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Treatment method of process wastewater in nuclear power plant

A treatment method and technology for nuclear power plants, applied in nuclear engineering, radioactive purification, etc., can solve the problems of being unsuitable for the treatment of volatile nuclides, the amount of wastewater treatment is small, and the amount of secondary waste is large, and the amount of wastewater treatment is not limited. Limiting, reducing the amount of secondary waste, the effect of small footprint

Inactive Publication Date: 2015-08-26
HUNAN TAOHUAJIANG NUCLEAR POWER +1
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Problems solved by technology

[0012] In order to solve the problems of large amount of secondary waste, high energy consumption, more process equipment, complex interface, small amount of wastewater treatment, and unsuitable treatment of wastewater containing volatile nuclides and foaming, existing in the process wastewater treatment of nuclear power plants , the invention provides a treatment method for nuclear power plant process wastewater

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Embodiment

[0028] A treatment method for nuclear power plant process wastewater, comprising the steps of:

[0029] (1) Add chemical flocculants to the nuclear power plant process wastewater with a flow rate of 360L / h to flocculate colloidal radionuclides. After testing, the radionuclide source items of the nuclear power plant process wastewater include 10 4 Bq / L 137 Cs, 10 4 Bq / L 90 Sr, 10 3 Bq / L 60 Co. 10 2 Bq / L 110 Ag and 10 2 Bq / L 54 Fe.

[0030] (2) Pass the nuclear power plant process wastewater after step (1) through the activated carbon layer, filter out the colloidal radionuclide floes generated in step (1), and remove most of the non-colloidal radionuclide by adsorption; then, Adsorption through the zeolite layer further removes remaining radionuclides. After the step (2) is processed, the radionuclide and the specific activity in the process wastewater are as follows: 12Bq / L 137 Cs, 6Bq / L 90 Sr, 1Bq / L 60 Co. 110 Ag not detected, 10 2 Bq / L 54 Fe and the decontam...

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Abstract

The invention relates to a treatment method of radioactive wastewater, and solves the problem that in a conventional treatment method of process wastewater in a nuclear power plant is large in secondary waste quantity, high in energy consumption and the like. The invention provides a treatment method of process wastewater in a nuclear power plant. The treatment method comprises the following steps: (1) chemical flocculants are added in process wastewater, and colloidal radionuclides are flocculated; (2) the process wastewater after being treated in the step (1) passes through an active carbon layer, colloidal radionuclide floccules are filtered out, and most of non-colloidal radionuclides are removed through adsorption; then the process wastewater passes through a zeolite layer to be adsorbed to further remove rest of radionuclides; (3) the process wastewater after being treated in the step (2) is subjected to ion exchange to remove salt and achieve pH regulation. The treatment method minimizes the use amount of ion exchange resin, reduces the secondary waste quantity remarkably, eliminates an evaporation process, reduces the energy consumption greatly, and has better economy.

Description

technical field [0001] The invention relates to a treatment method for radioactive waste water, in particular to a treatment method for nuclear power plant process waste water. Background technique [0002] Nuclear power plant process wastewater mainly includes three parts, which are boron-containing reactor coolant system effluent, ground drainage, and process wastewater containing high suspended particles. The radioactivity level is usually 10 4 ~10 6 Bq / L, usually contains a wide variety of radionuclides. According to the newly revised national standard (GB6249-2011), the radionuclide limit for coastal nuclear power plant sites is 1000Bq / L (excluding tritium and carbon-14), while the discharge limit for inland sites is 100Bq / L. Therefore, it is necessary to properly treat the process wastewater of nuclear power plants to remove the radionuclides in order to meet the discharge requirements. [0003] In addition to the above mandatory requirements, in the field of radioa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/10G21F9/12
CPCG21F9/10G21F9/12
Inventor 郑砚国张振涛刘明章游新锋王松平郑文俊李俊雄王雷邱乙亩华小辉陶幼林杨林月张旭郑宇杨勇刚
Owner HUNAN TAOHUAJIANG NUCLEAR POWER