JP2004226371A - Sample water analyzing unit and sample water analyzing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sample water analyzing unit and a sample water analyzing device which can make an analysis using a detector even if collected sample water contains a large amount of SS in water quality analysis. <P>SOLUTION: The sample water analyzing device 1 comprises a detector 2 having a detecting part 2a and a sample water analyzing unit 3. The sample water analyzing unit 3 comprises a cell 7 having a substantially-cylindrical side wall 7a, and the detector 2 is attached to the upper part of the cell 7. The cell 7 has an introducing port 4 for sample water W, an overflow port 5 and a discharge port 6. An introducing pipe 8 for introducing the sample water into the cell 7 is connected to the introducing port 4. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sample water analysis unit and a sample water analyzer. More specifically, the present invention relates to a sample water analysis unit and a sample water analysis apparatus that can perform analysis using a detector even if a large amount of SS is contained in sample water collected in water quality analysis or the like.
[0002]
[Prior art]
Conventionally, various water quality analyzes have been performed on water such as river water, domestic wastewater, and industrial wastewater. When water quality analysis is performed using such water as the sample water, the collected sample water contains solids such as mud, sand, sludge, etc. SS is included). When these SS components enter the water quality analyzer, the pipes and the like are blocked. Conventionally, before introducing the sample water into the water quality analyzer, the sample water is used as a sand filter or the like as a pretreatment. The SS component in the sample water was removed through the pretreatment device.
However, performing such preprocessing places a large burden on maintenance of the preprocessing apparatus.
[0003]
Therefore, by increasing the flow rate of the sample water to make it difficult for the SS component to stay in the apparatus, the pipe diameter is increased to reduce the cause of the blockage, and thus the pretreatment by the sand filtration apparatus as described above is performed. An unnecessary reagent-free residual chlorine meter has also been developed (see Patent Document 1).
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-275214
[Problems to be solved by the invention]
However, the conventional non-reagent type residual chlorine meter as described above is a comparatively clean one in which SS is removed to some extent, such as sewage effluent water. Therefore, when trying to analyze water with a large amount of SS, there is a problem that accurate measurement is hindered by the SS, and that clogging occurs immediately after the start of measurement.
[0006]
On the other hand, in the combined sewer system, which treats rainwater with domestic wastewater, etc., the capacity of the final treatment plant will be exceeded when the rainfall increases, so chlorination will be performed by treating part of the water to be treated as untreated overflow water. It is released into public waters only by disinfecting bromine and bromine, or as simple treated water after chlorine treatment or bromine disinfection after simple treatment at the final treatment plant. The amount of dirt including SS contained in this untreated overflow water and simple treated water is not the ratio of sewer effluent. Therefore, in order to analyze overflow untreated water and simple treated water, it is necessary to install a pretreatment device for removing dirt even when the above-described reagentless residual chlorine meter is used. .
[0007]
The present invention has been made in view of the circumstances as described above, and provides a sample water analysis unit and a sample water analysis apparatus that can perform analysis using a detector even if there is a large amount of SS in the sample water. The challenge is to do.
[0008]
[Means for Solving the Problems]
A first invention of the present invention that solves the above-described problems includes a cell having a substantially cylindrical side wall, and a detector having a detection unit that is brought into contact with sample water. A discharge port connected to a pipe having a drain valve that can be opened and closed is provided at the bottom, and an overflow port is provided at a position above the detection unit when the detector is mounted on the side wall of the cell. An introduction pipe for introducing sample water into the cell is connected to a position below the detection part when the detector is attached on the side wall of the cell. The sample water analysis unit is characterized in that the sample water introduced from the tube is configured to generate a swirling flow swirling in the cell.
According to the present invention, sample water is introduced into the cell to generate a swirling flow. Since this swirl flow has an overflow port above the cell, the swirl flow gradually rises in the cell. Further, the swirling flow causes a downward flow at the center of the cell. For this reason, the SS component (leaves, etc.) with a lower specific gravity than the water contained in the sample water rises to the surface of the water, while the SS component such as sand and mud with a higher specific gravity than the water sinks in the cell. As a result, the SS component is separated from the sample water. Therefore, it is possible to accurately measure the measurement target component (chlorine, bromine, etc.) without hindering or blocking the analysis due to the SS component.
[0009]
In the first invention, the bottom of the cell is preferably tapered. This makes it easier for the swirling flow to rise in the cell. In addition, the settled SS is easily concentrated at the center of the bottom, and is easily removed from the cell.
[0010]
In the first aspect of the invention, it is preferable that a pipe provided with a slow leak valve capable of adjusting a drainage amount is connected to the discharge port. By draining the sample water in the cell little by little continuously or intermittently from this pipe, the flow of the downward flow is strengthened, and the SS portion having a large specific gravity tends to settle.
[0011]
In the first invention, it is preferable that a pipe is connected to the overflow port along the outflow direction of the swirling flow. The SS portion with a small specific gravity that has risen near the water surface swirls on the water surface near the inner wall of the cell along the direction in which the swirl flows, so these pipes are connected in a direction parallel to the direction in which the swirl flows. Of SS is easily discharged from the overflow port.
[0012]
In the first aspect of the invention, it is preferable that at least one washing water jet nozzle is provided between the inner wall of the cell and the detector at the upper part of the cell. Thereby, after the analysis of the sample water, the water surface portion of the cell inner wall and the detection portion of the detector can be cleaned simultaneously. In addition, automatic cleaning can be performed.
[0013]
In the first invention, the cell is preferably shielded from light. Thereby, growth of microorganisms, such as algae, in a cell can be suppressed.
[0014]
The second invention of the present invention that solves the above-mentioned problems is a sample water analyzer comprising the sample water analysis unit of the first invention described above and a detector having a detector that contacts the sample water.
The sample water analyzer of the present invention has a function of removing the SS component in the sample water, and can accurately measure the component to be measured without causing an obstacle or blockage of the analysis due to the SS component. .
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments.
FIG. 1 is a schematic diagram of a sample water analyzer 1 according to the first embodiment of the present invention.
The sample water analyzer 1 includes a detector 2 having a detection unit 2 a and a sample water analysis unit 3.
The sample water analysis unit 3 includes a cell 7 having a substantially cylindrical side wall 7 a and a bottom 7 b, and the detector 2 is attached to the top of the cell 7.
[0016]
The cell 7 has a sample water W introduction port 4, an overflow port 5, and a discharge port 6.
The introduction port 4 is provided at a position below the detection unit 2a on the side wall 7a. The position of the introduction port 4 is not particularly limited as long as it is below the detection unit 2a, but it is preferably provided at a position below the cell side wall 7a and as close to the bottom 7b as possible.
An introduction pipe 8 for introducing sample water into the cell 7 is connected to the introduction port 4. As shown in FIG. 2, the introduction pipe 8 is connected substantially horizontally with an inclination of an angle θ _{1 in} the tangential direction of the side wall 7 a from the perpendicular l to the side wall 7 a. Therefore, the sample water W introduced into the cell 7 from the introduction pipe 8 generates a swirling flow F that swirls in the cell 7. Angle θ ₁ = 40~90 °, preferably 80-90 °.
The connection direction of the introduction pipe 8 may be slightly shifted up and down from the substantially horizontal direction. However, if the introduction direction of the sample water W through the introduction pipe 8 is too upward, the comparison of the SS portion having a higher specific gravity than water is performed. There is a possibility that a material having a low specific gravity is difficult to settle. Further, since a certain amount of time is required for the separation (floating and sinking) of SS, it is necessary that the swirling flow F rises to the water surface over a certain amount of time. However, if the introduction direction is too upward, the time is shortened, and therefore the SS component may not be sufficiently separated.
On the other hand, if the direction in which the sample water W is introduced by the introduction pipe 8 is too downward, an SS portion having a specific gravity smaller than that of the water may not easily rise. Moreover, since the time until the swirling flow F rises to the water surface becomes long, the replacement of the sample water becomes worse, and there is a possibility that accurate analysis cannot be performed.
Considering these, it is preferable that the connection direction of the introduction pipe 8 is in the range of + 5 ° to −5 ° with respect to the horizontal direction.
In addition, a strainer and a mesh filter are provided on the inlet port (not shown) of the introduction pipe 8 so that large sand, pebbles, leaves, wood pieces, and the like are removed in advance.
[0017]
The overflow port 5 is provided on the side wall of the cell 7 at a position above the detection unit 2a. A pipe 9 is connected to the overflow port 5, and sample water W exceeding the capacity of the cell 7 is discharged through the pipe 9.
As shown in FIG. 2, the pipe 9 is connected substantially horizontally with an inclination of an angle θ ₂ from the perpendicular m to the side wall 7a to the tangential direction of the side wall 7a so as to follow the outflow direction of the swirl flow of the sample water W. Has been. Thereby, the swirl | vortex flow F of the sample water W is guide | induced to the piping 9 smoothly. The angle θ ₂ = 40 to 90 °, preferably 80 to 90 °.
[0018]
The discharge port 6 is provided near the center of the bottom 7 b of the cell 7. A pipe 11 having a drain valve 10 that can be opened and closed is connected to the discharge port 6. By opening the drain valve 10, the sample water W in the cell 7 can be discharged through the pipe 11. Yes. The drain valve 10 is closed during the analysis and is opened after the analysis.
In the present embodiment, the bottom 7 b of the cell 7 has a tapered shape that is inclined downward toward the discharge port 6.
[0019]
The material of the cell 7, the introduction pipe 8, and the pipes 9 and 11 is not particularly limited as long as it has corrosion resistance and durability against the sample water to be measured, and plastic, metal, ceramic, and the like can be used.
The capacity of the cell 7 is not particularly limited. For example, a capacity of about 5 L is preferable because a large amount of sample water can be analyzed.
The diameters of the introduction port 4 and the introduction pipe 8 are not particularly limited, but in order to prevent clogging due to the SS component contained in the introduced sample water W, it is preferably about φ20 mm.
The diameter of the pipe 9 is not particularly limited, but is preferably about φ25 mm so as not to be blocked by the SS component having a relatively low specific gravity that floats on the water surface.
[0020]
The cell 7 is shielded from light to suppress the growth of microorganisms such as algae in the cell. In order to shield the light, the cell 7 itself may be formed of a light-shielding material, for example, acrylic. However, a separate light-shielding curtain such as a polyethylene dark curtain is prepared, and the cell 7 is covered with this light-shielding curtain. May be.
[0021]
Further, the sample water analysis unit 3 is provided with a cleaning water jet nozzle 12 for cleaning the inner wall of the cell 7 and the detection unit 2 a of the detector 2 between the detector 2 and the inner wall of the cell 7. . A washing water line 13 for sending washing water is connected to the washing water jet nozzle 12.
[0022]
There is no restriction | limiting in particular in the kind of detector 2, According to the measuring object in sample water, it can select suitably. Examples thereof include a redox electrode, a pH electrode, an ion electrode, a conductivity electrode, a dissolved oxygen electrode, and an optical sensor.
[0023]
Next, the usage method of the sample water analyzer 1 shown in FIG. 1 is demonstrated using FIG. FIG. 3 is a diagram showing a state in the sample water analysis unit 3 when the sample water analyzer 1 is used. (A) is a longitudinal sectional view of the cell 7 and (b) a pipe 9 of the cell 7 is provided. It is a cross-sectional view in the provided position.
As shown in FIG. 3, when sample water is introduced from the introduction pipe 8, a swirl flow F swirling in the cell 7 is generated. With the generation of the swirling flow F, the water surface rises at the periphery of the cell 7 on the sample water surface.
The flow rate at which the sample water is introduced is not particularly limited as long as it is a flow rate capable of generating a swirling flow, and may be appropriately determined according to the volume of the cell 7 or the like. For example, when the volume of the cell 7 is 5 to 6 L, it is preferably about 5 to 10 L / min.
Since the sample water W is discharged from the overflow port 5 above the cell 7, the swirling flow F gradually rises in the cell 7.
Here, since the shape of the bottom portion 7b is tapered, the swirl flow F is more likely to occur, and the swirl flow F is more likely to rise.
[0024]
At this time, among SS components in the swirling flow F, those having a specific gravity smaller than water (such as leaves) float to the surface of the water, and as shown in FIG. Gather and move around according to the direction of the swirling flow. Then, it is discharged from the overflow port 5 through the pipe 9. Here, since the pipe 9 is connected along the outflow direction of the swirl flow, the SS portion that is migrating is easily discharged.
[0025]
On the other hand, an SS component (sand, pebbles, etc.) having a specific gravity greater than that of water gathers in the central direction of the swirling flow F and sinks onto the bottom 7b of the cell 7 as indicated by an arrow D due to gravity.
[0026]
After the analysis, by opening the drain valve 10, the sample water W in the cell 7 and the sedimented SS can be discharged.
Here, since the shape of the bottom portion 7b is tapered, the settled SS component easily flows toward the discharge port 6. Therefore, the SS can be easily removed from the discharge port 6.
At the same time as or after discharge of the sample water W and the settled SS, the inside of the cell 7 and the detector 2 are cleaned using the cleaning water jet nozzle 12.
Since the washing water injection nozzle 12 is provided between the detector 2 and the inner wall of the cell 7, after analyzing the sample water, as shown in FIG. The detection unit can be cleaned at the same time.
[0027]
Hereinafter, based on FIG. 5, sample water analyzer 1 'of 2nd Embodiment which concerns on this invention is demonstrated. In the embodiment described below, the same reference numerals are given to the components corresponding to the first embodiment, and the detailed description thereof is omitted.
In the present embodiment, the discharge port 6 is connected to a pipe 21 provided with a slow leak valve 20 capable of adjusting the amount of drainage, and is provided with two washing water injection nozzles 12 and 12. Different from one embodiment.
[0028]
The slow leak valve 20 is opened continuously or intermittently during the analysis of the sample water. When the slow leak valve 20 is opened, the sample water is discharged from the discharge port 6.
By adjusting the slow leak valve 20, the amount of sample water drained (slow leak amount) can be adjusted. At this time, if the amount of slow leak is too large, the sample water W introduced from the introduction port is discharged as it is, and it is difficult to rise to the water surface, and the replacement of the sample water W in the cell 7 may be deteriorated. Therefore, the amount of slow leak is preferably about 10 to 50% of the amount of sample water introduced.
[0029]
When the sample water is discharged from the discharge port 6, a downward flow is generated near the center in the vertical direction of the cell 7. This downward flow accelerates the sedimentation due to the gravity of SS having a specific gravity greater than that of water, so that the SS component having a specific gravity greater than that of water is more likely to settle. Among them, the SS component having a specific gravity slightly higher than that of water is usually difficult to settle, but can be settled relatively quickly by opening the slow leak valve 20 and generating a downward flow.
The strength of the downward flow increases as the amount of slow leak increases, and can be adjusted by adjusting the slow leak valve 20.
[0030]
In the present embodiment, the two washing water spray nozzles 12 and 12 are respectively disposed in symmetrical positions around the detector 2 in the cell side wall 7 a on the cell 7.
Thereby, a wider range of cleaning can be performed than in the case of the first embodiment.
[0031]
In the first and second embodiments described above, a water sampling port for performing manual analysis is provided at an arbitrary position between the inlet 4 and the overflow port 5 on the side wall 7a of the cell 7. Also good. Thereby, the sample water from which SS has been removed can be collected and used for manual analysis.
[0032]
Further, in the first and second embodiments described above, the shape of the bottom 7b of the cell 7 is tapered, but the present invention is not limited to this, and for example, the cell longitudinal section is substantially U-shaped. It may be a hemispherical shape.
[0033]
Further, one cleaning water injection nozzle 12 is provided in the first embodiment and two cleaning water injection nozzles 12 are provided in the second embodiment, but preferably there are two or more cleaning water injection nozzles 12, more preferably 2-5. If about one is provided, a wider range can be reliably washed.
[0034]
【Example】
In order to clarify the effects of the present invention, the following tests were conducted.
Test 1
Similar to the sample water analyzer 1 ′ shown in FIG. 5, the sample water analysis unit 3 provided with measurement electrodes (CLR-21-1, manufactured by Toa DKK Co., Ltd.) and the following conditions Then, the following operation was performed.
First, about 300 mL of SS, in which leaves, seeds, and earth and sand were randomly mixed, was weighed into a 300 mL beaker. Next, a flow rate of water of 5 L / min is introduced into a cell 7 having a capacity of about 6 L (a cylindrical shape having a diameter of 15 cm and a height of 32 cm) through an introduction pipe 8 (caliber: φ20 mm, connection angle θ ₁ = 90 °). in introducing, from the water overflow port 5 in the cell 7, the pipe 9 (diameter: 25mm, connection angle θ ₂ = 90 °) when it becomes to be discharged via a pipe 21 (diameter: 25mm) The slow leak valve 20 was adjusted so that the amount of slow leak was 1 L / min, and the SS component was introduced into the cell 7 from the top of the cell 7. The charging for SS was repeated for 20 minutes every minute, and the measurement was completed 30 minutes after the start of charging for SS. After completion of the measurement, the valve 10 was opened, and the water in the cell 7 and the settled sediment were discharged through the pipe 11 (diameter: φ25 mm).
During this measurement, the influence of the SS component on the measurement electrode and the behavior of the SS component in the cell 7 were verified visually.
As a result, leaves and seeds having relatively small specific gravity were gradually discharged from the overflow port 5 while turning around the inner wall of the cell on the water surface.
On the other hand, the earth and sand having a relatively large specific gravity settled while gathering at the center of the swirling flow, and was discharged from the discharge port 6.
Further, during the measurement, adhesion of SS to the measurement electrode was not observed.
[0035]
Test 2
Residual chlorine analysis under the same conditions using the same sample water analyzer 1 ′ as used in Test 1 except that sewage effluent containing a large amount of SS containing calcium as a main component was used as sample water. Went.
As a result, no trouble occurred in the sample water analyzer 1 ′ during the continuous operation for about 9 months.
[0036]
【The invention's effect】
As described above, the sample water analysis unit and the sample water analysis device of the present invention can easily separate and remove the SS component in the sample water. Therefore, since it is not necessary to provide a pretreatment device such as a sand filtration device, it is possible to improve the reliability of the measurement value relating to the sample water and facilitate maintenance.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal sectional view of a sample water analyzer according to a first embodiment.
FIG. 2 is a schematic plan view of the sample water analyzer shown in FIG.
3A is a longitudinal sectional view and FIG. 3B is a front view showing a state in a sample water analysis unit when the sample water analyzer shown in FIG. 1 is used.
FIG. 4 is a diagram showing how the inner wall of the cell is cleaned and the detector is cleaned by the cleaning water injection nozzle.
FIG. 5 is a schematic view of a sample water analyzer according to a second embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Sample water analyzer, 1 '... Sample water analyzer, 2 ... Detector, 2a ... Detection part, 3 ... Sample water analysis unit, 4 ... Introduction port, 5 ... Overflow port, 6 ... Discharge port, 7 ... Cell , 7a ... side wall, 7b ... bottom, 8 ... introduction pipe, 9 ... piping, 10 ... drain valve, 11 ... piping, 12 ... washing water injection nozzle, 13 ... washing water line, 20 ... slow leak valve, 21 ... piping

Claims (7)

The side wall has a substantially cylindrical shape, and includes a cell having a detector attached to the upper portion, the detector having a detection portion that comes into contact with sample water.
The bottom of the cell is provided with a discharge port connected to a pipe having a drain valve that can be opened and closed,
An overflow port is provided on the side wall of the cell above the detection unit when the detector is attached,
An introduction pipe for introducing sample water into the cell is connected to a position below the detection part when the detector is mounted on the side wall of the cell, and the sample introduced from the introduction pipe A sample water analysis unit, wherein the water is configured to generate a swirling flow swirling in the cell. The sample water analysis unit according to claim 1, wherein the bottom of the cell is tapered. The sample water analysis unit according to claim 1 or 2, wherein a pipe having a slow leak valve capable of adjusting a drainage amount is connected to the discharge port. The sample water analysis unit according to any one of claims 1 to 3, wherein a pipe is connected to the overflow port along an outflow direction of the swirling flow. The sample water analysis unit according to any one of claims 1 to 4, wherein at least one washing water jet nozzle is provided between an inner wall of the cell and the detector at an upper part of the cell. The sample water analysis unit according to any one of claims 1 to 5, wherein the cell is shielded from light. The sample water analyzer provided with the sample water analysis unit as described in any one of Claims 1-5, and the detector which has a detection part made to contact sample water.

Images