Patent ID: 7625490

Claim:
A nitrification-denitrification method for removing pollutants from water that utilizes magnetic seeding and magnetic separation, the method comprising the steps of: a. in a first chamber, nitrifying the water by biologically converting ammonia to nitrates; b. transferring the nitrified water to a second chamber; c. denitrifying the water in the second chamber; d. mixing magnetic bed media and a flocculant with the denitrified water and forming magnetic floc in the water, wherein the magnetic floc comprises magnetic bed media and suspended solids; e. collecting the magnetic floc on a magnetic collector; and f. removing the magnetic floc from the magnetic collector, wherein the magnetic collector for collecting the magnetic floc is disposed in the second chamber and includes a rotary magnetic collector for collecting the magnetic floc; and g. transferring the collected magnetic floc to a shearing chamber and shearing the magnetic floc to separate the magnetic bed media from sludge; and h. removing the sludge and recycling the magnetic bed media to the second chamber.