JP6535532B2 - Method of regenerating ion exchange resin - Google Patents

Description

  The present invention relates to a method of regenerating an ion exchange resin, and more specifically, a method of regenerating an ion exchange resin in which a regeneration solution is supplied to a regeneration processing tank containing an ion exchange resin having a reduced ion exchange capacity. About.

  Conventionally, an ion exchange resin is used to separate the ions contained in the solution, but this ion exchange resin loses its ion exchange capacity when a certain amount of ion exchange is carried out. Regeneration is performed by immersing in a regeneration solution containing exchange ions. As a method for regenerating this ion exchange resin, the regenerating solution is supplied from the regenerating solution tank containing the regenerating solution to the regenerating treatment tank containing the ion exchange resin having a reduced ion exchange capacity through the regenerating solution supply path, There has been one in which the regenerating solution which has passed through the ion exchange resin from the outlet of the tank through the waste liquid passage is sent to the waste liquid tank (see, for example, Patent Document 1).

JP-A-7-270214

  However, in the thing of the above-mentioned patent document 1, when reproduction | regeneration of ion exchange resin was complete | finished, the reproduction | regeneration liquid which remained in the reproduction | regeneration processing tank was sent to the waste-liquid tank via the waste-liquid path, and was wasted wastefully.

  Therefore, the present invention aims to provide a regeneration method of ion exchange resin that can return the regeneration solution remaining in the regeneration processing tank to the regeneration solution tank and eliminate waste when regeneration of ion exchange resin is completed. There is.

In order to achieve the above object, according to the ion exchange resin regeneration method of the present invention, an ion exchange resin is supplied to a regeneration treatment tank containing an ion exchange resin with reduced ion exchange capacity to regenerate the ion exchange resin. In the resin regeneration method, the ion exchange resin with reduced ion exchange capacity is accommodated in the regeneration treatment tank to supply washing water, the ion exchange resin is washed with water, and the washing water after ion exchange resin washing is discharged. A first washing step; and a regeneration step of supplying the regeneration solution from the regeneration solution tank to the regeneration treatment tank after the first rinsing step, and regenerating the ion exchange resin; and regenerating the ion exchange resin. The state of the regenerating solution discharged in the regenerating solution discharging step of discharging the solution and the regenerating solution discharging step is monitored by a sensor to detect that the regeneration of the ion exchange resin is completed. When, playback stops the discharge of the regenerant, returning the regenerated liquid remaining in the regeneration process tank to the regenerant tank via a regenerant return path provided in the intermediate portion of the regeneration process tank After the completion of the liquid return step and the regenerated liquid return step, washing water is supplied to the regeneration treatment tank, the ion exchange resin is washed with water, and then the ion exchange resin is washed with water. And a process.

  According to the method for regenerating an ion exchange resin of the present invention, when the state of the regenerating solution discharged in the regenerating solution discharging step is monitored by a sensor and it is detected that the regeneration of the ion exchange resin is completed, By stopping the discharge and providing the regenerating solution return step of returning the regenerating solution remaining in the regenerating processing tank to the regenerating solution tank through the regenerating solution return path, the regenerating solution is effectively used without wasting it. The cost can be reduced.

It is a systematic diagram of the ion exchange resin regeneration device which shows one embodiment of the present invention. It is explanatory drawing of the ion exchange resin reproduction | regeneration apparatus which supplies the wash water to the reproduction | regeneration processing tank by a 1st water washing process. It is explanatory drawing of the ion exchange resin reproduction | regeneration apparatus which is discharging | emitting wash water from the reproduction | regeneration processing tank by the 1st water washing process. It is explanatory drawing of the ion exchange resin reproduction | regeneration apparatus which supplies the reproduction | regeneration liquid to the reproduction | regeneration processing tank at the reproduction | regeneration process. It is explanatory drawing of the ion exchange resin reproduction | regeneration apparatus which is discharging | emitting the reproduction | regeneration liquid from the reproduction | regeneration processing tank at the reproduction | regeneration process. It is explanatory drawing of the ion exchange resin reproduction | regeneration apparatus which has returned the reproduction | regeneration liquid from the reproduction | regeneration processing tank to the reproduction | regeneration liquid tank by the reproduction | regeneration liquid return process. It is explanatory drawing of the ion exchange resin reproduction | regeneration apparatus which supplies the wash water to the reproduction | regeneration processing tank by a 2nd water washing process. It is explanatory drawing of the ion exchange resin reproduction | regeneration apparatus which has discharged | emitted the wash water from the reproduction | regeneration processing tank by the 2nd water washing process.

  FIG. 1 shows an embodiment of the ion exchange resin regeneration apparatus 11, which includes a regeneration treatment tank 13 containing an ion exchange resin 12 having a reduced ion exchange capacity, a regeneration solution tank 14 storing a regeneration solution, and washing. A water supply tank 15 for storing water, a waste liquid tank 16 for storing waste liquid from the regeneration processing tank 13, and a sensor 17 for monitoring the state of waste liquid from the regeneration processing tank 13 are provided.

  The regeneration treatment tank 13 is provided with an introduction path 13 a for introducing the ion exchange resin 12 and a lead-out path 13 b for leading the ion exchange resin 1. A water supply passage 18 is provided between the regeneration processing tank 13 and the water supply tank 15, and a water supply valve 19 is provided in the water supply passage 18. A drainage path 20 is provided between the regeneration processing tank 13 and the waste liquid tank 16, and the sensor 17 is provided on the regeneration processing tank 13 side of the drainage path 20, and an outlet valve downstream of the sensor 17 21, a withdrawal pump 22 and a waste liquid discharge valve 23 are provided in order. Between the lower portion of the regenerating solution tank 14 and the upper portion of the regenerating treatment tank 13, a regenerating solution supply path 24 for supplying the regenerating solution is provided. However, the regeneration solution injection valve 26 is provided on the regeneration processing tank 13 side, and the regeneration solution pump 27 is disposed between the supply valve 25 and the regeneration solution injection valve 26. Further, a regeneration liquid return path 28 for returning the regeneration liquid from the regeneration processing tank 13 to the regeneration liquid tank 14 is provided between the upper portion of the regeneration liquid tank 14 and the middle portion of the regeneration processing tank 13. The surplus regeneration liquid discharge valve 29 is provided on the regeneration processing tank 13 side, and the regeneration liquid return valve 30 is provided on the regeneration liquid tank 14 side, and between the surplus regeneration liquid discharge valve 29 and the regeneration liquid return valve 30 A regenerating fluid pump 27 is disposed. In addition, common pipes are used in part for the regeneration liquid supply path 24 and the regeneration liquid return path 28.

  When the ion exchange resin 12 whose ion exchange capacity has been reduced is regenerated by the ion exchange resin regeneration apparatus 11 described above, the ion exchange resin 12 whose ion exchange capacity has decreased is introduced into the regeneration treatment tank 13 via the introduction path 13a. After that, first, the first water washing step is performed. In the first washing step, as shown in FIG. 2, after the water supply valve 19 is opened and washing water is supplied from the water supply tank 15 to the regeneration processing tank 13 via the water supply path 18, as shown in FIG. The water supply valve 19 is closed, the outlet valve 21 and the waste liquid discharge valve 23 are opened, the drawing pump 22 is operated, and the waste water having the ion exchange resin 12 washed is sent to the waste liquid tank 16 via the drainage passage 20.

  After the completion of the first washing step, the regeneration step is performed. In the regeneration step, as shown in FIG. 4, the drawing pump 22 is stopped and the outlet valve 21 and the waste solution discharge valve 23 are closed, the supply valve 25 and the regeneration solution injection valve 26 are opened, and the regeneration solution pump 27 is operated. Then, the regeneration solution is sent to the regeneration processing tank 13 through the regeneration solution supply path 24 to regenerate the ion exchange resin 12.

  Next, as shown in FIG. 5, a regeneration solution discharging step is performed. In the regenerating solution discharging step, the regenerating solution pump 27 is stopped, the supply valve 25 and the regenerating solution inlet valve 26 are closed, the outlet valve 21 and the waste solution discharging valve 23 are opened, the drawing pump 22 is operated, and the drainage path 20 The regenerated solution that has passed through the ion exchange resin 12 is sent to the waste liquid tank 16 via the

  The regeneration solution that has passed through the ion exchange resin 12 discharged from the regeneration treatment tank 13 is monitored by the sensor 17 provided in the drainage path 20, and when it is detected that regeneration of the ion exchange resin 12 is completed, regeneration is performed. A liquid return step is performed. In the regenerating solution returning step, as shown in FIG. 6, the drawing pump 22 is stopped, the outlet valve 21 and the waste solution discharging valve 23 are closed, and the excess regenerating solution discharging valve 29 and the regenerating solution return valve 30 are opened. The liquid pump 27 is operated to return the regenerated liquid remaining in the regeneration processing tank 13 to the regenerated liquid tank 14 via the regenerated liquid return path 28.

  After completion of the regenerating solution returning step, the second water washing step is performed. In the second washing step, as shown in FIG. 7, the regeneration solution pump 27 is stopped, the surplus regeneration solution discharge valve 29 and the regeneration solution return valve 30 are closed, and the water supply valve 19 is After the cleaning water is supplied from the open water supply tank 15 to the regeneration processing tank 13 through the water supply path 18, as shown in FIG. 8, the water supply valve 19 is closed, the outlet valve 21 and the waste liquid discharge valve 23 are opened, The pump 22 is operated to drain the ion exchange resin 12 washed through the drainage passage 20 to the drainage tank 16, and the regenerated ion exchange resin 12 is led out through the lead passage 13b.

  In this embodiment, as described above, the state of the regeneration solution having passed through the ion exchange resin 12 is monitored by the sensor 17 provided in the drainage path 20, and it is detected that the regeneration of the ion exchange resin 12 is completed. The waste fluid path 20 is shut off, and the regenerating fluid returning step for returning the regenerating fluid remaining in the regenerating treatment tank 13 to the regenerating fluid tank 14 via the regenerating fluid return route 28 wastes the regenerating fluid. It can be used effectively without doing so, and the cost can be reduced.

  The ion exchange resin of the present invention is not limited, and the regeneration solution and the sensor may be appropriately selected according to the ion exchange resin. Furthermore, if there is a difference in height between the regeneration processing tank and the regeneration solution tank, the regeneration solution pump can be omitted.

11: Ion exchange resin generator, 12: Ion exchange resin, 13: Regeneration treatment tank, 13a: Introduction path, 13b: Derivation route, 14: Regeneration solution tank, 15: Water supply tank, 16: Waste tank, 17: Sensor, 18 ... water supply path, 19 ... water supply valve, 20 ... drainage path, 21 ... outlet valve, 22 ... withdrawal pump, 23 ... waste liquid discharge valve, 24 ... regeneration liquid supply path, 25 ... supply valve, 26 ... regeneration liquid injection valve, 27: Regeneration fluid pump, 28: Regeneration fluid return path, 29: Excess regeneration fluid discharge valve, 30: Regeneration fluid return valve

Claims (1)

In a regeneration method of an ion exchange resin, a regeneration solution is supplied to a regeneration treatment tank containing an ion exchange resin having a reduced ion exchange capacity to regenerate the ion exchange resin,
A first washing step of storing the ion exchange resin having reduced ion exchange capacity in the regeneration treatment tank to supply washing water, washing the ion exchange resin with water, and discharging washing water after washing of the ion exchange resin;
After the completion of the first washing step, a regeneration step of supplying the regeneration solution from the regeneration solution tank to the regeneration treatment tank to regenerate the ion exchange resin;
A regenerating solution discharging step of discharging the regenerating solution after regenerating the ion exchange resin;
The state of the regenerating solution discharged in the regenerating solution discharging step is monitored by a sensor, and when it is detected that the regeneration of the ion exchange resin is completed, the discharging of the regenerating solution is stopped, and A regenerating solution returning step of returning the regenerating solution remaining in the regenerating solution tank to the regenerating solution tank through a regenerating solution return path provided in an intermediate portion of the regenerating treatment tank ;
After the completion of the regenerating solution returning step, the method further comprises the steps of: supplying washing water to the regeneration treatment tank, washing the ion exchange resin with water, and discharging the washing water after washing the ion exchange resin. A method of regenerating an ion exchange resin characterized by

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