Abstract: The present invention provides a method for removing contaminants from a waste fluid stream. The method includes contacting a waste fluid stream with a promoter of hydroxyl radicals to entrain the promoter of hydroxyl radicals in the waste fluid stream, passing the waste fluid stream having the promoter of hydroxyl radicals entrained therewithin along a substantially tortuous path to allow the promoter of hydroxyl radicals to dwell within the waste fluid stream and to further entrain the promoter of hydroxyl radicals in the waste fluid stream, and irradiating the waste fluid stream with ultraviolet radiation. The present invention also provides an apparatus for removing contaminants from a waste fluid stream.

Abstract: The present invention provides a method for removing contaminants from a waste fluid stream. The method includes contacting a waste fluid stream with a promoter of hydroxyl radicals to entrain the promoter of hydroxyl radicals in the waste fluid stream, passing the waste fluid stream having the promoter of hydroxyl radicals entrained therewithin along a substantially tortuous path to allow the promoter of hydroxyl radicals to dwell within the waste fluid stream and to further entrain the promoter of hydroxyl radicals in the waste fluid stream, and irradiating the waste fluid stream with ultraviolet radiation. The present invention also provides an apparatus for removing contaminants from a waste fluid stream.

Abstract: A flexible fan which automatically reduces its pitch in response to increased rotation speed includes a hub having an axis of rotation and a plurality of blades extending radially outwardly therefrom. Each blade has a leading surface, a root portion joined to the hub, a tip portion, leading and trailing edges, and a relatively stiff leading portion joined to a relatively flexible trailing portion by a relatively narrow hinge zone which extends diagonally across the blade from generally the trailing edge of the root portion to generally the leading edge of the tip portion. A pair of stiffening ribs are provided on the leading surface of the leading blade portion which define a triangle with its base joining the hub and its apex extending toward the tip portion, one rib being adjacent and generally parallel with the hinge zone, and the other rib being spaced from and generally parallel with the leading edge.