US20020056678A1 - Coagulating sedimentation apparatus - Google Patents
Coagulating sedimentation apparatus Download PDFInfo
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- US20020056678A1 US20020056678A1 US09/986,924 US98692401A US2002056678A1 US 20020056678 A1 US20020056678 A1 US 20020056678A1 US 98692401 A US98692401 A US 98692401A US 2002056678 A1 US2002056678 A1 US 2002056678A1
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- mixing chamber
- liquid
- rotary support
- sedimentation apparatus
- tank
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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
- B01D21/2405—Feed mechanisms for settling tanks
- B01D21/2416—Liquid distributors with a plurality of feed points
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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
- B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
- B01D21/0042—Baffles or guide 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
- B01D21/10—Settling tanks with multiple outlets for the separated liquids
- B01D21/12—Settling tanks with multiple outlets for the separated liquids with moving scrapers
- B01D21/14—Settling tanks with multiple outlets for the separated liquids with moving scrapers with rotating scrapers
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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
- B01D21/10—Settling tanks with multiple outlets for the separated liquids
- B01D21/16—Settling tanks with multiple outlets for the separated liquids provided with flocculating compartments
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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
- B01D21/18—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
- B01D21/24—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
-
- 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
- B01D21/2433—Discharge mechanisms for floating particles
-
- 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
-
- 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
- B01D21/34—Controlling the feed distribution; Controlling the liquid level ; Control of process parameters
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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
- B01D21/0003—Making of sedimentation devices, structural details thereof, e.g. prefabricated parts
Definitions
- the present invention relates to a sedimentation apparatus for coagulating and precipitating suspended solids or the like in a liquid to be treated within a sedimentation tank, so as to clarify the liquid.
- Coagulating sedimentation apparatus are a kind of sedimentation type water treatment apparatus, which flocculate suspended solids or the like contained in a liquid to be treated such as raw wastewater by coagulating it with an appropriate additive, thereby eliminating the suspended solids from the liquid by sedimentation operation.
- the sedimentation apparatus described in the publication includes a tubular mixing chamber for coagulating the suspended solids or the like by mixing the liquid to be treated with an additive.
- the mixing chamber is disposed in an upright state within a sedimentation tank at the center thereof.
- a distributor is disposed at the lower end of the mixing chamber, by which the liquid to be treated having coagulated flocs is distributed into the inner space within the tank.
- the inner space excludes the space within the mixing chamber, hereinafter referred to as “sedimentation space”.
- a distributor developed in recent years is basically constituted by a cup-shaped rotary support, connected to a lower portion of a center shaft disposed within the mixing chamber concentrically therewith, functioning as a bottom of the mixing chamber; a plurality of discharge pipes radially extending from the outer peripheral surface of the rotary support; and a driving device for rotating the center shaft.
- the center shaft When the center shaft is rotated, the floc-containing liquid to be treated is discharged from discharge orifices of the individual discharge pipes and is evenly distributed into the sedimentation space within the sedimentation tank.
- the coagulated floc in the liquid is separated by sedimentation operation and forms a concentrated sludge layer at the bottom region of the tank.
- clear supernatants ascend to the upper region of the tank, and a very clear supernatant near the liquid surface is collected by a trough disposed at the upper region of the tank and is taken out of the tank through an outlet communicating with this trough.
- the above-mentioned conventional sedimentation apparatus can efficiently yield clarified supernatants and are used for various purposes, e.g., for treating wastewater, collecting papermaking white water, and so forth.
- sedimentation apparatus of this type have come into wider uses the following problems have been noticed.
- the liquid to be treated is continuously introduced into an upper portion of the mixing chamber through a conduit; whereas the liquid within the mixing chamber is discharged from the rotating distributor below the mixing chamber. Meanwhile, the liquid within the mixing chamber contains particles having a relatively high specific gravity, and suspended solids or the like which coagulates and forms bulky flocs within a short period of time under the action of an additive.
- the particles and flocs may sediment within the mixing chamber to directly accumulate within the rotary support of the distributor, which functions as the bottom of the mixing chamber, before flowing into the discharge pipes from the mixing chamber. If sludge or the like accumulates within the rotary support or the bottom of the mixing chamber, the discharge pipe inlets in the distributor may be blocked. If the discharge pipe inlets are blocked, then the liquid to be treated cannot efficiently be distributed into the sedimentation space in the tank, whereby clarity of supernatants may deteriorate.
- the present invention provides a coagulating sedimentation apparatus for precipitating and separating suspended solids, coagulated flocs or the like in a liquid to be treated, so as to clarify the liquid
- the sedimentation apparatus comprising: a sedimentation tank; a mixing chamber disposed in an upright state within the tank concentrically therewith, for introducing, stirring and mixing the liquid and an additive therein; a cup-shaped rotary support disposed adjacent a lower end part of the mixing chamber so as to act as a bottom of the mixing chamber, the rotary support being adapted to rotate about a center axis of the mixing chamber and having a bottom portion formed with an opening; a discharge pipe extending outward from an outer peripheral surface of the rotary support, communicating with the inside of the rotary support, and having a tubular wall provided with a discharge orifice, for distributing the liquid within the mixing chamber into a precipitation space between the tank and the mixing chamber; and a blade fixed with respect to the mixing chamber and adapted
- Various liquids to be treated in the sedimentation apparatus include particles having a relatively heavy weight, and suspended solids or the like which coagulates within a short period of time under the action of an additive, thereby forming bulky flocs.
- the particles and bulky flocs or the like may separating within the mixing chamber, thereby precipitating at the bottom of the rotary support without flowing into the discharge pipe of the distributor.
- the bottom portion of the rotary support in this sedimentation apparatus is formed with an opening, whereas a scraping blade is fixed with respect to the mixing chamber.
- the rotary support rotates relative to the mixing chamber, whereby the scraping blade fixed to the mixing chamber pivots with respect to the rotary support.
- the precipitate deposited on the bottom of the rotary support during the operation of the sedimentation apparatus is scraped into the opening by the scraping blade, and is discharged into the tank by way of the opening.
- the inlet of the discharge pipe is prevented from being blocked, so that the liquid to be treated is always efficiently distributed into the tank.
- the operating performance of the sedimentation apparatus improves, and the clarity of supernatants also increases.
- FIG. 1 is a vertical sectional view showing a sedimentation apparatus in accordance with the present invention
- FIG. 2 is an enlarged partial sectional view showing the vicinity of a connecting part between a mixing chamber and a conduit for introducing a liquid to be treated;
- FIG. 3 is a sectional view taken along the line III-III in FIG. 2;
- FIG. 4 is an enlarged partial sectional view showing the vicinity of a connecting part between the mixing chamber and a rotary support;
- FIG. 5 is a sectional view taken along the line V-v in FIG. 4;
- FIG. 6 is a sectional view taken along the line VI-VI in FIG. 1;
- FIG. 7 is an enlarged partial sectional view showing the vicinity of a connecting part between the mixing chamber and rotary support in another embodiment in accordance with the present invention.
- FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. 7.
- FIG. 1 there is shown vertical sectional view of a coagulating sedimentation apparatus in accordance with the present invention, being generally designated by numeral 10 .
- the sedimentation apparatus 10 is of a type comprising a sedimentation tank 12 adapted to separate suspended solids and floes from a liquid to be treated such as row wastewater by sedimentation operation and take out a clarified supernatant as a treated liquid; and a mixing chamber 14 , disposed therewithin, for coagulating the suspended solids and the like in the liquid and flocculating them.
- Such a sedimentation apparatus 10 is capable of so-called sludge blanket type operation and slurry circulation type operation, and can be employed for various purposes, e.g., for treating wastewater, collecting papermaking white water, collecting DIP wastewater, clarifying caustic green liquor, treating water, treatment for precipitating and washing inorganic substances, and the like.
- the sedimentation tank 12 has a depth of about 4000 to 5000 mm and a diameter of about 1500 to 30000 mm, which are set arbitrarily according to the space for installing the tank 12 and the property, amount and etc. of the liquid to be treated.
- the sedimentation tank 12 is constructed by a base 16 made of concrete or the like disposed in the area for installing the sedimentation apparatus 10 and a side wall 18 , fixed thereon, which is made of a steel plate.
- a frame 20 bridges over the upper edge portion of the tank side wall 18 .
- the frame 20 is mainly used as a service space for operators.
- the mixing chamber 14 is vertically suspended from the center portion of the frame 20 .
- the mixing chamber 14 is substantially shaped like an elongated cylinder and has, for example, a total length of about 2 ⁇ 3 of the depth of the sedimentation tank 12 .
- the mixing chamber 14 is fixed to the frame 20 such that its center axis aligns with that of the sedimentation tank 12 .
- the mixing chamber 14 is secured within the sedimentation tank 12 in an upright state, while a predetermined gap or space is formed between the lower end of the mixing chamber 14 and the bottom surface of the sedimentation tank 12 .
- a liquid inlet pipe 22 extends from a pump (not shown) disposed outside the sedimentation tank 12 .
- a conduit 24 for introducing the liquid to be treated is connected to the upper portion of the mixing chamber 14 , and communicates with the liquid inlet pipe 22 .
- the position at which the conduit 24 and the mixing chamber 14 connect with each other is lower than the liquid surface in the sedimentation space within the tank 12 and the liquid surface within the mixing chamber 14 during the operation.
- a receiving chamber 26 directly communicating with the liquid introducing conduit 24 is disposed.
- the receiving chamber 26 is defined by an annular member 28 made of an annular flat plate and a tubular member 30 .
- the annular member 28 forms the bottom part of the receiving chamber 26
- the tubular member 30 forms the side wall part of the receiving chamber 26 .
- a space for receiving the target liquid is defined among the annular member 28 , the tubular member 30 and the inner peripheral surface of the mixing chamber 14 .
- the sizes of the annular member 28 and tubular member 30 are set such that the volume of this space is necessary and sufficient.
- the annular member 28 is secured on the inner peripheral face of the mixing chamber 14 so as to be positioned lower than the conduit 24 .
- the upper edge portion of the tubular member 30 fixed to the inner peripheral edge of the annular member 28 is positioned higher than the conduit 24 .
- an overflow stopper 32 is disposed between the inner peripheral face of the mixing chamber 14 and the upper edge portion of the tubular member 30 . Consequently, even when the flow rate of the liquid flowing from the conduit 24 into the receiving chamber 26 is high, the liquid can be prevented from immediately spilling out of the receiving chamber 26 in the vicinity of the conduit 24 .
- a tubular body 36 of a mixer device 34 which will be explained later, can be installed inside the tubular member 30 . This arrangement aims at effectively utilizing the space within the mixing chamber 14 .
- the liquid flowing out of the conduit 24 circulates through the receiving chamber 26 and then flows into the mixing chamber 14 .
- the amount of precipitate at the bottom of the mixing chamber 14 can effectively be reduced as compared with the case without the receiving chamber 26 .
- the amount of precipitate on the bottom part 28 of the receiving chamber 26 may be so much that the outlet 38 of the conduit 24 may be blocked in some cases.
- the annular member 28 is formed with discharge ports 40 for discharging the precipitate deposited within the receiving chamber 26 into the mixing chamber 14 .
- the discharge ports 40 are disposed at four places in total at 90° intervals.
- the total area of the discharge ports 40 (the total of the individual areas of discharge ports 40 ) is preferably 1 ⁇ 4 to 1 ⁇ 2 of the area of the chamber bottom part 28 . This can prevent the liquid having flowed into the receiving chamber 26 from flowing into the mixing chamber 14 in excess from the discharge ports 40 , and also can prevent the discharge ports 40 from being blocked with the precipitate.
- their opening width is preferably set to 30 mm or greater.
- annular member 28 is provided with the discharge ports 40 , then particles having a high specific gravity, bulky flocs, and the like contained in the liquid to be treated within the receiving chamber 26 will sediment into the mixing chamber 14 by way of the discharge ports 40 , and the precipitate on the annular member 28 will be discharged into the mixing chamber 14 by way of the discharge ports 40 due to the flow within the receiving chamber 26 . As a consequence, there will occur no troubles such as the blocking of the outlet 38 of the conduit 24 .
- the mixing chamber 14 is provided with a plurality of injection nozzles 42 for injecting various additives which coagulate suspended solids and the like in the liquid to be treated and form flocs. While a high-molecular coagulant is employed as an additive to be introduced into the mixture chamber 14 , it is appropriately selected depending on the liquid to be treated and the materials contained therein as a matter of course.
- the individual injection nozzles 42 are disposed along the vertical axis of the mixing chamber 14 . In this embodiment, a pair of injection nozzles 42 are disposed in each of the upper, middle, and lower stages of the mixing chamber 14 .
- Each injection nozzle is connected to a pump 46 by way of a header 44 supported by an appropriate supports for example, such as the frame 20 , whereas a tank 48 containing an additive is connected to the suction port of the pump 46 . Therefore, when the pump 46 is driven, the additive will be injected into the mixing chamber 14 from the tank 48 by way of the injection nozzles 42 . The amount of injection of the additive is controllable for each injection nozzle 42 .
- the mixing chamber incorporates therein the mixer device 34 for mixing and stirring the liquid to be treated and the additive.
- the mixer device 34 is constituted by the hollow tubular body 36 vertically hung from the frame 20 with an upper end portion thereof rotatably supported in the frame 20 so as to be concentric with the mixing chamber 14 , and a plurality of blades 50 attached to the outer peripheral face thereof. Also, at the time of operation of the sedimentation apparatus 10 , the mixer tubular body 36 is rotated by a driving device 52 mounted on the frame 20 .
- a center shaft 54 is inserted through the mixer tubular body 36 .
- the center shaft 54 is also rotatably hung from the frame 20 while in a state disposed concentric with the mixing chamber 14 , and is rotated by a driving device 56 mounted on the frame 20 .
- the center shaft 54 vertically extends to a sludge drain recess 58 disposed at the center part of the concrete base 16 .
- a plurality of members 60 for suppressing axial fluctuations of the center shaft 54 are fixed to the lower end part of the mixer tubular body 36 , for example, at 90° intervals.
- the portion of center shaft 54 adjacent the lower end of the mixing chamber 14 is provided with a distributor 62 for distributing the liquid in the mixing chamber 14 into the sedimentation tank 12 .
- the distributor 62 is basically constituted by a cup-shaped rotary support 64 concentrically fixed to the center shaft 54 and disposed so as to close the lower end portion of the mixing chamber 14 , and a plurality of discharge pipes 66 communicating with the inside of the rotary support 64 and horizontally extending radially outward from the outer peripheral surface of the rotary support 64 .
- Each discharge pipe 66 is formed with a row of a plurality of discharge orifices 68 along the longitudinal axis thereof.
- the distributor 62 is rotated by the driving device 56 together with the center shaft 54 , whereby the liquid containing coagulated flocs within the mixing chamber 14 is discharged and distributed into the sedimentation tank 12 while drawing a circle from the discharge orifices of the discharge pipes 66 .
- a sealing unit 70 is disposed between the gap between the mixing chamber 14 and the rotary support 64 .
- the sealing unit 70 is constituted by a twofold sheet-like packing 72 fixed to the flange portion formed at the lower edge of the mixing chamber 14 , such that the packing 72 slides against the outer peripheral surface of the upper portion of the rotary support 64 . This prevents the liquid from being discharged or taking a shortcut directly into the sedimentation space within the tank 12 .
- a molded packing having a P-shaped cross section may be used in place of the packing 72 , and the sealing unit 70 may also be constituted as a gland packing or mechanical seal.
- the rotary support 64 of the distributor 62 functions as the bottom of the mixing chamber 14 . Consequently, particles having a relatively high specific gravity, bulky flocs, and the like in the liquid to be treated may sediment within the mixing chamber 14 and accumulate on the bottom surface of the rotary support 64 without flowing into the discharge pipes 66 .
- the particles having a high specific gravity and the bulky flocs include those having flowed out of the receiving chamber 26 into the mixing chamber 14 .
- the bulky flocs further include suspended solids and the like coagulated within a short period of time upon addition of the additive into the liquid.
- the bottom of the rotary support 64 is formed with an opening 74 for discharging the precipitate such as sludge into the sedimentation space within the tank 12 .
- one opening 74 is disposed in the vicinity of the center shaft 54 .
- the mixing chamber 14 is formed with a scraping blade 76 for scraping the precipitate deposited on the bottom surface of the rotary support 64 into the opening 74 and discharging it into the sedimentation space therefrom.
- an attachment block 78 is fixed to the inner peripheral surface of the lower portion of the mixing chamber 14
- the upper end of a support member 80 made of an angle steel or the like is fixed to the attachment block 78 with the aid of a bolt or the like.
- the support member 80 extends in parallel with the center shaft 54 , i.e., vertically.
- the scraping blade 76 is fixed to the lower end portion of the support member 80 so as to extend inward substantially in a horizontal direction.
- the scraping blade 76 is an angle steel constituted by a pair of planar parts 76 a , 76 b connected to each other at right angles and has substantially an L-shaped cross section.
- One planar part 76 a is substantially parallel to the bottom surface of the rotary support 64 , whereas the other planar part 76 b extends upward in a substantially vertical direction.
- the vertical planar part 76 b is located on the front side in the normal rotating direction of the rotary support 64 (indicated by the arrow of D in FIG. 5).
- the distance between the horizontal planar part 76 a of the scraping blade 76 and the bottom surface of the rotary support 64 is set to about 1 to 50 mm.
- a shortcut preventing member 82 for blocking the flow of the liquid to be treated flowing out into the sedimentation space within the tank 12 through the opening 74 is disposed under the rotary support 64 .
- the shortcut preventing member 82 is shaped like a disk and is fixed to the center shaft 54 such that its outer periphery is located on the outside of the outer edge of the opening 74 . As the center shaft 54 rotates, the shortcut preventing member 82 rotates together with the rotary support 64 .
- baffle plates 84 located under their corresponding discharge pipes 66 of the distributor 62 are attached to the rotary support 64 .
- the liquid discharged from the discharge orifices 68 is deflected by the baffle plates 84 and then is supplied to the lower region of the sedimentation tank 12 , so that the coagulated flocs are restrained from being stirred by the liquid discharged from the distributor 62 , whereby the efficiency of separation by sedimentation further improves in the sedimentation apparatus 10 .
- the discharge pipes 66 are preferably made with a small diameter. If the sedimentation tank 12 has a large diameter, then the number of discharge pipes 66 is preferably increased according to the diameter.
- a rake 86 and a cone scraper 88 which rotate together with the distributor 62 .
- the rake 86 is used for concentrating the sludge formed by sedimented flocs in the liquid discharged from the discharge pipes 66 and scraping the sludge into the sludge drain recess 58 .
- the cone scraper 88 is disposed within the recess 58 .
- the recess 58 communicates with a sludge drain pipe 90 penetrating through the concrete base 16 , whereas the sludge drain pipe 90 is connected to a sludge drain pump 92 and a sludge return pump 94 .
- the sludge drain pump 92 Upon a sludge blanket operation, the sludge drain pump 92 is actuated according to the value indicated by an interface sensor (not shown), so as to discharge the concentrated sludge within the sedimentation tank 12 to the outside of the system, thereby keeping the interface level of the sludge blanket layer within a predetermined range.
- the sludge return pump 94 is actuated according to the value indicated by the interface sensor, so as to appropriately return the sludge into the sedimentation tank 12 .
- annular troughs 96 , 98 Disposed in the upper portion of the sedimentation tank 12 are annular troughs 96 , 98 for collecting the clarified liquid, which is supplied from the distributor 62 into the sedimentation space and increases therein.
- the annular troughs 96 , 98 communicate with a flow outlet 100 formed in the upper portion of the side wall 18 of the sedimentation tank 12 .
- the annular troughs 96 , 98 will be explained in further detail in the following.
- the liquid to be treated such as raw water will be clarified as follows.
- the target liquid such as raw water is supplied to the sedimentation apparatus 10 by way of the inlet pipe 22 .
- the liquid flowing through the inlet pipe 22 by way of the conduit 24 initially flows into the receiving chamber 26 . Subsequently, the liquid circulates through the space defined by the annular member 28 , tubular member 30 , and inner peripheral surface of the mixing chamber 14 , and then spills out into the mixing chamber 14 from the upper portion of the receiving chamber 26 .
- an additive is injected at a given timing from any or all of the injection nozzles 42 disposed as being separated into a plurality of stages. Consequently, the effect caused by the additive continues for a long period of time, and flocs having a favorable sedimentation characteristic are formed.
- the liquid and the additive within the mixing chamber 14 are mixed by the mixer device 34 , whereby suspended solids and the like in the liquid coagulate to form flocs (initial flocs).
- the liquid containing the flocs enters the rotary support 64 driven to rotate by the driving device 56 , and is distributed into the sedimentation tank 12 from the discharge orifices 68 of the discharge pipes 66 .
- one portion of the flow of the liquid descending from the mixing chamber 14 toward the rotary support 64 i.e. the flow about to enter the gap between the mixing chamber 14 and the rotary support 64 is blocked by the sealing unit 70 .
- the liquid containing the coagulated flocs is evenly distributed into the sedimentation space within the tank 12 from the discharge orifices 68 of the discharge pipes 66 .
- the flow of the liquid flowing into the sedimentation space within the tank 12 from the mixing chamber 14 through the opening 74 is blocked by the shortcut preventing member 82 before reaching the concentrated sludge layer A formed below the rotary support 64 .
- the shortcut preventing member 82 rotates together with the rotary support 64 , the precipitate on the shortcut preventing member 82 would sediment in the lower portion of the sedimentation tank 12 gradually and slowly under the action of centrifugal forces.
- the concentrated sludge is drained from the concentrated sludge layer A whenever necessary by the sludge drain pump 92 controlled according to the value indicated by the interface sensor not depicted, whereby the interface height of the sludge blanket layer B is held within a predetermined range.
- fine flocs in the upward flow are captured by large flocs in the sludge blanket layer B, so as to be eliminated from the upward flow.
- the depicted sedimentation apparatus 10 comprises a swirl preventing member 102 formed like a rectangular sheet from a sheet material such as a vinyl-coated nylon sheet or cloth (see FIG. 1)
- the swirl preventing member 102 is spanned between the inner peripheral surface of the sedimentation tank 12 and the outer peripheral surface of the mixing chamber 14 , so as to radially partition the inside of the sedimentation tank 12 . Consequently, if a swirl occurs in the liquid within the sedimentation tank 12 as the distributor 62 rotates, the swirl will collide with the swirl preventing member 102 when ascending within the sedimentation tank 12 .
- each annular trough 96 , 98 has a U-shaped cross section with an open upper portion, such that supernatants flow into the trough 96 , 98 over the upper edge of its vertical part, i.e., weir part.
- the annular troughs 96 , 98 are attached to the sedimentation tank 12 by a plurality of horizontal bars 104 radially extending between the mixing chamber 14 and the side wall 18 of the sedimentation tank 12 .
- the larger-diameter trough 96 and the smaller-diameter trough 98 are communicated to each other by a single U-shaped communicating flow path member 106 radially extending therebetween, whereas the outer end portion of the communicating flow path member 106 opens into the flow outlet 100 .
- the depth of the communicating flow path member 106 be greater than the depth of the annular troughs 96 , 98 .
- the upper edge of the vertical part of the communicating flow path member 106 may have the same height as the upper edge of the weir part of the annular troughs 96 , 98 , so as to allow supernatants to spill out from this portion as well.
- the larger-diameter annular trough 96 is disposed in a state in contact with the inner peripheral surface of the side wall 18 of the tank 12 as with conventional one. As a consequence, supernatants spill out therein only from the weir part 96 a on the center side of the tank 12 .
- the annular trough 96 since the annular trough 96 employs the side wall 18 as its constituent element, the trough itself has an L-shaped form.
- the smaller-diameter annular trough 98 is disposed at a predetermined position between the mixing chamber 14 and the side wall 18 of the sedimentation tank 12 , whereby supernatants spill out therein from both weir parts 98 a , 98 b on the center side and outer side of the tank 12 .
- the upper edges of the weir parts 96 a , 98 a , 98 b into which supernatants spill out may be made linear, it is preferred that V-shaped notches be arranged in the upper edges of the weir parts 96 a , 98 a , 98 b at equally spaced intervals, since it is difficult for the troughs 96 , 98 in total to be arranged horizontally with a high accuracy. As a consequence, if the notch size is adjusted, then supernatants can be evenly spilled out into the whole periphery of the annular trough 96 , 98 .
- D 1 be the inside diameter of the side wall 18 of the sedimentation tank 12
- D 2 be the diameter of the inner weir part 96 a of the larger-diameter annular trough 96
- D 3 and D 4 be the outer weir part 98 b and inner 15 weir part 98 a of the smaller-diameter annular trough 98
- R 1 be the outside diameter of the mixing chamber
- (D 1 ⁇ D 2 )/2 and (D 3 ⁇ D 4 )/2 represent the respective groove widths of the annular troughs 96 , 98 .
- a shortcut preventing member may be disposed within the rotary support 64 .
- a shortcut preventing member 200 is fixed to the center shaft 54 so as to be positioned above the opening 74 formed in the bottom part of the rotary support 64 .
- the flow of the liquid directed to the opening 74 within the mixing chamber 14 is blocked by the shortcut preventing member 200 disposed above the opening 74 .
- a brushing blade 202 for brushing off the precipitate deposited on the shortcut preventing member 200 be provided.
- the upper end of a support member 204 formed from an angle steel or the like is fixed by means of a bolt or the like to the attachment block 78 secured to the inner peripheral face of the mixing chamber 14 .
- the support member 204 faces the support member 80 supporting the scraping blade 76 ; and extends parallel to the center shaft 54 , i.e., vertically.
- the brushing blade 202 is preferably made of an angle material and has substantially an L-shaped cross section.
- the brushing blade 202 is fixed to the lower end part of the support member 204 , whereas its vertically disposed one planer part 202 b is located on the front side in the normal rotating direction D of the rotary support 64 .
- the distance between the horizontal planar part 202 a of the brushing blade 202 and the upper face of the shortcut preventing member 200 is set to about 1 to 50 mm.
- the shortcut preventing member 200 fixed to the center shaft 54 rotates together with the rotary support 64 , whereby the brushing blade 202 secured to the mixing chamber 14 rotates with respect to the shortcut preventing member 200 .
- the precipitate deposited on the shortcut preventing member 200 is brushed off by the brushing blade 202 , so as to flow into the individual discharge pipes 66 .
- the precipitate brushed off by the brushing blade 202 so as to be deposited at the bottom surface of the rotary support 64 is scraped into the opening 74 by the scraping blade 76 and then is discharged into the sedimentation tank 12 by way of the opening 74 . It can easily be understood that the amount of discharge from the opening 74 is quite small due to the existence of the shortcut preventing member 200 and brushing blade 202 .
- the scraping blade 76 is constituted by a single piece of angle steel in the above-mentioned embodiments, its number, form, and attaching position are not limited to those in the above-mentioned embodiments.
- annular troughs 96 , 98 are provided in the above-mentioned embodiments, three or more annular troughs may be disposed concentrically in a large tank. It is also preferred in this case that the sizes and positioning of the individual annular troughs be determined such that their weir parts yield an identical weir overflow load.
- both of the above-mentioned annular troughs have a circular form, they may be shaped like a polygon such as hexagon or octagon in order to facilitate their manufacture. In this case, it will be sufficient if the above-mentioned equation is calculated in terms of their average sizes.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
A sedimentation apparatus for precipitating and separating suspended solids and coagulated flocs in a liquid to be treated, so as to clarify the liquid. The sedimentation apparatus comprises a mixing chamber secured within a sedimentation tank, for mixing and stirring the liquid and an additive; and a rotary support of a distributor, functioning as a bottom of the mixing chamber, rotatable about the center axis of the mixing chamber. The bottom portion of the rotary support is formed with an opening. The sedimentation apparatus has a blade for discharging from the opening the precipitate deposited on the bottom of the rotary support. As a consequence, the precipitate can be prevented from accumulating in excess in the rotary support.
Description
- 1. Field of the Invention
- The present invention relates to a sedimentation apparatus for coagulating and precipitating suspended solids or the like in a liquid to be treated within a sedimentation tank, so as to clarify the liquid.
- 2. Related Background Art
- Coagulating sedimentation apparatus are a kind of sedimentation type water treatment apparatus, which flocculate suspended solids or the like contained in a liquid to be treated such as raw wastewater by coagulating it with an appropriate additive, thereby eliminating the suspended solids from the liquid by sedimentation operation.
- As this kind of sedimentation apparatus, one disclosed in Japanese Patent Publication No. HEI 1-38523 has been known. The sedimentation apparatus described in the publication, includes a tubular mixing chamber for coagulating the suspended solids or the like by mixing the liquid to be treated with an additive. The mixing chamber is disposed in an upright state within a sedimentation tank at the center thereof. Also, a distributor is disposed at the lower end of the mixing chamber, by which the liquid to be treated having coagulated flocs is distributed into the inner space within the tank. In this specification, the inner space excludes the space within the mixing chamber, hereinafter referred to as “sedimentation space”. A distributor developed in recent years is basically constituted by a cup-shaped rotary support, connected to a lower portion of a center shaft disposed within the mixing chamber concentrically therewith, functioning as a bottom of the mixing chamber; a plurality of discharge pipes radially extending from the outer peripheral surface of the rotary support; and a driving device for rotating the center shaft. When the center shaft is rotated, the floc-containing liquid to be treated is discharged from discharge orifices of the individual discharge pipes and is evenly distributed into the sedimentation space within the sedimentation tank.
- In the sedimentation space, the coagulated floc in the liquid is separated by sedimentation operation and forms a concentrated sludge layer at the bottom region of the tank. On the other hand, clear supernatants ascend to the upper region of the tank, and a very clear supernatant near the liquid surface is collected by a trough disposed at the upper region of the tank and is taken out of the tank through an outlet communicating with this trough.
- The above-mentioned conventional sedimentation apparatus can efficiently yield clarified supernatants and are used for various purposes, e.g., for treating wastewater, collecting papermaking white water, and so forth. However, as sedimentation apparatus of this type have come into wider uses the following problems have been noticed.
- In the typical sedimentation apparatus, the liquid to be treated is continuously introduced into an upper portion of the mixing chamber through a conduit; whereas the liquid within the mixing chamber is discharged from the rotating distributor below the mixing chamber. Meanwhile, the liquid within the mixing chamber contains particles having a relatively high specific gravity, and suspended solids or the like which coagulates and forms bulky flocs within a short period of time under the action of an additive.
- As a consequence, the particles and flocs may sediment within the mixing chamber to directly accumulate within the rotary support of the distributor, which functions as the bottom of the mixing chamber, before flowing into the discharge pipes from the mixing chamber. If sludge or the like accumulates within the rotary support or the bottom of the mixing chamber, the discharge pipe inlets in the distributor may be blocked. If the discharge pipe inlets are blocked, then the liquid to be treated cannot efficiently be distributed into the sedimentation space in the tank, whereby clarity of supernatants may deteriorate.
- Therefore, it is an object of the present invention to provide a coagulating sedimentation apparatus having a favorable operating performance and yielding extremely clarified supernatants.
- For achieving the above-mentioned object, the present invention provides a coagulating sedimentation apparatus for precipitating and separating suspended solids, coagulated flocs or the like in a liquid to be treated, so as to clarify the liquid, the sedimentation apparatus comprising: a sedimentation tank; a mixing chamber disposed in an upright state within the tank concentrically therewith, for introducing, stirring and mixing the liquid and an additive therein; a cup-shaped rotary support disposed adjacent a lower end part of the mixing chamber so as to act as a bottom of the mixing chamber, the rotary support being adapted to rotate about a center axis of the mixing chamber and having a bottom portion formed with an opening; a discharge pipe extending outward from an outer peripheral surface of the rotary support, communicating with the inside of the rotary support, and having a tubular wall provided with a discharge orifice, for distributing the liquid within the mixing chamber into a precipitation space between the tank and the mixing chamber; and a blade fixed with respect to the mixing chamber and adapted to discharge a precipitate deposited on the bottom portion of the rotary support from the opening to the outside of the rotary support.
- Various liquids to be treated in the sedimentation apparatus include particles having a relatively heavy weight, and suspended solids or the like which coagulates within a short period of time under the action of an additive, thereby forming bulky flocs. As a consequence, the particles and bulky flocs or the like may separating within the mixing chamber, thereby precipitating at the bottom of the rotary support without flowing into the discharge pipe of the distributor. In view of this point, the bottom portion of the rotary support in this sedimentation apparatus is formed with an opening, whereas a scraping blade is fixed with respect to the mixing chamber.
- Namely, during the operation of the sedimentation apparatus, the rotary support rotates relative to the mixing chamber, whereby the scraping blade fixed to the mixing chamber pivots with respect to the rotary support. As a consequence, the precipitate deposited on the bottom of the rotary support during the operation of the sedimentation apparatus is scraped into the opening by the scraping blade, and is discharged into the tank by way of the opening. As a result, the inlet of the discharge pipe is prevented from being blocked, so that the liquid to be treated is always efficiently distributed into the tank. Hence, the operating performance of the sedimentation apparatus improves, and the clarity of supernatants also increases.
- The present invention will be more fully understood from the detailed description given hereinbelow and the attached drawings, which are given by way of illustration only and are not to be considered as limiting the present invention.
- Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will be apparent to those skilled in the art from this detailed description.
- In the course of the following detailed description, reference will be made to the attached drawings in which:
- FIG. 1 is a vertical sectional view showing a sedimentation apparatus in accordance with the present invention;
- FIG. 2 is an enlarged partial sectional view showing the vicinity of a connecting part between a mixing chamber and a conduit for introducing a liquid to be treated;
- FIG. 3 is a sectional view taken along the line III-III in FIG. 2;
- FIG. 4 is an enlarged partial sectional view showing the vicinity of a connecting part between the mixing chamber and a rotary support;
- FIG. 5 is a sectional view taken along the line V-v in FIG. 4;
- FIG. 6 is a sectional view taken along the line VI-VI in FIG. 1;
- FIG. 7 is an enlarged partial sectional view showing the vicinity of a connecting part between the mixing chamber and rotary support in another embodiment in accordance with the present invention; and
- FIG. 8 is a sectional view taken along the line VIII-VIII in FIG. 7.
- Referring now to the drawings, and particularly, to FIG. 1, there is shown vertical sectional view of a coagulating sedimentation apparatus in accordance with the present invention, being generally designated by
numeral 10. Thesedimentation apparatus 10 is of a type comprising asedimentation tank 12 adapted to separate suspended solids and floes from a liquid to be treated such as row wastewater by sedimentation operation and take out a clarified supernatant as a treated liquid; and amixing chamber 14, disposed therewithin, for coagulating the suspended solids and the like in the liquid and flocculating them. Such asedimentation apparatus 10 is capable of so-called sludge blanket type operation and slurry circulation type operation, and can be employed for various purposes, e.g., for treating wastewater, collecting papermaking white water, collecting DIP wastewater, clarifying caustic green liquor, treating water, treatment for precipitating and washing inorganic substances, and the like. - The
sedimentation tank 12 has a depth of about 4000 to 5000 mm and a diameter of about 1500 to 30000 mm, which are set arbitrarily according to the space for installing thetank 12 and the property, amount and etc. of the liquid to be treated. Thesedimentation tank 12 is constructed by abase 16 made of concrete or the like disposed in the area for installing thesedimentation apparatus 10 and aside wall 18, fixed thereon, which is made of a steel plate. - A
frame 20 bridges over the upper edge portion of thetank side wall 18. Theframe 20 is mainly used as a service space for operators. Themixing chamber 14 is vertically suspended from the center portion of theframe 20. Themixing chamber 14 is substantially shaped like an elongated cylinder and has, for example, a total length of about ⅔ of the depth of thesedimentation tank 12. Themixing chamber 14 is fixed to theframe 20 such that its center axis aligns with that of thesedimentation tank 12. As a consequence, themixing chamber 14 is secured within thesedimentation tank 12 in an upright state, while a predetermined gap or space is formed between the lower end of themixing chamber 14 and the bottom surface of thesedimentation tank 12. - A
liquid inlet pipe 22 extends from a pump (not shown) disposed outside thesedimentation tank 12. Aconduit 24 for introducing the liquid to be treated is connected to the upper portion of themixing chamber 14, and communicates with theliquid inlet pipe 22. The position at which theconduit 24 and themixing chamber 14 connect with each other is lower than the liquid surface in the sedimentation space within thetank 12 and the liquid surface within themixing chamber 14 during the operation. - Within the
mixing chamber 14, as shown in FIG. 2, areceiving chamber 26 directly communicating with theliquid introducing conduit 24 is disposed. Thereceiving chamber 26 is defined by anannular member 28 made of an annular flat plate and atubular member 30. Theannular member 28 forms the bottom part of thereceiving chamber 26, whereas thetubular member 30 forms the side wall part of thereceiving chamber 26. - A space for receiving the target liquid is defined among the
annular member 28, thetubular member 30 and the inner peripheral surface of the mixingchamber 14. The sizes of theannular member 28 andtubular member 30 are set such that the volume of this space is necessary and sufficient. Also, theannular member 28 is secured on the inner peripheral face of the mixingchamber 14 so as to be positioned lower than theconduit 24. Further, the upper edge portion of thetubular member 30 fixed to the inner peripheral edge of theannular member 28 is positioned higher than theconduit 24. As a consequence, when flowing into the mixingchamber 14, the liquid to be treated reliably circulates through the receivingchamber 26 at first. - In addition, in the vicinity of the
conduit 24, anoverflow stopper 32 is disposed between the inner peripheral face of the mixingchamber 14 and the upper edge portion of thetubular member 30. Consequently, even when the flow rate of the liquid flowing from theconduit 24 into the receivingchamber 26 is high, the liquid can be prevented from immediately spilling out of the receivingchamber 26 in the vicinity of theconduit 24. Here, as shown in FIGS. 2 and 3, atubular body 36 of amixer device 34, which will be explained later, can be installed inside thetubular member 30. This arrangement aims at effectively utilizing the space within the mixingchamber 14. - Thus, when the receiving
chamber 26 is disposed within the mixingchamber 14, the liquid flowing out of theconduit 24 circulates through the receivingchamber 26 and then flows into the mixingchamber 14. As a result, even if the liquid introduced into the mixingchamber 14 contains particles having a relatively high specific gravity, bulky flocs, and the like, the amount of precipitate at the bottom of the mixingchamber 14 can effectively be reduced as compared with the case without the receivingchamber 26. - Depending on the property of the liquid to be treated and the like, however, the amount of precipitate on the
bottom part 28 of the receivingchamber 26 may be so much that theoutlet 38 of theconduit 24 may be blocked in some cases. - Hence, as clearly shown in FIG. 3, the
annular member 28 is formed withdischarge ports 40 for discharging the precipitate deposited within the receivingchamber 26 into the mixingchamber 14. In the shown embodiment, thedischarge ports 40 are disposed at four places in total at 90° intervals. In this case, the total area of the discharge ports 40 (the total of the individual areas of discharge ports 40) is preferably ¼ to ½ of the area of the chamberbottom part 28. This can prevent the liquid having flowed into the receivingchamber 26 from flowing into the mixingchamber 14 in excess from thedischarge ports 40, and also can prevent thedischarge ports 40 from being blocked with the precipitate. For preventing thedischarge ports 40 from being blocked with the precipitate, their opening width (indicated by W in FIG. 3) is preferably set to 30 mm or greater. - If the
annular member 28 is provided with thedischarge ports 40, then particles having a high specific gravity, bulky flocs, and the like contained in the liquid to be treated within the receivingchamber 26 will sediment into the mixingchamber 14 by way of thedischarge ports 40, and the precipitate on theannular member 28 will be discharged into the mixingchamber 14 by way of thedischarge ports 40 due to the flow within the receivingchamber 26. As a consequence, there will occur no troubles such as the blocking of theoutlet 38 of theconduit 24. - Referring to FIG. 1 again, the mixing
chamber 14 is provided with a plurality ofinjection nozzles 42 for injecting various additives which coagulate suspended solids and the like in the liquid to be treated and form flocs. While a high-molecular coagulant is employed as an additive to be introduced into themixture chamber 14, it is appropriately selected depending on the liquid to be treated and the materials contained therein as a matter of course. Theindividual injection nozzles 42 are disposed along the vertical axis of the mixingchamber 14. In this embodiment, a pair ofinjection nozzles 42 are disposed in each of the upper, middle, and lower stages of the mixingchamber 14. Each injection nozzle is connected to apump 46 by way of aheader 44 supported by an appropriate supports for example, such as theframe 20, whereas atank 48 containing an additive is connected to the suction port of thepump 46. Therefore, when thepump 46 is driven, the additive will be injected into the mixingchamber 14 from thetank 48 by way of theinjection nozzles 42. The amount of injection of the additive is controllable for eachinjection nozzle 42. - Further, as shown in FIG. 1, the mixing chamber incorporates therein the
mixer device 34 for mixing and stirring the liquid to be treated and the additive. Themixer device 34 is constituted by the hollowtubular body 36 vertically hung from theframe 20 with an upper end portion thereof rotatably supported in theframe 20 so as to be concentric with the mixingchamber 14, and a plurality ofblades 50 attached to the outer peripheral face thereof. Also, at the time of operation of thesedimentation apparatus 10, themixer tubular body 36 is rotated by a drivingdevice 52 mounted on theframe 20. - A
center shaft 54 is inserted through themixer tubular body 36. Thecenter shaft 54 is also rotatably hung from theframe 20 while in a state disposed concentric with the mixingchamber 14, and is rotated by a drivingdevice 56 mounted on theframe 20. Thecenter shaft 54 vertically extends to asludge drain recess 58 disposed at the center part of theconcrete base 16. Also, as clearly shown in FIG. 4, a plurality ofmembers 60 for suppressing axial fluctuations of thecenter shaft 54 are fixed to the lower end part of themixer tubular body 36, for example, at 90° intervals. - The portion of
center shaft 54 adjacent the lower end of the mixingchamber 14 is provided with adistributor 62 for distributing the liquid in the mixingchamber 14 into thesedimentation tank 12. As can be understood from FIG. 4, thedistributor 62 is basically constituted by a cup-shapedrotary support 64 concentrically fixed to thecenter shaft 54 and disposed so as to close the lower end portion of the mixingchamber 14, and a plurality ofdischarge pipes 66 communicating with the inside of therotary support 64 and horizontally extending radially outward from the outer peripheral surface of therotary support 64. Eachdischarge pipe 66 is formed with a row of a plurality ofdischarge orifices 68 along the longitudinal axis thereof. At the time of operation of thesedimentation apparatus 10, thedistributor 62 is rotated by the drivingdevice 56 together with thecenter shaft 54, whereby the liquid containing coagulated flocs within the mixingchamber 14 is discharged and distributed into thesedimentation tank 12 while drawing a circle from the discharge orifices of thedischarge pipes 66. - A sealing
unit 70 is disposed between the gap between the mixingchamber 14 and therotary support 64. The sealingunit 70 is constituted by a twofold sheet-like packing 72 fixed to the flange portion formed at the lower edge of the mixingchamber 14, such that the packing 72 slides against the outer peripheral surface of the upper portion of therotary support 64. This prevents the liquid from being discharged or taking a shortcut directly into the sedimentation space within thetank 12. As a matter of course, a molded packing having a P-shaped cross section may be used in place of the packing 72, and the sealingunit 70 may also be constituted as a gland packing or mechanical seal. - The
rotary support 64 of thedistributor 62 functions as the bottom of the mixingchamber 14. Consequently, particles having a relatively high specific gravity, bulky flocs, and the like in the liquid to be treated may sediment within the mixingchamber 14 and accumulate on the bottom surface of therotary support 64 without flowing into thedischarge pipes 66. Here, the particles having a high specific gravity and the bulky flocs include those having flowed out of the receivingchamber 26 into the mixingchamber 14. The bulky flocs further include suspended solids and the like coagulated within a short period of time upon addition of the additive into the liquid. If sludge and the like precipitate on the bottom surface of therotary support 64 in excess as such, then there is a possibility of the precipitate entering between thecenter shaft 54 and themembers 60 for suppressing the axial fluctuations, thereby wearing and damaging thecenter shaft 54 and themembers 60 or blocking thedischarge pipes 66. - In view of this points as shown in FIG. 5, the bottom of the
rotary support 64 is formed with anopening 74 for discharging the precipitate such as sludge into the sedimentation space within thetank 12. In the depictedsedimentation apparatus 10, oneopening 74 is disposed in the vicinity of thecenter shaft 54. - Also, as shown in FIGS. 4 and 5, the mixing
chamber 14 is formed with ascraping blade 76 for scraping the precipitate deposited on the bottom surface of therotary support 64 into theopening 74 and discharging it into the sedimentation space therefrom. More specifically, anattachment block 78 is fixed to the inner peripheral surface of the lower portion of the mixingchamber 14, whereas the upper end of asupport member 80 made of an angle steel or the like is fixed to theattachment block 78 with the aid of a bolt or the like. Thesupport member 80 extends in parallel with thecenter shaft 54, i.e., vertically. Thescraping blade 76 is fixed to the lower end portion of thesupport member 80 so as to extend inward substantially in a horizontal direction. Thescraping blade 76 is an angle steel constituted by a pair ofplanar parts planar part 76 a is substantially parallel to the bottom surface of therotary support 64, whereas the otherplanar part 76 b extends upward in a substantially vertical direction. Also, the verticalplanar part 76 b is located on the front side in the normal rotating direction of the rotary support 64 (indicated by the arrow of D in FIG. 5). Preferably, the distance between the horizontalplanar part 76 a of thescraping blade 76 and the bottom surface of therotary support 64 is set to about 1 to 50 mm. - Here, when a line which is substantially parallel to the
scraping blade 76 and radially extends from the center of thecenter shaft 54 is arbitrarily chosen and set as a specific radius R1, thescraping blade 76 as a whole is disposed so as to be positioned parallel to the radius R1 and on the reverse direction side of therotary support 64 from the radius R1. Since thescraping blade 76 is disposed as such, a centripetal force (directed to the center shaft 54) would act on the precipitate in contact with the verticalplanar part 76 b of thescraping blade 76. As a consequence, when thescraping blade 76 rotates with respect to therotary support 64, then the precipitate will be scraped by thescraping blade 76 toward thecenter shaft 54. - Within the
sedimentation tank 12, ashortcut preventing member 82 for blocking the flow of the liquid to be treated flowing out into the sedimentation space within thetank 12 through theopening 74 is disposed under therotary support 64. As shown in FIGS. 4 and 5, theshortcut preventing member 82 is shaped like a disk and is fixed to thecenter shaft 54 such that its outer periphery is located on the outside of the outer edge of theopening 74. As thecenter shaft 54 rotates, theshortcut preventing member 82 rotates together with therotary support 64. - Returning to FIG. 1,
baffle plates 84 located under theircorresponding discharge pipes 66 of thedistributor 62 are attached to therotary support 64. As a consequence, the liquid discharged from the discharge orifices 68 is deflected by thebaffle plates 84 and then is supplied to the lower region of thesedimentation tank 12, so that the coagulated flocs are restrained from being stirred by the liquid discharged from thedistributor 62, whereby the efficiency of separation by sedimentation further improves in thesedimentation apparatus 10. Here, since there is a risk of swirls occurring in excess within thesedimentation tank 12 if the diameter of thedischarge pipes 66 is too large, thedischarge pipes 66 are preferably made with a small diameter. If thesedimentation tank 12 has a large diameter, then the number ofdischarge pipes 66 is preferably increased according to the diameter. - Further attached to the lower end portion of the
center shaft 54 are arake 86 and acone scraper 88 which rotate together with thedistributor 62. Therake 86 is used for concentrating the sludge formed by sedimented flocs in the liquid discharged from thedischarge pipes 66 and scraping the sludge into thesludge drain recess 58. Thecone scraper 88 is disposed within therecess 58. Therecess 58 communicates with asludge drain pipe 90 penetrating through theconcrete base 16, whereas thesludge drain pipe 90 is connected to asludge drain pump 92 and asludge return pump 94. Upon a sludge blanket operation, thesludge drain pump 92 is actuated according to the value indicated by an interface sensor (not shown), so as to discharge the concentrated sludge within thesedimentation tank 12 to the outside of the system, thereby keeping the interface level of the sludge blanket layer within a predetermined range. Here, since thecone scraper 88 is rotating, the concentrated sludge within thesedimentation tank 12 is discharged evenly. Upon a slurry circulation operation, on the other hand, thesludge return pump 94 is actuated according to the value indicated by the interface sensor, so as to appropriately return the sludge into thesedimentation tank 12. - Disposed in the upper portion of the
sedimentation tank 12 areannular troughs distributor 62 into the sedimentation space and increases therein. In the shown embodiment, there are twoannular troughs annular troughs flow outlet 100 formed in the upper portion of theside wall 18 of thesedimentation tank 12. Theannular troughs - With the foregoing arrangement, the liquid to be treated such as raw water will be clarified as follows.
- The target liquid such as raw water is supplied to the
sedimentation apparatus 10 by way of theinlet pipe 22. The liquid flowing through theinlet pipe 22 by way of theconduit 24 initially flows into the receivingchamber 26. Subsequently, the liquid circulates through the space defined by theannular member 28,tubular member 30, and inner peripheral surface of the mixingchamber 14, and then spills out into the mixingchamber 14 from the upper portion of the receivingchamber 26. - This can effectively restrain particles having a high specific gravity, bulky flocs, and the like from sedimenting within the mixing
chamber 14 and thereby precipitating on the bottom of therotary support 64 of thedistributor 62 as compared with the case where the liquid is directly introduced into the mixingchamber 14 from theconduit 24. As a result, the inlets ofdischarge pipes 66 in thedistributor 62 are kept from being blocked, so that the liquid is always efficiently distributed into the sedimentation space within thetank 12, whereby the operating performance of thesedimentation apparatus 10 improves. - With respect to the liquid having flowed into the mixing
chamber 14 from the receivingchamber 26, an additive is injected at a given timing from any or all of theinjection nozzles 42 disposed as being separated into a plurality of stages. Consequently, the effect caused by the additive continues for a long period of time, and flocs having a favorable sedimentation characteristic are formed. The liquid and the additive within the mixingchamber 14 are mixed by themixer device 34, whereby suspended solids and the like in the liquid coagulate to form flocs (initial flocs). - The liquid containing the flocs enters the
rotary support 64 driven to rotate by the drivingdevice 56, and is distributed into thesedimentation tank 12 from thedischarge orifices 68 of thedischarge pipes 66. Here, one portion of the flow of the liquid descending from the mixingchamber 14 toward therotary support 64, i.e. the flow about to enter the gap between the mixingchamber 14 and therotary support 64 is blocked by the sealingunit 70. The liquid containing the coagulated flocs is evenly distributed into the sedimentation space within thetank 12 from thedischarge orifices 68 of thedischarge pipes 66. Also, since the increase in the liquid within the sedimentation space is collected by theannular troughs sedimentation tank 12, an upward flow of the liquid occurs within thetank 12, thereby forming a sludge blanket layer B above thedistributor 62 in the case of sludge blanket type operation. Among the coagulated flocs in the liquid, those separated by sedimentation operation within thetank 12 form a concentrated sludge layer A in the bottom portion of thesedimentation tank 12 with the aid of therake 86. - Within the mixing
chamber 14, a part of particles, bulky flocs, and the like sediment, and precipitate on the bottom of therotary support 64 without flowing into eachdischarge pipe 66. During the operation of thesedimentation apparatus 10, therotary support 64 rotates relative to the mixingchamber 14, whereby thescraping blade 76 fixed to the mixingchamber 14 would rotate with respect to therotary support 64. As a consequence, the precipitate deposited on the bottom surface of therotary support 64 during the operation of thesedimentation apparatus 10 is scraped into theopening 74 by thescraping blade 76 and is discharged into thetank 12 by way of theopening 74. - As a result, sludge would not precipitate in excess on the bottom surface of the
rotary support 64, so that troubles caused by the precipitate within therotary support 64 such as the blocking of the inlets ofdischarge pipes 66 in thedistributor 62 are kept from occurring, whereby the liquid to be treated is always efficiently distributed into thesedimentation tank 12. Consequently, the operating performance of thesedimentation apparatus 10 improves, and the clarity of supernatants also increases. - Also, the flow of the liquid flowing into the sedimentation space within the
tank 12 from the mixingchamber 14 through theopening 74 is blocked by theshortcut preventing member 82 before reaching the concentrated sludge layer A formed below therotary support 64. Similarly, not only the sludge, bulky flocs, and the like in the liquid flowing out of theopening 74, but also the precipitate, such as sludge, discharged into the sedimentation space from theopening 74 with the aid of thescraping blade 76 is held by theshortcut preventing member 82 disposed under therotary support 64. Since theshortcut preventing member 82 rotates together with therotary support 64, the precipitate on theshortcut preventing member 82 would sediment in the lower portion of thesedimentation tank 12 gradually and slowly under the action of centrifugal forces. - This prevents so-called shortcut phenomenon, in which the liquid flowing into the sedimentation space through the
opening 74 directly reaches the concentrated sludge layer A, from occurring and the coagulated flocs and concentrated sludge layer A from being diluted or stirred by the precipitates discharged into thesedimentation tank 12 from therotary support 64, whereby the clarity of supernatants can be maintained favorably. - The concentrated sludge is drained from the concentrated sludge layer A whenever necessary by the
sludge drain pump 92 controlled according to the value indicated by the interface sensor not depicted, whereby the interface height of the sludge blanket layer B is held within a predetermined range. On the other hand, fine flocs in the upward flow are captured by large flocs in the sludge blanket layer B, so as to be eliminated from the upward flow. - The depicted
sedimentation apparatus 10 comprises aswirl preventing member 102 formed like a rectangular sheet from a sheet material such as a vinyl-coated nylon sheet or cloth (see FIG. 1) Theswirl preventing member 102 is spanned between the inner peripheral surface of thesedimentation tank 12 and the outer peripheral surface of the mixingchamber 14, so as to radially partition the inside of thesedimentation tank 12. Consequently, if a swirl occurs in the liquid within thesedimentation tank 12 as thedistributor 62 rotates, the swirl will collide with theswirl preventing member 102 when ascending within thesedimentation tank 12. Therefore, fine coagulating flocs are restrained from rolling up in the region higher than thedistributor 62 but lower than the clarified liquid surface within thesedimentation tank 12, whereby the floating particle concentration in supernatants can be lowered to a desirable level. Hence, very clear supernatants ascend within thesedimentation tank 12, thereby forming a clarified layer C. Then, the supernatants spill out as a treated liquid into theannular troughs flow outlet 100. - The configuration of the
annular troughs annular trough trough annular troughs annular troughs sedimentation tank 12 by a plurality ofhorizontal bars 104 radially extending between the mixingchamber 14 and theside wall 18 of thesedimentation tank 12. Also, the larger-diameter trough 96 and the smaller-diameter trough 98 are communicated to each other by a single U-shaped communicatingflow path member 106 radially extending therebetween, whereas the outer end portion of the communicatingflow path member 106 opens into theflow outlet 100. For smoothly introducing the collected liquid into theflow outlet 100, it is preferred that the depth of the communicatingflow path member 106 be greater than the depth of theannular troughs flow path member 106 may have the same height as the upper edge of the weir part of theannular troughs - The larger-diameter
annular trough 96 is disposed in a state in contact with the inner peripheral surface of theside wall 18 of thetank 12 as with conventional one. As a consequence, supernatants spill out therein only from theweir part 96 a on the center side of thetank 12. In the depicted embodiment, since theannular trough 96 employs theside wall 18 as its constituent element, the trough itself has an L-shaped form. On the other hand, the smaller-diameterannular trough 98 is disposed at a predetermined position between the mixingchamber 14 and theside wall 18 of thesedimentation tank 12, whereby supernatants spill out therein from bothweir parts tank 12. - Though the upper edges of the
weir parts weir parts troughs annular trough - When one
annular trough 98 is additionally disposed inside the outerannular trough 96 as such, then the upward flow in the vicinity of thesidewall 18 of thesedimentation tank 12 is kept from becoming faster than the upward flow on the center side of thesedimentation tank 12. Namely, supernatants also flow into theannular trough 98 installed on the center side of thetank 12, so that the flow rate of the upward flow on the center side of thesedimentation tank 12 approximates the flow rate of the upward flow in the vicinity of theside wall 18 of thesedimentation tank 12, thereby yielding more even upward flows in total. - The optimal positions and widths of
annular troughs weir parts annular troughs sedimentation tank 12 become the most uniform if the weir overflow load is the same in theindividual weir parts - Here, letting D1 be the inside diameter of the
side wall 18 of thesedimentation tank 12, D2 be the diameter of theinner weir part 96 a of the larger-diameterannular trough 96, D3 and D4 be theouter weir part 98 b and inner 15weir part 98 a of the smaller-diameterannular trough 98, and R1 be the outside diameter of the mixing chamber, the optimal relationship mentioned above can be represented by the following expression. - As a matter of course, (D1−D2)/2 and (D3−D4)/2 represent the respective groove widths of the
annular troughs - When the
annular troughs sedimentation tank 12 become more even, so as to improve the effect of separation by sedimentation, whereby very clear supernatants can be collected. - Though a preferred embodiment of the present invention has been explained in detail in the foregoing, the present invention is not restricted to the above-mentioned embodiment as a matter of course.
- For example, a shortcut preventing member may be disposed within the
rotary support 64. Namely, in the embodiment shown in FIGS. 7 and 8, ashortcut preventing member 200 is fixed to thecenter shaft 54 so as to be positioned above theopening 74 formed in the bottom part of therotary support 64. As a consequence, the flow of the liquid directed to theopening 74 within the mixingchamber 14 is blocked by theshortcut preventing member 200 disposed above theopening 74. This resultantly prevents so-called shortcut phenomenon, in which the liquid flowing into thesedimentation tank 12 through theopening 74 directly reaches the concentrated sludge layer or the like, from occurring and the coagulated flocs and concentrated sludge layer from being diluted or stirred by the precipitate and the like discharged into thesedimentation tank 12 from therotary support 64, whereby the clarity of supernatants can be maintained favorably. - By the way, sludge, bulky flocs, and the like may deposit on the
shortcut preventing member 200 disposed above theopening 74. In view of this, it is preferred that abrushing blade 202 for brushing off the precipitate deposited on theshortcut preventing member 200 be provided. Namely, the upper end of asupport member 204 formed from an angle steel or the like is fixed by means of a bolt or the like to theattachment block 78 secured to the inner peripheral face of the mixingchamber 14. Across theattachment block 78, thesupport member 204 faces thesupport member 80 supporting thescraping blade 76; and extends parallel to thecenter shaft 54, i.e., vertically. - The
brushing blade 202 is preferably made of an angle material and has substantially an L-shaped cross section. Thebrushing blade 202 is fixed to the lower end part of thesupport member 204, whereas its vertically disposed oneplaner part 202 b is located on the front side in the normal rotating direction D of therotary support 64. Preferably, the distance between the horizontalplanar part 202 a of thebrushing blade 202 and the upper face of theshortcut preventing member 200 is set to about 1 to 50 mm. - Now, when a line which is substantially parallel to the
brushing blade 202 and radially extends from the center of thecenter shaft 54 is set as a specific radius R1 with respect to therotary support 64, thebrushing blade 202 as a whole is arranged so as to be positioned on the normal direction side of therotary support 64 from the radius R1. Since thebrushing blade 202 is arranged as such, a centrifugal force (directed to the inner peripheral face of the mixing chamber 14) would act on the precipitate in contact with the verticalplanar part 202 b of thebrushing blade 202. As a consequence, if thebrushing blade 202 rotates with respect to therotary support 64, then the precipitate will be scraped by thebrushing blade 202 toward the inner peripheral face of the mixingchamber 14. - During the operation of the sedimentation apparatus, the
shortcut preventing member 200 fixed to thecenter shaft 54 rotates together with therotary support 64, whereby thebrushing blade 202 secured to the mixingchamber 14 rotates with respect to theshortcut preventing member 200. As a consequence, the precipitate deposited on theshortcut preventing member 200 is brushed off by thebrushing blade 202, so as to flow into theindividual discharge pipes 66. Also, the precipitate brushed off by thebrushing blade 202 so as to be deposited at the bottom surface of therotary support 64 is scraped into theopening 74 by thescraping blade 76 and then is discharged into thesedimentation tank 12 by way of theopening 74. It can easily be understood that the amount of discharge from theopening 74 is quite small due to the existence of theshortcut preventing member 200 and brushingblade 202. - Though the
scraping blade 76 is constituted by a single piece of angle steel in the above-mentioned embodiments, its number, form, and attaching position are not limited to those in the above-mentioned embodiments. - Though only two
annular troughs - Further, though both of the above-mentioned annular troughs have a circular form, they may be shaped like a polygon such as hexagon or octagon in order to facilitate their manufacture. In this case, it will be sufficient if the above-mentioned equation is calculated in terms of their average sizes.
- From the invention thus described, it will be obvious that the invention may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended for inclusion within the scope of the following claims.
Claims (14)
1. A coagulating sedimentation apparatus for precipitating and separating suspended solids, coagulated flocs or the like in a liquid to be treated, so as to clarify said liquid, said sedimentation apparatus comprising:
a sedimentation tank;
a mixing chamber vertically disposed within said tank concentrically therewith, for introducing and mixing said liquid and an additive therein;
a cup-shaped rotary support disposed adjacent a lower end of said mixing chamber so as to act as a bottom of said mixing chamber, said rotary support being rotated about a center axis of said mixing chamber and having a bottom portion formed with an opening;
a discharge pipe extending outward from an outer peripheral surface of said rotary support, communicating with the inside of said rotary support, and having a tubular wall provided with a discharge orifice, said discharge pipe being for distributing said liquid from said mixing chamber into a sedimentation space between said tank and said mixing chamber; and
a blade fixed with respect to said mixing chamber and adapted to discharge a precipitate deposited on the bottom portion of said rotary support from said opening to the outside of said rotary support.
2. A coagulating sedimentation apparatus according to claim 1 , further comprising:
a mixer device disposed within said mixing chamber and adapted to rotate about the center axis of said mixing chamber, for mixing and stirring said liquid and additive; and
a center shaft disposed so as to penetrate through said mixer device and adapted to rotate about the center axis of said mixing chamber,
said rotary support fixed to said center shaft. rotary support.
3. A coagulating sedimentation apparatus according to claim 1 , further comprising a shortcut preventing member disposed under said opening and adapted to rotate together with said rotary support, for blocking a flow of said liquid flowing out through said opening from said mixing chamber and rotary support.
4. A coagulating sedimentation apparatus according to claim 1 , further comprising:
a shortcut preventing member disposed above said opening and adapted to rotate together with said rotary support, for blocking a flow of said liquid directed from said mixing chamber toward said opening; and
a blade fixed with respect to said mixing chamber, for brushing off a precipitate deposited on said shortcut preventing member.
5. A coagulating sedimentation apparatus according to claim 1 , further comprising:
a conduit connected to said mixing chamber, for introducing said liquid into said mixing chamber; and
a receiving chamber formed along an inner peripheral surface of said mixing chamber, for receiving said liquid from said conduit and causing said liquid to flow from said receiving chamber into said mixing chamber.
6. A coagulating sedimentation apparatus according to claim 5 , wherein said receiving chamber is defined by the inner peripheral surface of said mixing chamber, an annular member fixed to the inner peripheral face of said mixing chamber, and a tubular member fixed to an inner edge of said annular member.
7. A coagulating sedimentation apparatus according to claim 6 , wherein said annular member is positioned lower than said conduit, and wherein said tubular member has an upper edge positioned higher than said conduit.
8. A coagulating sedimentation apparatus according to claim 5 , wherein said receiving chamber has a bottom portion formed with a discharge port for discharging a precipitate deposited within said receiving chamber.
9. A coagulating sedimentation apparatus according to claim 8 , wherein said discharge port has a total area which is ¼ to ½ of the area of the bottom surface of said receiving chamber.
10. A coagulating sedimentation apparatus according to claim 1 , further comprising a plurality of annular troughs concentrically arranged in an upper portion of said tank.
11. A coagulating sedimentation apparatus according to claim 10 , wherein said plurality of annular troughs are positioned and dimensioned such that weir parts of all said plurality of annular troughs into which a supernatant in said sedimentation space within said tank spills out have a substantially identical overflow liquid load.
12. A coagulating sedimentation apparatus according to claim 10 , wherein said plurality of annular troughs comprise an annular trough with a larger diameter disposed along a side wall of said tank, and an annular trough with a smaller diameter disposed in an intermediate portion between said side wall of said tank and said mixing chamber.
13. A coagulating sedimentation apparatus according to claim 12 , wherein said plurality of annular troughs are positioned and dimensioned so as to satisfy the following expression:
where D1 is the inside diameter of the side wall of the tank, D2 is the inside diameter of the inner weir part of the annular trough with a larger diameter, D3 is the outside diameter of the outer weir part of the annular trough with a smaller diameter, and D4 is the inside diameter of the inner weir part of the annular trough with a smaller diameter, and R1 is the outside diameter of the mixing chamber.
14. A coagulating sedimentation apparatus according to claim 1 , further comprising a member secured to a mixer device, for supporting a center shaft.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/986,924 US20020056678A1 (en) | 1999-04-06 | 2001-11-13 | Coagulating sedimentation apparatus |
Applications Claiming Priority (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP105228/2000 | 1999-04-06 | ||
JP152629/1999 | 1999-05-31 | ||
JP15262999A JP3310629B2 (en) | 1999-05-31 | 1999-05-31 | Coagulation sedimentation equipment |
JP199134/1999 | 1999-07-13 | ||
JP19913499A JP3557129B2 (en) | 1999-07-13 | 1999-07-13 | Coagulation sedimentation equipment |
JP2000105228A JP4223651B2 (en) | 2000-04-06 | 2000-04-06 | Coagulation sedimentation equipment |
US09/583,919 US6334952B1 (en) | 1999-05-31 | 2000-05-31 | Coagulating sedimentation apparatus |
US09/986,924 US20020056678A1 (en) | 1999-04-06 | 2001-11-13 | Coagulating sedimentation apparatus |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/583,919 Division US6334952B1 (en) | 1999-04-06 | 2000-05-31 | Coagulating sedimentation apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
US20020056678A1 true US20020056678A1 (en) | 2002-05-16 |
Family
ID=27320311
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/583,919 Expired - Lifetime US6334952B1 (en) | 1999-04-06 | 2000-05-31 | Coagulating sedimentation apparatus |
US09/986,924 Abandoned US20020056678A1 (en) | 1999-04-06 | 2001-11-13 | Coagulating sedimentation apparatus |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/583,919 Expired - Lifetime US6334952B1 (en) | 1999-04-06 | 2000-05-31 | Coagulating sedimentation apparatus |
Country Status (5)
Country | Link |
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US (2) | US6334952B1 (en) |
EP (1) | EP1057510B1 (en) |
AT (1) | ATE303191T1 (en) |
DE (1) | DE60022264T2 (en) |
DK (1) | DK1057510T3 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CN104797316A (en) * | 2012-11-20 | 2015-07-22 | 栗田工业株式会社 | Distributor, settling tank and method for operating same |
CN112811548A (en) * | 2021-01-22 | 2021-05-18 | 北京华德创业环保设备有限公司 | Rotational flow flocculation device and sedimentation tank with same |
WO2021257101A1 (en) * | 2020-06-19 | 2021-12-23 | Adalberto Mercado Alvarado | Liquid polymer or chemical activation system using a submersible actuator |
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US6881349B2 (en) * | 2002-11-15 | 2005-04-19 | M-I Llc | Method for recycling of oil based drilling fluid contaminated with water and water contaminated with oil based drilling fluid |
FI122057B (en) * | 2006-10-30 | 2011-08-15 | Outotec Oyj | Thickening and thickening procedure |
WO2009137865A1 (en) * | 2008-05-15 | 2009-11-19 | Outotec Oyj | Improvements in feedwells |
JP5799940B2 (en) * | 2012-11-20 | 2015-10-28 | 栗田工業株式会社 | Precipitation tank and its operation method |
US10040004B2 (en) | 2014-09-25 | 2018-08-07 | ClearCove Systems, Inc. | Method for mixing industrial waste water within a gravity settling tank |
US10040697B2 (en) | 2015-09-11 | 2018-08-07 | ClearCove Systems, Inc. | Method for mixing industrial waste water within a gravity settling tank |
SE541161C2 (en) | 2017-11-17 | 2019-04-23 | Valmet Oy | Green liquor clarification using sedimentation tank during white liquor preparation |
FR3081167B1 (en) * | 2018-05-17 | 2020-06-12 | IFP Energies Nouvelles | DEVICE FOR LIMITING VORTEX AND SOLID DEPOSITS |
CN110152360A (en) * | 2019-07-04 | 2019-08-23 | 青岛伊克斯达智能装备有限公司 | The cracked oil and carbon black separator and its separation method of waste tire thermal cracking |
CN110844991B (en) * | 2019-11-12 | 2023-09-01 | 苏州仕净科技股份有限公司 | Industrial wastewater treatment equipment |
CN111603811B (en) * | 2020-07-01 | 2023-06-30 | 长沙矿山研究院有限责任公司 | Feeding box for thickener and using method thereof |
CN114733235A (en) * | 2022-04-25 | 2022-07-12 | 战美钰 | Alcohol precipitation equipment and process for Ganmaoling granules |
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US2348123A (en) * | 1940-09-13 | 1944-05-02 | Infilco Inc | Treatment of liquid |
US2787378A (en) * | 1952-05-26 | 1957-04-02 | Everett M Battey | Slurry type liquid treating apparatus |
BE525460A (en) * | 1953-11-16 | |||
US3525439A (en) * | 1968-11-04 | 1970-08-25 | Franklin K Spragins | Distribution and slurrying apparatus |
US3521755A (en) * | 1968-11-26 | 1970-07-28 | Cities Service Athabasca Inc | Separating apparatus |
US4278541A (en) * | 1978-03-14 | 1981-07-14 | Amstar Corporation | Separator employing an annular vertical feedwell with associated concentric annular baffle plate and method of using same to separate solids from liquids |
US4303517A (en) * | 1979-01-15 | 1981-12-01 | Sydlo Inc. | Liquid treatment apparatus |
JPS58174209A (en) | 1982-04-01 | 1983-10-13 | Sumitomo Jukikai Envirotec Kk | Treating device by flocculating sedimentation |
JPH0743136B2 (en) | 1987-07-31 | 1995-05-15 | 株式会社日立製作所 | Turbulent premixed burner that reduces nitrogen oxides by reducing combustion |
TW242566B (en) * | 1993-09-10 | 1995-03-11 | Sumitomo Heavy Industry |
-
2000
- 2000-05-30 DK DK00111543T patent/DK1057510T3/en active
- 2000-05-30 AT AT00111543T patent/ATE303191T1/en not_active IP Right Cessation
- 2000-05-30 DE DE60022264T patent/DE60022264T2/en not_active Expired - Lifetime
- 2000-05-30 EP EP00111543A patent/EP1057510B1/en not_active Expired - Lifetime
- 2000-05-31 US US09/583,919 patent/US6334952B1/en not_active Expired - Lifetime
-
2001
- 2001-11-13 US US09/986,924 patent/US20020056678A1/en not_active Abandoned
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104797316A (en) * | 2012-11-20 | 2015-07-22 | 栗田工业株式会社 | Distributor, settling tank and method for operating same |
WO2021257101A1 (en) * | 2020-06-19 | 2021-12-23 | Adalberto Mercado Alvarado | Liquid polymer or chemical activation system using a submersible actuator |
GB2611460A (en) * | 2020-06-19 | 2023-04-05 | Mercado Alvarado Adalberto | Liquid polymer or chemical activation system using a submersible actuator |
CN112811548A (en) * | 2021-01-22 | 2021-05-18 | 北京华德创业环保设备有限公司 | Rotational flow flocculation device and sedimentation tank with same |
Also Published As
Publication number | Publication date |
---|---|
EP1057510B1 (en) | 2005-08-31 |
DE60022264T2 (en) | 2006-06-22 |
DE60022264D1 (en) | 2005-10-06 |
DK1057510T3 (en) | 2005-11-07 |
ATE303191T1 (en) | 2005-09-15 |
US6334952B1 (en) | 2002-01-01 |
EP1057510A1 (en) | 2000-12-06 |
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Legal Events
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