A flow-through fluid purification device (1), which comprises a container (5) arranged such that fluid to be purified can flow-through a volume (8) of the container (5) from an inlet (3) to an outlet (7), a receptacle (10) for accommodating a radiation source in the form of a lamp (13), wherein the receptacle (10) has an interface wall (11) permeable for radiation with a wavelength in the UV-range, preferably between 150 nm and 200 nm, more preferably of 1728 nm, and arranged to let radiation pass into the volume (8) of the container (5), a plurality of baffle plates (9) located in the volume (8) of the container (5) with an inter-baffle distance (D) in the flow direction from the inlet (3) to the outlet (7), wherein the baffle plates (9) are arranged to force the fluid flowing from the inlet (3) to the outlet (7) to flow substantially along the interface wall (11) and through gaps (G) between the interface wall (11) and the baffle plates (9) defining the shortest distance between the interface wall (11) and the baffle plates (9), and wherein the baffle plates (9) each have a surface on the upstream side in the flow direction which is perpendicular to the interface wall (11).

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.

A device for the treatment of fluids has a flow-through housing, a cover, an inlet, a reactor chamber with inner walls, an outlet and UV LED radiation sources directed into the reactor chamber, and also a power supply. The device achieves a high purifying performance with less technical complexity and less installation space and needs only little electrical power. The interior of the reactor chamber has a flow-related design. The radiation sources are arranged in the fluid on or in an inner wall and a rotating fluid vortex is imparted to a fluid flowing through by the flow-related design. The radiation sources radiate radially from the outside inward and/or laterally onto the fluid vortex. At least a partial stream of the fluid in the fluid vortex passes a number of times by the radiation sources before leaving the reactor chamber.

An ultraviolet (UV) light disinfection system for treating water prior to its delivery to a water usage device. One or more UV light emitting diodes (LEDs) are positioned within a water system floor interface in order to expose water flowing through the system to germicidal light treatment.

A flow through fluid purification device (1) comprising a container (5) arranged such that fluid can flow through a volume (8) of the container (5) from an inlet (3) to an outlet (7), and an inner cylinder (10a) inserted or insertable into the volume (8) of the container (5) and defining an interface wall (11) permeable for radiation with a wavelength in the UV-range, preferably between 150 nm and 200 nm, wherein the container (5) includes plurality of axially arranged cylinder parts (5b,5c,5d,5e) connected to each other by welding to form an outer cylinder assembly (5a).

A fluid sterilization apparatus includes: a flow passage tube in which a processing passage where a passing fluid is sterilized is formed; a first light source that irradiates the processing passage with ultraviolet light; an inflow passage formed in a direction that intersects an outer circumferential surface of the flow passage tube; and a communication passage that causes the inflow passage to communicate with the processing passage. The communication passage has a narrow passage in the middle of a path from the inflow passage toward an opening of a first end, the narrow passage being narrower than a passage toward the inflow passage.

A method of sanitising seawater at a subsea location comprises: exposing flow of seawater in a treatment reactor to UV radiation that sanitises the seawater without the addition of sanitising chemicals; and outputting the sanitised seawater from the reactor into a subsea structure such as a pipeline or a wellhead. The flow of seawater may be exposed to successive emitters of UV radiation such as pressure-compensated LEDs. The efficacy of sanitisation may be determined by: injecting a tracer fluid into the flow of seawater upstream of the reactor; and, downstream of the reactor, sensing transformation of the tracer fluid due to exposure of the tracer fluid to the UV radiation in the reactor.

This disclosure relates to a device for irradiating a flowing medium with UV radiation, comprising a flow path for the medium and a gas discharge lamp which has a lamp vessel, arranged coaxially with respect to the flow path and enclosing a plasma chamber for a lamp plasma that emits UV radiation, and an excitation coil for electrodeless inductive excitation of radiation of the lamp plasma. According to a first aspect of this disclosure, a flow conduit body is arranged in the flow path, said flow conduit body being designed to influence, by virtue of its shape and/or its position, the flow of the medium for an even radiation absorption.

A piping device for improving effects of irradiating fluid has a body, a passage module, and multiple light-emitting elements. The body has a cavity and multiple slits. The cavity is disposed inside the body. The multiple slits are disposed through the body at spaced intervals, and communicate with the cavity. The passage module has a transparent tube and a guiding component. The transparent tube is disposed in the cavity of the body. The guiding component is spiral, and is disposed in the transparent tube. The multiple light-emitting elements are mounted to the body in the multiple slits separately, and surround the passage module.

A fluid sterilization device includes: a flow passage tube having a first end and a second end opposite to the first end and defining a processing passage extending in an axial direction; a light source provided in a vicinity of the first end and radiating ultraviolet light from the first end toward the processing passage in the axial direction; and a housing that defines a straightening chamber encircling the first end from outside in a radial direction. The straightening chamber includes a communication port that serves as an inlet or an outlet for a fluid flowing in the processing passage, and communicates with the processing passage via a gap between the first end and an opposing member opposing the first end in the axial direction.