Electrolytic ozone water production method and device therefor and solid polymer electrolyte membrane regenerating method

A method for producing water containing ozone by electrolysis, wherein

• an anodic electrode is disposed on one side of a solid polymer electrolyte membrane, which is provided with a catalyst function for generating ozone,
• a cathode electrode is disposed on other side of the solid polymer electrolyte membrane,
• DC voltage is applied between the both electrodes in a condition that the both electrodes are in contact with the solid polymer electrolyte membrane,
• water flows on both sides of the solid polymer electrolyte membrane,
• water containing ozone is produced at the anodic electrode side by electrolysis of the flowing water,
• a current value of the direct-current power source or a voltage value changes rapidly according to a preset condition, after that, returns to an original value or the vicinity of it, thereby
• a recovery treatment of the solid polymer electrolyte membrane is carried out by the above operation for changing the electric current or the voltage while continuing the production of the water containing ozone.

An apparatus for producing water containing ozone by electrolysis, wherein,

• an anodic electrode having a catalyst function for generating ozone is disposed on one side of solid polymer electrolyte membrane,
• a cathode electrode is disposed on other side of solid polymer electrolyte membrane,
• an advance and reverse mechanism is arranged which enables the both electrodes or at least one of them to advance and reverse against the solid polymer electrolyte membrane,
• DC voltage is applied between the both electrodes in the state that the both electrodes is pressed to the solid polymer electrolyte membrane,
• water flows on the both sides of the solid polymer electrolyte membrane, then
• water containing ozone is produced at the anodic electrode side by electrolysis of the flowing water, and
• further comprising,
• a setting device for setting an initial value of the pressing force of the both electrodes as against the solid polymer electrolyte membrane,
• a concentration detection sensor for detecting a concentration of produced water containing ozone,
• a first comparator for comparing the concentration detected by a concentration detection sensor with a preset predetermined value,
• a first command device for setting the current value supplied between the both electrodes according to a comparison signal from the first comparator so that the concentration gets closer to a predetermined value,
• a second command device by which the pressing force of the both electrodes against the solid polymer electrolyte membrane changes into a preset value to detect that an elapsed time reaches a preset predetermined value during run or that the concentration reaches a preset control start concentration, and the pressing force returns to an initial value after a predetermined time elapses.

An apparatus for producing water containing ozone by electrolysis, wherein

• an anodic electrode having a catalyst function for generating ozone is disposed on one side of solid polymer electrolyte membrane,
• a cathode electrode is disposed on other side of solid polymer electrolyte membrane,
• an advance and reverse mechanism is arranged which enables the both electrodes or at least one of them to advance and reverse against the solid polymer electrolyte membrane,
• DC voltage is applied between the both electrodes in the state that the both electrodes is pressed onto the solid polymer electrolyte membrane,
• water flows on the both sides of the solid polymer electrolyte membrane, then
• water containing ozone is produced at the anodic electrode side by electrolysis of the flowing water, and
• further comprising,
• a setting device for setting an initial value of the pressing force of the both electrodes as against the solid polymer electrolyte membrane,
• a concentration detection sensor for detecting a concentration of produced water containing ozone,
• a first comparator for comparing the concentration detected by a concentration detection sensor with a preset predetermined value,
• a first command device for setting the current value supplied between the both electrodes according to a comparison signal from the first comparator so that the concentration gets closer to a predetermined value,
• a second command device by which the pressing force of the both electrodes against the solid polymer electrolyte membrane changes into a preset value to detect that an elapsed time reaches a preset predetermined value during run or that the concentration reaches a preset control start concentration, and the pressing force returns to an initial value after a predetermined time elapses,
• a second comparator for determining that the current value reaches a predetermined ceiling value of the apparatus,
• a third command device by which the running apparatus is stopped when the second comparator detects that the current value reaches a predetermined ceiling value and when it is detected the concentration reaches a predetermined lower limit value, and the pressing force of the both electrodes or one of them against the solid polymer electrolyte membrane is released, then, the apparatus works again after a predetermined time elapses.

A recovery method of a solid polymer electrolyte membrane, using an apparatus for producing water containing ozone by electrolysis in which

• an anodic electrode having a catalyst function for generating ozone is disposed on one side of solid polymer electrolyte membrane,
• a cathode electrode is disposed on other side of solid polymer electrolyte membrane,
• an advance and reverse mechanism is arranged, which enables the both electrodes or at least one of them to advance and reverse against the solid polymer electrolyte membrane,
• DC voltage is applied between the both electrodes in the state that the both electrodes are pressed to the solid polymer electrolyte membrane,
• water flows on the both sides of the solid polymer electrolyte membrane, then
• water containing ozone is produced at the anodic electrode side by electrolysis of the flowing water, and
• in order to recover an efficiency of the solid polymer electrolyte membrane of which efficiency has deteriorated during producing the water containing ozone, an operation for changing the pressing force is carried out wherein,
• the pressing force of the anodic electrode, the cathode electrode or the both of them against the solid polymer electrolyte membrane changes in accordance with a preset condition, after that, returns to an original pressing force, thereby the efficiency of the solid polymer electrolyte membrane is restored.

A recovery method of a solid polymer electrolyte membrane, using an apparatus for producing water containing ozone by electrolysis in which

• an anodic electrode having a catalyst function for generating ozone is disposed on one side of solid polymer electrolyte membrane,
• a cathode electrode is disposed on other side of solid polymer electrolyte membrane,
• an advance and reverse mechanism is arranged which enables the both electrodes or at least one of them to advance and reverse against the solid polymer electrolyte membrane,
• DC voltage is applied between the both electrodes in the state that the both electrodes is pressed onto the solid polymer electrolyte membrane,
• water flows on the both sides of the solid polymer electrolyte membrane, then
• water containing ozone is produced at the anodic electrode side by electrolysis of the flowing water, and
• in order to recover an efficiency of the solid polymer electrolyte membrane of which efficiency has deteriorated during producing the water containing ozone, an operation for changing the electric current or voltage is carried out wherein,
• the current value or the voltage value changes rapidly according to a preset condition, after that, returns to an original value or the vicinity of it, thereby, an efficiency of the solid polymer electrolyte membrane recovers.