WO2003006186A1 - Process for encapsulating a waste material - Google Patents
Process for encapsulating a waste material Download PDFInfo
- Publication number
- WO2003006186A1 WO2003006186A1 PCT/GB2002/003207 GB0203207W WO03006186A1 WO 2003006186 A1 WO2003006186 A1 WO 2003006186A1 GB 0203207 W GB0203207 W GB 0203207W WO 03006186 A1 WO03006186 A1 WO 03006186A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- waste material
- waste
- encapsulating
- treating
- liquid
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/20—Agglomeration, binding or encapsulation of solid waste
- B09B3/25—Agglomeration, binding or encapsulation of solid waste using mineral binders or matrix
Definitions
- the present invention relates to a process for encapsulating waste material.
- the present invention relates to a process for encapsulating an oleophilic waste material.
- waste materials with which the invention is primarily concerned include such materials present in a sludge.
- sludges which generally have no value, are generated in various industrial processes.
- a sludge consisting of an organic solvent and grease is produced when cleansing metal parts to remove grease, a waste material, therefrom.
- sludges may also be produced in the dye, ink and paint industries where dye, ink or paint is dissolved in an organic solvent; such organic solvents including chlorinated solvents, for example, trichloroethylene, perchlorethylene etc., or aromatic solvents, for example, toluene.
- organic solvents including chlorinated solvents, for example, trichloroethylene, perchlorethylene etc., or aromatic solvents, for example, toluene.
- European Patent No. 655,955 discloses a process for encapsulating waste material comprising the steps of providing the waste material in association with a vaporisable liquid, admixing the waste material/liquid composition with a particulate material, preferably, fly ash, and heating the admixture to remove the vaporizable liquid such that the waste material remains firmly bound within the particulate material.
- a particulate material preferably, fly ash
- a process for encapsulating waste material including the steps of: providing the waste material in association with a vaporisable liquid, admixing the waste material/liquid composition with a particulate material, preferably fly ash, and heating the admixture to remove the vaporizable liquid characterised in that the process further includes the step of pre-treating the waste material ultrasonically.
- a process in accordance with the present invention at least addresses the problems outlined above in that the step of pre-treating the waste material ultrasonically produces a slurry of smaller particle size, preferably below 5 microns, thereby making same suitable for use in encapsulating heavy metal waste materials.
- FIG. 1 is a schematic diagram of a process plant suitable for carrying out the process of the present invention.
- a sludge of variable particle size or dried material waste is delivered into vessel 1 via valve V2.
- the sludge is then mixed with a suitable solvent, such as toluene, by opening valve V1 , preferably at a dilution rate of between 1 to 10.
- the agitator 2 is started and the solvent is allowed to mix with the waste material.
- valve V3 is opened and the pump 3 is started.
- the pump 3 may be a simple slurry pump, jet pump, inductor or other hydro-transport device, which may need a transport medium, such as a further solvent, fed into it at pressure via valve V8. It is to be understood that in the case of large material, a maceration pump may be used.
- Valves V4 and V6 are then opened and once re-circulation is established, an ultrasonic processor 4, preferably of the type disclosed in PCT GB96/01612, is actuated and the waste material is re-circulated until the slurry is suitably deaglomerated for encapsulation. This can be assessed by taking samples via sample plant valve V7.
- V4 is closed and V5 is opened with V3, V6, V1 and V5 open.
- the system can be purged of any solids prior to a plant or system shut-down and the treated waste material is transferred for encapsulation as described in European Patent No. 0,655,955.
- pump 3 may be replaced by a fluidising unit 5 which can act as a slurry transport system to either recirculate the waste material through the ultrasonic processor unit 4 and/or purge the system with solvent with all valves to vessel 1 closed and the valves to the fluidising unit 5 open.
- a fluidising unit 5 which can act as a slurry transport system to either recirculate the waste material through the ultrasonic processor unit 4 and/or purge the system with solvent with all valves to vessel 1 closed and the valves to the fluidising unit 5 open.
- waste paint, ink dyes, sludge and dry solids waste paint, ink dyes, sludge and dry solids
- tar sludge and solids waste hydrocarbon sludges and solid waste
- textile waste sludges metal waste sludges
- solvent degreasing sludges dry cleaning sludges
- radioactive sludges petrochemical sludges
- waste incinerator ash waste incinerator fume scrubber materials
- removal of hydrocarbon on fire ash to cement industries waste based toxic sludges.
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
A process for encapsulating waste material includes the steps of: providing the waste material in association with a vaporisable liquid, admixing the waste material/liquid composition with a particulate material, preferably fly ash, and heating the admixture to remove the vaporisable liquid characterised in that the process further includes the step of pre-treating the waste material ultrasonically (4).
Description
PROCESS FOR ENCAPSULATING A WASTE MATERIAL
The present invention relates to a process for encapsulating waste material. In particular, the present invention relates to a process for encapsulating an oleophilic waste material.
Examples of waste materials with which the invention is primarily concerned include such materials present in a sludge.
As will be appreciated, sludges, which generally have no value, are generated in various industrial processes. For example, a sludge consisting of an organic solvent and grease is produced when cleansing metal parts to remove grease, a waste material, therefrom.
In addition, sludges may also be produced in the dye, ink and paint industries where dye, ink or paint is dissolved in an organic solvent; such organic solvents including chlorinated solvents, for example, trichloroethylene, perchlorethylene etc., or aromatic solvents, for example, toluene.
European Patent No. 655,955 discloses a process for encapsulating waste material comprising the steps of providing the waste material in association with a vaporisable liquid, admixing the waste material/liquid composition with a particulate material, preferably, fly ash, and heating the admixture to remove the vaporizable liquid such that the waste material remains firmly bound within the particulate material. In this connection, it is the vaporizable liquid which acts as a vehicle to transport the waste material into the particulate material, that is, before being vaporized. The contents and disclosure of European Patent No. 655,955 are incorporated herein by reference.
One of the unanticipated problems associated with the process of European Patent No. 655,955 is that same is not suitable for treating by encapsulation waste materials consisting of an agglomeration of large
diameter, for example, heavy metals, which generally have an average diameter of 75mm. In particular, up until now, it was not appreciated that fly ash, having a particle size of between 10-40 micron, would not efficiently encapsulate waste material including agglomerated particles of large diameter, for example, heavy metals by the sole action of the vaporizable liquid.
According to the present invention there is provided a process for encapsulating waste material including the steps of: providing the waste material in association with a vaporisable liquid, admixing the waste material/liquid composition with a particulate material, preferably fly ash, and heating the admixture to remove the vaporizable liquid characterised in that the process further includes the step of pre-treating the waste material ultrasonically.
It is believed that a process in accordance with the present invention at least addresses the problems outlined above in that the step of pre-treating the waste material ultrasonically produces a slurry of smaller particle size, preferably below 5 microns, thereby making same suitable for use in encapsulating heavy metal waste materials.
In a further aspect of the present invention there is provided a process apparatus suitable for pre-treating a waste material prior to encapsulating same.
An apparatus suitable for carrying out the pre-treatment stage of the process of the present invention will now be described by way of reference to the accompanying drawing, in which:
Figure 1 is a schematic diagram of a process plant suitable for carrying out the process of the present invention.
As illustrated in Figure 1 , a sludge of variable particle size or dried material waste is delivered into vessel 1 via valve V2. The sludge is then mixed with a suitable solvent, such as toluene, by opening valve V1 , preferably at a dilution rate of between 1 to 10.
Once the solvent level is above the agitator or fluidising unit 2, the agitator 2 is started and the solvent is allowed to mix with the waste material.
After a predetermined time, that is, when the solids are thoroughly wetted, valve V3 is opened and the pump 3 is started. The pump 3 may be a simple slurry pump, jet pump, inductor or other hydro-transport device, which may need a transport medium, such as a further solvent, fed into it at pressure via valve V8. It is to be understood that in the case of large material, a maceration pump may be used.
Valves V4 and V6 are then opened and once re-circulation is established, an ultrasonic processor 4, preferably of the type disclosed in PCT GB96/01612, is actuated and the waste material is re-circulated until the slurry is suitably deaglomerated for encapsulation. This can be assessed by taking samples via sample plant valve V7.
Once this is achieved, V4 is closed and V5 is opened with V3, V6, V1 and V5 open. The system can be purged of any solids prior to a plant or system shut-down and the treated waste material is transferred for encapsulation as described in European Patent No. 0,655,955.
As illustrated, in an alternative embodiment, pump 3, may be replaced by a fluidising unit 5 which can act as a slurry transport system to either recirculate the waste material through the ultrasonic processor unit 4 and/or purge the system with solvent with all valves to vessel 1 closed and the valves to the fluidising unit 5 open.
It is to be understood that the process of the present invention, although not limited too, has particular application in the treatment of the following waste streams: waste paint, ink dyes, sludge and dry solids; tar sludge and solids waste; hydrocarbon sludges and solid waste; textile waste sludges; metal waste sludges; solvent degreasing sludges; dry cleaning sludges; radioactive sludges; petrochemical sludges; waste incinerator ash; waste incinerator fume scrubber materials; removal of hydrocarbon on fire ash to cement industries; waste based toxic sludges.
Claims
1. A process for encapsulating waste material including the step of: providing the waste material in association with a vaporisable liquid, admixing the waste material/liquid composition with a particulate material, and heating the admixture to remove the vaporisable liquid, characterised in that the process further includes the step of pre-treating the waste material ultrasonically.
2. A process as claimed in claim 1 , characterised in that the particulate material is fly ash.
3. A process as claimed in claim 1 or 2, characterised in that the step of pre-treating the waste material ultrasonically produces a slurry of particle size below 5 microns.
4. Apparatus suitable for pre-treating a waste material in the process of any one of the preceding claims.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0117107.3 | 2001-07-13 | ||
| GBGB0117107.3A GB0117107D0 (en) | 2001-07-13 | 2001-07-13 | Process for encapsulating a waste material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2003006186A1 true WO2003006186A1 (en) | 2003-01-23 |
Family
ID=9918434
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/GB2002/003207 Ceased WO2003006186A1 (en) | 2001-07-13 | 2002-07-12 | Process for encapsulating a waste material |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB0117107D0 (en) |
| WO (1) | WO2003006186A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2477924A (en) * | 2010-02-17 | 2011-08-24 | Encapsuwaste Ltd | A method of encapsulating waste material |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993009859A1 (en) * | 1991-11-11 | 1993-05-27 | Henkel Kommanditgesellschaft Auf Aktien | Removal of hydrocarbons, cooling lubricants and/or oils from the surface of fine particles |
| WO1994004290A1 (en) * | 1992-08-19 | 1994-03-03 | British Technology Group Inter-Corporate Licensing Limited | Process for encapsulating a waste material |
| WO1997002088A1 (en) * | 1995-07-05 | 1997-01-23 | Advanced Assured Homes 17 Plc | Improvements in or relating to ultrasonic processors |
-
2001
- 2001-07-13 GB GBGB0117107.3A patent/GB0117107D0/en not_active Ceased
-
2002
- 2002-07-12 WO PCT/GB2002/003207 patent/WO2003006186A1/en not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993009859A1 (en) * | 1991-11-11 | 1993-05-27 | Henkel Kommanditgesellschaft Auf Aktien | Removal of hydrocarbons, cooling lubricants and/or oils from the surface of fine particles |
| WO1994004290A1 (en) * | 1992-08-19 | 1994-03-03 | British Technology Group Inter-Corporate Licensing Limited | Process for encapsulating a waste material |
| EP0655955A1 (en) * | 1992-08-19 | 1995-06-07 | British Technology Group Inter-Corporate Licensing Limited | Process for encapsulating a waste material |
| WO1997002088A1 (en) * | 1995-07-05 | 1997-01-23 | Advanced Assured Homes 17 Plc | Improvements in or relating to ultrasonic processors |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2477924A (en) * | 2010-02-17 | 2011-08-24 | Encapsuwaste Ltd | A method of encapsulating waste material |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0117107D0 (en) | 2001-09-05 |
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