EP2526066A1 - Procédé de traitement d'un fluide aqueux - Google Patents

Procédé de traitement d'un fluide aqueux

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Publication number
EP2526066A1
EP2526066A1 EP11703270A EP11703270A EP2526066A1 EP 2526066 A1 EP2526066 A1 EP 2526066A1 EP 11703270 A EP11703270 A EP 11703270A EP 11703270 A EP11703270 A EP 11703270A EP 2526066 A1 EP2526066 A1 EP 2526066A1
Authority
EP
European Patent Office
Prior art keywords
aqueous fluid
treated
electrochemical cell
compartment
anode
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Withdrawn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
EP11703270A
Other languages
German (de)
English (en)
Inventor
Roel Johannes Martinus Bisselink
Joost Van Erkel
Norbertus Jozef Maria Kuipers
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.)
Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
Original Assignee
Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
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 Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO filed Critical Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
Priority to EP11703270A priority Critical patent/EP2526066A1/fr
Publication of EP2526066A1 publication Critical patent/EP2526066A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • 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
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • 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
    • C02F1/24—Treatment of water, waste water, or sewage by flotation
    • 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
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • 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
    • C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
    • 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
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/4602—Treatment of water, waste water, or sewage by electrochemical methods for prevention or elimination of deposits
    • 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
    • C02F1/4618—Devices therefor; Their operating or servicing for producing "ionised" acidic or basic water
    • 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
    • C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
    • C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
    • 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
    • C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
    • C02F1/4676—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electroreduction
    • 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
    • C02F2103/02—Non-contaminated water, e.g. for industrial water supply
    • C02F2103/023—Water in cooling circuits
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH

Definitions

  • the invention is directed to methods for treating an aqueous fluid comprising one or more electrolytes.
  • anti-scaling agents typically contain acids such as acetic acid, lactic acid, citric acid, phosphoric acid, hydrochloric acid, and sulphamic acid to remove scale.
  • the anti-scaling agents can further contain chelating agents (such as
  • US-A-2009/0 071 843 describes a method for scale prevention in which an electrolyte is circulated through one compartment of an electrolytic cell, while a raw water supply stream is run through the other compartment of the electrolytic cell, the two compartments being separated by an ion permeable diaphragm.
  • EP-A-0 839 762 describes a method and apparatus for scale prevention in producing deionised water.
  • acidic water is produced in the anode compartment of the electrolysis unit.
  • the acidic water stream then enters a continuous
  • deionization unit Deionised acidic water is discharged, whereas concentrated acidic water is recycled to the electrolysis unit, supplemented with water from a water supply line. Hence, this water is acidic.
  • the water supply for the electrolysis unit not only enters the anode compartment, but also the cathode compartment.
  • a disadvantage thereof is that the product to waste ratio is rather low. A major part of the water supply directly enters the cathode compartment to form a water waste stream, whereas only a minor part exits the anode compartment to enter the electrodialysis unit, where the deionised product stream is formed.
  • One objective of the invention is therefore to provide a method for treating an aqueous fluid, wherein scaling is avoided or at least reduced.
  • the inventors further realised that temporarily reducing the pH of an aqueous fluid may be advantageous for many other processes or treatments that are not necessarily related to scaling.
  • the invention can be employed.
  • processes include biological and biochemical processes ⁇ e.g. the temporary change of pH may have a specific effect on the activity of certain bacteria or enzymes in the feed), chemical processes ⁇ e.g. pasteurisation, amino acid dissolution and dissociation, influencing colloid stability, influencing reaction rates, influencing zeta potentials, etc.), physical processes (storage, mixing, dispersing, stabilisation, transport, heat/cold transfer processes) and separation processes.
  • separation processes the temporary change of pH can be exploited to optimise the performance of the separation step, whereas the change to the original pH can be utilised for the recovery of a mass-separating agent, thus integrating separation and recovery in a single electrochemical cell.
  • the invention is directed to a method for treating an aqueous fluid comprising one or more electrolytes, said method comprising:
  • the treatment generating at least treated acidic aqueous fluid; feeding at least part of the treated acidic aqueous fluid into a cathode compartment of the same electrochemical cell, wherein at the cathode water is reduced to thereby generate a treated aqueous fluid that has a pH which is higher than the treated acidic aqueous fluid,
  • the anode compartment and the cathode compartment of the electrochemical cell are separated by an ion permeable separator, and wherein the aqueous fluid feed has a pH in the range of 4- 12, preferably in the range of 6- 10, more preferably in the range of 7-9, when entering the anode compartment, and
  • said treatment comprises one or more selected from the group consisting of osmosis, reverse osmosis, membrane distillation, electrodialysis, heating, evaporation, boiling, distillation, advanced distillation, absorption, stripping, extraction, pumping, leaching, washing, dissolution, chemical stabilisation or destabilisation, adsorption, ion exchange, drying,
  • the pH of the aqueous fluid feed is temporarily decreased using an anode compartment of an electrochemical cell in order for the aqueous fluid to undergo a specific treatment wherein e.g. scaling is prevented or at least reduced.
  • the pH of the treated aqueous fluid is raised using a cathode compartment of the same electrochemical cell.
  • the anode compartment and the cathode compartment are separated by an ion permeable separator.
  • the ion permeable separator may be an ion selective membrane or a non ion selective membrane.
  • FIG. 1 This aspect of the invention is exemplified by the schematic picture in Figure 1.
  • an aqueous fluid feed to be treated 1 is supplied into an anode compartment 2.
  • Acidic aqueous fluid to be treated 3 exits the anode compartment 2 and is subjected to a treatment 4.
  • treated acidic aqueous fluid 5 is introduced into cathode compartment 6.
  • treated aqueous fluid 7 having a pH higher than the treated acidic aqueous fluid 5 exits the cathode compartment 6.
  • Anode compartment 2 and cathode compartment 6 are separated by ion permeable separator 8.
  • the amount of equipment needed for performing the method of the invention is minimal.
  • the invention allows aqueous fluid to be treated in a highly efficient and effective manner, whereby the pH is temporarily lowered e.g. in order to prevent scaling during the treatment.
  • the composition of the aqueous fluid to be treated (concentration of minerals and organic substances) is not changed.
  • the invention can particularly advantageously be employed for reducing scale in humidifiers and cooling towers.
  • aqueous fluid as used in this application is meant to refer to any fluid that comprises water.
  • the aqueous fluid can be water, but may also be any solution, suspension and/or dispersion that comprises water.
  • the "aqueous fluid” can comprise seawater or brine.
  • the aqueous fluid feed when entering the anode compartment of the electrochemical cell the aqueous fluid feed has a pH in the range of 4-12, preferably in the range of 6-10, more preferably in the range of 7-9.
  • substantially no treated acidic aqueous fluid enters the anode compartment of the electrochemical cell. In an embodiment, this is 5 wt.% or less of the produced treated acidic aqueous fluid, more preferably 2 wt.% or less, even more preferably 1 wt.% or less.
  • substantially the entire aqueous fluid feed is supplied into the anode. In an embodiment, this is 95 wt.% or more of the aqueous fluid feed, preferably 98 wt.% or more, even more preferably 99 wt.% or more.
  • the aqueous fluid to be treated comprises one or more electrolytes.
  • the one or more electrolytes can be selected from the group consisting from dissolved salts, weak acids, weak bases and their dissociation products.
  • the one or more electrolytes can, for instance, comprise one or more selected from a carbonate salt, a bicarbonate salt, a hydroxide salt, a halogenite, a hypochlorite ion, an oxide, a hydride, a sulphate salt, a bisulphate salt, a sulphite salt, a sulphide, a nitrate, a nitrite, hydrogen phosphate, dihydrogen phosphate and trihydrogen phosphate, cyanurate ions, actinide ions, hydrogen fluoride, hydrogen chloride, hypochlorous acid, hydrochloric acid, formic acid, acetic acid, propionic acid, cyanuric acid, benzoic acid, oxalic acid, ammonia,
  • the aqueous fluid is acidified.
  • the acidic aqueous fluid is able to e.g. convert carbonate ions that can give rise to lime scale in gaseous or dissolved carbon dioxide according to equation (2).
  • the oxidation process in the anode compartment reduces the concentration of ions that give rise to scale. Therefore, the aqueous fluid exiting the anode compartment can be treated in an efficient manner.
  • the acidic aqueous fluid to be treated that exits the anode compartment can suitably have a pH value in the range of 2-9, such as in the range of 2-6 or 4-9, preferably in the range of 4-6.
  • part of the aqueous fluid to be treated can then e.g. join the acidic aqueous fluid to be treated.
  • a cation exchange membrane is positioned in between the anode and the ion permeable separator. Positively charged protons generated at the anode can then readily pass this membrane, whereas negatively charged ions (such as chlorine ions) cannot pass the membrane (hence the membrane is anion impermeable).
  • This additional cation exchange membrane is able to prevent chloride transport to the anode and thereby avoid the production of chlorine gas at this electrode.
  • the anode compartment is preferably filled with an aqueous solution of sodium sulphate (Na2S04) rather than an aqueous solution of sodium chloride (NaCl) in order to further reduce the production of chlorine gas.
  • FIG. 2 A schematic picture of this special embodiment is shown in Figure 2.
  • an aqueous fluid feed to be treated 1 is supplied into an anode compartment 2.
  • Acidic aqueous fluid to be treated 3 exits the anode
  • anode compartment 2 is divided in a compartment 2a (which comprises the anode) and a compartment 2b (to which the aqueous fluid feed is fed) by cation exchange membrane 9.
  • Cation exchange membrane 9 is preferably a H + -permeable membrane, which is impermeable for anions such as chloride ions.
  • Compartment 2a can comprise a solution of sodium sulphate in order to further reduce (or prevent) chlorine gas generation.
  • the treatment can comprise a dewatering technology and/or water treatment technology. It is also possible that the treatment involves other components in the feed than water.
  • the treatment comprises one or more selected from the group consisting of osmosis (including advanced non-conventional osmosis processes), reverse osmosis, membrane distillation, electrodialysis, heating, evaporation, boiling, distillation, advanced distillation, absorption, stripping, extraction, pumping, leaching, washing, dissolution, chemical stabilisation or destabihsation (e.g. by chelation, complexation, reaction), adsorption, ion exchange, drying, crystallisation, filtration and membrane filtration.
  • osmosis including advanced non-conventional osmosis processes
  • reverse osmosis membrane distillation
  • electrodialysis heating, evaporation, boiling, distillation, advanced distillation, absorption, stripping, extraction, pumping, leaching, washing, dissolution, chemical stabilisation or destabihsation (e.
  • the treatment comprises a Memstill ® membrane distillation process as described in WO-A-00/72947, which is herewith incorporated by reference.
  • the treatment comprises reverse osmosis.
  • the treatment generates at least treated acidic aqueous fluid. This can, for instance, be a product stream of treated acidic aqueous fluid.
  • At least part of the acidic treated aqueous fluid is fed into a cathode compartment of the electrochemical cell.
  • the aqueous fluid is alkalised, i.e. the pH value of the aqueous fluid is increased.
  • the pH is increased to the same value as the pH of the aqueous fluid feed to be treated.
  • the treated aqueous fluid that exits the cathode compartment can suitably have a pH value in the range of 4-12, such as in the range of 6-10 or 7-10, preferably in the range of 7-9.
  • the anode compartment and the cathode compartment of the electrochemical cell are separated by an ion permeable separator (e.g. a membrane or diaphragm), which allows ion transport from the anode compartment to the cathode compartment and vice versa.
  • the ion permeable separator can, for example, be an anion-exchange membrane, which allows electrical neutrality by migration of negatively charged ions (such as CI ) to the anode.
  • the ion permeable separator can also be a cation-exchange membrane which allows electrical neutrality by migration of positively charged ions (such as Na + ) to the cathode.
  • the ion permeable separator can be any combination of anion-exchange and cation-exchange membranes.
  • the electrochemical cell comprises an electrolyte
  • the electrolyte may have an additional function.
  • this can for example be a disinfecting function, due to the formation of HCI/CI2 in the anode compartment.
  • an electrolyte different from NaCl is preferred, for instance when the production of CI2 is not desired.
  • gases formed in the anode compartment are removed and/or collected. Such gases can for instance comprise CO2 and/or CI2. Gaseous CO2 may be formed in the anode compartment according to equation (2) above.
  • the removal of CO2 in accordance with this embodiment can be advantageous, because it can, for instance, reduce or prevent scale formation in the cathode compartment of the electrochemical cell.
  • Gaseous CI2 may be formed in the anode as a result of electrolysis of CI " .
  • the removal and/or collection of gases can be performed e.g. by maintaining the electrochemical cell at underpressure, or by flushing the electrochemical cell for example with a nitrogen flow.
  • the invention is directed to a method for treating an aqueous fluid comprising one or more electrolytes, said method comprising supplying at least part of an aqueous fluid feed to be treated into an anode compartment of an electrochemical cell, wherein at the anode water is oxidised to thereby generate acidic aqueous fluid to be treated; feeding at least part of the acidic aqueous fluid to be treated into a cathode compartment of the same electrochemical cell, wherein at the cathode water is reduced to thereby generate aqueous fluid to be treated that has a pH which is higher than the acidic aqueous fluid to be treated; and
  • anode compartment and the cathode compartment of the electrochemical cell are separated by an ion permeable separator, and wherein said treatment comprises one or more selected from the group consisting of osmosis, reverse osmosis, membrane distillation, electrodialysis, heating, evaporation, boiling, distillation, advanced distillation, absorption, stripping, extraction, pumping, leaching, washing, dissolution, chemical stabilisation or destabilisation, adsorption, ion exchange, drying,
  • scaling in the cathode compartment can be prevented or at least reduced.
  • the method can be further improved by removing or collecting carbon dioxide from the anode compartment, such as by removing and/or collecting gas generated in anode compartment which gas comprises carbon dioxide.
  • the acidic aqueous fluid to be treated which is fed to the cathode compartment may be supplemented with a supply of aqueous fluid feed, which may or may not be the same aqueous fluid feed which is supplied to the anode compartment.
  • FIG. 3 An example of this aspect of the invention is schematically shown in Figure 3.
  • an aqueous fluid feed to be treated 11 is supplied into an anode compartment 12.
  • Gas formed in anode compartment 12 (such as carbon dioxide) can be removed through outlet 18.
  • Acidic aqueous fluid to be treated 13 exits anode compartment 12 and is introduced into cathode compartment 14.
  • cathode compartment 14 aqueous fluid to be treated 15 is generated, which has a pH that is higher than the acidic aqueous fluid to be treated 13.
  • the aqueous fluid to be treated 15 is subjected to treatment 16.
  • Anode compartment 12 and cathode compartment 14 are separated by ion permeable separator 17.
  • the one or more electrolytes are the same as defined above.
  • the treatment can be any one of the treatments as mentioned herein.
  • Further objective of the invention is to provide a method for treating an aqueous fluid wherein the pH of an aqueous fluid feed is temporarily increased, e.g. in order to promote precipitation of salts.
  • the inventors found that this objective can advantageously be met by reversing the direction of the flow of aqueous fluid.
  • the invention can be employed for the intended precipitation of salts.
  • many other applications can be thought which involve pH sensitive processes, and in which the temporary increase in pH is required or desirable. Therefore, in a further aspect the invention is directed to a method for treating an aqueous fluid comprising one or more electrolytes, said method comprising:
  • the anode compartment and the cathode compartment of the electrochemical cell are separated by an ion permeable separator, and wherein the aqueous fluid feed has a pH in the range of 4-13, preferably in the range of 5-12 or 6-10, more preferably in the range of 7-9, when entering the cathode compartment, and
  • said treatment comprises one or more selected from the group consisting of osmosis, reverse osmosis, membrane distillation, electrodialysis, heating, evaporation, boiling, distillation, advanced distillation, absorption, stripping, extraction, pumping, leaching, washing, dissolution, chemical stabilisation or destabilisation, adsorption, ion exchange, drying,
  • the pH of an aqueous fluid feed is temporarily increased using a cathode compartment of an electrochemical cell, in order to prepare the aqueous fluid for a specific treatment, such as the deliberate deposition or crystallisation of salts.
  • the pH of the treated aqueous fluid is lowered using an anode compartment of the same electrochemical cell.
  • the anode compartment and the cathode compartment are separated by an ion permeable separator.
  • the treatment can for instance generate one or more streams of treated aqueous fluid of which at least one stream is a stream of treated alkaline aqueous fluid.
  • FIG. 4 This aspect of the invention is exemplified by the schematic picture in Figure 4.
  • an aqueous fluid feed to be treated 21 is supplied into a cathode compartment 22.
  • Alkaline aqueous fluid to be treated 23 exits the cathode compartment 22 and is subjected to a treatment 24.
  • treated alkaline aqueous fluid 25 is introduced into anode compartment 26.
  • treated aqueous fluid 27 having a pH lower than the treated alkaline aqueous fluid 25 exits the anode compartment 26.
  • Anode compartment 26 and cathode compartment 22 are separated by ion permeable separator 28.
  • the aqueous fluid feed when entering the cathode compartment of the electrochemical cell, has a pH in the range of 4-13, such as in the range of 5-12 or 6-10, preferably in the range of 7-9.
  • substantially no treated alkaline aqueous fluid enters the cathode compartment of the electrochemical cell. In an embodiment, this is 5 wt.% or less of the produced treated alkaline aqueous fluid, more preferably 2 wt.% or less, even more preferably 1 wt.% or less.
  • substantially the entire aqueous fluid feed is supplied into the cathode. In an embodiment, this is 95 wt.% or more of the aqueous fluid feed, preferably 98 wt.% or more, even more preferably 99 wt.% or more.
  • the aqueous fluid is alkalised, i.e. the pH value of the aqueous fluid is increased.
  • the alkaline aqueous fluid to be treated that exits the cathode compartment can suitably have a pH value in the range of 4-14, such as 6-14, preferably 7-14 or 10-14, such as in the range of 10-12. At such high pH value the solubility of salts is much lower. This may cause precipitation of salts, which can be utilised in the treatment to be employed in combination with this aspect of the invention ⁇ e.g. crystallisation in a crystalliser).
  • the treatment generates at least treated alkaline aqueous fluid.
  • This can, for instance, be a product stream of treated alkaline aqueous fluid.
  • At least part of the treated alkaline aqueous fluid is fed into an anode compartment of the electrochemical cell.
  • water is oxidised by the positively charged anode to oxygen, protons, and electrons according to equation (1) above.
  • the aqueous fluid is acidified, i.e. the pH value of the aqueous fluid is decreased.
  • the pH is decreased to the same value as the pH of the aqueous fluid feed to be treated.
  • the treated aqueous fluid that exits the anode compartment can suitably have a pH value in the range of 4-13, such as in the range of 5-12 or 6-10 or 7-10, preferably in the range of 7-9.
  • carbon dioxide generated in the anode compartment (for instance according to equation (2) above) is removed from the anode compartment and introduced into the cathode compartment, for instance, in order to further promote precipitation of salts.
  • This can for instance be done by maintaining the electrochemical cell at underpressure, or by flushing the electrochemical cell for example with a nitrogen flow.
  • carbon dioxide from another source can be fed to the cathode compartment in order to promote precipitation of salts.
  • Collected carbon dioxide from the anode compartment can further be utilised in the treatment instead of in the cathode compartment to promote precipitation of salts. Precipitation inside the cathode compartment is in that case limited.
  • Example 1 In a setup as shown in Figure 1 (wherein the water treatment was a heating step using a heating spiral with a temperature of 90 °C), the decrease in pH of drinking water was measured, as a function of the charge supplied to the electrochemical cell.
  • Figure 5 shows the decrease in pH that is achieved in the anode compartment.

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

Abstract

L'invention concerne des procédés de traitement d'un fluide aqueux comportant un ou plusieurs électrolytes. Selon un des procédés de l'invention, une charge de fluide aqueux alimente un compartiment d'anode d'une pile électrochimique, où un fluide aqueux acide est généré. Ledit fluide aqueux acide est soumis à un traitement, après quoi le fluide aqueux acide traité est introduit dans un compartiment de cathode de la pile électrochimique, où un fluide aqueux traité présentant un pH supérieur à celui du fluide aqueux acide traité est généré. Les compartiments d'anode et de cathode sont séparés par une cloison perméable aux ions, et la charge présente un pH situé dans la plage de 4 à 12 lorsqu'elle entre dans le compartiment d'anode. L'invention concerne un autre procédé selon lequel une charge de fluide aqueux alimente un compartiment d'anode d'une pile électrochimique, où un fluide aqueux acide à traiter est généré. Ledit fluide aqueux acide est introduit dans un compartiment de cathode de la pile électrochimique, où est généré un fluide aqueux à traiter présentant un pH supérieur à celui du fluide aqueux acide à traiter. Le fluide aqueux généré dans le compartiment de cathode est soumis à un traitement. Les compartiments d'anode et de cathode sont séparés par une cloison perméable aux ions. L'invention concerne un autre procédé selon lequel une charge de fluide aqueux alimente un compartiment de cathode d'une pile électrochimique, où est généré un fluide aqueux alcalin à traiter. Ledit fluide aqueux alcalin est soumis à un traitement, après quoi le fluide aqueux alcalin traité est introduit dans un compartiment d'anode de la pile électrochimique, où est généré un fluide aqueux traité présentant un pH inférieur à celui du fluide aqueux alcalin traité. Les compartiments d'anode et de cathode sont séparés par une cloison perméable aux ions, et la charge de fluide aqueux présente un pH situé dans la plage de 4 à 13 lorsqu'elle entre dans le compartiment de cathode.
EP11703270A 2010-01-20 2011-01-19 Procédé de traitement d'un fluide aqueux Withdrawn EP2526066A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11703270A EP2526066A1 (fr) 2010-01-20 2011-01-19 Procédé de traitement d'un fluide aqueux

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP10151204A EP2348000A1 (fr) 2010-01-20 2010-01-20 Procédé de traitement d'un liquide aqueux
PCT/NL2011/050031 WO2011090376A1 (fr) 2010-01-20 2011-01-19 Procédé de traitement d'un fluide aqueux
EP11703270A EP2526066A1 (fr) 2010-01-20 2011-01-19 Procédé de traitement d'un fluide aqueux

Publications (1)

Publication Number Publication Date
EP2526066A1 true EP2526066A1 (fr) 2012-11-28

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