596003 A fluid treatment apparatus for ultraviolet disinfection of fluids is disclosed. The apparatus comprises an elongate tubular duct (11) having a fluid inlet and a fluid outlet at opposite ends thereof, and an elongate source of UV radiation (17) extending longitudinally of the elongate tubular duct. A mixing device (18) is disposed between adjacent longitudinal portions of the duct divert all of the fluid flowing along the duct through fluid mixing means (see figures 4 & 5) in the mixing device and return the mixed fluid to the duct. This advantageously results in continuous and thorough mixing of the fluid.
