JP2014089102A - Contaminant treatment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contaminant treatment device for certainly removing a radioactive material from sludge or contaminated water containing the radioactive material such as cesium.SOLUTION: The contaminant treatment device includes: a high temperature dryer (10) having a function of heating the inside to a predetermined temperature (for example, 900°C); a cyclone (30) that is communicated with an exhaust port (10ax) of the high temperature dryer (10), and has a function of cooling the exhaust gas of the high temperature dryer (10) and a function of separating the exhaust gas of the high temperature dryer (10) into a solid (fly ash, dust, particle containing cesium) and gas (containing vaporized cesium); an exhaust gas cleaning device (70) having a function of making the gas separated by the cyclone (30) flow in water; and a water treatment mechanism (DVW) having a coagulation/sedimentation tank (140).

Description

  The present invention relates to a contaminant treatment apparatus that removes a radioactive substance from soil, sludge, etc. contaminated with a radioactive substance such as cesium.

In a reservoir, fire prevention water tank, sewage treatment facility, etc., for example, sludge containing radioactive substances such as cesium is difficult to treat with conventional techniques because of its high radiation dose and high risk of exposure to employees.
Further, in the sludge, there are substances that float in the lower layer as floating mud by combining colloidal fine particles and floating substances taken into algae and other plants.
The treatment of such suspended mud (sludge containing radioactive substances such as cesium) is also difficult with conventional techniques.

In addition, the contaminated water in the lower layer (so-called “radioactive contaminated water”) in reservoirs, fire prevention water tanks, sewage treatment facilities, etc. is also high in radiation dose, and there is a high risk of exposure to workers engaged in treatment work.
For this reason, it is difficult to treat the water in the lower layer with the prior art.

As another conventional technique, for example, there is a spent fuel reprocessing technique (see, for example, Patent Document 1).
However, it is difficult to apply the related art (Patent Document 1) to the treatment of sludge and contaminated water contaminated with radioactive substances as described above.

JP 2012-93283 A

  The present invention has been proposed in view of the above-described problems of the prior art, and without increasing the exposure risk of workers engaged in processing operations, for example, sludge and contaminated water containing radioactive substances such as cesium. Therefore, an object of the present invention is to provide a pollutant treatment apparatus that reliably removes the radioactive substances.

The contaminant treatment apparatus of the present invention includes a high-temperature drying apparatus (10) having a function of heating the inside to a predetermined temperature (for example, 900 ° C.),
It communicates with the exhaust port (10ax) of the high-temperature drying device (10) and cools the exhaust of the high-temperature drying device (10), and the exhaust of the high-temperature drying device (10) is solid (fly ash, dust, cesium A cyclone (30) having a function of separating particles (including particles) and gas (including vaporized cesium);
An exhaust cleaning device (70) having a function of allowing the gas separated by the cyclone (30) to flow into water;
It is provided with a water treatment mechanism (roughing raw water tank 80, primary agitation reaction tank 90, secondary agitation reaction tank 110, fluid moving pressure pump 130, agglomeration precipitation tank 140) provided with a coagulation sedimentation tank (140). It is said.

  In the present invention, the water treatment mechanism (coarse water tank 80, primary stirring reaction tank 90, secondary stirring reaction tank 110, fluid moving pressure pump 130, and coagulating sedimentation tank 140) provided with the coagulation sedimentation tank (140) is exhausted. It is preferable to treat the water discharged from the cleaning device (70).

  Or in this invention, the solid-liquid separator (160) which carries out solid-liquid separation of the deposit of a coagulation sedimentation tank (140) is provided, and the solid isolate | separated with the solid-liquid separator (160) is made into a high temperature drying apparatus (10). It is preferable to provide a feeding device (quantitative supply screw conveyor 9: a double screw having shielding properties).

According to the present invention having the above-described configuration, since the sludge is heated to about 900 ° C. by the high-temperature drying device (10), cesium is vaporized and completely separated from the sludge. Therefore, cesium is not included in the solid matter discharged from the high-temperature drying apparatus (10).
Therefore, the solid matter discharged from the high-temperature drying device (10) can be embedded (if the radiation dose is equal to or less than a predetermined reference value).

Fly ash, dust, and vaporized cesium in the high-temperature drying apparatus (10) are cooled by the cyclone (30) and separated into solid and gas.
The solid separated by the cyclone (30) is subjected to stabilization treatment (for example, a treatment for adding a sodium silicate aqueous solution and a phosphoric acid aqueous solution to solidify it into a glass), and then storing it in a dedicated shielding container (5). I can do it.
On the other hand, when the gas separated by the cyclone moves in water in the exhaust gas cleaning device (70), cesium is collected by the water and removed from the gas. Therefore, the gas passing through water is cleaned.

Here, the water in which the cesium was collected by the exhaust gas cleaning device (70) is a water treatment mechanism including the coagulation sedimentation tank (140) (raw rough water tank 80, primary stirring reaction tank 90, secondary stirring reaction tank 110, When configured to be supplied to the fluid moving pump 130 and the coagulation sedimentation tank 140), the sludge containing cesium in the water is coagulated and precipitated in the coagulation sedimentation tank (140).
And the deposit of a coagulation sedimentation tank (140) is isolate | separated into a solid and a liquid with a solid-liquid separator (160), and the separated solid is stabilized with a processing equipment (not shown).
Further, the supernatant liquid of the coagulation sedimentation tank (140) and the liquid separated by the solid-liquid separator (160) are used as exhaust cleaning water in the exhaust cleaning device (70), or a processing facility (not shown). ) Can be stabilized.

That is, according to the present invention, the sludge containing a radioactive substance (for example, cesium) is separated into solid, gas, and liquid, and the radioactive substance (for example, cesium) is completely removed from each to thereby remove the radioactive substance from the sludge. Material (eg cesium) is removed.
And since all the processes to remove radioactive substances (eg cesium) from the sludge can be performed in a closed system, the sludge contaminated with high-concentration radioactive substances can be processed without being exposed to the workers. I can do it.

Moreover, in this invention, the solid-liquid separator (160) which carries out solid-liquid separation of the deposit of a coagulation sedimentation tank (140) is provided, and the solid isolate | separated by the solid-liquid separator (160) is thrown into a high temperature drying apparatus (10). When a conveying device (quantitative supply screw conveyor 9) is provided, first, sludge and contaminated water are treated with a water treatment mechanism (roughing raw water tank 80, primary stirring reaction tank 90, secondary stirring reaction tank 110, fluid moving pressure feed). The pump 130 and the coagulation sedimentation tank 140) are supplied and separated into the precipitate and the supernatant in the coagulation sedimentation tank (140).
And the deposit of a coagulation sedimentation tank (140) is isolate | separated into a solid and a liquid with a solid-liquid separator (160), and the isolate | separated solid is heated to about 900 degreeC with a high temperature drying apparatus (10). Thereby, the said solid is isolate | separated into the solid which cesium vaporized and isolate | separated, and fly ash, dust, and vaporized cesium.
The fly ash, dust, and vaporized cesium are cooled in a cyclone (30) and separated into a solid and a gas, and the solid separated in the cyclone (30) is stabilized (for example, sodium silicate aqueous solution and phosphoric acid aqueous solution). Can be stored in a dedicated shielding container (5). The gas separated by the cyclone (30) can be removed from the gas as cesium is collected by the water when moving in the water in the exhaust cleaning device (70).

On the other hand, in the coagulation sedimentation tank (140), cesium is almost precipitated, and the content in the supernatant is very small. Then, the supernatant and the liquid separated by the solid-liquid separator (160) can be reused without being taken out of the processing apparatus of the present invention.
As a result, radioactive substances such as cesium can be removed from sludge and contaminated water without diffusing.

1 is a block diagram showing a first embodiment of the present invention. It is a block diagram which shows the principal part of 1st Embodiment. It is a block diagram which shows the water treatment system | strain in 1st Embodiment. It is a block diagram which shows the principal part in the modification of 1st Embodiment. It is a block diagram which shows 2nd Embodiment of this invention.

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the illustrated embodiment, cesium is exemplified as the radioactive substance.
First, a first embodiment will be described with reference to FIGS.
In FIG. 1, the pollutant treatment apparatus generally indicated by reference numeral 1 includes a high-temperature drying apparatus 10, a post-treatment water retention kneader 20, a cyclone 30, a cyclone treatment kneader 40, and a stabilization treatment kneader 50. And a cooling heat exchanger HX, a heat exchange flue 60, an exhaust cleaning device 70, and a water treatment mechanism DVW.

The details of the high-temperature drying device 10, the post-treatment water retention kneader 20, the cyclone 30, the kneader 40 after the cyclone treatment, the stabilization kneader 50, and the exhaust cleaning device 70 are shown in FIG. Yes.
In FIG. 2, a high-temperature drying apparatus 10 includes a cylindrical casing 11, an input screw 12 communicating with a processing object input port (not shown), a drum screen 13, a drum screen rotating shaft 14, and a drum drive motor 10M. And a rotational force transmission mechanism 15.
In the high-temperature drying apparatus 10, the cylindrical casing 11, the charging screw 12, the drum screen 13, and the drum screen rotating shaft 14 all have horizontal axes extending in the horizontal direction.

A high-temperature burner 10B is attached to the end plate 11e of the cylindrical casing 11, and the high-temperature burner 10B is a treated product in the drum screen 13 (sludge including contaminants contaminated with radioactive substances such as cesium). Is heating up. Although not clearly shown, the high temperature burner 10B is configured to be switchable between a high temperature operation and a low temperature operation.
In the high-temperature drying apparatus 10, a fixed quantity supply screw conveyor 9 is connected to a workpiece input port (not shown).
As shown in FIG. 1, the high-temperature drying apparatus 10 is provided with a pressure sensor SR that measures the pressure inside the casing 11. The pressure sensor SR is connected to the control computer 300 via the input signal line Si. The control computer 300 is connected to the blower driving motor 70M by a control signal sign So, and is thus configured to control the rotation speed of the motor 70M in accordance with the pressure inside the casing 11. .

In FIG. 2, the fixed amount supply screw conveyor 9 includes an input port 91, a cylindrical casing 92, a screw conveyor main body 93, and a drive motor 94 that rotationally drives the screw conveyor main body 93.
In the fixed amount supply screw conveyor 9, the central axis of the cylindrical casing 92, the screw conveyor body 93, and the drive motor 94 all extend horizontally. Here, it is preferable that the fixed supply screw conveyor 9 is configured as a double screw having a shielding property in order to prevent the worker from being exposed to radiation.
In FIG. 1, the code | symbol 8 is the conveyance apparatus (Sewage sludge, sludge etc. which were stored in the bottom of a pond or a fire prevention water tank) and soil contaminated with cesium etc. to the inlet 91 of the fixed supply screw conveyor 9 (for example). For example, a cart or a belt conveyor) is shown.

In FIG. 2, the high-temperature drying device 10 is provided with a gas discharge port 10 ax in the vertical direction near the rear end (right end in FIG. 2) of the cylindrical casing 11. The gas discharge port 10ax is connected to the heat exchanger HX.
Further, in the vicinity of the rear end of the cylindrical casing 11, a solid matter discharge pipe 10b for discharging solid matter is provided below the gas discharge port 10ax in the vertical direction. The solid matter discharge pipe 10b communicates with the discharge port 10bx via the first on-off valve V1. The solid matter discharge port 10bx is connected to the input port 21i of the post-treatment water retention kneader 20 through the second on-off valve V2.

A first level sensor SR1 is mounted in the solid material discharge pipe 10b, and a second level sensor SR2 is mounted in the solid material discharge port 10bx.
In the solid discharge pipe 10b, when solid discharge (granule: porous body) from the high-temperature drying apparatus 10 accumulates in a region above the first on-off valve V1 and comes into contact with the first level sensor SR1, the first level sensor SR1 The on-off valve V1 is configured to be opened. When the first on-off valve V1 is opened, the second on-off valve V2 is closed.
When the first on-off valve V1 is opened while the second on-off valve V2 is closed, a predetermined amount of granule or porous material is formed between the first on-off valve V1 and the second on-off of the solid matter discharge pipe 10b. Deposits in the region between the valve V2.

When the granule or porous body deposited in the region between the first on-off valve V1 and the second on-off valve V2 comes into contact with the second level sensor SR2, the second on-off valve V2 is opened and the granule ( The porous body) is configured so as to be put into the post-treatment water retention kneader 20. At this time, the first on-off valve V1 is closed.
In other words, the solid material discharge pipe 10b, the first on-off valve V1, the second on-off valve V2, the first level sensor SR1, and the second level sensor SR2 are put into the post-treatment water retention kneader 20. It acts as a meter for the processed material. The first on-off valve V1 and the second on-off valve V2 are not opened at the same time, and only one of them is opened.

In the high-temperature drying apparatus 10, the processed material (solid matter separated by the solid-liquid separator 160, such as sewer sludge, sludge stored in the bottom of a pond or fire prevention water tank) that has been input to the input port 91 is drummed by the input screw 12. It is conveyed into the screen 13 and heated by the high temperature burner 10B.
The heated processed material passes through the screen of the drum screen 13 and enters an annular space between the drum screen 13 and the inner peripheral surface of the casing 11. Here, the drum screen 13 is rotationally driven by a drum drive motor 10M.
A spiral guide bead 13 b is formed on the outer peripheral surface of the drum screen 13. When the drum screen 13 rotates, the processed material that has entered the annular space formed by the inner periphery of the cylindrical casing 11 and the outer periphery of the drum screen 13 is pressed and conveyed by the guide beads 13b while being heated.

In the high temperature drying apparatus 10, the high temperature burner 10B is operating, and the temperature of the flame of the high temperature burner 10B is set to about 900 ° C.
The flame temperature of 900 ° C. is much higher than the vaporization temperature of cesium of 671 ° C. Therefore, most of the contaminant cesium heated and conveyed by the high-temperature drying apparatus 10 is vaporized and removed.
And the vaporized cesium and the fly ash and dust of the high temperature drying apparatus 10 are conveyed from the gas discharge port 10ax to the cyclone 30 via the heat exchanger HX and the connection member JD.

The remaining solid (granule: porous body) from which most of the contained cesium has been vaporized is treated by a certain amount (in a so-called “batch type”) after treatment through the solid discharge pipe 10b. The kneading machine 20 is charged.
The post-treatment water retention kneader 20 includes a cylindrical casing 21, a screw conveyor 22, and a screw conveyor drive motor 23. As for the cylindrical casing 21, the screw conveyor 22, and the screw conveyor drive motor 23, the center axis | shaft is arrange | positioned horizontally all.

In FIG. 2, the screw conveyor drive motor 23 is arrange | positioned in the left end in the cylindrical casing (outer tube) 21 of the double tube structure of the post-process water retention kneader 20. FIG.
An inlet 21i is formed in the vertical direction near the right end of the outer periphery of the cylindrical casing 21, and a discharge port 21o is formed in the vertical direction near the left end.
An acidic water inlet 21a is formed in the vicinity of the inlet 21i on the outer periphery of the cylindrical casing 21, and acidic aqueous water not containing cesium is injected into the cylindrical casing 21 via the acidic water inlet 21a. The The acidic aqueous solution supply system will be described later in relation to the water treatment mechanism DVW.
A cooling water injection port 21c is formed in the vertical direction near the right end of the outer periphery of the cylindrical casing 21, and a cooling water discharge port 21h is formed in the vertical direction near the discharge port 21o.

Since the solid matter discharged from the solid matter discharge pipe 10b of the high-temperature drying apparatus 10 is heating agglomerated fine dust, it is often a porous granule. And as above-mentioned, the said granule hardly contains cesium. And if the said radiation amount is below a regulation value, the said granule can not only be embed disposal, but can also be reused as a soil improvement material.
Here, the granules in the state discharged from the solid material discharge pipe 10b of the high-temperature drying apparatus 10 have a high pH and strong alkalinity. In the post-treatment water retention kneader 20, an acidic aqueous solution is added to the granule to neutralize the granule so that it can be embedded or used as a soil improvement material. As the oxidized water solution injected from the acidic water inlet 21a of the post-treatment water retention kneader 20, the water (oxidized aqueous solution) generated by the treatment in the oxidation solution storage tank 220 (FIG. 1) of the water treatment mechanism DVW is used. I can do it.
In addition, since the said granule is a porous body and its surface area per unit volume is large, it can exhibit favorable adsorption | suction performance, can adsorb | suck the radioactive substance in contaminated soil, and does not elute the adsorbed radioactive substance. Therefore, the radioactive contamination treatment can be performed by backfilling the soil as a soil improvement material.

From the cooling water inlet 21c of the post-treatment water retention kneader 20, the cooling water sent from the cooling circulation tank 240 is injected into the annular portion of the double pipe. This is because the granules discharged from the solid discharge pipe 10b have a high temperature, and if discharged as it is, the surrounding environment is heated.
As shown in FIG. 1, the cooling water injected into the annular portion of the double pipe cools the granules being transported inside the casing 21 to a predetermined temperature, and then is discharged from the discharge port 21h, via a line Lr17 described later. Is returned to the cooling circulation tank 240.

As described above, the cesium vaporized in the high temperature drying apparatus 10 is transported to the cooling cyclone 30 from the gas discharge port 10ax through the heat exchanger HX and the connection duct JD together with the fly ash and dust of the high temperature drying apparatus 10. The
In the heat exchanger HX, a cooling fluid (for example, cooling water cooled in the cooling circulation tank 240) is injected (flow of Fc), and heat is exchanged with gaseous cesium flowing down the heat exchanger HX and warmed. The cooling water is returned to the cooling circulation tank 240 again. The flow of the cooling fluid is indicated by an arrow Fh in FIG.

In FIG. 2, the cyclone 30 includes a conical vortex chamber 31, an upper cylindrical portion 32, a suction portion 33, a gas discharge pipe 34, and a canopy 35 that closes the upper end of the cylindrical portion 32.
The conical vortex chamber 31 is formed by doubling a partially conical tube (as a so-called “jacket”), and is divided into four layers in the vertical direction in the illustrated example. Each of the four layers (the jacket) of the conical vortex chamber 31 is provided with a cooling water injection hole 3ci and a cooling water discharge hole 3co.
The cylindrical portion 32 is connected to the upper end of the vortex chamber 31. The discharge pipe 34 passes through the canopy 35.

The upper end (discharge hole) 34 o of the discharge pipe 34 is connected to the suction port 61 i of the heat exchange flue 60.
Although not clearly shown, the cooling water cooled in the cooling circulation tank 240 is injected into the cooling water injection holes 3ci in the respective jackets of the four layers of the conical vortex chamber 31. The cooling water is heated by exchanging heat with the exhaust of the high-temperature drying device 10 existing in the radially inner region of each jacket. The cooling water whose temperature has been raised is returned to the cooling circulation tank 240 (see FIG. 1; not shown in FIG. 2) from the cooling water discharge hole 3co.

The suction portion 33 of the cyclone 30 is disposed in the vicinity of the outer edge of the cylindrical portion 32 so as to extend in the tangential direction of the cross-sectional shape (circular shape) of the cylindrical portion 32.
The gas discharge pipe 34 communicates (indirectly) with a blower 70B provided in the exhaust cleaning device 70, and the inside of the cyclone 30 (vortex chamber 31) becomes negative pressure by the operation of the blower 70B, and is sucked from the suction part 33. The vaporized cesium is swirled and flows down the vortex chamber 31 vigorously.

The vaporized cesium is sucked into the cyclone 30, cooled in the cyclone conical vortex chamber 31, and solidifies again. When cesium solidifies, it is adsorbed by colloidal particles (fine dust) contained in the exhaust.
Since fine dust (solid matter) adsorbing cesium has a large specific weight, it is centrifuged in the conical vortex chamber 31 of the cyclone and descends along the inner wall of the vortex chamber 31. The fine dust (solid matter) adsorbing cesium is charged into the cylindrical casing 41 of the kneader 40 after the cyclone treatment from the solid matter outlet 31o.
The gaseous cesium that has not solidified in the vortex chamber 31 is sucked into the suction port 72i of the exhaust gas cleaning device 70 via the gas discharge pipe 34 and the heat exchange flue 60 of the cyclone 30 by the suction force of the blower 70B.

The kneading machine 40 after the cyclone treatment (hereinafter, referred to as the kneading machine 40) includes a cylindrical casing 41, a screw conveyor 42, and a screw conveyor drive motor 43. The cylindrical casing 41 is connected to the lower end of the cyclone 30.
The cylindrical casing 41, the screw conveyor 42, and the screw conveyor drive motor 43 all have their central axes extending in the horizontal direction.

In FIG. 2, a screw conveyor 42 is accommodated in a cylindrical casing 41 having a double-pipe structure of a kneader 40, and a screw conveyor drive motor 43 is disposed at the left end of the casing 41.
A solid material discharge port 31o of the cyclone 30 is disposed above the left end of the cylindrical casing 41 in the vertical direction. A discharge pipe 44 for fine dust (solid matter) is formed below the right end of the casing 41 in the vertical direction. The discharge pipe 44 communicates with the stabilization processing kneader 50.

In the cylindrical casing 41, a cooling water inlet 41c for injecting cooling water is formed below a portion connected to the solid matter outlet 31o. A cooling water discharge port 41 h is formed below the right end of the cylindrical casing 41. The cooling water injected into the casing 41 from the cooling water inlet 41c and discharged from the cooling water outlet 41h is the cooling water cooled in the cooling circulation tank 240 (see FIG. 1).
In FIG. 2, the fine dust adsorbing cesium is at a high temperature, and is charged into the casing 41 of the kneader 40 from the solid matter outlet 31o. The fine dust thrown into the casing 41 is conveyed in the casing 41 to the right side of FIG.
While being conveyed by the screw conveyor 42, the cooling water cooled in the cooling circulation tank 240 (FIG. 1) is injected from the cooling water inlet 41c, and heat is taken from the high-temperature fine dust being transferred (cooling water). The temperature is raised and returned to the cooling circulation tank 240 (FIG. 1) from the cooling water discharge port 41h.

As shown in FIG. 3, the cyclone 30 can be constituted by a multistage cyclone.
In the example of FIG. 3, first, the gas exhaust pipe 34A of the main cyclone 30A is connected to the suction portions of the three cyclones 30B, 30C, and 30D. The gas exhaust pipes of the three cyclones 30B, 30C, and 30D merge into one gas exhaust pipe, and are connected to a heat exchange flue 60 (not shown in FIG. 3).
By configuring the cyclone 30 in multiple stages, the separation efficiency of solid and gas can be improved.

In FIG. 2, a third opening / closing valve V <b> 3 is interposed in the discharge pipe 44 of the kneader 40. The third level sensor SR3 is attached to the area above the on-off valve V3 in the discharge pipe 44, and the fourth level sensor SR4 is attached to the area below the on-off valve V3 in the discharge pipe 44. Yes.
When fine dust (solid matter) that has been stabilized and adsorbed (contained) cesium accumulates in a region above the third on-off valve V3 in the discharge pipe 44 and comes into contact with the third level sensor SR3, The on-off valve V3 is configured to be opened. At this time, the fourth on-off valve V4 is closed.

When the fourth on-off valve V4 is closed and the third on-off valve V3 is opened, the fine dust adsorbed cesium is between the third on-off valve V3 and the fourth on-off valve V4 in the discharge pipe 44. Deposit in the area. In this state, when the fine dust comes into contact with the fourth level sensor SR4, the fourth on-off valve V4 is opened, and the fine dust containing cesium is put into the stabilization treatment kneader 50. Yes. At this time, the third on-off valve V3 is closed.
In other words, the discharge pipe 44, the third on-off valve V3, the fourth on-off valve V4, the third level sensor SR3, and the fourth level sensor SR4 are put into the stabilization processing kneader 50. It functions as a weighing means for weighing the processed material (fine dust).

The stabilization processing kneader 50 includes a cylindrical casing 51, a screw conveyor 52, and a screw conveyor drive motor 53.
In FIG. 2, a screw conveyor 52 is accommodated in a cylindrical casing 51 having a double-pipe structure of a stabilization treatment kneader 50, and a screw conveyor drive motor 53 is disposed at the right end of the casing 51.
A fine dust inlet 51 i for introducing fine dust containing cesium into the casing 51 is disposed above the left end of the cylindrical casing 51 in the vertical direction. Further, a discharge port 51o for discharging the processed product after the stabilization process is formed below the right end in the vertical direction.

In the vicinity of the fine dust inlet 51i in the cylindrical casing 51, a sodium silicate water inlet 51a and a sodium phosphate water inlet 51b are formed. A cooling water inlet 51c is formed in the vicinity of the fine dust inlet 51i below the outer periphery of the cylindrical casing 51, and a cooling water outlet 51h is formed in the vicinity of the outlet 51o. The cooling water used here is the cooling water cooled in the cooling circulation tank 240 (FIG. 1).
In the stabilization treatment kneader 50, by adding and adding sodium silicate water and sodium phosphate water to fine dust in which cesium is contained, the fine dust is solidified into a water glass. And as shown in FIG. 1, the stabilization solid substance solidified in the shape of water glass is stored in the exclusive shielding container 5, and the said exclusive shielding container 5 is stored for a predetermined period in the underground deep part which a country establishes, for example.

In FIG. 2, the heat exchange flue 60 has a processing fluid passage duct 61, a heat exchange jacket 62, and a partition plate 63. The lower left end of the processing fluid passage duct 61 in FIG. 2 is an inlet 61 i of the heat exchange flue 60.
On the right end side of the processing fluid passage duct 61, an exhaust port 61o is formed downward in a direction orthogonal to the processing fluid passage duct 61.

The heat exchange jacket 62 in the heat exchange flue 60 extends entirely concentrically with the processing fluid passage duct 61 and is configured as an annular tube surrounding the processing fluid passage duct 61.
The right end of the heat exchange jacket 62 in FIG. 2 is formed with an exhaust inflow hole 62 i into which the exhaust cleaned by the exhaust cleaning device 70 (already cooled) flows.
On the other hand, an exhaust discharge port 62 o is formed in the vicinity of the left end of the heat exchange jacket 62, and the exhaust discharge port 62 o extends vertically upward perpendicular to the heat exchange jacket 62.
The exhaust port 61o in the heat exchange flue 60 is connected to the suction port 72i of the exhaust cleaning device 70, and the exhaust inflow hole 62i is connected to the exhaust hole 7D2i of the exhaust duct 7D2 of the exhaust cleaning device 70.

The partition plate 63 in the heat exchange flue 60 is an annular plate member that connects the outer periphery of the processing fluid passage duct 61 and the inner periphery of the heat exchange jacket 62, and a plurality of holes 63h are formed in the center of the plate portion. ing.
In the heat exchange flue 60, the exhaust Fx flowing through the heat exchange jacket 62 is a gas from the cyclone 30 flowing through the processing fluid passage duct 61 (a gas containing cesium of a gas that has not been solidified by the cooling cyclone 30). The gas from the cyclone 30 is cooled, and the exhaust Fx of the exhaust cleaning device 70 is heated and discharged to the atmosphere through the exhaust outlet 62o.

The exhaust cleaning device 70 includes a cleaning tank 71, vertical introduction pipes 72, a plurality (three in the figure) of exhaust cleaning water injection portions 73, a plurality (three in the figure) horizontal partition plates 74, and an inclined partition plate. 75 and a plurality (four places in the figure) of vertical partition plates 76.
The vertical introduction pipe 72 is disposed so as to extend above the left end of the cleaning tank 71 in FIG.

A plurality (three in the figure) of exhaust cleaning water injection portions 73 are provided at equal intervals in the vertical introduction pipe 72, and a plurality (three in the figure) horizontal partition plates 74 are equally spaced in the vertical introduction pipe 72. It is partitioned by. Note that the horizontal partition plate 74 does not close the entire inside of the vertical introduction pipe 72, but a part thereof is missing (for example, in a crescent shape), and the missing part is bent vertically downward.
The inclined partition plate 75 is disposed below the horizontal partition plate 74 and at the boundary between the vertical introduction pipe 72 and the cleaning tank 71. The end of the inclined partition plate 75 is bent vertically downward.

A plurality (four in the figure) of vertical partition plates 76 are provided to hang from the canopy 71c of the cleaning tank 71 so as to equally divide the cleaning tank 71 in the horizontal direction with the entire width in the width direction of the cleaning tank 71. ing. The lower edge of the vertical partition plate 76 reaches below the water surface in the cleaning tank 71.
Near the center of the adjacent vertical partition plates 76, a plurality of inclined plates 77 whose end portions are bent at right angles (three in the illustrated example) are inclined. A sufficient gap is formed between the end bent at the right angle and the lower surface of the canopy 71c to allow gas to flow. The lower end of the inclined partition plate 77 also reaches below the water surface in the cleaning tank 71.
Here, an appropriate number of the inclined partition plates 77 promotes the liquid level WL to move up and down when a blower 70B described later operates, so that the gaseous cesium is transferred to the water in the cleaning tank 71. Promotes being taken in.

In the canopy 71c of the cleaning tank 71, a first duct 7D1 is provided in the vicinity of the right end in FIG. 2 so as to extend vertically upward.
The end of the first duct 7D1 on the side away from the cleaning tank 71 is connected to the suction port 70Bi of the blower 70B. The discharge port 70Bo of the blower 70B is connected to one end of the second duct 7D2.
The second duct 7D2 has a vertical portion 7D21 and a horizontal portion 7D22, and the end of the horizontal portion 7D22 is connected to the exhaust inflow hole 62i of the heat exchange jacket 62.

The cleaning tank 71 is filled with water up to the upper edge 71t of the cleaning tank 71.
When the gas from the cyclone 30 side passes through the water in the cleaning tank 71, gaseous cesium is dissolved in the water.
The blower 70 </ b> B is operated by the blower motor 70 </ b> M to generate a negative pressure, so that the inside of the upstream device communicating with the exhaust cleaning device 70 is made a negative pressure. Then, gas containing cesium vapor is sucked from the heat exchange flue 60 into the suction port 72 i of the exhaust gas cleaning device 70.

In the exhaust gas cleaning device 70, the cooling water is sprayed from the exhaust gas cleaning water injection unit 73 in each of a plurality of compartments (3 compartments in the drawing) to the gas (including vaporized cesium) sucked from the inlet 72i. Cesium dissolves in the cooling water. The horizontal partition plate 74 has a function of promoting the dissolution of cesium into the cooling water.
The cooling water containing cesium is dropped into the cleaning tank 71 along the inclined partition plate 75. In the washing tank 71, due to the negative pressure of the blower 70B, the cesium in the space formed by the adjacent partition plates 76 passes through the water and dissolves in the water.
The water in which cesium is dissolved is discharged from the water discharge port 71bo (it can also be discharged from 71ao), and is transported to the roughing raw water tank 80 of the water treatment mechanism DVW.

In FIG. 2, since the vaporized cesium dissolves in water until reaching the space ER at the right end of FIG. 2 in the cleaning tank 71, the gas in the space ER does not include the vaporized cesium.
Therefore, if the blower 70B is operated by the motor 70M, gas that does not include cesium passes from the space ER to the heat exchange jacket 62 in the heat exchange flue 60 via the first duct 7D1 and the second duct 7D2. Inflow. The cooling air that has flowed into the heat exchange jacket 62 exchanges heat with the high-temperature gas (gas from the cyclone 30: containing cesium vaporized) flowing down the processing fluid passage duct 61, raises the temperature, and exhausts the exhaust gas. The gas is discharged from the outlet 62o to the atmosphere.

FIG. 4 shows the exhaust cleaning device 70 and the water treatment mechanism DVW (see FIG. 1) in detail.
In order to clearly indicate individual devices, in FIG. 4, the left and right orientations and arrangements of the devices, the length of the lines, and the extending direction do not necessarily match those in FIG. 1. However, FIG. 1 and FIG. 4 are the same regarding the processing procedure or route.
In FIG. 4, the water treatment mechanism DVW includes a roughing raw water tank 80, a primary stirring reaction tank 90, a secondary stirring reaction tank 110, a coagulation sedimentation tank 140, a solid-liquid separator 160, and a makeup water tank 180. , A fresh water tank 190, a supernatant water tank 200, and a bag filter tank 210 are provided.

The roughing raw water tank 80 includes a solid-liquid separation unit 81, a processing liquid storage tank 82, a solid material receiving container 83, and a transport pump 80 </ b> P installed at the bottom of the processing liquid storage tank 82.
A processing liquid inlet 81 i is provided at the upper end of the solid-liquid separator 81.
The inclined part 81a that forms the solid-liquid separation part 81 acts as a roughing sieving sieve for separating solids from the treatment liquid.
Exhaust cleaning contaminated water (processing liquid) cleaned by the exhaust cleaning device 70 is input to the processing liquid input port 81i via the line L1. In the line L1, a conveyance pump 70P is interposed in the region on the exhaust cleaning device 70 side.
In the inclined portion 81a, relatively large foreign matters such as dust (for example, 4 mm or more) are removed from the processing liquid. The processing liquid from which the foreign matter has been removed falls into the processing liquid storage tank 82 below the solid-liquid separator 81.

The processing liquid in the processing liquid storage tank 82 is sent to the primary agitation reaction tank 90 at a predetermined timing by the transport pump 80P.
The primary stirring reaction tank 90 includes a reaction tank 91, a stirring blade 92, a motor 93 that rotates the stirring blade, a liquid level sensor 94, and a transport pump 90 </ b> P installed at the bottom of the reaction tank 91.
A primary quantitative feeder 100 that quantitatively supplies the first flocculant to the reaction tank 91 is disposed above the reaction tank 91. Although not clearly shown in the figure, the drive motor of the screw conveyor for supply of the primary fixed amount feeder 100 is configured to be interlocked with the transport pump 80P of the roughing raw water tank 80. The stirring blade 92 and the motor 93 that rotates the stirring blade 92 are always operating.

When the processing liquid is introduced into the primary agitation reaction tank 90 by the transport pump 80P, the first coagulant is automatically supplied from the primary metering feeder 100 to the reaction tank 91, and at the same time, the agitation blade 92 rotates. When the stirring blade 92 rotates, an ionic reaction occurs between the treatment liquid in the reaction vessel 91 and the first flocculant, and cesium in the treatment liquid is agglomerated by the first flocculant.
When the liquid level sensor 94 in the primary agitation reaction tank 90 detects the liquid level, the transport pump 90P is activated, and the processing liquid in the reaction tank 91 (is fed with the first flocculant via the line L3 and stirred). The treated liquid) is conveyed to the secondary agitation reaction tank 110.

The secondary stirring reaction tank 110 includes a reaction tank 111, a stirring blade 112, a motor 113 that rotates the stirring blade, and a liquid level sensor 114.
At the bottom of the reaction tank 111, a discharge port 110o for discharging the processing liquid is formed.
Above the reaction tank 111, a secondary fixed amount feeder 120 for supplying the second flocculant quantitatively to the reaction tank 111 is disposed.
Although not explicitly shown, the secondary quantitative feeder 120 has a supply screw conveyor for quantitatively supplying the second flocculant. When the processing liquid is introduced into the secondary agitation reaction tank 110 by the transport pump 90P of the primary agitation reaction tank 90, the second coagulant is automatically supplied from the secondary quantitative feeder 120 to the reaction tank 111, and simultaneously stirred. The wing 112 is configured to rotate. When the stirring blade 112 rotates, an ionic reaction occurs between the treatment liquid in the reaction vessel 111 and the second flocculant, and impurities including cesium further aggregate.

The discharge port 110o of the secondary agitation reaction tank 110 is connected to the input port 140i of the coagulation sedimentation tank 140 by a line L4, and a pressure pump 130 is interposed in the line L4.
When the liquid level sensor 114 in the secondary agitation reaction tank 110 detects a predetermined amount, the pumping pump 130 is activated and the processing liquid in the reaction tank 111 is conveyed to the coagulation sedimentation tank 140.

The coagulation sedimentation tank 140 includes a sedimentation tank main body 141, a screw conveyor 142 disposed at the bottom of the precipitation tank main body 141, a motor 143 that rotationally drives the screw conveyor 142, and a liquid level sensor 144.
A first discharge port 141a is formed near the right end of FIG. 4 at the bottom of the settling tank main body 141, and the precipitate of the processing liquid in the settling tank main body 141 is discharged through the first discharge port 141a. Is done.
On the other hand, a second discharge port 141b is formed on the right side surface of the settling tank main body 141, and the supernatant of the processing liquid in the settling tank main body 141 is discharged through the second discharge port 141b.

The first discharge port 141a in the coagulation sedimentation tank 140 is connected to the processing liquid input port 160i of the solid-liquid separator 160 via a line L5 having an open / close valve V5, a pressure feed pump 150, and an open / close valve V6. .
The second outlet 141b in the coagulation sedimentation tank 140 is connected to the line L10, and the line L10 communicates with the supernatant water tank 200.

In the treatment liquid charged into the coagulation sedimentation tank 140, cesium is coagulated and adsorbed by the coagulant added in the primary stirring reaction tank 90 and the secondary stirring reaction tank 110. As time passes, the aggregate precipitates in the settling tank body 141 and is separated from the supernatant.
When the liquid level sensor 144 detects that the liquid level in the settling tank main body 141 has reached a predetermined level or more, the screw conveyor 142 is operated, and the on-off valves V5 and V6 interposed in the line L5 are opened, and the pressure feed pump 150 also operates, and the sediment stored at the bottom in the sedimentation tank body 141 is pumped to the solid-liquid separator 160.

The solid-liquid separator 160 includes a temporary storage tank 161, a rotating drum 162, and a solid material scraping swash plate 163. Reference numeral 160 o indicates a rotating shaft of the rotating drum 162.
The temporary storage tank 161 has a V-shaped bottom and has a function of storing the sediment transported from the sedimentation tank body 141. In the vicinity of the lower end of the temporary storage tank 161, a processing liquid inlet 160i for taking in the sediment transported from the sedimentation tank body 141 is formed.
The rotating drum 162 is immersed in the sediment of the temporary storage tank 161 at about 1/3 of the surface thereof. The outer peripheral surface of the rotating drum 162 is surface-treated so as to easily capture the precipitate. The outer peripheral surface of the rotary drum 162 is configured to allow liquid to pass but not to pass solids.
The solid material scraping swash plate 163 is disposed so that the upper end is in contact with the surface of the drum 162, and is configured to scrape the solid material adhering to the surface of the rotating drum 162.

As the rotating drum 162 rotates, deposits adhere to the surface of the drum 162. Although not explicitly shown, a negative pressure is acting on the radially inner region of the rotating drum 162, and the liquid in the sediment is sucked by the negative pressure, passes through the surface of the drum 162, and passes through the line L7. Flow into.
On the other hand, although the solid in the precipitate is also sucked by the negative pressure, it cannot pass through the surface of the drum 162 and therefore adheres to the surface of the drum 162. The solid adhering to the surface of the drum 162 is scraped off by a solid scraping swash plate 163.
The solid scraped off by the solid scraping swash plate 163 (solid content of cesium agglomerated) is not clearly shown, but, for example, the high-temperature drying apparatus 10 (FIG. 1, FIG. 1) by the belt conveyor 8 or a dedicated cart. 2) and is put into a charging port 91 (see FIGS. 1 and 2) of the high-temperature drying apparatus 10.

The liquid that has permeated the surface of the rotary drum 162 is supplied to the first suction port 171 of the circulation pump 170 via the line L7. The circulation pump 170 is provided in the makeup water tank 180.
The makeup water tank 180 has a treated water suction port 182 formed at the upper end of the tank body 181, a treated water discharge port 183 formed near the bottom, and a transport pump 180 </ b> P installed at the bottom of the tank 180. Has been.

The circulation pump 170 is formed with a first suction port 171, a discharge port 172, and a second suction port 173. The discharge port 172 of the circulation pump 170 is connected to the suction port 182 of the makeup water tank 180 by a line L8, and the second suction port 173 of the circulation pump 170 is connected to the discharge port 183 of the makeup water tank 180 and the line Lr8. It is connected.
The pump 180P for conveyance installed in the tank 180 is connected to the line L9, and the line L9 communicates with the fresh water tank 190. The water stored in the makeup water tank 180 is transferred to the fresh water tank 190 via the transfer pump 180P and the line L9.

In the supernatant tank 200 to which the supernatant liquid of the coagulation sedimentation tank 140 is supplied, a treatment liquid discharge port 201 is formed in the vicinity of the bottom, and a line L11 in which a transfer pump 200P is interposed is provided in the discharge port 201. Connected.
The supernatant tank 200 has a function of temporarily storing the supernatant liquid sent from the coagulation sedimentation tank 140 via the line L10.
The pump 200P operates according to the operation status of the bag filter tank 210 connected via the line L11, and supplies the supernatant liquid in the supernatant tank 200 to the bag filter tank 210 via the line L11.

The bag filter tank 210 includes a filter housing 211, a bag filter (filter medium) 212, a storage tank 213, and a liquid level sensor 214.
In the storage tank 213, a pump 210P for processing liquid conveyance is installed.
In the bag filter tank 210, impurities contained in the processing liquid (the supernatant liquid of the coagulation sedimentation tank 140) transferred from the supernatant tank 200 are filtered by a filter (filter medium) 212 disposed in the filter housing 211. The filtered processing liquid is transported to the fresh water tank 190 via the line L12 by the transport pump 210P.
The transfer pump 210P operates when the liquid level sensor 214 detects that the liquid level of the processing liquid filtered by the filter 212 exceeds a predetermined first predetermined value.
On the other hand, the transfer pump 200P of the supernatant tank 200 senses that the liquid level of the processing liquid filtered by the filter 212 is below a predetermined second predetermined value by the liquid level sensor 214 of the bag filter tank 210. In this case, the processing liquid in the supernatant tank 200 is charged into the charging port 211i of the bag filter tank 210.

A transfer pump 190 </ b> P is installed at the bottom of the fresh water tank 190. The transfer pump 190P is connected to a line L13, and the line L13 is provided with a first line pump LP1, and branches to a line L14 and a line L15 at a branch point B1.
The line L14 is provided with an on-off valve V7, and the line L14 communicates with the oxidizing solution storage tank 220 (see FIG. 1).
In FIG. 4, the line L15 is branched into a plurality of lines from the branch point B1 side via the line pump LP2 and the on-off valve V8. Each of the branched lines communicates with each of the plurality of exhaust cleaning water injection portions 73 of the exhaust cleaning device 70.
Although not explicitly shown, the on-off control of the on-off valves V7 and V8 is performed by a centralized control panel (control computer 300: FIG. 1).

In FIG. 1, the oxidizing solution storage tank 220 communicating with the line L14 includes a tank body 221, a stirring blade 222, and a motor 223 that rotationally drives the stirring blade. An acidic solution is added to the treated water in the tank body 221 and the treated water is always kept at about pH 3.
A discharge port 221o is formed in the vicinity of the bottom of the tank body 221, and the discharge port 221o communicates with the acidic water injection port 21a of the post-treatment water retention kneader 20 via a line L16 with a metering pump 230 interposed. doing. When the metering pump 230 is activated, acidic treated water is supplied from the oxidizing solution storage tank 220 to the treated water retention kneader 20. The operation control of the metering pump 230 is also performed by the centralized control panel (control computer 300).

In FIG. 1, the pollutant treatment apparatus 1 is cooled in a cooling circulation tank 240 as cooling water for the post-treatment water retention kneader 20, the cyclone-treated kneader 40 and the stabilization kneader 50 equipped in the cyclone 30. Used cooling water is used.
The cooling circulation tank 240 has a circulation tank 241 for cooling the circulating water, and a circulation pump 240P provided at the bottom of the circulation tank 241.
Suction ports 242, 243, and 244 are formed at three locations near the bottom and near the bottom of the circulation tank 241.

The circulation pump 240P communicates with the cooling water inlet 21c of the post-treatment water retention kneader 20 via the line L17.
Circulation pump 240P is also connected to line L18, and line L18 branches to line L19 and line L20 at branch point B2. The line L19 communicates with the cooling water inlet 41c in the kneader 40 after the cyclone treatment. The line L20 communicates with the cooling water inlet 51c in the stabilization kneader 50.

The suction port 242 of the cooling circulation tank 240 communicates with the cooling water discharge port 41h in the kneader 40 after the cyclone treatment via the line Lr19.
The suction port 243 of the cooling circulation tank 240 communicates with the cooling water discharge port 51h in the stabilization processing kneader 50 through the line Lr20.
The suction port 244 of the cooling circulation tank 240 communicates with the cooling water discharge port 21h of the post-treatment water retention kneader 20 via the line Lr17.
That is, the cooling water cooled in the cooling circulation tank 240 is used for cooling the object to be treated in the post-treatment water retention kneader 20, the kneader 40 after the cyclone treatment, and the stabilization treatment kneader 50. The cooling water heated by heat exchange in the post-treatment water retention kneader 20, the cyclone kneader 40, and the stabilization kneader 50 is returned to the cooling circulation tank 240, cooled, and used again for cooling. It is done.

According to 1st Embodiment of FIGS. 1-4, since sludge is heated to about 900 degreeC with the high temperature drying apparatus 10, cesium vaporizes and isolate | separates completely from sludge. Therefore, cesium is not included in the solid matter discharged from the high-temperature drying apparatus 10.
Therefore, the solid matter can be embedded (if the radiation dose is equal to or less than a predetermined reference value) and can be used as a soil improvement material.

The fly ash, dust, and vaporized cesium in the high-temperature drying apparatus 10 are cooled by the cyclone 30 and separated into a solid and a gas.
The solid (solid matter) separated by the cyclone 30 is subjected to stabilization treatment (for example, a treatment for adding a sodium silicate aqueous solution and a phosphoric acid aqueous solution to solidify it into a glass state), and then storing it in the dedicated shielding container 5. I can do it. That is, the solid (solid matter) separated by the cyclone 30 is safely processed.
On the other hand, when the gas separated by the cyclone 30 moves in the water in the exhaust cleaning device 70, vaporized cesium is collected by the water and removed from the gas. Therefore, the gas that has passed through the exhaust cleaning device 70 is cleaned.

In the first embodiment, the water in which cesium is collected by the exhaust cleaning device 70 is a water treatment mechanism DVW including the coagulation sedimentation tank 140 (the roughing raw water tank 80, the primary stirring reaction tank 90, the secondary stirring reaction tank 110, The sludge containing cesium in the water is agglomerated and precipitated in the agglomeration sedimentation tank 140.
And the deposit of the coagulation sedimentation tank 140 is isolate | separated into a solid and a liquid with the solid-liquid separator 160, and the isolate | separated solid is processed with process equipment (not shown), such as the high temperature drying apparatus 10. FIG.
Further, the supernatant liquid of the coagulation sedimentation tank 140 and the liquid separated by the solid-liquid separator 160 are used as exhaust cleaning water in the exhaust cleaning apparatus 70 or stabilized by a processing facility (not shown). I can do it.

That is, according to the illustrated first embodiment, the sludge containing the radioactive substance (eg, cesium) is separated into solid, gas, and liquid, and the radioactive substance (eg, cesium) is completely removed from each, Radioactive substances (for example, cesium) are removed from the sludge.
And since all the processes to remove radioactive substances (eg cesium) from the sludge can be performed in a closed system, the sludge contaminated with high-concentration radioactive substances can be processed without being exposed to the workers. I can do it.

Next, a second embodiment of the present invention will be described with reference to FIG.
In 1st Embodiment of FIGS. 1-4, sludge is heated with the high temperature drying apparatus 10 first.
In contrast, in the pollutant treatment apparatus 1A of the second embodiment, first, the water treatment mechanism DVW performs solid-liquid separation of sludge and contaminated water to be treated, and the separated solid is heated by the high-temperature drying apparatus 10. doing.

Further, in the second embodiment, in FIG. 5, the sludge (including sewage sludge and the like) MD and the contaminated water PW in the pond, the fire prevention water tank, and the like are mixed in the mixing tank 5 and sent to the roughing raw water tank 80. It differs from 1st Embodiment of FIGS. 1-4.
Hereinafter, the points of the second embodiment of FIG. 5 different from the first embodiment of FIGS. 1 to 4 will be mainly described.
In FIG. 5, the contaminant treatment apparatus 1 </ b> A according to the second embodiment includes a mixing tank 5. In order to mix the sludge MD and the contaminated water PW, the mixing tank 5 has a stirring pump 5MP in addition to the transport pump 5P.
When mixing the sludge MD and the contaminated water PW in the mixing tank 5, if the amount of the contaminated water PW is insufficient, the water from the fresh water tank 190 is supplied to the line L 13, the line L 15, the branch point B 3, and the line L 162. Via, it can add to the processing liquid in the mixing tank 5 with the supply nozzle 6 (code | symbol N in FIG. 5), and can send out to the roughing raw | natural water tank 80 with the conveyance pump 5P installed in the bottom part of the mixing tank 5. .

However, when the water in the fresh water tank 190 circulates in the pollutant treatment apparatus 1A, there is a case where there is a concern about an increase in the concentration of cesium in the water. As described above, when there is a concern about increasing the concentration of cesium, the water from the fresh water tank 190 is not only added to the treatment liquid in the mixing tank 5 but also reused for other purposes. In other words, the quality of the water from the fresh water tank 190 is not returned to the roughing raw water tank 80.
In addition, arrows X, Y, Z, and N on the upper left in FIG. 5 indicate different states of one mixing tank 5 at the same time for convenience, and arrow X indicates a state where the mixing tank 5 is not stirred. An arrow Y indicates a state where the mixing tank 5 is being stirred by the stirring pump 5MP, and an arrow Z indicates a state where the mixing tank 5 is being stirred by the stirring pump 5MP and is supplied to the roughing raw water tank 80 by the line L25. Indicates.

In the coagulation sedimentation tank 140, the sludge containing cesium aggregates and precipitates by the addition of the coagulant in the primary stirring reaction tank 90 and the secondary stirring reaction tank 110.
The sludge precipitated in the coagulation sedimentation tank 140 contains cesium at a high concentration, and the sludge is pumped to the solid-liquid separator 160 via the pump pump 150. The solid-liquid separator 160 is the same as that described in the first embodiment.
The solid matter separated by the solid-liquid separator 160 is sent to the fixed-quantity supply screw conveyor 9 via the transport device 8 and the transport means indicated by reference numeral LS.

On the other hand, the liquid separated by the solid-liquid separator 140 is sent to the fresh water tank 190 via the makeup water tank 180 as in the first embodiment.
The supernatant liquid of the coagulation sedimentation tank 140 is also sent to the fresh water tank 190 via the supernatant water tank 200 and the bag filter tank 210 as in the first embodiment.
The solid separated by the solid-liquid separator 160 contains high-concentration cesium, and is fed into the high-temperature drying apparatus 10 via the fixed supply screw conveyor 8.
After being heated by the high-temperature drying apparatus 10, as in the first embodiment, a solid material (for example, having a water content of 15 to 20%) is added while being neutralized by adding an acidic aqueous solution in the post-treatment water retention kneader 20. As a discharge. Since the discharged solid matter is completely vaporized and separated, cesium can be buried if the radiation dose is below a predetermined reference value. Moreover, it is also possible to embed it as a soil improvement material (soil improvement material).

Similarly to the first embodiment, the fly ash, dust, and vaporized cesium of the high-temperature drying apparatus 10 are also sent to the cyclone 30, cooled, and separated into solid and vaporized cesium.
And the solid substance isolate | separated with the cyclone 30 is added to the sodium silicate aqueous solution and the phosphoric acid aqueous solution via the stabilization treatment kneader 50, solidified into a glass, and stored in the dedicated shielding container 5. .
On the other hand, the gas containing the vaporized cesium is conveyed to the exhaust cleaning device 70, cooled, and partly solidifies again. The vaporized cesium and the solidified cesium are dissolved in water by passing through the water stored in the cleaning tank 71 of the exhaust gas cleaning device 70. Therefore, cesium is removed from the gas sent to the exhaust cleaning device 70.
Other configurations and operational effects in the second embodiment of FIG. 5 are the same as those of the first embodiment of FIGS.

  It should be noted that the illustrated embodiment is merely an example, and is not a description to limit the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Pollutant processing apparatus 5 ... Mixing tank 8 ... Conveying device / belt conveyor 9 ... Fixed quantity supply screw conveyor 10 ... High temperature drying apparatus 20 ... After-treatment water retention kneader 30 ..Cyclone 40 ... Kneader 50 after cyclone treatment ... Stabilization kneader 60 ... Heat exchange flue 70 ... Exhaust cleaning device 80 ... Roughing raw water tank 90 ... Primary Stirring reaction tank 100 ... primary fixed quantity feeder 110 ... secondary stirred reaction tank 120 ... secondary fixed quantity feeder 160 ... solid-liquid separator 200 ... supernatant water tank 210 ... bag filter Tank

Claims (3)

A high-temperature drying apparatus having a function of heating the inside to a predetermined temperature;
A cyclone that communicates with the exhaust port of the high-temperature drying device, has a function of cooling the exhaust of the high-temperature drying device, and a function of separating the exhaust of the high-temperature drying device into solid and gas;
An exhaust cleaning device having a function of flowing the gas separated by the cyclone into water;
A pollutant treatment apparatus comprising a water treatment mechanism provided with a coagulation sedimentation tank.   The contaminant treatment apparatus according to claim 1, wherein the water treatment mechanism including the coagulation sedimentation tank treats the water discharged from the exhaust cleaning apparatus.   The pollutant processing apparatus according to claim 1, further comprising a solid-liquid separator for solid-liquid separation of the precipitate in the coagulation sedimentation tank, and provided with a conveying device for feeding the solid separated by the solid-liquid separator into a high-temperature drying device.

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