WO2005063355A1 - Precipitation tank - Google Patents

Precipitation tank Download PDF

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Publication number
WO2005063355A1
WO2005063355A1 PCT/JP2004/019062 JP2004019062W WO2005063355A1 WO 2005063355 A1 WO2005063355 A1 WO 2005063355A1 JP 2004019062 W JP2004019062 W JP 2004019062W WO 2005063355 A1 WO2005063355 A1 WO 2005063355A1
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WO
WIPO (PCT)
Prior art keywords
tank body
tank
peripheral wall
inner peripheral
sedimentation
Prior art date
Application number
PCT/JP2004/019062
Other languages
French (fr)
Japanese (ja)
Inventor
Rajeev Goel
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 KR1020067012335A priority Critical patent/KR101170572B1/en
Publication of WO2005063355A1 publication Critical patent/WO2005063355A1/en

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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
    • B01D21/0039—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
    • 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

Definitions

  • the present invention relates to a sedimentation tank (sedimentation separation apparatus) for performing sedimentation and separation treatment of raw water, and in particular, at least a part of raw water supplied to a central portion of the tank body extends along an inner peripheral wall surface of the tank body.
  • the present invention relates to a sedimentation tank configured to ascend to clear water and to discharge the clear water to the overflow portion.
  • the sedimentation / separation device includes a natural sedimentation / separation device, an inclined sedimentation / separation device, a coagulated sedimentation / separation device, and the like.
  • the horizontal flow type sedimentation basin is provided with an inflow / outflow rectification wall or an intermediate rectification wall as soon as a density flow is generated to make the flow uniform and improve the separation efficiency.
  • Circular sedimentation equipment makes it easy to collect sedimentation sludge.
  • Fig. 4 shows an example of the structure of a circular sedimentation tank.
  • the raw water supplied through a raw water supply pipe 3 to a center well 2 provided in the center of the tank body 1 is placed under the lower power tank body 1 of the center well 2. It spreads and then ascends inside the tank body 1, during which time solids are settled and separated, and clear water overflows the overflow weir 4 and flows out of the tank body.
  • the sedimented sludge is collected by a sludge collecting rake 6 that is rotationally driven by a driving device 5, and is collected through a discharging pipe 8 and discharged.
  • the inclined sedimentation separation apparatus is an apparatus in which an inclined plate or a horizontal plate is inserted into a sedimentation tank. A clarified liquid is generated on the lower surface of the plate, and the sedimentation area is increased by an amount corresponding to the insertion area, and the clarified liquid is grown. It uses the principle that speed increases. Therefore, the separation area can be increased in proportion to the insertion area of the plate, and the water area load (m 3 Zm) can be reduced, so that particles having a low sedimentation velocity can be separated.
  • a sedimentation tank provided with this inclined plate is described in Japanese Utility Model Publication No. 5-45363, Japanese Patent Application Laid-Open No. 5-200205, and the like.
  • the inclined plate is installed over a wide range, and the cost is high. is there.
  • Patent Document 1 Japanese Utility Model Publication No. 5-45363
  • Patent Document 2 JP-A-5-200205
  • An object of the present invention is to provide a sedimentation tank having a relatively simple configuration and excellent sedimentation and separation characteristics of solids.
  • the sedimentation tank of the present invention at least a 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, and the overflowing part force of the upper part of the tank body A slanting plate is provided along the inner peripheral wall surface of the sedimentation tank in the sedimentation tank flowing out.
  • the inclined plate is provided on the peripheral wall surface of the inside of the tank, the sedimentation / separation treatment is efficiently performed while the water rises along the peripheral wall surface of the inside of the tank.
  • the number of the inclined plates to be installed can be reduced as compared with the conventional example, the apparatus configuration is simplified, and the apparatus configuration cost is low. It can be.
  • FIG. 1 is a longitudinal sectional view of a settling tank according to an embodiment.
  • FIG. 2a is a sectional view taken along line II-II of FIG. 1
  • FIG. 2b is a sectional view taken along line BB of FIG. 2a.
  • FIG. 3 is a side view of an inclined plate provided in another embodiment.
  • FIG. 4 is a longitudinal sectional view of a conventional sedimentation tank.
  • FIGS. 1, 2a and 2b a preferred embodiment of the present invention will be described with reference to FIGS. 1, 2a and 2b.
  • the tank body 11 has a circular shape, and a feedwell 12 is provided at the center thereof.
  • the feedwell 12 has a cylindrical shape whose upper and lower ends are open, and its upper end protrudes above the water level in the tank body 1.
  • a pit-shaped discharge section 13 is provided at the center bottom of the tank body 1 to discharge the settled solids. It is.
  • the bottom 11a of the tank 11 has a conical shape having a downward slope from the lower end of the inner peripheral wall lib of the tank 11 toward the center.
  • a large number of inclined plates 14 are provided on the inner peripheral wall l ib of the tank body 11.
  • Each inclined plate 14 has a substantially rectangular flat plate shape, and one long side thereof is fixed to the inner peripheral wall surface lib.
  • the interval between the inclined plates 14 is constant, and the inclined angle ⁇ (elevation angle with respect to the horizontal plane) of each inclined plate 14 is also the same.
  • the inclination angle ⁇ of each inclined plate 14 is preferably 45 ° -80 °, particularly about 55-70 °.
  • the inclined plate 14 is provided over the entire circumference of the inner peripheral wall surface l ib.
  • the lower end of the inclined plate 14 is located a predetermined distance above the tank body bottom surface 11a.
  • the upper end of the inclined plate 14 is located below the water surface of the tank 11.
  • the width L of the inclined plate 14 is preferably about 10 to 30% of the radius of the tank 11.
  • An overflow weir 15 as an overflow portion is provided along an upper portion of the inner peripheral wall l ib.
  • the raw water is supplied into the feedwell 12, flows mainly along the tank body bottom surface 11 a along the tank body peripheral wall surface lib, overflows the overflow weir 15, and is cleaned. It is discharged from the clear water discharge pipe 16.
  • the sedimentation separation process is performed efficiently.
  • the sediment flows from the inner peripheral wall surface l ib along the tank body bottom surface 11a, flows into the pit-shaped discharge portion 13, and is discharged out of the tank body 11 therefrom.
  • the inclined plate 14 may be a single plate-like inclined force only in one direction. As shown in FIG. 3, the inclined plate 14A may be a zigzag bent vertical plate 14A.
  • a Raschig-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.
  • a rake device for collecting mud that rotates along the bottom surface of the tank body may be provided.
  • the tank body 11 has a circular shape in plan view, but may have a rectangular shape, a pentagonal or more polygonal shape, an elliptical shape, or the like.
  • the present invention can be used in sedimentation tanks in various processes in addition to wastewater treatment.

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

Abstract

A precipitation tank capable of providing excellent solid matter setting characteristics by a rather simple structure, wherein a raw water is fed into a feed well (12), flows mainly from the bottom face (11a) of a tank body along the inner peripheral wall surface (11b) of the tank body, overflows an overflow weir (15), and is discharged from a clarified water discharge tube (16). While the raw water flows along the inner peripheral wall surface (11b) of the tank body, the water can be efficiently settled since the water flows between tilted plates (14). Deposit flows from the inner peripheral wall surface (11b) along the bottom face (11a) of the tank body, flows into a pit-like discharge part (13), and is discharged from the discharge part to the outside of the tank body (11).

Description

明 細 書  Specification
沈殿槽  Settling tank
発明の分野  Field of the invention
[0001] 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力 流出するよう構成された沈殿槽に関する。 発明の背景  [0001] The present invention relates to a sedimentation tank (sedimentation separation apparatus) for performing sedimentation and separation treatment of raw water, and in particular, at least a part of raw water supplied to a central portion of the tank body extends along an inner peripheral wall surface of the tank body. The present invention relates to a sedimentation tank configured to ascend to clear water and to discharge the clear water to the overflow portion. Background of the Invention
[0002] 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。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。  [0002] The sedimentation / separation device includes a natural sedimentation / separation device, an inclined sedimentation / separation device, a coagulated sedimentation / separation device, and the like. There are two types of natural sedimentation separators, rectangular and circular.Rectangle is usually horizontal flow and is called cross-flow type sedimentation basin. Is a horizontal flow type.
[0003] 横流式沈殿池は、密度流が発生しやすぐ流入、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を図 4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ゥエル 2に原水供給管 3を介して供給された 原水が、該センターゥエル 2の下部力 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。  [0003] The horizontal flow type sedimentation basin is provided with an inflow / outflow rectification wall or an intermediate rectification wall as soon as a density flow is generated to make the flow uniform and improve the separation efficiency. Circular sedimentation equipment makes it easy to collect sedimentation sludge. Fig. 4 shows an example of the structure of a circular sedimentation tank. In this circular sedimentation tank, the raw water supplied through a raw water supply pipe 3 to a center well 2 provided in the center of the tank body 1 is placed under the lower power tank body 1 of the center well 2. It spreads and then ascends inside the tank body 1, during which time solids are settled and separated, and clear water overflows the overflow weir 4 and flows out of the tank body. The sedimented sludge is collected by a sludge collecting rake 6 that is rotationally driven by a driving device 5, and is collected through a discharging pipe 8 and discharged.
[0004] 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 (m3Zm )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。 [0004] The inclined sedimentation separation apparatus is an apparatus in which an inclined plate or a horizontal plate is inserted into a sedimentation tank. A clarified liquid is generated on the lower surface of the plate, and the sedimentation area is increased by an amount corresponding to the insertion area, and the clarified liquid is grown. It uses the principle that speed increases. Therefore, the separation area can be increased in proportion to the insertion area of the plate, and the water area load (m 3 Zm) can be reduced, so that particles having a low sedimentation velocity can be separated.
[0005] 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。しかしながら、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。 [0005] A sedimentation tank provided with this inclined plate is described in Japanese Utility Model Publication No. 5-45363, Japanese Patent Application Laid-Open No. 5-200205, and the like. However, in the sedimentation tanks disclosed in Japanese Utility Model Publication No. 5-45363 and Japanese Patent Application Laid-Open No. 5-200205, the inclined plate is installed over a wide range, and the cost is high. is there.
特許文献 1：実公平 5-45363号公報  Patent Document 1: Japanese Utility Model Publication No. 5-45363
特許文献 2：特開平 5— 200205号公報  Patent Document 2: JP-A-5-200205
発明の概要  Summary of the Invention
[0006] 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。  [0006] An object of the present invention is to provide a sedimentation tank having a relatively simple configuration and excellent sedimentation and separation characteristics of solids.
[0007] 本発明の沈殿槽は、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力 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たことを特徴とするものである  [0007] In the sedimentation tank of the present invention, at least a 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, and the overflowing part force of the upper part of the tank body A slanting plate is provided along the inner peripheral wall surface of the sedimentation tank in the sedimentation tank flowing out.
[0008] 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。 [0008] In the sedimentation 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 wall. During this time, sedimentation and separation of solids are performed, and the clarified water overflows the overflow at the top of the tank.
[0009] 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 peripheral wall surface of the inside of the tank, the sedimentation / separation treatment is efficiently performed while the water rises along the peripheral wall surface of the inside of the tank. In the present invention, since it is sufficient that the inclined plate is provided along the inner peripheral wall surface of the tank body, the number of the inclined plates to be installed can be reduced as compared with the conventional example, the apparatus configuration is simplified, and the apparatus configuration cost is low. It can be.
図面の簡単な説明  Brief Description of Drawings
[0010] [図 1]実施の形態に係る沈殿槽の縦断図である。 FIG. 1 is a longitudinal sectional view of a settling tank according to an embodiment.
[図 2]図 2aは図 1の II— II線矢視図、図 2bは図 2aの B— B線断面図である。  FIG. 2a is a sectional view taken along line II-II of FIG. 1, and FIG. 2b is a sectional view taken along line BB of FIG. 2a.
[図 3]別の実施の形態に設けられる傾斜板の側面図である。  FIG. 3 is a side view of an inclined plate provided in another embodiment.
[図 4]従来の沈殿槽の縦断面図である。  FIG. 4 is a longitudinal sectional view of a conventional sedimentation tank.
発明の好ましレ、形態の詳細な説明  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0011] 以下、本発明の好ましい形態について図 1, 2a及び 2bを参照して説明する。 Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. 1, 2a and 2b.
[0012] 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 フィードゥエル 12が設置されている。このフィードゥエル 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、沈降した固形分魏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。 [0012] In the sedimentation tank 10 according to this embodiment, the tank body 11 has a circular shape, and a feedwell 12 is provided at the center thereof. The feedwell 12 has a cylindrical shape whose upper and lower ends are open, and its upper end protrudes above the water level in the tank body 1. A pit-shaped discharge section 13 is provided at the center bottom of the tank body 1 to discharge the settled solids. It is.
[0013] 槽体 11の底部 11aは、槽体 11の内周壁面 l ibの下端から中央に向って下り勾配 となる円錐形状となって 、る。  [0013] The bottom 11a of the tank 11 has a conical shape having a downward slope from the lower end of the inner peripheral wall lib of the tank 11 toward the center.
[0014] この槽体 11の内周壁面 l ib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 l ib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 l ib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%程度が好適である。  [0014] A large number of inclined plates 14 are provided on the inner peripheral wall l ib of the tank body 11. Each inclined plate 14 has a substantially rectangular flat plate shape, and one long side thereof is fixed to the inner peripheral wall surface lib. The interval between the inclined plates 14 is constant, and the inclined angle 各 (elevation angle with respect to the horizontal plane) of each inclined plate 14 is also the same. The inclination angle 傾斜 of each inclined plate 14 is preferably 45 ° -80 °, particularly about 55-70 °. The inclined plate 14 is provided over the entire circumference of the inner peripheral wall surface l ib. In this embodiment, the lower end of the inclined plate 14 is located a predetermined distance above the tank body bottom surface 11a. The upper end of the inclined plate 14 is located below the water surface of the tank 11. The width L of the inclined plate 14 is preferably about 10 to 30% of the radius of the tank 11.
[0015] 内周壁面 l ib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 an upper portion of the inner peripheral wall l ib.
[0016] このように構成された沈殿槽 10において、原水はフィードゥエル 12内に供給され、 主として槽体底面 11aから槽体内周壁面 l ib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 l ib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 l ib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 as described above, the raw water is supplied into the feedwell 12, flows mainly along the tank body bottom surface 11 a along the tank body peripheral wall surface lib, overflows the overflow weir 15, and is cleaned. It is discharged from the clear water discharge pipe 16. By flowing between the inclined plates 14 while flowing along the peripheral wall surface ib of the tank body, the sedimentation separation process is performed efficiently. The sediment flows from the inner peripheral wall surface l ib along the tank body bottom surface 11a, flows into the pit-shaped discharge portion 13, and is discharged out of the tank body 11 therefrom.
[0017] 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力 第 3図 のように、上下方向にジグザグ形に屈曲した傾斜板 14Aであってもよ 、。  In this embodiment, the inclined plate 14 may be a single plate-like inclined force only in one direction. As shown in FIG. 3, the inclined plate 14A may be a zigzag bent vertical plate 14A.
[0018] 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力べ分割してもよい。  In the present invention, a Raschig-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.
[0019] 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。  [0019] 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.
[0020] 上記実施の形態では槽体 11は平面視形状が円形であるが、方形や五角形以上の 多角形、楕円形等であってもよい。  [0020] In the above embodiment, the tank body 11 has a circular shape in plan view, but may have a rectangular shape, a pentagonal or more polygonal shape, an elliptical shape, or the like.
[0021] 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。 [0021] The present invention can be used in sedimentation tanks in various processes in addition to wastewater treatment.

Claims

請求の範囲 The scope of the claims
[1] 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力 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少なくとも 1枚の傾斜板を設けたことを特徴とする沈殿槽。  [1] At least a part of the raw water supplied to the central portion of the tank body rises along the inner peripheral wall surface of the tank body, and overflows at the upper part of the tank body. 3. The sedimentation tank according to claim 1, wherein at least one inclined plate is provided along an inner peripheral wall surface of the tank body.
[2] 請求項 1にお 、て、槽体の中央にフィードゥエルが設けられ、これを通して原水が槽 体内の底部へ供給されることを特徴とする沈殿槽。 [2] The sedimentation tank according to claim 1, wherein a feedwell is provided at the center of the tank body, through which raw water is supplied to the bottom of the tank body.
[3] 請求項 2において、槽体の底面は、内周壁面の下端から中央に向って下り勾配とな つて 、ることを特徴とする沈殿槽。 [3] The settling tank according to claim 2, wherein the bottom surface of the tank body is inclined downward from the lower end of the inner peripheral wall toward the center.
[4] 請求項 1にお 、て、傾斜板は略長方形の平板状であり、その一長側辺が内周壁面 に固着されていることを特徴とする沈殿槽。 [4] The settling tank according to claim 1, wherein the inclined plate has a substantially rectangular flat plate shape, and one long side thereof is fixed to the inner peripheral wall surface.
[5] 請求項 1にお 、て、複数の傾斜板が一定の間隔をあけて槽体の全周にわたつて設 けられて 、ることを特徴とする沈殿槽。 [5] The sedimentation tank according to claim 1, wherein a plurality of inclined plates are provided around the entire circumference of the tank body at a predetermined interval.
[6] 請求項 1において、傾斜板の傾斜角度すなわち水平面に対する仰角は 45° — 80[6] In claim 1, the inclination angle of the inclined plate, that is, the elevation angle with respect to the horizontal plane is 45 ° — 80
° であることを特徴とする沈殿槽。 ° settling tank.
[7] 請求項 4において、傾斜板の横幅は槽体の半径の 10— 30%であることを特徴とす る沈殿槽。 [7] The settling tank according to claim 4, wherein the width of the inclined plate is 10 to 30% of the radius of the tank body.
[8] 請求項 1にお 、て、傾斜板は上下方向をジグザグに屈曲して 、ることを特徴とする 沈殿槽。  [8] The settling tank according to claim 1, wherein the inclined plate is bent in a zigzag manner in a vertical direction.
[9] 請求項 1において、槽体底面に沿って回転する集泥用レーキ装置が設けられてい ることを特徴とする沈殿槽。  [9] The sedimentation tank according to claim 1, further comprising a mud collecting rake device that rotates along the bottom of the tank body.
PCT/JP2004/019062 2003-12-26 2004-12-21 Precipitation tank WO2005063355A1 (en)

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CN1898001A (en) 2007-01-17
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CN100404098C (en) 2008-07-23
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JP2005185995A (en) 2005-07-14
TWI262816B (en) 2006-10-01
KR20060114709A (en) 2006-11-07

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