EP0302551A2 - Process and equipment for the treatment of solid urban wastes - Google Patents
Process and equipment for the treatment of solid urban wastes Download PDFInfo
- Publication number
- EP0302551A2 EP0302551A2 EP88201582A EP88201582A EP0302551A2 EP 0302551 A2 EP0302551 A2 EP 0302551A2 EP 88201582 A EP88201582 A EP 88201582A EP 88201582 A EP88201582 A EP 88201582A EP 0302551 A2 EP0302551 A2 EP 0302551A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- materials
- grinding
- wastes
- mill
- grid
- 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- Withdrawn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
- 239000002699 waste material Substances 0.000 title claims abstract description 18
- 239000007787 solid Substances 0.000 title claims abstract description 11
- 238000011282 treatment Methods 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000000926 separation method Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 40
- 239000004033 plastic Substances 0.000 description 8
- 229920003023 plastic Polymers 0.000 description 8
- 239000005416 organic matter Substances 0.000 description 5
- 239000011521 glass Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000011368 organic material Substances 0.000 description 3
- 238000009264 composting Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000000123 paper Substances 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000031018 biological processes and functions Effects 0.000 description 1
- 239000004600 biostabiliser Substances 0.000 description 1
- 239000011111 cardboard Substances 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/007—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls specially adapted for disintegrating refuse
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/04—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with unperforated container
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
- B02C17/18—Details
- B02C17/183—Feeding or discharging devices
- B02C17/1835—Discharging devices combined with sorting or separating of material
- B02C17/1855—Discharging devices combined with sorting or separating of material with separator defining termination of crushing zone, e.g. screen denying egress of oversize material
Definitions
- the present invention relates to the treatment of solid urban wastes and to the relevant equipment; in particular, the present invention is concerned with a process and an equipment suitable for grinding, homogenizing and blending the solid urban wastes.
- the solid urban wastes are generally constituted by a mixture of non-homogeneous substances.
- they comprise the fermentable organic matter, plastics, paper, metals, lithoidal materials, glasses, and so forth.
- the solid wastes undergo a grinding inside hammer mills or inside aerated rotary drums (biostabilizers) wherein the wastes remain for some days; the treated materials are subsequently submitted to sieving steps by means of rotary drum sieves, vibrating sieves, and so forth.
- the obtained organic matter has such a particle size, as not to make it possible an efficacious microbial attack to be carried out.
- the process of the present invention is accomplished by using a single equipment, which makes it possible the grinding, the homogenising and the sorting of the solid urban wastes to be carried out as one single step.
- the equipment used in the process of treatment of the solid urban wastes according to the invention is constituted by a rotary drum mill, fitted with a system for the separation of the ground and homogenised materials from the coarse materials, commonly denominated as poor-grindability materials.
- the grinding device is constituted by a cylindrical, horizontal, continuously-operating mill equipped with grinding bodies.
- the grinding bodies the mill is equipped with are constituted by bars.
- the grinding-body mill acts in a selective way on the biodegradable organic matter, which is finely ground and homogenized, whilst the hard plastic matters are left unchanged and can be easily separated from the biodegradable matter.
- the fine plastic material is only broken, and also it can be separated from the fermentable organic material.
- glass, and the lithoidal materials are finely ground and homogenized with the fermentable material.
- the grinding-body mill is fitted with a system for the continuous separation of the processed materials.
- the horizontal-body mill is provided with a wall perpendicular to the revolution axis, which is constituted by a grid which allows the finely ground material (the fermentable organic material), but not the plastic materials (poor-grindability materials), to pass through.
- a diaphragm is provided, which enables all materials submitted to grinding, but not the grinding bodies, to pass through.
- the coarser materials can be submitted to a further sieving, in order to separate the entrained finer materials, in an equipment outside the grinding-body mill.
- the grinding-body mill is indicated, wherein such a mill has a cylindrical shape, with a base diameter longer than the cylinder height.
- the diaphragm is indicated, which makes it possible the ground material, but not the grinding bodies, to pass through, wherein said grinding bodies can be constituted by cylinders or balls made from a high-hardness metal material.
- the grid is indicated, which makes it possible the finely ground material to pass through, with the coarse material being retained.
- the finely ground material leaves the mill through the duct 4 coaxial with the axis of the mill, whilst poor-grindability materials flow through the inner duct 5 to the rotary sieve 6 wherein they are separated from the entrained fine materials, and are discharged through the line 7.
- baffles are installed inside the air gaps between the diaphragm and the grid, and between the grid and the discharge head, baffles are installed, which convey the material towards the axis of the mill and towards the discharge thereof.
- biodegradable, finely ground organic matter After the grinding of the wastes, amounts of biodegradable, finely ground organic matter can be recovered, which are comprised within the range of from 50 to 60%.
- the organic substances recovered and separated from the poor-grindability materials can be submitted to the biological processes of composting or of anaerobic digestion.
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Processing Of Solid Wastes (AREA)
- Crushing And Grinding (AREA)
- Disintegrating Or Milling (AREA)
- Fertilizers (AREA)
Abstract
Description
- The present invention relates to the treatment of solid urban wastes and to the relevant equipment; in particular, the present invention is concerned with a process and an equipment suitable for grinding, homogenizing and blending the solid urban wastes.
- The solid urban wastes are generally constituted by a mixture of non-homogeneous substances. In particular, they comprise the fermentable organic matter, plastics, paper, metals, lithoidal materials, glasses, and so forth.
- For a rational treatment of the wastes, it is therefore necessary to carry out a preliminary sorting of the same wastes, in order to recover those materials which can be recycled (paper, metals, plastics), to carry out the composting in order to recover and exploit the interesting products at an agronomical level, and to incinerate the coarse plastic materials in order to recover heat and produce steam and electrical power.
- At present, several steps of treatment of the solid urban wastes are necessary.
- In particular, in a first treatment step, the solid wastes undergo a grinding inside hammer mills or inside aerated rotary drums (biostabilizers) wherein the wastes remain for some days; the treated materials are subsequently submitted to sieving steps by means of rotary drum sieves, vibrating sieves, and so forth.
- These processes known in the art suffer from some disadvantages deriving from the wear of the hammer grinders, and from the poor efficacy thereof. In fact, on one hand the inert materials, such as the lithoidal materials and glass remain in a coarse form, and must be removed; the plastic materials are ground and are difficult to separate from the fermentable organic matter.
- Furthermore, the obtained organic matter has such a particle size, as not to make it possible an efficacious microbial attack to be carried out.
- Furthermore, the drawback exists, that the sequence of the steps renders the treatment long and complex.
- The present Applicant has found now that the above exposed drawbacks can be overcome by performing both the grinding and the preliminary treatment and sorting of the wastes as one single step.
- The process of the present invention is accomplished by using a single equipment, which makes it possible the grinding, the homogenising and the sorting of the solid urban wastes to be carried out as one single step.
- The equipment used in the process of treatment of the solid urban wastes according to the invention is constituted by a rotary drum mill, fitted with a system for the separation of the ground and homogenised materials from the coarse materials, commonly denominated as poor-grindability materials.
- According to a form of practical embodiment of the invention, the grinding device is constituted by a cylindrical, horizontal, continuously-operating mill equipped with grinding bodies.
- According to a still more preferred form of practical embodiment, the grinding bodies the mill is equipped with, are constituted by bars.
- The grinding-body mill acts in a selective way on the biodegradable organic matter, which is finely ground and homogenized, whilst the hard plastic matters are left unchanged and can be easily separated from the biodegradable matter. The fine plastic material is only broken, and also it can be separated from the fermentable organic material. On the other hand, glass, and the lithoidal materials are finely ground and homogenized with the fermentable material.
- According to a preferred form of practical embodiment of the present invention, the grinding-body mill is fitted with a system for the continuous separation of the processed materials. In particular, the horizontal-body mill is provided with a wall perpendicular to the revolution axis, which is constituted by a grid which allows the finely ground material (the fermentable organic material), but not the
plastic materials (poor-grindability materials), to pass
through. In front of the side of the grid directed towards the interior of the drum, a diaphragm is provided, which enables all materials submitted to grinding, but not the grinding bodies, to pass through. - According to this preferred form of practical embodiment of the invention, two separate streams of materials continuously come out of the grinding-body mill.
- The coarser materials can be submitted to a further sieving, in order to separate the entrained finer materials, in an equipment outside the grinding-body mill.
- In the hereto attached, hereinunder discussed figure, a device is depicted, which makes it possible the process according to the invention to be practiced.
- In the Figure, by the
reference numeral 1 the grinding-body mill is indicated, wherein such a mill has a cylindrical shape, with a base diameter longer than the cylinder height. By thereference numeral 2, the diaphragm is indicated, which makes it possible the ground material, but not the grinding bodies, to pass through, wherein said grinding bodies can be constituted by cylinders or balls made from a high-hardness metal material. By thereference numeral 3, the grid is indicated, which makes it possible the finely ground material to pass through, with the coarse material being retained. The finely ground material leaves the mill through theduct 4 coaxial with the axis of the mill, whilst poor-grindability materials flow through theinner duct 5 to therotary sieve 6 wherein they are separated from the entrained fine materials, and are discharged through theline 7. - Inside the air gaps between the diaphragm and the grid, and between the grid and the discharge head, baffles are installed, which convey the material towards the axis of the mill and towards the discharge thereof.
- By means of such an equipment as shown in figure, treatments were carried out of solid urban wastes, which contained 45% of moisture, and had the following average composition, relatively to the dry matter:
- Paper and cardboard 22%
- Textile materials andwood 5%
- Plastic materials 9%
-Metals 3%
- Inert materials (glass and lithoidal materials) 7%
- Sundry organic materials 36%
- Undersize (20 x 20 mm) 18% - After the grinding of the wastes, amounts of biodegradable, finely ground organic matter can be recovered, which are comprised within the range of from 50 to 60%.
- The organic substances recovered and separated from the poor-grindability materials can be submitted to the biological processes of composting or of anaerobic digestion.
Claims (6)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT2161987 | 1987-08-07 | ||
IT8721619A IT1228926B (en) | 1987-08-07 | 1987-08-07 | PROCEDURE AND EQUIPMENT FOR THE TREATMENT OF URBAN SOLID WASTE |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0302551A2 true EP0302551A2 (en) | 1989-02-08 |
EP0302551A3 EP0302551A3 (en) | 1990-01-10 |
Family
ID=11184417
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88201582A Withdrawn EP0302551A3 (en) | 1987-08-07 | 1988-07-21 | Process and equipment for the treatment of solid urban wastes |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0302551A3 (en) |
JP (1) | JPS6451184A (en) |
IT (1) | IT1228926B (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4995561A (en) * | 1989-02-23 | 1991-02-26 | Nakaya Jitsugyo Co., Ltd. | Ground sand maker |
EP0876844A2 (en) * | 1997-05-06 | 1998-11-11 | Hans Dr.-Ing. Friedmann | Method and apparatus for treating waste |
FR2964576A1 (en) * | 2010-09-13 | 2012-03-16 | Alfyma Ind | IMPROVED WASTE TREATMENT FACILITY |
EP2907577A1 (en) * | 2014-02-13 | 2015-08-19 | Geisberger Gesellschaft für Energieoptimierung mbH | Device for biogas facilities for comminuting and milling of liquid-solid mixtures |
CN111013797A (en) * | 2019-12-17 | 2020-04-17 | 谭尚平 | Pop-top can crusher device capable of avoiding fragment blocking in sliding process |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB251564A (en) * | 1925-08-29 | 1926-05-06 | Peter Vilhelm Adolf Aage Herbs | Improvements relating to tube or ball mills |
DE499880C (en) * | 1928-03-16 | 1930-06-14 | Chr Pfeiffer | Transfer chamber with screening device for compound drum mills |
DE501537C (en) * | 1928-09-16 | 1930-07-03 | Act Ges Vorm Wagner & Co Masch | Ball and rod mill |
DE2254844A1 (en) * | 1972-11-09 | 1974-05-22 | Loesche Kg | METHOD AND EQUIPMENT FOR THE PROCESSING OF MUELL |
EP0003878A2 (en) * | 1978-02-27 | 1979-09-05 | F.L. Smidth & Co. A/S | Grinding tube mill |
-
1987
- 1987-08-07 IT IT8721619A patent/IT1228926B/en active
-
1988
- 1988-07-21 EP EP88201582A patent/EP0302551A3/en not_active Withdrawn
- 1988-08-02 JP JP63192188A patent/JPS6451184A/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB251564A (en) * | 1925-08-29 | 1926-05-06 | Peter Vilhelm Adolf Aage Herbs | Improvements relating to tube or ball mills |
DE499880C (en) * | 1928-03-16 | 1930-06-14 | Chr Pfeiffer | Transfer chamber with screening device for compound drum mills |
DE501537C (en) * | 1928-09-16 | 1930-07-03 | Act Ges Vorm Wagner & Co Masch | Ball and rod mill |
DE2254844A1 (en) * | 1972-11-09 | 1974-05-22 | Loesche Kg | METHOD AND EQUIPMENT FOR THE PROCESSING OF MUELL |
EP0003878A2 (en) * | 1978-02-27 | 1979-09-05 | F.L. Smidth & Co. A/S | Grinding tube mill |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4995561A (en) * | 1989-02-23 | 1991-02-26 | Nakaya Jitsugyo Co., Ltd. | Ground sand maker |
EP0876844A2 (en) * | 1997-05-06 | 1998-11-11 | Hans Dr.-Ing. Friedmann | Method and apparatus for treating waste |
EP0876844A3 (en) * | 1997-05-06 | 1999-05-12 | Hans Dr.-Ing. Friedmann | Method and apparatus for treating waste |
FR2964576A1 (en) * | 2010-09-13 | 2012-03-16 | Alfyma Ind | IMPROVED WASTE TREATMENT FACILITY |
WO2012035249A1 (en) | 2010-09-13 | 2012-03-22 | Alfyma Industrie | Improved installation for the treatment of waste |
EP2907577A1 (en) * | 2014-02-13 | 2015-08-19 | Geisberger Gesellschaft für Energieoptimierung mbH | Device for biogas facilities for comminuting and milling of liquid-solid mixtures |
CN111013797A (en) * | 2019-12-17 | 2020-04-17 | 谭尚平 | Pop-top can crusher device capable of avoiding fragment blocking in sliding process |
CN111013797B (en) * | 2019-12-17 | 2021-09-07 | 李恒赳 | Pop-top can crusher device capable of avoiding fragment blocking in sliding process |
Also Published As
Publication number | Publication date |
---|---|
IT8721619A0 (en) | 1987-08-07 |
EP0302551A3 (en) | 1990-01-10 |
IT1228926B (en) | 1991-07-10 |
JPS6451184A (en) | 1989-02-27 |
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17P | Request for examination filed |
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17Q | First examination report despatched |
Effective date: 19910628 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 19911109 |