WO2006070382A1 - Appareil d'ecumage - Google Patents

Appareil d'ecumage Download PDF

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Publication number
WO2006070382A1
WO2006070382A1 PCT/IN2004/000414 IN2004000414W WO2006070382A1 WO 2006070382 A1 WO2006070382 A1 WO 2006070382A1 IN 2004000414 W IN2004000414 W IN 2004000414W WO 2006070382 A1 WO2006070382 A1 WO 2006070382A1
Authority
WO
WIPO (PCT)
Prior art keywords
scum
reactor
shaft
paddle
prime mover
Prior art date
Application number
PCT/IN2004/000414
Other languages
English (en)
Inventor
Ramamoorthy Alwar Ramanujam
Krishnasami Thirumaran
Rajendran Arumugam
Original Assignee
Council Of Scientific And Industrial Research
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 Council Of Scientific And Industrial Research filed Critical Council Of Scientific And Industrial Research
Priority to PCT/IN2004/000414 priority Critical patent/WO2006070382A1/fr
Publication of WO2006070382A1 publication Critical patent/WO2006070382A1/fr

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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
    • B01D21/02—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
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/2433—Discharge mechanisms for floating particles

Definitions

  • the present invention relates to a novel apparatus for scum removal for industrial application. More particularly, the present invention relates to an apparatus for incorporating in a reactor for destruction and removal of scum and foam, generated therein during the course of reactions.
  • the apparatus of the invention has tremendous application in biochemical and chemical industries for sustaining reactions, which are otherwise likely to get slowed down or terminated due to the formation of scum in the system. It also finds potential application in wastewater treatment plants and solid waste treatment digesters.
  • Scum is essentially a frothy substance formed in reactors during the course of any biochemical or chemical reaction and is responsible for hindering the reaction rate. The reaction even gets terminated with the accumulation of scum in the reactor. This has been a serious problem of much concern for any biotechnological and chemical industry. Treatment of wastewater and industrial effluent through biotechnological process has attained much focus in the present day scenario. Formation of scum during the course of waste treatment poses a major challenge to the environmental scientists too.
  • the performance of biochemical/biotechnological process depends mainly on the organic constituents, essentially of lipid, protein and carbohydrates present in the feed material.
  • organic constituents essentially of lipid, protein and carbohydrates present in the feed material.
  • industrial and municipal solid wastes are in general mixtures of biodegradable and non-biodegradable matters and the organic matter contents in the raw feed fluctuate widely.
  • scum formation and foam generation are bound to take place within the digester.
  • the scum layer formed on the surface of liquid aids foaming when the gas evolution rate is high.
  • the accumulation of foam in the gas space inside the reactors prevents the release of gas from the liquid and also the flow of gas from the reactor to the gas collection facility.
  • Methane generator wherein the gas collector slidably mounted in the upper portion of the generator is provided with rods that extend downward through slotted retainer into the organic material for agitating the organic material within the liquid slurry.
  • the characteristic feature of the system is that the scum formed on the surface is only pierced by the rods and its effect is intermittent as the rate of movement of rods again depends on the rate of gas production and the rotating movement of to and fro in the slots causes piercement of scum only in the surface area covered by the slots where the rods are rotating and the remaining area is undisturbed.
  • the major limitation associated with this arrangement is that it does not remove scum from the surface and it aids gas production only in the area where the surface is pierced and other areas the scum builds up on the surface.
  • This device does not effectively remove the scum from the surface of liquid where the scum is generated in the purification tank, as the blowing pressurised water cannot cover the entire liquid surface area and physically break the entire scum layer for its efficient removal along with overflow water.
  • the main object of the present invention is to provide a novel apparatus for scum removal for industrial application, which obviates the limitation as stated above.
  • Another object of the present invention is to eliminate building up of the foam and to eliminate the formation of scum blanket.
  • the present invention provides an apparatus for scum removal for industrial application, which comprises a toothed paddle arm (4) supported on a shaft (2) and connected to the shaft (2), provided with bearing (3), the shaft being connected to a reversible prime mover (5), the whole attachment being incorporated on liquid reactants (7) contained inside a conventional reactor (1), the drive being driven by a reversible prime mover (5) from a source (not shown in figure), and transmitted through shaft-bearing arrangement, the rotary motion horizontally to the paddle or vertically through a transmission mechanism (6), to the paddle, thereby displacing scum radially to the outlet of the reactor.
  • the teeth in the toothed paddle arm is positioned at a pitch of 5 - 30 cm.
  • the prime mover is selected from an electric motor, which can rotate in clockwise and anticlockwise directions to simultaneously revolve the toothed paddle in clockwise or anticlockwise directions.
  • the transmission mechanism is selected from belt drive, rope drive, gear drive.
  • the angle of positioning of the shaft-bearing-prime mover with respect to the axis of the reactor is either 0° or 90°.
  • Figure 1 represents a cross-section of the apparatus for scum removal.
  • the components of Figure 1 are referenced by the following numerals:
  • the apparatus of the present invention comprises of toothed paddle arm (4) supported on a shaft connected to the shaft (2), provided with beai ing (3).
  • the shaft is connected to a reversible prime mover (5) and the assembly of shaft-bearing-prime mover is positioned at an angle of 0° or 90° with respect to the axis of the reactor in which it is intended to be incorporated.
  • the whole attachment is incorporated on the liquid reactants (7) contained inside a conventional reactor (1).
  • the drive driven by the reversible prime mover (5) from a source (not shown in the drawing), transmits through shaft-bearing arrangement the rotary motion horizontally to the paddle or vertically through a transmission mechanism (6), to the paddle, that displaces the scum radially to the outlet of the reactor.
  • the inventive step of the present invention lie.; in the incorporation of the toothed paddle, which, drawing its rotary motion from the prime mover through the shaft, induces turbulent effect on the fluids present in the reactor, resulting in breaking and radial displacement of the scum, accumulated on the fluid during the course of the biochemical or chemical reaction, towards the outlet of the reactor, thereby ensuring the reaction to continue in scum free environment uninterruptedly.
  • a scum removal apparatus having toothed paddle of length 30 cm, width 5 cm and the teeth positioned at 30 cm pitch was fixed horizontally in a biomethanation reactor of 1.0 m diameter and 1.0 m height, which was found to produce 2 - 7 g/m 3 of scum layer having solid content of 25 to 35 percent and specific gravity of the scum between 0.93 - 0.95.
  • the shaft-bearing-prime mover was positioned at an angle of 90° with respect to the axis of the reactor.
  • the paddle was rotated at a speed of 2 rpm once in an hour continuously for a period of 2 minutes using gear drive sourc ⁇ d from a reversible electric motor, which rotated in clockwise and anticlockwise directions to simultaneously revolve the toothed paddle in clockwise or anticlockwise directions.
  • the turbulence created in the liquid contained in the reactor by the rotation of the paddle was found to break the scum and displace it radially to the outlet of the reactor.
  • the scum removal efficiency was 90% and the rate of gas release from the surface has increased by 15%.
  • the variation observed in the gas production for an organic loading rate of 1.5 kg VS/m 3 .d was ⁇ l %.
  • a scum removal apparatus having toothed paddle of length 30 cm, width 7.5 cm and the teeth positioned at 15 cm pitch was fixed horizontally in a biomethanation reactor of 1.0 m diameter and 1.0 m height, which was found to produce 7 - 12 g/m 3 of scum layer having solid content of 35 to 45 percent and specific gravity of the scum between 0.93 - 0.95.
  • the shaft-bearing-prime mover was positioned at an angle of 0° with respect to the axis of the reactor.
  • the paddle was rotated at a speed of 5 rpm once in an hour continuously for a period of 3 minutes using rope drive sourced from a reversible electric motor, which rotated in clockwise and anticlockwise directions to simultaneously revolve the toothed paddle in clockwise or anticlockwise directions.
  • the turbulence created in the liquid contained in the reactor by the rotation of the paddle was found to break the scum and displace it radially to the outlet of the reactor. Thus the reaction in the reactor continued uninterruptedly.
  • the shaft-bearing-prime mover was positioned at an angle of 90° with respect to the axis of the reactor.
  • the paddle was rotated at a speed of 2 rpm once in an hour continuously for a period of 2 minutes using belt drive sourced from a reversible electric motor, which rotated in clockwise and anticlockwise directions to simultaneously revolve the toothed paddle in clockwise or anticlockwise directions.
  • the turbulence created in the liquid contained in the reactor by the rotation of the paddle was found to break the scum and displace it radially to the outlet of the reactor. Thus the reaction in the reactor continued uninterruptedly.
  • a scum removal apparatus having toothed paddle of length 30 cm, width 7.5 cm and the teeth positioned at 5 cm pitch was fixed horizontally in a biomethanation reactor of 1.0 m diameter and 1.0 m height, which was found to produce 7 - 12 g/m J of scum layer having solid content of 35 to 45 percent and specific gravity of the scum between 0.93 - 0.95.
  • the shaft-bearing-prime mover was positioned at an angle of 0° with respect to the axis of the reactor.
  • the paddle was rotated at a speed of 5 rpm once in an hour continuously for a period of 3 minutes using belt drive sourced from a reversible electric motor, which rotated in clockwise and anticlockwise directions to simultaneously revolve the toothed paddle in clockwise or anticlockwise directions.
  • the turbulence created in the liquid contained in the reactor by the rotation of the paddle was found 1 to break the scum and displace it radially to the outlet of the reactor. Thus the reaction in the reactor continued uninterruptedly.
  • the scum removal efficiency was 98% and the rate of gas release from the surface has increased by 18%.
  • the variation observed in the gas production for an organic loading rate of 2.5 kg VS/m 3 .d was ⁇ 1%.
  • the apparatus of the present invention enhances the efficiency of the process being carried out in a reactor.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Removal Of Floating Material (AREA)

Abstract

La présente invention concerne un appareil d'écumage où une palette dentée induit un effet de turbulence sur les fluides présents dans le réacteur grâce à son mouvement rotatif. Ce mouvement produit un déplacement à la fois de rupture et radial sur l'écume accumulée sur le fluide, pendant la réaction biochimique et chimique, vers la sortie du réacteur, ce qui permet à la réaction de se poursuivre sans interruption dans un environnement exempt d'écume.
PCT/IN2004/000414 2004-12-27 2004-12-27 Appareil d'ecumage WO2006070382A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IN2004/000414 WO2006070382A1 (fr) 2004-12-27 2004-12-27 Appareil d'ecumage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IN2004/000414 WO2006070382A1 (fr) 2004-12-27 2004-12-27 Appareil d'ecumage

Publications (1)

Publication Number Publication Date
WO2006070382A1 true WO2006070382A1 (fr) 2006-07-06

Family

ID=35229765

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IN2004/000414 WO2006070382A1 (fr) 2004-12-27 2004-12-27 Appareil d'ecumage

Country Status (1)

Country Link
WO (1) WO2006070382A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8540971B2 (en) 2004-08-27 2013-09-24 Colgate-Palmolive Company Oral care composition with cross-linked polymer peroxide

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000043320A1 (fr) * 1999-01-25 2000-07-27 The Lenox Institute Of Water Technology, Inc. Clarificateur trois zones a flottation a l'air dissous dote de lamelles fixes et systeme perfectionne d'extraction de boues a palettes et a rampe
DE20013464U1 (de) * 1999-04-29 2000-10-19 Hans Huber Ag Masch & Anlagenb Vorrichtung zum Räumen von Leichtstoffen von der Oberfläche einer Flüssigkeit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000043320A1 (fr) * 1999-01-25 2000-07-27 The Lenox Institute Of Water Technology, Inc. Clarificateur trois zones a flottation a l'air dissous dote de lamelles fixes et systeme perfectionne d'extraction de boues a palettes et a rampe
DE20013464U1 (de) * 1999-04-29 2000-10-19 Hans Huber Ag Masch & Anlagenb Vorrichtung zum Räumen von Leichtstoffen von der Oberfläche einer Flüssigkeit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8540971B2 (en) 2004-08-27 2013-09-24 Colgate-Palmolive Company Oral care composition with cross-linked polymer peroxide

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