EP0167558A1 - A method and apparatus for recovery of metals from liquid bath - Google Patents
A method and apparatus for recovery of metals from liquid bathInfo
- Publication number
- EP0167558A1 EP0167558A1 EP85900224A EP85900224A EP0167558A1 EP 0167558 A1 EP0167558 A1 EP 0167558A1 EP 85900224 A EP85900224 A EP 85900224A EP 85900224 A EP85900224 A EP 85900224A EP 0167558 A1 EP0167558 A1 EP 0167558A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- waste water
- compression chamber
- metals
- filters
- 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.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 16
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 9
- 239000002184 metal Substances 0.000 title claims abstract description 9
- 150000002739 metals Chemical class 0.000 title claims abstract description 8
- 238000011084 recovery Methods 0.000 title claims abstract description 5
- 239000007788 liquid Substances 0.000 title claims description 10
- 239000002351 wastewater Substances 0.000 claims abstract description 19
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 11
- 239000012141 concentrate Substances 0.000 claims abstract description 9
- 150000002500 ions Chemical class 0.000 claims abstract description 8
- 230000006835 compression Effects 0.000 claims description 12
- 238000007906 compression Methods 0.000 claims description 12
- 239000010865 sewage Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 229910021645 metal ion Inorganic materials 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 abstract description 3
- 238000001223 reverse osmosis Methods 0.000 abstract 1
- 229910052709 silver Inorganic materials 0.000 description 11
- 239000004332 silver Substances 0.000 description 11
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 10
- 238000000746 purification Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000000721 bacterilogical effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 150000003378 silver Chemical class 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
- G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
- G03C5/395—Regeneration of photographic processing agents other than developers; Replenishers therefor
- G03C5/3956—Microseparation techniques using membranes, e.g. reverse osmosis, ion exchange, resins, active charcoal
-
- 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
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/025—Reverse osmosis; Hyperfiltration
- B01D61/026—Reverse osmosis; Hyperfiltration comprising multiple reverse osmosis steps
-
- 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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/40—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture or use of photosensitive materials
Definitions
- the purpose of the subject invention is to provide a method of purification of the waste water from preferably photographic labora ⁇ tories and for recovery of silver therefrom as well as of other metals, the method being both efficient and inexpensive compared with prior-art methods.
- This purpose is achieved in accordance with the invention by collecting the waste water from all film processing stages in a collection container, when a predetermined amount of liquid has been collected in said container, transferring said liquid to a compression chamber and passing it through a number of a filters operating on the principle of reversed osmosis, channelling liquid from which the metal ions have been removed into a sewage while the concentrate present in the compression chamber is disharged at regular intervals into a collection tank to be transferred for further processing to recover metals present in the concentrate.
- the invention also concerns an apparatus for performing the method of purifying waste water containing heavy metals, said apparatus comprising a collection container from which a liquid pipe leads to a compression chamber which is fitted with filters operating on the principle of reversed osmosis, said compression chamber having an outlet through which is dicharged water from which heavymetal ions have been removed, and a line connecting said chamber with a collection tank for collection therein of the concentrate of heavy metal ions.
- Waste water is conducted from a laboratory 1 through a pipe 2 to a collection container 3 in which all waste water is collected, such as fixing solutions, developing solutions and rinsing baths.
- waste water is collected in the con ⁇ tainer 3, for instance 25 - 30 litres, it is supplied to a compression chamber 4 which in the embodiment illustrated herein is equipped with three filters 5, 6 and 7 operating on the principle of reversed os- mosis.
- the de- metallized water is supplied through a line 8 to a sewage pipe.
- the concentrate which remains inside the compression chamber 4 is supplied via a line 9 to a collection tank 10 in which the concentrate is collected.
- the tank 10 After a predetermined number of processing operations the tank 10 is sufficiently filled to be emptied or replaced by an empty tank and thereafter be transported to a plant in which its contents are further processed. In the case of laboratories of normal capacity the collection tank 10 probably will need to be removed for further processing of its contents at appr. monthly intervals.
- the invention is not limited to the embodiment described and shown herein but a number of modifications are possible within the the scope of the appended claims. For instance, it is quite possible to vary the number of filters used in dependence on the desired or required degree of purification and to a certain extent on the composition of the salts present in the waste water. It should be obvious that the waste water may be subjected to other purification processes for removal of other salts than those containing ions of heavy metals.
- the compression chamber may be provided with windows to allow monitoring of the condition of the filters.
Landscapes
- Water Supply & Treatment (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Nanotechnology (AREA)
- General Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Removal Of Specific Substances (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Procédé et appareil pour la purification d'eaux usées contenant des ions de métaux lourds. Grâce à l'utilisation de filtres (5, 6, 7) agissant selon le principe de l'osmose inverse, les eaux usées sont purifiées et le concentré résultant est une solution de sels pouvant être recueillie (10) en vue d'un traitement continu permettant la récupération des métaux.Method and apparatus for purifying wastewater containing heavy metal ions. Thanks to the use of filters (5, 6, 7) acting according to the principle of reverse osmosis, the waste water is purified and the resulting concentrate is a solution of salts which can be collected (10) for treatment. continuous allowing the recovery of metals.
Description
A Method and an Apparatus for Recovery of Metals from Liquid Bath
Large quantities of silver are used, in particular in the photographic processing industry. This silver is lost because after processing of the films the silver-containing processing solutions are discharged into the sewage water and into the environment. Not only does this constitute a considerable waste of an expensive and scarce material, since silver exists but in limited amounts in nature, but in addition thereto the waste also causes inexcusable environmental pollution. Heavy metals cause problems of various kinds. In this respect, one problem which hitherto has been given but little consideration deserves to be mentioned, namely the fact that even minute amounts of silver in the sewage water have a detrimental effect on bacterial life, with the result that bacteriological filters in sewage purification plants become ineffective very rapidly. Of the silver produced around the world the photography in¬ dustry uses appr. 28% and at the moment only 8$ thereof 1s recovered. Other metals are also used in the photography industry, such as gold, aluminium and iron. With the aid of the methods hitherto used, such as the electrolysis process, 60% of the silver may be recovered, but none of the other metal ions may be recovered by prior-art methods.
Many attempts therefore have been made to find methods of recovering silver from waste water. These attempts include methods for deposition of the metals or evaporation to extract the silver from the evaporation remainders e.g. by burning, and so on. However, these methods are very complex and expensive, particularly as they require ver large amounts of energy.
The purpose of the subject invention is to provide a method of purification of the waste water from preferably photographic labora¬ tories and for recovery of silver therefrom as well as of other metals, the method being both efficient and inexpensive compared with prior-art methods.
This purpose is achieved in accordance with the invention by collecting the waste water from all film processing stages in a collection container, when a predetermined amount of liquid has been collected in said container, transferring said liquid to a compression chamber and passing it through a number of a filters operating on the
principle of reversed osmosis, channelling liquid from which the metal ions have been removed into a sewage while the concentrate present in the compression chamber is disharged at regular intervals into a collection tank to be transferred for further processing to recover metals present in the concentrate.
,)The invention also concerns an apparatus for performing the method of purifying waste water containing heavy metals, said apparatus comprising a collection container from which a liquid pipe leads to a compression chamber which is fitted with filters operating on the principle of reversed osmosis, said compression chamber having an outlet through which is dicharged water from which heavymetal ions have been removed, and a line connecting said chamber with a collection tank for collection therein of the concentrate of heavy metal ions.
The invention will be described in closer detail in the fol- lowing with reference to the acompanying drawing which is a schematical representation of a plant designed to perform the method in accordance with the invention.
Waste water is conducted from a laboratory 1 through a pipe 2 to a collection container 3 in which all waste water is collected, such as fixing solutions, developing solutions and rinsing baths. When a predetermined amount of waste water has been collected in the con¬ tainer 3, for instance 25 - 30 litres, it is supplied to a compression chamber 4 which in the embodiment illustrated herein is equipped with three filters 5, 6 and 7 operating on the principle of reversed os- mosis. After having passed through the filters 5, 6 and 7 the de- metallized water is supplied through a line 8 to a sewage pipe. The concentrate which remains inside the compression chamber 4 is supplied via a line 9 to a collection tank 10 in which the concentrate is collected. After a predetermined number of processing operations the tank 10 is sufficiently filled to be emptied or replaced by an empty tank and thereafter be transported to a plant in which its contents are further processed. In the case of laboratories of normal capacity the collection tank 10 probably will need to be removed for further processing of its contents at appr. monthly intervals.
SUBSTITUTE SHEET
By using the reversed osmosis principle to clean the waste _ water in the manner suggested herein it has become possible to purify waste water which is polluted with heavy metal ions in an efficient and inexpensive manner. An additional advantage is that the waste water may be discharged directly into the natural recipient without further processing, possibly after having passed through municipal sewage purification plants. Silver which is an expensive rare metal and in addition exists only in scarce amounts may be recovered and re-used in a plant which may be constructed at reasonable costs and yet be so efficient that the waste water discharged therefrom contain such minute amounts of metal ions that their presence cannot be proved.
The invention is not limited to the embodiment described and shown herein but a number of modifications are possible within the the scope of the appended claims. For instance, it is quite possible to vary the number of filters used in dependence on the desired or required degree of purification and to a certain extent on the composition of the salts present in the waste water. It should be obvious that the waste water may be subjected to other purification processes for removal of other salts than those containing ions of heavy metals. The compression chamber may be provided with windows to allow monitoring of the condition of the filters.
Claims
1. A method of purifying waste water containing ions of heavy metals, preferably waste water from film-processing laboratories, c h a r a c t e r i z e d by collecting the waste water from all film-processing stages in a collection container, when a predetermined amount of liquid has been collected in said container transferring said liquid to a compression chamber and passing it through a number of filters operating on the principle of reversed osmosis, channelling liquid from which the metal ions have been removed into a sewage while the concentrate present in the compression chamber is discharged at regular intervals into a collection tank to be transferred for further processing for recovery of metals present in said concentrate.
2. An apparatus for performing the method as claimed in claim 1 for purifying waste water containing heavy metals, c a ¬ r a c t e r i z e d by a collection container (3) from which a liquid pipe leads to a compression chamber (4) which is fitted with filters (5, 6, 7) operating on the principle of reversed osmosis, said compression chamber (4) having an outlet (8) through which is discharged water from which heavy metal ions have been removed, and a line (9) connecting said chamber with a collection tank (10) in which said concentrate of heavy metal ions is collected.
3. An apparatus as claimed in claim 2, c h a r a c t e r i¬ z e d therein that the compression chamber (4) is provided with three filters (5, 67) operating on the principle of reversed osmosis.
SUBSTITUTE SHEET
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE8400034A SE8400034L (en) | 1984-01-04 | 1984-01-04 | METHODAL RECOVERY METHOD AND DEVICE IN BATH |
| SE8400034 | 1984-01-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0167558A1 true EP0167558A1 (en) | 1986-01-15 |
Family
ID=20354215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP85900224A Withdrawn EP0167558A1 (en) | 1984-01-04 | 1985-01-03 | A method and apparatus for recovery of metals from liquid bath |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0167558A1 (en) |
| FI (1) | FI853241L (en) |
| NO (1) | NO853287L (en) |
| SE (1) | SE8400034L (en) |
| WO (1) | WO1985003064A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4885095A (en) * | 1987-04-03 | 1989-12-05 | Water Technologies, Inc. | System for separating solutions |
| FR2773892B1 (en) * | 1998-01-22 | 2003-11-07 | Eastman Kodak Co | METHOD AND DEVICE FOR THE RECYCLING OF WASHING WATERS FROM PHOTOGRAPHIC TREATMENTS |
| FR2786280B1 (en) * | 1998-11-25 | 2005-03-18 | Eastman Kodak Co | METHOD AND DEVICE FOR RECYCLING WASHING WATER FROM PHOTOGRAPHIC PROCESSES |
| EP0932078B1 (en) * | 1998-01-22 | 2004-09-15 | Eastman Kodak Company | Process and device for recycling washing water in photographic processing |
-
1984
- 1984-01-04 SE SE8400034A patent/SE8400034L/en not_active Application Discontinuation
-
1985
- 1985-01-03 EP EP85900224A patent/EP0167558A1/en not_active Withdrawn
- 1985-01-03 WO PCT/SE1985/000003 patent/WO1985003064A1/en not_active Application Discontinuation
- 1985-08-20 NO NO853287A patent/NO853287L/en unknown
- 1985-08-22 FI FI853241A patent/FI853241L/en not_active Application Discontinuation
Non-Patent Citations (1)
| Title |
|---|
| See references of WO8503064A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FI853241A0 (en) | 1985-08-22 |
| NO853287L (en) | 1985-08-20 |
| WO1985003064A1 (en) | 1985-07-18 |
| SE8400034D0 (en) | 1984-01-04 |
| SE8400034L (en) | 1985-07-05 |
| FI853241L (en) | 1985-08-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Designated state(s): AT BE CH DE FR GB LI LU NL SE |
|
| 17P | Request for examination filed |
Effective date: 19860103 |
|
| 17Q | First examination report despatched |
Effective date: 19861205 |
|
| 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 |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19870716 |