Abstract: Systems and methods for improving the quality of solids and liquids recovered at atmospheric pressure and temperature from a stillage stream generated as a by-product of an ethanol production process, the recovered solids having higher bio-available amino and fatty acids than evaporation-produced condensed solubles, the recovered liquids having less total solids and total suspended solids than evaporation-produced condensate. A static mixer includes an input for receiving the stillage stream combined with a GRAS anionic polymer, a cylindrical mixing chamber that controllably mixes the stillage stream and the polymer to generate wet flocculated solids and liquid co-product, and a discharge chute that outputs the wet flocculated solids and liquid co-products onto a moving, gravity filter belt having a membrane surface that separates the output from the static mixer into recovered liquids in the form of clarified, thin stillage and recovered solids in the form of dry flocculated solids.