Fermenters and bioreactors can entrain culture liquid through bubble bursting and foam collapse. Mist elimination can protect downstream filters and reduce product carryover, but cleanability, material construction, batch gas-flow variation, and sanitary requirements are critical.

Vacuum pump inlet demisters must remove process droplets and condensate while adding minimal suction pressure drop. Actual gas volume, pump tolerance, fouling, downstream condensation, liquid slugs, and vacuum-sealed drainage all affect separator design.

Mist carryover can foul or corrode downstream heat exchangers when droplets containing salts, acids, alkalis, or solids deposit on heat-transfer surfaces. Upstream mist removal should be coordinated with downstream condensation and exchanger pressure-drop requirements.

Tray columns generate entrainment through froth, gas jets, and bubble breakup. High vapor rate, reflux, tray flooding, or tray damage can sharply increase overhead demister liquid load and affect product purity.

Wet-stack droplet rainout can result from demister carryover, stack-wall condensation, liquid-film stripping, duct condensate, or wash-cycle events. A normal-looking plume does not prove zero liquid fallout, and downstream liquid chemistry can help identify the source.