EP0497199A1 - Procédé et appareil pour la récyclage d'eau de lavage, photographique - Google Patents

Procédé et appareil pour la récyclage d'eau de lavage, photographique Download PDF

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Publication number
EP0497199A1
EP0497199A1 EP92100984A EP92100984A EP0497199A1 EP 0497199 A1 EP0497199 A1 EP 0497199A1 EP 92100984 A EP92100984 A EP 92100984A EP 92100984 A EP92100984 A EP 92100984A EP 0497199 A1 EP0497199 A1 EP 0497199A1
Authority
EP
European Patent Office
Prior art keywords
wash water
solution
hereinbefore
mgs
sensitive material
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Withdrawn
Application number
EP92100984A
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German (de)
English (en)
Inventor
Ferdinando Foschini
Vincenzo Longo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LED ITALIA Srl
Original Assignee
LED ITALIA Srl
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by LED ITALIA Srl filed Critical LED ITALIA Srl
Publication of EP0497199A1 publication Critical patent/EP0497199A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • G03C5/3952—Chemical, mechanical or thermal methods, e.g. oxidation, precipitation, centrifugation
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
    • G03D3/00—Liquid processing apparatus involving immersion; Washing apparatus involving immersion
    • G03D3/02—Details of liquid circulation
    • G03D3/06—Liquid supply; Liquid circulation outside tanks
    • G03D3/065—Liquid supply; Liquid circulation outside tanks replenishment or recovery apparatus

Definitions

  • This invention concerns a method for the re-use of wash water in the photographic field, as set forth in the main claim.
  • the invention concerns also an apparatus suitable to carry out such method.
  • the method and relative apparatus according to this invention are applied conveniently in particular, but not only, to the processes of the development of photosensitive material in black and white or colours and in particular in development dark rooms.
  • Developing machines in the photographic field consist essentially of a set of tanks filled to a constant level, each of the tanks containing a specific solution (developing tanks, stop baths, fixing tanks, etc.) or running water (wash tanks).
  • An automatic conveyor system feeds the sensitive material at a constant speed through the set of various tanks.
  • the sensitive material whether it be a negative or a print, undergoes a set of chemical reactions which modify the composition of the chemical solutions though which it passes, and the wash water.
  • the quantity of reagents which has reacted is in proportion to the surface of sensitive material processed. These reagents are re-introduced into the respective tanks by topping up those tnaks with a suitable quantity of solution proportional to the surface of sensitive material processed.
  • the tanks are kept filled to a constant level by suitable systems with which the developing machine is equipped and which are not described here as they are already known and are not relevant for the purposes of this invention.
  • the wash water is normally discharged and not re-used but cannot be discharged in such a condition as it contains elements not compatible with the environmental regulations in force, which govern the discharges of water into various receiving bodies.
  • the wash water is therefore normally stored temporarily and undergoes, in batches or continuously, treatments of various kinds before being discharged. Reference should be made to US-A-3,997,347 for instance.
  • the state of the art includes apparatuses which can be connected to the developing machines so as to treat the wash water and make it re-usable for further washing operations, but these apparatuses employ techniques of ion exchange, activated carbon and ultra-filtration, with the unsatisfactory result that the developing machines become rather unpractical, complex and not very functional.
  • vacuum distillation systems too exist that enable wash water to be recycled for photographic use.
  • the method and apparatus according to the invention are applied conveniently in particular, but not only, to the processes of development of photosensitive material in black and white or colours and in particular in development dark rooms.
  • This invention enables the water employed to wash the photosensitive material at the end, or in intermediate steps, of the cycle of development of the photosensitive material to be recycled.
  • the invention consists in using solutions to be added to the already used wash water coming from the wash tanks of the developing machines; to be more exact, these solutions contain:
  • the safe-rendering solution contains potassium iodide, tartaric acid, sodium bicarbonate, ethylene diamine sodium tetra-acetate or its derivatives and may also contain a bactericide, such as methanal for instance (commercially known as formaldehyde), whereas the regenerating solution contains potassium iodate and a "pH" stabiliser, such as, for instance, sulphuric acid, caustic soda, hydrochloric acid, acetic acid, caustic potash, calcium hydroxide or another compound having the same functions.
  • a bactericide such as methanal for instance (commercially known as formaldehyde)
  • a "pH" stabiliser such as, for instance, sulphuric acid, caustic soda, hydrochloric acid, acetic acid, caustic potash, calcium hydroxide or another compound having the same functions.
  • composition of such solutions and in particular the potassium iodide and potassium iodate, can also be changed where the nascent iodine required for the reactions is produced with other reagents or indeed through electrolytic, osmotic, galvanic, etc. equipment.
  • the wash water is caused to react with the safe-rendering solution and with the regenerating solution. This reaction may take place in the circulation line if the whole wash water is recirculated.
  • This reaction may also take place for a small part in the circulation line and for the remaining part in the wash tank in cases where only a percentage fraction of the wash water is recirculated. In this case the fraction of the wash water will be supersaturated with the safe-rendering and regenerating solutions.
  • these reactions can take place at different times, for instance by injecting one solution into a possible storage tank and injecting the other solution instead into the circulation line.
  • the wash water is passed through a filter system, which may be merely mechanical and/or may comprise adsorbing cartridges.
  • the solutions can be injected equally well upstream or downstream of the filter system, but this injection is performed advantageously upstream of that system.
  • the apparatus according to the invention is connected hydraulically downstream of the developing machine and comprises within itself not only known pumping and filtration systems but also a dosing system which enables the desired quantities of the above solutions to be injected.
  • automatic regulation of the dosing means is governed by a signal of the flow of water entering the developing machine if that flow is in proportion to the surface of the sensitive material processed.
  • the regulation can be governed by a signal coming from known equipment which is included in the developing machine and which measures the surface of the sensitive material processed by the developing machine.
  • the wash water leaving the apparatus can be recycled to the same developing machine whence the water comes, or can be sent to other developing machines possible connected to the recycling apparatus.
  • a safe-rendering solution A to already used wash water leaving a developing machine 11 are added two solutions, a safe-rendering solution A and a regenerating solution B respectively, to enable that wash water to be re-used to treat further sensitive material.
  • the wash water after use contains substances such as sulphites and thiosulphates coming from the preceding step of fixing the sensitive material, and these substances have to be rendered safe and harmless so that the wash water can be re-used without endangering the successful development of sensitive material processed thereafter.
  • the safe-rendering solution A contains concentrated chemicals able to render safe for photographic purposes the salts and substances such as sulphites, thiosulphates, aluminium, etc. contained in the wash water coming from the preceding fixing step.
  • the safe-rendering solution A contains the following reagents:
  • the quantities of salts and substances such as sulphites, thiosulphates, aluminium, etc. contained in the wash water and coming from the preceding fixing step are in proportion to the surface of sensitive material processed.
  • the invention includes addition of the safe-rendering solution A consisting of the following:
  • This composition can be prepared at various levels of concentration since the solution is immitted into the wash water to be recycled in proportion to the surface of the sensitive material processed.
  • a dosage into wash water ready for the reaction will be: - potassium iodide 0.250 gr/lt - tartaric acid 0.125 gr/lt - EDTANa4 1.000 gr/lt - sodium bicarbonate 0.025 gr/lt - bactericide 0.025 gr/lt
  • the regenerating solution B contains the following reagents:
  • the quantities of substances contained in the wash water, such as carbonates, calcium, magnesium, iron, etc., which are eliminated by the regenerating solution B, are in proportion to the surface of the sensitive material processed.
  • the quantity of the regenerating solution B too to be employed to neutralize the above substances will be in proportion to the surface of the sensitive material processed, and in particular the invention includes addition of regenerating solution B consisting of the following:
  • This composition can be prepared at various levels of concentration since the solution is added to the wash water to be recycled in proportion to the surface of the sensitive material processed.
  • a dosage into wash water ready for the reaction will be: - potassium iodate 0.25 gr/lt - pH stabilizer 0.015 gr/lt
  • composition of the solutions by quantities may vary over a wide range.
  • one litre of safe-rendering solution A will possess the following characteristics: - ingredients: normal min. max. - potassium iodide 50 grs. 35 grs. 65 grs. - tartaric acid 25 grs. 17.5 grs. 32.5 grs. - EDTANa4 or derivatives 200 grs. 140 grs. 260 grs. - sodium bicarbonate 12 grs. 8.4 grs. 15.6 grs. - bactericide 12 grs. 8.4 grs. 15.6 grs. - water in a quantity required to make up 1 litre of solution - relative density from 1.05 to 1.5.
  • one litre of regenerating solution B according to the invention will possess the following characteristics: - ingredients: normal min. max. - potassium iodate 50 grs. 35 grs. 65 grs. - pH stabilizer 3 grs. 2.5 grs. 4 grs. - water in a quantity required to make up 1 litre of solution - relative density from 1.02 to 1.3.
  • the nascent iodine (I2) can be produced also with other reagents and/or with electrolytic, osmotic, galvanic, etc. equipment. If the nascent iodine (I2) is produced with these other methods, the solutions will vary as regards the potassium iodide (KI) and potassium iodate (KIO3).
  • tartaric acid C4H6O6 reacts according to the following reactions:
  • the EDTANa4 reacting with the salts of calcium, magnesium, iron, etc. forms complexes of salts.
  • wash water Downstream or upstream of the processing step the wash water is passed through a filtration system, which may consist of simple mechanical filtering, or be by means of adsorbent cartridges.
  • a filtration system which may consist of simple mechanical filtering, or be by means of adsorbent cartridges.
  • the reference number 10 indicates generally an apparatus to recycle wash water in the photographic field, the apparatus 10 being installed downstream of a developing machine 11.
  • the developing machine 11 consists essentially of a set of tanks filled to a constant level, each tank containing a specific solution (developing tanks, stop baths, fixing tanks, etc.) while the last tank, a wash tank 17, holds water.
  • an automatic conveyor system 19 feeds sensitive material 18 at a set speed through the various successive tanks.
  • the level of water in the wash tank 17 is kept constant in a known manner by immitting fresh water through a water topping-up intake 21 included in the wash tank 17 of the developing machine 11.
  • the developing machine 11 is also equipped in a known manner with a means 32 which measures the surface of the sensitive material processed in the developing machine 11 and visualizes and keeps a total of the value thereof.
  • a signal is emitted by the surface measuring means 32 and regulates the flow of wash water by means of a wash water regulator assembly.
  • the wash tank 17 is also equipped with an overflow 20 and is connected to a used wash water line 23 that connects the developing machine 11 to the wash water recycling apparatus 10.
  • wash tank 17 is equipped with an outlet 22 employed to empty the wash tank 17 whenever necessary.
  • the wash tank 17 may comprise means to recirculate and/or stir the wash water and is also connected to a recycled wash water line 25 arriving from the wash water recycling apparatus 10.
  • shut-off means 15 which enable the wash water recycling apparatus 10 to be isolated from the developing machine 11.
  • a storage tank 12 is also fitted to the used wash water line 23, while a restarting tank 13 is installed on the recycled wash water line 25.
  • the storage tank 12 and restarting tank 13 respectively are equipped with shut-off means 15 to enable these tanks 12-13 to be isolated also during the working of the system consisting of the developing machine 11 and water recycling apparatus 10.
  • the apparatus 10 comprises hydraulic attachment means 24, to which are connected respectively the used wash water line 23 and the recycled wash water line 25.
  • the apparatus 10 to recycle the wash water comprises pump means 28, which serve to restart the feed of the recycled wash water from the apparatus 10 to the developing machine 11 through the recycled wash water line 25, or to other developing machines through a connecting line 16.
  • the apparatus 10 to recycle the wash water is also equipped with filter means 29 through which the wash water is passed.
  • These filter means 29 may be of a mechanical type and/or may also contain adsorbent cartridges.
  • the apparatus 10 comprises also at least two containers, namely a container 26 for solution A and a container 27 for solution B respectively, which feed dosing means 30 that inject into the used wash water the safe-rendering solution A and regenerating solution B respectively.
  • control panel 14 which comprises actuation, control, measurement and regulation means and relative warning lights and alarms.
  • the wash water leaving the wash tank 17 of the developing machine 11 is conveyed to the wash water recycling apparatus 10 through the used wash water line 23.
  • the pump means 28 located in the recycling apparatus 10 feed the recycled wash water through the recycled wash water line 25 towards the wash tank 17 of the developing machine 11, from which that wash water has arrived.
  • the pump means 28 can deliver the recycled wash water towards other developing machines along the connecting line 16.
  • These pump means 28 may be of a self-priming type.
  • the dosing means 30 feed the pump means 28 with the required quantities of solution A and solution B, these quantities being drawn from the respective containers, namely container 26 for solution A and container 27 for solution B.
  • the dosing means 30 are actuated by a dosage regulator assembly 31, which receives signals from the means 32 fitted to the developing machine 11 to measure the surface of the sensitive material processed.
  • this signal can arrive directly from a means that regulates the flow of wash water in the event that the developing machine 11 is equipped with such a means.
  • the wash water thus chemically treated passes through the appropriate filter means 29, which retain the substances contained in the wash water.
  • These filter means 29 may be of a merely mechanical type or may contain adsorbent cartridges.
  • the safe-rendering solution A arriving from its container 26, or else the regenerating solution B arriving from its container 27, is injected in a congruous manner into the storage tank 12, whereas the other solution B or A is immitted in a congruous manner upstream or downstream of the pump means 28.
  • the solution A (or B) is immitted in a congruous manner into the restarting tank 13, whereas the solution B (or A) is immitted in a congruous manner upstream or downstream of the restarting tank 13.
  • the wash water is circulated in a quantity which is a percentage fraction of the quantity of water required to wash the surface developed.
  • wash water is circulated in a quantity which is a minimum percentage fraction of the order of some units.
  • wash water recycled is only a percentage fraction of the whole, then it is supersaturated with the solutions A and B, the reaction being completed in the wash tank 17.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Photographic Processing Devices Using Wet Methods (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)
  • Winding, Rewinding, Material Storage Devices (AREA)
EP92100984A 1991-02-01 1992-01-22 Procédé et appareil pour la récyclage d'eau de lavage, photographique Withdrawn EP0497199A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUD910017 1991-02-01
ITUD910017A IT1247448B (it) 1991-02-01 1991-02-01 Metodo per il riutilizzo acque di lavaggio nel campo fotografico e relativa apparecchiatura.

Publications (1)

Publication Number Publication Date
EP0497199A1 true EP0497199A1 (fr) 1992-08-05

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EP92100984A Withdrawn EP0497199A1 (fr) 1991-02-01 1992-01-22 Procédé et appareil pour la récyclage d'eau de lavage, photographique

Country Status (3)

Country Link
EP (1) EP0497199A1 (fr)
JP (2) JPH0572698A (fr)
IT (1) IT1247448B (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2695218A1 (fr) * 1992-08-25 1994-03-04 Kis Photo Ind Procédé et dispositif de traitement des bains de lavage d'une installation automatique de développement de films négatifs et d'épreuves photographiques sur papier.
FR2773892A1 (fr) * 1998-01-22 1999-07-23 Eastman Kodak Co Procede et dispositif pour le recyclage des eaux de lavage des traitements photographiques
EP0932078A1 (fr) * 1998-01-22 1999-07-28 Eastman Kodak Company Procédé et dispositif pour le recyclage des eaux de lavage des traitements photographiques
FR2786280A1 (fr) * 1998-11-25 2000-05-26 Eastman Kodak Co Procede et dispositif pour le recyclage des eaux de lavage des traitements photographiques
KR20000030123A (ko) * 1999-12-30 2000-06-05 한경민 자동현상기 수세수 처리장치
KR100372861B1 (ko) * 2000-02-22 2003-02-26 (주)가교영상 자동현상기 수세수 처리장치
KR100427811B1 (ko) * 2001-01-10 2004-04-27 김영규 필름현상기용 수세수의 재활용장치의 제어방법

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000030317A (ko) * 2000-02-22 2000-06-05 한경민 자동현상기 수세수 처리장치
DE10034633A1 (de) * 2000-07-17 2002-01-31 Sms Demag Ag Vorrichtung zur Aufnahme und zum Weitertransport von, aus einer Bandwalzstraße oder einem Walzbandlager heran transportierten Walzbandbunden

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3594157A (en) * 1969-08-19 1971-07-20 Eastman Kodak Co Alkaline chlorination of waste photographic processing solutions containing silver
FR2248538A1 (en) * 1973-10-22 1975-05-16 Ciais Angele Photographic film slide or print washing method - involves filtering and adjusting temp. of washing water for recycling
US3997347A (en) * 1974-04-22 1976-12-14 The Mead Corporation Method and apparatus for recycling photographic wash water
DE2850173A1 (de) * 1978-11-18 1980-06-12 Eurograph Gmbh Verfahren und vorrichtung zum regenerieren eines fotochemischen behandlungsbades
US4480901A (en) * 1981-11-27 1984-11-06 Agfa-Gevaert Aktiengesellschaft Arrangement for and a method of processing photosensitive articles
WO1986004522A1 (fr) * 1985-02-01 1986-08-14 Kodak Limited Procede et appareil de melange de produits chimiques liquides
JPH0267547A (ja) * 1988-09-02 1990-03-07 Fuji Photo Film Co Ltd ハロゲン化銀カラー写真感光材料の処理方法
JPH02247642A (ja) * 1989-03-20 1990-10-03 Konica Corp 節水効率を高めかつ優れた帯電防止処理を可能にするハロゲン化銀黒白感光材料の処理方法

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3594157A (en) * 1969-08-19 1971-07-20 Eastman Kodak Co Alkaline chlorination of waste photographic processing solutions containing silver
FR2248538A1 (en) * 1973-10-22 1975-05-16 Ciais Angele Photographic film slide or print washing method - involves filtering and adjusting temp. of washing water for recycling
US3997347A (en) * 1974-04-22 1976-12-14 The Mead Corporation Method and apparatus for recycling photographic wash water
DE2850173A1 (de) * 1978-11-18 1980-06-12 Eurograph Gmbh Verfahren und vorrichtung zum regenerieren eines fotochemischen behandlungsbades
US4480901A (en) * 1981-11-27 1984-11-06 Agfa-Gevaert Aktiengesellschaft Arrangement for and a method of processing photosensitive articles
WO1986004522A1 (fr) * 1985-02-01 1986-08-14 Kodak Limited Procede et appareil de melange de produits chimiques liquides
JPH0267547A (ja) * 1988-09-02 1990-03-07 Fuji Photo Film Co Ltd ハロゲン化銀カラー写真感光材料の処理方法
JPH02247642A (ja) * 1989-03-20 1990-10-03 Konica Corp 節水効率を高めかつ優れた帯電防止処理を可能にするハロゲン化銀黒白感光材料の処理方法

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 14, no. 574 (P-1145)20 December 1990 & JP-A-2 247 642 ( FUJI PHOTO FILM CO. LTD. ) 3 October 1990 *
SMPTE JOURNAL vol. 85, no. 3, March 1976, US pages 154 - 159; M.W.BEACH: 'MICROBIAL GROWTHS IN MOTION-PICTURE PROCESSING' *
WORLD PATENTS INDEX LATEST Section PQ, Week 9016, Derwent Publications Ltd., London, GB; Class P83, AN 90-118793 & JP-A-2 067 547 (FUJI PHOTO FILM CO. LTD.) 7 March 1990 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2695218A1 (fr) * 1992-08-25 1994-03-04 Kis Photo Ind Procédé et dispositif de traitement des bains de lavage d'une installation automatique de développement de films négatifs et d'épreuves photographiques sur papier.
FR2773892A1 (fr) * 1998-01-22 1999-07-23 Eastman Kodak Co Procede et dispositif pour le recyclage des eaux de lavage des traitements photographiques
EP0932078A1 (fr) * 1998-01-22 1999-07-28 Eastman Kodak Company Procédé et dispositif pour le recyclage des eaux de lavage des traitements photographiques
US6010833A (en) * 1998-01-22 2000-01-04 Eastman Kodak Company Process and device for recycling washing water in photographic processing
US6117315A (en) * 1998-01-22 2000-09-12 Eastman Kodak Company Process and device for recycling washing water in photographic processing
FR2786280A1 (fr) * 1998-11-25 2000-05-26 Eastman Kodak Co Procede et dispositif pour le recyclage des eaux de lavage des traitements photographiques
KR20000030123A (ko) * 1999-12-30 2000-06-05 한경민 자동현상기 수세수 처리장치
KR100372861B1 (ko) * 2000-02-22 2003-02-26 (주)가교영상 자동현상기 수세수 처리장치
KR100427811B1 (ko) * 2001-01-10 2004-04-27 김영규 필름현상기용 수세수의 재활용장치의 제어방법

Also Published As

Publication number Publication date
ITUD910017A1 (it) 1992-08-01
JPH0572698A (ja) 1993-03-26
IT1247448B (it) 1994-12-17
ITUD910017A0 (it) 1991-02-01
JPH05200433A (ja) 1993-08-10

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