DE2332856A1 - Electrolytic flotation - for effluent purification using mobile electrodes - Google Patents

Electrolytic flotation - for effluent purification using mobile electrodes

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Publication number
DE2332856A1
DE2332856A1 DE19732332856 DE2332856A DE2332856A1 DE 2332856 A1 DE2332856 A1 DE 2332856A1 DE 19732332856 DE19732332856 DE 19732332856 DE 2332856 A DE2332856 A DE 2332856A DE 2332856 A1 DE2332856 A1 DE 2332856A1
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Germany
Prior art keywords
electrodes
flotation
deposits
electrolytic flotation
turbidity
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Granted
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DE19732332856
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German (de)
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DE2332856C3 (en
DE2332856B2 (en
Inventor
Kurt Xylander
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Priority to DE19732332856 priority Critical patent/DE2332856C3/en
Priority to FR7422787A priority patent/FR2234929B1/fr
Priority to GB2885674A priority patent/GB1473580A/en
Priority to CH896874A priority patent/CH581078A5/xx
Priority to IT2452374A priority patent/IT1019671B/en
Publication of DE2332856A1 publication Critical patent/DE2332856A1/en
Publication of DE2332856B2 publication Critical patent/DE2332856B2/en
Application granted granted Critical
Publication of DE2332856C3 publication Critical patent/DE2332856C3/en
Expired legal-status Critical Current

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Classifications

    • 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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1437—Flotation machines using electroflotation
    • 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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/465—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electroflotation
    • 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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
    • 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
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • 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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
    • C02F2001/46119—Cleaning the electrodes
    • 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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
    • C02F2001/46123—Movable electrodes
    • 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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
    • C02F2001/46133—Electrodes characterised by the material
    • 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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
    • C02F2001/46152—Electrodes characterised by the shape or form

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Biotechnology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Organic Chemistry (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)

Abstract

Electrolytic flotation, e.g., in the treatment of effluent, in which at least one electrode or group of electrodes of the same polarity is transported under the applied potential into and/or through the suspension. The life time of the electrodes is increased and the problem of cleaning off deposits is largely eliminated or simplified.

Description

Kurt Xylander 26. Juni 1973 Me/diKurt Xylander June 26, 1973 Me / di

639 Hattersheim 639 Hattersheim

Verfahren zur Durchführung der elektrolytischen FlotationProcess for carrying out electrolytic flotation

Die Erfindung bezieht sich auf eine Verbesserung der Durchführung von Flotationsvorgängen auf elektrochemischem Wege wie auch auf die Erhöhung der Lebensdauer der Elektroden.The invention relates to an improvement in the performance of flotation operations by electrochemical means as well as increasing the service life of the electrodes.

In letzter Zeit hat die Flotation in verstärktem Maße Eingang in die Wasser/Abwassertechnik gefunden. Vergleicht man die Flotationsverfahren mit den sonst üblichen Absetzverfahren, so ergibt sich durch die Flotation meistens ein besserer Reinigungseffekt und ein geringerer Schlammanfall bei kleiner Anlagengrösse. Recently, flotation has increasingly found its way into water / wastewater technology. If you compare the Flotation processes with the otherwise customary settling process, the flotation usually results in a better cleaning effect and less sludge accumulation with a small system size.

Eine Sonderstellung bei Flotationsverfahren nehmen solche Verfahren ein, bei denen Gasblasen elektrolytisch erzeugt werden. An die in der Trübe befindlichen, bisher starr ausgebildeten Elektroden wird eine elektrische Spannung angelegt, wodurch in der Flüssigkeit befindliche Ionen entsprechend ihrer Ladung zu den entgegengesetzt geladenen Elektroden wandern und hier direkt oder über chemische Reaktionen feine Gasblasen bilden.Such processes have a special position in flotation processes in which gas bubbles are generated electrolytically. To those in the murky, previously rigidly trained An electrical voltage is applied to the electrodes, causing the ions in the liquid to increase according to their charge migrate to the oppositely charged electrodes and form fine gas bubbles here directly or through chemical reactions.

Die Menge der Gasblasen lässt sich dabei auf einfache Weise variieren.The amount of gas bubbles can be varied in a simple manner.

Durch Erhöhung der angelegten Spannung nimmt die Menge der Gasblasen zu, durch Erniedrigen nimmt die Gasblasenmenge ab.By increasing the applied voltage, the amount of gas bubbles increases to, by decreasing the amount of gas bubbles decreases.

Neben den Ionen, die nach Neutralisation ihrer elektrischenIn addition to the ions that after neutralization of their electrical

— 2 —- 2 -

409882/1016409882/1016

Ladung Gase bilden, wandern in dem elektrischen Feld jedoch auch Ionen, die nach Neutralisation ihrer Ladung feste ungelöste Stoffe bilden. Desgleichen wandern in dem elektrischen Feld ladungstragende kolloid und grob disperse Teilchen.Charge gases form, but also migrate in the electric field Ions that form solid, undissolved substances after their charge has been neutralized. Likewise wander in the electric field charge-carrying colloid and coarse particles.

Diese drei zuletzt genannten: Ionen, die ungelöste Stoffe bilden, kolloid und grob disperse Teilchen, lagern sich auf Elektroden ab und bilden einen mehr oder weniger dichten Überzug.These last three: ions, which form undissolved substances, colloidal and coarse dispersed particles, are deposited on electrodes and form a more or less dense coating.

In vielen Fällen kommt es nur auf der Kathode zu Ablagerungen. Durch die Ablagerungen wird die Leitfähigkeit zwischen den Elektroden zunächst kaum beeinträchtigt. Erst mit zunehmender Überziehung der Elektrode tritt eine isolierende Wirkung ein. Die Ablagerungen sind rauh und porig, zum Teil Hydrophole. Das entstehende Gas haftet jetzt stärker an der Elektrode. Erst wenn sich eine grosse Gasbisse gebildet hat, kommt es zur Ablösung von der Elektrode. Es entstehen keine feinen Gasblasen mehr sondern Gasblasen von zunehmend grösseren Dimensionen, die schlecht bzw. ungeeignet sind für Flotationszwecke.In many cases, deposits only appear on the cathode. The deposits increase the conductivity between the Electrodes hardly affected at first. An insulating effect only occurs as the electrode becomes increasingly overdrawn. The deposits are rough and porous, some of them are hydrophilic. The resulting gas now adheres more strongly to the electrode. Only when If a large gas bite has formed, the electrode becomes detached. There are no more fine gas bubbles but gas bubbles of increasingly larger dimensions that are poor or unsuitable for flotation purposes.

Weiterhin wirken sich die Ablagerungen sehr negativ aus auf die Lebensdauer der Elektroden, die einen erheblichen Anlagenkosten-Faktor darstellen.Furthermore, the deposits have a very negative effect on the service life of the electrodes, which is a considerable factor in the system costs represent.

Dichter werdende Ablagerungen verkürzen zunehmend die Lebensdauer der Elektroden. Besonders kritisch wird es, wenn die Ablagerungen zwischen Anode und Kathode Brücken bilden, was leicht geschehen kann, da die Abstände zwischen Kathode und Anode möglichst klein gehalten werden, um mit geringen Stromkosten auszukommen .Deposits that become more dense increasingly shorten the service life of the electrodes. It becomes particularly critical when the deposits form bridges between anode and cathode, which can easily be done because of the gaps between cathode and anode be kept as small as possible in order to get by with low electricity costs .

In der Praxis verursachen die Ablagerungen, werden sie nicht rechtzeitig entfernt, eine zunehmende Störung bzw. ein völliges Erliegen der Flotation und eine schnelle Zerstörung der Elektroden. In practice, if the deposits are not removed in time, they will cause an increasing disruption or even a complete one Succession to flotation and rapid destruction of the electrodes.

- 5 409882/1016 - 5 409882/1016

Um die Ablagerungen zu entfernen, ist bei den bisherigen Verfahren zur Ausübung der elektrochemischen Flotation folgender Arbeitsablauf notwendig:In order to remove the deposits, is with the previous procedure The following workflow is necessary to carry out electrochemical flotation:

1. Ablassen der Trübe; der noch auf der Oberfläche befindliche Schlamm verschmiert dabei die gesamte Behälterwandung .1. Drain the turbidity; the sludge still on the surface smears the entire container wall .

2. Ausbauen der Elektroden.2. Remove the electrodes.

3. Reinigen der Elektroden mit chemischen und/oder mechanischen Mitteln. Die Ablagerung kann dabei so fest sein, dass die Anwendung von Drahtbürsten erforderlich ist.3. Cleaning the electrodes with chemical and / or mechanical means. The deposit can be so solid be that the use of wire brushes is required.

4-, Reinigen des Flotationsbehälters. 5. Einbau der Elektroden.4-, cleaning the flotation tank. 5. Installation of the electrodes.

Diese zur Reinigung der Elektroden notwendigen Arbeiten können je nach Verschmutzung und Grosse der Elektroden mehrere Stunden dauern und müssen mitunter täglich ausgeführt werden. Während dieser Zeit fällt die entsprechende Flotationsanlage aus.This work necessary to clean the electrodes can take several hours, depending on how dirty the electrodes are and how large they are take time and sometimes have to be carried out on a daily basis. During this time, the corresponding flotation plant fails.

Demgegenüber liegt der Erfindung die Aufgabe zugrunde, die insbesondere bei der Behandlung von Abwasser unvermeidlichen Ablagerungen wesentlich zu mindern und eine Brückenbildung zwischen Anode und Kathode völlig zu verhindern. Bei Untersuchungen bzw. Versuchen, die sich über einen längeren Zeitraum erstreckten, hat sich gezeigt, dass die Ablagerungen, welche die Elektroden überziehen, vollständig verhindert werden bzw. zumindest erheblich vermindert werden, wenn Anode und Kathode nicht gleichbleibende Stellungen zueinander einnehmen sondern ihre gegenseitige Stellung ändern.In contrast, the invention is based on the object, in particular in the treatment of wastewater to significantly reduce deposits and build bridges between anode and cathode to be completely prevented. For examinations or experiments that take place over a longer period of time extended, it has been shown that the deposits that cover the electrodes are completely prevented or can at least be considerably reduced if the anode and cathode do not occupy constant positions relative to one another but change their position on one another.

Erfindungsgemäss wird die Aufgabe dadurch gelöst, dass manAccording to the invention the object is achieved in that one

409882/1016409882/1016

während des Flotierungsvorganges mindestens eine der Elektroden oder gleichpolige Elektrodengruppen bei angelegter Spannung in der und/oder durch die Trübe führt. Man kann beispielsweise eine der Elektroden, meist die Anode, stationäre fest anbringen und die zweite Elektrode durch die Trübe bzw. in der Trübe kontinuierlich bzw. diskontinuierlich führen. Man kann auch beide Elektroden mit unterschiedlicher Geschwindigkeit oder in unterschiedlichen Zeitintervallen durch die Trübe transportieren. Verwendet man dazu noch Elektroden, die so gestaltet sind, dass sie an beliebiger Stelle oder an Stellen, die durch Gelenke oder biegsame Zwischenstücke gekennzeichnet sind, nach einer oder mehreren Seiten flexibel, krümtnbar, biegbar beweglich sind, so ergibt sich die Möglichkeit, eine oder beide Elektroden bei angelegter Spannung schräg bis vertikal in die Trübe einzuführen, nach Erreichen der vorgesehenen Tiefe in eine horizontale oder annähernd horizontale Lage umzulenken, durch die Trübe zu führen und wieder umzulenken und in einer schrägen bis vertikalen Lage aus der Trübe herauszuführen. Das Bewegen einer bzw. der Elektroden in der Trübe erfolgt bei angelegter Spannung, d.h. laufender Flotation. Erfindungsgemäss ergibt sich die Möglichkeit, die Elektroden bei ungestörter Flotation ausserhalb der Trübe ständig von jeglichen Ablagerungen zu befreien.at least one of the electrodes during the floatation process or homopolar electrode groups with applied voltage in and / or through the pulp. One can for example one of the electrodes, usually the anode, is fixed in place and the second electrode through the slurry or in the slurry lead continuously or discontinuously. You can also use both electrodes at different speeds or in transport through the slurry at different time intervals. If you also use electrodes that are designed in such a way that they can be placed at any point or at points through joints or flexible intermediate pieces are marked, are flexible, bendable, bendable movable on one or more sides, this gives the possibility of inserting one or both electrodes obliquely or vertically into the pulp with the voltage applied, after reaching the intended depth to divert into a horizontal or approximately horizontal position, through the Leading and redirecting turbidity and leading it out of the turbidity in an inclined to vertical position. Moving one or the electrodes in the pulp takes place with applied voltage, i.e. ongoing flotation. According to the invention there is the possibility of to constantly free the electrodes of any deposits with undisturbed flotation outside the pulp.

Anode und/oder Kathode können dabei als geschlossenes Band ausgeführt sein. Ebenso können sie aus zusammenkoppelbaren Einzelstücken bestehen. Die Reinigung kann manuell erfolgen, lässt sich jedoch auch leicht automatisch durchführen, wenn z.B. die Elektroden zwischen rotierenden Bürsten durchlaufen und/oder durch Bäder transportiert werden, die eine Reinigungslösung enthalten. The anode and / or cathode can be designed as a closed band be. They can also consist of individual pieces that can be coupled together. The cleaning can be done manually however, they can also easily be carried out automatically if, for example, the electrodes pass between rotating brushes and / or be transported through baths that contain a cleaning solution.

Es wurden Vergleichsversuche durchgeführt mit Flotationszellen, bei denen die Elektroden fest eingebaut sind und mit Zellen, bei denen die Elektroden in der bzw. durch die Trübe transportiert wurden.Comparative tests were carried out with flotation cells, in which the electrodes are permanently installed and with cells in which the electrodes are transported in or through the slurry became.

— 5 -409882/1016- 5 -409882/1016

5 - 23378565 - 2337856

Für die Flotationsversuche wurde sowohl Industrieabwasser als auch Kanalabwasser verwendet, kolloid disperse Inhaltstoffe wurden zuvor an ausgefülltem Aluminium bzw. Eisenhydroxyd sorbiert. Both industrial wastewater and Sewer wastewater is also used; colloidally dispersed ingredients were previously sorbed on filled aluminum or iron hydroxide.

Bei den Flotationsversuchen mit fest eingebauten Elektroden ergab sich eine mittlere Unterbrechung der Flotation von 11 see. pro Kubikmeter flotierter Flüssigkeit und die Elektroden mussten nach einer Belastung von 3600 nr pro Quadratmeter Elektrodenfläche erneuert werden.In the flotation tests with built-in electrodes, there was an average interruption of the flotation of 11 seconds. per cubic meter of floated liquid and the electrodes had to be after a load of 3600 nr per square meter Electrode surface must be renewed.

Die Flotation nach der Erfindung konnte kontinuierlich ohne Unterbrechung durchgeführt werden und die Elektroden zeigten nach einer Belastung von 5000 or pro Quadratmeter keine Verschleisserscheinungen. The flotation according to the invention could be carried out continuously without interruption and the electrodes showed no signs of wear after a load of 5000 or per square meter.

409882/1016409882/1016

Claims (4)

Kurt Xylander 26. Juni 1973 Me/diKurt Xylander June 26, 1973 Me / di HattersheimHattersheim Schutzansprüche:Protection claims: l.)< Verfahren zur Durchfüimmg der elektrolytischen Flotation, dadurch gekennzeichnet,l.) <Procedure for performing electrolytic flotation, characterized, dass man während des Flotierungsvorganges mindestens eine der Elektroden oder gleichpolige Elektrodengruppen bei angelegter Spannung in der \ind/oder durch die Trübe führt.that at least one the electrodes or homopolar groups of electrodes with applied voltage in the \ ind / or through the turbidity. 2.) Verfahren nach Anspruch 1,
dadurch gekennzeichnet,2.) Method according to claim 1,
characterized, dass man die bewegten Elektroden mit verschiedenen Geschwindigkeiten und/oder in unterschiedlichen Zeitintervallen in der und/oder durch die Trübe führt.that you can move the electrodes at different speeds and / or at different time intervals in and / or through the turbidity. 3·) Verfahren nach den Ansprüchen 1 und/oder 2, gekennzeichnet durch3 ·) Process according to claims 1 and / or 2, characterized by Verwendung von Elektroden, die in sich mindestens teilweise biegsam ausgebildet sind.Use of electrodes which are designed to be at least partially flexible in themselves. 4.) Verfahren nach den Ansprüchen 1-3» dadurch gekennzeichnet,4.) Process according to claims 1-3 »characterized in that dass man eine oder beide Elektroden schräg oder vertikal in die Trübe einführt, nach Erreichen der vorgesehenen Tiefe in eine horizontale bzw. annähernd horizontale Lage umlenkt, durch die Trübe führt und wieder umlenkt und in einer schrägen bis vertikalen Lage aus der Trübe herausführt.that one or both electrodes are inserted obliquely or vertically into the sludge after reaching the intended depth deflects into a horizontal or approximately horizontal position, leads through the sludge and deflects again and in one inclined to vertical position out of the slurry. 409882/1016409882/1016
DE19732332856 1973-06-28 1973-06-28 Process for the purification of waste water or similar liquids by flotation and device for carrying out the process Expired DE2332856C3 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE19732332856 DE2332856C3 (en) 1973-06-28 1973-06-28 Process for the purification of waste water or similar liquids by flotation and device for carrying out the process
FR7422787A FR2234929B1 (en) 1973-06-28 1974-06-28
GB2885674A GB1473580A (en) 1973-06-28 1974-06-28 Electrolytic flotation process and apparatus
CH896874A CH581078A5 (en) 1973-06-28 1974-06-28
IT2452374A IT1019671B (en) 1973-06-28 1974-06-28 DEVICE FOR PURIFYING WASTE WATER OR SIMILAR LIQUIDS THROUGH FLOTATION

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732332856 DE2332856C3 (en) 1973-06-28 1973-06-28 Process for the purification of waste water or similar liquids by flotation and device for carrying out the process

Publications (3)

Publication Number Publication Date
DE2332856A1 true DE2332856A1 (en) 1975-01-09
DE2332856B2 DE2332856B2 (en) 1975-04-24
DE2332856C3 DE2332856C3 (en) 1975-11-27

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DE19732332856 Expired DE2332856C3 (en) 1973-06-28 1973-06-28 Process for the purification of waste water or similar liquids by flotation and device for carrying out the process

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1302445A2 (en) * 2001-07-09 2003-04-16 Arturo Guerini Device and process for oxygenating an aqueous solution by electrolysis

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1302445A2 (en) * 2001-07-09 2003-04-16 Arturo Guerini Device and process for oxygenating an aqueous solution by electrolysis
EP1302445A3 (en) * 2001-07-09 2004-01-02 Arturo Guerini Device and process for oxygenating an aqueous solution by electrolysis

Also Published As

Publication number Publication date
DE2332856C3 (en) 1975-11-27
DE2332856B2 (en) 1975-04-24

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