Like a cream separator in a dairy, the liquid is spun, and this separates the heavier water from the oil.
Vertical centrifuges with perforated conical discs can act as
(1) a purifier, taking a little water from mostly oil;
(2) a skimmer, taking a little oil from a lot of water (if you want to scavenge the wastewater); or
(3) a clarifier, taking a little solid from a liquid phase (in order to remove particles from oil before final filtering).
- continuous process
- more efficient - higher yield
- energy intensive