EP0120039A1 - Recuperation de solides a partir de dispersions - Google Patents

Recuperation de solides a partir de dispersions

Info

Publication number
EP0120039A1
EP0120039A1 EP83902942A EP83902942A EP0120039A1 EP 0120039 A1 EP0120039 A1 EP 0120039A1 EP 83902942 A EP83902942 A EP 83902942A EP 83902942 A EP83902942 A EP 83902942A EP 0120039 A1 EP0120039 A1 EP 0120039A1
Authority
EP
European Patent Office
Prior art keywords
dispersion
particles
flocculated
recovery
liquid medium
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.)
Withdrawn
Application number
EP83902942A
Other languages
German (de)
English (en)
Inventor
Jeremy James Lees
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.)
Ilecard Pty Ltd
Original Assignee
Ilecard Pty Ltd
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 Ilecard Pty Ltd filed Critical Ilecard Pty Ltd
Publication of EP0120039A1 publication Critical patent/EP0120039A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B9/00—General arrangement of separating plant, e.g. flow sheets
    • B03B9/06—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse
    • B03B9/061—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse the refuse being industrial
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D37/00—Processes of filtration
    • B01D37/03—Processes of filtration using flocculating agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B1/00—Conditioning for facilitating separation by altering physical properties of the matter to be treated
    • B03B1/04—Conditioning for facilitating separation by altering physical properties of the matter to be treated by additives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B9/00—General arrangement of separating plant, e.g. flow sheets
    • B03B9/005—General arrangement of separating plant, e.g. flow sheets specially adapted for coal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D3/00—Differential sedimentation
    • B03D3/06—Flocculation
    • 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
    • C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly

Definitions

  • the present invention relates to a process for the recovery of solid materials from dilute dispersions of finely divided particles of a solid material in a liquid medium.
  • the present invention consists in a process for the recovery of solid materials from dilute dispersions of finely divided particles of a solid material in a liquid medium, the process comprising adding to the dispersion an agglomeration agent capable of inducing flocculation and/or agglomeration of the particles, mixing the agglomeration agent and the dispersion, conditioning the mixture so formed to allow flocculation and/or agglomeration of the finely divided particles to take place until substantially all of the agglomeration agent has been utilized, and passing the flocculated and/or agglomerated mixture, substantially without shearing the flocculated and/or agglomerated particles, to a rapped or vibrated sieve bend such that the flocculated and/or agglomerated particles may be recovered as overflow from the sieve bend and at least part of the liquid medium may be recovered as an underflow therefrom.
  • the present invention further consists in a circuit for the recovery of solid materials from dilute dispersions of finely divided particles of solid material in a liquid medium, the circuit comprising supply means for the dispersion, means to mix the dispersion with a flocculation and/or agglomeration agent, a condition vessel in which the particles of the dispersion may flocculate and/or agglomerate and a rapped or vibrated sieve bend over which the flocculated and/or agglomerated dispersion may be passed to produce an oversize stream or an undersize stream.
  • the present invention is designed to flocculate such particles and remove them on a rapped or vibrated sieve bend.
  • a sieve bend would have the effect of breaking the floccs and would not be effective in recovery of the flocculated and/or agglomerated particles.
  • the present inventors have found, however, that the process according to this invention is extremely effective for the recovery of many types of fine particles from dispersions thereof.
  • Dispersions which have been found to be capable of effective treatment by the method according to this invention include animal wastes such as piggery wastes and cattle effluent wastes, sewage, asbestos and coal.
  • the process according to this invention may be utilised advantageously in respect of particles having a size down to 10 microns and in some cases even below that size.
  • an appropriate agglomeration agent will depend on the solid particles being agglomerated and/or flocculated, however, the selection may be made according to the known parameters in the art. Conveniently polyelectrolytes may be used, however, any of the known agglomeration or flocculation agents may be used.
  • the agglomeration agent must be mixed thoroughly with the dispersion being treated and this may be conveniently achieved by injection of the agglomeration agent into a stream of the dispersions immediately upstream from a pump. It has been found that the turbulence produced by the action of the pump is normally sufficient to adequately mix the agglomeration agent and the dispersion. Other conventional mixing means could, however, be used.
  • Conditioning preferably takes place by passing the stream of the dispersion containing the agglomeration agent through a conditioning vessel in which the rate of flow of the dispersion is substantially reduced. Under conditions of low flow rate the formation of floccs or agglomerates is encouraged and maximum flocc or agglomerate size is achieved. It is essential that the conditioning process be allowed to proceed until substantially all of the agglomeration agent has been utilized in the formation of floccs. If conditioning does not proceed for a sufficient time then there is a danger of floccs being formed in the sieve screen of the sieve bend which will cause blinding of the screen.
  • the conditioning vessel is operated under a mild overpressure in order that the pump used to produce the turbulence at the time of agglomeration agent addition may be used to feed the dispersion through the conditioning vessel and to the sieve bend substantially without shearing of the floccs and/or agglomerates. It is obvious that shearing or other destruction of the floccs and/or agglomerates would be deleterious to the process. It is therefore desirable to avoid the presence of a pump between the conditioning vessel and the sieve bend.
  • the dispersion to which the flocculation and/or agglomeration agent has been added is pumped from a conditioning vessel to the sieve bend by a pump which has only a limited shearing effect on the floccs or agglomerates such as a screw type pump.
  • the flocculation and/or agglomeration agent is preferably added to the dispersion in the conditioning vessel and the mixture slowly stirred as with a paddle stirrer.
  • the dispersion is in one embodiment of the invention preferably fed to the sieve bend as an upward flow through an elutriation device such that a substantially uniform flow of the dispersion occurs across the full width of the sieve bend.
  • the dispersion may be fed to the sieve bend through flow distribution device as described in Australian patent specification 80,859/82.
  • any rapped or vibrated sieve bend may be used in the process according to this invention it is highly desirable to use a sieve bend made according to Australian patent specification 90792/82.
  • This specification describes a sieve bend in which the sieve screen is connected to a surrounding frame only at its end edges. This allows the sieve screen to vibrate more freely under an applied rapping or vibrating force. It has been found that this free vibration of the sieve screen substantially reduces the chance of the screen blinding under any given circumstances.
  • the slot width of the sieve screen on the sieve deck is preferably from 4 millimeters down to 50 microns preferably 300 microns down to 75 microns. The exact size being selected to suit the particular floccs and agglomerates formed in the process.
  • the process according to the present invention has particular advantage when treating sewage or animal effluence. These materials commonly have to be transported for disposal and are normally obtained in a form having a solids content of from 1 to 2% by weight. The cost of transporting these materials is high in relation to their solids content. By utilizing the process according to this invention the solids content may be raised from 10 to 15%.
  • the water produced as underflow has been found to have a sufficiently low chemical and biological oxygen demand that it can be fed directly to conventional drains without adverse ecological effects.
  • the process according to this invention may also be used for the recovery of minerals slimes.
  • agglomeration may be brought about by the use of an agglomeration agent such as oil or polyelectrolytes which will preferentially agglomerate the hydrophobic particles leaving the hydrophilic particles at the water in a dispersed phase.
  • an agglomeration agent such as oil or polyelectrolytes which will preferentially agglomerate the hydrophobic particles leaving the hydrophilic particles at the water in a dispersed phase.
  • the circuit 10 is designed for the concentration of the solids content of piggery effluent.
  • the pigs In the conduct of a modern piggery the pigs are maintained in buildings with a grid like floor through which urine and faecal matter may fall into a disposal channel below the floor. Water is used to clean the styes and wash the effluent along the disposal channels.
  • the tank 11 receives this waste water in the circuit 10. Outflow from the tank 11 is controlled by valve 12 and flows through pipe 13 into a conditioning vessel 14.
  • a flocculent supply tank 15 is provided in the circuit 10. The flocculent is pumped by pump 16 through lines 17 and 18 through valves 19 and 21 respectively into the pipe 13 and the conditioning vessel 14.
  • a slowly moving paddle stirrer 22 is provided within the conditioning vessel 14. This stirrer 22 is driven by an electric motor 23 mounted on the top of the vessel 14 through a drive shaft 24.
  • a low shear, screw type pump 25 pumps the flocculated dispersion from the conditioning vessel through pipe 26 to a rapped sieve bend 27.
  • the sieve bend 27 includes a distribution box 28 to spread the flocculated dispersion evenly across the width of the sieve screen 29 of the sieve bend 27.
  • the sieve screen 29 is so mounted on surrounding frame (not shown) that it can vibrate and flex freely relative to
  • the sieve screen 29 is connected rigidly to the frame along a single end edge and is connected to the frame along the other end edge through a resilient attachment.
  • the sieve screen 29 is provided on its underside with a rapping bar and means 31 are provided to cause the sieve screen 29 to vibrate.
  • the undersize material which passes through the sieve screen 29 into a hopper 32 is discharged through pipe 33.
  • the oversize material is fed off the lower end of the screen 29 into pipe 34.
  • effluent is flowed from tank 11 down pipe 13.
  • the flocculation agent is pumped from tank 15 into pipe 13 to mix with the effluent stream. This mixed stream is then flowed into the conditioning vessel 14 where the slow stirring ensures thorough mixing of the effluent and the flocculation agent. Additional flocculation agent may be added to the conditioning vessel 14 through line 18 if required.
  • the conditioned and flocculated material is then pumped by pump 25, to the distribution means 28 where it is converted from a cylindrical flow into a flat stream flowing evenly onto the sieve bend 27.
  • the sieve screen 29 of the sieve bend 27 divides the dispersion into oversize and undersize streams.
  • the oversize stream largely comprises the flocculated particles of effluent and a proportion of the water while the undersize stream largely comprises water and dissolved organic and inorganic materials but very little solid material.
  • the flocculation reduced the suspended solids and B.O.D. content of the undersize material substantially and to an extent where it could be discharged as drainage effluent.
  • the oversize material was increased from 1 to 2% solids to approximately 15% solids. This substantially reduced the volume of high strength waste which had to be transported for disposal as sewage waste.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Treatment Of Sludge (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)

Abstract

Un procédé de récupération de matériaux solides provenant d'une dispersion diluée d'un matériau solide finement divisé, comme des déchets animaux, des eaux résiduelles, de l'amiante et du charbon, comprend l'addition à cette dispersion d'un agent agglomérant capable d'induire la floculation des particules, le mélange de l'agent agglomérant et de la dispersion, le conditionnement du mélange ainsi formé pour permettre à la floculation d'avoir lieu, ainsi que le passage du mélange floculé, pratiquement sans cisailler les particules floculées, dans un coude cribleur que l'on ébranle ou que l'on fait vibrer et la récupération des particules floculées à partir du trop-plein du coude cribleur.
EP83902942A 1982-09-29 1983-09-26 Recuperation de solides a partir de dispersions Withdrawn EP0120039A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU6113/82 1982-09-29
AUPF611382 1982-09-29

Publications (1)

Publication Number Publication Date
EP0120039A1 true EP0120039A1 (fr) 1984-10-03

Family

ID=3769764

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83902942A Withdrawn EP0120039A1 (fr) 1982-09-29 1983-09-26 Recuperation de solides a partir de dispersions

Country Status (5)

Country Link
EP (1) EP0120039A1 (fr)
JP (1) JPS59501616A (fr)
AU (1) AU1948183A (fr)
WO (1) WO1984001313A1 (fr)
ZA (1) ZA837242B (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8411192D0 (en) * 1984-05-02 1984-06-06 Celltech Ltd Separating animal cells from liquid culture
AU617698B2 (en) * 1987-10-22 1991-12-05 Edward Harris Greenwald Sr. Method and apparatus for separating clay from and then dewatering ultra fine coal
AU622805B2 (en) * 1989-06-05 1992-04-16 Malco Engineering Pty. Limited Combination bend screen
DE19828027A1 (de) * 1998-06-24 1999-12-30 Rheinische Werkzeug & Maschf Wurfsiebmaschine
GB2339425A (en) * 1998-07-11 2000-01-26 Clearmasters Environmental Lim De-watering apparatus
JP2013081895A (ja) * 2011-10-07 2013-05-09 Ulvac Japan Ltd 回収装置及び回収方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2307370A (en) * 1970-12-07 1972-06-08 N. B. Love Industries Pty. Ltd Flocculating particles in washing streams
AU474017B2 (en) * 1972-09-12 1976-07-08 Ceres Land Company Process and apparatus for recovering feed products from animal manure
PL104587B1 (pl) * 1976-03-27 1979-08-31 Kopalnia Wegla Kamiennego Bolesl Urzadzenie do ciaglego odwadniania w procesie hydromechanicznej i mechanicznej obrobki sflokulowanych mulow
AT357118B (de) * 1978-10-27 1980-06-25 Andritz Ag Maschf Einrichtung zur regelung einer entwaesserungs- maschine
JPS6089B2 (ja) * 1980-09-05 1985-01-05 日立機電工業株式会社 汚泥の脱水処理法及びその装置
AU539260B2 (en) * 1981-11-19 1984-09-20 Ilecard Pty. Ltd. Sieve screen deck
JPS6099416A (ja) * 1983-11-04 1985-06-03 Mitsubishi Electric Corp 圧延機の速度制御装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8401313A1 *

Also Published As

Publication number Publication date
JPS59501616A (ja) 1984-09-13
AU1948183A (en) 1984-04-24
ZA837242B (en) 1984-11-28
WO1984001313A1 (fr) 1984-04-12

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

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Effective date: 19841001

STAA Information on the status of an ep patent application or granted ep patent

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18W Application withdrawn

Withdrawal date: 19870206

RIN1 Information on inventor provided before grant (corrected)

Inventor name: LEES, JEREMY, JAMES