阅读说明：本技术 电驱膜处理高浓盐放射性废液系统及方法 (System and method for treating high-concentrated-salt radioactive waste liquid through electric membrane driving ) 是由 陈定 李志全 何俊旗 于 2019-12-19 设计创作，主要内容包括：本发明公开了一种电驱膜处理高浓盐放射性废液系统及方法,其中系统包括浓水箱、淡水箱和电驱膜设备,浓水箱通过浓水管线与电驱膜设备连接形成浓水循环,淡水箱通过淡水管线与电驱膜设备连接形成淡水循环,浓水箱通过极水管线与电驱膜设备连接形成极水循环。其中方法包括如下步骤：将废液分别泵入浓水箱和淡水箱,使淡水箱中的废液在淡水箱与淡水室之间形成淡水循环,使浓水箱中的废液在浓水箱与浓水室和极水室之间分别形成浓水循环和极水循环,使所述电驱膜设备开始工作,直至废液被处理至目标水平。其目的是为了提供一种电驱膜处理高浓盐放射性废液系统及方法,其能够有效避免极水的污染,从而能够避免产生二次放射性废液。(The invention discloses a system and a method for treating high-concentration radioactive waste liquid by using an electrically-driven membrane, wherein the system comprises a concentrated water tank, a fresh water tank and electrically-driven membrane equipment, the concentrated water tank is connected with the electrically-driven membrane equipment through a concentrated water pipeline to form concentrated water circulation, the fresh water tank is connected with the electrically-driven membrane equipment through a fresh water pipeline to form fresh water circulation, and the concentrated water tank is connected with the electrically-driven membrane equipment through an electrode water pipeline to form electrode water circulation. The method comprises the following steps: and respectively pumping the waste liquid into the concentrated water tank and the fresh water tank, so that fresh water circulation is formed between the fresh water tank and the fresh water chamber by the waste liquid in the concentrated water tank, and concentrated water circulation and polar water circulation are respectively formed between the concentrated water tank and the concentrated water chamber and between the concentrated water chamber and the polar water chamber by the waste liquid in the concentrated water tank, and the electrically-driven membrane equipment starts to work until the waste liquid is treated to a target level. The system and the method for treating the high-concentrated-salt radioactive waste liquid by using the electrically driven membrane can effectively avoid the pollution of polar water, so that secondary radioactive waste liquid can be prevented from being generated.)

1. The utility model provides an electricity drives membrane and handles high strong salt radioactive liquid waste system which characterized in that: including dense water case, fresh water case and electricity drive membrane equipment, dense water case passes through the dense water pipeline and drives the membrane equipment with electricity and be connected and form dense hydrologic cycle, fresh water case passes through the dilute water pipeline and drives the membrane equipment with electricity and be connected and form the freshwater circulations, dense water case passes through utmost point water pipeline and drives the membrane equipment with electricity and be connected and form utmost point hydrologic cycle.

2. The system for treating high concentrated salt radioactive waste liquid by using the electrically driven membrane according to claim 1, is characterized in that: the concentrated water pipeline, the fresh water pipeline and the polar water pipeline are all connected with the emptying pipeline.

3. The system for treating high concentrated salt radioactive waste liquid by using the electrically driven membrane according to claim 2, is characterized in that: the concentrated water pipeline includes first concentrated water pipeline and the concentrated water pipeline of second, first concentrated water pipeline and the concentrated water pipeline of second all connect between concentrated water tank and the concentrated water room of electrically driving membrane equipment, the direction of concentrated water circulation gets back to the concentrated water tank again for starting from the concentrated water tank after concentrated water chamber and the concentrated water pipeline of second through first concentrated water pipeline, electrically driving membrane equipment in proper order, be equipped with concentrated water circulating pump and concentrated water valve on the first concentrated water pipeline, also be equipped with the concentrated water valve on the concentrated water pipeline of second.

4. The system for treating high concentrated salt radioactive waste liquid by using the electrically driven membrane according to claim 3, is characterized in that: the first concentrated water pipeline and the second concentrated water pipeline are respectively provided with a pH sensor, a conductivity sensor and a pressure gauge, the first concentrated water pipeline is further provided with a first flowmeter, and the concentrated water tank is provided with a liquid level sensor.

5. The system for treating high concentrated salt radioactive waste liquid by using the electrically driven membrane according to claim 4, is characterized in that: the fresh water pipeline includes the fresh water pipeline of first fresh water pipeline and second, the fresh water pipeline of first fresh water pipeline and second all connects between fresh water tank and the fresh water room of electrically driving the membrane equipment, fresh water circulation's direction gets back to fresh water tank again for starting from fresh water tank behind fresh water room and the fresh water pipeline of second through first fresh water pipeline, electrically driving the membrane equipment in proper order, be equipped with fresh water circulating pump and fresh water valve on the first fresh water pipeline, also be equipped with the fresh water valve on the fresh water pipeline of second.

6. The system for treating high concentrated salt radioactive waste liquid by using the electrically driven membrane according to claim 5, is characterized in that: the first fresh water pipeline and the second fresh water pipeline are respectively provided with a pH sensor, a conductivity sensor and a pressure gauge, the first fresh water pipeline is provided with a second flowmeter, and the fresh water tank is provided with a liquid level sensor.

7. The system for treating high concentrated salt radioactive waste liquid by using the electrically driven membrane according to claim 6, is characterized in that: the polar water pipeline comprises a first polar water pipeline and a second polar water pipeline, one end of the first polar water pipeline is connected to the first concentrated water pipeline, the other end of the first polar water pipeline is connected to the polar water chamber of the electric membrane driving device, one end of the first polar water pipeline is positioned between the concentrated water circulating pump and the first flowmeter, the concentrated water circulating pump is positioned on a first concentrated water pipeline between one end of the first polar water pipeline and the concentrated water tank, the first flowmeter, the pH sensor, the conductivity sensor and the pressure gauge on the first concentrated water pipeline are positioned between one end of the first polar water pipeline and the electrically-driven membrane device, the second water pole pipeline is connected between the water pole chamber and the concentrated water tank of the electric membrane driving device, and the direction of the water pole circulation is from the concentrated water tank and sequentially goes through a part of the first concentrated water pipeline, the first water pole pipeline, the water pole chamber of the electric membrane driving device and the second water pole pipeline and then returns to the concentrated water tank.

8. The system for treating high concentrated salt radioactive waste liquid by using the electrically driven membrane according to claim 7, is characterized in that: the first polar water pipeline is provided with a polar water valve, a third flow meter, a pressure gauge and a temperature sensor, and the second polar water pipeline is provided with a temperature sensor.

9. The system for treating high concentrated salt radioactive waste liquid by using the electrically driven membrane according to claim 8, is characterized in that: first utmost point water pipeline and second utmost point water pipeline all establish two of parallel arrangement, the utmost point water room of electrically driving membrane equipment establishes to two, every the both ends of utmost point water room are connected with a first utmost point water pipeline and a second utmost point water pipeline respectively, first dense water pipeline, first light water pipeline and first utmost point water pipeline all with the evacuation pipe connection, be equipped with the evacuation valve on the evacuation pipe.

10. An electrically-driven membrane treatment method for high-concentrated-salt radioactive waste liquid is characterized by comprising the following steps:

respectively pumping the waste liquid to be treated into a concentrated water tank and a fresh water tank,

a fresh water circulating pump is started to ensure that the waste liquid in the fresh water tank forms fresh water circulation between the fresh water tank and the fresh water chamber of the electrically driven membrane device,

opening a concentrated water circulating pump, adjusting a concentrated water valve and an electrode water valve to distribute water quantity, enabling waste liquid in the concentrated water tank to respectively form concentrated water circulation and electrode water circulation between the concentrated water tank and a concentrated water chamber and an electrode water chamber of the electric membrane driving device,

and turning on a power supply of the electrically-driven membrane device to enable the electrically-driven membrane device to start working until the waste liquid in the concentrated water tank and the waste liquid in the fresh water tank are treated to a target level.

Technical Field

The invention relates to the field of waste liquid treatment, in particular to a system and a method for treating high-concentration radioactive waste liquid.

Background

The electric membrane-driving technology utilizes the selective permeability of an ion exchange membrane to enable charged ions to be generated under the action of a direct-current electric fieldThe process of raw directional migration has the obvious characteristics of low energy consumption, high efficiency and the like, and electrodialysis is a common electric membrane driving technology. In radioactive waste liquid treatment, the electric membrane-driving technology has been partially applied in laboratories, for example, China radiation protection research institute has used two-stage circulation electrodialysis equipment to treat simulated waste liquid with NaCl content of 4.68% in radioactive waste incineration process, and finally obtained fresh water has salt concentration of only 186 mg.L^-1The salt content in the concentrated solution is up to 86 g.L^-1。

The structure of the electric membrane driving device mainly based on electrodialysis can be divided into a concentrated water chamber, a fresh water chamber and an electrode water chamber, the working principle of the electric membrane driving device is shown in figure 1, under the action of an applied direct current electric field, ions migrate to an electrode with opposite charges, and cations (+) are blocked by an anion exchange membrane A in the migration process to the electrode; while the anion (one) will be blocked by the cation exchange membrane C. The result is a concentrated solution of ions on one side of the membrane and a dilute solution of ions on the other side. The feed liquid flows through the concentrated water chamber and then becomes concentrated liquid, the feed liquid flows through the fresh water chamber and then becomes desalted liquid, and the polar water chamber flows through the electrode liquid (also called polar water).

The electrolyte used in the conventional electrically driven membrane device is a sodium sulfate solution which circulates in the polar water chamber during the treatment of the conventional waste liquid, takes away the heat generated by the plates and provides sufficient ionic strength for the current transfer process. However, since the polar water chamber is separated from the fresh water chamber and the concentrated water chamber only by the ion exchange membrane, the migration of target ions to be treated in the feed liquid into the polar water is inevitable during the operation process, and if the migrated ions are nuclide ions, the radioactive contamination of the polar water is caused, and the polar water becomes secondary radioactive waste liquid.

Disclosure of Invention

The invention aims to solve the technical problem of providing an electric-driven membrane treatment system and method for high-concentration salt radioactive waste liquid, which can effectively avoid the pollution of polar water, so that secondary radioactive waste liquid can be avoided.

The system for treating the high-concentration-salt radioactive waste liquid by the electrically-driven membrane comprises a concentrated water tank, a fresh water tank and electrically-driven membrane equipment, wherein the concentrated water tank is connected with the electrically-driven membrane equipment through a concentrated water pipeline to form concentrated water circulation, the fresh water tank is connected with the electrically-driven membrane equipment through a fresh water pipeline to form fresh water circulation, and the concentrated water tank is connected with the electrically-driven membrane equipment through an electrode water pipeline to form electrode water circulation.

The system for treating the high-concentrated-salt radioactive waste liquid by the electrically driven membrane is characterized in that the concentrated water pipeline, the fresh water pipeline and the polar water pipeline are connected with an emptying pipeline.

The system for treating the high-concentrated-salt radioactive waste liquid by the electric membrane driving comprises a concentrated water pipeline and a concentrated water pipeline, wherein the concentrated water pipeline comprises a first concentrated water pipeline and a second concentrated water pipeline, the first concentrated water pipeline and the second concentrated water pipeline are connected between a concentrated water tank and a concentrated water chamber of the electric membrane driving device, the concentrated water circulates in a direction from the concentrated water tank to the concentrated water tank after sequentially passing through the first concentrated water pipeline, the concentrated water chamber of the electric membrane driving device and the second concentrated water pipeline, a concentrated water circulating pump and a concentrated water valve are arranged on the first concentrated water pipeline, and a concentrated water valve is also arranged on the second concentrated water pipeline.

According to the system for treating the high-concentration radioactive waste liquid by the electrically-driven membrane, the first concentrated water pipeline and the second concentrated water pipeline are respectively provided with the pH sensor, the conductivity sensor and the pressure gauge, the first concentrated water pipeline is further provided with the first flowmeter, and the concentrated water tank is provided with the liquid level sensor.

The system for treating the high-concentrated-salt radioactive waste liquid by the electrically-driven membrane comprises a fresh water pipeline, a fresh water circulating pump, a fresh water valve and a fresh water valve, wherein the fresh water pipeline comprises a first fresh water pipeline and a second fresh water pipeline, the first fresh water pipeline and the second fresh water pipeline are both connected between a fresh water tank and a fresh water chamber of the electrically-driven membrane device, the fresh water circulates in a direction from the fresh water tank to the fresh water tank after sequentially passing through the first fresh water pipeline, the fresh water chamber of the electrically-driven membrane device and the second fresh water pipeline, the first fresh water pipeline is provided with the fresh water circulating pump and the fresh water valve, and the second fresh water pipeline is also provided with the fresh water valve.

According to the system for treating the high-concentrated-salt radioactive waste liquid by the electrically-driven membrane, the first fresh water pipeline and the second fresh water pipeline are respectively provided with the pH sensor, the conductivity sensor and the pressure gauge, the first fresh water pipeline is provided with the second flowmeter, and the fresh water tank is provided with the liquid level sensor.

The system for treating the high-concentration radioactive waste liquid by the electrically-driven membrane comprises an electrode water pipeline, a first electrode water pipeline and a second electrode water pipeline, wherein one end of the first electrode water pipeline is connected to the first concentrated water pipeline, the other end of the first electrode water pipeline is connected to an electrode water chamber of the electrically-driven membrane equipment, one end of the first electrode water pipeline is located between a concentrated water circulating pump and a first flowmeter, the concentrated water circulating pump is located on the first concentrated water pipeline between one end of the first electrode water pipeline and a concentrated water tank, the first flowmeter, a pH sensor, a conductivity sensor and a pressure gauge on the first concentrated water pipeline are located between one end of the first electrode water pipeline and the electrically-driven membrane equipment, the second electrode water pipeline is connected between the electrode water chamber and the concentrated water tank of the electrically-driven membrane equipment, and the direction of the electrode water circulation is that the electrode water passes through a part of the first concentrated water pipeline from the concentrated water tank in sequence, The first polar water pipeline, the polar water chamber of the electric membrane driving device and the second polar water pipeline return to the concentrated water tank.

The electrically-driven membrane treatment system for the high-concentration-salt radioactive waste liquid comprises a first polar water pipeline, a second polar water pipeline, a third flow meter, a pressure meter and a temperature sensor, wherein the first polar water pipeline is provided with a polar water valve, the third flow meter, the pressure meter and the temperature sensor, and the second polar water pipeline is provided with the temperature sensor.

The system for treating the high-concentrated-salt radioactive waste liquid by using the electrically-driven membrane comprises a first polar water pipeline and a second polar water pipeline, wherein the first polar water pipeline and the second polar water pipeline are arranged in parallel, two polar water chambers of the electrically-driven membrane equipment are arranged, two ends of each polar water chamber are respectively connected with the first polar water pipeline and the second polar water pipeline, the first concentrated water pipeline, the first dilute water pipeline and the first polar water pipeline are connected with an emptying pipeline, and the emptying pipeline is provided with an emptying valve.

The method for treating the high-concentrated-salt radioactive waste liquid by using the electrically driven membrane comprises the following steps of:

respectively pumping the waste liquid to be treated into a concentrated water tank and a fresh water tank,

a fresh water circulating pump is started to ensure that the waste liquid in the fresh water tank forms fresh water circulation between the fresh water tank and the fresh water chamber of the electrically driven membrane device,

opening a concentrated water circulating pump, adjusting a concentrated water valve and an electrode water valve to distribute water quantity, enabling waste liquid in the concentrated water tank to respectively form concentrated water circulation and electrode water circulation between the concentrated water tank and a concentrated water chamber and an electrode water chamber of the electric membrane driving device,

and turning on a power supply of the electrically-driven membrane device to enable the electrically-driven membrane device to start working until the waste liquid in the concentrated water tank and the waste liquid in the fresh water tank are treated to a target level.

Compared with the prior art, the system and the method for treating the high-concentration salt radioactive waste liquid by the electrically-driven membrane are different in that concentrated liquid (namely waste liquid in a concentrated water tank) is used as polar water, and the method can effectively avoid pollution of the polar water, so that secondary radioactive waste liquid is avoided.

The invention will be further explained with reference to the drawings.

Drawings

FIG. 1 is a schematic diagram of the operation of an electrically driven membrane device of the prior art;

FIG. 2 is a schematic diagram of the structure of the system for treating the high-concentration salt radioactive waste liquid by using the electrically driven membrane in the invention;

FIG. 3 is a flow chart of the method for treating high concentrated salt radioactive waste liquid by using an electrically driven membrane in the present invention.

Detailed Description

As shown in fig. 2, the system for treating high concentrated salt radioactive waste liquid by using an electrically-driven membrane in the present invention comprises a concentrated water tank 2, a fresh water tank 14 and an electrically-driven membrane device 9, wherein the concentrated water tank 2 is connected with the electrically-driven membrane device 9 through a concentrated water pipeline to form a concentrated water cycle, the fresh water tank 14 is connected with the electrically-driven membrane device 9 through a fresh water pipeline to form a fresh water cycle, and the concentrated water tank 2 is connected with the electrically-driven membrane device 9 through an electrode water pipeline to form an electrode water cycle.

The system for treating the high-concentration radioactive waste liquid by the electrically driven membrane is characterized in that a concentrated water pipeline, a fresh water pipeline and a polar water pipeline are connected with an emptying pipeline 20.

The system for treating the high-concentrated-salt radioactive waste liquid by the electric membrane driving comprises a concentrated water pipeline 4 and a second concentrated water pipeline 10, wherein the concentrated water pipeline 4 and the second concentrated water pipeline 10 are both connected between a concentrated water tank 2 and a concentrated water chamber of an electric membrane driving device 9, the concentrated water circulates in a direction from the concentrated water tank 2, sequentially passes through the concentrated water pipeline 4, the concentrated water chamber of the electric membrane driving device 9 and the second concentrated water pipeline 10 and then returns to the concentrated water tank 2, a concentrated water circulating pump 3 and a concentrated water valve are arranged on the first concentrated water pipeline 4, and a concentrated water valve is also arranged on the second concentrated water pipeline 10.

According to the system for treating the high-concentration radioactive waste liquid by the electrically-driven membrane, the first concentrated water pipeline 4 and the second concentrated water pipeline 10 are respectively provided with the pH sensor 6, the conductivity sensor 7 and the pressure gauge 8, the first concentrated water pipeline 4 is also provided with the first flowmeter 5, and the concentrated water tank 2 is provided with the liquid level sensor 1.

The electrically-driven membrane treatment system for the high-concentrated-salt radioactive waste liquid comprises a fresh water pipeline and a membrane driving device 9, wherein the fresh water pipeline comprises a first fresh water pipeline 12 and a second fresh water pipeline 15, the first fresh water pipeline 12 and the second fresh water pipeline 15 are both connected between the fresh water tank 14 and a fresh water chamber of the electrically-driven membrane driving device 9, the fresh water circulates in the direction from the fresh water tank 14 to the fresh water tank 14 after sequentially passing through the first fresh water pipeline 12, the fresh water chamber of the electrically-driven membrane driving device 9 and the second fresh water pipeline 15, the fresh water circulates in the fresh water chamber 14, a fresh water circulating pump 13 and a fresh water valve are arranged on the first fresh water pipeline 12, and a fresh water valve is also arranged on the second fresh water pipeline 15.

The system for treating the high-concentrated-salt radioactive waste liquid by the electrically-driven membrane comprises a first fresh water pipeline 12, a second fresh water pipeline 15, a pH sensor 6, a conductivity sensor 7 and a pressure gauge 8, wherein the first fresh water pipeline 12 is provided with a second flowmeter 11, and a fresh water tank 14 is provided with a liquid level sensor 1.

The system for treating high-concentration radioactive waste liquid by using the electrically driven membrane comprises a first polar water pipeline 16 and a second polar water pipeline 19, wherein one end of the first polar water pipeline 16 is connected to a first concentrated water pipeline 4 (namely, one end of the first polar water pipeline 16 is connected with a concentrated water tank 2 through the first concentrated water pipeline 4), the other end of the first polar water pipeline 16 is connected to the polar water chamber of the electrically driven membrane device 9, one end of the first polar water pipeline 16 is positioned between a concentrated water circulating pump 3 and a first flowmeter 5, the concentrated water circulating pump 3 is positioned on the first concentrated water pipeline 4 between one end of the first polar water pipeline 16 and the concentrated water tank 2, a first flowmeter 5, a pH sensor 6, a conductivity sensor 7 and a pressure gauge 8 on the first concentrated water pipeline 4 are positioned between one end of the first polar water pipeline 16 and the electrically driven membrane device 9, the second polar water pipeline 19 is connected between the polar water chamber of the electrically driven membrane device 9 and the concentrated water tank 2, the direction of the polar water circulation is from the concentrated water tank 2 to the concentrated water tank 2 after sequentially passing through a part of the first concentrated water pipeline 4, the first polar water pipeline 16, the polar water chamber of the electric membrane driving device 9 and the second polar water pipeline 19.

The system for treating the high-concentrated-salt radioactive waste liquid by using the electrically-driven membrane is characterized in that a polar water valve, a third flow meter 17, a pressure gauge 8 and a temperature sensor 18 are arranged on the first polar water pipeline 16, and a temperature sensor 18 is arranged on the second polar water pipeline 19.

In the system for treating high-concentration radioactive waste liquid by using the electrically-driven membrane, the first polar water pipeline 16 and the second polar water pipeline 19 are arranged in parallel, the electrically-driven membrane equipment 9 has two polar water chambers, two ends of each polar water chamber are respectively connected with the first polar water pipeline 16 and the second polar water pipeline 19, the first concentrated water pipeline 4, the first dilute water pipeline 12 and the first polar water pipeline 16 are connected with the evacuation pipeline 20, and the evacuation pipeline 20 is provided with an evacuation valve.

The concentrated water valve, the fresh water valve and the polar water valve are used for adjusting the circulating flow and distributing the circulating water quantity.

The flowmeter is used for monitoring circulation flow data and adjusting the flow by matching with a thick water valve, a fresh water valve and an extreme water valve.

The pH sensor 6, the conductivity sensor 7 and the pressure gauge 8 in the invention are conventional monitoring means and are used for judging the operation condition of the electric membrane driving device 9.

The temperature sensor 18 is used for monitoring the change condition of the polar water temperature, and once the polar water temperature is abnormally fluctuated, the temperature sensor gives an alarm to prompt and even stops the equipment, so that potential danger is avoided.

As shown in FIG. 3, the method for treating high concentrated salt radioactive waste liquid by using an electrically driven membrane comprises the following steps:

the waste liquid to be treated is pumped into the concentrated water tank 2 and the fresh water tank 14 respectively,

the fresh water circulating pump 13 is opened to enable the waste liquid in the fresh water tank 14 to form fresh water circulation between the fresh water tank 14 and the fresh water chamber of the electrically membrane driving device 9,

opening a concentrated water circulating pump 3, adjusting a concentrated water valve and an electrode water valve to distribute water quantity, enabling waste liquid in the concentrated water tank 2 to respectively form concentrated water circulation and electrode water circulation between the concentrated water tank 2 and a concentrated water chamber and an electrode water chamber of an electric membrane driving device 9,

the power supply of the electrically driven membrane device 9 is turned on, and the electrically driven membrane device 9 is started to operate until the waste liquid in the concentrated water tank 2 and the waste liquid in the fresh water tank 14 are treated to a target level.

The method utilizes the concentrated solution (namely the waste liquid in the concentrated water tank 2) as the polar water (namely the electrode liquid), and can effectively avoid the pollution of the polar water, thereby avoiding the generation of secondary radioactive waste liquid.

The invention utilizes the concentrated solution in the concentrated water tank 2 (namely the waste liquid in the concentrated water tank 2) as the electrode plate electrode water to replace the original electrode water, thereby avoiding the pollution of radioactive substances to the original electrode water in the circulating process and further avoiding the generation of secondary radioactive waste liquid. The concentrated solution can be used for replacing polar water, the concentration of the concentrated solution is required to reach a higher level firstly, sufficient current density can be provided, and the concentrated solution is required not to contain ionic components which are easy to deposit on an electrode plate and cause electrode poisoning.

Because the radioactive waste liquid is treated in sequence and batch, the circulation mode in the invention can effectively avoid the temperature rise of the polar water, and can further cancel a heat exchange device for cooling the polar water, so that the system is simpler.

In the present invention, the volumes of radioactive waste liquid in the fresh water tank 14 and the thick water tank 2 are set according to a target concentration multiple, for example, when the target concentration multiple is 10, the volume ratio of the thick water tank 2 to the fresh water tank 14 is 1: 10. Generally, it is necessary to ensure that the flow rates of the concentrate and the fresh water are consistent. It should be noted that the present invention is only applicable to the treatment of radioactive waste liquid which does not contain high content of easily deposited or high content of easily produced polar plate poisoning.

The invention has the beneficial effects that: the invention can effectively avoid the generation of secondary radioactive waste liquid caused by using polar water represented by sodium sulfate.

The following description will be made by taking as an example a radioactive waste liquid containing 0.1mol/L nitric acid in concentration:

as shown in FIG. 2, waste liquid is first injected into the concentrated water tank 2 and the fresh water tank 14, respectively, and the volumes of the waste liquid in the concentrated water tank 2 and the fresh water tank 14 are 1m, respectively³And 10m³. Then a fresh water circulating pump 13 is opened, and the fresh water flow is adjusted to be 10m³H, opening the concentrated water circulating pump 3, and adjusting the circulating flow of the concentrated water to be 10m³The circulating flow rates of the two electrode water chambers are both 1.5m³H is used as the reference value. Then the power supply of the electric membrane driving device 9 is turned on to perform waste liquid treatment.

As the operation time increases, the conductivity sensor 7 and the pH sensor 6 can be used together to determine whether the waste liquid treatment end point is reached. After the normal operation is carried out for 5 hours, the concentration of the nitric acid in the fresh water in the standard-reaching waste liquid is 0.01mol/L, and the concentration of the nitric acid in the concentrated water is 1 mol/L.

In the operation process, the temperature of the inlet and outlet thermometers of the polar water chamber can detect the weak temperature difference which is lower than 1 ℃, and when the polar water returns to the concentrated water tank 2, the heat is further consumed. When the batch of radioactive waste liquid is treated in a normal order, the waste liquid can be treated for 5 hours until reaching the standard level, namely 1m³The temperature of the concentrated solution is not higher than 5 ℃ and is within an acceptable range.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.