Patent ID: 11932561
Assignee: CNP CYCLES GMBH
Field: Environmental technology (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 0:
1. A method for recovering magnesium ammonium phosphate (MAP) from a sludge, comprising:
providing a first reaction tank containing the sludge;
providing a second reaction tank connected to the first reaction tank via a supply line;
creating an aerobic environment and an alkaline environment in the first reaction tank by CO2 stripping;
circulating the sludge in the first reaction tank, which includes introducing air into the first reaction tank;
adding cationic magnesium to the sludge in the first reaction tank to form MAP crystals in the sludge;
transferring the sludge containing the MAP crystals from the first reaction tank to the second reaction tank via the supply line;
setting an anaerobic environment in the second reaction tank to allow phosphorus release from the sludge and formation of additional MAP crystals in the second reaction tank;
supplying MAP crystals from the second reaction tank to the first reaction tank;
grading the MAP crystals in the first reaction tank by introducing air;
collecting the MAP crystals in an extraction device from a lower conical- or funnel-shaped section of the first reaction tank; and
recovering the MAP crystals from the extraction device.