JP5171586B2 - UV measuring device - Google Patents

Description

  The present invention relates to a UV measuring apparatus for measuring the content of organic pollutants installed in a wastewater treatment apparatus.

  The measurement of chemical oxygen demand (COD), which represents the degree of water pollution, is based on the manual analysis method according to JIS K 0102 “Industrial Wastewater Test Method”. In the primary water quality regulation regarding water quality, automatic measuring instruments correlated with the manual analysis method may be used.

  In the measurement of COD, a UV measuring device, which is a measuring device for measuring organic pollution, which is one of water pollution, has been developed by applying ultraviolet absorption having a good correlation. UV measuring devices are widely used in public rivers, factory effluents and the like as automatic measuring instruments for COD measurement.

For example, in Patent Document 1, even if dissolved ozone is present in ozone-treated water, the ultraviolet absorbance derived from the absorption of organic substances can be accurately and continuously performed by performing a simple pretreatment or adding another measuring device. And methods for measuring UV absorbance for processes that can be measured automatically.
JP-A-8-304383

  In the method and apparatus for measuring ultraviolet absorbance of Patent Document 1, even when dissolved ozone is present, ultraviolet absorbance (hereinafter referred to as UV) derived from absorption of organic substances can be measured accurately and continuously. However, it cannot cope with a situation in which the index of UV suddenly changes due to air bubbles contained in the water sample collected in the gap between the light emitting unit and the light receiving unit of the UV meter sensor unit.

  The present invention has been made in view of the above problems, and it is possible to measure UV accurately and continuously by making it difficult for air bubbles contained in water to collect in the gap between the light emitting part and the light receiving part of the UV meter sensor part. An object of the present invention is to provide a UV measuring apparatus that can be used.

(1) The present invention includes a defoaming tank equipped with a defoaming means for removing bubbles contained in sample water, and an organic contaminant contained in the defoamed sample water from which bubbles are removed in the defoaming tank. A measuring unit for measuring the amount of the organic pollutant, the measuring unit for storing the defoamed sample water to measure the content of the organic pollutant, and the organic pollutant of the defoamed sample water A UV meter sensor unit for measuring a content, and a UV meter sensor unit comprising a light emitting unit for emitting light to the defoamed sample water and a light receiving unit for receiving the light on a bottom surface of the UV meter sensor unit; A UV meter display unit that displays the content of the organic pollutant contained in the defoamed sample water sensed by the meter sensor unit, and the bottom surface of the UV meter sensor unit is a predetermined amount relative to the bottom surface of the measurement tank. was placed in the measurement vessel to have a tilt, the measuring tank is further the de to the measuring tank The defoamed sample water flowing in from the inflow port does not directly hit the UV meter sensor unit between the inflow port provided in the measurement tank into which the sample water flows in, and the inflow port and the UV meter sensor unit. As described above, a rectifying plate for adjusting the flow of the defoamed sample water is provided .

According to the UV measurement apparatus of (1), since the bottom surface of the UV meter sensor unit has a predetermined inclination with respect to the bottom surface of the measurement tank, air bubbles contained in the defoamed sample water are separated from the light emitting unit. It is difficult to collect in the gap between the light receiving parts and moves upward. Therefore, the UV measuring apparatus can reduce the influence of measurement due to air bubbles by making it difficult to collect in the gap between the light emitting part and the light receiving part of the UV meter sensor part, and measures UV accurately and continuously. be able to.
In addition, since the UV measuring device includes a current plate, when the defoamed sample water flows into the measurement tank, the defoamed sample water tends to contain air bubbles, but the defoamed sample water contains many air bubbles. It is possible to prevent the foam sample water from directly hitting the UV meter sensor unit.

  (2) In the present invention, the measurement tank of the UV measurement apparatus according to (1) further includes a holding unit that holds the UV meter sensor unit on a bottom surface of the measurement tank, and the holding unit includes the UV meter. The UV meter sensor unit is held such that the bottom surface of the sensor unit has a predetermined inclination with respect to the bottom surface of the measurement tank.

  According to the UV measuring apparatus of (2), by having the holding portion on the bottom surface of the measurement tank, it is possible to easily keep the state in which the bottom surface of the UV sensor portion has a predetermined inclination with respect to the bottom surface of the measuring portion. Can do. Therefore, the UV measuring apparatus can reduce the influence of measurement due to air bubbles by making it difficult to collect in the gap between the light emitting part and the light receiving part of the UV meter sensor part, and measures UV accurately and continuously. be able to.

  (3) In the present invention, the UV meter sensor unit of the UV measuring device according to (1) further includes a fixing unit that fixes the bottom surface of the measurement tank to the bottom surface of the UV meter sensor unit, The UV meter sensor unit is fixed to the bottom surface of the measurement tank so that the bottom surface has a predetermined inclination with respect to the bottom surface of the measurement tank.

  According to the UV measuring apparatus of (3), by having the fixing unit on the bottom surface of the UV meter sensor unit, the state in which the bottom surface of the UV sensor unit has a predetermined inclination with respect to the bottom surface of the measuring unit can be easily and stably maintained. Can keep. Therefore, the UV measuring apparatus can reduce the influence of measurement due to air bubbles by making it difficult to collect in the gap between the light emitting part and the light receiving part of the UV meter sensor part, and measures UV accurately and continuously. be able to.

  (4) In the present invention, the predetermined inclination of the bottom surface of the UV meter sensor unit of the UV measurement device according to any one of (1) to (3) with respect to the bottom surface of the measurement tank is 10 degrees or more and 15 degrees or less. It is characterized by being within the range.

  According to the UV measurement device of (4), since the predetermined inclination of the bottom surface of the UV meter sensor unit with respect to the bottom surface of the measurement tank is 10 degrees or more and 15 degrees or less, the air contained in the defoamed sample water Air bubbles are very difficult to collect in the gap between the light emitting part and the light receiving part. Therefore, the air bubbles can be moved upward.

  According to the UV measuring apparatus of the present invention, the UV measuring apparatus is less likely to accumulate in the gap between the light emitting unit and the light receiving unit of the UV meter sensor unit, can reduce the influence of measurement due to air bubbles, and can accurately detect UV. And it can measure continuously.

  Hereinafter, a first embodiment of the present invention will be described. FIG. 1 is a schematic diagram of a UV measurement apparatus according to the first embodiment of the present invention. The UV measurement device 1 includes a defoaming tank 12 and a measurement unit 20. The defoaming tank 12 includes defoaming means 11. The measurement unit 20 includes a measurement tank 21, a UV meter sensor unit 22, and a UV meter display unit 27.

  The sample water is stored in the defoaming tank 12. The sample water is defoamed by removing the bubbles of air contained in the sample water by the defoaming means 11 provided in the defoaming tank 12. The defoamed sample water is then measured in the measurement unit 20 for the content of the organic pollutant contained in the defoamed sample water. Therefore, the defoamed sample water is sent to the measurement tank 21 of the measurement unit 20 after removing the bubbles.

  The measurement tank 21 includes an inlet 21a and an outlet 21b. The defoamed sample water is stored in the measurement tank 21 from the inlet 21 a provided in the measurement tank 21. In FIG. 1, the inlet 21 a is provided on the side surface of the measurement tank 21, but the inlet 21 a may be provided on the upper surface of the measurement tank 21. The defoamed sample water may contain air bubbles when stored in the measurement tank 21. Therefore, the defoamed sample water 26 stored in the measurement tank 21 contains air bubbles. The defoamed sample water 26 is discharged to the outside through the discharge port 21b. In FIG. 1, the discharge port 21 b is provided on the bottom surface of the measurement tank 21, but may be provided on the side surface of the measurement tank 21.

  The UV meter sensor unit 22 measures the content of the organic pollutant contained in the defoamed sample water 26. The UV meter sensor unit 22 has a flat bottom surface 22a. The bottom surface 22 a includes a light emitting unit 23 and a light receiving unit 24. The light emitting unit 23 emits light to the defoamed sample water 26 stored in the measurement tank 21. On the other hand, the light receiving unit 24 receives light that has passed through the defoamed sample water 26 from the light emitting unit 23. The UV measurement principle of the UV meter sensor unit 22 will be described later.

  The UV meter display unit 27 is connected to the UV meter sensor unit 22. The UV meter display unit 27 displays the content of the organic pollutant contained in the defoamed sample water 26 sensed by the UV meter sensor unit 22.

  When the bottom surface 22a of the UV meter sensor unit is positioned in parallel with the bottom surface 21c of the measurement tank, air bubbles contained in the defoamed sample water 26 are converted into the bottom surface 21c of the measurement tank, the light emitting unit 23, and the light receiving unit 24. It concentrates and accumulates in the space part 25 surrounded by. When air bubbles are concentrated and accumulated in the space portion 25, the air bubbles are between the light emitting portion 23 and the light receiving portion 24, so that the UV meter sensor portion 22 cannot perform accurate UV measurement. .

  In 1st embodiment of this invention, the bottom face 22a of a UV meter sensor part has a predetermined angle with respect to the bottom face 21c of a measurement tank. When the bottom surface 22a of the UV meter sensor section has a predetermined angle with respect to the bottom surface 21c of the measurement tank, air bubbles are unlikely to collect in the space section 25 and move to the water surface 26a of the defoamed sample water. Therefore, air bubbles are less likely to accumulate in the space 25, and the UV meter sensor unit 22 can perform accurate UV measurement.

  It is preferable that the predetermined inclination which the bottom face 22a of a UV meter sensor part has with respect to the bottom face 21c of a measurement tank exists in the range of 10 degree | times or more and 15 degrees or less. By having an inclination within the range, air bubbles contained in the defoamed sample water 26 are extremely difficult to accumulate in the space 25 and can be effectively moved to the water surface 26a of the defoamed sample water.

  Further, the measurement tank 21 may further include holding parts 31a and 31b for holding the UV meter sensor part 22 on the bottom surface 21c of the measurement tank. The heights of the holding portions 31a and 31b are different from each other. In FIG. 1, the height of the holding portion 31a is shown as being lower than the height of the holding portion 31b, but the height of the holding portion 31b may be lower than the height of the holding portion 31a. Since the heights of the holding portions 31a and 31b are different, the holding portions 31a and 31b hold the UV meter sensor unit 22 so that the bottom surface 22a of the UV meter sensor unit has a predetermined inclination with respect to the bottom surface 21c of the measurement tank. be able to.

  Further, the holding portions 31a and 31b may be completely integrated with the measurement tank 21 and cannot be detached from the bottom surface 21c of the measurement tank, or may be removable from the bottom surface 21c of the measurement tank. good. The holding portions 31a and 31b may further include a height adjusting means for adjusting the height of the holding portions 31a and 31b. Since the holding portions 31a and 31b have height adjusting means, the user can freely adjust the predetermined inclination of the bottom surface 22a of the UV meter sensor portion with respect to the bottom surface 21c of the measuring tank.

  Here, the measurement principle of the UV measurement apparatus of the present invention will be described. FIG. 5 is a schematic diagram showing the UV measurement principle of the measurement unit 20 of the UV measurement device according to the embodiment of the present invention. The measuring unit 20 has a function of measuring ultraviolet absorbance (UV), visible light absorbance (VIS), and turbidity correction signal (UV-VIS) of the test water. The measurement unit 20 includes a power supply unit 51 and a light source lamp 52. The measurement cell 54 is disposed at a position close to the light source lamp 52. In the UV measurement apparatus of the present invention, the measurement tank 21 serves as the measurement cell 54. A light separation splitter 53 is disposed between the light source lamp 52 and the measurement cell 54, a light receiver 56 is provided on the optical path of the light separation splitter 53, and the light receiver 56 is connected to the reference signal line 58. Yes.

  The light receiver 57 is disposed at a position facing the light source lamp 52 with the measurement cell 54 interposed therebetween. The signal received by the light receiver 57 is input to the converter / calculator 60 via the amplifier 59. The measurement result processed by the converter / calculation unit 60 is output to the UV meter display unit 27 of FIG. The other end of the reference signal line 58 is connected to an amplifier 59.

  Next, the principle of UV measurement will be described with reference to FIG. At the same time as the sample water flows into the measurement cell 54, the light source lamp 52 is turned on. The light source lamp 52 emits light having a wavelength of 254 nm or 546 nm. Prior to passing through the measurement cell 54, the light is separated into light passing through the test water in the measurement cell 54 and light received by the light receiver 56 by the light separation splitter 53. The light received by the light receiver 56 is input to the amplifier 59 via the reference signal line 58.

  The light that has passed through the test water in the measurement cell 54 is received by the light receiver 57, and the light reception signal is amplified by the amplifier 59 and then sent to the converter / calculation unit 60, based on the known UV absorbance measurement principle. Ultraviolet absorbance (UV), visible light absorbance (VIS), and turbidity correction signal (UV-VIS) are measured and output from the output unit 61 to the UV meter display unit 27 in FIG. At this time, since the light separated by the light separation splitter 53 and received by the light receiver 56 does not pass through the test water, the light is input to the amplifier 59 via the reference signal line 58. It is used as a reference value or correction value for the measured value.

  Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a schematic diagram of a UV measuring apparatus according to the second embodiment of the present invention. Description of the same reference numerals as those in FIG. 1 is omitted.

  In the second embodiment of the present invention, the UV meter sensor unit 22 further includes fixing portions 32a and 32b for fixing the bottom surface 21c of the measurement tank to the bottom surface 22a of the UV meter sensor unit. The heights of the fixing units 32a and 32b are different from each other. Although FIG. 1 shows a case where the height of the fixing unit 32a is lower than the height of the fixing unit 32b, the height of the fixing unit 32b may be lower than the height of the fixing unit 32a. Since the heights of the fixing units 32a and 32b are different, the fixing units 32a and 32b are fixed to the bottom surface 21c of the measurement tank so that the bottom surface 22a of the UV meter sensor unit has a predetermined inclination with respect to the bottom surface 21c of the measurement tank. be able to.

  The fixing units 32a and 32b may be completely integrated with the UV meter sensor unit 22 and cannot be detached from the bottom surface 22a of the UV meter sensor unit, or can be detached from the bottom surface 22a of the UV meter sensor unit. It may be anything. The fixing units 32a and 32b may further include a height adjusting unit for adjusting the height of the fixing units 32a and 32b. Since the fixing units 32a and 32b have height adjusting means, the user can freely adjust a predetermined inclination of the bottom surface 22a of the UV meter sensor unit with respect to the bottom surface 21c of the measuring tank.

  As in the first embodiment of the present invention, in the second embodiment of the present invention, the predetermined inclination of the bottom surface 22a of the UV meter sensor unit with respect to the bottom surface 21c of the measurement tank is 10 degrees or more. It is preferably within a range of 15 degrees or less.

  Next, a third embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a schematic diagram of a UV measuring apparatus according to the third embodiment of the present invention. FIG. 4 is a plan view of the measuring tank of the UV measuring apparatus according to the third embodiment of the present invention shown in FIG. Description of the same reference numerals as those in FIG. 1 is omitted.

  In the third embodiment of the present invention, as shown in FIGS. 3 and 4, the measurement tank 21 further includes an inlet 21 a provided in the measurement tank 21 for flowing the defoamed sample water into the measurement tank 21, Between the inlet 21a and the UV meter sensor unit 22, a rectifying plate 41 for adjusting the flow of the defoamed sample water flowing from the inlet 21a is provided.

  The height of the current plate 41 is at least higher than the water surface 26a of the defoamed sample water. The shape of the rectifying plate 41 is not particularly limited as long as the flow of the defoamed sample water flowing from the inlet 21a does not directly hit the UV meter sensor unit 22.

  With reference to FIG. 4, the effect of the measurement tank 21 including the rectifying plate 41 will be described. The flow X of the defoamed sample water flowing in from the inlet 21a is divided in the horizontal direction of the flow straightening plate 41 by the flow straightening plate 41 and is divided into the flow Y and the flow Z. The flow velocity of the flow Y and the flow Z is slower than that of the flow X. By providing the flow straightening plate 41 in the measurement tank 21, it is possible to prevent the defoamed sample water having a high flow velocity and having a large amount of air bubbles contained in the measurement tank from directly hitting the UV meter sensor unit.

  In FIG. 4, the rectifying plate 41 is provided for the UV measuring apparatus of the first embodiment of the present invention, but the rectifying plate 41 is provided for the UV measuring apparatus of the second embodiment of the present invention. It may be provided.

1 is a schematic diagram of a UV measurement device according to a first embodiment of the present invention. It is a schematic diagram of the UV measuring device which concerns on 2nd embodiment of this invention. It is a schematic diagram of the UV measuring device which concerns on 3rd embodiment of this invention. It is a top view of the measurement tank of the UV measuring device which concerns on 3rd embodiment of this invention in FIG. It is a schematic diagram which shows the UV measurement principle about the measurement part of the UV measurement apparatus in embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 UV measuring device 11 Defoaming means 12 Defoaming tank 20 Measuring part 21 Measuring tank 21a Inlet 21b Outlet 21c Bottom 22 UV meter sensor part 22a Bottom 23 Light emitting part 24 Light receiving part 25 Space part 26 Defoamed sample water 26a Water surface 27 UV meter display unit 31a, 31b Holding unit 32a, 32b Fixing unit 41 Current plate

Claims (4)

A defoaming tank equipped with a defoaming means for removing bubbles contained in the sample water;
A measuring unit for measuring the content of organic contaminants in the defoamed sample water from which bubbles have been removed in the defoaming tank,
The measuring unit is a measuring tank for storing the defoamed sample water in order to measure the content of the organic pollutant,
A UV meter sensor unit for measuring the content of organic contaminants in the defoamed sample water, and a light emitting unit for emitting light to the defoamed sample water on a bottom surface of the UV meter sensor unit and a light receiving unit for receiving the light A UV meter sensor unit comprising:
A UV meter display unit that displays the content of organic pollutants contained in the defoamed sample water sensed by the UV meter sensor unit;
Was placed in the measurement vessel to have a predetermined inclination with respect to the bottom surface of the bottom surface the measuring tank of the UV meter sensor unit,
The measurement tank further flows in from the inlet between the inlet provided in the measurement tank for flowing the defoamed sample water into the measurement tank, and the inlet and the UV meter sensor unit. A UV measurement device comprising: a rectifying plate that adjusts the flow of the defoamed sample water so that the defoamed sample water does not directly hit the UV meter sensor unit .   The measurement tank further includes a holding unit that holds the UV meter sensor unit on a bottom surface of the measurement tank, and the holding unit has a predetermined inclination with respect to the bottom surface of the measurement tank. The UV measurement apparatus according to claim 1, wherein the UV meter sensor unit is held so as to have.   The UV meter sensor unit further includes a fixing unit for fixing the bottom surface of the UV meter sensor unit to the bottom surface of the measurement tank, and the fixing unit has a bottom surface of the UV meter sensor unit with respect to the bottom surface of the measurement tank. The UV measuring apparatus according to claim 1, wherein the UV measuring apparatus is fixed to a bottom surface of the measuring tank so as to have a predetermined inclination.   4. The UV measuring apparatus according to claim 1, wherein a predetermined inclination of a bottom surface of the UV meter sensor unit with respect to a bottom surface of the measurement tank is in a range of 10 degrees to 15 degrees.

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