PROCESS AND EQUIPMENT FOR RECOVERING FAT- OR PROTEIN-CONTAINING SOLID MATERIAL FROM FAT-CONTAINING SLUDGE AND/OR SEWAGE, PARTICULARLY FROM SLAUGHTERED SLUDGE AND/OR SEWAGE

摘要

PCT No. PCT/HU90/00063 Sec. 371 Date May 3, 1991 Sec. 102(e) Date May 3, 1991 PCT Filed Sep. 3, 1990 PCT Pub. No. WO91/03305 PCT Pub. Date Mar. 21, 1991.According to the process the sludge is homogenized and heated to 30 DEG -60 DEG C. temperature. The heated sludge is circulated under 2-4 bar overpressure, and its temperature is raised to about 130 DEG -150 DEG C. in 1-2 sec by conducting steam of 130 DEG -151 DEG C. and 2-4 bar pressure directly into the sludge, thus granulation is brought about in the sludge. The sludge of increased temperature -while its temperature and pressure maintained-is further circulated for about 60-300 sec. Then, the sludge is adiabatically expanded in 1-2 sec by reducing the pressure to about 0.01-0.02 bar. The expanded sludge is separated to water, fat containing water and solid impurity and wet solid phase containing protein. It is characteristic to the apparatus that it is provided with device for heating the sludge, and pipe (18) for passing on the heated sludge connected with the heating unit (5) where an expansion valve is built in. Pipe (22) joining the separating tank (7) is connected with the expansion valve (6). The apparatus is provided with separator for separation of the sludge leaving the tank (7) to water, fat and solid phase.