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A method and system for concentrating radioactive wastewater

A technology of radioactive waste water and concentration tank, which is applied in radioactive purification, nuclear engineering, etc., can solve the problems of high energy consumption, huge equipment, poor operating conditions, etc., and achieve the effect of simple and compact process

Active Publication Date: 2016-06-08
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are: high energy consumption; large amount of radioactive waste resin; huge equipment, high investment, poor operating conditions, serious problems such as corrosion and scaling
Reverse osmosis and nanofiltration technologies can remove ionic nuclide ions, but they have higher requirements for influent water quality

Method used

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  • A method and system for concentrating radioactive wastewater
  • A method and system for concentrating radioactive wastewater
  • A method and system for concentrating radioactive wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] like figure 1 As shown, the concentrated radioactivity level is 7000Bq / L, and the radioactive wastewater concentration method with a salt content of 2g / L.

[0042](1) When the system is started, the membrane modules are automatically flushed with non-radioactive water, and then enter the normal working procedure.

[0043] (2) Pre-treatment of radioactive wastewater: Ultrafiltration removes suspended solids, colloids and other impurities in radioactive wastewater, and the treated radioactive wastewater enters the raw material tank.

[0044] In addition, this process can also use technologies such as microfiltration and sand filtration to remove impurities such as suspended solids and colloids.

[0045] (3) The pre-treated radioactive wastewater is introduced into the reverse osmosis concentration unit for reverse osmosis concentration, the concentrated solution with intercepted radioactive elements is introduced into the concentration tank, and the infiltrated clean wat...

Embodiment 2

[0057] The radioactive wastewater treated in this embodiment has a radioactivity level of 5000Bq / L and a salt content of 1g / L.

[0058] Concentration procedure is substantially the same as Example 1, except that:

[0059] (1) The reverse osmosis concentration unit adopts a two-stage reverse osmosis membrane system. The first-stage reverse osmosis system is divided into three sections, and the total recovery rate of the reverse osmosis system is 80%. The fresh water radioactivity of the two-stage reverse osmosis system is 150Bq / L and 50Bq / L respectively, and the fresh water produced by the last-stage membrane system is discharged. The concentrate produced by the first-stage reverse osmosis system all enters the concentration tank, with a salt content of about 5g / L.

[0060] (2) The heating temperature of the concentrate in the concentration tank is controlled at 55 degrees, and the circulation flow rate of a single membrane module in the membrane distillation concentration uni...

Embodiment 3

[0064] The radioactivity level of the radioactive wastewater treated in this embodiment is 3000Bq / L, and the radioactive wastewater with a salt content of 3g / L.

[0065] Concentration process is basically the same as embodiment, difference is:

[0066] (1) The reverse osmosis concentration unit adopts a three-stage reverse osmosis membrane system, the first-stage reverse osmosis system is divided into three sections, and the total recovery rate of the reverse osmosis system is 70%. The fresh water radioactivity of the three-stage reverse osmosis is 100Bq / L, 50Bq / L, and 10Bq / L respectively, and the fresh water produced by the last-stage membrane system is discharged. The concentrate produced by the first-stage reverse osmosis system all enters the concentration tank, with a salt content of about 9g / L.

[0067] (2) The heating temperature of the concentrate in the concentration tank is controlled at 60 degrees, and the circulation flow rate of a single membrane module in the me...

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Abstract

The invention discloses a method for concentrating radioactive waste water. The method comprises the following steps: introducing the radioactive waste water into a reverse osmosis concentration unit for reverse osmosis preliminary concentration; The concentrate is introduced into the membrane distillation unit for deep concentration; the concentration tank is equipped with a conductivity probe for measuring the conductivity of the concentrate, and when the conductivity in the concentration tank is higher than the set conductance threshold, stop introducing the reverse osmosis concentrate into the concentration Tank, and stop the membrane distillation concentration of the membrane distillation concentration unit, and then export the concentrated solution in the concentration tank for solidification treatment. Compared with the prior art, the present invention uses reverse osmosis+membrane distillation as the core of a novel method for concentrating radioactively contaminated wastewater, which can realize the deep concentration of reverse osmosis concentrated liquid, further reduce the volume of radioactive waste liquid, and its concentration ratio can reach that of evaporation The process is at a similar level, and the energy consumption is only 30-50% of that of the evaporation process.

Description

technical field [0001] The invention relates to a sewage treatment technology, in particular to a method for concentrating radioactive wastewater in the nuclear industry; in addition, the invention also relates to a system for treating radioactive wastewater using the method. Background technique [0002] The main goal of radioactive wastewater treatment is to reduce the amount of radioactive waste as much as possible. No matter which treatment method is adopted, the radionuclide is actually concentrated and enriched into a very small volume of liquid medium or solid medium, and most of the liquid meets the relevant requirements before being cleared. Concentrate the liquid medium enriched with radionuclides, such as the concentrated water of the membrane process, and the distilled residue of the evaporation process. Solid media such as ion exchange resins. These materials end up as radioactive waste for long-term geological storage. An important principle of radioactive w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21F9/06G21F9/04
Inventor 赵璇章真怡李福志
Owner TSINGHUA UNIV
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