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)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

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ID=34736485

Family Applications (1)

Country Status (5)

Cited By (1)

Families Citing this family (13)

Citations (3)

Family Cites Families (6)

• 2003
  • 2003-12-26 JP JP2003432751A patent/JP4470486B2/ja not_active Expired - Fee Related
• 2004
  • 2004-12-13 TW TW093138547A patent/TWI262816B/zh not_active IP Right Cessation
  • 2004-12-21 KR KR1020067012335A patent/KR101170572B1/ko active IP Right Grant
  • 2004-12-21 WO PCT/JP2004/019062 patent/WO2005063355A1/ja active Application Filing
  • 2004-12-21 CN CNB2004800390933A patent/CN100404098C/zh not_active Expired - Fee Related

Patent Citations (3)

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