A fluid treatment apparatus comprises a plurality of elongate UV lamps 13
mounted
in a duct 10 and a cleaning assembly 14 comprising a plurality of
cleaning heads 20 which are rotated around respective lamps and are simultaneously
driven longitudinally thereof to clean the lamps 13 and the internal surface
of the duct 10. The cleaning heads 14 each comprise a plurality of
portions 28 of titanium dioxide which are biased against the surface of
the respective lamps 13 and which produce hydroxyls and oxygen free radicals
in the presence of water and oxygen. Hydroxyls and oxygen free radicals are highly
reactive and will break down the cells and molecules of the accumulated material
on the lamps.
