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Multi-step combined method for purifying radioactive cesium-polluted drinking water and device used by multi-step combined method

A radioactive and polluted water technology, applied in the field of water treatment, can solve the problems of difficult settlement of copper ferrocyanide adsorbent, increase the burden of treatment membrane separation unit, difficult to popularize and apply, etc., achieve significant environmental and social benefits, reduce production, The effect of reducing potential harm

Inactive Publication Date: 2017-05-31
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the copper ferrocyanide adsorbent is difficult to settle, which increases the burden on the subsequent treatment of the membrane separation unit, will cause serious membrane pollution, shorten the life of the membrane, and is difficult to popularize and apply
In order to improve the precipitation performance of the copper ferrocyanide adsorbent, based on the combined adsorption-membrane separation technology, a coagulation treatment unit was added, and the membrane fouling was slowed down to a certain extent, but it was still serious

Method used

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  • Multi-step combined method for purifying radioactive cesium-polluted drinking water and device used by multi-step combined method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: The initial activity concentration of simulated radioactive cesium chloride raw water is 920Bq / L, and the stable cesium ion concentration is 0.25mg / L. When the dosage of copper ferrocyanide adsorbent is 20mg / L, the dosage of aluminum sulfate (as Al 3+ When the concentration is 3mg / L, the adsorption / coagulation is 10min, the precipitation is 10min, and the residence time of the membrane separation tank is 30min. The stable cesium ion removal rate of the test effluent was 99.90%, and the simulated activity concentration was 0.90Bq / L.

Embodiment 2

[0025] Embodiment 2: The initial activity concentration of simulated radioactive cesium chloride raw water is 920Bq / L, and the stable cesium ion concentration is 0.25mg / L. When the dosage of copper ferrocyanide adsorbent is 20mg / L, the dosage of aluminum sulfate (as Al 3+ When the concentration is 5mg / L, the adsorption / coagulation is 20min, the precipitation is 10min, and the residence time of the membrane separation tank is 30min. The stable cesium ion removal rate of the test effluent was 99.91%, and the simulated activity concentration was 0.85Bq / L, meeting the requirements of the "Drinking Water Hygienic Standard" (GB 5749-2006).

Embodiment 3

[0026] Example 3: The initial activity concentration of simulated radioactive cesium chloride raw water is 920Bq / L, and the stable cesium ion concentration is 0.25mg / L. When the dosage of copper ferrocyanide adsorbent is 20mg / L, the dosage of aluminum sulfate (as Al 3+ When the concentration is 5mg / L, the adsorption / coagulation is 10min, the precipitation is 15min, and the residence time of the membrane separation tank is 30min. The stable cesium ion removal rate of the test effluent was 99.90%, and the simulated activity concentration was 0.89Bq / L.

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Abstract

The invention relates to a multi-step combined method for purifying radioactive cesium-polluted drinking water and a device used by the method. The method comprises carrying out adsorption / coagulation, sedimentation and membrane separation, adding a cupric ferrocyanide adsorbent and an aluminum salt coagulant into an adsorption tank, fully mixing the adsorbent, coagulant and radioactive cesium-polluted water for a reaction for 10-20min, carrying out precipitation for 10-15min, feeding the supernatant into a film separation tank, filtering the supernatant in the film separation tank through a hollow fiber film and discharging the product water. The method simplifies processes. The device utilizes an independent precipitation unit so that precipitation performances of a cupric ferrocyanide adsorbent are improved and film pollution is reduced. The method and device are suitable for emergency treatment on radioactive cesium-polluted drinking water and waste water, and have a wide application prospect and prominent environmental and social benefits.

Description

technical field [0001] The invention relates to a water treatment technology, specifically to remove radioactive cesium ions from drinking water. A method and device for multi-step joint purification of radioactive cesium-contaminated drinking water are provided. Background technique [0002] With the application of radioisotopes in military, energy, medical, agricultural and other fields, the probability of radioactive contamination of drinking water sources is increasing. Cs( 137 Cs and 134 Cs) by 235 U and 239 Produced by Pu nuclear fission, widely present in radioactively polluted water. The Fukushima nuclear power plant accident in Japan in 2011 was a typical case of radioactive cesium exposure to drinking water sources, causing serious radioactive potential hazards to nearby residents and the public. Therefore, in response to sudden radioactive cesium pollution, it is necessary to develop emergency treatment methods for efficiently removing radioactive cesium ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04G21F9/00G21F9/06G21F9/12C02F1/00C02F1/44C02F1/52
CPCC02F1/44C02F1/52C02F1/5245C02F9/00C02F2001/007C02F2101/006G21F9/001G21F9/008G21F9/06G21F9/12
Inventor 张光辉武静明顾平胥要王旭骞侯立安
Owner TIANJIN UNIV
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