Application 1035

Column vs RBR

A performance comparison between a column (fixed bed reactor) and rotating bed reactor (RBR) for de-ionizing 1000 L of tap water. Using best-in-class standard protocols for both technologies, we tested which technology could de-ionize to a desired endpoint conductivity value the quickest. The result show that the RBR is significantly faster, reaching 3.7 times faster a conductivity level of 0.15 µS/cm compared to the column.

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    4L of Lewatit NM 60 mixed bed resin were packed in a Siliex 1C column and RBR S5, respectively. The output of the column was used as the desired endpoint conductivity value, as it is the less flexible output compared to the RBR. 1000 L of tap water (conducitivity starting point was ca 112 µS/cm, temperature 6-10C) was pumped through the column at a flow rate of 1.8 L/min and after 556 minutes all 1000 L had passed the column. The treated water had an average conductivity value of about 0.15 µS/cm. The same water conditions was used for the RBR where it spun at 300 RPM and reached the same conductivity (0.15 µS/cm) after only 150 minutes.