Patent ID: 8460548

Claim:
A wastewater treatment facility with one or more rotating biological contactors, comprising: a tank; a rotatable shaft within the tank; one or more stages for purifying incoming wastewater, at least one of the one or more stages being oriented transversely to the rotatable shaft and having one or more disk assemblies, each disk assembly having a number of disks, at least some of the disks comprising one or more concentric rings of segments disposed around an innermost monolithic primary disk, at least some of the segments outside the innermost primary disk being provided with: two generally radially extending edges; two circumferential edges that extend between the two radially extending edges; a first snap fit engagement feature extending from a side of a segment; and a second snap fit engagement feature extending from a side of another segment that enables adjacent segments of a disk to be fastened and thus cooperate to form at least a portion of a disk; at least some of the disks also having: a front face and a back face; a plurality of turbulating posts extending from the front and back faces for agitating wastewater and offering surfaces to which microorganisms may attach for consuming contaminants from the wastewater and degrading the microorganisms; a plurality of connecting extensions extending from the front and back faces, the extensions having heights that exceed a height of the plurality of turbulating posts so that adjacent disks in a disk assembly are connected and spaced apart by a mating relationship between the connecting extensions.