A Novel Unit Operation to Remove Hydrophobic Contaminants, 19PEERS
For mills making paper with recovered fiber, removal of hydrophobic contaminants is essential for trouble-free operation of papermachines. Significant cost savings on paper machine operation can be achieved by reducing deposits, which results in better quality, reduced downtime, increased fiber yield, and reduced energy consumption.
Bubble nucleation neparation (BNS) is a relatively new process for removing hydrophobic particles. When vacuum is applied to a slurry, dissolved gas bubbles nucleate on hydrophobic particles and drag them to the surface for easy removal. We constructed a 16 liter batch unit to evaluate the effect of operating parameters on removal of hydrophobic particles, using statistical design of experiments. These results were used to guide our design of a 16 liter continuous unit. We tested this unit on laboratory and mill samples. The removal of 60-80% of hydrophobic particles achieved with a low reject rate, < 2%.
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