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Method for repairing nuclide cesium pollution of seawater

A seawater and nuclide technology, applied in the field of remediation of nuclide pollution, can solve rare problems, and achieve the effects of low cost, simple and easy remediation and recovery and high efficiency.

Inactive Publication Date: 2019-01-29
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no mature biotechnology applied to remediate radionuclide-contaminated environments, especially the research on the application of living seaweed to remediate radionuclide pollution is still very rare

Method used

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  • Method for repairing nuclide cesium pollution of seawater
  • Method for repairing nuclide cesium pollution of seawater
  • Method for repairing nuclide cesium pollution of seawater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Comparison and Screening of Cesium Adsorption Capability of Different Seaweeds

[0023] Five species of seaweed larvae that are common in coastal areas of my country and have large biomass were selected: sea millet (Sargassum muticum), sage (Sargassum thunbergii), true gracilaria (Gracilaria vermiculophylla), kelp (Saccharina japonica) and wakame (Undaria pinnitafida) ). Take an appropriate amount of live seaweed into a 1L beaker, and add different concentrations of cesium (20, 100 and 500mg L -1 ), the natural seawater without cesium was used as the control group, and each group of experiments was set up with 3 parallels; the temperature was 15 °C, and the light intensity was 50 μmol photons m -2 s -1 , Light cycle 12h (L): 12h (D) in the incubator for aeration culture, cultured for 3 days, take out an appropriate amount of algal samples, and detect the content of cesium in the algae under different cesium concentrations by ICP-OES (Table 1).

[0024] Table 1 Compari...

Embodiment 2

[0028] Comparison of cesium adsorption capacity between kelp and wakame seedlings

[0029] Take kelp larvae or wakame larvae with a length of about 15cm and place them in a 1L beaker, and place them at a temperature of 15°C and a light intensity of 50μmol photons m -2 s -1 , light cycle 12h (L): aerated culture in an incubator for 12h (D); the incubator contains cesium (20, 100 and 500 mg L of different concentrations) -1 ) beakers of natural seawater were used as the experimental group, or the beakers only filled with natural seawater as the control group. Each group of experiments was set up in 3 parallels, and the water was changed every day. After culturing for 1, 3, and 5 days, take out an appropriate amount of kelp and wakame samples. ICP-OES detects the content of cesium in the algae under different conditions (see Table 2); wherein, the concentration of cesium in the natural seawater is 24 ± 5 ​​μg L -1 , which is negligible compared to the added cesium concentration...

Embodiment 3

[0034] Example 3 Water tank simulation experiment for removing cesium ions from adult kelp

[0035] Into a 148L glass tank, live adult kelp (52.7g / L) with a fresh weight of about 7.8kg (about 2.6kg / tree) was added for aeration culture, and cesium chloride was added to the seawater in advance, so that the initial concentration of cesium was 143mg L -1 (measured value), take seawater samples at 1, 2, 3, 6, 8, 12, 24, and 48 hours of treatment, respectively, to detect the cesium content (see figure 1 ).

[0036] Depend on figure 1 The results show that under artificial simulation conditions, the restoration process of kelp to seawater nuclide cesium is basically completed within 24 hours, and then the algae can be recovered and treated, and fresh kelp is added again until the cesium in seawater is completely removed.

[0037] It can be seen from the above Example 3 that the water tank model can simulate the process of using live seaweed to reduce the concentration of nuclides i...

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Abstract

The invention relates to nuclein pollution repairing technologies and particularly relates to a method for repairing nuclide cesium pollution of seawater. The method comprises the steps of adding living Saccharina japonica or Undaria pinnitafida into the seawater to be repaired, and then, adsorbing nuclide cesium from seawater sewage to be repaired. The method disclosed by the invention has the advantages of good adsorption effect, low cost and simplicity and convenience in operation, and thus, an important basis is settled for in-situ biological repair of offshore radionuclide polluted sea areas.

Description

technical field [0001] The invention relates to a technology for repairing nuclide pollution, in particular to a method for repairing seawater nuclide cesium pollution. Background technique [0002] In recent years, with the continuous development of nuclear technology, the number of coastal nuclear power plants has increased significantly, and radionuclide pollution has become an increasingly serious problem that needs to be solved urgently. Several of the more common nuclide pollutants, even at lower concentrations, can cause serious pollution problems in coastal waters. [0003] Conventional methods for treating radionuclide contamination include physical methods and chemical methods, such as zeolite adsorption, ion exchange, solvent extraction, etc. However, these methods have high cost, easily cause secondary pollution, and are difficult to be used to treat large-scale pollution in the environment. With the development of modern biotechnology, more and more attention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/18C02F3/32C02F101/20
CPCG21F9/18C02F3/322C02F2101/20
Inventor 王雪妹单体锋逄少军
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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