GB2309401A - Removal of contraries from green waste - Google Patents
Removal of contraries from green waste Download PDFInfo
- Publication number
- GB2309401A GB2309401A GB9601592A GB9601592A GB2309401A GB 2309401 A GB2309401 A GB 2309401A GB 9601592 A GB9601592 A GB 9601592A GB 9601592 A GB9601592 A GB 9601592A GB 2309401 A GB2309401 A GB 2309401A
- Authority
- GB
- United Kingdom
- Prior art keywords
- drum
- waste
- water
- contraries
- green
- 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- Withdrawn
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
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/28—Washing granular, powdered or lumpy materials; Wet separating by sink-float separation
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/18—Drum screens
- B07B1/22—Revolving drums
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
- B07B4/02—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall
- B07B4/06—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall using revolving drums
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
- C05F17/90—Apparatus therefor
- C05F17/964—Constructional parts, e.g. floors, covers or doors
- C05F17/971—Constructional parts, e.g. floors, covers or doors for feeding or discharging materials to be treated; for feeding or discharging other material
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
- Y02P20/145—Feedstock the feedstock being materials of biological origin
-
- 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
- Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse
-
- 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
-
- 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
- Y02W30/62—Plastics recycling; Rubber recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- Biotechnology (AREA)
- Health & Medical Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Microbiology (AREA)
- Molecular Biology (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
- Combined Means For Separation Of Solids (AREA)
Abstract
A method for removing unwanted components (contraries) from green waste comprises tumbling the green waste in a drum 24 which rotates about its longitudinal axis so that the waste is made to fall through the air inside the drum, whilst causing a stream of air to pass through the drum so as to carry low density materials such as paper or plastics films away from the falling waste; and causing the green waste to move through water so that lower density materials are carried in the water and higher density materials such as stones and glass fall through the water. The invention also provides apparatus for use in performing the method.
Description
REMOVAL OF CONTRARIES FROM GREEN WASTE
The present invention relates to apparatus and a method for removing unwanted contaminants from green waste. The invention is for use particularly in removing plastics materials, stones, and glass from green waste from civic amenity waste sites.
The term "green waste" is used herein to denote composted organic waste material which typically originates from domestic gardens. Green waste may comprise, for example, grass clippings, hedge cuttings, leaves and branches from trees. The green waste may be partially or wholly composted. Green waste typically comprises about 30 to 40% by weight of all civic amenity waste.
Most municipal tips have segregated skips for different types of domestic waste. Typically there will be separate skips for organic garden waste, metallic waste, and other types of waste. However there is inevitably some cross contamination between the different skips. Thus green waste will contain varying levels of unwanted contaminants (known as "contraries") such as plastics films, tin cans, stones, glass, paper and the like.
If the organic waste is to be buried in a land-fill site, the contaminants may not cause a problem. However the use of landfill is becoming increasingly costly, and it is desirable to recycle organic waste by shredding it up and composting it. Typically organic waste materials such as garden clippings are shredded up and composted for around eight to 12 weeks, with regular turning. The resulting green waste is used for mulches, soil conditioners, turf dressing or other applications.
Too high a level of contraries in green waste renders it unsuitable for use as a soil conditioner or a mulch.
Contraries are conventionally dealt with by shredding the green waste to a relatively fine particle size and passing the shredded waste through a fine screen. Pieces of glass, stone, and other unwanted materials which pass through the screen with the green waste are ignored.
Alternatively the shredded green waste is passed slowly along a long conveyor belt and obvious contraries are picked out by hand. The first method is wasteful and does not produce a satisfactory product for many applications; and the second method is expensive and labour intensive.
It is an object of the present invention to reduce the above mentioned problems.
According to a first aspect of the present invention there is provided a method of removing contraries from green waste, the method comprising the steps of: a. tumbling the green waste in a drum which rotates
about its longitudinal axis so that the waste is made
to fall through the air inside the drum, whilst
causing a stream of air to pass through the drum so
as to carry low density materials such as paper or
plastics films away from the falling waste;
and b. causing the green waste to move through water so that
lower density materials are carried in the water and
higher density materials such as stones and glass
fall through the water.
The process removes both low density and high density contraries from the green waste to leave a product which is suitable for use as a soil conditioning agent, a turf dressing, or a mulch, depending on particle size.
The two steps may be carried out in either order, although it is preferred to carry out the air separation step first, because the low density waste components will tend to separate more readily when not too wet. Moreover, the treated green waste is suitable for use without drying, even if it has a high moisture content.
The process may readily be automated so that untreated green waste is fed in, and usable treated green waste is produced, without manual intervention.
To facilitate the passage of green waste through the drum it is preferred that the longitudinal axis is angled to the horizontal, being higher at the point of entry and lower at the point of exit. A suitable angle may readily be determined by trial and error for a particular design of drum. A smaller angle increases the retention time in the drum, and facilitates more efficient removal of plastics and other films. Too great an angle reduces retention time in the drum but does not allow removal of enough plastics and other films. The optimum angle will depend on the quality standards required of the green waste. We have found that an angle in the range 0.5 to 50, and particularly around 2 , is suitable.
The drum is preferably rotated at 10 to 30 rpm, and it is particularly preferred that the drum be rotated at about 20 rpm.
Particularly large contraries such as bricks or large stones may damage the apparatus used in the process, so it is preferred that the process also include an initial further step of screening the waste to remove large contraries. This may be achieved by conventional means, for example a rotary screen comprising a plurality of rotating star wheels. The star wheels carry large contraries to a skip or conveyor for removal, whilst smaller waste materials fall through to be conveyed to the rotating drum. The initial screening may be set to remove any contraries over a preferred size, for example 60 mm.
For different applications, different particle size ranges may be appropriate. The process therefore also preferably includes separating the waste into a plurality of size range fractions. This may conveniently be achieved during the air separation stage, by providing the rotating drum with perforations through which waste particles can fall.
The perforations may be smaller in the region where waste enters the drum and larger in a region remote from the entrance to the drum. Thus smaller waste particles may be collected below one region of the drum, and larger waste particles may be collected from below a different region of the drum. Any sizes of perforate screen may be used; for example one screen may allow particles less than around 5 mm to fall through, and another may allow particles less than around 14 mm to fall through. In this example, three size ranges may be collected: less than 5 mm; 5 to 14 mm; greater than 14 mm (or 14 to 60 mm if an initial screening has been carried out using a 60 mm screen).
If the end use to which particles in any size range are to be put does not require the removal of high density contraries such as glass or stones, those particles may be excluded from the washing process (step b).
The stream of air may be made to flow through the drum by any suitable means, for example by means of a fan or blower. We have found that a particularly good separation may be achieved by using a fan which sucks air through the drum from the exit end, although it would also be possible for a fan or blower to blow air through from the entrance end of the drum. In a preferred embodiment the span of the fan blades is of generally similar dimension to the internal diameter of the drum, so as to create a generally laminar flow of air through most, and preferably all, of the cross sectional area of the drum.
According to a second aspect of the present invention there is provided apparatus for removing contraries from green waste for use in the process of the present invention, the apparatus comprising: a. a drum having an entrance at one end and an exit at
the other, rotatable about its longitudinal axis; b. means for causing a stream of air to pass through the
drum; c. means for washing the waste with water so that the
more dense components fall through the water and the
less dense components are carried in the water; and d. means for conveying waste from the drum to the
washing means.
It is preferred that the entrance and exit openings are in register with one another, to help promote laminar air flow through the drum. For this reason, it is particularly preferred that the drum comprise a hollow cylinder which is open at both ends.
For most applications it is desirable to remove both low and high density contraries. However, if it is desired to remove only less dense materials such as paper of plastics films the drum may be used on its own. The invention therefore provides a method of removing low density contraries from green waste, the method comprising tumbling the green waste in a drum which rotates about its longitudinal axis so that the waste is made to fall through the air inside the drum, whilst causing a stream of air to pass through the drum so as to carry low density materials such as paper or plastics films away from the falling waste.
The invention will now be further described, by way of example, with reference to the following drawing in which:
Figure 1 is a flow diagram for one embodiment of the
process of the present invention;
Figure 2 is a perspective view of apparatus for
carrying out the air separation step of the process
of the present invention;
Figure 3 is a perspective view of part of the
apparatus for carrying out the water separation step
of the process of the present invention; and
Figure 4 is a perspective view similar to that of
Figure 3, showing a pair of paddles in use with the
apparatus.
The apparatus shown in Figure 1 comprises a drum which is rotatable about its longitudinal axis, a water tank which receives green waste from the drum, and a plurality of bins for receiving different components and contraries present in the waste.
The apparatus also includes an optional rotary screen for removing components in the waste which have dimensions greater than about 60 mm, before the waste enters the drum. The rotary screen comprises a plurality of rubber star-shaped wheels which are spaced apart from one another and rotated so as to move bulky objects along to a bin for removal. Green waste is fed from a hopper onto the rotary screen. Components of the green waste which are smaller than about 60 mm fall between the star wheels onto a conveyor belt 22 which feeds them into the drum 24.
The drum 24 is a hollow cylinder which is open at both ends. The longitudinal axis of the drum is angled to the horizontal by about 20 so that waste which is fed into the upper end progresses through the drum as it rotates and passes through the lower (exit) end where it is conveyed to the water tank 6. The drum 24 is about 6 meters long, and has an internal diameter of about 1.2 meters. It is rotated at about 21 rpm and has an hourly throughput of around 15 m3. These figures are given by way of illustration, and do not limit the invention in any way.
Located at the exit end of the drum 24, a fan 30 pulls air through the drum so that less dense materials such as paper or plastics films are carried by the stream of air via a conduit 34 to a collection bin for removal. The blades 32 of the fan 30 have a span which is similar to the internal diameter of the drum 24 to help promote laminar air flow within the drum. The fan 30 is similar to an aeroplane propeller, having a conical nose; we have found this type of fan is particularly effective in avoiding fouling by the paper or plastics films which pass through it. The fan may be rotated at any suitable speed which suffices to effect separation of the paper and plastics film components. The exact speed will depend on the nature and moisture content of the waste, but will typically be in the range 100 to 900 rpm.We have found that a speed of 150 to 250 rpm, and particularly about 200 rpm, works effectively for typical green wastes, although the invention is not limited to operation of the fan at this speed.
The drum 24 is perforated along its length, and components of the green waste which are of suitable size pass through the perforations as the waste progresses through the drum.
The drum 24 is divided into two regions 26 and 28, each of which has perforations of a different size. The perforations in region 26, by the entrance to the drum, allow components smaller than about 5 mm to pass through, where they are collected in a container 36.
The perforations in region 28 are larger, and allow components smaller than about 14 mm to pass through. The smallest components have already been lost through the perforations in region 26, so components in the approximate size range 5 to 14 mm pass through the perforations in region 28 onto a chute 4.
Components in the approximate size range 14 to 60 mm drop out the exit end of the drum 24 onto a chute 2.
Waste which exits the drum enters the water tank 6, and dense contraries such as stones or glass sink to the bottom of the water where they are removed by a conveyor belt 16 to a bin 20. The conveyor belt 16 is provided with chevron structures 18 to help retain the pieces of stone or glass which are carried from the water.
Either of chutes 2 and 4 may optionally be replaced by a conveyor if desired.
Different size ranges of waste are carried into the water tank 6 by the chutes 4 and 2, and these ranges are correspondingly removed from the water tank 6 by conveyor belts 10 and 8. The belts 8 and 10 may be separate from one another, or they may comprise a single belt with a gap or spacer down the middle.
A pair of rotating paddles 38 (shown in Figure 4) are positioned in the water in between each chute (4, 2) and its corresponding conveyor belt (10, 8), above the conveyor belt 16 which carries away the stone and glass.
The paddles 38 act to convey the waste through the water from one chute (4, 2) to the corresponding conveyor (10, 8), so that the different sizes of waste material remain substantially segregated. The waste is finally deposited from each conveyor (10, 8) into a corresponding collection bin (14, 12).
The waste which is collected from the bins 14 and 12 may be used immediately as a mulch. The fine waste particles collected in the bin 36 may be used immediately as a turf dressing or a soil conditioner. However if it is desired to remove small stones or pieces of glass from these fine particles, this may be achieved by a water separation process similar to that described above.
For economic, environmental, or other reasons it is preferred that the water is recycled during the washing stage. This may be readily achieved by conventional means by the use of a pump. A removable in-line filter may also be provided to collect soil or other residues which accumulate in the water.
The invention therefore provides an effective and simple method for removing both low density and high density contraries from green waste.
It is to be understood that although the invention has been illustrated with reference to a specific embodiment, it is not limited to this embodiment, and many changes may be made which are within the scope of the invention as defined by the claims. For example the invention has been described for simplicity with reference to the collection of waste components or contraries in bins; they may however be arranged in piles for collection or disposal in any suitable container or on the ground.
Reference to conveyor belts or chutes are for the purposes of illustration only and it is to be understood that any suitable conveying means may be used having regard to the specific design of apparatus which is used to carry out the process.
Claims (15)
1. A method of removing contraries from green waste, the method comprising the steps of: a. tumbling the green waste in a drum which rotates
about its longitudinal axis so that the waste is made
to fall through the air inside the drum, whilst
causing a stream of air to pass through the drum so
as to carry low density materials such as paper or
plastics films away from the falling waste;
and b. causing the green waste to move through water so that
lower density materials are carried in the water and
higher density materials such as stones and glass
fall through the water.
2. A method as claimed in Claim 1, wherein the longitudinal axis of the drum is angled to the horizontal at an angle in the range 0.5 to 5 .
3. A method as claimed in Claim 1, wherein the longitudinal axis of the drum is angled to the horizontal at an angle of about 20.
4. A method as claimed in any one of the preceding claims, wherein the drum is rotated at about 10 to 30 rpm.
5. A method as claimed in Claim 4, wherein the drum is rotated at about 20 rpm.
6. A method as claimed in any one of the preceding claims, further including the step of screening the waste to remove components above a predetermined size limit prior to step a.
7. A method as claimed in Claim 6, wherein the size limit is about 60 mm.
8. A method as claimed in any one of the preceding claims, wherein the waste is separated into components having a plurality of different size ranges prior to step b.
9. A method as claimed in Claim 8, wherein the separation is carried out by means of different sized perforations in the drum.
10. A method as claimed in any one of the preceding claims, wherein the air is pulled through the drum by means of a fan.
11. A method as claimed in Claim 10, wherein the drum is a hollow cylinder, and the wherein the span of the blades of the fan is substantially equal to the internal diameter of the cylinder.
12. Apparatus for carrying out the method of any one of the preceding claims, comprising: a. a drum having an entrance at one end and an exit at
the other, rotatable about its longitudinal axis; b. means for causing a stream of air to pass through the
drum; c. means for washing the waste with water so that the
more dense components fall through the water and the
less dense components are carried in the water; and d. means for conveying waste from the drum to the
washing means.
13. Apparatus as claimed in Claim 12, wherein the drum is perforated and the perforations are of different sizes in different regions of the drum.
14. Apparatus for removing contraries from green waste substantially as herein described with reference to and as shown in any one of the figures of the drawing.
15. A method for removing contraries from green waste substantially as herein described with reference to the drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9601592A GB2309401A (en) | 1996-01-26 | 1996-01-26 | Removal of contraries from green waste |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9601592A GB2309401A (en) | 1996-01-26 | 1996-01-26 | Removal of contraries from green waste |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9601592D0 GB9601592D0 (en) | 1996-03-27 |
| GB2309401A true GB2309401A (en) | 1997-07-30 |
Family
ID=10787622
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9601592A Withdrawn GB2309401A (en) | 1996-01-26 | 1996-01-26 | Removal of contraries from green waste |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2309401A (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2009627A (en) * | 1977-12-08 | 1979-06-20 | Kelsey Hayes Co | Classifying Particulate Material |
| GB1571020A (en) * | 1976-03-24 | 1980-07-09 | Cargill Inc | Method and apparatus for processing refuse |
| GB1599547A (en) * | 1978-05-25 | 1981-10-07 | Motherwell Bridge Tacol Ltd | Air classification apparatus |
| GB2078138A (en) * | 1980-06-21 | 1982-01-06 | Kloeckner Humboldt Deutz Ag | "Sink-float" separation of plastics from waste material |
| GB2137535A (en) * | 1983-03-29 | 1984-10-10 | Thomas Edward Williams | Separator |
| US5022982A (en) * | 1989-01-13 | 1991-06-11 | Cpm Energy Systems Corporation | Rotary drum solid waste air classifier |
| US5025929A (en) * | 1989-08-07 | 1991-06-25 | Sorain Cecchini Recovery, Incorporated | Air classifier for light reusable materials separation from a stream of non-shredded solid waste |
| US5091077A (en) * | 1990-10-09 | 1992-02-25 | Williams Robert M | Trommel material air classifier |
| GB2248031A (en) * | 1990-09-19 | 1992-03-25 | Yakuzky Ni I Pi Almazodobyva | Flotation machine |
| EP0561731A1 (en) * | 1992-03-16 | 1993-09-22 | Tim Maskinfabrik A/S | Plant, in particular for sorting household waste |
| EP0565038A1 (en) * | 1992-04-10 | 1993-10-13 | HORSTMANN GmbH & CO. KG | Method and device for sorting refuse |
-
1996
- 1996-01-26 GB GB9601592A patent/GB2309401A/en not_active Withdrawn
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1571020A (en) * | 1976-03-24 | 1980-07-09 | Cargill Inc | Method and apparatus for processing refuse |
| GB2009627A (en) * | 1977-12-08 | 1979-06-20 | Kelsey Hayes Co | Classifying Particulate Material |
| GB1599547A (en) * | 1978-05-25 | 1981-10-07 | Motherwell Bridge Tacol Ltd | Air classification apparatus |
| GB2078138A (en) * | 1980-06-21 | 1982-01-06 | Kloeckner Humboldt Deutz Ag | "Sink-float" separation of plastics from waste material |
| GB2137535A (en) * | 1983-03-29 | 1984-10-10 | Thomas Edward Williams | Separator |
| US5022982A (en) * | 1989-01-13 | 1991-06-11 | Cpm Energy Systems Corporation | Rotary drum solid waste air classifier |
| US5025929A (en) * | 1989-08-07 | 1991-06-25 | Sorain Cecchini Recovery, Incorporated | Air classifier for light reusable materials separation from a stream of non-shredded solid waste |
| GB2248031A (en) * | 1990-09-19 | 1992-03-25 | Yakuzky Ni I Pi Almazodobyva | Flotation machine |
| US5091077A (en) * | 1990-10-09 | 1992-02-25 | Williams Robert M | Trommel material air classifier |
| EP0561731A1 (en) * | 1992-03-16 | 1993-09-22 | Tim Maskinfabrik A/S | Plant, in particular for sorting household waste |
| EP0565038A1 (en) * | 1992-04-10 | 1993-10-13 | HORSTMANN GmbH & CO. KG | Method and device for sorting refuse |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9601592D0 (en) | 1996-03-27 |
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