JP2011203025A - DEVICE AND METHOD FOR WASHING pH METER - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple low-cost pH meter washing device of high reliability and a pH meter washing method.SOLUTION: The washing device of the pH meter, which is provided in the pH measuring tank branched from waste solution treatment equipment, includes a pH meter washing tank, an on-off type bottom lid for taking out a washing solution to the base of the pH meter washing tank and a washing solution recovery tank for recovering the washing solution and characterized by providing a pH meter insertion port, a drain port for discharging the washing solution and the drain pipe connected to the drain port to the base of the washing solution recovery tank.

Description

  The present invention relates to a pH meter cleaning device and a pH meter cleaning method.

  In wastewater treatment facilities that collectively neutralize waste liquid discharged from various factories, etc., constantly measure the pH value of the wastewater flowing into the reaction tank, so that the pH value of the reaction tank approaches the target value, Neutralization treatment is performed by increasing / decreasing the injection amount of the neutralizing agent, and the wastewater treated in the control pH value range is discharged as treated water.

  Usually, pH measurement is performed in a pH measurement tank in which a part of the waste liquid flowing into the wastewater treatment facility is branched. Since new waste liquid flows into and out of the pH measurement tank one after another, pH measurement is performed continuously. Therefore, if sludge or the like in the waste liquid adheres to the surface of the measurement electrode with time, accurate pH measurement becomes difficult. Therefore, it is necessary to periodically clean the surface of the measurement electrode of the pH meter manually or automatically to try to prevent the abnormality of the pH indication value.

  Conventionally, as shown in FIGS. 4 to 6, the pH meter is washed by immersing the pH meter in a pH measuring tank into which a part of the waste liquid flowing into the wastewater treatment facility is branched (FIG. 4). When the pH measurement electrode is contaminated, the pH meter is pulled up into the pH meter cleaning tank, and the chemical solution is injected into the pH meter cleaning tank with a pump or the like to clean the electrode portion of the pH meter (FIG. 5). The chemical solution used for cleaning (pH meter cleaning solution) was directly discharged into the pH measurement tank (FIG. 6).

  Regarding the cleaning of the pH meter, Patent Document 1 discloses a pH measuring device that automatically cleans and calibrates the pH meter.

Japanese Patent Laid-Open No. 5-164736

  In the conventional technology, if the chemical solution used for cleaning the pH meter (pH meter cleaning solution) is discharged to the pH measurement tank as it is, the effect on the pH measurement value is large, and depending on the flow rate of the pH measurement object, it takes a significant amount of time to disappear. May be required. Further, when the pH meter cleaning liquid is discharged into the pH measurement tank as it is, there is a problem that the chemical liquid is scattered around the pH measurement tank.

  On the other hand, by attaching the cleaning liquid recovery device described in Patent Document 1, the influence on the pH measurement value can be suppressed, but there is a problem that the equipment cost of the device becomes high.

  An object of the present invention is to provide a pH meter cleaning device and a pH meter cleaning method that are simple and inexpensive and have high reliability.

  The inventor diligently studied the configuration of the pH meter cleaning device in order to solve the above-described problems, and reached the present invention.

  A first invention is a pH meter cleaning device attached to a pH measurement tank branched from a waste liquid treatment facility, a pH meter cleaning tank, and an openable bottom lid for taking out the cleaning liquid at the bottom of the pH meter cleaning tank, A pH meter, comprising: a cleaning liquid recovery tank for recovering the cleaning liquid; a pH meter insertion port at the bottom of the cleaning liquid recovery tank; a drain port for discharging the cleaning liquid; and a drain pipe connected to the drain port. It is a cleaning device.

  The second aspect of the present invention is the pH meter cleaning device according to the first aspect, further comprising a valve for preventing leakage of cleaning liquid at the pH meter insertion port, and a drain valve attached to the drain pipe. It is.

  The third aspect of the present invention is to inject a cleaning liquid from a cleaning liquid inlet provided in the pH meter cleaning tank and wash the pH meter, then open a bottom lid provided at the bottom of the pH meter cleaning tank and collect the cleaning liquid. A pH meter cleaning method characterized by discharging the cleaning liquid stored in the cleaning liquid recovery tank out of the system from a drain pipe connected to a drain port of the cleaning liquid recovery tank after discharging to the tank at least once. It is.

  By using the present invention, it is possible to manufacture a pH meter cleaning device at a low cost and to reliably collect the cleaning liquid, and since the cleaning liquid is not discharged to the pH measuring tank, the waste liquid pH in the pH measuring tank by the cleaning liquid can be reduced. There is no change.

It is a figure explaining the pH meter washing | cleaning apparatus of this invention. It is a figure explaining the washing | cleaning method of the pH meter of this invention. It is a figure explaining the washing | cleaning-liquid collection | recovery tank of this invention. It is a figure explaining the conventional pH meter washing | cleaning apparatus. It is a figure explaining the washing | cleaning method of the conventional pH meter. It is a figure explaining the conventional washing | cleaning liquid discharge | emission method.

  The present invention will be described with reference to the drawings.

  FIG. 1 is a diagram illustrating a pH meter cleaning device according to the present invention. The pH meter cleaning device includes a pH meter cleaning tank 2 that periodically cleans the pH meter 1 and a cleaning liquid recovery tank 5 that is connected to the bottom of the pH meter cleaning tank 2, and pH measurement waste liquid flows in and out. It is installed in the upper part of the pH measurement tank 13. A cleaning liquid injection port 3 is provided in the pH meter cleaning tank 2, and a chemical solution 4 (pH meter cleaning solution) for cleaning the pH meter 1 is injected from the cleaning liquid injection port 3.

  The cleaning liquid recovery tank 5 has a cubic or cylindrical shape having a capacity for temporarily storing the chemical solution or the like that has cleaned the pH meter 1, and a bottom lid 6 that can open and close the bottom of the pH meter cleaning tank 2 at the top. Is attached. A drain port 7 and a pH meter insertion port 10 are attached to the bottom of the cleaning liquid recovery tank 5.

  Since a drain pipe is connected to the drain port 7 and the pH meter cleaning liquid 4 can be discharged out of the system from the drain pipe 8, the pH measuring tank 13 is not contaminated by the pH cleaning liquid 4. Furthermore, if a drain valve is attached to the drain pipe 8, it is more preferable because the discharge of the stored pH meter cleaning liquid 4 to the outside of the system can be controlled.

  A valve 9 made of rubber or the like may be attached to the pH meter insertion port 10 in order to prevent the pH meter cleaning liquid 4 from leaking from the gap between the pH meter 1 and the pH meter insertion port 10.

  A waste liquid inlet 11 and a waste liquid outlet 12 are attached to the pH measurement tank 13 to receive and discharge the waste liquid. The upper part of the pH measurement tank 13 is preferably sealed with an upper lid provided with a pH meter insertion port 15 and a waste liquid inlet 11. This is to prevent the pH measurement value from fluctuating due to the pH meter cleaning liquid 4 flowing into the pH measurement tank 13.

  Next, the operation of the present invention will be described.

  When measuring the pH of the waste liquid 14 flowing into the pH measuring tank 13, the bottom lid 6 at the bottom of the pH meter cleaning tank 2 is opened and the pH meter 1 is inserted from the top of the pH meter cleaning tank 2, and the cleaning liquid recovery tank 5 is passed through a pH meter insertion port 10 provided at the bottom of 5 and a pH meter insertion port 15 at the top of the pH measurement tank 13 and immersed in the waste liquid 14 to perform pH measurement (FIG. 1).

  When the pH meter 1 is contaminated, or after periodically lifting the pH meter 1 from the waste liquid 14 and closing the bottom cover 6 at the bottom of the pH meter cleaning tank 2, the pH meter cleaning liquid 4 is removed from the cleaning liquid inlet 3. The pH meter 1 is washed by being injected into the washing tank 2 (FIG. 2). Each time cleaning is performed, the bottom lid 6 is opened and the pH meter cleaning solution 4 is discharged to the cleaning solution recovery tank 5 at least once, and then the pH meter cleaning solution 4 stored in the cleaning solution recovery tank 5 is removed from the drain pipe. (Fig. 3). Then, after the cleaning process of the pH meter 1 is completed, the pH meter 1 is immersed in the waste liquid 14 to restart pH measurement (FIG. 1).

  The type of pH meter cleaning solution 4 and the number of times of cleaning may be appropriately determined according to the degree of contamination of the pH meter 1. Alternatively, the pH meter cleaning liquid 4 adhered to the surface of the pH meter 1 may be washed away by cleaning with purified water after the pH meter cleaning solution 4 is cleaned.

1 pH meter 2 pH meter cleaning tank 3 pH meter cleaning liquid inlet 4 pH meter cleaning liquid 5 Cleaning liquid recovery tank 6 Bottom lid 7 Drain port 8 Drain pipe 9 Valve 10 pH meter insertion port 11 Waste liquid inlet 12 Waste liquid outlet 13 pH measuring tank 14 Waste 15 pH meter insertion port

Claims (3)

  A pH meter cleaning device attached to a pH measurement tank branched from a waste liquid treatment facility, a pH meter cleaning tank, an openable bottom lid for taking out the cleaning liquid at the bottom of the pH meter cleaning tank, and a cleaning liquid for collecting the cleaning liquid A pH meter cleaning apparatus comprising: a recovery tank; and a pH meter insertion port, a drain port for discharging the cleaning liquid, and a drain pipe connected to the drain port at the bottom of the cleaning liquid recovery tank.   2. The pH meter cleaning apparatus according to claim 1, further comprising a valve for preventing leakage of cleaning liquid at the pH meter insertion port, and a drain valve attached to the drain pipe.   After cleaning the pH meter by injecting the cleaning solution from the cleaning solution inlet provided in the pH meter cleaning tank, the bottom lid provided at the bottom of the pH meter cleaning tank is opened and the cleaning liquid is discharged to the cleaning liquid recovery tank. A cleaning method for a pH meter, which is performed at least once or more, and then drains the cleaning liquid stored in the cleaning liquid recovery tank out of the system from a drain pipe connected to a drain port of the cleaning liquid recovery tank.

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