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Method and device for processing radioactive strontium-contained waste water

A radioactive wastewater and radioactive technology, applied in radioactive purification, nuclear engineering and other directions, can solve the problems of high power consumption, increased requirements for radiation protection of mechanical equipment, high cost, and achieve increased concentration multiples, significant environmental benefits, and broad application prospects. Effect

Inactive Publication Date: 2014-04-09
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Compared with the conventional chemical precipitation method, although the mechanical agitation co-precipitation method increases the concentration factor and decontamination factor, the increase is not significant, and the increased mechanical equipment has higher requirements for radiation protection, making operation, maintenance and operation management difficult.
The operating cost of strontium removal by reverse osmosis technology is high; ion exchange and continuous electric desalination have strict restrictions on the salt content of wastewater, and the former will produce a large amount of radioactive waste resin, resulting in difficulties and high costs for subsequent solid waste treatment, while the latter higher power consumption

Method used

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  • Method and device for processing radioactive strontium-contained waste water

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Experimental program
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Effect test

Embodiment 1

[0025] Embodiment 1: The flow rate of the device is 16.6 L / h, and the total residence time is 90 minutes, wherein the residence time of the hydrocyclone reactor is 45 minutes, and the hydraulic residence time of the membrane separator is 45 minutes. The simulated radioactive strontium-containing wastewater with a strontium concentration of 5 mg / L at the device is used. At the start of the experiment, 300mg / L of calcium carbonate seeds prepared in advance were added to the hydrocyclone reactor; in the experiment, the dosage of sodium carbonate was 1000mg / L, and the dosage of ferric chloride was 3.0mg / L (based on Fe 3+ meter), the mass concentration of strontium in the effluent was stable at 5 μg / L. The process has a concentration factor of 3150 and a decontamination factor of 1000.

Embodiment 2

[0026] Example 2: The flow rate of the device is 12.5 L / h, and the total residence time is 120 minutes, wherein the residence time of the hydrocyclone reactor is 60 minutes, and the hydraulic residence time of the membrane separator is 60 minutes. The device is used to treat simulated radioactive strontium-containing wastewater with a strontium concentration of 10mg / L. At the start of the experiment, 800mg / L of calcium carbonate seeds prepared in advance were added to the hydrocyclone reactor; 3+ meter), the mass concentration of strontium in the effluent was stable at 7 μg / L. The process has a concentration factor of 3400 and a decontamination factor of 1400.

Embodiment 3

[0027] Embodiment 3: The flow rate of the device is 15 L / h, and the total residence time is 100 minutes, wherein the residence time of the hydrocyclone reactor is 50 minutes, and the hydraulic residence time of the membrane separator is 50 minutes. The device is used to treat simulated radioactive strontium-containing wastewater with a strontium concentration of 8mg / L. At the start of the experiment, 500 mg / L of calcium carbonate seeds prepared in advance were added to the hydrocyclone reactor; in the experiment, the dosage of sodium carbonate was 1000 mg / L, and the dosage of ferric chloride was 3.0 mg / L (based on Fe 3+ meter), the mass concentration of strontium in the effluent was stable at 6 μg / L. The process has a concentration factor of 3200 and a decontamination factor of 1300.

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Abstract

The invention relates to a method and device for processing radioactive strontium-contained waste water. Chemical reactions are achieved between the radioactive strontium-contained waste water in a hydrocyclone and calcium carbonate seed crystals through hydrocycolone stirring and between the radioactive strontium-contained waste water in the hydrocyclone and sodium carbonate through hydrocycolone stirring, and therefore strontium carbonate is deposited on the surfaces of the calcium carbonate seed crystals and forms large-grain-size tight crystal particulate matter, and the large-grain-size tight crystal particulate matter rapidly sedimentates at the bottom of the hydrocyclone so that a part of radioactive strontium ions can be removed; small-grain-size strontium carbonate and small-grain-size seed crystals enter a membrane separator along with the supernatant to react with ferric chloride, the radioactive strontium ions are further removed after the particulate matter is separated through a hollow fibrous membrane, and therefore the radioactivity of discharged water is greatly lowered. The particulate matter formed through the method is large in grain size, compact in structure and good in sedimentation performance, the defects that the chemical precipitation method is low in decontamination factor and large in mud production amount are effectively overcome, the disadvantage that the membrane is seriously contaminated in the membrane separation process is also eliminated, and the method for processing the radioactive strontium-contained waste water is economical and practical.

Description

technical field [0001] The invention relates to a technology for treating radioactive waste water, specifically removing radioactive strontium ions from waste water. Background technique [0002] Radioactive strontium ( 90 Sr and 89 Sr) is made by 235 U and 239 Produced by Pu nuclear fission, it is widely present in radioactive wastewater. In March 2011, the Fukushima Nuclear Power Plant in Japan caused a radioactive leak due to an earthquake, and the discharged wastewater contained a large amount of radioactive strontium. 90 The half-life of Sr is as long as 28.9 years. It has strong biological toxicity and is difficult to discharge when it accumulates in human bones. Therefore, it needs to be removed from radioactive wastewater to protect the environment and human health. [0003] The process of chemical precipitation method is simple, easy to operate, and low in operating costs. It is suitable for the treatment of radioactive wastewater with a constant or trace amoun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/06
Inventor 顾平张光辉武莉娅王全震侯立安
Owner TIANJIN UNIV
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