CA2106983A1 - Process for purifying exhaust air - Google Patents
Process for purifying exhaust airInfo
- Publication number
- CA2106983A1 CA2106983A1 CA 2106983 CA2106983A CA2106983A1 CA 2106983 A1 CA2106983 A1 CA 2106983A1 CA 2106983 CA2106983 CA 2106983 CA 2106983 A CA2106983 A CA 2106983A CA 2106983 A1 CA2106983 A1 CA 2106983A1
- Authority
- CA
- Canada
- Prior art keywords
- activated sludge
- solvent
- washing liquid
- contaminants
- exhaust air
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/145—Ultrafiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1493—Selection of liquid materials for use as absorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D53/229—Integrated processes (Diffusion and at least one other process, e.g. adsorption, absorption)
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/84—Biological processes
-
- 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
- C02F1/26—Treatment of water, waste water, or sewage by extraction
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/025—Biological purification using sources of oxygen other than air, oxygen or ozone
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1205—Particular type of activated sludge processes
- C02F3/1231—Treatments of toxic sewage
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- 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
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Biodiversity & Conservation Biology (AREA)
- Hydrology & Water Resources (AREA)
- Analytical Chemistry (AREA)
- Organic Chemistry (AREA)
- Molecular Biology (AREA)
- Microbiology (AREA)
- Biomedical Technology (AREA)
- Toxicology (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Treating Waste Gases (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Cleaning Or Drying Semiconductors (AREA)
- Glass Compositions (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Activated Sludge Processes (AREA)
- Treatment Of Sludge (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The invention concerns a process for cleaning exhaust air containing biodegrad-able contaminants which arc only slightly soluble in water. The contaminants are ab-sorbed by a washing liquid containing activated sludge and at least one high boiling solvent for the contaminants and are decomposed by the activated sludge. The solvent and the activated sludge are separated from at least part of the remaining washing li-quid which is then drained off. In order to reduce significantly the amount of sub-stances which are dangerous to the environment or to health in the washing liquid sep-arated off, it is proposed that part of the remaining washing liquid be separated off by membrane filtration using inorganic or hydrophilicized organic membranes. Silicone oil is a particularly suitable solvent for use in the process.
The invention concerns a process for cleaning exhaust air containing biodegrad-able contaminants which arc only slightly soluble in water. The contaminants are ab-sorbed by a washing liquid containing activated sludge and at least one high boiling solvent for the contaminants and are decomposed by the activated sludge. The solvent and the activated sludge are separated from at least part of the remaining washing li-quid which is then drained off. In order to reduce significantly the amount of sub-stances which are dangerous to the environment or to health in the washing liquid sep-arated off, it is proposed that part of the remaining washing liquid be separated off by membrane filtration using inorganic or hydrophilicized organic membranes. Silicone oil is a particularly suitable solvent for use in the process.
Description
PROCESS FOR PURIFYING EXHAUST AIR
This invendon relates to a process for purifying exhaust air contaminated with substantially water-insoluble, biologically degradable pollutants which are absorbed by a washing liquid containing activated sludge and at least one high-boiling solvent for ~he pollutants and which are degraded by the activated sludge, the solvent and the activated sludge being separated from at least part of the remaining washing liquid which is discharged One such process is known from DE 36 41 442 Al The exhaust air contamin-a~ed with the pollutants is passed through an absorp~ion tower in which the pollutants are absorbed by the washing liquid containing activated sludge and solvent The washing liquid then flous in~o an activated sludge tank where the pollutants are bio-logically degraded by the microorganisms of the activated sludge In order to prevent 21~6983 the conccnlralion of salts and Ihe possiblc accumulation of biological growth inhibilors in lhe washing liquid, part of thc washing liquid is continuously removed from the washing liquid circuit by a pump and delivercd to a flotation lank. In this tank, the high-boiling solvent is removed with the activated sludge from the remaining washing s liquid by flotation and mtllrned to the acliva~ed sludge tank. The clear water is dis-charged into the main drainage system. Dialkyl phthalates, particularly dioctyl phthal-ate and dinonyl phthalate, are used as solvents in the known process.
The disadvantage of the known process is that the clear water separated by flO-tation has a relatively high contcnt of solvent and, optionally, activa~ed sludge, so that .o an additional working-up step has to be subsequently carried out or the washing liquid separated off has to be disposed of as waste water at considerable expense.
l he problem addressed by the present invention was further to develop the pro-cess mentioned at the beginning to the extent that the contenl of ecologically and physiologically harmful substances in the washing liquid to be separated off is consid-.s erably reduced without any expensive additional measures having to be taken.
According to the invention, the solution to this problem is characterized in thatthe part of the remaining washing liquid is separated off by membrane filtration using inorganic and hydrophilicized organic membranes.
On the one hand, the use of silicone oil provides for excellent absorption of 20 the pollutants of the exhaust air in the washing liquid. On the other hand, silicone oil is physiologically inert and, hence, largely safe and, according to the invention, may be separated very effectively together with the activated sludge from the remaining washing liquid by membrane filtration. Using the process according to the invention, the residual silicone oil content in the washing liquid separated off can be reduced to 2s one twentieth or less by comparison with the known process. It has surprisingly been found that, even in the event of prolonged operation, separation of the three-compon-enl mixlure of silicone oil. activated sludge and washing liguid can readily be carried out withou~ blockage of the membrane, provided thal inorganic or hydrophilicized or-ganic membranes are used. Solvent contents far below the corresponding legal limits 30 are achieved by the further developmen~ of the process men~ioned at the beginning in accordance with the present invenlion.
In one embodiment, the process according to the invention is carried oul con-21~6983 tinuously by recycling thc rclcntatc con~aining solvcnl and activa~ed sludge and replac-ing the quanti~y of pcrmca~e rcmoved by fresh washing liquid (water). A procedure such as this is adapted lo the continuous operation of a waste-air purifying plant. By virtue of the low contents of ccologically safe substances, the permeate removed may s readily be dischargcd into the main drainage system.
In some cases, i~ may be necessary to remove the activated sludge circulated in the process according to the invcntion from the circuit, for example in order to re-place it. One particular advantage of the process according to the invention lies in the possibility of thickening the mixture of activaled sludge, solvent and residual washing o liquid to such an extent that an almost punctureproof mass is obtained. Accordingly, it is proposed that the process be carried out discontinuously for concentrating and, in particular, thickening the solvent-containing activated sludge. In this case, too, the contents of ecologically unsafe substances in the permeate remain small. It has been found to be particularly suitable to use a surface-hydrophilicized fluoropolymer as a s membrane material in the process according to the invention. There is thus no danger of the membrane nnaterial losing any of its hydrophilic properties under certain influ-ences which would impair the efficiency of the process.
Microfiltration, ultrafiltration or nanofiltration membranes may be used as the membranes. Crossflow membrane filtration is applied with particular advantage in the process according to the invention.
The process according to the invention may readily be carried out continuously.
In order, however, to provide a particular safety margin for certain cases, it is propos-ed that the membrane be periodically washed with a cleaning liquid. This can be done by fixedly installing a container accommodating the cleaning liquid in the plant and periodically interrupting the flow of washing liquid through or over the membrane and, instead, passing the cleaning liquid through the membrane.
Examples Embodiments of the invention are described in detail in the following with ref-erence to the accompanying drawing which is a schematic flow chart of the process.
Referring to the drawing (Fig. 1), the exhaust air contaminated with the sub-stantially water-insoluble, biologically degradable pollulants en~ers an absorption col-umn I at its lower end, is drawn through the column I by a fan 2 arranged at the head 21 ~6983 of thc column and discharged as purified exhaus~ air at lhc hcad of the column. A
washing liquid containing activaled sludge and solvent, i.e. silicone oil, is pumped ~hrough the column in countercurrent to the upwardly llowing exhaust air, i.e. from the head to the boltom of the column, by means of a first circulation pump 4. The s washing liquid then flOws back to the activatcd sludge tank 3. In order to avoid the above-mentioned concentration of salts and accumulation of biological growth inhibit-ors, part of the liquid in the activated sludge tank is removed by a second circulation pump 5 and re~urned to ~he activated sludge tank 3 through a membrane module 6.
Permeate collecting in the membrane module 6 is discharged as wastewater. To re-,o place the wastewater removed, a corresponding quantity of fresh water is delivered to the activated sludge tank 3.
In tests, it was shown that the concentration of the high-boiling solvent, sili-cone oil, could be reduced to levels of 50 mg/l to 60 mg/l by the use of suitable mem-branes. By contrast, the wastewater from the flotation tank contains more than 1000 ~s mg/l to 1500 mg/l of the high-boiling solvent.
Further Example:
An activated sludge dispersion containing 20 % silicone oil and a biomass con-tent of 20 g/l was used as starting material for the membrane stage. A DDSS Hekla 20 A ultrafiltration membrane was used. The pressure on the concentrate side was at most 3 bar, the membrane crossflow rate was 3 m/s. The temperature was between 19 and 29 C.
In this case, the membrane stage was operated in batches, i.e. the concentrate was returned to the supply tank. In this way, there was a continuous increase in the viscosity and a corresponding reduction in the water content of the starting material.
x Accordingly, the permeate flows decreased from, initially, 70 Vm2 h to levels of 20 Vm2~. The concentrate was concentraled virtually to the individual star~ing componcnts - silicone oil and biomass. Mixed samples of the permeate obtained had a content of 4 mgA to 6 mgA of silicone oil, determined as substances soluble in pe-troleum ether.
210~983 List of reference numerals I Absorption column 2 Fan 3 Activated sludge tank 4 First circulation pump 5 Second circulation pump 6 Membranc module
This invendon relates to a process for purifying exhaust air contaminated with substantially water-insoluble, biologically degradable pollutants which are absorbed by a washing liquid containing activated sludge and at least one high-boiling solvent for ~he pollutants and which are degraded by the activated sludge, the solvent and the activated sludge being separated from at least part of the remaining washing liquid which is discharged One such process is known from DE 36 41 442 Al The exhaust air contamin-a~ed with the pollutants is passed through an absorp~ion tower in which the pollutants are absorbed by the washing liquid containing activated sludge and solvent The washing liquid then flous in~o an activated sludge tank where the pollutants are bio-logically degraded by the microorganisms of the activated sludge In order to prevent 21~6983 the conccnlralion of salts and Ihe possiblc accumulation of biological growth inhibilors in lhe washing liquid, part of thc washing liquid is continuously removed from the washing liquid circuit by a pump and delivercd to a flotation lank. In this tank, the high-boiling solvent is removed with the activated sludge from the remaining washing s liquid by flotation and mtllrned to the acliva~ed sludge tank. The clear water is dis-charged into the main drainage system. Dialkyl phthalates, particularly dioctyl phthal-ate and dinonyl phthalate, are used as solvents in the known process.
The disadvantage of the known process is that the clear water separated by flO-tation has a relatively high contcnt of solvent and, optionally, activa~ed sludge, so that .o an additional working-up step has to be subsequently carried out or the washing liquid separated off has to be disposed of as waste water at considerable expense.
l he problem addressed by the present invention was further to develop the pro-cess mentioned at the beginning to the extent that the contenl of ecologically and physiologically harmful substances in the washing liquid to be separated off is consid-.s erably reduced without any expensive additional measures having to be taken.
According to the invention, the solution to this problem is characterized in thatthe part of the remaining washing liquid is separated off by membrane filtration using inorganic and hydrophilicized organic membranes.
On the one hand, the use of silicone oil provides for excellent absorption of 20 the pollutants of the exhaust air in the washing liquid. On the other hand, silicone oil is physiologically inert and, hence, largely safe and, according to the invention, may be separated very effectively together with the activated sludge from the remaining washing liquid by membrane filtration. Using the process according to the invention, the residual silicone oil content in the washing liquid separated off can be reduced to 2s one twentieth or less by comparison with the known process. It has surprisingly been found that, even in the event of prolonged operation, separation of the three-compon-enl mixlure of silicone oil. activated sludge and washing liguid can readily be carried out withou~ blockage of the membrane, provided thal inorganic or hydrophilicized or-ganic membranes are used. Solvent contents far below the corresponding legal limits 30 are achieved by the further developmen~ of the process men~ioned at the beginning in accordance with the present invenlion.
In one embodiment, the process according to the invention is carried oul con-21~6983 tinuously by recycling thc rclcntatc con~aining solvcnl and activa~ed sludge and replac-ing the quanti~y of pcrmca~e rcmoved by fresh washing liquid (water). A procedure such as this is adapted lo the continuous operation of a waste-air purifying plant. By virtue of the low contents of ccologically safe substances, the permeate removed may s readily be dischargcd into the main drainage system.
In some cases, i~ may be necessary to remove the activated sludge circulated in the process according to the invcntion from the circuit, for example in order to re-place it. One particular advantage of the process according to the invention lies in the possibility of thickening the mixture of activaled sludge, solvent and residual washing o liquid to such an extent that an almost punctureproof mass is obtained. Accordingly, it is proposed that the process be carried out discontinuously for concentrating and, in particular, thickening the solvent-containing activated sludge. In this case, too, the contents of ecologically unsafe substances in the permeate remain small. It has been found to be particularly suitable to use a surface-hydrophilicized fluoropolymer as a s membrane material in the process according to the invention. There is thus no danger of the membrane nnaterial losing any of its hydrophilic properties under certain influ-ences which would impair the efficiency of the process.
Microfiltration, ultrafiltration or nanofiltration membranes may be used as the membranes. Crossflow membrane filtration is applied with particular advantage in the process according to the invention.
The process according to the invention may readily be carried out continuously.
In order, however, to provide a particular safety margin for certain cases, it is propos-ed that the membrane be periodically washed with a cleaning liquid. This can be done by fixedly installing a container accommodating the cleaning liquid in the plant and periodically interrupting the flow of washing liquid through or over the membrane and, instead, passing the cleaning liquid through the membrane.
Examples Embodiments of the invention are described in detail in the following with ref-erence to the accompanying drawing which is a schematic flow chart of the process.
Referring to the drawing (Fig. 1), the exhaust air contaminated with the sub-stantially water-insoluble, biologically degradable pollulants en~ers an absorption col-umn I at its lower end, is drawn through the column I by a fan 2 arranged at the head 21 ~6983 of thc column and discharged as purified exhaus~ air at lhc hcad of the column. A
washing liquid containing activaled sludge and solvent, i.e. silicone oil, is pumped ~hrough the column in countercurrent to the upwardly llowing exhaust air, i.e. from the head to the boltom of the column, by means of a first circulation pump 4. The s washing liquid then flOws back to the activatcd sludge tank 3. In order to avoid the above-mentioned concentration of salts and accumulation of biological growth inhibit-ors, part of the liquid in the activated sludge tank is removed by a second circulation pump 5 and re~urned to ~he activated sludge tank 3 through a membrane module 6.
Permeate collecting in the membrane module 6 is discharged as wastewater. To re-,o place the wastewater removed, a corresponding quantity of fresh water is delivered to the activated sludge tank 3.
In tests, it was shown that the concentration of the high-boiling solvent, sili-cone oil, could be reduced to levels of 50 mg/l to 60 mg/l by the use of suitable mem-branes. By contrast, the wastewater from the flotation tank contains more than 1000 ~s mg/l to 1500 mg/l of the high-boiling solvent.
Further Example:
An activated sludge dispersion containing 20 % silicone oil and a biomass con-tent of 20 g/l was used as starting material for the membrane stage. A DDSS Hekla 20 A ultrafiltration membrane was used. The pressure on the concentrate side was at most 3 bar, the membrane crossflow rate was 3 m/s. The temperature was between 19 and 29 C.
In this case, the membrane stage was operated in batches, i.e. the concentrate was returned to the supply tank. In this way, there was a continuous increase in the viscosity and a corresponding reduction in the water content of the starting material.
x Accordingly, the permeate flows decreased from, initially, 70 Vm2 h to levels of 20 Vm2~. The concentrate was concentraled virtually to the individual star~ing componcnts - silicone oil and biomass. Mixed samples of the permeate obtained had a content of 4 mgA to 6 mgA of silicone oil, determined as substances soluble in pe-troleum ether.
210~983 List of reference numerals I Absorption column 2 Fan 3 Activated sludge tank 4 First circulation pump 5 Second circulation pump 6 Membranc module
Claims (7)
1. A process for purifying exhaust air contaminated with substantially water-inso-uble, biologically degradable pollutants which are adsorbed by a washing liquid con-taining activated sludge and at least one high-boiling solvent for the contaminants and which are degraded by the activated sludge, the solvent and the activated sludge being separated from at least a part of the remaining washing liquid which is discharged, characterized in that the separation of a part of the remaining wash liquid is accomp-lished by membrane filtration using inorganic or hydrophilicized organic membranes.
2. A process as claimed in claim 1, characterized in that silicone oil is used as the solvent.
3. A process as claimed in claim 1 or 2, characterized in that the process is carried out continuously by returning the retentate containing solvent and activated sludge and replacing the permeate removed by fresh washing liquid.
4. A process as claimed in claim 1 or 3, characterized in that the process is car-ried out discontinuously for concentrating and, in particular, thickening the solvent-containing activated sludge.
5. A process as claimed in any of claims 1 to 4, characterized in that surface-hy-drophilicized fluoropolymer is used as the membrane material.
6. A process as claimed in any of claims 1 to 5, characterized in that crossflowfiltration is carried out.
7. A process as claimed in any of claims 1 to 6. characterized in that the mem-brane is periodically washed with a cleaning liquid.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4109732A DE4109732A1 (en) | 1991-03-25 | 1991-03-25 | EXHAUST AIR PROCESS |
| DEP4109732.7 | 1991-03-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2106983A1 true CA2106983A1 (en) | 1992-09-26 |
Family
ID=6428138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2106983 Abandoned CA2106983A1 (en) | 1991-03-25 | 1992-03-16 | Process for purifying exhaust air |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0579623B1 (en) |
| AT (1) | ATE119799T1 (en) |
| CA (1) | CA2106983A1 (en) |
| DE (2) | DE4109732A1 (en) |
| DK (1) | DK0579623T3 (en) |
| ES (1) | ES2069419T3 (en) |
| GR (1) | GR3015755T3 (en) |
| WO (1) | WO1992016283A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9463410B2 (en) | 2010-09-23 | 2016-10-11 | General Electric Technology Gmbh | Trace component removal in CO2 removal processes by means of a semipermeable membrane |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2116089C (en) * | 1994-02-21 | 2004-05-04 | Fuelmaker Corporation | Method and apparatus for dewatering gas stream resulting in a clean water effluent |
| AT401891B (en) * | 1995-02-17 | 1996-12-27 | Krems Chemie Ag | FILLING MATERIALS FOR BIOLOGICAL EXHAUST AIR PURIFICATION |
| BE1009472A3 (en) * | 1995-07-03 | 1997-04-01 | Applic Of Cleaning Tech On Soi | Method for thermo-biological cleansing of soil contaminated by organic compounds and device for the application of this method |
| AT405250B (en) * | 1996-12-17 | 1999-06-25 | Gottfried Dipl Ing Klaushofer | Waste air purification |
| EP0955352A1 (en) * | 1998-05-03 | 1999-11-10 | Haase Energietechnik GmbH | Reduction of silicon compounds in fuel gases |
| US7247210B2 (en) | 2004-02-23 | 2007-07-24 | Ecolab Inc. | Methods for treating CIP equipment and equipment for treating CIP equipment |
| US7392811B2 (en) | 2004-02-23 | 2008-07-01 | Ecolab Inc. | Delivery head for multiple phase treatment composition, vessel including a delivery head, and method for treating a vessel interior surface |
| US7220358B2 (en) | 2004-02-23 | 2007-05-22 | Ecolab Inc. | Methods for treating membranes and separation facilities and membrane treatment composition |
| US20130064745A1 (en) * | 2010-06-03 | 2013-03-14 | I.D.E. Technologies Ltd. | Flue gas treatment and permeate hardening |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3542599A1 (en) * | 1985-12-03 | 1987-06-04 | Ulrich Dipl Ing Baeuerle | Process and apparatus for eliminating sparingly water-soluble and readily volatile impurities from an exhaust air stream or exhaust gas stream by biological oxidation |
| US4976751A (en) * | 1986-12-04 | 1990-12-11 | Keramchemie Gmbh | Method for purification of exhaust air |
| DE3709174A1 (en) * | 1987-03-20 | 1988-09-29 | Wehrle Werk Ag | Process and apparatus for the biological purification of organically polluted waste waters |
| SE9000379L (en) * | 1989-06-05 | 1990-12-06 | Ivl Inst Vatten Luftvardsforsk | PROCEDURES FOR BIOLOGICAL CLEANING OF WASTE WATER CONDUCTING POLLUTANTS WITH HARDWARDABLE ORGANIC SUBSTANCES |
-
1991
- 1991-03-25 DE DE4109732A patent/DE4109732A1/en not_active Withdrawn
-
1992
- 1992-03-16 EP EP19920906671 patent/EP0579623B1/en not_active Revoked
- 1992-03-16 ES ES92906671T patent/ES2069419T3/en not_active Expired - Lifetime
- 1992-03-16 DE DE59201674T patent/DE59201674D1/en not_active Revoked
- 1992-03-16 AT AT92906671T patent/ATE119799T1/en not_active IP Right Cessation
- 1992-03-16 WO PCT/EP1992/000566 patent/WO1992016283A1/en not_active Application Discontinuation
- 1992-03-16 DK DK92906671T patent/DK0579623T3/en active
- 1992-03-16 CA CA 2106983 patent/CA2106983A1/en not_active Abandoned
-
1995
- 1995-04-12 GR GR950400903T patent/GR3015755T3/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9463410B2 (en) | 2010-09-23 | 2016-10-11 | General Electric Technology Gmbh | Trace component removal in CO2 removal processes by means of a semipermeable membrane |
Also Published As
| Publication number | Publication date |
|---|---|
| GR3015755T3 (en) | 1995-07-31 |
| ATE119799T1 (en) | 1995-04-15 |
| DE4109732A1 (en) | 1992-10-01 |
| EP0579623A1 (en) | 1994-01-26 |
| WO1992016283A1 (en) | 1992-10-01 |
| DK0579623T3 (en) | 1995-08-07 |
| ES2069419T3 (en) | 1995-05-01 |
| EP0579623B1 (en) | 1995-03-15 |
| DE59201674D1 (en) | 1995-04-20 |
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