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Flocculation adsorption treatment method of waste liquid of nuclear power plant and flocculating agent

A technology for adsorption treatment and nuclear power plants, which is applied in the field of flocculation and adsorption treatment of nuclear power plant waste liquid and flocculants, can solve the problems of rare radioactive waste liquid treatment, achieve stable removal effect, cost-effective, and produce secondary waste little effect

Active Publication Date: 2015-06-03
SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these treatment technologies are still in the research stage and are rarely used in the treatment of radioactive waste in nuclear power plants.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Add flocculant to nuclear power plant waste liquid, add 12.4 mg of flocculant per liter of nuclear power plant waste liquid, keep the pH value at 9, mix and react for 15 seconds to obtain colloidal flocs;

[0032] The nuclear power plant waste liquid includes 4.5mg / L Fe, 7.2mg / L Co, 1.8mg / L Mn;

[0033] The flocculant includes the following components; A component: NaOH; B component: polyacrylamide; C component: sodium polyacrylate; wherein, the mass ratio of A component, B component and C component is 1.1: 1:1;

[0034] (2) Pass the colloidal flocs obtained in step (1) through the activated carbon adsorption column at a flow rate of 20m / h, where the flocs are adsorbed and retained by the activated carbon adsorption column, and the decontamination factors of Fe, Co, and Mn nuclide colloids in the obtained waste liquid Respectively: 150, 82, 67, the average decontamination factor is 93;

[0035] The filling height of the activated carbon adsorption column is 0.2m; ...

Embodiment 2

[0037] (1) Add flocculant to nuclear power plant waste liquid, add 10 mg of flocculant per liter of nuclear power plant waste liquid, keep the pH value at 7, mix and react for 15 seconds to obtain colloidal flocs;

[0038] The nuclear power plant waste liquid includes 3.1mg / L Fe, 4.4mg / L Co, 1.1mg / L Mn;

[0039] The flocculant includes the following components; A component: NaOH; B component: polyacrylamide; C component: sodium polyacrylate; wherein, the mass ratio of A component, B component and C component is 8: 1:1;

[0040] (2) Pass the colloidal flocs obtained in step (1) through the activated carbon adsorption column at a flow rate of 10m / h, wherein the flocs are adsorbed and retained by the activated carbon adsorption column, and the decontamination factors of Fe, Co, and Mn nuclide colloids in the obtained waste liquid They are: 104, 102, 16, and the comprehensive decontamination factor is 61;

[0041] The filling height of the activated carbon adsorption column is 0...

Embodiment 3

[0043] (1) Add flocculant to nuclear power plant waste liquid, add 8.4 mg of flocculant per liter of nuclear power plant waste liquid, keep the pH value at 9, mix and react for 15 seconds to obtain colloidal flocs;

[0044] The nuclear power plant waste liquid includes 1.5mg / LAg;

[0045] The flocculant includes the following components; A component: NaOH; B component: polyacrylamide; C component: sodium polyacrylate; wherein, the mass ratio of A component, B component and C component is 2.2: 1:1;

[0046] (2) Pass the colloidal flocs obtained in step (1) through the activated carbon adsorption column at a flow rate of 20m / h, wherein the flocs are adsorbed and retained by the activated carbon adsorption column, and the decontamination factor of Ag nuclide colloids in the obtained waste liquid is 91;

[0047] The filling height of the activated carbon adsorption column is 0.2m; the particle size of the activated carbon is 20-50 mesh, and the iodine number is ≥900mg / g.

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PUM

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Abstract

The invention provides a flocculation adsorption treatment method of waste liquid of a nuclear power plant and a flocculating agent. The flocculation adsorption treatment method includes the steps of adding flocculating agent into the waste liquid of the nuclear power plant, keeping a pH (potential of hydrogen) value within 7-9, performing mixed reaction to obtain colloid flocculation; and subjecting the colloid flocculation to activated carbon adsorption column for adsorption, wherein Fe, Co, Mn and Ag nuclides are absorbed and intercepted by the activated carbon adsorption column. The flocculating agent comprises a component A including NaOH or KOH, a component B which is polyacrylamide, a component C which is sodium polyacrylate or potassium polyacrylate. Coagulation capacity of corrosion product colloids is improved by adding the flocculating agent, and decontamination factor of activated carbon to Fe, Co, Mn, Ag is increased by 5 times. The flocculation adsorption treatment method is stable in eliminating effect, good in repeatability, low in running energy consumption and less in secondary pollution output.

Description

technical field [0001] The invention relates to nuclear power plant waste liquid treatment technology, in particular to a flocculation adsorption treatment method and a flocculant for nuclear power plant waste liquid. Background technique [0002] The operation of nuclear power plants inevitably produces radioactive waste liquid. With the development of nuclear power in my country, more and more attention has been paid to the impact of nuclear power plant construction on the water environment. In order to provide safer, reasonable, effective and accurate evaluation specifications for the environmental radiation protection and impact of nuclear power construction in my country in the new era, the Ministry of Environmental Protection took the lead in formally approving the "GB 6249-2011 Environmental Radiation of Nuclear Power Plants" in 2011. A batch of newly upgraded nuclear power waste discharge management standards represented by the Protection Regulations. The standard s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21F9/12
Inventor 刘杰安陈斌王鑫柳丹朱来叶翁明辉谈遗海储志军刘兵
Owner SHANGHAI NUCLEAR ENG RES & DESIGN INST CO LTD
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