GB1424261A - Clarification of liquid - Google Patents

Clarification of liquid

Info

Publication number
GB1424261A
GB1424261A GB186273A GB186273A GB1424261A GB 1424261 A GB1424261 A GB 1424261A GB 186273 A GB186273 A GB 186273A GB 186273 A GB186273 A GB 186273A GB 1424261 A GB1424261 A GB 1424261A
Authority
GB
United Kingdom
Prior art keywords
bridge
sludge
nozzles
tank
apertures
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
Application number
GB186273A
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.)
FMC Corp
Original Assignee
FMC Corp
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
Priority claimed from US00217378A external-priority patent/US3807560A/en
Application filed by FMC Corp filed Critical FMC Corp
Publication of GB1424261A publication Critical patent/GB1424261A/en
Expired legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D21/00Separation of suspended solid particles from liquids by sedimentation
    • B01D21/02Settling tanks with single outlets for the separated liquid
    • B01D21/04Settling tanks with single outlets for the separated liquid with moving scrapers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D21/00Separation of suspended solid particles from liquids by sedimentation
    • B01D21/18Construction of the scrapers or the driving mechanisms for settling tanks
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D21/00Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24Feed or discharge mechanisms for settling tanks
    • B01D21/245Discharge mechanisms for the sediments
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D21/00Separation of suspended solid particles from liquids by sedimentation
    • B01D21/30Control equipment
    • B01D21/302Active control mechanisms with external energy, e.g. with solenoid valve
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D21/00Separation of suspended solid particles from liquids by sedimentation
    • B01D21/30Control equipment
    • B01D21/32Density control of clear liquid or sediment, e.g. optical control ; Control of physical properties
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D21/00Separation of suspended solid particles from liquids by sedimentation
    • B01D21/30Control equipment
    • B01D21/34Controlling the feed distribution; Controlling the liquid level ; Control of process parameters

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Centrifugal Separators (AREA)

Abstract

1424261 Settling tank for sewage sludge F M C CORP 12 Jan 1973 [12 Jan 1972 (2)] 1862/73 Heading B1D [Also in Division Cl] Settled sludge is withdrawn from the floor of a rectangular settling tank by suction nozzles suspended from a reciprocating bridge, the nozzles being of inverted T form (Fig. 3, not shown) and having horizontal sections with apertures 90 and blades 92 which direct sludge into the apertures. In Figs. 1 to 4, nozzles are arranged in pairs and one nozzle of each pair operates depending on the direction of bridge movement. Apertures 90 vary in diameter and/ or spacing with distance from the vertical parts 84 of the nozzles to compensate for variation in suction, as illustrated in Figs. 9, 10, 11, 15 (not shown). The suction is created by delivering compressed air to parts 84 of the nozzles which act as air lift pumps, and parts 84 discharge into a trough 44 on the bridge which discharges to a gutter on the tank wall. In Figs. 1 to 4, liquid flows along the tank in the direction of bridge movement, and overflow channels (26) for clean liquid extend lengthwise between the nozzles. The bridge is moved by a motor powered by a supply whose frequency is varied in steps, by a bridge extension engaging cams on the tank wall, to vary the bridge speed so that it moves more slowly over regions where most sludge will have accumulated since the previous traverse. Valves 96, 98 enable air supply to the nozzles to be adjusted to compensate for lateral variations in sludge thickness, and these arrangements ensure that sludge of uniform solids content is withdrawn from the tank, whence it may be recycled to an aeration stage. In Figs. 5 to 8, the bridge speed is controlled by probes (140) which depend from the bridge and vary the bridge motor frequency in response to variations which they detect in sludge thickness. Positive displacement or centrifugal pumps draw the sludge through the nozzles, and valves (136) enable control of pumping speed. In Fig. 5 the pair of nozzles of Fig. 4 replaced by one nozzle with two sets of apertures 106, 108, one of which is closed in each direction of movement by a pivoted blade 110 actuated through cables by a motor controlled by the bridge limit switches. Fig. 6 (not shown) illustrates a simpler construction wherein one set of apertures cooperates with a blade pivoted by end stops. In Figs. 12 to 15 (not shown) the liquid flows through the tank perpendicular to the bridge movement. The bridge speed is varied as in Figs. 1 to 4, and each nozzle has means monitoring the sludge concentration therein and continuously adjusting a valve as the bridge traverses so that the sludge concentration remains uniform. The valve may control the sludge flow directly through a centrifugal pump or control the air supply to an air lift nozzle. Nozzles are designed to compensate for some being located in regions where more sludge will settle than others. This embodiment includes a skimmer which pushes scum into a trough on one side of the tank and is lifted clear of the liquid when the bridge moves away from the trough.
GB186273A 1972-01-12 1973-01-12 Clarification of liquid Expired GB1424261A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US21737972A 1972-01-12 1972-01-12
US00217378A US3807560A (en) 1972-01-12 1972-01-12 Method and apparatus for removing solids

Publications (1)

Publication Number Publication Date
GB1424261A true GB1424261A (en) 1976-02-11

Family

ID=26911885

Family Applications (1)

Application Number Title Priority Date Filing Date
GB186273A Expired GB1424261A (en) 1972-01-12 1973-01-12 Clarification of liquid

Country Status (1)

Country Link
GB (1) GB1424261A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990009834A1 (en) * 1989-03-02 1990-09-07 Richard Totzke Maschinen- Und Apparatebau Gmbh & Co. Device for removing bottom and surface sludge from sewage-treatment basins or the like
GB2343128A (en) * 1998-10-29 2000-05-03 Cyclotech Ltd Apparatus for conveying solid material within a separator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990009834A1 (en) * 1989-03-02 1990-09-07 Richard Totzke Maschinen- Und Apparatebau Gmbh & Co. Device for removing bottom and surface sludge from sewage-treatment basins or the like
GB2343128A (en) * 1998-10-29 2000-05-03 Cyclotech Ltd Apparatus for conveying solid material within a separator
US6619889B1 (en) 1998-10-29 2003-09-16 Cyclotech Limited Conveyor apparatus

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Legal Events

Date Code Title Description
CSNS Application of which complete specification have been accepted and published, but patent is not sealed