the tank, the number of inclined plates can be reduced as compared with the conventional example, the device configuration is simplified, and the device configuration cost is low. It can be.

以下、本発明の好ましい形態について説明する。第１図は実施の形態に係る沈殿槽の縦断面図、第２図（ａ）は第１図のII−II線矢視図、第２図（ｂ）は同（ａ）のＢ−Ｂ線断面図である。   Hereinafter, preferred embodiments of the present invention will be described. 1 is a longitudinal sectional view of a sedimentation tank according to an embodiment, FIG. 2 (a) is a view taken along the line II-II in FIG. 1, and FIG. 2 (b) is a cross-sectional view taken along line BB in FIG. It is line sectional drawing.

この実施の形態に係る沈殿槽１０にあっては、槽体１１は円形であり、その中央部にフィードウェル１２が設置されている。このフィードウェル１２は上下両端が開放した円筒状であり、その上端部は槽体１内の水面位よりも上方に突出している。槽体１の中央底部には、沈降した固形分を集めて排出するためのピット状の排出部１３が設けられている。   In the sedimentation tank 10 according to this embodiment, the tank body 11 is circular, and the feed well 12 is installed at the center thereof. The feed well 12 has a cylindrical shape whose upper and lower ends are open, and the upper end of the feed well 12 protrudes upward from the water level in the tank body 1. A pit-shaped discharge portion 13 is provided at the center bottom of the tank body 1 for collecting and discharging the settled solid content.

槽体１１の底部１１ａは、槽体１１の内周壁面１１ｂから中央に向って下り勾配となる円錐形状となっている。   The bottom 11a of the tank body 11 has a conical shape with a downward gradient from the inner peripheral wall surface 11b of the tank body 11 toward the center.

この槽体１１の内周壁面１１ｂに多数の傾斜板１４が設置されている。各傾斜板１４は、略長方形の平板状であり、その一長側辺が内周壁面１１ｂに固着されている。各傾斜板１４同士の間隔は一定であり、各傾斜板１４の傾斜角度θ（水平面に対する仰角）も同一である。この各傾斜板１４の傾斜角度θは４５゜〜８０゜特に約５５〜７０゜程度が好適である。傾斜板１４は、内周壁面１１ｂの全周にわたって設けられている。この実施の形態では、傾斜板１４の下端は槽体底面１１ａから所定距離上方に位置している。また、傾斜板１４の上端は、槽体１１の水面位よりも下方に位置している。傾斜板１４の横幅Ｌは槽体１１の半径の１０〜３０％である。 A large number of inclined plates 14 are installed on the inner peripheral wall surface 11 b of the tank body 11. Each inclined plate 14 has a substantially rectangular flat plate shape, and its one long side is fixed to the inner peripheral wall surface 11b. The interval between the inclined plates 14 is constant, and the inclination angle θ (the elevation angle with respect to the horizontal plane) of each inclined plate 14 is also the same. The inclination angle θ of each inclined plate 14 is preferably about 45 ° to 80 °, particularly about 55 to 70 °. The inclined plate 14 is provided over the entire circumference of the inner peripheral wall surface 11b. In this embodiment, the lower end of the inclined plate 14 is positioned above the tank bottom surface 11a by a predetermined distance. The upper end of the inclined plate 14 is located below the water surface level of the tank body 11. The lateral width L of the inclined plate 14 is 10 to 30 % of the radius of the tank body 11.

内周壁面１１ｂの上部に沿って溢流部としての溢流堰１５が設けられている。   An overflow weir 15 as an overflow portion is provided along the upper portion of the inner peripheral wall surface 11b.

このように構成された沈殿槽１０において、原水はフィードウェル１２内に供給され、主として槽体底面１１ａから槽体内周壁面１１ｂに沿って流れ、溢流堰１５を溢流し、清澄水排出管１６より排出される。この槽体内周壁面１１ｂに沿って流れる間に、傾斜板１４同士を間を流れることにより、効率良く沈降分離処理がなされる。沈降物は、内周壁面１１ｂから槽体底面１１ａに沿って流れ、ピット状の排出部１３に流れ込み、ここから槽体１１外へ排出される。   In the sedimentation tank 10 configured in this manner, raw water is supplied into the feed well 12 and flows mainly from the tank bottom surface 11a along the tank peripheral wall surface 11b, overflows the overflow weir 15, and the clarified water discharge pipe 16 More discharged. By flowing between the inclined plates 14 while flowing along the inner peripheral wall surface 11b of the tank, the sedimentation separation process is efficiently performed. The sediment flows from the inner peripheral wall surface 11b along the tank body bottom surface 11a, flows into the pit-shaped discharge part 13, and is discharged from the tank body 11 from here.

この実施の形態では、傾斜板１４は一方向にのみ傾斜した単板状であるが、第３図のように、波形に屈曲した傾斜板１４Ａであってもよい。   In this embodiment, the inclined plate 14 is a single plate inclined only in one direction, but may be an inclined plate 14A bent in a waveform as shown in FIG.

本発明では、傾斜板１４同士（又は１４Ａ同士）の間にラシヒリング形状の多孔質充填体を充填し、傾斜板同士の間の流路を細かく分割してもよい。   In the present invention, a Raschig ring-shaped porous filler may be filled between the inclined plates 14 (or 14A), and the flow path between the inclined plates may be finely divided.

本発明では、前記第４図のように、槽体底面に沿って回転する集泥用レーキ装置を設けてもよい。   In the present invention, as shown in FIG. 4, a rake device for collecting mud that rotates along the bottom surface of the tank body may be provided.

上記実施の形態では槽体１１は平面視形状が円形である。 In the above embodiment the tank body 11 is a plan view shape Ru circular der.

本発明は、排水処理のほか、各種プロセスでの沈殿槽にも用いることができる。   The present invention can be used for a sedimentation tank in various processes in addition to wastewater treatment.

実施の形態に係る沈殿槽の縦断図である。It is a longitudinal view of the sedimentation tank concerning an embodiment. 図２（ａ）は図１のII−II線矢視図、図２（ｂ）は同（ａ）のＢ−Ｂ線断面図である。2A is a cross-sectional view taken along the line II-II in FIG. 1, and FIG. 2B is a cross-sectional view taken along the line BB in FIG. 別の実施の形態に設けられる傾斜板の側面図である。It is a side view of the inclination board provided in another embodiment. 従来の沈殿槽の縦断面図である。It is a longitudinal cross-sectional view of the conventional sedimentation tank.

符号の説明Explanation of symbols

１０ 沈殿槽
１１ 槽体
１１ｂ 槽体内周壁面
１４，１４Ａ 傾斜板 DESCRIPTION OF SYMBOLS 10 Precipitation tank 11 Tank 11b Circumference wall surface in tank 14, 14A Inclined plate

Claims (1)

円形の槽体の中央部に供給された原水の少なくとも一部が、該槽体の内周壁面に沿って上昇し、該槽体上部の溢流部から清澄水となって流出する沈殿槽において、
該槽体の内周壁面に沿って傾斜板を設けており、
該傾斜板の該内周壁面から該槽体の中央側に延出する横幅は、該槽体の半径の１０〜３０％であることを特徴とする沈殿槽。 In a sedimentation tank in which at least a part of the raw water supplied to the central part of the circular tank body rises along the inner peripheral wall surface of the tank body and flows out as clear water from the overflow part at the top of the tank body ,
An inclined plate is provided along the inner peripheral wall surface of the tank body ,
A sedimentation tank , wherein a lateral width of the inclined plate extending from the inner peripheral wall surface to the center side of the tank body is 10 to 30% of a radius of the tank body .
JP2003432751A 2003-12-26 2003-12-26 Sedimentation tank Expired - Fee Related JP4470486B2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP2003432751A JP4470486B2 (en) 2003-12-26 2003-12-26 Sedimentation tank
TW093138547A TWI262816B (en) 2003-12-26 2004-12-13 Settling basin
KR1020067012335A KR101170572B1 (en) 2003-12-26 2004-12-21 Precipitation tank
CNB2004800390933A CN100404098C (en) 2003-12-26 2004-12-21 Precipitation tank
PCT/JP2004/019062 WO2005063355A1 (en) 2003-12-26 2004-12-21 Precipitation tank

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003432751A JP4470486B2 (en) 2003-12-26 2003-12-26 Sedimentation tank

Publications (2)

Publication Number Publication Date
JP2005185995A JP2005185995A (en) 2005-07-14
JP4470486B2 true JP4470486B2 (en) 2010-06-02

Family

ID=34736485

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2003432751A Expired - Fee Related JP4470486B2 (en) 2003-12-26 2003-12-26 Sedimentation tank

Country Status (5)

Country Link
JP (1) JP4470486B2 (en)
KR (1) KR101170572B1 (en)
CN (1) CN100404098C (en)
TW (1) TWI262816B (en)
WO (1) WO2005063355A1 (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100781400B1 (en) 2006-10-19 2007-11-30 (주)태성이엔씨 Precipitating method in settling pond of sewage disposal plant and settling pond for precipitating
WO2008120704A1 (en) * 2007-03-30 2008-10-09 Kurita Water Industries Ltd. Fluorine-containing wastewater treating apparatus and treating method
JP4877162B2 (en) * 2007-09-03 2012-02-15 栗田工業株式会社 Sedimentation tank
JP4826920B2 (en) * 2007-09-03 2011-11-30 栗田工業株式会社 Sedimentation tank
CN101422662B (en) * 2008-11-28 2013-04-10 友达光电股份有限公司 Solid liquid gas three-phase separation device
CN101766921B (en) * 2010-03-31 2012-07-04 大庆油田有限责任公司 Declining-type oil-water separation device with multilayer wing-shaped plates
CN102974133B (en) * 2012-12-02 2015-04-22 淮北重科矿山机器有限公司 Large deep cone concentration tank
CN104162295A (en) * 2013-05-17 2014-11-26 颜可仁 Sedimentation type mud and sand separator
CN103334789A (en) * 2013-07-16 2013-10-02 王博 Mine hanging scaffold water tank
WO2016095232A1 (en) * 2014-12-19 2016-06-23 深圳市同盛绿色科技有限公司 Water treatment system and vortex sedimentation device therefor
KR200484654Y1 (en) 2017-07-12 2017-11-06 주식회사 정원플랜트 High efficiency precipitation tank
CN109092554B (en) * 2018-06-12 2020-06-19 张日养 Cross-flow type sand-mud washing and separating method and device
KR102025700B1 (en) 2019-06-05 2019-09-26 효림산업주식회사 Radial Circular Clarifier
KR102034148B1 (en) 2019-06-10 2019-10-18 효림산업주식회사 Deep-bed Sludge collector including coagulation & concentration and high turbidity wastewater treatment system containing the same

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8001771U1 (en) * 1979-03-26 1984-02-09 Novex Találmányfejlesztö és Ertékesítö Külkereskedelmi Rt., Budapest DEVICE FOR TREATING LIQUIDS
HU180771B (en) * 1979-03-26 1983-04-29 Imre Gyulavari Apparatus for treating fluids with basin of radial bypass of round or polygon from
JPS60150807A (en) * 1984-01-18 1985-08-08 Toray Ind Inc Settling tank
CN1004399B (en) * 1987-03-12 1989-06-07 中国市政工程西北设技院 Sediment bowl of peripheric inlet-outlet sewage treatment
JPH0693962B2 (en) * 1991-05-08 1994-11-24 株式会社ベンカン Upflow inclined plate sedimentation device
CN2125440U (en) * 1992-05-17 1992-12-23 新疆钢铁公司炼铁厂 Transverse changing flow inclined plate sedimentation pond
JP3676659B2 (en) * 2000-08-22 2005-07-27 株式会社西原環境テクノロジー Solid-liquid separator having stirring flow forming means
KR200395184Y1 (en) 2005-06-22 2005-09-07 최대일 Lamella modules and Fast Sedimentation Device therewith
KR200418339Y1 (en) 2006-03-28 2006-06-13 (주)한맥기술 Water treatment system

Also Published As

Publication number Publication date
JP2005185995A (en) 2005-07-14
KR101170572B1 (en) 2012-08-01
CN1898001A (en) 2007-01-17
CN100404098C (en) 2008-07-23
TWI262816B (en) 2006-10-01
TW200520827A (en) 2005-07-01
WO2005063355A1 (en) 2005-07-14
KR20060114709A (en) 2006-11-07

Similar Documents

Publication Publication Date Title
JP4696646B2 (en) Sedimentation tank
JP4470486B2 (en) Sedimentation tank
JP4259505B2 (en) Sedimentation tank
JP2019089000A (en) Sedimentation tank
CA1279292C (en) Helical flow effluent weir
KR20200078491A (en) Sedimentation tank
JP4825850B2 (en) Floating separator, rectifier, and split cell for rectifier
JP4877162B2 (en) Sedimentation tank
KR100869312B1 (en) Apparatus for purificating polluted water by flotation and sedimentation
JP4826920B2 (en) Sedimentation tank
JPS6210681B2 (en)
JP4720242B2 (en) Sedimentation tank
JP3882464B2 (en) Sedimentation tank
JPH0760016A (en) Water purifying plant
WO2019092974A1 (en) Precipitation tank
KR100591991B1 (en) An Inclined plate setting structure considering coriolis force in circular settling tank
KR20030044443A (en) Venturi type precipitation device
JP3051500B2 (en) Sedimentation concentrator
CN217988468U (en) Water outlet and back-flushing water outlet integrated device for filter tank
JPH0796114B2 (en) Vertical electrolytic levitation type wastewater treatment method and apparatus
Prasad Sedimentation in Water and Used Water Purification
CN211611729U (en) Vertical flow sedimentation tank
KR200358621Y1 (en) An Inclined plate setting structure considering coriolis force in circular settling tank
JP2007069181A (en) Sedimentation basin facility
JP2006272253A (en) Sedimentation tank

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20060907

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20090728

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20090925

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20091027

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: 20100209

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20100222

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

Free format text: PAYMENT UNTIL: 20130312

Year of fee payment: 3

R150 Certificate of patent or registration of utility model

Ref document number: 4470486

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

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

Free format text: PAYMENT UNTIL: 20130312

Year of fee payment: 3

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

Free format text: PAYMENT UNTIL: 20140312

Year of fee payment: 4

LAPS Cancellation because of no payment of annual fees