JP2012159420A - Treatment device and treatment method of solid-liquid mixture radioactive waste liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and method which are capable of uniformly and stably supplying a radioactive waste liquid easily separated into solid and liquid, to a reaction vessel.SOLUTION: A treatment device of a solid-liquid mixture radioactive waste liquid includes: a solid adjustment unit which adjusts a solid-liquid mixture radioactive waste liquid containing two or more kinds of solid different by specific gravity, into a prescribed density; an agitation tank which has a circulation line provided so as to connect a bottom and a side part thereof and agitates the waste liquid which is supplied from the solid adjustment unit and has been adjusted to the prescribed density; and a reaction vessel which reacts the waste liquid agitated in the agitation tank. The solid-liquid mixture radioactive waste liquid adjusted into the prescribed density is introduced from the adjustment unit into the agitation tank, is approximately uniformly agitated while being circulated in the circulation line, and then is supplied to the reaction vessel.

Description

  The present invention relates to a processing apparatus and a processing method for solid-liquid mixed radioactive liquid waste.

  For disposal of solid-liquid mixed radioactive waste generated at nuclear power plants, etc., a method such as oxidizing and decomposing the waste liquid in an appropriate reaction tank, and solidifying the reaction liquid with a solidifying material such as cement and discarding it. Is used. At this time, in order to reduce the amount of waste generated, it is effective to supply a radioactive waste liquid having a constant composition to the reaction tank for treatment (Patent Document 1).

JP-A-10-279726

  However, even if a radioactive liquid waste having a constant composition is supplied to the reaction tank, if the liquid waste is not uniform, there is a problem that the reaction does not occur sufficiently in the reaction tank or the reaction becomes excessively intense.

  In addition, when the solid-liquid mixed radioactive waste liquid contains solids that are easily separated into solid and liquid, such as filter sludge, granules, incinerated ash, ion exchange resin, and HEPA filter, simply stirring the waste liquid with a stirring rod or the like, In some cases, it was difficult to obtain a uniform solid-liquid mixed radioactive liquid waste.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an apparatus and a method that can supply a radioactive waste liquid that can be easily separated into a solid and a liquid at a predetermined concentration uniformly and stably.

As a result of intensive studies to solve the above problems, the present inventor found that the above problems can be solved by a specific apparatus and method, and completed the present invention.
That is, the present invention provides the following [1] to [6].

[1] A solid-state adjusting device that adjusts a solid-liquid mixed radioactive waste liquid containing two or more kinds of solids having different specific gravities to a predetermined concentration;
A circulation line is provided so as to communicate the bottom and the side, and a stirring tank for stirring the waste liquid adjusted to a predetermined concentration supplied from the adjusting device;
A reaction tank for reacting the waste liquid stirred in the stirring tank,
The solid-liquid mixed radioactive waste liquid adjusted to a predetermined concentration is introduced into the stirring tank from the adjusting device, and the waste liquid is circulated in the circulation line and stirred substantially uniformly, and then supplied to the reaction tank. A solid-liquid mixed radioactive liquid waste treatment apparatus characterized by that.

[2] The solid matter adjusting device comprises:
A separation tank in which untreated radioactive liquid waste containing two or more solids having different specific gravities is stored;
Water is supplied from below to above into the separation tank in which the untreated radioactive liquid waste is stored, and the two or more kinds of solids are diffused and settled in the separation tank, whereby the two or more kinds of the solid waste are stored. Backwashing separation means for separating solids into layers in the vertical direction based on the difference in specific gravity in the separation tank;
A solids storage tank for separately storing the solids in each of the two or more layers separated into layers by the backwash separation means;
A solid-liquid mixed radioactive waste liquid containing a predetermined concentration of two or more solids having different specific gravities, and measuring each solid separated in the solid storage tank, [1] An apparatus for treating a solid-liquid mixed radioactive liquid waste according to 1.

[3] The solid-liquid mixed radioactive liquid waste contains at least one solid selected from the group consisting of filter sludge, granules, incinerated ash, ion exchange resin, and HEPA filter, according to [1] or [2]. Of solid-liquid mixed radioactive liquid waste.
[4] The solid-liquid mixed radioactive waste liquid treatment apparatus according to [3], wherein the solid-liquid mixed radioactive waste liquid contains a cation exchange resin and an anion exchange resin.

[5] A preparatory step for preparing in advance a solid-liquid mixed radioactive waste liquid containing two or more kinds of solids having different specific gravities at a predetermined concentration;
A stirring step of stirring substantially uniformly while circulating the waste liquid having a predetermined concentration obtained in the preparation step;
And a supplying step of supplying the waste liquid stirred in the stirring step into the reaction vessel.

[6] The preparation step includes
Water is supplied from the bottom to the top of the separation tank in which the untreated radioactive waste liquid containing two or more kinds of solids having different specific gravity is stored, and the two or more kinds in the separation tank A backwash separation step in which the solids are diffused and settled, thereby separating the two or more kinds of solids into layers in the vertical direction based on the difference in specific gravity in the separation tank;
Solid matter separating step of separating the solids of each of the two or more layers separated into layers by the backwash separation step into individual solid matter storage tanks, and
The solid matter separated in each solid matter storage tank by the solid matter separation step is weighed, and two or more kinds of solids having different specific gravities are mixed at a predetermined concentration by mixing the weighed solid matter and water. A method for treating a solid-liquid mixed radioactive liquid waste according to [5], comprising preparing a solid-liquid mixed radioactive liquid waste contained in 1.

According to the solid-liquid mixed radioactive liquid waste processing apparatus of the present invention, a solid-liquid mixed radioactive liquid waste having a predetermined concentration can be uniformly and stably supplied to a reaction tank that reacts and processes the solid-liquid mixed radioactive liquid waste. .
Moreover, the solid-liquid mixed radioactive liquid waste processing apparatus of the present invention is excellent in safety, operability and maintainability.
Furthermore, according to the solid-liquid mixed radioactive waste liquid processing method of the present invention, the amount of waste generated is small, and the radioactive waste liquid can be safely processed at low cost.

FIG. 1 is a schematic diagram showing an example of a solid-liquid mixed radioactive liquid waste processing apparatus according to this embodiment. FIG. 2 is a schematic diagram showing an example of a solid-liquid mixed radioactive liquid waste processing apparatus according to this embodiment.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments, and various modifications can be made.

≪Processing equipment for solid-liquid mixed radioactive liquid waste≫
FIG. 1 and FIG. 2 are schematic schematic diagrams showing examples of solid-liquid mixed radioactive liquid waste treatment apparatuses 100 and 101 according to the present embodiment, respectively.
Solid-liquid mixed radioactive waste liquid processing apparatus 100, 101 according to the present invention is a solid substance adjusting apparatus A that adjusts a solid-liquid mixed radioactive waste liquid containing two or more kinds of solid substances having different specific gravities to a predetermined concentration, and
A circulation line 2 is provided so as to communicate the bottom and the side, and a stirring tank 1 for stirring the waste liquid adjusted to a predetermined concentration supplied from the adjusting device A,
A reaction tank 11 for reacting the waste liquid stirred in the stirring tank 1, and
The solid-liquid mixed radioactive waste liquid adjusted to a predetermined concentration is introduced into the stirring tank 1 from the adjusting device A and stirred substantially uniformly while circulating the waste liquid in the circulation line 2, and then the reaction tank 11. It is made to supply to.

According to the processing apparatuses 100 and 101 of the present invention, a solid-liquid mixed radioactive waste liquid having a predetermined concentration can be supplied to the reaction tank 11 uniformly and stably. The processing apparatus of the present invention is an apparatus that is excellent in safety, operability, and maintenance, is a simple flow path, and is less likely to be clogged with solid matter.
By using the treatment apparatus of the present invention, the amount of waste generated is small, and solid-liquid mixed radioactive waste liquid can be treated safely at low cost.

The solid substance adjusting device A includes a separation tank 31 in which an untreated radioactive waste liquid containing two or more kinds of solid substances having different specific gravities is stored;
Water is supplied from below to above in the separation tank 31 in which the untreated radioactive liquid waste is stored, and the two or more solids are diffused and settled in the separation tank 31, thereby Backwash separation means for separating the above solid matter in layers in the vertical direction based on the difference in specific gravity in the separation tank;
Solid matter storage tanks 41 and 51 for separately storing the solids of each of the two or more layers separated into layers by the backwash separation means,
A preparation means for measuring each solid separated in each of the solid storage tanks 41 and 51 and preparing a solid-liquid mixed radioactive liquid waste containing two or more kinds of solids having different specific gravities at a predetermined concentration. Is preferred.

  Since the solid-liquid mixed radioactive liquid waste processing apparatus of the present invention has the solid matter adjusting apparatus A, the waste liquid composition supplied to the reaction tank 11 can be accurately grasped. Therefore, it is possible to easily predict and control a change in pH of the waste liquid that may fluctuate when reacting the radioactive waste liquid in the reaction tank, such as a pH adjuster used as necessary in the reaction. The amount of additive used can be greatly reduced. For this reason, if the processing apparatus of this invention is used, it will become possible to reduce the production | generation amount of the waste body finally produced in the process of radioactive waste liquid, and solid-liquid mixed radioactive waste liquid can be processed cheaply.

The solid-liquid mixed radioactive waste liquid is not particularly limited as long as it contains two or more solids having different specific gravities, but is at least one selected from the group consisting of filter sludge, granules, incinerated ash, ion exchange resin, and HEPA filter. It preferably contains a solid material, and preferably contains a cation exchange resin and an anion exchange resin.
Moreover, it is preferable that the solid substance contained in the said solid-liquid mixed radioactive waste liquid is heavier than water.

  The average particle size of the solid contained in the solid-liquid mixed radioactive waste liquid varies depending on the solid contained in the radioactive waste liquid to be treated, but is usually 1-1000 μm, preferably 10-1000 μm. Usually, it is 500 to 850 μm, and in the case of an anion exchange resin, it is usually 450 to 600 μm. In addition, you may perform granulation, grinding | pulverization, sieving, etc. so that the average particle diameter of the solid substance contained in radioactive waste liquid may become the said range.

  Thus, solid materials such as ion exchange resins contained in solid-liquid mixed radioactive waste liquid usually have a large average particle diameter, but the processing apparatus of the present invention is excellent in operability and maintainability, and has a simple flow path. Therefore, there is little possibility that the flow path is clogged with the solid matter. In addition, for the purpose of preventing clogging of the solid material, it is preferable to design the pipe diameter of the line or the like in the processing apparatus of the present invention according to the type of the solid material to be processed. For example, when the waste liquid to be treated contains an ion exchange resin as a solid, the tube diameter is 10 to 100 times, preferably 30 to 80 times the average particle diameter of the solid.

  The separation tank 31 stores untreated radioactive waste liquid containing two or more solids having different specific gravities, and is provided with a separation water supply line 32 and a drain line 34. In the present invention, the separated water supply line 32 and the drain line 34 are also collectively referred to as “backwash separation means”.

  The line or the like in the processing apparatus of the present invention may be provided with a valve for opening and closing the line as needed and a pump for flowing waste liquid or the like as necessary. Moreover, since the processing apparatus of this invention is used when processing a radioactive waste liquid, safety | security is calculated | required especially and the leak from a tank or a line is not permitted by a radioactive waste liquid. For this reason, the tank and the line in the processing apparatus of the present invention are formed of at least one material selected from the group consisting of stainless steel, hastelloy, zircaloy, titanium, titanium-based alloy, ceramics, glass and vinyl chloride, for example. It is preferable. Furthermore, the tank and the line may be subjected to lining treatment if necessary.

  The `` untreated radioactive liquid waste '' means a radioactive liquid waste that has not undergone the preparation process described later, and occurs in nuclear power facilities such as nuclear power plants, spent fuel reprocessing facilities, and nuclear research laboratories. The radioactive waste liquid containing two or more kinds of solids having different specific gravities may be used as they are, or the waste liquid may be subjected to some treatment before being stored in the separation tank 31.

  In the separation tank 31, the water from the water storage tank 33 is supplied into the separation tank 31 from below to above through the separation water supply line 32, and two or more kinds of solids having different specific gravity in the separation tank 31 are supplied. Is allowed to diffuse and settle. Thereby, the said solid substance isolate | separates into a layer form in the up-down direction based on the difference in specific gravity in the separation tank 31 (backwashing separation process).

  When water is supplied into the separation tank 31, the water is stored in the separation tank 31 outside the separation tank 31 (for example, the water storage tank 33) from a drain line 34 provided on the upper part of the separation tank 31 as necessary. You may drain the water.

  The solids storage tanks 41 and 51 are respectively supplied with solids transfer lines 42 and 52 for transferring solids from the separation tank 31 and the solids storage tanks 41 and 51 respectively to the stirring tank 1. Solids supply lines 61 and 62 are provided.

  The solids in each of the two or more layers separated into layers in the vertical direction by the backwash separation means are respectively passed through the first solid matter transfer line 42 to the first solid matter storage tank 41 and the second Are stored in the second solid storage tank 51 through the solid transfer line 52 (solid separation process). Specifically, in the separation tank 31, the solid matter having a higher specific gravity settles in the lowermost part of the tank 31, so that the solid matter is stored in the first solid matter storage tank 41.

  1 and 2 show two solid storage tanks, the number of solid storage tanks may be appropriately increased according to the radioactive waste liquid used. That is, when the waste liquid to be used includes three or more kinds of solids having different specific gravities, a treatment apparatus including three or more solids storage tanks can be provided.

  The solids separated into the solid storage tanks 41 and 51 by the sorting step are each weighed out so that the amount supplied to the stirring tank 1 becomes a predetermined amount, and the preparation means has two or more kinds of different specific gravity. A solid-liquid mixed radioactive waste liquid containing solids at a predetermined concentration is prepared. The solid-liquid mixed radioactive waste liquid containing two or more kinds of solids having different specific gravities at a predetermined concentration is preferably prepared by mixing the measured solids and water (preparation step). Moreover, in this preparation process, you may further add additives, such as an acid or an alkali for adjusting pH etc. as needed.

  The “predetermined concentration” is appropriately selected depending on the reaction method for treating the solid-liquid mixed radioactive waste liquid, etc., and the concentration of the entire solid in the solid-liquid mixed radioactive waste liquid is a predetermined value, and It means that the concentration of each of the two or more solids in the solid-liquid mixed radioactive waste liquid is a predetermined value. Moreover, it means that the ratio of each of the two or more solids in the solid-liquid mixed radioactive waste liquid is a predetermined value.

  For example, the concentration of the whole solid in the solid-liquid mixed radioactive waste liquid adjusted to the predetermined concentration is 1 to 20% by weight, preferably 5 to 10% by weight. When the exchange resin and the anion exchange resin are included, the ratio of the cation exchange resin to the anion exchange resin is preferably about 1: 1.

  In the preparation step, when the weighed solid and water are mixed, this mixing may be performed when supplied to the stirring tank 1 (in the stirring tank 1), before being supplied to the stirring tank 1. It may be mixed in advance.

  The said preparation means comprises the solid substance supply lines 61 and 62, the composition adjustment line 63, and the composition adjustment tank 71 (FIG. 2) and the adjustment liquid supply line 72 (FIG. 2) provided as needed.

  As shown in FIGS. 1 and 2, the composition adjustment line 63 may be coupled only to the stirring tank 1 or the composition adjustment tank 71, and if necessary, the composition adjustment line 63 may be further connected to a solid material supply line. It may be coupled to 61 and / or 62.

  In the preparation means, the solids separated into the solid storage tanks 41 and 51 are weighed so that the amount supplied to the stirring tank 1 is a predetermined amount, and stirred through the solid supply lines 61 and 62, respectively. Supply to tank 1. At this time, water is supplied to the stirring tank 1 through the composition adjustment line 63 so that the waste liquid supplied to the stirring tank 1 has a predetermined concentration.

  Moreover, in the said preparation means, after temporarily storing the solid substance separated into the solid substance storage tanks 41 and 51 and the water supplied via the composition adjustment line 63 in the composition adjustment tank 71 previously, as shown in FIG. Alternatively, the liquid may be supplied to the stirring tank 1 through the adjustment liquid supply line 72.

  As shown in FIG. 2, by providing a flow rate adjusting unit 64 in the solid supply lines 61 and 62, the solids separated in the solid storage tanks 41 and 51 are weighed, and the flow rate adjusting unit 64 is provided in the composition adjusting line 63. By providing, water can be supplied to the stirring tank 1 or the composition adjusting tank 71 so that the waste liquid supplied to the stirring tank 1 has a predetermined concentration.

  In the present invention, the backwashing separation process, the solid material separation process, the preparation process, and the like are also referred to as a “preparation process”.

In the agitation tank 1, the solids supply lines 61 and 62 for supplying the solids to the agitation tank 1 from the solids storage tanks 41 and 51, respectively, and the concentration of solids in the waste liquid supplied to the agitation tank 1 are adjusted. A composition adjustment line 63 is provided.
The stirring tank 1 is further provided with a circulation line 2 so as to communicate the bottom and the side, and a stirring bar for stirring the waste liquid adjusted to a predetermined concentration supplied from the solid substance adjusting device A 3 is provided.

  In the agitation tank 1, the solid-liquid mixed radioactive waste liquid obtained by the solid substance adjusting device A and containing two or more kinds of solids having different specific gravities at a predetermined concentration is agitated by the agitation bar 3 while The waste liquid present in the vicinity is extracted from the bottom of the stirring tank 1, and the extracted waste liquid is supplied into the stirring tank 1 from the side of the stirring tank 1 through the circulation line 2 (stirring step). You may perform a stirring process under heating as needed.

The side of the stirring tank 1 is not particularly limited as long as it is above the bottom of the tank 1, but when a stirring rod with a stirring blade is used, it is preferably above the stirring blade. .
By such a stirring step, the solid-liquid mixed radioactive waste liquid can be stirred substantially uniformly.

The circulation line 2 is preferably provided with a switching unit 4 and, if necessary, a timer measuring means 5 is preferably provided.
The switching unit 4 is preferably a valve with less risk of blockage and less complicated shape in consideration of operability and maintainability in order to prevent solids from accumulating and the circulation line from being blocked. . For example, a butterfly valve, a gate valve, a ball valve, etc. are mentioned. When a globe valve, a needle valve, or the like is used as the switching unit 4, the structure inside the valve is complicated, and solid matter in the waste liquid may be accumulated and blocked.

  The reaction tank 11 is provided with a stirring material supply line 12 for supplying the solid-liquid mixed radioactive waste liquid stirred substantially uniformly in the stirring tank 1 to the reaction tank 11, and the liquid level measuring means 13 and / or It is preferable that a gas discharge measuring means 13 is provided.

  As a method of supplying the substantially uniform stirred solid-liquid mixed radioactive waste liquid obtained in the stirring step to the reaction tank 11, preferably, (i) after a predetermined time is measured by the timer measuring means 5, the stirring tank (Ii) a method of supplying waste liquid after stirring from the stirring tank 1 to the reaction tank 11 based on the measurement result of the liquid level measuring means 13; (Iii) Based on the measurement result of the gas discharge measuring means 13, a method of supplying the waste liquid after stirring from the stirring tank 1 to the reaction tank 11 may be mentioned.

According to the methods (i) to (iii) above, the amount of radioactive liquid waste in the reaction tank 11 can be easily set within a desired range. For this reason, the reaction of the solid substance in the reaction tank 11 occurs sufficiently, and the solid-liquid mixed radioactive waste liquid can be processed in a short time at a low cost.
In order to supply the waste liquid from the stirring tank 1 to the reaction tank 11, for example, the switching unit 4 may be switched.

  In the reaction tank 11, the waste liquid after stirring supplied by the methods (i) to (iii) is reacted. Examples of the reaction include a reaction in which a solid is subjected to wet oxidative decomposition. In the reaction, additives such as hydrogen peroxide and pH adjuster can be added as necessary. The reaction conditions are not particularly limited, but can be carried out at about 100 ° C. under normal pressure.

According to the processing apparatus of the present invention, since the solid-liquid mixed radioactive waste liquid in which the concentration of solid matter is adjusted to a predetermined value and the solid matter is substantially uniformly stirred is supplied to the reaction vessel 11, the reaction vessel When the wet oxidative decomposition reaction or the like is carried out within 11, the problems such as termination of the reaction, insufficient reaction, and excessively intense reaction are unlikely to occur. For this reason, according to the processing apparatus of this invention, radioactive waste liquid can be processed safely in a short time with little generation | occurrence | production amount of a waste body, cheaply.
When processing radioactive waste liquid, since safety | security is calculated | required especially, the processing apparatus of this invention is suitable for the processing of radioactive waste liquid.

≪Method of treating solid-liquid mixed radioactive liquid waste≫
The method for treating a solid-liquid mixed radioactive liquid waste according to the present invention is as follows:
A preparatory step of preparing in advance a solid-liquid mixed radioactive waste liquid containing two or more solids having different specific gravities at a predetermined concentration;
A stirring step of stirring substantially uniformly while circulating the waste liquid having a predetermined concentration obtained in the preparation step;
It is preferable to include a supply step of supplying the waste liquid stirred in the stirring step into the reaction tank.

The preparatory step supplies water from the bottom to the top of the separation tank into the separation tank in which the untreated radioactive liquid waste containing two or more kinds of solids having different specific gravities is stored. The backwash separation step of diffusing and sedimenting the two or more solids, thereby separating the two or more solids in layers in the vertical direction based on the difference in specific gravity in the separation tank,
Solid matter separating step of separating the solids of each of the two or more layers separated into layers by the backwash separation step into individual solid matter storage tanks, and
The solid matter separated in each solid matter storage tank by the solid matter separation step is weighed, and two or more kinds of solids having different specific gravities are mixed at a predetermined concentration by mixing the weighed solid matter and water. And a preparation step of preparing a solid-liquid mixed radioactive liquid waste contained in

  According to such a treatment method, the reaction such as the oxidative decomposition of the radioactive liquid waste can be performed uniformly without causing the reaction to proceed rapidly. For this reason, according to the processing method of the solid-liquid mixed radioactive waste liquid of this invention, there is little generation amount of a waste body and it can process a radioactive waste liquid safely cheaply.

1: Stirring tank 2: Circulation line 3: Stirring rod 4: Switching unit 5: Timer measuring means 11: Reaction tank 12: Stirred substance supply line 13: Liquid level measuring means or gas discharge measuring means 31: Separation tank 32: Separated water Supply line 33: Water storage tank 34: Drainage line 41: First solid substance storage tank 42: First solid substance transfer line 51: Second solid substance storage tank 52: Second solid substance transfer line 61: First Solid supply line 62: Second solid supply line 63: Composition adjustment line 64: Flow rate adjustment unit 71: Composition adjustment tank 72: Preparation liquid supply line 100, 101: Processing device

Claims (6)

A solid substance adjusting device for adjusting a solid-liquid mixed radioactive waste liquid containing two or more kinds of solid substances having different specific gravities to a predetermined concentration;
A circulation line is provided so as to communicate the bottom and the side, and a stirring tank for stirring the waste liquid adjusted to a predetermined concentration supplied from the adjusting device;
A reaction tank for reacting the waste liquid stirred in the stirring tank;
With
The solid-liquid mixed radioactive waste liquid adjusted to a predetermined concentration is introduced into the stirring tank from the adjusting device, and the waste liquid is circulated in the circulation line and stirred substantially uniformly, and then supplied to the reaction tank. A solid-liquid mixed radioactive liquid waste treatment apparatus characterized by that. The solid matter adjusting device is:
A separation tank in which untreated radioactive liquid waste containing two or more solids having different specific gravities is stored;
Water is supplied from below to above into the separation tank in which the untreated radioactive liquid waste is stored, and the two or more kinds of solids are diffused and settled in the separation tank, whereby the two or more kinds of the solid waste are stored. Backwashing separation means for separating solids into layers in the vertical direction based on the difference in specific gravity in the separation tank;
A solids storage tank for separately storing the solids of each of the two or more layers separated into layers by the backwash separation means;
A preparation means for measuring each solid matter allocated to each solid matter storage tank and preparing a solid-liquid mixed radioactive waste liquid containing two or more kinds of solid matters having different specific gravities at a predetermined concentration;
The processing apparatus of the solid-liquid mixed radioactive waste liquid of Claim 1 which has these.   The solid-liquid mixed radioactive liquid according to claim 1 or 2, wherein the solid-liquid mixed radioactive waste liquid contains at least one solid substance selected from the group consisting of filter sludge, granules, incinerated ash, ion exchange resin, and HEPA filter. Waste liquid treatment equipment.   The processing apparatus of the solid-liquid mixed radioactive waste liquid of Claim 3 with which the said solid-liquid mixed radioactive waste liquid contains a cation exchange resin and an anion exchange resin. A preparatory step of preparing in advance a solid-liquid mixed radioactive waste liquid containing two or more solids having different specific gravities at a predetermined concentration;
A stirring step of stirring substantially uniformly while circulating the waste liquid having a predetermined concentration obtained in the preparation step;
Supplying the waste liquid stirred in the stirring step into the reaction tank;
A method for treating a solid-liquid mixed radioactive waste liquid, comprising: The preparation step includes
Water is supplied from the bottom to the top of the separation tank in which the untreated radioactive waste liquid containing two or more kinds of solids having different specific gravity is stored, and the two or more kinds in the separation tank A backwash separation step in which the solids are diffused and settled, thereby separating the two or more kinds of solids into layers in the vertical direction based on the difference in specific gravity in the separation tank;
Solid matter separating step of separating the solids of each of the two or more layers separated into layers by the backwash separation step into individual solid matter storage tanks, and
The solid matter separated in each solid matter storage tank by the solid matter separation step is weighed, and two or more kinds of solids having different specific gravities are mixed at a predetermined concentration by mixing the weighed solid matter and water. A preparation process for preparing a solid-liquid mixed radioactive liquid waste contained in
The processing method of the solid-liquid mixed radioactive waste liquid of Claim 5 which has these.

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