Waste water treatment substrate discs for micro-organisms assembled from segments linked to adjacent discs by bushes and side-spacers

摘要

A waste water biological treatment assembly has an aerobic treatment tank with an in-line array of pairs of semi-submerged upright rotating discs. Each disc pair is esp. segmented and presents the same horizontal and vertical dimensions whichever the current orientation. Adjacent discs are linked to each other by transverse bushes. The segments allow for free flow of water between the discs and gaps between adjacent segments. Lateral separation between adjacent discs and rigidity of the assembly is maintained by spacers.