WO2020031567A1 - Dispositif de floculation et de sédimentation et sont procédé de démarrage - Google Patents

Dispositif de floculation et de sédimentation et sont procédé de démarrage Download PDF

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Publication number
WO2020031567A1
WO2020031567A1 PCT/JP2019/026497 JP2019026497W WO2020031567A1 WO 2020031567 A1 WO2020031567 A1 WO 2020031567A1 JP 2019026497 W JP2019026497 W JP 2019026497W WO 2020031567 A1 WO2020031567 A1 WO 2020031567A1
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WIPO (PCT)
Prior art keywords
coagulation
tank
sedimentation
sludge
cyclone
Prior art date
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PCT/JP2019/026497
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English (en)
Japanese (ja)
Inventor
田中　一平
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栗田工業株式会社
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Priority to KR1020217000420A priority Critical patent/KR20210035801A/ko
Publication of WO2020031567A1 publication Critical patent/WO2020031567A1/fr

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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
    • B01D21/01—Separation of suspended solid particles from liquids by sedimentation using flocculating agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/02—Settling tanks with single outlets for the separated liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/02—Settling tanks with single outlets for the separated liquid
    • B01D21/04—Settling tanks with single outlets for the separated liquid with moving scrapers
    • B01D21/06—Settling tanks with single outlets for the separated liquid with moving scrapers with rotating scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/02—Settling tanks with single outlets for the separated liquid
    • B01D21/08—Settling tanks with single outlets for the separated liquid provided with flocculating compartments
    • 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
    • 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
    • B01D21/26—Separation of sediment aided by centrifugal force or centripetal force
    • 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
    • B01D21/26—Separation of sediment aided by centrifugal force or centripetal force
    • B01D21/267—Separation of sediment aided by centrifugal force or centripetal force by using a cyclone
    • 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
    • B01D21/28—Mechanical auxiliary equipment for acceleration of sedimentation, e.g. by vibrators or the like
    • B01D21/286—Means for gentle agitation for enhancing flocculation
    • 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
    • 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
    • B01D21/305—Control of chemical properties of a component, e.g. control of pH
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5209—Regulation methods for flocculation or precipitation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5227—Processes for facilitating the dissolution of solid flocculants in water

Definitions

  • the present invention relates to a coagulation sedimentation apparatus for adding a sedimentation promoting agent and a coagulant to raw water containing a suspended substance to cause coagulation and sedimentation to separate sludge and treated water, and a control method therefor.
  • the present invention particularly relates to a coagulation and sedimentation apparatus configured to separate a slurry extracted from a sedimentation tank into sludge and a sedimentation promoting material by a cyclone, and to return the sedimentation promoting material to the coagulation tank, and a method of starting the same.
  • a coagulation sedimentation device that separates and removes suspended substances (hereinafter sometimes referred to as SS [Suspended ⁇ Solid] ⁇ ) from raw water by coagulation and sedimentation.
  • a flocculation tank for forming flocculated floc by adding a sedimentation promoting material and a flocculant; a sedimentation tank for sedimenting and separating flocculated floc flowing out of the flocculation tank; and a cyclone for separating the slurry drawn out from the sedimentation tank into particulate matter and sludge.
  • Patent Documents 1 to 3 There are known devices that are configured to return granular materials to a coagulation tank and discharge sludge.
  • the inorganic coagulant is added to the raw water introduced into the coagulation tank, the mixture is stirred with a stirrer, then the polymer coagulant is added, and the mixture is stirred with a stirrer to obtain a granular material.
  • Agglomerated flocs are formed together with (sand etc.).
  • the coagulated water is introduced into a sedimentation tank to separate it by sedimentation, and the treated water flows out from the upper part of the sedimentation tank. Further, the slurry is extracted from the lower part of the settling tank by a pump and sent to a cyclone.
  • the slurry is centrifuged into sludge and particulate matter, and the separated sludge is discharged out of the coagulation settling apparatus.
  • the particulate matter separated by the cyclone is returned to the flocculation tank and reused for sedimentation.
  • a flow control valve is provided in a sludge return line for returning at least a part of the sludge discharged from the cyclone to the flocculation tank, and when the SS concentration of the raw water is low, the sludge return amount is increased, and the SS concentration is increased. It is described that control is performed so as to reduce the sludge return amount when the value is high (paragraph 0072).
  • the tanks of the industrial sedimentation equipment should be used when the equipment is started or when the equipment is restarted after maintenance. Is not filled with water.
  • the coagulated sedimentation layer is portable, drain water from each tank and extract the sedimentation promoting material during non-rainfall.
  • water is poured into each tank of the coagulation sedimentation apparatus, and then operation is resumed by receiving drainage from the yard (hereinafter referred to as yard drainage).
  • the water in each tank (water in the tank) has a remarkably low SS concentration
  • the yard wastewater flows into the coagulation sedimentation device at the beginning of rainfall, the yard wastewater is diluted with the water in the tank.
  • the SS concentration in the tank is low.
  • SS concentration is not sufficient because it is not concentrated. Therefore, the concentration of sludge discharged from the coagulation sedimentation device becomes low.
  • the extraction from the sedimentation tank may be intermittently operated in order to promote the concentration of SS.
  • the sedimentation promoting material when the sedimentation promoting material is contained in the sludge as in the present invention, the sedimentation promoting material accumulates in the bottom pit of the sedimentation tank or in the drawing line, and there is a concern that the sedimentation promoting material is fixed. is there.
  • the present invention prevents the discharge of low-concentration sludge at the time of startup of a portable coagulation sedimentation device or a coagulation sedimentation device in which water to be treated flows into a coagulation sedimentation device in a state where water is filled in each coagulation tank. It is an object of the present invention to provide a coagulating sedimentation apparatus capable of shortening the start-up time by increasing the SS concentration and a method for starting the same.
  • the coagulation and sedimentation apparatus of the present invention has a first coagulation tank into which raw water is introduced and performs coagulation treatment with a first coagulation agent, and a first coagulation treatment water discharged from the first coagulation tank, and a second coagulation agent.
  • the sludge circulation line is connected to the first coagulation tank, and the coagulation and sedimentation device has switching means for switching between the sludge circulation line and the sludge discharge line.
  • a control means for controlling the switching means so as to be connected to a line or branched to the sludge discharge line and the sludge circulation line to discharge at least part of the separated sludge from the cyclone continuously or intermittently out of the system. It is characterized by having.
  • control means an SS meter provided in the separated sludge line or the sludge circulation line, and the separated sludge from the cyclone until the detected SS concentration of the SS meter rises to a predetermined concentration.
  • the amount of the first coagulant added to the first coagulation tank and the amount of the first coagulant added to the second coagulation tank are at least part of the time until the SS concentration detected by the SS meter rises to a predetermined concentration.
  • a coagulant addition amount control unit for increasing the addition amount of the second coagulant is provided.
  • the switching unit is controlled to return the separated sludge from the cyclone to the first coagulation tank for a predetermined time after starting supply of raw water to the first coagulation tank. It has a timer.
  • the amount of the first coagulant added to the first coagulation tank and the second coagulation agent are added to the first coagulation tank during at least a part of a period after the start of the supply of the raw water to the first coagulation tank until a predetermined time elapses.
  • a coagulant addition amount control unit for increasing the amount of the second coagulant added to the coagulation tank is provided.
  • a raw water is introduced, a first coagulation tank for coagulation treatment with a first coagulant, and a first coagulation treatment water discharged from the first coagulation tank are introduced.
  • a second coagulation tank for coagulating with a coagulant and a sedimentation promoting material a sedimentation tank into which second coagulation treatment water discharged from the second coagulation tank is introduced, and sedimented and separated into treated water and slurry;
  • a cyclone for returning the separated sedimentation promoting material to the second flocculation tank, wherein the separated sludge line from the cyclone sludge outlet is a sludge discharge line and a sludge discharge line.
  • a method for activating a coagulation sedimentation device which is branched into a circulation line and the sludge circulation line is connected to the first coagulation tank.
  • the coagulation / sedimentation device When the coagulation / sedimentation device is started, the separated sludge from the cyclone is passed through the sludge circulation line. No. It returned to flocculation tank, after start end of the aggregated precipitate device and switches to continuously or intermittently out of the system discharging at least a portion of the separated sludge from the cyclone.
  • the amount of the first coagulant added to the first coagulation tank and the amount of the second coagulant added to the second coagulation tank are increased when the coagulation settling apparatus is started.
  • the raw water is yard drainage.
  • the separated sludge discharged from the cyclone is returned to the first flocculation tank when the flocculation and settling apparatus is started, so that the low-concentration sludge is prevented from being discharged.
  • the SS concentration in the system increases at an early stage, and the start-up time is shortened.
  • the coagulation action is enhanced by increasing the amount of the first coagulant added when the coagulation and sedimentation apparatus is started, and the discharge of low-concentration sludge is prevented. Further, by increasing the amount of the second coagulant to be added to the first coagulant, insufficient coagulation can be prevented.
  • FIG. 1 shows a coagulation-sedimentation apparatus 1 according to a first embodiment.
  • This coagulation-sedimentation apparatus 1 includes a first coagulation tank 2, a second coagulation tank 3, and a sedimentation tank 4 disposed adjacent to the first coagulation tank 2.
  • Raw water is introduced into the first flocculation tank 2 through a raw water introduction line 5, an inorganic flocculant (PAC in FIG. 1) is added as a first flocculant by a first chemical injection device 6, and stirred by a stirrer 7. Is done.
  • the inorganic flocculant flocculates the suspended substance to generate fine flocs.
  • the first coagulation tank 2 is provided with a pH meter and a pH adjuster (caustic soda, sulfuric acid, hydrochloric acid, etc.), and maintains the pH in the first coagulation tank 2 within a predetermined range. It is configured to be able to.
  • the first coagulation treatment water from the first coagulation tank 2 is introduced into the second coagulation tank 3 through the advection port 8, and a polymer coagulant (polymer) is added as a second coagulant by the second chemical infusion device 9.
  • a sedimentation promoting material such as sand is added to the second flocculation tank 3, and fine floc is taken into the sedimentation promoting material via the polymer flocculant by stirring by the stirrer 10, and the flocculation floc having a large specific gravity is added. To grow.
  • crushed slag can be used as a sedimentation promoting material.
  • the average particle size of the sedimentation promoting material is preferably about 0.01 to 0.5 mm, and the true specific gravity is preferably 2 or more, particularly 2.5 or more and 4 or less, but is not limited thereto.
  • the second flocculated water containing the flocculated floc that has grown flows over the overflow weir 12 and is introduced into the sedimentation tank 4.
  • the second flocculated water descends along the weir plate of the overflow weir 12, then rises, passes through the separator, and flows into the outflow chamber 15.
  • flocculated flocs in the second flocculated water are precipitated.
  • a separator composed of a plurality of inclined plates 13 is provided at the upper part in the sedimentation tank 4 to promote sedimentation and separation of flocculated flocs.
  • the treated water that has passed through the separator is taken out of the outflow pipe 16 through the outflow chamber 15.
  • a rake 14 is provided in the settling tank 4.
  • a drawing line 17 for extracting a slurry containing precipitated flocculated flocs is connected to the bottom of the settling tank 4.
  • a drawing pump 18 is provided to the cyclone 20 for drawing the slurry.
  • the cyclone 20 is installed such that the axial direction is a vertical direction.
  • the sent slurry is separated by centrifugation into sludge collected at the axis of the cyclone and sedimentation promoting material collected at the peripheral surface on the cyclone side.
  • the separated sedimentation promoting material is returned from the bottom of the cyclone 20 to the second flocculation tank 3 again by the pipe 19 and is used for circulation.
  • the separated sludge collected on the axis side in the cyclone 20 flows out to a pipe 21 (separated sludge line) connected to a sludge outlet at the center of the upper surface of the cyclone 20.
  • the pipe 21 branches into pipes 22 and 25.
  • Pipe 22 is connected to pipe 24 via valve 23.
  • a sludge discharge line is constituted by the pipes 22, 24 and the valve 23.
  • the pipe 25 can return the separated sludge to the first flocculation tank 2 via the valve 26 and the pipe 27.
  • a sludge circulation line is constituted by the pipes 25 and 27 and the valve 26.
  • the valves 23 and 26 constitute switching means.
  • An SS meter 28 such as an optical turbidity meter is installed in the pipe 27, and the detection signal is input to the controller 30.
  • the valves 23 and 26 are controlled by the controller 30 to switch ON / OFF or adjust the flow rate.
  • fresh water having relatively high clarity such as clean water, well water, river water, rain water, and purified water is filled in each of the tanks 2, 3, and 4 to a specified water level. . This is to check whether the tanks 2 to 4 and the members are damaged.
  • the raw water mixes with the fresh water in the first flocculation tank 2, is diluted and subjected to flocculation treatment, flows into the sedimentation tank 4 via the second flocculation tank 3, sedimentation and separation of flocculated floc, and the treated water (clear water) ) Is discharged from the pipe 16.
  • the SS concentration in each of the coagulation tanks 2 and 3 is low.
  • the SS concentration of the precipitated slurry is also low. Therefore, the SS concentration of the separated sludge separated by the cyclone 20 is low, and it is not appropriate to discharge the sludge as it is.
  • valve 23 is closed and the valve 26 is opened when the coagulation and sedimentation apparatus 1 is started, and the entire amount of the separated sludge from the cyclone 20 is returned from the pipe 27 to the first coagulation tank 2.
  • the SS concentration of the separated sludge flowing in the pipe 27 is measured by the SS meter 28, and the detection signal is input to the controller 30.
  • the controller 30 controls the valve 23 until the SS concentration detected by the SS meter 28 reaches a preset predetermined concentration (in the case of the coagulation sedimentation apparatus for treating yard wastewater, about 10 to 50 g / L, particularly about 15 to 30 g / L). Is closed and the valve 26 is opened to return the entire amount of the separated sludge to the first flocculation tank 2.
  • the controller 30 opens the valve 23 and closes the valve 26, and discharges the entire amount of the separated sludge from the cyclone 20 from the pipe 24.
  • the entire amount of sludge is discharged from the pipe 24, but a part of the separated sludge from the cyclone 20 is discharged from the pipe 27 to the first pipe 27. It may be returned to the coagulation tank 2. Further, the separation sludge may be discharged intermittently instead of continuously.
  • the amount of the coagulant added by the first and second chemical infusion devices 6 and 9 is fixed (quantitative addition method).
  • the SS concentration of the raw water may be detected, and the added amount of the flocculant may be controlled according to the detection result.
  • FIG. 2 shows an aggregating and settling apparatus 1A according to a second embodiment.
  • the controller 30 is configured to control the first and second chemical injection devices 6 and 9 as described later.
  • Other configurations of the coagulation and sedimentation apparatus 1A are the same as those of the coagulation and sedimentation apparatus 1, and the same reference numerals indicate the same parts.
  • the controller 30 controls opening and closing of the valves 23 and 26 according to the same starting method as in the first embodiment until the detected concentration of the SS meter 28 rises to a predetermined value when the coagulating sedimentation apparatus 1A is started. .
  • the controller 30 further controls the inorganic coagulant and the polymer by the first and second dispensing devices 6 and 9 until the concentration detected by the SS meter 28 increases to a predetermined value.
  • the addition amount of the flocculant is larger than the standard addition amount during the steady operation (for example, 1.5 to 5 times the standard addition amount, particularly 2 to 5 times the standard addition amount).
  • the aggregation effect in the first and second aggregation tanks 2 and 3 is increased, and the SS concentration of the slurry precipitated in the precipitation tank 4 is increased.
  • the concentration of sludge separated by the cyclone 20 quickly increases to a predetermined value.
  • FIG. 3 shows a coagulation-sedimentation apparatus 1B according to a third embodiment.
  • a timer 31 is provided instead of the controller 30 to control the opening and closing of the valves 23 and 26. Also, the SS meter 28 is omitted.
  • Other configurations are the same as those of the coagulation and sedimentation apparatus 1 of FIG. 1, and the same reference numerals indicate the same parts.
  • the valve 26 is opened and the valve 23 is closed until a predetermined time has elapsed from the start of the flow of raw water into the coagulation and sedimentation device 1B when the coagulation and sedimentation device 1B is started.
  • the entire amount of the separated sludge is returned to the first flocculation tank 2.
  • the valve 26 is closed and the valve 23 is opened, and the entire amount of the separated sludge from the cyclone 20 is discharged from the pipe 24.
  • a part of the separated sludge from the cyclone 20 may be returned to the first flocculation tank 2 from the pipe 27, or may be intermittent treatment instead of continuous treatment.
  • the predetermined time is preferably about 0.5 to 4 times the HRT of the coagulation sedimentation apparatus 1B.
  • the SS concentration of the slurry precipitated in the precipitation tank 4 increases early.
  • the concentration of sludge separated by the cyclone 20 increases early.
  • FIG. 4 shows a coagulating sedimentation apparatus 1C according to a fourth embodiment.
  • the coagulation and sedimentation device 1C includes a timer 31 as in the coagulation and sedimentation device 1B of FIG. 3, and further includes a controller 32 that controls the amount of coagulant added by the first and second chemical injection devices 6, 9. I have.
  • the timer 31 opens the valve 26 and closes the valve 23 until a predetermined time elapses from the start of inflow of raw water into the coagulation and sedimentation apparatus 1C (start of operation of the raw water pump), similarly to the coagulation and sedimentation apparatus 1B of FIG.
  • the entire amount of the separated sludge from the cyclone 20 is returned to the first flocculation tank 2.
  • the valve 26 is closed and the valve 23 is opened, and the entire amount of the separated sludge from the cyclone 20 is discharged from the pipe 24.
  • a part of the separated sludge from the cyclone 20 may be returned to the first flocculation tank 2 from the pipe 27, or may be intermittent treatment instead of continuous treatment.
  • the controller 32 controls the inorganic coagulant and the polymer by the first and second chemical injection devices 6 and 9 until a predetermined time elapses from the start of the coagulation and sedimentation device 1C (start of the timer 31 (start of operation of the raw water pump)).
  • the addition amount of the flocculant is made larger than the standard addition amount in the steady operation (for example, 1.5 to 5 times the standard addition amount, respectively).
  • the control by the timer as in the third and fourth embodiments is particularly effective when the SS concentration in the raw water is stable (the fluctuation width is relatively small).
  • the coagulation sedimentation apparatus and its activation method according to the present invention are suitable for treating yard wastewater, but can also be applied to other various wastewater treatments.
  • ⁇ “ Starting up ”of the coagulation sedimentation apparatus in the present invention includes not only the start of operation of the newly installed apparatus but also the first start of operation after draining water from each tank, such as for maintenance and transportation.
  • the kind of the inorganic flocculant and the polymer flocculant used in the present invention is not particularly limited, and examples of the inorganic flocculant include polyaluminum chloride (PAC), ferric chloride, ferric sulfate, and polyiron sulfate. Can be used.
  • PAC polyaluminum chloride
  • ferric chloride ferric chloride
  • ferric sulfate ferric sulfate
  • polyiron sulfate can be used.
  • the polymer flocculant for example, a nonionic, cationic, anionic or amphoteric polymer flocculant can be used.
  • the above embodiment is an example of the present invention, and the present invention may be applied to other modes.
  • the SS meter is provided on the pipe 27, but may be provided on the pipe 21 or 25.
  • the period in which the amount of addition of various coagulants is increased may be a part of the period in which the valve 26 is open.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

Un dispositif de floculation et de sédimentation et son procédé de démarrage sont fournis avec lesquels il est possible d'empêcher la décharge de boue à faible concentration lorsqu'il est, lors du démarrage d'un dispositif de floculation et de sédimentation de type portable ou d'un dispositif de floculation et de sédimentation, les réservoirs de floculation étant remplis d'eau, l'eau à traiter s'écoulant dans le dispositif de floculation et de sédimentation. Le dispositif de floculation et de sédimentation 1 est pourvu d'un premier réservoir de floculation 2 qui soumet l'eau brute à un traitement de floculation avec un premier floculant, d'un second réservoir de floculation 3 qui soumet la première eau floculée à un traitement de floculation avec un second floculant et un promoteur de sédimentation, et un réservoir de sédimentation 4 qui règle et sépare la seconde eau floculée en eau traitée et une boue, et un cyclone 20 qui sépare la suspension extraite du réservoir de sédimentation 4 en une boue séparée et le promoteur de sédimentation, et qui renvoie le promoteur de sédimentation séparé dans le second réservoir de floculation 3; le dispositif de floculation et de sédimentation 1 est caractérisé en ce qu'il est pourvu d'un dispositif de commande 30 qui renvoie les boues séparées du cyclone au premier réservoir de floculation 2 au démarrage du dispositif de floculation et de sédimentation 1, et, après achèvement du démarrage, commande un moyen de commutation pour effectuer une commutation de telle sorte qu'au moins une partie des boues séparées du cyclone 20 soit évacuée vers l'extérieur du système.
PCT/JP2019/026497 2018-08-10 2019-07-03 Dispositif de floculation et de sédimentation et sont procédé de démarrage WO2020031567A1 (fr)

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JP2013078715A (ja) * 2011-10-03 2013-05-02 Japan Organo Co Ltd 凝集沈殿装置
US20140339158A1 (en) * 2013-05-20 2014-11-20 Veolia Water Solutions & Technologies Support System and Process for Removing Ammonium, Soluble BOD and Suspended Solids from a Wastewater Stream
JP2014237122A (ja) * 2013-05-07 2014-12-18 新日鐵住金株式会社 凝集沈殿装置及び凝集沈殿方法

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JP3866054B2 (ja) 2001-05-31 2007-01-10 オルガノ株式会社 凝集沈澱装置およびその制御方法

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Publication number Priority date Publication date Assignee Title
JP2000317220A (ja) * 1999-05-12 2000-11-21 Japan Organo Co Ltd 凝集沈澱装置
US20110036772A1 (en) * 2007-06-22 2011-02-17 I. Kruger Inc. Method of Removing Phosphorus from Wastewater
US20110127220A1 (en) * 2007-12-20 2011-06-02 Otv Sa Method for Treating Water by Advanced Oxidation and Ballasted Flocculation, and Corresponding Treatment Plant
JP2013078715A (ja) * 2011-10-03 2013-05-02 Japan Organo Co Ltd 凝集沈殿装置
JP2014237122A (ja) * 2013-05-07 2014-12-18 新日鐵住金株式会社 凝集沈殿装置及び凝集沈殿方法
US20140339158A1 (en) * 2013-05-20 2014-11-20 Veolia Water Solutions & Technologies Support System and Process for Removing Ammonium, Soluble BOD and Suspended Solids from a Wastewater Stream

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