WO2012143851A2 - Système de traitement d'eau - Google Patents

Système de traitement d'eau Download PDF

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Publication number
WO2012143851A2
WO2012143851A2 PCT/IB2012/051910 IB2012051910W WO2012143851A2 WO 2012143851 A2 WO2012143851 A2 WO 2012143851A2 IB 2012051910 W IB2012051910 W IB 2012051910W WO 2012143851 A2 WO2012143851 A2 WO 2012143851A2
Authority
WO
WIPO (PCT)
Prior art keywords
reactor
wastewater
stream
clarifier
tank
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB2012/051910
Other languages
English (en)
Other versions
WO2012143851A3 (fr
Inventor
Stefan Adrian FOURIE
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to AU2012245943A priority Critical patent/AU2012245943A1/en
Priority to AP2013007243A priority patent/AP2013007243A0/xx
Publication of WO2012143851A2 publication Critical patent/WO2012143851A2/fr
Publication of WO2012143851A3 publication Critical patent/WO2012143851A3/fr
Anticipated expiration legal-status Critical
Priority to ZA2013/08187A priority patent/ZA201308187B/en
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0039—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
    • B01D21/0087—Settling tanks provided with means for ensuring a special flow pattern, e.g. even inflow or outflow
    • 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
    • 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
    • C02F1/5281—Installations for water purification using chemical agents
    • 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
    • C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/56—Macromolecular compounds

Definitions

  • This invention relates to a water treatment system.
  • this invention relates to a reactor for use in a water clarifier or settler in a water treatment system for clarifying wastewater in the mining industry and a method of clarifying the wastewater.
  • Clarifiers or settlers as they are also referred to, are well known in the field of water treatment and generally form part of a water treatment system.
  • a clarifier includes a tank into which wastewater is pumped through a pipe, also known as a downcomer. The outlet of the downcomer is submerged in a slurry mixture and introduces wastewater into the slurry. The particulates in the wastewater get trapped in the slurry while the water siphons through and eventually the clarified water is collected in a launder at the top of the tank. An outlet at the bottom of the tank is used to drain the slurry containing the particulates. In such a conventional clarifier a rise or overflow rate of about 4 m/s is achieved.
  • a flocculent is usually also introduced into the clarifier to induce a process wherein particulates or colloids come out of suspension in the form of floccules or flakes.
  • Flocculation treatment systems employ a physical/chemical process and remove mostly particulates and colloidal solids present in the wastewater. The floccules get trapped in the slurry and are ultimately drained from the tank though the slurry outlet.
  • a disadvantage of the conventional clarifiers is that the low overflow rates result in large tanks being used to achieve an acceptable volumetric flow rate. This, in turn, has adverse cost implications.
  • a reactor for use in a clarifier of a water treatment system including.”
  • a body for receiving a stream of wastewater from a feed line of the clarifier having a first opening which is, in use, an upper opening through which clarified water is released and second opening which is, in use, a lower opening through which slurry is dispensed;
  • a diverting formation which is positioned in line with the accelerated stream of wastewater so that the wastewater stream strikes the diverting formation after having been accelerated.
  • the acceleration means may be in the form of a venturi located below the outlet of the feed line so that the stream of wastewater entering the reactor is accelerated after having been dispensed through the outlet of the feed line.
  • the venturi is preferably positioned relative to the feed line so that, in use, the top of the venturi is at least level or below the outlet of the feed line.
  • the diverting formation is profiled to divert the incoming stream of wastewater radially outwards.
  • the diverting formation is profiled to divert the wastewater stream in a radially outward and upward direction.
  • the reactor may further include a deflecting arrangement located about the diverting formation and positioned to increase the boundary layer on an inside surface of the body.
  • a ciarifier including:
  • a feed line for introducing wastewater into the tank;
  • a slurry outlet located in a lower region of the tank through which slurry is drained from the tank;
  • the reactor being a reactor according to the first aspect of the invention.
  • the ciarifier may include a number of supply tanks supplying a number of reactors by means of individual feed lines running from each supply tank to an associated reactor.
  • the ciarifier may include a central supply tank supplying a number of reactors by means of feed lines running from the supply tank to each reactor.
  • the supply tank or tanks are preferably located completely outside the primary tank.
  • a method of clarifying wastewater in a reactor of a ciarifier including the following steps:
  • the step of diverting the accelerated stream of wastewater radially outwards preferably includes diverting the wastewater stream at an upward angle.
  • the method preferably includes the step of recycling the particulates which were not caught in the boundary layer through the acceleration means.
  • the method may include the step of introducing a flocculent in the water so that a flocculation process takes place inside the reactor.
  • Figure 1 shows a diagrammatic representation of a prior art clarifier
  • Figure 2 shows a diagrammatic representation of a clarifier according to the invention
  • Figure 3 shows a cross sectional view of a reactor according to the invention.
  • Figure 4 shows a cross sectional view of a reactor according to a second embodiment of the invention. DESCRIPTION OF THE ILLUSTRATED EMBODIMENT
  • FIG 1 shows a diagrammatic representation of a prior art clarifier 100 as described above.
  • the clarifier 100 includes a tank 102 and a number of reactors 104 which each has an outer ring or body 106, an inner ring 108 and a diverting formation 110. Only one reactor is shown in Figure 1.
  • the reactor 104 is supplied with wastewater from a supply tank 112 via a supply line 114, also known as a downcomer. The wastewater is supplied into the reactor 104 through an outlet 116 of line 114.
  • the body 106 tapers towards a slurry outlet 118 which is located at the bottom of the ring and through which the slurry exits the reactor.
  • the clarified water is, in turn, dispensed at the top of the body 104.
  • the clarified water rises all the way to the top of the tank 101 until it eventually flows over the edge of the tank and into launders 120.
  • the slurry eventually exits the clarifier 100 through a primary outlet 122 located at the bottom of tank 103.
  • the configuration of components inside the reactor 104 allows slurry to build up inside the reactor to such an extent that the majority of the body 106 is filled with slurry.
  • the slurry level inside the reactor is shown in broken lines in Figure 1.
  • FIG. 2 shows a diagrammatical representation of a clarifier 10 according to the invention.
  • the clarifier 10 is typically part of a water treatment system which is used to clarify wastewater in a flocculation process.
  • the clarifier 10 includes a primary tank 12 which houses a number of reactors 30 of which only one is shown in the figures. Each reactor is supplied with wastewater from a supply tank 14 via a feed line or downcomer 16. The wastewater is introduced into the reactor 30 through an outlet 18 of line 6.
  • Each reactor 30 has a body 32 for receiving the stream of wastewater from the feed line 16, means 34 for accelerating the wastewater stream and a diverting formation 36 for diverting the incoming stream of wastewater.
  • the body 30 has a first opening which is, in use, an upper opening 38.1 through which clarified water is released and second opening which is, in use, a lower opening 38.2 through which slurry exits the body.
  • the body 32 tapers down towards the lower opening 38.2, also referred to as the slurry outlet.
  • the particulates in the wastewater eventually exit the tank 12 through a primary outlet 22 located at the bottom of tank, while the clarified water rises all the way to the top of the tank until it eventually flows over the edge and into launders 20.
  • the reactor 30 is shown in greater detail in Figure 3. From this figure it can be seen that the outlet 18 of the feed line 16 is located inside the body 32. In the preferred embodiment the body is largely cylindrical and located concentrically about the feed line 16 and, accordingly, the wastewater entry flow direction, which is indicted by the reference sign A.
  • the acceleration means 34 accelerates the wastewater inlet stream introduced into the body.
  • the acceleration means 34 is shaped to form a neck formation 40 which narrows the diametrical flow area through which the wastewater stream is allowed to flow. This shape is also commonly referred to a venturi and according to the venturi effect the velocity of the wastewater stream will increase as a result of the decrease in diametrical flow area.
  • the venturi 34 is located below the feed line outlet 18 so that the stream of wastewater entering the body 32 is accelerated after having been dispensed through the feed line outlet.
  • the venturi 34 is positioned relative to the feed line so that in use its top is at least level or below the feed line outlet 18. It is however envisaged that in alternative embodiments the venturi 34 may be positioned so that the outlet 18 is located inside the venture but above the neck formation 40.
  • the velocity of the wastewater inlet stream is increased in order to increase the speed at which the wastewater stream strikes the diverting formation 36. It must be understood that the velocity of the stream must be sufficiently high so that the particulates therein are thrown radially outward by the diverting formation 36 towards the sidewall of the body 32.
  • the diverting formation 36 is profiled so as to divert the wastewater stream in a radially outward and upward direction.
  • the diverting formation has a disc-like shape with its outer profile being circular. As shown in Figure 3, the thickness of the disc-like diverting formation 36 reduces radially outward before increasing again near its outer extremity so that the wastewater is deflected at an upward angle when leaving the diverting formation.
  • the flow direction caused by the diverting formation 36 is indicated by reference sign B in Figure 3.
  • a person familiar with fluid mechanics will know that the flow of fluid in the body 32 will create a boundary layer 42 in the immediate vicinity of the inside surface of the body as a result of the effects of viscosity of the fluid.
  • the boundary layer 42 is shown in broken lines in Figure 3.
  • the particulates in the inlet wastewater stream will be thrown towards the boundary layer 42. It will be understood that the larger and heavier particulates will be thrown farther than the smaller and lighter particulates. Ideally the heavier particulates will be thrown into the boundary layer 42 where it will be captured and gradually move down towards the slurry outlet 38.2.
  • the movement of the captured particulates in the boundary layer is indicated by reference sign C.
  • the lighter particulates will rise in the annular space between the venturi 34 and sidewall of the body 32 until the suction forces created by the venturi will cause the particulates to be drawn though the venturi again.
  • the flow direction of the particulates at the top of the venturi 34 is indicated by reference sign D.
  • a flocculent is also introduced into the wastewater stream in the water treatment cycle.
  • the flocculent will cause the particulate material to come out of suspension in the form of floccules or flakes.
  • the fluid flow pattern inside the reactor 30 will cause the particulates to be recycled through the venturi until they have reached a sufficient size to be thrown into the boundary layer 42.
  • the flocculation process taking place inside the reactor ensures that the floccules reach a sufficient size as they are recycled through the venturi.
  • FIG. 4 shows another embodiment 50 of the reactor.
  • like references designate like features.
  • the boundary layer 42 is increased in order to increase the efficiency of the reactor.
  • the boundary layer 42 smaller sized particulates or floccules will be caught therein, thus resulting in floccules being recycled a fewer number of times through the venturi.
  • the efficiency of the water clarifying process is increased and, accordingly, the overflow rate of the clarifier.
  • the boundary layer 42 is increased by inserting a boundary layer deflecting arrangement 52 in the reactor 50.
  • the deflecting arrangement 52 is in the form of a circular ring and located about the diverting formation 36.
  • the location of the deflecting arrangement 52 is critical in that the boundary layer 42 must be drawn away from the inner surface of the body 32 as shown in Figure 4. If the deflecting arrangement 52 is located too far away from the inner surface of the body 32, the boundary layer will simply follow the inner surface without being deflected. Ideally the position of the deflecting arrangement must be set according to the flow parameters in the reactor 50 so that a maximum amount of boundary deflection is achieved.
  • each reactor 30, 50 in the illustrated embodiments is supplied by a corresponding wastewater supply tank 14, it is envisaged that a single supply tank could be used to supply wastewater to all of the reactors. In the event of a central supply tank being used, the reactors are supplied with wastewater via separate supply lines running from the central tank.
  • a stream of wastewater is introduced into the body 32 of the reactor 30, 50 through the feed line 16. Thereafter the wastewater stream is accelerated before striking the diverting formation 36. As a result of the stream striking the formation 36, it is diverted in a radially outward and upward direction. The heavier particulates present in the wastewater is then caught in the boundary layer created on the inside surface of the reactor body 32. The captured particulates are transported down to the slurry outlet 38.2 at the bottom of the reactor body 32 while the clarified water is released though the upper opening 38.1 of the body. The clarified water is eventually collected in the launder 20 at the top of the tank 12 while the particulates exit the tank 12 though the outlet 22.
  • the method also includes the step of adding a flocculent in order to increase the size and weight of the particles while they are being recycled through the venturi.
  • the method further includes the step of increasing the boundary layer by adding a deflecting arrangement about the diverting formation.
  • An advantage of using the clarifier 30, 50 according to the invention is that the overflow rates and therefore the efficiency of the clarifier are increased as a result of the increase in velocity of the wastewater stream and the increase in the size of the boundary layer.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)

Abstract

L'invention porte sur un réacteur (30, 50) destiné à être utilisé dans un clarificateur (10) d'un système de traitement d'eau. Le réacteur (30) comprend un corps (32) destiné à recevoir un courant d'eau résiduaire provenant d'une conduite d'alimentation (16) du clarificateur. Le corps (32) comprend une première ouverture (38.1) qui est, lors de l'utilisation, une ouverture supérieure par laquelle sort de l'eau clarifiée et une seconde ouverture (38.2) qui est, lors de l'utilisation, une ouverture inférieure par laquelle sort de la boue. Le courant d'eau résiduaire introduit dans le corps (32) est amené à être accéléré à l'aide d'un moyen d'accélération (34), en particulier un venturi situé au-dessous de la sortie (18) de la conduite d'alimentation (16). Un déflecteur (36) est en outre placé dans l'alignement du courant accéléré d'eau résiduaire afin que le courant d'eau résiduaire frappe le déflecteur après avoir été accéléré. L'invention porte également sur un clarificateur (10) comprenant un réacteur (30, 50) ainsi que sur un procédé de clarification d'eau résiduaire dans un réacteur (30, 50) du clarificateur (10).
PCT/IB2012/051910 2011-04-19 2012-04-17 Système de traitement d'eau Ceased WO2012143851A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU2012245943A AU2012245943A1 (en) 2011-04-19 2012-04-17 Water treatment system
AP2013007243A AP2013007243A0 (en) 2011-04-19 2012-04-17 Water treatment system
ZA2013/08187A ZA201308187B (en) 2011-04-19 2013-11-01 Water treatment system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA201102937 2011-04-19
ZA2011/02937 2011-04-19

Publications (2)

Publication Number Publication Date
WO2012143851A2 true WO2012143851A2 (fr) 2012-10-26
WO2012143851A3 WO2012143851A3 (fr) 2012-12-27

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ID=47041979

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PCT/IB2012/051910 Ceased WO2012143851A2 (fr) 2011-04-19 2012-04-17 Système de traitement d'eau

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AP (1) AP2013007243A0 (fr)
AU (1) AU2012245943A1 (fr)
WO (1) WO2012143851A2 (fr)
ZA (1) ZA201308187B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110372077A (zh) * 2019-06-28 2019-10-25 东北石油大学 加载聚结絮凝装置及一种含油污水处理方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4670848A1 (fr) * 2024-06-27 2025-12-31 Metso Finland Oy Appareil de traitement de boue et équipement de traitement de flux de boue et unité de cellule de flottation associée à celui-ci

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU1485366A (en) * 1967-04-17 1968-10-24 William Gould Bernard Upflow sedimentation and solids contact tank inlet and baffle arrangements to promote sludge recirculation inside the tank
GB2369838A (en) * 2000-12-08 2002-06-12 Qed Internat Ltd Method and apparatus for cleaning drill cuttings
DE102005053151A1 (de) * 2005-11-04 2007-05-10 Epuramat S.A.R.L. Verfahren und Vorrichtung zum Eindicken von in Abwasser mitgeführtem Schlamm

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110372077A (zh) * 2019-06-28 2019-10-25 东北石油大学 加载聚结絮凝装置及一种含油污水处理方法
CN110372077B (zh) * 2019-06-28 2021-09-07 东北石油大学 加载聚结絮凝装置及一种含油污水处理方法

Also Published As

Publication number Publication date
ZA201308187B (en) 2015-02-25
AP2013007243A0 (en) 2013-11-30
WO2012143851A3 (fr) 2012-12-27
AU2012245943A1 (en) 2013-12-05

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