JPH01171611A - Device for treating liquid sample - Google Patents

Abstract

PURPOSE:To obtain the title device capable of filtering a prescribed amt. of a liq. sample by providing a liq. level detector and a pressure controller in the primary chamber of a filter vessel for filtering the liq. sample. CONSTITUTION:A filter 4 for filtering the liq. sample 3 is incorporated in the filter vessel 2 of the liq. sample treating device 1. The primary chamber 2a for receiving the liq. sample 3 is placed on the inner wall side of the filter 4, and a secondary chamber 2b is provided on the outer wall side of the filter 4. The pressure controller and the liq. level detector 24 are connected to the upper end of the primary chamber 2a. The primary chamber 2a is evacuated by the pressure controller, and the liq. sample is sucked. The face that the amt. of the liq. sample introduced into the primary chamber 2a reaches a specified value is detected by the liq. level detector 24. The primary chamber 2a is then pressurized by the pressure controller, and a prescribed amt. of the liq. sample can be filtered into the secondary chamber.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a sampling liquid processing device used when collecting contaminated water or the like.

(Prior Art) Conventionally, when measuring the degree of contamination of domestic wastewater or wastewater used for chemical treatment, etc., a predetermined amount of the contaminated water is taken as a sample liquid, and the sample liquid is analyzed.

However, since the sample liquid contains foreign substances such as solids, it is necessary to filter it. An example of such a device is shown in FIG. The filter container 2 of this sampling liquid processing device 1 includes a filter 4 for filtering the sample liquid 3.
is built-in. The filter 4 is made of a porous material, and the upper and lower ends of the filter 4 are in close contact with the upper and lower inner walls of the filter container 2 . The inner wall side of the filter 4 is a primary chamber 2a into which the sample liquid 3 flows, and between the outer wall side of the filter 4 and the inner wall of the filter container 2, the sample liquid 3 permeates through the filter 4, is filtered, and then flows out. Secondary room 2
It is b. The lower end of the filter container 2 is connected to the discharge side of a sampling pump 6 through a pipe 5, and the suction side of the sampling pump 6 is connected to the outlet side of the strainer body 7.

A strainer 8 is built into the strainer body 7 to prevent coarse foreign matter contained in the sample liquid 3. A collection pipe 9 is connected to the inflow side of the strainer body 7, and the tip of the collection pipe 9 is below the surface of the contaminated water 1o. A return pipe 11 is connected to the upper end of the filter container 2, and the sample liquid 3 is returned to the tank 12. The suction side of a supply pump 13 is connected to the secondary chamber 2b of the filter container 2 through a pipe 5.
The discharge side of No. 3 is connected to an analyzer 14. With such a configuration, when the sampling pump 6 is operated, the sample liquid 3 passes through the sampling tube 9, and the strainer 8 prevents foreign substances from passing through. Then, the sample liquid 3 is in the primary chamber 2a.
Most of the sample liquid 3 passes through the return pipe 11 and returns to the tank 1.
Return to 2. When the sample liquid 3 passes through the primary chamber 2a of the filter container 2, part of the sample liquid 3 is filtered by the filter 4 and flows out into the secondary chamber 2b. A predetermined amount of the filtered sample liquid 3 is supplied to the analyzer 14 by the operation of the supply pump 13 .

In the above description, the contaminated water that accumulated in the tank 12 was referred to as the contaminated water 10, and the water that flowed in from the collection tube 9 and was supplied to the analyzer 14 was referred to as the sample liquid 3. The same applies to the following explanation.

(Problem to be Solved by the Invention) However, in the conventional configuration as described above, the sample liquid flows from the collection tube into the primary chamber of the filter container, and most of the sample liquid returns to the tank from the return tube. It looks like this.

During this time, a part of the sample liquid permeates the filter, and after being filtered, it flows out into the secondary chamber. At this time, the pressure of the sample liquid discharged from the sampling pump somewhat accelerates the penetration of the sample liquid into the filter, but since the sample liquid is circulating, the sample liquid permeates the filter and flows out into the secondary chamber. It takes a long time. Furthermore, in order to supply a fixed amount of sample liquid to the analyzer, it is necessary to operate the supply pump as a metering pump or to measure the inflow amount of the sample liquid on the analyzer side.

Furthermore, since the filter container is easily clogged with foreign matter, the sampling pump and filter container must be frequently removed and cleaned, resulting in frequent maintenance, resulting in a device with poor operating efficiency.

The present invention has been made in order to solve the above-mentioned problems, and it improves the maintainability of the equipment for collecting the sample liquid, collects a predetermined amount of the sample liquid in a stable state, and improves the filtration efficiency of the sample liquid. It is an object of the present invention to provide a sampling liquid processing device that can shorten the time.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention includes a filter for filtering a sample liquid, and a primary chamber that includes this filter and is partitioned by this filter and into which the sample liquid flows. and a filter container having a secondary chamber from which the filtered sample liquid flows out, a liquid level detector installed in the primary chamber of the filter container to detect a predetermined amount of the sample liquid, and a liquid level detector connected to the primary chamber of the filter container. and a pressure control device that changes the internal pressure of the filter container.

(Function) In the sampling liquid processing device configured as described above, first, the inside of the filter container is made negative or positive by activating the pressure control device. When the inside of the filter container becomes negative pressure, the sample liquid flows into the primary chamber in the filter container. - It is detected by the liquid level detector that the sample liquid that has flowed into the charcoal chamber has reached a predetermined amount. Next, the inside of the filter container is made to have a positive pressure by activating the pressure control device. When the inside of the filter container becomes positive pressure, the sample liquid is filtered by the filter and flows out into the secondary chamber of the filter container.

(Example) Examples of the present invention will be described below based on the drawings. 1st
The figure shows an embodiment of the sampling liquid processing apparatus of the present invention. This sampling liquid processing device 1 has the same structure as that already explained in the section of the prior art with reference to FIG. The same configurations are designated by the same reference numerals, and detailed description thereof will be omitted. The filter 4 built into the filter container 2 is made of a porous material, such as a ceramic filter. Firebox 2a of filter container 2
A pipe 5 is connected to the lower end of the filter container 2, and this pipe 5 is branched. One branched pipe 5 is connected to the outflow side of the sampling valve 15, and the pipe 5 connected to the inflow side of the sampling valve 15 is connected to the outflow side of the strainer body 7. A collection pipe 9 is connected to the inflow side of the strainer body 7, and the tip of the collection pipe 9 is below the surface of the contaminated water 10. The other branched pipe 5 of the pipes 5 connected to the lower end of the filter container 2 is connected to the inflow side of the first drain valve 16, and the pipe 5 connected to the outflow side of the first drain valve 16 is connected to the next pipe 5. It is connected to a drain pipe 18 connected to the outflow side of the second drain valve 17 described in . Second drain valve 1
The inflow side of 7 is connected to the secondary chamber 2b of the filter container 2 through the pipe 5.
It is connected to the. The primary fire chamber 2a of the filter container 2 is higher than the upper end surface of the secondary chamber 2b and has a relatively large capacity in order to allow a large amount of sample liquid 3 to flow therein.

A pressure control device is connected to the upper end of the secondary chamber 2b of the filter container 2.

This pressure control device will be explained. First, an air pipe 19 is connected to the upper end of the filter container 2 . An air release valve 20 is connected to the terminal end of this air pipe 19, and by opening the air release valve 20, the inside of the filter container 2 is brought to atmospheric pressure. The air pipe 19 in front of the air release valve 20 is
It is branched into one other air pipe, and this air pipe 19 is
Furthermore, it is branched into another air pipe 19. One of the air pipes 19 is connected to the inflow side of a three-way air intake switching valve 21, and the other air pipe 20 is connected to the outflow side of a three-way air exhaust switching valve 22. The outflow side of the intake switching valve 21 is connected to the suction side of the air pump 23. The discharge side of the air pump 23 is connected to the inflow side of the air removal switching valve 22 described above.

Further, a liquid level detector 24 is attached to the upper end of the secondary chamber 2b of the filter container 2, and the liquid level detector 24 detects when the sample liquid 3 flowing into the secondary chamber 2b reaches a predetermined liquid level. Detects the liquid level and outputs a signal.

The inflow rate at which the sample liquid 3 flows into the primary fire chamber 2a of the filter container 2 is sufficiently faster than the rate at which the sample liquid 3 permeates the filter 4 and flows out into the secondary chamber 2b. The liquid level detector 24 detects a predetermined amount of the sample liquid 3 without being affected by the speed at which it flows out.

The primary fire chamber 2a and secondary chamber 2b of the filter container 2 are each provided with a cleaning water supply valve 25a as a cleaning device.

25b are connected to these wash water supply valves 25a.

The inlet side of 25b is connected to a cleaning water source. Further, a supply pipe 26 is connected to the secondary chamber 2b of the filter container 2, this supply pipe 26 is connected to the inflow side of a supply valve 27, and the supply pipe 26 connected to the outflow side of the supply valve 27 is connected to the secondary chamber 2b of the filter container 2. It is connected to the suction side of the supply pump 13. A supply pipe 26 connected to the discharge side of the supply pump 13 is connected to the analyzer 14.

The operation of the sampling liquid processing apparatus 1 configured as described above will be explained.

When collecting the sample liquid 3 from the contaminated water 10, first, a control device (not shown) puts the air removal switching valve 22 into the air removal state as shown by arrow B, and shuts off the direction of arrow A. the supply valve 27 is closed, both wash water supply valves 25a and 25b are closed, the first drain valve 16 and second drain valve 17 are closed, and the air release valve 20 is closed. ,
Then, the sampling valve 15 is opened, and the intake switching valve 21 is switched to a non-intake state in the direction shown by the arrow and a state in which air is communicated in the direction shown by the arrow C.

Next, when the air pump 23 is operated, the pressure inside the filter container 2 is reduced relative to the atmospheric pressure.

When the pressure inside the filter container 2 is reduced, the sample liquid 3 passes through the collection tube 9, and the passage of coarse foreign matter contained in the sample liquid 3 is prevented by the strainer 8 in the strainer body 7. After passing through the sampling valve 15, the sample liquid 3 flows into the first fire chamber 2a of the filter container 2.

Due to this inflow of the sample liquid 3, the sample liquid 3 begins to permeate into the filter 4 little by little, but the permeation is slow.

Therefore, the liquid level of the sample liquid 3 in the primary chamber 2a rises, and when this liquid level reaches a predetermined height, the liquid level detector 24 detects the liquid level. When the liquid level detector 24 detects the liquid level, it outputs a signal, and this signal is transmitted to the control device. The controller stops the operation of the air pump 23 and closes the sampling valve 1.
5 is closed, and the intake switching valve 21 is switched to a state where no air is taken in the direction of the arrow and a state where the direction of the arrow C is blocked. Furthermore, by opening the air release valve 20, the inside of the filter container 2 is brought to atmospheric pressure. In this way, a predetermined amount of sample liquid 3 is collected.

Next, when filtering the sample liquid 3, switch the air removal switching valve 22 to the state shown by arrow B so that air is not removed, and to the state where it communicates in the direction shown by arrow A, and both wash water supply valves 25a
, 25b, the first drain valve 16, and the second drain valve 17 remain closed, the air release valve 20 is closed, the sampling valve 15 is closed, and the intake switching valve 21 is turned in the direction of the arrow. Switch to a state in which air is taken in as shown, and a state in which the direction of arrow C is blocked. Next, when the air pump 23 is operated, the inside of the filter container 2 is pressurized. By being pressurized, a predetermined amount of the sample liquid 3 in the primary chamber 2a of the filter container 2 permeates through the filter 4 and is filtered. This filtration rate is increased by pressurizing the filter container 2.

The filtered sample liquid 3 accumulates in the secondary chamber 2b of the filter container 2, and when the sample liquid 3 accumulates, the supply valve 27 is opened, and the supply pump 13 is operated. It is supplied to the analyzer 14.

Although the supply pump 13 is operated when supplying the sample liquid 3 to the analyzer 14 as described above, this supply pump 13 is not used, and the sample liquid 3 is filtered by pressurizing the air pump 23. It is also possible to send the sample under pressure to the analyzer 14 at the same time.

Next, strainer 8 and filter 4 inside strainer body 7
When cleaning the filter container 2, first clean the filter container 2 as described above.
After storing the sample liquid 3 in the secondary chamber 2b of The second drain valve 17 is closed, the ventilation switching valve 22 is switched to a state in which air is not vented in the direction shown by arrow B, and to a state in which air is communicated in the direction shown by arrow A. is switched to a state in which air is taken in in the direction shown by arrow C, and to a state in which air is shut off in the direction shown by arrow C. Next, sampling valve 1
5 is opened and the air pump 23 is operated, the inside of the filter container 2 is pressurized, so that the sample liquid 3 accumulated in the secondary chamber 2b of the filter container 2 cleans the strainer 8. The coarse foreign matter accumulated in the strainer 8 flows out from the collection tube 9 into the tank 12. Furthermore, by opening the cleaning water supply valve 25b and supplying cleaning water to the secondary chamber 2b, the filter 4 is cleaned, and by passing this cleaning water through the strainer 8, the strainer 8 is also cleaned. If this wash water cannot be allowed to flow into the tank, the sampling valve 15 is closed and the first drain valve 16 is opened to allow the wash water to flow from the drain pipe 18 to the drain side.

Next, both cleaning water supply valves 25a and 25b are opened, cleaning water is supplied to the primary chamber 2a and secondary chamber 2b of the filter container 2, and the filter 4 is cleaned by pressurizing the inside of the filter container 2. Ru. At this time, the first drain valve 16 and the second
When the drain valve 17 is opened, the wash water flows to the drain side.

In addition to the cleaning function described above, when the sampling liquid processing device 1 is in a rest state, both the cleaning water supply valves 25a and 25b are opened, and a liquid level detector 24 is installed inside the filter container 2. Collect enough cleaning water to detect it. This cleaning water prevents foreign matter from drying and clogging the filter 4. When restarting the operation, the first drain valve 16 and the second drain valve 17 are opened to allow the cleaning water in the filter container 2 to flow to the drain side.

By providing the filter container 2 with a cleaning function in this way, the frequency of maintenance such as disassembly and cleaning can be reduced.

〔Effect of the invention〕

As described above, in the sampling liquid processing device according to the present invention, a predetermined amount of sample liquid can be stored by providing a liquid level detector in the primary chamber of the filter container, so expensive equipment such as a metering pump is not required. Therefore, maintainability is improved accordingly. Since the pump is not used when collecting the sample liquid, pump failures caused by foreign objects as in the past are eliminated, the number of maintenance operations is reduced, and the operating rate is improved. Further, by changing the pressure inside the filter container, permeation of a predetermined amount of sample liquid through the filter is promoted, so that the filtration time is shortened compared to the conventional filtration time, and the filtration ability is improved. Furthermore, since the sample liquid can be caused to flow into the primary chamber by changing the pressure inside the filter container, the sample liquid flows smoothly and the liquid level of the sample liquid detected by the liquid level detector becomes stable.

As a result, a device with improved filtration processing capacity was realized.

[Brief explanation of the drawing]

FIG. 1 is an equipment configuration diagram showing a sampling liquid processing apparatus of the present invention, and FIG. 2 is an equipment configuration diagram showing a conventional sampling liquid processing apparatus. DESCRIPTION OF SYMBOLS 1...Sampling liquid processing device, 2...Filter container, 2a...-Evening sky, 2b...Secondary chamber, 3...
Sample liquid, 4...Filter, 20, 21, 22.23.
...Pressure control device (air release valve, intake switching valve, air release switching valve, air pump), 24...Liquid level detector, 25a
. 25b... Washing device (washing water supply valve). Applicant's agent Mr. Sato

Claims (1)

[Claims] 1. A filter for filtering a sample liquid, a primary chamber containing this filter and partitioned by the filter into which the sample liquid flows, and a secondary chamber into which the filtered sample liquid flows out. a filter container having a chamber; a liquid level detector provided in a primary chamber of the filter container to detect a predetermined amount of the sample liquid; A sampling liquid processing device characterized by comprising a pressure control device for changing the pressure. 2. The sampling liquid processing device according to claim 1, wherein the filter container includes a cleaning device connected to the primary chamber and the secondary chamber.