Study on Treatment of Radioactive Wastewater by Pellet Method

Abstract:

A pellet method was used to treat the radioactive wastewater in the paper. Calcium carbonate powders were used to prepare seeds, sodium carbonate was used as the chemical precipitant and the natural isotope of strontium (88Sr) was used instead of 90Sr. The strontium element was removed by forming compacted crystal particles on the seeds. The impact of temperature on seed preparation and the effect of the process were studied. After 30 cycles of operation, the calcium carbonate powders grew to larger particles and the effluent turbidity and hardness maintained stable. Therefore it was enough for 30 cycles to complete the preparation of the seeds. When the seeds were used to treat the strontium wastewater, the effluent turbidity was initially high and then declined quickly. The average effluent turbidity was 0.51NTU. The mean hardness removal efficiency was 55.24%. The strontium removal rate fluctuated and the average removal efficiency was 97.36%. Ferric chloride coagulation and micro-filtration would enhance the effect of strontium removal. The average removal efficiency could be up to 99%. The formation of pellets enhanced the sedimentation performance of the precipitates formed. The mixture was kept quiescent for 24h after the test was over. The chemical sludge concentration factor was more than 5000.

• Periodical: Advanced Materials Research (Volumes 518-523)
• Pages: 2875-2880
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.518-523.2875
• Online since: May 2012
• Authors: Xin Luo, Ping Gu, Xue Wang
• Keywords: Chemical Precipitation, Pellet, Radioactive Wastewater, Strontium

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