Method and system for decrement of concentrated solution in nuclear industry

A concentrate and nuclear industry technology, applied in the field of nuclear industry concentrate reduction, can solve the problems of affecting the treatment efficiency, reducing the decontamination factor, and high energy consumption

Active Publication Date: 2014-09-03
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Evaporators have been in service in the nuclear industry for many years, and there have been many problems during use, such as h...

Method used

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  • Method and system for decrement of concentrated solution in nuclear industry
  • Method and system for decrement of concentrated solution in nuclear industry
  • Method and system for decrement of concentrated solution in nuclear industry

Examples

Experimental program
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Embodiment 1

[0026] like figure 1 Shown, a kind of method that is used for nuclear industry concentrate reduction, concrete steps are as follows:

[0027] 1) Concentration by electrodialysis: the pH value is 6-9, the salt content is 15-20g / L, and the radioactive level is 3.7×10 4 Bq / L nuclear industry radioactive wastewater is treated by electrodialysis to obtain electrodialysis concentrate and electrodialysis purification solution; among them, the main ions of nuclear industry radioactive wastewater include sodium, chloride, magnesium, calcium, sulfate, strontium, cesium, cobalt, silver etc.

[0028] 2) Forward osmosis concentration: The electrodialysis concentrated solution is separated and treated by forward osmosis technology; after forward osmosis, the forward osmosis purification solution and the forward osmosis concentration solution are returned to step 1) the electrodialysis process, the forward osmosis purification solution is combined with the The electrodialysis purification...

Embodiment 2

[0039] like figure 2Shown, a kind of system that is used for nuclear industry concentrate reduction, it comprises electrodialysis unit and forward osmosis unit, electrodialysis unit comprises waste water treatment chamber, and waste water treatment chamber two ends are respectively provided with cathode 15 and anode 11, from cathode to Anion exchange membranes 25 and cation exchange membranes 21 are alternately arranged between the anodes, and the alternately arranged anion exchange membranes 25 and cation exchange membranes 21 divide the wastewater treatment chamber into several small chambers; nuclear industry waste liquid enters each small chamber through pipelines Finally, under the action of a direct current electric field, the ions migrate in a directional manner, and the positive and negative ions are intercepted by the anion exchange membrane 25 and the cation exchange membrane 21 respectively, so that the several small chambers are differentiated to form an electrodia...

Embodiment 3

[0045] like image 3 As shown, this embodiment is basically the same as Embodiment 2, the difference is that the forward osmosis device includes a forward osmosis membrane, a drawing unit 60 and a draw solution recovery unit, and the water outlet A arranged on the draw solution recovery unit passes through the pipeline and the fresh water chamber 30 connection; the drawing unit 60 is set in the concentrated water chamber 40, and the forward osmosis membrane 65 of the drawing unit 60 is directly in contact with the electrodialysis concentrate in the concentrated water chamber. The drawing unit 60 can be cylindrical, spherical, rectangular and other shapes surrounded by the forward osmosis membrane 65. The upper and lower sides of the drawing unit are respectively provided with inlets and outlets for the forward osmosis drawing liquid. The water chamber draws fresh water, and the fresh water is separated out in the drawing solution recovery unit and returns to the fresh water ch...

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Abstract

The invention discloses a method for decrement of a concentrated solution in the nuclear industry. The method specifically comprises the following steps: carrying out electroosmosis on radioactive wastewater in the nuclear industry to obtain an electroosmosis concentrated solution and an electroosmosis purified solution, wherein the PH value is 6-9, the saltness is 15-20g/L and the radioactive level is 3.7*10<4>Bq/L; separating the electroosmosis concentrated solution by a forward osmosis technology; returning a forward osmosis purified solution and a forward osmosis concentration solution after forward osmosis to an electroosmosis process, mixing the forward osmosis purified solution with the electroosmosis purified solution, and mixing the forward osmosis concentration solution with the electroosmosis concentrated solution; and synchronously and circularly carrying the above steps till the radioactive level of the electroosmosis purified solution is not higher than 60Bq/L, then, directly discharging the electroosmosis purified solution and exporting the electroosmosis concentrated solution for subsequent treatment. Through the coupling manner, the treatment efficiency of nuclear wastewater can be greatly improved, and the liquid level pressure difference deltah of a fresh water chamber and a concentrated water chamber is enlarged, so that positive and negative ions permeate to the concentrated water chamber more quickly.

Description

technical field [0001] The invention relates to the technical field of nuclear waste treatment, in particular to a method and system for nuclear industry concentrate reduction. Background technique [0002] The nuclear industry concentrate generally refers to the high-salt concentrated part of the radioactive wastewater in the nuclear industry that is produced after membrane separation processes such as reverse osmosis, except for the fresh water that meets the standard discharge. The concentrated liquid in the nuclear industry is generally processed by an evaporator to obtain a further concentrated distilled raffinate, and then it is mostly treated with temporary storage or cement solidification. However, the volume increase of cement solidification is relatively high, which not only occupies the storage space of the temporary storage, but also increases the final disposal cost. Therefore, it is imperative to reduce the nuclear industry concentrate, which not only conforms...

Claims

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Application Information

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IPC IPC(8): G21F9/12
Inventor 章真怡赵璇
Owner TSINGHUA UNIV
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