JPH09304375A - Method and system for supplying sample water to automatic water analyzer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a system for supplying sample water to an automatic water analyzer which can reduce the frequency of inspection and maintenance against the growth of algae. SOLUTION: A sample water supply method includes a process for temporarily storing in a water collecting tank 4 the sample water pumped up with a water inlet 11, sunk beneath the level of the water, a process for supplying the sample water in the water collecting tank 4 to an automatic water analyzing device 1 to analyze the same, and a process for raising the water inlet 11 from the level of the water and for removing the sample water in a water collecting system. A sample water supply system includes a water collection means 3 which allows the water inlet to freely rise and fall relative to the level of the water; the water collecting tank 4 retaining the sample water fed from the water collection means 3; a decompression means 5 connected to the water collection means 3 to decompress the inside of the water collecting tank 4 to pump up the sample water, when the water inlet is located below the level of the water; and a pressurization means 6 for pressurizing the inside of the water collecting tank 4, in order to supply the sample water in the water collecting tank 4 to the automatic water analyzer 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sample water supply method and a sample water supply system for a water automatic analyzer capable of automatically measuring the total amount of organic carbon contained in factory wastewater, river water, etc. The present invention relates to a device capable of preventing algae from growing in a pipe for collecting water up to an automatic water analyzer.

[0002]

2. Description of the Related Art An automatic water analyzer is a device for quickly and accurately measuring the total amount of organic carbon online or offline, so that the sample water such as factory wastewater or river water can be measured when needed. A sample water supply method and a sample water supply system that directly connect a water sampling system and an automatic water analyzer are used.

Such a conventional sample water supply method and sample water supply system will be described with reference to FIG. 1 is an automatic water analyzer main body including an aeration tower, 2 is a drain for collecting and discharging the sample water, 101 is a pump for supplying the sample water to the automatic water analyzer main body 1. Is.

A suction pipe 102 having a water inlet 103 for the drain 2 is connected to a water inlet of a pump 101 and a circulation pipe 10 connected to a discharge of the pump 101.
The tip of 4 is submerged in the drainage channel 2. That is, the water sampling pipe 102, the pump 101, and the circulation pipe 104 are configured to constantly circulate the water in the drainage groove 2. A water sampling pipe 105 branched from a point X of the circulation pipe 104 is connected to the water automatic analyzer main body 1, and an overflow pipe 106 is arranged from the water automatic analyzer main body 1 toward the drain groove 2.

The sample water is constantly circulated in the circulation pipe 104 while maintaining a predetermined pressure so that the automatic water analyzer main body 1 can sample the sample water whenever necessary. When an open / close valve (not shown) in the water automatic analyzer main body 1 is opened, the sample water is supplied to the water automatic analyzer main body 1, and the excess sample water other than the sample water supplied is used as an overflow pipe. It is discharged to the drainage groove 2 via 106.

[0006]

In the above-described conventional sample water supply method and sample water supply system, since the pump 101 is used for continuous water sampling, the water sampling pipe 105 is particularly filled with sample water. The state that it did is kept. When the automatic water analyzer main body 1 does not operate, the sample water in the water sampling pipe 105 remains stationary. Therefore, with the passage of time, algae may be generated by the organic compounds and microorganisms in the sample water and proliferate in the water sampling pipe 105. The generation of algae is not limited to the water sampling pipe 105, but also occurs in the suction pipe 102 and the circulation pipe 104. If the algae in such a pipe is supplied to the water automatic analyzer main body 1 together with the sample water for measurement, accurate measurement becomes impossible.

Therefore, the generation status of algae in the water sampling system such as the water sampling pipe 105 is regularly inspected, and if algae are generated, maintenance such as cleaning is performed. Conventionally, there has been a problem that the frequency of this inspection and maintenance is high and it is a burden on the operator.

Therefore, the present invention is intended to provide a sample water supply method and a sample water supply system for an automatic water analyzer, in which the frequency of inspection and maintenance for algae generation is reduced to improve reliability.

[0009]

In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention is to temporarily store sample water sucked by sinking a water sampling port on a liquid surface in a water sampling tank. And a step of supplying the sample water in the water sampling tank to a water automatic analyzer for analysis, raising the water sampling port from the liquid level, and passing the water from the water sampling port through the water sampling tank. Emptying the sample water in the water sampling system up to the automatic analyzer, sample water is sampled when necessary, and no sample water remains in the water sampling system after analysis This is a method for supplying sample water to an automatic water analyzer.

Since the sample water is temporarily stored in the water sampling tank, the supply process from the water sampling tank can be easily and surely performed by pressurizing the inside of the water sampling tank. The process for discharging the sample water in the water sampling system is simple and reliable.

The invention according to claim 2 is the invention according to claim 1, wherein the sample water in the water sampling system is replaced with an inert gas so as to be emptied. Simultaneously with the replacement of the inert gas, the step of discharging the sample water in the water sampling system is performed.

Further, the invention according to claim 3 is such that a water collecting means for raising and lowering the water collecting port with respect to the liquid surface, a water collecting tank for storing the sample water from the water collecting means, and a water collecting means are connected. In order to supply the sample water in the water sampling tank with a depressurizing means for depressurizing the water sampling tank to suck up the sample water when the water sampling port is in the liquid level, And a pressurizing means for pressurizing the inside of the water sampling tank, so that the sample water can be supplied to the water automatic analyzer when necessary by repeatedly collecting water by the depressurizing means and supplying by the pressurizing means. The sample water supply system to the automatic water analyzer is characterized by the following.

By switching the depressurizing means and the pressurizing means to the water sampling tank, it is possible to both suck up the sample water and supply the sample water. Moreover, it is a system that can supply sample water to the water automatic analyzer when necessary, and by the pressurizing means for the inside of the water sampling tank,
The sample water in the water sampling system is also discharged at the same time.

According to a fourth aspect of the present invention, in the third aspect of the invention, the pressurizing means presses an inert gas into the water sampling tank. After that, the sample water in the water sampling system up to the water automatic analyzer is discharged by the replacement of the inert gas. Simultaneously with the replacement of the inert gas, the step of discharging the sample water in the water sampling system is performed.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to illustrated examples. FIG. 1 is a device layout view of a sample water supply system applied to the method of the present invention, and FIG. 2 is a device configuration view showing an example of a water automatic analyzer. In the following:
First, the sample water supply system will be described, and then the sample water supply method will be described. The embodiment described in detail below is the best mode for carrying out the invention, but it can be modified without departing from the spirit of the invention.

In FIG. 1, 3 is a water sampling means for sampling sample water from the drainage channel 4, 4 is a water sampling tank, 5 is a vacuum pump as a pressure reducing means, 6 is a nitrogen cylinder as a pressurizing means, Reference numeral 7 is a water sampling pipe, which constitutes a sample water sampling system. Note that the connection points of the pipes that make up the water sampling system are removable so that the inspection and maintenance of the inside of the pipes and equipment can be performed easily. It is also possible to make the pipes of the water sampling system transparent so that the condition of contamination inside can be inspected from the outside.

The water sampling means 3 for sampling the sample water from the drainage groove 2 specifically operates a water sampling pipe 12 having a water sampling port 11 at its tip and a vertical operation functioning as a lifting means for the water sampling pipe 12. A fluid pressure cylinder 13, a bellows type hose 14 that functions as a flexible or flexible piping means, a pipe 15 leading to a water sampling tank 4 described later, and a pipe 15.
And an on-off valve 16 provided on the way.

When the fluid pressure cylinder 13 is extended downward, the bellows-type hose 14 is extended, the water sampling pipe 12 is lowered in the direction of the arrow, and the water sampling port 11 is submerged below the liquid surface of the drain groove 2. When the fluid pressure cylinder 13 is shortened upward, the bellows type hose 14 contracts, the water sampling pipe 12 rises in the direction of the arrow, and the water sampling port 11 separates from the liquid surface of the drain groove 2. The bellows type hose 14 has a structure that can be removed while the water sampling pipe 12 and the pipe 15 are fixed, and the inspection and maintenance of the bellows type hose 14, the water sampling pipe 12 and the pipe 15 can be easily performed.

The water sampling tank 4 is a closed container having a bottom and a lid. A vacuum pump 5 is attached to the lid of the water sampling tank 4.
Is connected via a pipe 17 and an on-off valve 18,
The nitrogen cylinder 6 is connected to the pipe 19 via an opening / closing valve 20. In addition, by removing the upper lid of the water sampling tank 4, the internal inspection and maintenance can be easily performed. The vacuum pump 5, the pipe 17 and the open / close valve 18 constitute a fluid pressure reducing unit, and the nitrogen cylinder 6, the pipe 19 and the open / close valve 20 constitute a fluid pressure applying unit.

A level meter (sensor means) for adjusting the amount of the sample water stored in the water sampling tank 4 to a predetermined amount is attached to the lid. Further, a water sampling pipe 7 from the bottom of the water sampling tank 4 to the automatic water analyzer 1 is arranged, and the water sampling pipe 7 is provided with an opening / closing valve 23. Further, the drain pipe 8 from the main body 1 of the automatic water analyzer to the drain 2
Are arranged. The tip 22 of the pipe 15 in the water sampling means is arranged so as to open above the liquid level in the water sampling tank 4.

Such a water sampling tank 4 is installed at a position higher than the water automatic analyzer 1, and is caused not only by the pressurizing means described later but also by the height difference between the water sampling tank 4 and the water automatic analyzer 1. The head pressure is used to accelerate the supply of the sample water from the water sampling tank 4, and the pressing force of the pressurizing means is not so required.

The operation of the fluid pressure cylinder 13 described above, the turning on and off of the vacuum pump 5 (pressure reducing means), and the on-off valve 1
6, 18, 20, 23 are opened and closed by a control device (not shown). The control device sucks sample water into the water sampling tank 4 at a timing before the automatic water analyzer main body 1 operates, A procedure in which the sample water is supplied to the automatic water analyzer main body 1 at a timing, and each device is operated so that the sample water does not remain in the water sampling system after the measurement of the automatic water analyzer main body 1 (first to later-described The program in which the third step (see step 3) is written is incorporated. By this control device, the sample water sampling by the operation of the vacuum pump 5 as the depressurizing means and the sample water supply by the introduction of the pressure nitrogen in the nitrogen cylinder 6 as the pressurizing means are carried out at a predetermined timing in cooperation with each other. At any time, the sample water can be supplied to the water automatic analyzer body 1.

FIG. 2 shows an example of the equipment structure of an automatic water analyzer to which the water sampling system having the above-mentioned water sampling system is connected. An automatic water analyzer is configured to include an automatic water analyzer main body 1 having a built-in aeration tower, a water quality calculator 31, and a flow path switch 32. In the illustrated example, three water sampling pipes 7A,
7B and 7C are configured to be selectively connectable to the water automatic analyzer main body 1 via the flow path switch 32. Therefore, water sampling pipes 7A, 7 for sampling water from three predetermined locations
A water sampling system as shown in FIG. 1 can be connected to each of B and 7C. In addition, 33, 34, and 35 are 3-way switching valves, and the unused water sampling pipes 7A, 7B, and 7C are connected to the drain groove 2
It is configured to open to. As described above, the automatic water analyzer is composed of the devices after the dashed-dotted line in the figure, and the drain pipe 8 and the water sampling pipes 7A, 7B, 7C are connected as a part of the above-described sample water supply system.

Next, a sample water supply method using the above-described sample water supply system will be described in the order of steps. FIG.
In the initial stage, the water sampling port 11 is in the raised position, the water sampling means 3, the water sampling tank 4, and the water sampling pipe 7 are empty, and the nitrogen gas as the inert gas is filled. There is.

When the inevitable steps are roughly classified, a first step of collecting water into the water sampling tank, a second step of supplying sample water from the water sampling tank, and a water sampling system including a water sampling tank and the like. The third step is to replace the sample water with nitrogen gas as an inert gas to empty the sample water.

First Step (Water Collection Step) When the timing for operating the automatic water analyzer body 1 is reached, the fluid pressure cylinder 13 is extended and the water collection port 11 is submerged in the liquid surface of the drain groove 2. Then, the vacuum pump 5 is operated. At this time, the open / close valve 16 and the open / close valve 18 are opened, and the open / close valve 20 and the open / close valve 23 are closed. Then, the sample water in the drainage groove 2 is sucked up through the pipe 15 due to the pressure reduction in the tank of the vacuum pump 5, and the sample water overflows from the in-tank opening 22 of the pipe 15. When the liquid level gauge 21 provided in the water sampling tank 4 detects the sample water, the operation of the vacuum pump 5 is stopped and a predetermined amount of sample water is stored in the water sampling tank 4.

Second Step (Supply Step) Next, the on-off valve 20 is opened in order to pressurize the nitrogen (inert gas) from the nitrogen cylinder 6 at a predetermined pressure into the water sampling tank 4. At this time, the on-off valves 16 and 17 are closed,
The open / close valve 23 is opened. Then, the water sampling tank 4
The internal pressure rises, the sample water in the water sampling tank 4 is pushed out through the water sampling pipe 7, and is supplied to the automatic water analyzer 1. In order to gain this supply time to some extent, the water sampling tank 4 has a desired capacity. As described above, while the sample water is being supplied through the water sampling pipe 7, a predetermined measurement is performed by the automatic water analyzer 1.

Third step (step of pushing out sample water in the water sampling system and nitrogen substitution step) If the pressurization in the water sampling tank 4 is continued even after the measurement by the automatic water analyzer is completed, the remaining water in the water sampling tank 4 remains. The sample water is discharged to the drainage groove 2 through the water sampling pipe 7 and the drainage pipe 8, and at the same time, the insides of the water sampling tank 4, the water sampling pipe 7, the water automatic analyzer main body 1, and the drainage pipe 8 are replaced with nitrogen gas. To be done. In parallel with this drainage replacement work, the fluid pressure cylinder 13 is shortened to raise the water sampling port 11 above the liquid surface of the drainage groove 2. At the same time, when the opening / closing valve 16 is opened, the sample water remaining in the pipe 15, the bellows type hose 14 and the water sampling pipe 12 is discharged by the introduction of nitrogen gas and is replaced with nitrogen.

After the measurement by the automatic water analyzer is completed by the first to third steps, the sample water is collected in the water sampling means 3, the water sampling tank 4, the water sampling system 7, and the like. Remains and is filled with nitrogen gas. Therefore, the water sampling system becomes an empty state in which almost no sample water remains, and the generation of algae due to the sample water is prevented. Even if there is a small amount of sample water remaining in the water sampling system (those that adhere to the inner surface of the pipe), the nitrogen gas filling suppresses the growth of algae.

In the above description of the embodiment, the case where nitrogen gas is introduced as the pressurizing means has been described, but compressed air may be introduced. An air compressor or an in-plant air source can be used as the pressurizing means in this case. Further, the water sampling port which can be moved up and down in the sampling means is not limited to the combination of the fluid pressure cylinder 13 and the hose 14, and may have a structure in which the water sampling pipe is mechanically rocked, and which is soaked in or taken out from the water sampling groove. Further, as an alternative to the vacuum pump 5 as the pressure reducing means, a negative pressure by air suction may be used.

[0031]

EXAMPLES Specific examples of the embodiments of the present invention will be described with reference to tables. For factory wastewater, the system as in the conventional example of FIG. 3 is operated for 4 months (March to June), and the system is modified as in the embodiment of FIG. 1 for another 4 months (7
Table 1 shows the days when the plant was operated, and proper analysis could not be performed, and inspections and maintenance related to the generation of algae were performed and the number of times of such a month.

[0032]

[Table 1]

The inspection and maintenance, which was performed 16 times / 4 months in the conventional system shown in FIG. 3, is reduced to 3 times / 4 months in the embodiment shown in FIG. Further, in the embodiment shown in FIG. 1, it was found that even if algae were generated in the water sampling system, the proliferation had disappeared and inspection and maintenance were necessary, but the frequency was greatly reduced. Further, when the time required for one inspection and maintenance was compared, there was no great difference between the conventional system of FIG. 3 and the system of the present invention of FIG.

[0034]

As described above, according to the invention of claim 1 of the present invention, the sample water is sampled when necessary so that the sample water does not remain in the sample system after the analysis. Since it is a method that did not cause sample water to remain in the water collection system and algae propagate, it is possible to reduce the frequency of problems that impurities are mixed in the sample water and accurate analysis cannot be performed. Produce an effect. In addition, by providing a water sampling system having a water sampling tank, it is possible to reliably and easily supply or discharge the sample water only by depressurizing or pressurizing the inside of the water sampling tank.

The invention according to claim 2 has the effect of ensuring the algae growth inhibiting effect in the water sampling system, which is the effect of the invention according to claim 1, by replacing the inert gas. Further, by using the inert gas, it is possible to simultaneously discharge the sample water and push out oxygen for suppressing the generation of algae.

Since the invention described in claim 3 is a system in which the sample water can be supplied to the automatic water analyzer when necessary by repeatedly collecting water by the depressurizing means and supplying by the pressurizing means. The sample water can be prevented from remaining in the water sampling system, and the frequency of inspection and maintenance due to inaccurate analysis due to algae breeding in the water sampling system can be reduced. The simple equipment configuration of connecting the decompression means and the pressurization means to the water sampling tank has the effect of inspecting and maintaining the system in a short time. In other words, if the sample water originally contains algae and it is not possible to completely prevent the algae from mixing into the system, it is necessary to easily perform system inspection and maintenance. Even if the frequency of inspection and maintenance decreases, it takes time. But,
Due to the simple equipment configuration of the water sampling means that can be raised and lowered and the water sampling tank connected to the decompression means and pressurization means, the time required for inspection and maintenance can be comparable to the conventional continuous circulation system. . This is because the water sampling tank can be inspected and maintained by removing the lid, and the piping before and after the water sampling tank can be approximately the same as the piping before and after the conventional pump. A bellows type hose is added to the water sampling means, but it can be easily inspected and maintained by removing it.

According to the invention of claim 4, the effect of inhibiting the growth of algae in the water sampling system, which is the effect of the invention of claim 3, is ensured by the replacement of the inert gas carried out at the same time as the discharge of the sample water. Produce an effect. In addition, the pressurization and the inert gas purge are performed by the same pressurizing means, which has the effect of simplifying the device configuration.

[Brief description of drawings]

FIG. 1 is a device layout view of a sample water supply system applied to the method of the present invention.

FIG. 2 is a device configuration diagram showing an example of an automatic water analyzer.

FIG. 3 is a device layout view of a sample water supply system applied to a conventional method.

[Explanation of symbols]

 1 water automatic analyzer main body 2 drain groove 3 water sampling means 4 water sampling tank 5 vacuum pump (depressurizing means) 6 nitrogen tank (pressurizing means) 7 water sampling pipe 11 water sampling port 13 fluid pressure cylinder (means for freely moving the water sampling port) ) 14 Bellows-type hose (means for freely raising and lowering the water sampling port)

Claims (4)

[Claims] 1. A step of temporarily storing in a water sampling tank the sample water sucked up by sinking a water sampling port to the liquid surface, and supplying the sample water in the water sampling tank to an automatic water analyzer for analysis. And a step of raising the water sampling port from the liquid level and emptying the sample water in the water sampling system from the water sampling port to the water automatic analyzer via the water sampling tank, A sample water supply method for an automatic water analyzer, wherein sample water is sampled at times so that the sample water does not remain in the sampling system after analysis. 2. The method for supplying sample water to an automatic water analyzer according to claim 1, wherein the sample water in the water sampling system is replaced with an inert gas so that the sample water is emptied. 3. A water sampling means capable of raising and lowering a water sampling port with respect to a liquid surface, a water sampling tank for storing sample water from the water sampling device, and a water sampling port connected to the water sampling device. A decompression means for decompressing the inside of the water sampling tank to suck up the sample water when it is in a plane, and for supplying the sample water in the water sampling tank to the automatic water analyzer, the inside of the water sampling tank is A pressurizing means for pressurizing, wherein the sample water can be supplied to the water automatic analyzer when necessary by repeatedly collecting water by the depressurizing means and supplying by the pressurizing means. Sample water supply system for automatic water analyzer 4. The water automatic analyzer according to claim 1, wherein the pressurizing means press-fits an inert gas into the water sampling tank, and the water automatic analyzer is passed from the water sampling means through the water sampling tank. A sample water supply system for an automatic water analyzer, in which the sample water in the water collection system up to the above is drained by the replacement of the inert gas.