A method for separating fat particles from lean particles. The method includes providing a mixture comprising a fluid, fat particles, and lean particles introducing the mixture to an inlet of a chamber, wherein the chamber has an upper outlet and a lower outlet distal to the inlet irradiating the mixture with UVc energy as the mixture is transferred through the chamber allowing particles less dense than the fluid to be carried out from the chamber through the upper outlet and allowing the particles more dense than the fluid to be carried out from the chamber through the lower outlet.
