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Method for treating radiostrontium polluted water through double carrying coprecipitation-membrane separation

A technology of radioactive strontium and membrane separation, which is applied in the treatment of radioactive strontium contaminated water, and in the field of secondary carrier co-precipitation-membrane separation to treat radioactive strontium contaminated water, which can solve the problem of low usage rate of precipitant, high pH value and limited effect of strontium and other problems, to achieve the effect of lowering the pH value, improving the decontamination factor, and increasing the utilization rate

Inactive Publication Date: 2018-02-02
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is only one-time carrier co-precipitation, and the usage rate of precipitant is low. Most of the Na 2 CO 3 as free CO 3 2- The form flows out with the effluent, causing the problem of high pH value (pH>10.7) of the treated effluent
In addition, the method has limited strontium removal effect, and the decontamination factor is 1000, and there is room for further improvement

Method used

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  • Method for treating radiostrontium polluted water through double carrying coprecipitation-membrane separation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 0.15g / L SrCO with an average particle size of 100μm to the first and second loading units in advance 3 Seed. Prepare the mass concentration with strontium chloride to be 8×10 -4 mg / L raw water containing non-radioactive strontium to simulate radioactive strontium contaminated water, enter the first carrier unit, add 4mg / L strontium chloride, and add 0.5g / L Na 2 CO 3 The precipitating agent was mechanically stirred at 150rpm for 15 minutes, and then settled for 15 minutes. The supernatant of the first carrier enters the second carrier pretreatment unit, and adds dilute hydrochloric acid to adjust the pH value to 8.3, then adds 36mg / L strontium chloride, mixes well and then enters the second carrier unit. Add 0.5g / L Na to the second carrier unit 2 CO 3 The precipitating agent was mechanically stirred at 150rpm for 15 minutes and statically settled for 8 minutes. The supernatant liquid entered the membrane separation unit and was filtered by the membrane module be...

Embodiment 2

[0025] Add 0.150g / L SrCO with an average particle size of 100μm to the first and second loading units in advance 3 Seed. Prepare the mass concentration with strontium chloride to be 8×10 -4 mg / L strontium-containing raw water to simulate radioactive strontium-contaminated water, enter the first carrier unit, add 12mg / L strontium chloride, and add 0.3g / L Na 2 CO 3The precipitating agent was mechanically stirred at 150rpm for 15 minutes, and then settled for 15 minutes. The supernatant of the first carrier enters the second carrier pretreatment unit, and adds dilute hydrochloric acid to adjust the pH value to 8.3, then adds 28 mg / L strontium chloride, mixes well and enters the second carrier unit. Add 0.7g / L Na to the second carrier unit 2 CO 3 The precipitating agent was mechanically stirred at 150rpm for 15 minutes and statically settled for 8 minutes. The supernatant liquid entered the membrane separation unit and was filtered by the membrane module before effluent. It ...

Embodiment 3

[0027] Add 0.085g / L SrCO with an average particle size of 50μm to the first and second loading units in advance 3 Seed. Prepare the mass concentration with strontium chloride to be 8×10 -4 mg / L strontium-containing raw water to simulate radioactive strontium-contaminated water, enter the first carrier unit, add 20mg / L strontium chloride, and add 0.9g / L Na 2 CO 3 The precipitating agent was mechanically stirred at 150rpm for 15 minutes, and then settled for 15 minutes. The supernatant of the first carrier enters the second carrier pretreatment unit, and adds dilute hydrochloric acid to adjust the pH value to 8.3, then adds 20mg / L strontium chloride, mixes well and then enters the second carrier unit. Add 0.1g / LNa to the second carrier unit 2 CO 3 The precipitating agent was mechanically stirred at 150rpm for 15 minutes and statically settled for 8 minutes. The supernatant liquid entered the membrane separation unit and was filtered by the membrane module before effluent. ...

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Abstract

The invention relates to a method for treating radiostrontium polluted water through double carrying coprecipitation-membrane separation. The method comprises the following steps: performing primary carrying: adding radiostrontium polluted water and nonradioactive strontium into a primary carrying unit containing previously added SrCO3 crystal seeds, performing thorough mixing, throwing Na2CO3 precipitant, performing stirring, performing static settlement, and enabling the supernate to enter a secondary carrying pretreatment unit; performing secondary carrying: adding secondary carrying inletwater and Na2CO3 precipitant into the secondary carrying unit containing previously added SrCO3 crystal seeds, performing stirring, performing static settlement, and enabling the supernate to enter amembrane separation unit; and enabling the supernate after the secondary carrying to enter the membrane separation unit, and performing filtration through a membrane component therein to output outletwater. The method provided by the invention is used for treating the radiostrontium polluted water, controls the total amount of the Na2CO3 precipitant and the nonradioactive strontium to be unchanged, can improve the use rate of the Na2CO3, can reduce the pH value of the outlet water and can effectively remove the radiostrontium in the water, thereby improving the strontium decontamination factor.

Description

technical field [0001] The invention belongs to the technical field of water treatment technology, and relates to a method for treating radioactive strontium-contaminated water; in particular, it relates to a method for treating radioactive strontium-contaminated water by secondary carrier co-precipitation-membrane separation. Background technique [0002] With the development of industrialization and the improvement of human living standards, energy consumption continues to increase. Compared with fossil fuels, nuclear energy is a clean energy with huge energy, high efficiency and sustainable development, which has attracted more and more attention from all countries. According to reports, in 2011 nuclear power generation accounted for 16% of the world's total electricity generation. However, a large amount of radioactive nuclear polluted water produced during the operation and maintenance of nuclear power plants and various nuclear accidents seriously threatens human heal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/10G21F9/12
Inventor 张光辉张铭栋顾平侯立安
Owner TIANJIN UNIV
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