期刊
JOURNAL OF MEMBRANE SCIENCE
卷 579, 期 -, 页码 294-301出版社
ELSEVIER
DOI: 10.1016/j.memsci.2019.02.044
关键词
Ceramic membrane; Nanofiltration; Membrane distillation; Boric acid
资金
- National Key Research and Development Program of China [2016YFC0205700, 2017YFC0403702]
- National Natural Science Foundation of China [91534108, 21706115, 21506093]
- National High Technical Research Program of China [2012AA03A606]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT13070]
To reduce the emission of radioactive waste water and reuse high-value B-10-rich nuclear-grade boric acid from a nuclear power plant, a two-step membrane process was proposed based on the combination of two types of ceramic membranes. First, a ceramic nanofiltration membrane was used to purify the boric acid by removing the nuclide. Then, the purified boric acid solution was concentrated by a vacuum membrane distillation process based on a hydrophobic ceramic membrane. The operating parameters of both membrane processes were systematically discussed and optimized. In the nanofiltration process, the retention rates of Co2+ and Ag+ ions were approximately 99.2% and 75.8%, respectively, and the permeation flux was stable at approximately 178 Lm(-2) h(-1) . When a two-stage NF process was implemented, the removal of Co2+ ions was higher than 99.9%, and the removal of Ag+ ions was greater than 95%. In the membrane distillation process, the boric acid was concentrated from 1 to 107 g L-1 . Meanwhile, the permeation flux was maintained above 20 L m(-2) h(-1), and the retention rate of boric acid was maintained at a high level ( > 99.9%) throughout the entire enrichment process. The hybrid membrane processes are suitable candidates for the purification and recycling of boric acid from radioactive waste water.
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