JPH0435840Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a waste liquid treatment device that mainly treats waste liquid containing radioactive substances, and more specifically, when draining water from the device after using the device, the water is removed. The present invention relates to a device configured so that waste liquid is not contained in the liquid that flows out due to draining.

[Technical background of the invention and its problems]

For example, cleaning fluid at nuclear power plants,
The waste liquid may contain radioactive substances. Conventionally, an apparatus for treating such waste liquid has been constructed as shown in FIG. That is, the main body 1 of the apparatus has a closed tank structure, and a partition wall 5 is provided inside the tank to separate an upper part and a lower part, thereby separating the tank into an upper chamber 2 and a lower chamber 14. A cylindrical filter 7 is provided in the lower chamber 14, and the inside of the filter 7 and the upper chamber 2 are
and are communicated by a guideway 8. And lower chamber 1
A waste liquid is introduced from the outside into the inside of the tank 4 through a waste liquid introduction pipe 11. Then, this waste liquid enters the inside of the filter from the outer periphery, is filtered during that time, becomes a processing liquid, reaches the upper chamber 2, and from there is passed through the processing liquid discharge pipe 12.
is discharged by Then, precipitates containing radioactive substances are sequentially deposited below the lower chamber 14. Thus, if the device is used until the processing capacity of the filter 7 is reached, then the waste liquid treatment is stopped. Then, compressed air is supplied through the waste liquid introduction pipe 11, and after the liquid accumulated in the apparatus is extracted from the drain pipe 13, the apparatus main body 1, including the filter 7, is stored as radioactive waste. However, when the water is drained as shown by the arrow in FIG. 2 after using the device, the drained liquid is untreated and contains radioactive materials. Therefore, it was necessary to separately process the untreated liquid itself, which was troublesome.

In addition, as a prior art, a processing device for high wire materials described in Japanese Patent Publication No. 55-48280 has a partition at the bottom of the processing device to divide the interior into an upper chamber and a lower chamber, and a plurality of filters in the upper chamber. is provided, and its lower end communicates with the lower chamber. All of the treated water filtered by the filter is guided to the lower chamber, and the treated liquid is discharged to the outside from the lower chamber.

However, when the processing apparatus is divided into an upper chamber and a pipe, and all the processing liquid is led to the lower chamber, the following problem arises. In other words, if precipitates containing radioactive materials gradually accumulate in the upper chamber, a large amount of waste liquid will enter the filter from the accumulated part, and the lower the filter, the more clogged it will become, and the overall processing capacity will be greatly reduced. be.

In addition, in such conventional processing equipment, since waste liquid tends to flow more toward the bottom of the filter near the lower chamber, radioactive materials that accumulate on the partitions are agitated and they are not deposited quietly below. This has the disadvantage of causing the filter to end its life more quickly.

[Means for solving problems]

Therefore, the purpose of the present invention is to provide a waste liquid treatment device in which the filter is unlikely to be clogged even if precipitates containing radioactive substances accumulate at the bottom of the device, and the processing capacity per unit time is permanently large. In order to achieve this purpose, we will adopt the following structure.

The waste liquid treatment device of the present invention includes a device main body 1 forming a liquid-tight tank, and a device body 1 that is provided vertically spaced apart from each other in the main body 1, and that the main body is separated into an upper chamber 2, an intermediate chamber 3, and a lower chamber 4 in a watertight manner. An upper partition wall 5 and a lower partition wall 6 are installed inside the intermediate chamber 3, and the inner surface side of the upper end communicates with the upper chamber 2 via the first processing liquid guide path 8, and the lower end is connected to the lower chamber 4. Only one filter 7 communicates with the second processing liquid guiding path 9, and the lower end thereof is located above the lower partition wall 6 and is installed in the intermediate chamber 2, and the inner surface side of the upper end is connected to the first processing liquid. A plurality of filters 7a communicate with the upper chamber 2 via a guide path 8, a processing liquid communication pipe 10 whose lower end opens into the lower chamber 4 and whose upper end communicates with the upper chamber 2, and the lower chamber 4. A drain pipe 13 communicating with the outside, a waste liquid guide pipe 11 communicating between the intermediate chamber 3 and the outside of the main body 1, and a processing liquid discharge pipe 12 communicating between the upper chamber 2 and the outside,
The fluid resistance of the second processing liquid guide path 9 of the only filter is formed to be larger than the fluid resistance of the first processing liquid guide path 8, so that most of the processing liquid is transferred by the filter. It is characterized in that it is configured to pass through the first treatment liquid guiding path 8.

[Example of idea]

Next, one embodiment of the present invention will be described based on the drawings.

FIG. 3 is an explanatory longitudinal cross-sectional view showing the principle of the present apparatus, and shows the state during waste liquid treatment. Moreover, FIG. 4 shows a state in which water is drained after using the apparatus. As is clear from FIG. 3, in this apparatus, the interior of the apparatus main body 1 is divided into three rooms by an upper partition wall 5 and a lower partition wall 6 which are vertically spaced apart. That is, it is divided into an upper chamber 2, an intermediate chamber 3, and a lower chamber 4, and the outside and upper chamber 2 are provided with a processing liquid discharge pipe 12, and the intermediate chamber is provided with a waste liquid introduction pipe 1.
1 and a drain pipe 13 is provided in the lower chamber. A processing liquid communication pipe 1 is connected between the upper chamber 2 and the lower chamber 4.
Connect with 0. Further, a cylindrical center filter 7 is provided at the center of the intermediate chamber, and a cylindrical peripheral edge filter 7a is provided at the periphery thereof. The insides of the respective filters 7 and 7a are communicated with the upper chamber 2 through a first processing liquid guiding path 8. At the same time, the inner side of the lower end of the central filter 7 and the lower chamber 4 are communicated through a second processing liquid guiding path 9. Note that the flow path resistance of the second processing liquid communication path 9 is formed to be larger than the guide path resistance of the first processing liquid guide path 8. Therefore, most of the processing liquid passes through the first processing liquid guiding path 8.

Next, FIGS. 5 to 7 show embodiments embodying the principle shown in FIG. 3. That is, FIG. 5 is a longitudinal sectional view of this embodiment, FIG. 6 is a longitudinal sectional view showing the lower end portion of the drain pipe 13, and FIG. 7 is a plan view of the same embodiment. In this embodiment, six peripheral filters 7a are arranged around a central filter 7 as shown in FIG. The device main body 1 is formed into a double container, into which lead 18 is filled as a radiation shielding material, and an upper lid 19 also containing lead is removably fitted. The apparatus main body 1 is held at the center of the drum can 17 by various supports 25.

[Effect of invention]

Next, the operation of the present invention will be explained based on the principle diagrams shown in FIGS. 3 and 4.

First, in order to treat the waste liquid, the drain pipe 13 is closed off using the stopper 16 or the like at the upper end of the drain pipe 13. Then, a waste liquid containing a radioactive substance is introduced into the intermediate chamber 3 from the waste liquid introduction pipe 11 as shown by the arrow. Then, the waste liquid enters the center filter 7 and the peripheral filter 7a from their outer peripheries, is filtered, becomes a processing liquid, and directly reaches the upper chamber 2 via the first processing liquid guide path 8. Then, the processing liquid is discharged from the upper chamber 2 to the outside through the processing liquid discharge pipe 12. Further, the processing liquid flows from the lower end of the central filter 7 to the second processing liquid guide path 9.
It passes through and reaches the lower chamber 4. Note that this second processing liquid guide path 9 has a relatively large flow path resistance, so the flow rate from this path is relatively small. The processing liquid that has reached the lower chamber 4 passes through the processing liquid communication pipe 10 and reaches the upper chamber 2, and is discharged to the outside through the processing liquid discharge pipe 12.

Next, after using this device, the processing liquid discharge pipe 12
A plug 16 is fitted into the opening. In addition, in reality,
As shown in FIG. 5, a coupler 24 is provided at the upper end for discharging the processing liquid. And the discharge pipe 1
2 and a hose (not shown), the discharge pipe 12 is automatically closed. Next, compressed air is supplied from the waste liquid introduction pipe 11. Then, the compressed air causes the untreated water in the middle chamber 3 to pass through the central filter 7 and reach the lower chamber 4 after being filtered. Then, the treated liquid is sequentially discharged from the drain pipe 13, and the treated water in the upper chamber 2 passes through the treated liquid communication pipe 10 and flows down to the lower chamber 4. Thus, all the liquid flowing out from the drain pipe 13 becomes treated water and is discharged.

[Effects of the invention] The waste liquid treatment device of the present invention has a plurality of filters 7 located above the lower partition wall 6 and arranged in the intermediate chamber 3, so that the precipitate containing radioactive substances is not deposited on the lower partition wall 6. Even if substances gradually accumulate, clogging is unlikely to occur because the waste liquid is introduced into the filter 7 from above. In addition, in the case of only one filter 7, since the fluid resistance of the second processing liquid guide path 9 is formed to be larger than that of the first processing liquid guide path 8,
Waste liquid treatment is performed more in the upper part near the treatment liquid guiding path 8, and clogging is less likely to occur even in only one filter 7. Therefore, the processing capacity per unit time can be permanently increased. Only a relatively small amount of processing liquid is then led to the lower chamber.
Therefore, it is possible to suppress as much as possible the dust settled in the lower part of the intermediate chamber 3 from entering the lower chamber. This has the effect of significantly reducing the amount of untreated substances in treated water. Further, since the dust with relatively high specific gravity in the waste liquid can be quietly settled below the relatively wide intermediate chamber, it is possible to provide an apparatus with high filtration effect.

Moreover, after using this treatment equipment, the water drain pipe 1
Since the liquid discharged from 3 has already been treated, it has the effect of being able to be discharged to an appropriate location.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a conventional waste liquid treatment device, showing the waste liquid treatment state, Fig. 2 shows the state when water is drained, and Fig. 3 is a diagram showing the principle of the waste liquid treatment device of the present invention. FIG. 4 is a vertical cross-sectional explanatory view showing a state of waste liquid treatment, and FIG. 4 shows a state of the same apparatus when water is drained. FIG. 5 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 6 is a longitudinal sectional view showing the lower part of the drain pipe 13 of the same device, and FIG. 7 is a plan view of the embodiment. DESCRIPTION OF SYMBOLS 1...Device main body, 2...Upper chamber, 3...Middle chamber, 4, 14...Lower chamber, 5...Upper partition, 6...
...Lower partition wall, 7...Filter, 8...First processing liquid guide path, 9...Second processing liquid guide path, 10...Processing liquid communication pipe, 11...Waste liquid introduction pipe, 12...Processing liquid discharge Pipe, 13... Water drain pipe, 15... Liquid level, 16...
...Bung, 17...Drum can, 18...Lead, 19...
Upper lid, 20...locking tool, 22, 23, 24...coupler, 25...support body.

Claims (1)

[Scope of utility model registration request] A device main body 1 forming a liquid-tight tank, and the main body 1
An upper partition wall 5 and a lower partition wall 6 are provided vertically apart from each other in the interior and watertightly partition the main body into an upper chamber 2, an intermediate chamber 3, and a lower chamber 4; Only one filter 7 whose lower end communicates with the upper chamber 2 via a first processing liquid guide path 8 and whose lower end communicates with the lower chamber 4 via a second processing liquid guide path 9; A plurality of filters 7 are located above the lower partition wall 6 and are installed in the intermediate chamber 2, and the inner surface side of the upper end communicates with the upper chamber 2 via the first processing liquid guiding path 8.
a, a processing liquid communication pipe 10 whose lower end opens to the lower chamber 4 and whose upper end communicates with the upper chamber 2; a drain pipe 13 which communicates the lower chamber 4 with the outside; and the intermediate chamber 3 and the The second processing liquid guide path 9 of the only filter includes a waste liquid introduction pipe 11 communicating with the outside of the main body 1 and a processing liquid discharge pipe 12 communicating the upper chamber 2 with the outside. The fluid resistance of the filter is larger than the fluid resistance of the first processing liquid guiding path 8, so that most of the processing liquid from the filter passes through the first processing liquid guiding path 8. waste liquid treatment equipment.