In typical Liquid-Solid Separation applications, when should Vacuum Filtration be used and when should Pressure Filtration be employed?
If continuous separation is required, vacuum filters are preferred to batch-type pressure filters. Large Particle Size Distributions favor Vacuum Filtration while fine Particle Size Distributions favor Pressure Filtration. If the Cake Resistance Value is low, vacuum filtration will perform well. If the Cake Resistance Value is high, pressure filtration will work best.
If the process has significant variability in terms of PSD (Particle Size Distribution), TSS (Total Suspended Solids), and SG (Specific Gravity), then vacuum filter will be troublesome. Pressure filters are more forgiving with upstream changes.
If achieving low cake moisture is essential, pressure filters will outperform vacuum filters, in most cases.