AU2013207312B2 - Processing of pre-treated mixed waste - Google Patents
Processing of pre-treated mixed waste Download PDFInfo
- Publication number
- AU2013207312B2 AU2013207312B2 AU2013207312A AU2013207312A AU2013207312B2 AU 2013207312 B2 AU2013207312 B2 AU 2013207312B2 AU 2013207312 A AU2013207312 A AU 2013207312A AU 2013207312 A AU2013207312 A AU 2013207312A AU 2013207312 B2 AU2013207312 B2 AU 2013207312B2
- Authority
- AU
- Australia
- Prior art keywords
- screen
- residual material
- maximum dimension
- openings
- less
- 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
Links
- 238000012545 processing Methods 0.000 title claims abstract description 14
- 239000010812 mixed waste Substances 0.000 title claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 71
- 238000000034 method Methods 0.000 claims abstract description 33
- 239000002245 particle Substances 0.000 claims abstract description 14
- 238000011282 treatment Methods 0.000 claims abstract description 9
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 8
- 239000011521 glass Substances 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000004033 plastic Substances 0.000 claims description 11
- 229920003023 plastic Polymers 0.000 claims description 11
- 239000002985 plastic film Substances 0.000 claims description 8
- 229920006255 plastic film Polymers 0.000 claims description 8
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 4
- 238000012216 screening Methods 0.000 claims description 4
- 239000002699 waste material Substances 0.000 description 6
- 239000000446 fuel Substances 0.000 description 3
- 238000005067 remediation Methods 0.000 description 3
- 239000002361 compost Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000012958 reprocessing Methods 0.000 description 2
- 241001465754 Metazoa Species 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/16—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts
- B03C1/22—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts with non-movable magnets
-
- 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
- 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
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
-
- 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
-
- 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
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C2201/00—Details of magnetic or electrostatic separation
- B03C2201/20—Magnetic separation of bulk or dry particles in mixtures
-
- 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
Landscapes
- Processing Of Solid Wastes (AREA)
- Combined Means For Separation Of Solids (AREA)
Abstract
Disclosed herein is a processing plant (10) and a method for processing residual material from upstream mixed waste treatment processes. The plant (10) a comminutor, preferably in the form of a flail mill (12), for comminuting residual material input into the plant to reduce its average particle size. Downstream of the flail mill (12) is a first screen (14) having openings with a maximum dimension of less than around 30mm. A second vibratory mesh screen (16) may be provided downstream of the first screen (14) to screen material that is caught by the first screen (14). The second screen (16) may have openings with a greater maximum dimension than that of the first screen (14). Conveyors, such as continuous belt conveyors (18) and augers (20), may be provided to move material through the plant (10).
Description
"Processing of pre-treated mixed waste"
The present disclosure relates to processing of residuals from upstream mixed waste treatment processes, such as municipal waste, commercial and industrial waste, and contaminated food and green waste treatment processes, that would otherwise go to landfill. The process disclosed herein has been developed particularly for the production of material that is suitable for use in agriculture and/or in the remediation of mine sites.
Mixed waste is typically processed by a variety of to classify the waste into various fractions, each of which may be subjected to specific treatments. For example, the waste may be sorted using a combination of manual sorting, size-based sorting, density-based sorting, and metal-based sorting. Recyclable materials, such as plastics, metals and paper-based products recovered by the sorting are typically recycled. The waste often also includes a relatively large proportion of organic material and other materials not suitable for recycling. The organics are typically treated by digestion, screening and drying.
The non-recyclable "dry" material remaining as a residual after the aforementioned processes is typically sent to landfill, which is undesirable. The residual material typically includes glass residuals and mixed "dry" organic residuals containing glass/metal/plastics (GMP). However, the residual material is typically free from larger particles, which are generally removed by upstream processes including screening with screens having openings of around 50mm. It would be advantageous if the residual material could be further treated to render it suitable for recycling or re-use.
Any discussion of documents, acts, materials, devices, articles or the like which has been included in the present specification is not to be taken as an admission that any or all of these matters form part of the prior art base or were common general knowledge in the field relevant to the present invention as it existed before the priority date of each claim of this application.
Throughout this specification the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps.
In a first aspect, the present disclosure provides a method of processing residual material from upstream mixed waste treatment processes, said method comprising: comminuting the residual material to reduce the average size of particles contained in the residual material; and screening the comminuted residual material with a first screen having openings with a maximum dimension of less than around 30mm, wherein residual material caught by the first screen is passed through a second screen having openings of greater maximum dimension than the openings of the first screen, material passing the second screen being returned to the comminuting step and material caught by the second screen being directed to another process.
Said another process may be for use as fuel or for disposal.
The first screen may have openings with a maximum dimension of less than around 20mm, less than around 12mm, less than around 10mm, or of around 5mm.
The first screen may be a mesh having rectangular or square openings. Alternatively, the first screen may have circular openings. The first screen may be vibratory or rotary.
Prior to the comminuting step, the residual material may be subjected to a magnetic field to remove ferrous material.
The comminuting step may comprise passing the residual material through a mill. The mill may, for example, be a ripple mill, a hammer mill or a flail mill.
Residual material passing the first screen may comprise less than 2.5 dry weight percent of glass, metal and rigid plastics having a maximum dimension greater than 2mm. Such glass, metal and rigid plastics may be of a size, shape (e.g. glass shards), or type that might cause damage or injury to humans, animals, plants or soil. Residual material passing the first screen may comprise less than 1.5 dry weight percent of glass, metal and rigid plastics having a maximum dimension greater than 2mm.
Residual material passing the first screen may comprise less than 0.25 dry weight percent of plastic film having a maximum dimension greater than 5mm. Residual material passing the first screen may comprise less than 0.2 dry weight percent of plastic film having a maximum dimension greater than 5mm.
Residual material passing the first screen may have a maximum particle size of 16mm.
Residual material passing the first screen may be stored for use in agriculture and/or in the remediation of mine sites. Residual material passing the first screen may be mixed with other material, such as compost, to produce a product comprising less than 2.5 dry weight percent of glass, metal and rigid plastics having a maximum dimension greater than 2mm. The product may comprise less than 1.5 dry weight percent of glass, metal and rigid plastics having a maximum dimension greater than 2mm. The product may comprise less than 0.25 dry weight percent of plastic film having a maximum dimension greater than 5mm. The product may comprise less than 0.2 dry weight percent of plastic film having a maximum dimension greater than 5mm. The product may have a maximum particle size of no more than 16mm.
In another aspect, there may be provided a system for performing the method of the first aspect above, said system comprising: a comminutor for performing said comminuting step; and a said first screen having openings with a maximum dimension of less than around 30mm; and a said second screen having openings of greater maximum dimension than the openings of the first screen.
Embodiments of the presently disclosed method and system will now be described by way of example only, with reference to the accompanying representations, in which:
Fig. 1 is a schematic illustration of a processing plant for processing residual material from upstream mixed waste treatment processes;
Fig. 2 is a photograph of residual material for input into the processing plant of
Fig. 1;
Fig. 3 is a photograph of residual material rejected by the second screen of the processing plant of Fig. 1; and
Fig. 4 is a photograph of product produ ced by the processing plant of Fig. 1.
Referring to the representations, and initially to Fig. 1, there is shown a system, in the form of a processing plant 10, for performing a method of processing residual material from upstream mixed waste treatment processes. The plant 10 comprises a magnet 11 for creating a magnetic field to remove ferrous material from feed residual material. Downstream of the magnet 11 is a comminutor, in the form of a flail mill 12, for comminuting residual material input into the plant to reduce its average particle size. Downstream of the flail mill 12 is a first vibratory mesh screen 14 having openings of around 5mm x 5mm. A second vibratory mesh screen 16 is provided downstream of the first screen to screen material that is caught by the first screen 14. The second screen has openings of around 12mm x 12mm. Conveyors, such as continuous belt conveyors 18 and augers 20, are provided to move material through the plant 10.
In use, residual material from an upstream waste treatment process is fed into the plant 10. A photograph of typical residual material fed into the plant 10 is shown in Fig. 2. The residual material fed into the plant 10 is moved by a conveyor 18 through a magnetic field generated by the magnet 11 to remove ferrous material from the residual material. The residual material then passes on to the flail mill 12, which comminutes the residual material to reduce its average particle size. After passing through the flail mill 12, the residual material is screened by the first screen 14. Residual material that is caught by the first screen 14 is returned to the flail mill 12 for reprocessing. Prior to being returned to the flail mill 12, however, the residual material caught by the first screen 14 is passed through the second screen 16 to remove larger particles. Any such larger particles which do not pass the second screen 16 are sent to landfill or packaged for use as fuel. A photograph of typical material caught by the second screen 16 is shown in Fig. 3.
Residual material passing the first screen 14 has been found to comprise less than 2.5 dry weight percent of glass, metal and rigid plastics having a maximum dimension greater than 2mm, zero dry weight percent of plastic film having a maximum dimension greater than 5mm and a maximum particle size of no more than 16mm.
Residual material passing the first screen 14 may be stored for use in agriculture and/or in the remediation of mine sites. Depending on its intended use, residual material passing the first screen 14 may be mixed with other material, such as refined compost, to produce a product comprising, for example, less than 1.5 dry weight percent of glass, metal and rigid plastics having a maximum dimension greater than 2mm, zero dry weight percent of plastic film and a maximum particle size of no more than 16mm.
It will be appreciated by persons skilled in the art that numerous variations and/or modifications may be made to the above-described embodiments, without departing from the broad general scope of the present disclosure. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive. Examples of possible modifications and/or variations include, but are not limited to: • replacing the flail mill 12 with another type of comminutor, such as a hammer mill or a ripple mill; • omitting the second screen and instead sending residual material that does not pass the first screen to another process (eg. land fill or for use as fuel) or returning the material to the mill 12 for reprocessing; optionally in combination with a finer first screen; • using a finer or coarser first screen to produce a product with different characteristics; • using other types of screens for the first and/or second screens, such as trommels or non-vibratory screens; and/or • omitting the magnet 11.
Claims (12)
- CLAIMS:1. A method of processing residual material from upstream mixed waste treatment processes, said method comprising: comminuting the residual material to reduce the average size of particles contained in the residual material; and screening the comminuted residual material with a first screen having openings with a maximum dimension of less than around 30mm, wherein residual material caught by the first screen is passed through a second screen having openings of greater maximum dimension than the openings of the first screen, material passing the second screen being returned to the comminuting step and material caught by the second screen being directed to another process.
- 2. A method according to claim 1, wherein the first screen comprises openings with a maximum dimension of less than around 20mm, less than around 12mm, less than around 10mm, or of around 5mm.
- 3. A method according to claim 1 or claim 2, wherein, prior to the comminuting step, the residual material is subjected to a magnetic field to remove ferrous material.
- 4. A method according to any one of the preceding claims, wherein the comminuting step comprises passing the residual material through a mill.
- 5. A method according to claim 4, wherein the mill is a flail mill.
- 6. A method according to any one of the preceding claims, wherein residual material passing the first screen comprises less than 2.5 dry weight percent of glass, metal and rigid plastics having a maximum dimension greater than 2mm.
- 7. A method according to any one of the preceding claims, wherein residual material passing the first screen comprises less than 0.25 dry weight percent of plastic film having a maximum dimension greater than 5mm.
- 8. A method according to any one of the preceding claims, wherein residual material passing the first screen has a maximum particle size of no more than 16mm.
- 9. A method according to any one of the preceding claims, wherein residual material passing the first screen is mixed with other material to produce a product comprising less than 2.5 diy weight percent of glass, metal and rigid plastics having a maximum dimension greater than 2mm.
- 10. A method according to claim 9, wherein the product comprises less than 0.25 dry weight percent of plastic film having a maximum dimension greater than 5mm.
- 11. A method according to claim 9 or claim 10, wherein the product has a maximum particle size of no more than 16mm.
- 12. A system when used in the method of any one of the preceding claims, said system comprising: a comminutor for performing said comminuting step; and a said first screen having openings with a maximum dimension of less than around 30mm; and a said second screen having openings of greater maximum dimension than the openings of the first screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2013207312A AU2013207312B2 (en) | 2012-01-03 | 2013-01-02 | Processing of pre-treated mixed waste |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2012900013 | 2012-01-03 | ||
| AU2012900013A AU2012900013A0 (en) | 2012-01-03 | Processing of pre-treated mixed waste | |
| PCT/AU2013/000001 WO2013102240A1 (en) | 2012-01-03 | 2013-01-02 | Processing of pre-treated mixed waste |
| AU2013207312A AU2013207312B2 (en) | 2012-01-03 | 2013-01-02 | Processing of pre-treated mixed waste |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2013207312A1 AU2013207312A1 (en) | 2014-08-21 |
| AU2013207312B2 true AU2013207312B2 (en) | 2017-10-19 |
Family
ID=48744928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2013207312A Ceased AU2013207312B2 (en) | 2012-01-03 | 2013-01-02 | Processing of pre-treated mixed waste |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU2013207312B2 (en) |
| WO (1) | WO2013102240A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109453858A (en) * | 2018-11-06 | 2019-03-12 | 大余县萤通工贸有限公司 | A kind of particle collection for fluorite production is returned and uses device |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104174861A (en) * | 2014-07-09 | 2014-12-03 | 邱建彪 | Comprehensive recycling process of second zinc oxide rotary kiln tailings and production line of comprehensive recycling process |
| CN111514990B (en) * | 2020-04-29 | 2021-04-30 | 湖南金弘再生资源集团有限公司 | Comprehensive utilization, treatment and processing system and method for steel-making waste steel slag |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2426004A (en) * | 2005-05-13 | 2006-11-15 | Design Build And Recycle Ltd | Process for treating waste |
-
2013
- 2013-01-02 AU AU2013207312A patent/AU2013207312B2/en not_active Ceased
- 2013-01-02 WO PCT/AU2013/000001 patent/WO2013102240A1/en active Application Filing
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2426004A (en) * | 2005-05-13 | 2006-11-15 | Design Build And Recycle Ltd | Process for treating waste |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109453858A (en) * | 2018-11-06 | 2019-03-12 | 大余县萤通工贸有限公司 | A kind of particle collection for fluorite production is returned and uses device |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2013207312A1 (en) | 2014-08-21 |
| WO2013102240A1 (en) | 2013-07-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| HB | Alteration of name in register |
Owner name: SUEZ RECYCLING & RECOVERY PTY LTD Free format text: FORMER NAME(S): SITA AUSTRALIA PTY LTD |
|
| FGA | Letters patent sealed or granted (standard patent) | ||
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |