Abstract: A dissolved gas flotation pressure reduction nozzle (60) comprises: an integrally molded plastics component (61) comprising a discharge spout (62), an impingement plate (64) and one or more fins (66) extending from the impingement plate (64) in the radially outwards and downstream directions; and a control plate (75) upstream of the impingement plate (64).

Abstract: A dissolved gas flotation apparatus (10) comprises: —a flotation tank (18) having an upstream contact zone by a baffle (9) from a downstream clarification zone; —one or more pressure reduction nozzles (28) arranged to discharge into the contact zone of the flotation tank (18); —a flow-straightening arrangement including two or more plate-like barriers (104) in the contact zone of the flotation tank (18), wherein: each barrier (104) has walls, the walls of the barriers (104) together defining flow paths in a desired direction; and each barrier (104) provides a barrier to horizontal flow perpendicular to the desired flow direction.

Abstract: A dissolved gas flotation apparatus (10) comprises: —a flotation tank (18); —one or more pressure reduction nozzles (28) arranged to discharge into the flotation tank (18); —an underflow exit baffle (19) defining the upper part of an exit channel (70) from the flotation tank (18); and —a plurality of flow-contacting members (44) arranged within the flotation tank exit channel. The flow-contacting members (44) may include one or more of vanes; bubble-forming members; bubble-capturing members; bubble-coalescing members; turbulence-introducing members; flow-redirecting members; pressure-increasing or pressure-decreasing members; members which introduce a pressure difference in the flow; and velocity-increasing or velocity-decreasing members.

Abstract: A dissolved gas flotation pressure reduction nozzle (60) comprises: an integrally moulded plastics component (61) comprising a discharge spout (62), an impingement plate (64) and one or more fins (66) extending from the impingement plate (64) in the radially outwards and downstream directions; and a control plate (75) upstream of the impingement plate (64).

Abstract: The present invention relates to fluid processing apparatus for use in an elongate passage (10), the apparatus comprising a plurality of means for applying ultrasonic energy (12) to fluid within the passage positioned axially along the elongate passage, wherein axially adjacent means for applying ultrasonic energy are radially non-parallel and radially non-opposing.

Abstract: The present invention concerns apparatus for applying ultrasonic energy which comprises an applicator (1) having an outwardly facing surface, the apparatus further including an extender (6) which extends from the outwardly facing surface, and at least one booster (7) at the end of the extender remote from the applicator for boosting ultrasonic energy applied thereto to cause the applicator to oscillate, wherein the applicator, extender and booster are integrally formed. The invention also concerns the manufacture of the apparatus.

Abstract: The present invention relates to fluid processing apparatus for use in an elongate passage (10), the apparatus comprising a plurality of means for applying ultrasonic energy (12) to fluid within the passage positioned axially along the elongate passage, wherein axially adjacent means for applying ultrasonic energy are radially non-parallel and radially non-opposing.