SYSTEM FOR TREATING LIQUIDS BY APPLYING ULTRA-VIOLET RADIATION

A liquid treatment system (2) comprising a liquid enclosure (4) having a main axis A, at least one ultra-violet (UV) light source (6) with an extension along said main axis and configured to emit UV light to a liquid in the liquid enclosure (4). The liquid enclosure comprises at least one liquid section (8) with an extension along the main axis and structured to contain the liquid. The system (2) comprises swirl generating members (12) configured to generate a swirling motion of the liquid around a swirling axis S in the at least one liquid section (8) wherein the swirling axis is essentially parallel to the main axis, wherein the swirling motion is such that a controlled varying distance is induced to essentially all liquid elements of the liquid in relation to said light source (6) such that essentially all liquid elements are moved into high UV radiation zones closest said UV transparent wall (10), to achieve uniform UV radiation of the liquid.