Specimen storage water tank

Abstract

To provide a sample water tank by which the filtration performance of cement-containing wastewater after filtration can be monitored and a filtered sample stored in the water tank can be kept suitable for analysis.SOLUTION: A sample storage water tank for temporarily storing samples after filtration comprises a feed port, a water level sensor, and a turbidity sensor. The feed port is provided on the lower side of the water tank so that the sample after filtration can be fed into the water tank. The water level sensor is configured to detect the water level of the sample accumulated in the water tank. The turbidity sensor comprises a light emitting part and a light receiving part, and is configured so that the light emitting part and the light receiving part face each other on an outer peripheral surface of the water tank so that the turbidity of the sample in the water tank can be detected.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a storage water tank for a specimen, and more particularly to a storage water tank for a specimen that temporarily stores a filtered specimen and can monitor the filtration performance of the specimen.

Background Art

[0002] Conventionally, solid components contained in wastewater or the like are removed by a filtration device, and the specimen other than the removed components is temporarily stored in a water tank. At that time, it is also monitored whether the filtration device has stable filtration performance. For example, in Patent Document 1, a hollow fiber membrane module is used for a filter, and it is disclosed that clogging of this filter is constantly monitored by a pressure sensor. Further, in Patent Document 2, it is disclosed that clogging of a hollow fiber filter is monitored by the flow rate indicated by a flow meter, and if it is lower than a set reference value, it is determined as clogging. Furthermore, in Patent Document 3, it is disclosed that the state of a filtration device is monitored based on measurements by a turbidity sensor, a flow rate sensor, a water level sensor, a pressure sensor, etc.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the clogging monitoring of the filter disclosed in Patent Document 1 observes the suction pressure generated by the suction pump for filtration with a pressure sensor. Therefore, in the case of filtration for collecting about 1 liter of specimen, the load on the filter becomes high.

[0005] In addition, the monitoring using the flowmeter disclosed in Patent Document 2 can monitor the clogging of the filter, but cannot monitor until solid components leak due to damage to the filter or the like.

[0006] In addition, when filtering wastewater containing cement generated in a fresh concrete manufacturing plant or the like and storing it in a specimen water tank, in the process of storing the specimen from above into the water tank after filtration, droplets are generated and the contact surface with carbon dioxide in the air increases, making it easier for solid components of calcium carbonate to precipitate.

[0007] Furthermore, the solid components generated on the liquid surface due to the vibration of the liquid surface when pouring the specimen from above settle, and the inside of the water tank becomes cloudy due to calcium carbonate.

[0008] And even if the specimen in such a state is analyzed for dissolved components such as sulfuric acid, calcium, aluminum, iron, chlorine, carboxylic acid, and saccharide by an analyzer in a subsequent process, there is a problem that it is difficult to be suitable for analysis due to the influence of the precipitated solid components.

[0009] The present invention has been made in view of such circumstances, and an object thereof is to provide a specimen water tank capable of monitoring the filtration performance after filtering wastewater containing cement and maintaining a state suitable for analysis of the filtered specimen stored in the water tank.

Means for Solving the Problems

[0010] According to one aspect of the present invention, there is provided a specimen storage water tank for temporarily storing a filtered specimen. This specimen storage water tank includes a supply port, a water level sensor, and a turbidity sensor. The supply port is provided on the lower side surface of the water tank so as to be able to supply the filtered specimen into the water tank. The water level sensor is configured to detect the water level of the specimen accumulated in the water tank. The turbidity sensor includes a light emitting part and a light receiving part, and the light emitting part and the light receiving part are configured to face each other on the outer peripheral surface of the water tank so as to be able to detect the turbidity of the specimen in the water tank.

[0011] In the configuration of the present invention, a water level sensor and a turbidity sensor can monitor the leakage of solids due to clogging or damage of the filtration device. Further, by supplying the filtered sample from the lower side surface of the water tank, it becomes difficult for the inside of the water tank to become turbid, and the sample suitable for analysis is obtained.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0013] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Various characteristic matters shown in the following embodiments can be combined with each other.

[0014] 1. Overall Configuration In the first section, an overall configuration configured to be able to measure the component analysis of a sample contained in wastewater or the like online will be outlined. Fig. 1 is an overall configuration schematic diagram for online measurement.

[0015] As shown in Fig. 1, the overall configuration 1 for online measurement is composed of a sample storage water tank 10, a filtration device 20, an analysis device 30, a washing water tank 40, a drainage tank 50, and the like.

[0016] (Filtration Device) The sample filtered by the filtration device 20 is temporarily stored in the sample storage water tank 10, and a part of it is analyzed by the analysis device 30.

[0017] (Washing Water Tank) The washing water tank 40 is used for washing the specimen storage tank 10 and the analyzer 30 after analysis. Also, the drainage tank 50 is used when draining a part of the specimen or draining the specimen before washing in order to obtain a specimen suitable for analysis.

[0018] The filtration device 20 may adopt the one invented by the applicant in Japanese Patent Application No. 2020-101781, but is not limited to the filtration method such as cross-flow filtration or total volume filtration, and any filtration method may be used as long as solid-liquid separation can be performed and a clear specimen can be obtained.

[0019] (Analyzer) The analyzer 30 may be any device that uses the liquid part such as wastewater as a specimen. For example, liquid chromatography, hydrogen ion concentration, spectrophotometer, dissolved oxygen concentration meter, etc. may be mentioned, and it may be used for various analyses as long as it can be used.

[0020] (Drainage Tank) The drainage tank 50 is used to temporarily store the specimen after the analysis and the water used for washing the specimen storage tank 10, and is used to transfer the specimen and the washing water to a drainage site away from the specimen and the washing water using a drainage pump (not shown). There are no restrictions on the material, shape, or capacity. In addition, if the drainage site is close by, the drainage tank may not be used, and the specimen and the washing water may be directly drained from the specimen storage tank to the drainage site through a drain pipe, a hose, or the like.

[0021] 2. Specimen Storage Tank In the second section, the specimen storage tank 10 of the present invention will be described. FIG. 2 is a diagram showing the specimen storage tank of the present invention, where (a) is a front view and (b) is a top view. The specimen storage tank 1 according to the present invention has a rectangular parallelepiped shape, and is a component for on-line measurement used for analyzing components contained in wastewater or the like as described above, and is installed between the filtration device 20 and the analyzer 30. As shown in FIG. 2, the specimen storage tank 10 mainly includes a supply port 11, an overflow wall 12, a water level sensor 13, a turbidity sensor 14, and a guide wall 15.

[0022] (Supply Port) The supply port 11 is for supplying the specimen filtered upstream to the specimen storage water tank 10, and is provided on the lower side surface of the specimen storage water tank 10. Specifically, the supply port 11 is provided at a predetermined height from the placement surface on the side surface of the specimen storage water tank 10. Here, the predetermined height only needs to make the liquid level less likely to fluctuate when supplying the specimen, and the closer to the placement surface, the better.

[0023] As a result, compared with the case of supplying the specimen from above, the liquid level of the specimen supplied into the water tank is less likely to fluctuate. For example, when the specimen contains components including cement, the amount of contact with carbon dioxide in the air decreases, thereby reducing the precipitation amount of calcium carbonate. In addition, the disturbance of the liquid level can be minimized, and even if deposits are generated on the liquid level, they do not settle and do not deposit inside the water tank, so it is easy to maintain the cleanliness of the specimen. In addition, since the liquid level is less likely to fluctuate, the measurement of the water level sensor 13 described later can be stably performed. Preferably, the supply rate into the water tank is 1 liter / minute or less. As a result, the liquid level is even less likely to fluctuate, and the deposits are also less likely to settle.

[0024] (Overflow wall) The overflow wall 12 is provided to divide the inside of the specimen storage water tank 10 into a storage chamber 10a and a discharge chamber 10b. As a result, when the specimen is stored in the storage chamber 10a in a predetermined amount or more, the deposits deposited on the liquid level will overcome the overflow wall 12 and be discharged to the discharge chamber 10b by gravity. Specifically, for example, when the specimen for analysis contains components including cement, calcium carbonate is deposited on the liquid level by contacting with carbon dioxide. When discharging the specimen from the discharge port 17 provided below the storage chamber 10a in such a state, there is a problem that calcium carbonate adheres to the inner wall surface from top to bottom. And thereby, it takes time for cleaning.

[0025] Therefore, by allowing the calcium carbonate deposited on the liquid surface to cross over the overflow wall 12 and be discharged, in other words, by discharging what has accumulated above from above, efficient cleaning can be performed, and the cleanliness of the specimen in the storage chamber 10a after filtration can be maintained.

[0026] Also, preferably, the depth D of the overflow wall 12 makes it easier to discharge the deposits formed on the liquid surface as it is wider, but it can be appropriately changed according to the surrounding environment.

[0027] (Water level sensor) The water level sensor 13 is configured to detect the water level of the specimen and the cleaning water accumulated in the storage chamber 10a (specimen storage water tank 10). Specifically, the water level sensor 13 is provided to detect full water level below the height of the overflow wall 12.

[0028] Thereby, it is possible to monitor the clogging situation of the filtration filter in the filtration device 20 based on the elapsed time from the start time when the specimen starts to accumulate in the storage chamber 10a (specimen storage water tank 10) until it is detected by the water level sensor 13. Also, based on the detection signal, it is possible to stop the supply of the specimen and the cleaning water, or set the time until stopping with a timer. Further, using the detection signal when the specimen accumulates, it is possible to start the analyzer 30, or using the detection signal when the cleaning water accumulates, it is possible to start the line cleaning of the analyzer.

[0029] (Turbidity sensor) The turbidity sensor 14 includes a light emitting unit 14a and a light receiving unit 14b. These are configured on the outer peripheral surface of the specimen storage water tank 10 so as to face each other and be able to detect the turbidity of the specimen in the storage chamber 10a (specimen storage water tank 10). The turbidity sensor 14 is not limited to this, and may be something that irradiates light, measures the amount of light transmitted, or measures the amount of light reflected.

[0030] Thereby, it is possible to monitor the leakage of solids due to damage of the filtration filter in the filtration device 20. In addition, since the water level sensor 13 and the turbidity sensor 14 can monitor the filtration performance before analysis, the analyzer 30 can be protected.

[0031] (Aquarium window) Such a turbidity sensor 14 is preferably provided in the transparent aquarium 10. However, if it is not transparent, it is preferable to provide an aquarium window 16 on the side surface of the aquarium 10 facing the turbidity sensor 14.

[0032] (Guide wall) The guide wall 15 is configured such that the washing water supplied from the supply port 11 is guided and hits the inner peripheral surface of the aquarium 10 or the aquarium window 16 where the light emitting part 14a and the light receiving part 14b face each other.

[0033] Thereby, by simply starting the supply of the washing water performed for each analysis so that dirt does not adhere to the inner peripheral surface of the aquarium 10 or the aquarium window 16, automatic cleaning can be efficiently performed. Thereby, the reliability of the sensor can be maintained.

[0034] (Operation) A typical operation in the specimen storage aquarium 60 of the present invention will be described below. When the preset analysis start time arrives, the filtration of the waste water starts in the filtration device 20, and the filtered specimen is supplied from the supply port 11 into the storage chamber 10a. At the same time, the timer is activated by the analysis start signal, and after a certain period of time, the valve of the discharge port 17 provided below the storage chamber 10a is closed to start the storage of the specimen in the storage chamber 10a.

[0035] Note that the set time of the timer is set to a time sufficient to fill the pipe from the filtration device 20 to the specimen storage aquarium 10 with the specimen and replace the specimen and washing water remaining from the previous analysis with the specimen. For example, although it depends on the length of the pipe, it is good to set it to about 30 seconds as a guide.

[0036] In addition, the liquid level of the sample that has started to accumulate in the storage chamber 10a gradually rises. At this time, calcium carbonate begins to precipitate in a film-like manner so as to cover the liquid level upon contact with carbon dioxide in the air. However, the supply rate is gently reduced to 1 liter / minute or less and the sample is supplied from the lower side surface so that the liquid level is not disturbed, suppressing the sedimentation of calcium carbonate generated on the liquid level and enabling the inside of the sample to be kept clean.

[0037] Next, when the rising liquid level reaches the water level sensor 13, a full water signal is issued. It is preferable to activate a timer with this full water signal and continue supplying the sample until a part of the sample exceeds the overflow wall 12 and the precipitate on the liquid level flows out, and then stop supplying the sample.

[0038] At this time, by measuring the time from when the valve of the discharge port 17 closes until the full water signal of the water level sensor 13 is issued, clogging of the filter can be detected, and damage to the filter can be monitored by the turbidity sensor 14 arranged on the outer peripheral surface of the storage water tank 10.

[0039] Furthermore, by operating the pump 19 with the full water signal, the sample is sucked up into the analyzer 30 for component analysis. After that, upon receiving the completion signal of the analysis operation, the sample is drained from the discharge port 17, and then cleaning water is supplied from the supply port 11 until it sufficiently exceeds the overflow wall to wash away the remaining sample in preparation for the next analysis.

[0040] 3. Modification Example 1 In Section 3, Modification Example 1 of the sample storage water tank 60 of the present invention will be described. However, the description of the common parts with the sample storage water tank 10 according to the embodiment in Section 2 will be omitted.

[0041] FIG. 3 is a top view of a sample storage water tank showing a modification of FIG. 2(b). As shown in FIG. 3, in Modification Example 1, the position and angle of the guide wall 65 are different. Specifically, the guide wall 65 is provided so as to be mirrored on the side far from the supply port 11 (the overflow wall 12 side). Accordingly, the water tank window 66 and the turbidity sensor 64 are also moved so that the cleaning water hits them. These arrangement positions can be appropriately changed according to the size of the water tank and the like. In the first modification, the distance from the supply port 11 to the branch point α of the guide wall 65 is increased. As a result, the cleaning water supplied from the supply port 11 hits the guide wall 65, generating complex flowing water with splashing, which is guided to the water tank window 66 where the turbidity sensor 64 is arranged, so that effective dirt prevention of the water tank window 66 becomes possible.

[0042] 4. Second modification In Section 4, a second modification of the specimen storage water tank 70 of the present invention will be described. However, the description of the common parts with the specimen storage water tank 10 according to the embodiment in Section 2 will be omitted.

[0043] FIG. 4 shows a modification of FIG. 2, where (a) is a front view and (b) is a top view. As shown in FIG. 4, in the second modification, the functions of the overflow wall 12 and the guide wall 15 in the embodiment of Section 2 are combined into one. Specifically, the overflow wall 72 is formed in an arc shape. And the cleaning water hits the arc surface and is configured to be guided to the arc surface and hit the water tank window 16. Thereby, the water tank window 16 can be cleaned.

[0044] 5. Conclusion As described above, according to the present embodiment, it is possible to provide a specimen water tank that can monitor the filtration performance after filtration of wastewater containing cement and can maintain the filtered specimen stored in the water tank in a state suitable for analysis.

[0045] The specimen storage water tank may be provided in each of the following aspects. In the specimen storage water tank, an overflow wall is further provided, and the overflow wall is configured to divide the inside of the water tank into a storage chamber and a discharge chamber. When a predetermined amount or more of the specimen is stored in the storage chamber, the precipitate deposited on the liquid surface overflows the overflow wall and is discharged to the discharge chamber by gravity. In the specimen storage water tank, the precipitate is calcium carbonate precipitated by the specimen and carbon dioxide in the air. In the specimen storage water tank, when supplying the filtered specimen from the supply port to the storage chamber, the supply rate is 1 liter / minute or less. In the specimen storage water tank, the storage chamber is provided with a guide wall, and the guide wall is configured such that the liquid supplied from the supply port is guided and hits the inner peripheral surface of the water tank facing the light emitting part and the light receiving part. In the specimen storage water tank, the supply port and the turbidity sensor are provided at the same height from the mounting surface of the water tank. In the specimen storage water tank, a water tank window is provided on the side surface of the water tank facing the turbidity sensor. Of course, this is not all.

[0046] Finally, although the embodiments and modifications according to the present invention have been described, these are presented as examples and are not intended to limit the scope of the invention. The novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. The embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalent scope thereof.

Explanation of reference numerals

[0047] 1 Overall configuration 10 Specimen storage water tank 10a Storage chamber 10b Discharge chamber 11 Supply port 12 Overflow wall 13 Water level sensor 14 Turbidity sensor 14a Light emitting part 14b Light receiving part 15 Guide wall 16 Water tank window 17, 18 Drain port 20 Filtration device 30 Analyzer 40 Wash water tank 50 Drain Tank

Claims

1. A filtration device, a specimen storage water tank for temporarily storing a specimen filtered by the filtration device, a supply port for supplying the specimen filtered by the filtration device into the water tank, a water level sensor for detecting the water level of the specimen accumulated in the water tank, a turbidity sensor for detecting the turbidity of the specimen in the water tank and comprising the supply port is provided on the lower side surface of the water tank, the turbidity sensor comprises a light emitting part and a light receiving part, and the light emitting part and the said light receiving part are configured to face each other on the outer peripheral surface of the water tank, a specimen measurement system.

2. In the specimen measurement system according to Claim 1, the water tank further comprises an overflow wall, the overflow wall is configured to divide the inside of the water tank into a storage chamber and a discharge chamber, the height of the overflow wall is configured to be lower than the height of the water tank, when a predetermined amount or more of the specimen is stored in the storage chamber, calcium carbonate precipitated on the liquid surface overcomes the upper surface of the overflow wall and is discharged by gravity to the discharge chamber, a specimen measurement system.

3. In the specimen measurement system according to Claim 2, when supplying the specimen filtered by the filtration device from the supply port to the storage chamber, the supply speed is 1 liter / minute or less, due to the supply from the lower side surface of the water tank and the supply speed, the disturbance of the liquid surface is suppressed, and the sedimentation of the calcium carbonate precipitated on the liquid surface is suppressed, a specimen measurement system.

4. In the specimen measurement system according to Claim 3, the storage chamber comprises a guide wall, the guide wall is configured such that the liquid supplied from the supply port is guided and hits the inner peripheral surface of the water tank where the light emitting part and the light receiving part face each other, a specimen measurement system.

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