Abstract
Microwave technology was applied in two combined freezing-based processes to desalinate raw seawater. The two processes employed freezing, microwaving and centrifugal desalination (FMCD) process and freezing, microwaving, gravity-induced and centrifugal desalination (FMGCD) process respectively. The removal efficiencies of salt, TDS (total dissolved solids), Cl−, Ca2+ and Mg2+, the ice yield rate as well as the duration time of the two desalination processes were studied. The results were compared with that of our previous study using combined freezing, gravity-induced and centrifugal desalination (FGCD) process. The study showed that microwave treatment can greatly accelerate the desalination in the two combined processes. By applying a two-minute microwave treatment, the desalination effect of FMGCD process is similar to or better than that of FGCD process. Taking TDS and Cl− concentration as reference indicators, the ice product quality of FMGCD process can meet the drinking water standard requirement when the brine reject proportion is >54%.
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