Importance

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Abstract

A media panel for a rotating biological treatment apparatus for treating waste water, the rotating biological treatment apparatus including a rotatable shaft having a longitudinal axis and a plurality of media panel assemblies stacked on the shaft and each including a hub mounted on the shaft and a plurality of media panels mounted on the hub, the media panel comprising a planar member having a first side and a second side, and the planar member being mountable on the hub to extend normal to the longitudinal axis of the shaft to form a portion of a generally disk-shaped media panel assembly extending normal to the longitudinal axis of the shaft; the first side of the planar member including at least one first set of alternating grooves and ridges, and the second side of the media panel including at least one second set of alternating grooves and ridges; the grooves and ridges of the first and second sets of alternating grooves and ridges each having a first radially inner portion, a second radially inner portion spaced apart from the first radially inner portion, and a radially outer portion between and spaced radially outwardly with respect to the first and second radially inner portions when the media panel is mounted on the hub.

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First Claim