NOVELTY - A plant for the treatment of biological sludges with recovery of secondary raw materials and energy comprises: a feed section (1) of biological sludges; a feed section (2) of primary and secondary raw materials required for operation of the plant; where it comprises: a section (3) for the treatment of biological sludges where, through a reactor (303), a process of alkaline protein lysis is performed at medium-low temperature, through dosage of a calcium or sodium hydroxide.    USE - The plant is useful for the treatment of biological sludges with recovery of secondary raw materials and energy (claimed).    ADVANTAGE - The plant efficiently segregates and separates the most dangerous part contained in sludges, constituted by heavy metals, from the more precious protein part, and destroys pathogenic agents.    DETAILED DESCRIPTION - A plant for the treatment of biological sludges with recovery of secondary raw materials and energy comprises: a feed section (1) of biological sludges; a feed section (2) of primary and secondary raw materials required for operation of the plant; where it comprises: a section (3) for the treatment of biological sludges where, through a reactor (303), a process of alkaline protein lysis is performed at medium-low temperature, through dosage of a calcium or sodium hydroxide, obtaining a suspension comprising a protein broth and a suspended body composed of the calcium or sodium hydroxide, of the non-solubilized organic fraction and of the particulate of the hydroxides of the polluting metals contained in the sludges and where, through a forced filtration device (304) of the suspension, separation of the liquid protein lysate from the cake of suspended particulate is obtained.    DESCRIPTION OF DRAWING(S) - The drawing shows a general block diagram of the sections constituting a plant for the treatment of biological sludges with recovery of secondary raw materials and energy.    Feed section (1, 2)    Section for alkaline lysis treatment (3)    Section for conventional anaerobic treatment of biological sludges (4)    Section for non-conventional thermophilic aerobic treatment of organic wastes (5)    Section for energy recovery (6)    Section for recovery of secondary raw materials (7)    Section for recovery of lime inside the plant (8)    Section for conventional purification and recovery of treated process waters (9)