US3113100A - Separating apparatus - Google Patents

Separating apparatus Download PDF

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Publication number
US3113100A
US3113100A US796582A US79658259A US3113100A US 3113100 A US3113100 A US 3113100A US 796582 A US796582 A US 796582A US 79658259 A US79658259 A US 79658259A US 3113100 A US3113100 A US 3113100A
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United States
Prior art keywords
tank
arms
floor
inlet
nozzles
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 - Lifetime
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US796582A
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English (en)
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Richard P Moore
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Individual
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    • 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
    • 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
    • B01D21/0045—Plurality of essentially parallel plates
    • 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
    • B01D21/18—Construction of the scrapers or the driving 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
    • B01D21/18—Construction of the scrapers or the driving mechanisms for settling tanks
    • B01D21/20—Driving mechanisms
    • 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
    • B01D21/245—Discharge mechanisms for the sediments
    • B01D21/2477—Centrifugal pumps
    • 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
    • B01D21/2488—Feed or discharge mechanisms for settling tanks bringing about a partial recirculation of the liquid, e.g. for introducing chemical aids
    • 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
    • B01D21/30—Control equipment

Definitions

  • the invention also relates to tanks for use in the purification or treatment of water.
  • the invention has particular reference to tanks of the particle or slurry-contact type in which a slurry or particle mass is created and maintained in suspension to assist in the solids liquid separation and treatment of the incoming liquid.
  • the kind of separating unit to which the invention refers exclusively is that including a tank into which the material or liquid to be treated is delivered and a number of arms arranged to sweep over the tank floor for the purpose of motivating sludge or heavy settled fractions towards a draw-off point, clearing the tank floor or merely for maintaining a slurry suspended above the floor.
  • Tanks of this nature are well known but in all separating units within the knowledge of the inventor the arms are always driven through an electrical or mechanical drive of some sort, the driver being located outside the tank.
  • the driving unit for example an electric motor, is located on a bridge above the tank, a drive shaft projecting upwardly from the member on which the arms are nested.
  • the motor is located a well below the tank with the drive shaft projecting through the the tank base.
  • An object of the present invention is to provide a separating unit which has advantages over the units presently in use.
  • separating unit of the kind referred to includes one or more nozzles mounted on the arm or arms an dada-pted to the directed away from the intended direction of rotation of the arm or arms; and means to propel pressure fluid through the or each nozzle to form a driving jet or jets to rotate the arm or arms.
  • the unit includes one or more additional nozzles placed along t e arm or arms and adapted to expel jets of pressure fluid, the additional nozzle or nozzles being located to urge settled fractions towards a discharge point in the tank.
  • the arms are mounted for rotation about a central pivot point at a low level in the tank and fluid for the jets is fed along the arms from the pivot point.
  • the arms are nested around a cap adapted to fit as a sleeve over an upstanding hollow post, the cap and post providing engaging bearing surfaces and the arrangement being such that pressure fluid is fed through the post and into the arms.
  • buoyancy means may be employed to counter-balance the weight of the arms.
  • Bafi'ie means may be provided to direct incoming material to the tank along the floor thereof; in this respect the base of the buoyancy means could be adapted to provide the necessary batlle.
  • vanes may be used, the vanes being coupled to the arms and their inclination being variable. These vanes are preferable of dimensions sufficient also to control the current flow set up in the tank due to movement of the arms.
  • the invention also provides for driving jet nozzles rotatable on the arms so that their inclination to the tank iloor may be varied. Further the driving jets are preferably located far out on the arms and are directed for the jets therefrom to impinge against the walls of the tank. ⁇ For certain applications it may be wise to incorporate nozzles for the additional jets which are also rotatable on the arms so that their inclination to the tank floor may be varied.
  • the invention envisages a unit in which material to be treated is fed into the tank to about mid-point of the floor thereof and the additional nozzles are directed to disperse the material outwardly towards the tank walls.
  • the invention is in no way con-fined to such an arrangement. Circumstances may arise in which the material is fed in at the top or sides of the tank.
  • Draw-oh of heavy settled fractions may take place at any convenient point in the tank. In some cases the draw-off will be at the centre of the tank floor but in the embodiment to be described hereunder the draw-off is positioned at the boundary of the floor and side walls of the tank.
  • means is provided to feed supernatant liquid overflowing at the top of the tank through the nozzles to provide the jet or jets.
  • FIGURE 1 is a plan view of a unit in accordance with the invention with parts broken away;
  • FIGURE 2 is a section on the line 2-2 of FIGURE 1;
  • FIGURE 3 is a sectional side elevation with parts broken away; and FIGURE 4 is a sectional plan of a driving nozzle arrangement.
  • the separation unit includes a cylindrical tank 5, four symmetrically arranged arms 6 nested about a central pivot and adapted to sweep across the floor 7 of the tank, a pump 8 for pumping supernatant liquid overflowing the tank through driving nozzles 9 located far out on the arms and a sump 10 through which heavy settled fractions are removed from the tank by means of pump 11.
  • the liquid being forced through the nozzles 9 emerges in the form of jets and these jets are utilised to propel the arms across the floor of the tank.
  • FIGURE 3 further nozzles 12 are shown and these additional nozzles are used purely for the purpose of directing settled heavy fractions towards the sludge drawoff point constituted by the sump It). In other embodiments it may be necessary to call upon the additional jets to aid in propelling the arms and in these cases the nozzles will have to be inclined rearwardly to ensure that the jets have a sufficient driving component.
  • the phrase material to be treated will be understood as including all sewage, muds, pulps and water requiring treatment such as purification, sedimentation or softening.
  • the material to be treated is urged into the tank through the duct 14 leading to a central discharging point 15 in the tank floor.
  • baffle means to be described later, the material is directed outwardly towards the tank walls 16 at low level.
  • the material On striking the walls the material is given an upward lift and returns towards the centre of the tank on coming into contact with the ring-like deflecting bailie 17 situated about midway up the walls.
  • the additional jets sweep the tank floor and urge them towards the boundary of the tank floor and walls 16.
  • the driving jets are so located that they in turn force the slurry in the region of the boundary referred to towards the sump It).
  • they are arranged to sweep the lower part of the walls clear of any heavy material adhering thereto.
  • only one sump has been shown but circumstances may warrant the use of several such draw-off points. The sump is cleared by means of the pump 11.
  • the post 23 provides a bearing surface at its top for a sleeve 24 which fits over the post rather like a cap.
  • the cap and post are suitably packed to prevent leakage in either direction and the liquid entering the post passes out through perforations 26 in the post.
  • the arms are nested on the sleeve and the arms are in the form of hollow tubes; liquid flowing along the arms from the sleeves.
  • buoyancy means 27 is provided. This means takes the form of a conically shaped air filled vessel with a de- Slots 29 in the skirt allow for the location of the arms and the skirt itself ensures that material entering the tank is not allowed to how vertically to disturb the liquid in the quiescent zone. As shown in FIG- URE 3 the material is forced to follow the path shown by arrows 30.
  • fixed nozzles are used but circum stances may arise in which the angle of inclination of the nozzles might require alteration. They may therefore be rotatably mounted on the arms.
  • FIGURES 1 and 4 the arrow 31 indicates the direc tion of movement of the arms while the arrows 32 in FIGURE 4 indicate the flow of pressure liquid through a driving nozzle 9.
  • vanes 33 to control the speed of the arms across the tank floor. These vanes are located on the arms and may be rotated thereon into any desired position. With the type of vane shown in the figures useful control is obtained over the currents set up in the lower half of the tank. By inclining them in the direction of travel the heavy fractions will a be urged to pass under the arms as they sweep across the Stay wires 35 give added support to the arms and relieve the strain on the sleeve 24.
  • a mast 36 is provided for the purpose of indicating the behaviour of the arms, the mast terminating in a suitable tell-tale means 37 projecting above the level of liquid in the tank.
  • the number of driving jets will depend upon the type of operation for which the tank is required. Obviously heavy slurries will require more driving jets than in the case of light slurries for the same nozzle pressures.
  • the arms are shown as having five driving nozzles each. The jets formed by these nozzles impact A ⁇ against the heavy slurry in the lower half of the tank and against the tank walls and the resultant reaction forces the arms around the floor in the. direction of the arrow 31.
  • a separating unit comprising a tank having a floor and side wall means, an inlet for liquid to be treated, said inlet terminating at said fioor, an outlet for treated liquid near the top of said tank, a hub, a plurality of hollow arms each having one end mounted on said hub and being rotatable in said tank adjacent to said floor, a supply pipe for liquid under pressure, means located in said tank and connected with said supply pipe for rotatably supporting said hub and for establishing communication between said supply pipe and said arms, a sludge pocket in said floor, said arms having sections passing over said sludge pocket during rotation of said arms, an annular portion of said floor vertically below said sections and including said sludge pocket, nozzles mounted on said sections and directed laterally from said arms to discharge jets directed along said annular portion and by their reaction impart rotation to said arms, and other nozzles on said arms directed downwardly from said arms and radially outward from the center of said tank toward said annular portion to induce a radial flow toward said annular portion during rotation
  • a separating unit comprising a tank having a floor and side wall means, inlet means for liquid to be treated, said inlet means terminating at the central portion of said floor, outlet means for withdrawing treated liquid near the top of said tank, a plurality of hollow arms rotatable in said tank adjacent to said floor, a supply pipe for liquid under pressure, means centrally located in said tank and connected with said supply pipe for rotatably supporting said arms and for establishing communication between said supply pipe and said arms, rotatable batlie means adjacent to said floor, connected with said arms and facing said inlet means to divert the direction of flow of liquid entering through said inlet means and to cause in said tank immediately adjacent to said floor a horizontal flow directed from said inlet means toward said side wall means, and a plurality of nozzles mounted on and connected with said hollow arms, certain of said nozzles being directed laterally from said arms to impart rotation to said arms and others of said nozzles being directed downwardly from said arms and outwardly from the center of said tank to aid said horizontal flow.
  • a pump having an inlet and an outlet, said inlet being connected with said outlet means, and said outlet being connected with said supply pipe.
  • a separating unit comprising a tank having a floor and side wall means, an inlet for liquid to be treated, said inlet terminating at the central portion of said floor, an outlet for treated liquid near the top of said tank, a hub, a plurality of hollow arms mounted on said hub and rotatable in said tank adjacent to said floor, a supply pipe for liquid under pressure, support means located in said tank and connected with said supply pipe for rotatably supporting said hub and for establishing communication between said supply pipe and said arms, bafile means adjacent to said floor, and facing said inlet to divert the direction of flow of liquid entering through said inlet and to cause in said tank immediately adjacent to said floor a horizontal flow directed from said inlet toward said side wall means, a plurality of nozzles mounted on and connected with said hollow arms, certain of said nozzles being directed laterally from said arms to impart rotation to said arms and others of said nozzles being directed downwardly from said arms and outwardly from the center of said tank to aid said horizontal flow, and a mast extending inwardly from said side wall
  • a separating unit comprising a tank having a floor and side wall means, an inlet for liquid to be treated, said inlet terminating at the central portion of said floor, an outlet for treated liquid near the top of said tank, a plurality of hollow arms rotatable in said tank adjacent to said floor, a supply pipe for liquid under pressure, means centrally located in said tank and connected with said supply pipe for rotatably supporting said arms and for establishing communication between said supply pipe and said arms, ba'tlle means facing said inlet to cause in said tank immediately adjacent to said floor a horizontal flow radially away from said inlet, a plurality of nozzles mounted on and connected with said hollow arms, certain of said nozzles being directed laterally from said arms to impart rotation to said arms and others of said nozzles being directed downwardly from said arms and outwardly from the center of said tank to aid said horizontal flow, and an annular baffie extending parallel to said floor and horizontally along the lower portion of said side wall means at an elevation above said arms and below the top of said tank to reverse the
  • a separating unit comprising a tank having a floor and side wall means, an inlet for liquid to be treated, said inlet terminating at the central portion of said floor, an outlet for treated liquid near the top of said tank, a plurality of hollow arms rotatable in said tank adjacent to said floor, a supply pipe for liquid under pressure, means centrally located in said tank and connected with said supply pipe for rotatably supporting said arms and for establishing communication between said supply pipe and said arms, baffle means facing said inlet to cause in said tank adjacent to said floor a horizontal flow away from said inlet, a plurality of nozzles mounted on and connected with said hollow arms, certain of said nozzles being directed laterally from said arms to impart rotation to said arms and others of said nozzles 6 being directed downwardly from said arms and outwardly from the center of said tank to aid said horizontal flow, and vertical batlles mounted on said side wall means and extending inwardly from said side wall means toward the center of said tank and upwardly in said tank from a level above said arms.
  • annular baffie having a horizontal lower face extending from said side wall means towards the vertical center line of said tank and an inclined upper face sloping from said side wall means downwardly towards the vertical center line of said tank.
  • a separating unit comprising a tank having a fioor and side wall means, an inlet for liquid to be treated located at said floor, a sludge pocket in said floor remote from said inlet, deflector means located at a low level in said tank and facing said inlet to deflect the direction of flow of said incoming liquid to create a radially outward flow along said floor in a horizontal stratum, a peripheral bafile on the lower portion of said side wall means extending parallel to said door to re-deflect said radially outward flow towards the vertical.
US796582A 1958-03-08 1959-03-02 Separating apparatus Expired - Lifetime US3113100A (en)

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ZA3113100X 1958-03-08

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3215274A (en) * 1964-12-21 1965-11-02 Schreiber August Device for the biological purification of sewage
US3941704A (en) * 1973-05-11 1976-03-02 Richard Pierpont Moore Liquid conditioning and settling tanks
US4049549A (en) * 1971-02-19 1977-09-20 Richard Pierpoint Moore Liquid condition and settling tanks
US5527454A (en) * 1994-04-26 1996-06-18 Jacobs Environmental, Inc. Mechanical ventilation system to capture gases released from wastewater passing through rock media trickling filters
WO2007090924A1 (fr) * 2006-02-10 2007-08-16 Outotec Oyj. Mecanisme de support de bras de rateau pour epaississeur
US20120061334A1 (en) * 2010-09-14 2012-03-15 Fort Hills Energy Inc. Settler with overflow recycle

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1152769A (en) * 1912-06-12 1915-09-07 Lamartine C Trent Apparatus for treating solid-bearing solutions.
US2036809A (en) * 1934-02-03 1936-04-07 Humphreys Edwin William Arnold Sedimentation apparatus or thickener
US2267608A (en) * 1941-12-23 Sewage sedimentation system
US2649412A (en) * 1951-04-13 1953-08-18 Process Engineers Inc Clarification
US2678912A (en) * 1949-11-04 1954-05-18 Infilco Inc Apparatus for separating grit and grease from waste waters
US2816661A (en) * 1953-11-25 1957-12-17 Bounin Claude Decanting liquids containing flocculated material
US2899071A (en) * 1959-08-11 Bounin

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2267608A (en) * 1941-12-23 Sewage sedimentation system
US2899071A (en) * 1959-08-11 Bounin
US1152769A (en) * 1912-06-12 1915-09-07 Lamartine C Trent Apparatus for treating solid-bearing solutions.
US2036809A (en) * 1934-02-03 1936-04-07 Humphreys Edwin William Arnold Sedimentation apparatus or thickener
US2678912A (en) * 1949-11-04 1954-05-18 Infilco Inc Apparatus for separating grit and grease from waste waters
US2649412A (en) * 1951-04-13 1953-08-18 Process Engineers Inc Clarification
US2816661A (en) * 1953-11-25 1957-12-17 Bounin Claude Decanting liquids containing flocculated material

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3215274A (en) * 1964-12-21 1965-11-02 Schreiber August Device for the biological purification of sewage
US4049549A (en) * 1971-02-19 1977-09-20 Richard Pierpoint Moore Liquid condition and settling tanks
US3941704A (en) * 1973-05-11 1976-03-02 Richard Pierpont Moore Liquid conditioning and settling tanks
US5527454A (en) * 1994-04-26 1996-06-18 Jacobs Environmental, Inc. Mechanical ventilation system to capture gases released from wastewater passing through rock media trickling filters
WO2007090924A1 (fr) * 2006-02-10 2007-08-16 Outotec Oyj. Mecanisme de support de bras de rateau pour epaississeur
US20120061334A1 (en) * 2010-09-14 2012-03-15 Fort Hills Energy Inc. Settler with overflow recycle
US8795537B2 (en) * 2010-09-14 2014-08-05 Fort Hills Energy L.P. Settler with overflow recycle

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Publication number Publication date
FR1224359A (fr) 1960-06-23

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