Strontium recovery from synthetic wastewater by magnetic co-precipitation and fluidized-bed homogeneous crystallization technology
碩士 === 國立成功大學 === 化學工程學系 === 103 === Increased operation of nuclear power plants and nuclear laboratoriesare the source of radioactive wastes released into the environment. The radioactive contaminations like Strontium is the important nuclear fission products that are routinely or accidentally rele...
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| Format: | Others |
| Language: | zh-TW |
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2015
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| Online Access: | http://ndltd.ncl.edu.tw/handle/25256413769455386423 |
| Summary: | 碩士 === 國立成功大學 === 化學工程學系 === 103 === Increased operation of nuclear power plants and nuclear laboratoriesare the source of radioactive wastes released into the environment. The radioactive contaminations like Strontium is the important nuclear fission products that are routinely or accidentally released. This research recoverd the strontium ions from synthetic wastewater and optimized the operation.
Sr removal of 99.9 % was achieved with coprecipitation system at Fe(II)/Sr of 1.2, pH of 10, air flow rate of 4 L/min and temperature of 60 ℃. The product is the mixture of strontianite (SrCO3) and magnetite (Fe3O4) phase. In FBHC system, the results could be achieved the Sr removal efficiency of 96 % and the crystallization ratio of 83 % at the effulent pH of 9.45. Actual surface loading of FBHC system is around 1.91 kg-Sr/m2．hr. XRD analysis revealed that the crystal product is strontianite (SrCO3) phase. The surface morphology of SEM analysis revealed that strontium carbonate particles were formed by the aggregation of fine crystal. These two technologies can effectively remove Sr in aqueous solution and recover them as magnetic precipitates or crystal pellets.
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