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Method and device for processing radioactive wastewater

A technology for radioactive wastewater and treatment methods, which is applied in radioactive purification, radioactive pollutants, water/sewage treatment, etc.

Active Publication Date: 2014-04-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the current technical conditions at home and abroad, although the radioactive wastewater membrane treatment system has a high decontamination factor, its low concentration factor (usually only 5-10) limits its wide application
At the same time, the strict requirements of the conventional reverse osmosis membrane treatment system on the influent also severely limit its use. If pretreatment such as diatomaceous earth filtration is used, the generation of solid waste will be greatly increased.

Method used

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  • Method and device for processing radioactive wastewater
  • Method and device for processing radioactive wastewater
  • Method and device for processing radioactive wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Start the raw water supply pump, and send 10 tons of wastewater with a salt content of 5g / L and a total beta activity of 50,000Bq / L (the maximum level that the concentration of radioactive wastewater from nuclear power plants and nuclear facilities may reach) Figure 2B The device shown performs processing.

[0043] Fully open the concentrated water outlet valve of the first-stage membrane module, start the first-stage high-pressure pump (frequency conversion control, frequency conversion frequency 50Hz), start the first-stage circulating pump with a delay of 3 minutes, and adjust the concentrated water outlet valve of the first-stage membrane module Make the outlet pressure of the first stage high pressure pump reach 5.5MPa. Fully open the concentrated water outlet valve of the second-stage membrane module, start the second-stage high-pressure pump, start the second-stage circulating pump (frequency conversion control, frequency conversion frequency 50Hz) with a delay of 3...

Embodiment 2

[0048] According to the equipment and operating conditions used in Example 1, 10 tons of wastewater with a salt content of 5 g / L and a total beta activity of 10000 Bq / L were treated.

[0049] After treatment, the total beta activity of the clean water discharged from the first-stage membrane module is 100Bq / L, the activity of the clean water discharged from the second-stage membrane module is 2Bq / L, and the decontamination factor of the two-stage membrane system is 5000. The volume of the concentrated liquid that needs to be cemented is 0.4 cubic meters (with a salt content of 125g / L), so the concentration of radioactive waste water in the entire process is 25 times.

[0050] If the clean water discharged from the second-stage membrane module is sent to the ion exchanger for further processing, the total volume of clean water that can be obtained is 9.6 tons, and the final total β activity of the clean water is 0.1Bq / L, so the entire process is depleted. The pollution factor is 100...

Embodiment 3

[0053] According to the device and operating conditions used in Example 1, 10 tons of wastewater with a salt content of 5 g / L and a total beta activity of 5000 Bq / L were treated.

[0054] After treatment, the total beta activity of the clean water discharged from the first-stage membrane module is 50Bq / L, the activity of the clean water discharged from the second-stage membrane module is 1Bq / L, and the decontamination factor of the two-stage membrane system is 5000. The volume of the concentrated liquid that needs to be cemented is 0.4 cubic meters (with a salt content of 125g / L), so the concentration of radioactive waste water in the entire process is 25 times.

[0055] If the clean water discharged from the second-stage membrane module is sent to the ion exchanger for further treatment, the total volume of clean water that can be obtained is 9.6 tons, and the total β activity of the final clean water is 0.05Bq / L, so the entire process is depleted. The pollution factor is 100000. ...

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Abstract

The invention provides a method and a device for processing radioactive wastewater. According to the method and the device, the radioactive wastewater is processed by a disk tubular reverse osmosis (DTRO) membrane component, so that effects of efficient decontamination factors and high cycles of concentration can be obtained at the same time. The method comprises the steps of enabling the radioactive wastewater to flow through a first-level membrane component and a second-level membrane component in sequence to obtain second-level water; and enabling first-level concentrated water out of the first-level membrane component to enter a third-level membrane component and obtain a concentrated solution.

Description

Technical field [0001] The invention relates to radioactive waste water treatment, in particular to a method and a device for treating radioactive waste water through dish tube reverse osmosis membrane technology. Background technique [0002] For radioactive waste water produced in the nuclear industry, flocculation and sedimentation, sand filtration, diatomite filtration, ultrafiltration, selective ion exchange, reverse osmosis membrane treatment, evaporation, and electrodialysis are all common methods to treat them. [0003] Each treatment method has its scope of application and technical characteristics. The current research mainly focuses on the research of different treatment methods on the decontamination efficiency of radioactive wastewater in the case of reactor core melting, and select the applicable radioactive wastewater based on the treatment flow and process characteristics. Processing technology. [0004] The focus of radioactive wastewater treatment technology is to ...

Claims

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Application Information

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IPC IPC(8): G21F9/06
CPCC02F1/441C02F9/00G21F9/06C02F1/42C02F1/001C02F1/66C02F1/444C02F1/4693C02F2101/006B01D61/08B01D63/084C02F11/008B01D2311/04B01D2311/06B01D2311/18B01D2311/2623B01D2311/2649B01D2311/2684B01D2317/022B01D2317/025B01D2317/06C02F2301/046B01D61/14B01D61/58B01D2311/24B01D61/026B01D2311/2523
Inventor 李俊峰王建龙
Owner TSINGHUA UNIV
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