Abstract: A process is disclosed for concentrating a fatty sludge precipitated from a fatty and proteinaceous aqueous emulsion by successive addition of hydrolyzable metals salts and alkaline earth salts thereto and subsequently separated from the aqueous portion of the emulsion, comprising acidifying the separated fatty sludge with mineral acid and allowing a supernatant concentrated sludge to form above an aqueous phase. The supernatant concentrated sludge which is formed may be heated preferably to boiling either separately or without separation from the aqueous phase to further concentrate the sludge and produce a fatty acid containing supernatant phase. The chemicals originally used for precipitating the fatty sludge may be recovered from the aqueous phase.