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Method for treating radioactive wastewater

一种放射性废水、放射性核素的技术，应用在处理放射性废水领域，能够解决投资高、能耗高、设备庞大等问题，达到提高去除效率、处理精度高、提高利用率的效果

Active Publication Date: 2013-06-26
BEIJING QINGHE CHAOHUA TECH CO LTD
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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
At present, the continuous electrostatic desalination technology at home and abroad is aimed at removing strong and weak dielectrics in water and producing high-quality ultrapure water, which cannot be directly applied to the treatment of radioactive wastewater in the nuclear industry.
This is because: in radioactive wastewater, the concentration of nuclide ions is often 4-5 orders of magnitude lower than that of conventional non-radioactive ions, and the resin filled in commercial continuous electrostatic desalination membrane stacks has no strong selection for radionuclides Most of the current is used for the removal of non-radioactive ions in water, the removal efficiency of nuclide ions is not high, the effective current utilization rate is low, and the water quality of fresh water effluent cannot meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The method is used to treat radioactive waste water with a radioactivity level of 7000Bq / L and a conductivity of 850μS / cm. When the system is turned on, the membrane module is automatically flushed and enters the normal working procedure. When the system is out of service, use non-radioactive water or fresh water generated by the system for online flushing. The radioactive wastewater first passes through the security filter and the ultrafiltration unit, and the effluent enters the first-stage reverse osmosis. The volume ratio of fresh water and concentrated water produced by the first-stage reverse osmosis is controlled at 5:1, and the conductivity of the fresh water is 40 μS / cm. It enters the second-stage reverse osmosis, and the concentrated water enters the inverted electrodialysis unit. The volume ratio of fresh water and concentrated water in the secondary reverse osmosis is controlled at 5:1, the concentrated water is returned to the primary reverse osmosis unit,...

Embodiment 2

[0040] The method was used to treat radioactive wastewater with a radioactive activity level of 7000Bq / L and a conductivity of 850μS / cm. When the system is turned on, the membrane module is automatically flushed and enters the normal working procedure. When the system is out of service, use non-radioactive water or fresh water generated by the system for online flushing. The radioactive wastewater first passes through the security filter and the ultrafiltration unit, and the effluent enters the first-stage reverse osmosis. The volume ratio of fresh water and concentrated water produced by the first-stage reverse osmosis is controlled at 3:1, and the conductivity of the fresh water is 30 μS / cm. It enters the second-stage reverse osmosis, and the concentrated water enters the inverted electrodialysis unit. The volume ratio of fresh water and concentrated water in the secondary reverse osmosis is controlled at 10:1, the concentrated water is returned to the primary reverse osmos...

Embodiment 3

[0044] The method is used to treat radioactive wastewater with a radioactivity level of 5000Bq / L and a conductivity of 1500μS / cm. When the system is turned on, the membrane module is automatically flushed and enters the normal working procedure. When the system is out of service, use non-radioactive water or fresh water generated by the system for online flushing. The radioactive wastewater first passes through the security filter and the ultrafiltration unit, and the effluent enters the first-stage reverse osmosis. The volume ratio of fresh water and concentrated water produced by the first-stage reverse osmosis is controlled at 10:1, the conductivity of the fresh water is 100μS / cm, and it enters the second-stage reverse osmosis, and the concentrated water enters the inverted electrodialysis unit. The volume ratio of fresh water and concentrated water in the secondary reverse osmosis is controlled at 5:1, the concentrated water is returned to the primary reverse osmosis unit...

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Abstract

The invention discloses a method for treating radioactive wastewater. The method for treating the radioactive wastewater comprises the steps of firstly carrying out reverse osmosis treatment on the radioactive wastewater, then enabling the radioactive wastewater to enter a continuous electrodeionization unit to be treated, and further removing radionuclide so as to enable treated wastewater to reach discharge requirements; and respectively filling different mixed ion exchange resin in a plain water chamber and a thick water chamber in a continuous electrodeionization membrane stack of the continuous electrodeionization unit, wherein mixed ion exchange resin filled in the plain water chamber comprises, by volume ratio, 30%-60% of strong-acid cation exchange resin, 40%-60% of strong-base anion exchange resin, and 0%-30% of weak-base anion exchange resin, mixed ion exchange resin filled in the thick water chamber comprises, by volume ratio, 20%-50% of strong-acid cation exchange resin, and the balance strong-base anion exchange resin. A weak dissociation polymer portion is used for improving selectivity of continuous electrodeionization membrane stack to trace amount radionuclide, radionuclide with extremely concentration can be effectively removed, and the method for treating the radioactive wastewater ensures that the final discharged water satisfies the discharge requirements.

Description

technical field [0001] The invention relates to a method for treating radioactive waste water by adopting reverse osmosis and continuous electric desalination. Background technique [0002] In the past, when treating radioactively contaminated wastewater in the nuclear industry, traditional processes were usually used: evaporation + ion exchange. In this traditional process, after the radioactive wastewater is treated by two-stage evaporation, the condensate enters the ion exchange resin bed for fine treatment to meet the environmental discharge requirements; , for long-term geological storage; radioactive waste ion exchange resin enriched with a large number of nuclides, after immobilization treatment, for long-term geological storage. The advantages of traditional technology are: mature technology and strong decontamination ability. The disadvantages are: high energy consumption; large amount of radioactive waste resin; huge equipment, high investment, poor operating con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/12
CPCB01D61/025B01D61/48B01D61/58C02F1/441C02F1/4695C02F2001/427C02F2101/006G21F9/06G21F9/12Y02A20/124Y02A20/131C02F2201/46115
Inventor 赵璇李福志张猛
Owner BEIJING QINGHE CHAOHUA TECH CO LTD
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