CA2088142A1 - Cleaning waste water contaminated with oil and grease - Google Patents
Cleaning waste water contaminated with oil and greaseInfo
- Publication number
- CA2088142A1 CA2088142A1 CA 2088142 CA2088142A CA2088142A1 CA 2088142 A1 CA2088142 A1 CA 2088142A1 CA 2088142 CA2088142 CA 2088142 CA 2088142 A CA2088142 A CA 2088142A CA 2088142 A1 CA2088142 A1 CA 2088142A1
- Authority
- CA
- Canada
- Prior art keywords
- waste water
- talc
- grease
- oil
- cleaning waste
- 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.)
- Abandoned
Links
- 239000002351 wastewater Substances 0.000 title claims abstract description 28
- 239000004519 grease Substances 0.000 title description 5
- 238000004140 cleaning Methods 0.000 title 1
- 239000000454 talc Substances 0.000 claims abstract description 18
- 229910052623 talc Inorganic materials 0.000 claims abstract description 18
- 239000003921 oil Substances 0.000 claims abstract description 9
- 238000001179 sorption measurement Methods 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- 239000010985 leather Substances 0.000 claims abstract description 4
- 235000013372 meat Nutrition 0.000 claims abstract description 3
- 238000012856 packing Methods 0.000 claims abstract description 3
- 239000004922 lacquer Substances 0.000 claims description 2
- 239000010419 fine particle Substances 0.000 abstract description 5
- 235000012222 talc Nutrition 0.000 description 16
- 239000000126 substance Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 150000002430 hydrocarbons Chemical class 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 229930195733 hydrocarbon Natural products 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000010802 sludge Substances 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical class O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 239000008394 flocculating agent Substances 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- 238000005188 flotation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 229960000250 adipic acid Drugs 0.000 description 1
- 230000000274 adsorptive effect Effects 0.000 description 1
- 239000008346 aqueous phase Substances 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 230000031018 biological processes and functions Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- -1 chalk Chemical compound 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000368 destabilizing effect Effects 0.000 description 1
- BUACSMWVFUNQET-UHFFFAOYSA-H dialuminum;trisulfate;hydrate Chemical compound O.[Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O BUACSMWVFUNQET-UHFFFAOYSA-H 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 235000012243 magnesium silicates Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- 239000012074 organic phase Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
- B01D17/0202—Separation of non-miscible liquids by ab- or adsorption
-
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
Landscapes
- Chemical & Material Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Thermal Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Sorption (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
ABSTRACT
Fine-particle talc with a grain size of so to 3 µm is particularly well suited as an adsorption agent for purifying waste water that is contaminated with oils and greases, in particular such waste water from leather factories, meat packing plants, refineries, large lacquering plants, and the like.
Fine-particle talc with a grain size of so to 3 µm is particularly well suited as an adsorption agent for purifying waste water that is contaminated with oils and greases, in particular such waste water from leather factories, meat packing plants, refineries, large lacquering plants, and the like.
Description
PVRIFICATION ~F WASTE WATER THAT CONT~INS
OIL AND GREASE
The present invention relates to the use of talc as an agent for purifying waste water that contains oil and grease.
In industrial processes, during the elimination of organic impurities, and in numerous washing processes, dispersions of organic màterials that are insoluble in water occur in an aqueous phase, in which the organic phase is present in the form of very fine particles or even in colloidal form. The separation of dispersions of this kind presents extraordinary difficulties.
In the processes that have been used up to now to effect such separation, in most cases additional chemical products are used as separation aids, and these, in their turn, are either found in the purified waste water or in the sludge that is formed, ~nd have to be disposed of in their turn.
In the domain of waste water that contalns oil, and which are mixtures of water with the most varied kinds of hydrocarbon compounds, the hydrocarbons are present in various basic forms and the purification measures used up to now are hased on the occurrence of such substances. In the case of hydrocarbons that are present in the waste water in an undissolved state, separation can be e~fected in light-density material separators with the help of gravity. However, in most instances, hydrocarbons are contained in waste water in dissolved or emulsified form and for this reason can only be eliminated by using chemical-physical processes, when mainly flocculation, precipitation and flotation processes are used.
OIL AND GREASE
The present invention relates to the use of talc as an agent for purifying waste water that contains oil and grease.
In industrial processes, during the elimination of organic impurities, and in numerous washing processes, dispersions of organic màterials that are insoluble in water occur in an aqueous phase, in which the organic phase is present in the form of very fine particles or even in colloidal form. The separation of dispersions of this kind presents extraordinary difficulties.
In the processes that have been used up to now to effect such separation, in most cases additional chemical products are used as separation aids, and these, in their turn, are either found in the purified waste water or in the sludge that is formed, ~nd have to be disposed of in their turn.
In the domain of waste water that contalns oil, and which are mixtures of water with the most varied kinds of hydrocarbon compounds, the hydrocarbons are present in various basic forms and the purification measures used up to now are hased on the occurrence of such substances. In the case of hydrocarbons that are present in the waste water in an undissolved state, separation can be e~fected in light-density material separators with the help of gravity. However, in most instances, hydrocarbons are contained in waste water in dissolved or emulsified form and for this reason can only be eliminated by using chemical-physical processes, when mainly flocculation, precipitation and flotation processes are used.
2 Q ~ 2 As a generic term, flocculation is understood to include all of those processes in which emulsified or suspended materials are separated; in contrast to this, precipitation relates to the removal of dissolved substances. Flocculating agents are substances which, once dissolved in water, become voluminous precipitates that have a good destabilizing effect on suspensions or emulsions. However, when this is done it results in additional quantities of sludge that have to be subjected to secondary processing.
Flotation is understood to mean the ~loating of a substance in a liquid, this being brought about by the introduction of the smallest possible bubbles of gas. Once the substance has concentrated on the surface of the liquid, it can be removed from the system by using surface clearers.
A further possibility for purifying waste water that contains oil is seen in the use of specially adapted natural micro-organisms.
Because of the biological conversion of the substance that takes place, this is genuine disposal, in which the harmful substances are in fact broken down and not simply moved to another space.
The speed at which this breakdown takes place is, however, largely dependent on temperature and on the supply of nutrients, and it may require several years to take place.
Very frequently, adsorption methods are used to puri~y waste water, when the hydrocarbons are bound to activated charcoal or to adsorber resins. Adsorption on micaceous materials (DE~OS 1 167 278) or on an organophilic clay (DE-OS 37 19 929) has already been investigated~
US-PS 4 332 693 proposes a chemical agent for processing oily emulsions in industrial waste waters, this consisting of a multi-component mixture with a predominant proportion of acid activated bentonite, untreated bentonite, chalk, and aluminum sulphate, as 2~t~$~2 well as small ~uantities of adipinic acid, talcl and flocculating agent.
EP-A-O 117 586 describes a process for coagulating and separating the residues of high solid lacquers from alkaline aqueous circulating liquids from paint-mist wet separator systems. A
dispersion of talc, calcium oxide, calcium hydroxide, calcium carbonate, and/or z~nc stearate is used as the circulating liquid is used in order to increase the coagulation and separation effect.
In most instances, the subsequent disposal of the contaminated materials is effected in most instances by incineration or by regeneration of the adsorption agent using a stripper.
Surprisingly, it has now been found that talc with a specific grain size is an outstanding agent for separating oils and greases from waste water that contains them. The term "talc" is taken to mean a group of naturally occurring, widely found magnesium silicates. Talcs are distinguished, amongst other things, by low hardness (1 according to Mohs), a smooth texture, hydrophobic properties, and good adsorptive capabilities with respect to organic substances. Within the framework of using finely divided talc as provided for by the present invention, the use of talc with a grain size of 90 to 3 ~m has been found to be particularly advantageous. At this grain size, on the one hand there is an optimal adsorption capability for the oils and greases that are present in the water as impurities and, on the other hand, the talc that contains these substances can be flocculated out together with the other suspended substances and disposed of with the sludge that is formed.
The use of talc as an adsorption agent as provided for by the present invention can be used to good effect in all industrial operations that produce large quantities of waste water that is 2~8~
heavily contaminated with oils and greases. The contaminated waste water from leather factories, meat packing plants, refineries, major lacquering plants and the like are particularly well suited for waste water treatment according to the present invention. Practical tests have shown that the use of talc as an adsorption agent provides good results when used in connection with animal and mineral greases; both types of grease bind well to the talc.
The quantity of the fine particle talc that is used will depend primarily on the concentration of impurities in the waste water that have to be removed. Such quantities of talc can amount to approximately 100 mg per l-litre of waste water.
As an example of the use of fine particle talc as an adsorption agent, as in the present invention, its use in leather factories will be described. In these, waste water that contains grease is generated and this has a CSB value of up to 10,000. After this waste water has been treated with talc having a grain size of 30 ~m at a rate of 30 to 100 mg per 1-litre of water, the CSB value drops to below 5,000. A further reduction of the CSB value is not desired in every case, for otherwise the biological processes in the settling basins could be disrupted. The addition of fine-particle talc not only results in a reduction of the CSB value by some 50%; it also results in sludge that settles better, which is more easily removed, and from which the water can be removed very easily by pressing. Furthermore, as a consequence of the remarkable reduction of the CSB value, it is possible to achieve considerable economies in electrical energy for the fans used in aerobic waste water treatment.
Flotation is understood to mean the ~loating of a substance in a liquid, this being brought about by the introduction of the smallest possible bubbles of gas. Once the substance has concentrated on the surface of the liquid, it can be removed from the system by using surface clearers.
A further possibility for purifying waste water that contains oil is seen in the use of specially adapted natural micro-organisms.
Because of the biological conversion of the substance that takes place, this is genuine disposal, in which the harmful substances are in fact broken down and not simply moved to another space.
The speed at which this breakdown takes place is, however, largely dependent on temperature and on the supply of nutrients, and it may require several years to take place.
Very frequently, adsorption methods are used to puri~y waste water, when the hydrocarbons are bound to activated charcoal or to adsorber resins. Adsorption on micaceous materials (DE~OS 1 167 278) or on an organophilic clay (DE-OS 37 19 929) has already been investigated~
US-PS 4 332 693 proposes a chemical agent for processing oily emulsions in industrial waste waters, this consisting of a multi-component mixture with a predominant proportion of acid activated bentonite, untreated bentonite, chalk, and aluminum sulphate, as 2~t~$~2 well as small ~uantities of adipinic acid, talcl and flocculating agent.
EP-A-O 117 586 describes a process for coagulating and separating the residues of high solid lacquers from alkaline aqueous circulating liquids from paint-mist wet separator systems. A
dispersion of talc, calcium oxide, calcium hydroxide, calcium carbonate, and/or z~nc stearate is used as the circulating liquid is used in order to increase the coagulation and separation effect.
In most instances, the subsequent disposal of the contaminated materials is effected in most instances by incineration or by regeneration of the adsorption agent using a stripper.
Surprisingly, it has now been found that talc with a specific grain size is an outstanding agent for separating oils and greases from waste water that contains them. The term "talc" is taken to mean a group of naturally occurring, widely found magnesium silicates. Talcs are distinguished, amongst other things, by low hardness (1 according to Mohs), a smooth texture, hydrophobic properties, and good adsorptive capabilities with respect to organic substances. Within the framework of using finely divided talc as provided for by the present invention, the use of talc with a grain size of 90 to 3 ~m has been found to be particularly advantageous. At this grain size, on the one hand there is an optimal adsorption capability for the oils and greases that are present in the water as impurities and, on the other hand, the talc that contains these substances can be flocculated out together with the other suspended substances and disposed of with the sludge that is formed.
The use of talc as an adsorption agent as provided for by the present invention can be used to good effect in all industrial operations that produce large quantities of waste water that is 2~8~
heavily contaminated with oils and greases. The contaminated waste water from leather factories, meat packing plants, refineries, major lacquering plants and the like are particularly well suited for waste water treatment according to the present invention. Practical tests have shown that the use of talc as an adsorption agent provides good results when used in connection with animal and mineral greases; both types of grease bind well to the talc.
The quantity of the fine particle talc that is used will depend primarily on the concentration of impurities in the waste water that have to be removed. Such quantities of talc can amount to approximately 100 mg per l-litre of waste water.
As an example of the use of fine particle talc as an adsorption agent, as in the present invention, its use in leather factories will be described. In these, waste water that contains grease is generated and this has a CSB value of up to 10,000. After this waste water has been treated with talc having a grain size of 30 ~m at a rate of 30 to 100 mg per 1-litre of water, the CSB value drops to below 5,000. A further reduction of the CSB value is not desired in every case, for otherwise the biological processes in the settling basins could be disrupted. The addition of fine-particle talc not only results in a reduction of the CSB value by some 50%; it also results in sludge that settles better, which is more easily removed, and from which the water can be removed very easily by pressing. Furthermore, as a consequence of the remarkable reduction of the CSB value, it is possible to achieve considerable economies in electrical energy for the fans used in aerobic waste water treatment.
Claims (6)
1. The use of talc with a grain size of 90 µm to 3 µm as an adsorption agent to separate oils and greases from waste water that contains them.
2. Use as defined in claim 1, the waste water being waste water from leather factories.
3. Use as defined in claim 1, the waste water being waste water from meat packing plants.
4. Use as defined in claim 1, the waste water being waste water from refineries.
5. Use as defined in claim 1, the waste water being waste water from lacquer factories or lacquering plants.
6. Use as defined in one of the claims 1 to 5, characterized in that the talc is used at a rate of 30 to 100 mg per 1-litre of waste water.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT158190A AT394030B (en) | 1990-07-27 | 1990-07-27 | PURIFICATION OF OIL AND Grease-laden Waste Water |
| ATA1581/90 | 1990-07-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2088142A1 true CA2088142A1 (en) | 1992-01-28 |
Family
ID=3516510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2088142 Abandoned CA2088142A1 (en) | 1990-07-27 | 1991-07-24 | Cleaning waste water contaminated with oil and grease |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0541586A1 (en) |
| JP (1) | JPH06506390A (en) |
| AT (1) | AT394030B (en) |
| AU (1) | AU8099191A (en) |
| CA (1) | CA2088142A1 (en) |
| HU (1) | HUT67593A (en) |
| PL (1) | PL297649A1 (en) |
| SK (1) | SK3493A3 (en) |
| WO (1) | WO1992002459A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69400915T2 (en) * | 1993-03-11 | 1997-06-12 | Naintsch Mineralwerke | IMPROVED WASTE WATER TREATMENT METHOD USING LIVED SLUDGE TO ENLARGE CLEANING YIELDS |
| AT401383B (en) * | 1993-03-11 | 1996-08-26 | Naintsch Mineralwerke | Process for decreasing the sludge volume in biological wastewater purification and composition therefor |
| AT139U1 (en) * | 1994-06-01 | 1995-03-27 | Naintsch Mineralwerke | METHOD FOR BIOLOGICAL WASTEWATER TREATMENT, MEANS AND DEVICE THEREFOR |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2744451A1 (en) * | 1977-10-03 | 1979-04-12 | Dieter Knauer | Strip assembled door or window shutter - has strips of paired lamellae overlapping adjacent strips when closed |
| US4332693A (en) * | 1978-01-06 | 1982-06-01 | American Colloid Company | Agent for the purification of waste waters and process for its production |
| DE3043480A1 (en) * | 1980-11-18 | 1982-07-08 | Justin Hüppe GmbH, 2900 Oldenburg | SHUTTER |
| US4496374A (en) * | 1983-02-23 | 1985-01-29 | Parker Chemical Company | Compound and process for denaturing high solids paints |
-
1990
- 1990-07-27 AT AT158190A patent/AT394030B/en not_active IP Right Cessation
-
1991
- 1991-07-24 JP JP3512132A patent/JPH06506390A/en active Pending
- 1991-07-24 WO PCT/AT1991/000089 patent/WO1992002459A1/en not_active Application Discontinuation
- 1991-07-24 SK SK3493A patent/SK3493A3/en unknown
- 1991-07-24 CA CA 2088142 patent/CA2088142A1/en not_active Abandoned
- 1991-07-24 PL PL29764991A patent/PL297649A1/xx unknown
- 1991-07-24 HU HU20693A patent/HUT67593A/en unknown
- 1991-07-24 EP EP19910912911 patent/EP0541586A1/en not_active Withdrawn
- 1991-07-24 AU AU80991/91A patent/AU8099191A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| PL297649A1 (en) | 1992-07-13 |
| JPH06506390A (en) | 1994-07-21 |
| SK3493A3 (en) | 1993-10-06 |
| EP0541586A1 (en) | 1993-05-19 |
| HUT67593A (en) | 1995-04-28 |
| HU9300206D0 (en) | 1993-09-28 |
| AU8099191A (en) | 1992-03-02 |
| AT394030B (en) | 1992-01-27 |
| ATA158190A (en) | 1991-07-15 |
| WO1992002459A1 (en) | 1992-02-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |