Abstract: A source of light comprising a first tube comprising a first lumen sealed by a distal cap and a proximal cap a plurality of LED sources having each a front, light-emitting side and a back side, the back side of the LED sources being attached to an outer surface of the first tube, a second tube having a proximal end and a distal end, the second tube passing through the proximal cap such that the distal end of the second tube opens within the first lumen closer to the distal cap than to the proximal cap, and the proximal end of the second tube opens outside of the proximal cap; and at least one third tube passing through the proximal cap.

Abstract: A sterilizing device includes a pipe having an inlet and an outlet and allowing fluid to move therethrough and a light source provided on one side of the pipe and providing light to the fluid. At least a portion of the pipe is provided in a spiral shape and the inlet and/or the outlet are arranged in a light emitting region.

Abstract: Systems and methods are provided for disinfecting a cabin of a vehicle. In one example, a disinfection system comprises a controller, an ultraviolet radiation source, an air duct, and a steerable optical system. The ultraviolet radiation source is in communication with the controller, disposed within the air duct, and configured to emit ultraviolet radiation. The air duct comprises an inlet configured to receive air particles from within the cabin. The air duct comprises one or more internal reflective surfaces configured to reflect the ultraviolet radiation so as to disinfect the air particles within the air duct. The air duct comprises an outlet configured to transmit the disinfected air particles out of the air duct via the outlet. The steerable optical system is coupled to the air duct and configured to receive and selectively direct the ultraviolet radiation to disinfect the cabin. Additional systems and related methods are provided.

Abstract: An air disinfection device includes: a housing that includes an inlet port for taking air therethrough and a disinfection chamber that has a shell in a shape of a truncated ellipsoid. The device also includes: a disinfection head that is disposed in the inlet port and includes a light source for generating disinfection light that disinfects the air in the disinfection chamber, where the light source is located substantially on a plane where a first focal point of the truncated ellipsoid is located. The disinfection head further includes a fan for taking the air through the inlet port to the disinfection chamber and a filter for filtering the air. The device further includes a power source electrically coupled to the disinfection head and configured to provide electrical power for the disinfection head.

Abstract: A method of sterilizing a vehicle interior using a drone includes: receiving information on whether a passenger is boarding or the passenger has initiated a sterilization request; and when the passenger does not ride in a vehicle or the sterilization request is received from the passenger, performing, with a drone, a set of instructions to implement a sterilization logic. In particular, the sterilization logic includes determining an infected area using a sensor part, and allowing the drone to fly and performing intensive sterilization in the infected area.

Abstract: A method for collecting a sterilized fluid includes passing a fluid through an inlet stem and into a chamber of a storage container so that the fluid collects within the chamber of the storage container; and applying a beam of radiation to the inlet stem so that the beam of radiation passes through the inlet stem and through at least a portion of the fluid passing through the inlet stem, the beam of radiation at least partially sterilizing the fluid passing through the inlet stem and into the chamber of the storage container.

Abstract: A UV reactor for disinfecting water. The UV reactor may include a cooling chamber in which heat from a UV source may be transferred to the water flowing through the UV reactor. The UV reactor may include driver circuitry operable to determine status information, such as health, of the UV source. The UV reactor may include a gas discharge path operable to substantially prevent accumulation of gas within a water treatment chamber.

Abstract: An apparatus for the treatment of a liquid that includes a chamber having at least one inner surface, the chamber adapted for passage of a fluid therethrough. The chamber is at least 80 percent enclosed. The apparatus also includes an optional ultraviolet-transmissive tube disposed within the chamber and also adapted for the passage of the liquid therethrough. The apparatus further includes an ultraviolet lamp disposed within the chamber and, optionally, within the ultraviolet-transmissive tube. A reflective material is interposed between the chamber and the transmissive tube. The reflective material is adapted so as to reflect at least a portion of light emitted by the ultraviolet lamp, wherein the reflective material is at least 80 percent reflective.

Abstract: A water quality measurement device 1 includes a twin tube excimer lamp 2. The inflow pipe 3 is connected to one end of the inner tube 21 of the excimer lamp 2, and the outflow pipe 4 is connected to the other end of the inner tube 21 of the excimer lamp 2. The detector 5 that measures the conductivity of sample water is interposed in the outflow pipe 4. In the water quality measurement device 1, sample water sequentially flows through the inflow pipe 3, the inner tube 21 of the excimer lamp 2, and the outflow pipe 4. Hence, the channel in the water quality measurement device 1 can be simplified. Additionally, the sample water is oxidized by being irradiated with UV light in the inner tube 21 of the excimer lamp 2. Hence, it is possible to irradiate the sample water with UV light from the excimer lamp 2 efficiently.

Abstract: A system includes a first chamber, a second chamber, an ultraviolet light source and a microwave source. The first chamber includes an inlet. The second chamber is adjacent the first chamber and includes an outlet and a waveguide. The ultraviolet light source resides within the waveguide of the second chamber. Related apparatus, systems, techniques and articles are also described.

Abstract: A microfluidic photoreactor for treating excess bilirubin in blood, having: a microfluidic channel module; an illumination module comprising one or more illumination sources disposed about the microfluidic channel module and configured to illuminate blood passing through at least one microfluidic channel of the microfluidic channel module; and a heat exchanger module coupled to the at least one microfluidic channel module, wherein the heat exchanger module is configured to extract heat from the at least one microfluidic channel. A system including a microfluidic photoreactor and a method of treating excess bilirubin in blood.

Abstract: A water-disinfecting apparatus includes a vessel with a cathode, an insert with a photoanode, an ultraviolet light source configured to be positioned in the insert, and a power source. The cathode forms an electrically conductive layer on an inner surface of the vessel. The photoanode is configured to be positioned in the cathode. The power source is configured to be operably coupled to the cathode, the photoanode, and the light source.

Abstract: A ceiling fan and a surrounding device thereof are provided. The ceiling fan includes a main body, a bracket set connected to the main body, and a surrounding device connected to the bracket set. The main body includes a main shaft, a motor, and a plurality of ceiling fan blades. The bracket set includes a plurality of brackets, and each of the brackets has one end connected to the main shaft. The surrounding device is connected to another end of each of the brackets that is relatively far away from the main shaft, and the surrounding device is roundly arranged around and spaced apart from an end of each of the ceiling fan blades that is relatively far away from the motor. The surrounding device includes at least one functional component that is configured to disinfect or sterilize air or to provide lighting.

Abstract: The invention relates to a measuring cell for analysing a fluid flow, wherein the measuring cell has a channel for conducting the fluid flow, which channel is divided into different sections and the cross section thereof is perpendicular to a longitudinal axis. The invention also relates to a measuring device comprising such a measuring cell.

Abstract: A gas irradiation system has an irradiation chamber having a plurality of irradiation compartments disposed circumferentially about a central axis. One of the compartments is an inlet compartment. The inlet compartment has an aperture at the bottom through which gas flows from the compartment. A UV LED is disposed within or adjacent to the aperture, where the UVC LED is configured to irradiate the gas and neutralize pathogens. Circumferentially adjacent to one side of the inlet irradiation compartment is an outlet irradiation compartment. Circumferentially adjacent in the opposite circumferential direction on the other side of the inlet radiation compartment is the first of a plurality of intermediate irradiation compartments. These intermediate compartments extend circumferentially about the central axis between the inlet compartment and the outlet compartment. The gas flows sequentially through each of the irradiation compartments, being irradiated in each compartment.

Abstract: A heating device (124) for heating particles to be freeze-dried in a rotary drum (102) of a freeze-dryer (100) is provided, the device comprising at least one radiation emitter (202) for applying radiation heat to the particles, and a tube-shaped separator (204) for separating the particles from the at least one emitter (202), The separator (202) being integrally closed at one end and separating an emitter volume (206) encompassing the at least one emitter (202) from a drum process volume (126) inside the drum (102), wherein the heating device (124) protrudes into the drum process volume (126) such that said integrally closed end of the separator (204) is arranged inside the drum (102) as a free end.

Abstract: A method and system for metering proppant discharged from a storage container is disclosed. In certain embodiments, a method may comprise loading a known amount of a first proppant type into a storage container, detecting proppant at or adjacent to a discharge outlet of the storage container via one or more sensors coupled to the storage container, operating a metering device at a predetermined speed, wherein the metering device may be coupled to the discharge outlet of the storage container, and wherein the metering device may comprise one or more pockets for receiving the first proppant type. In certain embodiments, the method may further comprise dispensing a known amount of the first proppant type from the storage container via the metering device, wherein an encoder coupled to the metering device may emit pulses during the dispensing.

Abstract: A method and apparatus for treating a liquid using ultraviolet radiation. A thin flow of liquid in a supercritical flow is irradiated by at least one radiation source external to the thin flow. The flow may desirably have a Froude number greater than 3 and a velocity greater than 0.8 m/s. The apparatus for treating a liquid including may have a reservoir supplying liquid though a slot into an open channel to generate a thin flow of liquid having a supercritical flow along the channel with at least one radiation source external to the thin flow to irradiate the thin flow.

Abstract: A method for optically examining a plurality of microscopic samples. The samples are channeled one after the other by means of a flow into at least one flow channel in which the samples advance along a flow direction. The samples are illuminated, and light emitted from the samples is detected and analyzed. A device for carrying out the method in which samples are illuminated in that at least one light sheet with a light sheet plane is directed onto the at least one flow channel, wherein the light sheet is oriented so as to intersect the at least one flow channel in an intersection region, and the normal of the light sheet plane forms an angle differing from null together with the flow direction in the intersection region. The light emitted from the sample is registered by an imaging optical detection unit, and the focal plane of said optical detection unit lies in the intersection region.

Abstract: A process is disclosed for treating water, such as wastewater, with ozone under alkaline and acidic conditions to decompose and remove acrolein and acrolein byproducts from the water and/or wastewater. The process is able to lower the concentration of acrolein and acrolein byproducts from water to a sufficiently low level suitable for discharge to a municipal sewer collection system with reduced occurrence of the decomposition by-products of acrolein converting back to acrolein in the water. One embodiment of the process treats contaminated water containing acrolein with ozone by sparging or bubbling ozone through the contaminated water. The contaminated water can be treated with ozone where the contaminated water is initially adjusted to a pH greater than 7.0 for a time to convert at least a portion of the acrolein to 3-hydroxypropanal to obtain a partially treated water. The pH of the partially treated water is then adjusted to a pH below 7.

Abstract: Systems and methods for decontaminating a surgical drain and its reservoir are provided. An apparatus is provided in the form of a container having an interior chamber and an expansible opening to the interior chamber for insertion of a surgical drain therethrough. Ultraviolet light emitters are disposed within the interior chamber to emit beams of ultraviolet radiation at the surgical drain and/or its reservoir, thereby killing or neutralizing bacteria and fungus on the drain. Walls forming the expansible opening are collapsible to abut a portion of the inserted drain when inserted into the apparatus, and a fluid tight seal is formed between the drain and the apparatus.

Abstract: This invention is directed to a method, system and apparatus for the treatment fluids. An apparatus for the treatment of a fluid comprises a fluid chamber and at least one ultraviolet light unit arranged at a periphery of the fluid chamber. The at least one ultraviolet light unit comprises at least one ultraviolet light emitting diode and an ultraviolet light directing element. The ultraviolet light directing element is configured to collimate at least a portion of the light emitted from the at least one ultraviolet light emitting diode in use such that the ultraviolet light rays emitted from each ultraviolet light unit are parallel in a first plane. Also described is a method for the cooling a light emitting diode in a fluid treatment system.

Abstract: A method for evaluating an air purification system. The method includes generating, with an air flow generator, a flow of air through a test filter so that an upstream air flow exists an upstream side of the test filter and a downstream air flow exists on a downstream side of the test filter. A multiple contaminant mixture is injected, with a fluid injector, into the upstream air flow. Downstream concentrations for each contaminant of the multiple contaminant mixture in the downstream air flow are measured with a contaminant measurement device. Test filter breakthrough curves for each contaminant of the multiple contaminant mixture in the downstream air flow are generated based on the downstream concentrations for each contaminant of the multiple contaminant mixture.

Abstract: Water disinfecting modules, water supply systems, methods of assembling a water supply system as well as method of disinfecting water are provided. The water disinfecting module includes a frame, hot and cold water flow switches and hot and cold UV treatment modules is provided. The frame supports a hot and cold water inlets and hot and cold water outlets. Hot and cold water flow switches are fluidly interposed between the respective inlets and outlets for sensing water flow. Hot and cold water UV treatment modules are fluidly interposed between corresponding inlets and outlets and are coupled to flow switches for activation upon sensing of water flow. All of the components are supported by the frame to form a complete unit. The systems and methods incorporate the use of such a water disinfecting module.

Abstract: An improvement to UV sterilization and disinfection devices and methods is disclosed. An apparatus for sterilization and disinfection includes: a compact, highly effective air sterilization and disinfection apparatus, which delivers clean, pure air directly into a blower/warmer device for clean and effective management of patient body temperature.

Abstract: An apparatus for applying a liquid medium irradiated with UV radiation onto a substrata includes a housing having an elongated chamber, at least one inlet opening, and a slit shaped outlet opening opposite the inlet opening. A tube element extends through the chamber and is at least partially transparent to UV radiation. A flow space symmetric with respect to a longitudinal center plane of the chamber is formed between the tube element and a wall of the chamber. The longitudinal center plane dissects the outlet opening in its middle such that the tube element extends into the slit shaped outlet opening to form two longitudinally extending outlet slits between the tube element and the housing. At least one UV-radiation source in the tube element is arranged to emit UV-radiation in the direction of the flow space and through the outlet slits.

Abstract: An apparatus for treating air includes a housing with an air inlet and an air outlet, the housing enclosing an air treatment zone and an ozone removal zone, wherein the ozone removal zone is positioned downstream of the air treatment zone with respect to a flow direction of the air being treated, an ultraviolet (UV) light source in the air treatment zone configured to generate ozone from the air, wherein the UV light from the UV light source and the ozone generated by the UV light source treat the air in the air treatment zone, catalyst in the ozone removal zone that removes at least a portion of the ozone generated by the UV light source, and an air mover positioned near the air outlet configured to draw the air through the air inlet into the air treatment zone from outside the housing.

Abstract: An air particulate detection system is provided. The air particulate detection system comprising: an aspiration particulate detection system; one or more pipe runs fluidly connected to the aspiration detection system, wherein each of the one or more pipe runs includes one or more sampling points configured to allow an air particulate entry into at least one of the one or more pipe runs; and a secondary particulate detector fluidly connected to the aspiration particulate detection system through the one or more pipe runs, wherein the secondary particulate detector is in communication with the aspiration particulate detection system.

Abstract: A multifunctional microwave plasma and ultraviolet light deodorization treatment unit, which includes: a rapid decomposition device (1), a high frequency plasma electric field (2), a microwave plasma electric field (3), a high intensity ultraviolet radiation field (4), a low temperature plasma electric field (5), a high intensity ozone gas reaction chamber (6), a reaction termination chamber (7) and a clean gas organization chamber (8) sequentially installed inside a horizontal rectangular box which has an elongated body defining a horizontal axis and has a channel cavity therein. The deodorization treatment unit further includes an exhaust gas odor collecting pipe and an odor gas storage cabinet (9) connected to an air pump (10), the air pump (10) is connected to an odor gas inlet of the rapid decomposition device (1), the clean gas organization chamber (8) has one end connected to a clean gas exhaust pipe.

Abstract: A device for inactivating or reducing an amount of biological contaminants in human milk comprises an interior for taking in human milk to be treated in order to inactivate or reduce the amount of biological contaminants, and at least one UV lamp for irradiating the milk being in the interior in order to subject it to the treatment. The treatment is a first function of the device, wherein the device has a second function, the device being capable of fulfilling the first function at the same time as the second function, wherein the second function is one or more of milk expressing, milk collecting, milk storing, milk warming, milk feeding, milk processing and milk handling.

Abstract: A UV water treatment system comprising a reactor unit for receiving water therein and a power unit for powering the UV water treatment system. The reactor unit includes a housing and a pair of end caps that sealingly engage the housing at opposing ends. Optionally, the UV water treatment system may have a reduced footprint.

Abstract: A flow reactor for photochemical reactions comprises an extended flow passage (20) surrounded by one or more flow passage walls (22), the flow passage having a length and a light diffusing rod (30) having a diameter of at least 500 ?m and a length, with at least a portion of the length of the rod (30) extending inside of and along the flow passage (20) for at least a portion of the length of the flow passage (20).

Abstract: A heating, ventilating and air conditioning (HVAC) unit. The unit comprises a heat exchanger or drain pan located inside a HVAC housing that has one or more access openings and ultraviolet light-sensitive components therein. The unit also comprises a light located inside of the HVAC housing and a light shield located between the heat exchanger or drain pan and the light source. The light source includes a network of open-ended cells, each cell having ultraviolet light reflective walls. The light shield is oriented to direct an ultraviolet light from the light source through the open-ended cells towards the heat exchanger or drain pan and away from the one or more access openings and ultraviolet light-sensitive components.

Abstract: A processing liquid supplying apparatus is arranged to discharge a processing liquid from a discharge port to supply the processing liquid to a processing object, and the processing liquid supplying apparatus includes a first piping, through the interior of which the processing liquid can flow, the interior of the first piping being in communication with the discharge port, and an X-ray irradiating means irradiating X-rays onto the processing liquid present inside the first piping. The first piping has an opening in its pipe wall and the opening is closed by a window member formed using a material that can transmit the X-rays, and the X-ray irradiating means irradiates the X-rays onto the processing liquid present inside the first piping via the window member.

Abstract: A solution for disinfecting a fluid, colloid, mixture, and/or the like using ultraviolet radiation is provided. An ultraviolet transparent enclosure can include an inlet and an outlet for a flow of media to be disinfected. The ultraviolet transparent enclosure includes a material that is configured to prevent biofouling within the ultraviolet transparent enclosure. A set of ultraviolet radiation sources are located adjacent to the ultraviolet transparent enclosure and are configured to generate ultraviolet radiation towards the ultraviolet transparent enclosure.

Abstract: The invention provides an apparatus and a process for continuous virus inactivation. The apparatus for continuous virus inactivation in a product stream comprises a tube or hose 1 having an inlet 4 and an outlet 5 in each case connected to a product flow line 8 for conveying the product stream, where the tube or the hose 1 is curved and/or helically coiled with a number n of windings around a coil axis h and has one or more changes in direction and/or bends 2 in the coil axis h having an angle ? of from 45° to 180° to alter the direction of action of the normals of the centrifugal force and the apparatus is characterized by a Dean number>0 and a torsion parameter>0.

Abstract: A sterilization assembly for sterilizing personal hygiene implements includes a housing that may contain a plurality of personal hygiene implements. The housing has a top portion hingedly coupled to a bottom portion. A sterilization unit is coupled to the housing wherein the sterilization unit may sterilize the personal hygiene implements.

Abstract: A challenge in using recycled material in the papermaking process is the presence of hydrophobic organics with adhesive properties commonly known as “stickies.” Hydrophobic agglomerates can result in spots or defects in the final paper product or deposit on papermaking equipment resulting in poor runnability and downtime. Technologies for monitoring and controlling microstickies exist. However, a need exists for a technique to rapidly determine the size and content of macrostickies (diameter>100 microns) in recycled pulp process streams. The present invention is a device and method to perform real-time macrostickies and/or any visible hydrophobic particle analysis in an aqueous medium. Using the present invention, furnish quality can be monitored and treatment performance can be monitored and controlled. The technique is based on fluorescence image analysis to identify and count sticky particles as well as measure their size.

Abstract: Embodiments of the invention include an elongate chamber. A UV source includes a semiconductor device, the semiconductor device including an active layer disposed between an n-type region and a p-type region. The active layer emits radiation having a peak wavelength in a UV range. The semiconductor device is positioned on a wall of the elongate chamber. An inner surface of the elongate chamber is reflective.

Abstract: Systems and methods for air purification within an incubator using germicidal irradiation from an ultra-violet (UV) light source that is integrated in a path from ambient air into the cavity of an incubator.

Abstract: The ceiling fan with air ionizing fan blades includes at least one air ionizing member secured to a top surface of a fan blade, and which electrostatically purifies air regardless of whether the ceiling fan is operating. The air ionizing member is integrated along a top surface as well as a leading edge of the fan blade, and shall collect particulates thereon for later removal. The air ionizing member is in wired communication with an electrical source that provides a high voltage needed for the air ionizing member to generate negative ions. The air ionizing member includes an electrostatically charged plate that produces positively or negatively charged gas ions that particulates stick to in a manner similar to static electricity. The air ionizing member may be a permanent fixture of or a removable component to the respective fan blade.

Abstract: A UVC radiation system for producing decontaminated air which flows into the surroundings of the system while blocking UVC radiation from entering the surrounding environment. In one embodiment, the system comprises a first housing forming a first air chamber and having multiple side walls each having one or more UVC lamps adjacent thereto. Each side wall has air vent openings in a pattern which confronts substantially the entire length of the one or more adjacent lamps. A second housing surrounds the first housing and lamps and forms a second air chamber having one or more walls containing an air filter to permit air to flow through the filter into the surrounding environment and to prevent UVC radiation from entering the environment.

Abstract: An apparatus and method for modifying the organoleptic properties of a beverage, such as wine in a bottle, said apparatus having a least one light-source, said light-source applying peak wavelengths at intensities and time durations optimal for modifying said beverage's organoleptic properties.

Abstract: There is provided a treatment device for disinfecting a fluid being configured as a conduit for conveying a flow of fluid to be treated, said device being toroidal-shaped with an inner concave parabolic surface, wherein the device is provided with apertures extending from the outer to the inner surface of the toroidal-shaped device; one or more UV LED(s) provided in the apertures thereby enabling emitted light to be transmitted through the apertures into the interior part of the device for disinfecting said fluid; a power source for powering the UV LEDs, wherein the inner surface is made from a light reflecting material, and the apertures are sealed in the ends extending into the interior part of the device by a UV-transparent material.

Abstract: The invention described herein contains two aspects, usable together or separately, that address the needs in the art described above, namely a first aspect that relates to the provision of a transportable water purification system that can be contained on a passenger transport vehicle, and that can use, but does not require, continuous, real-time monitoring, and a second aspect that relates to the use of UV purification of the water as it is uploaded to the passenger transport vehicle after a single pass through the UV chamber.

Abstract: This invention relates to an air purification apparatuses and methods for air purification. The air purification apparatuses pass air through energy beams that form one or more fields of energy within a chamber to produce an outflow of sterilized air. In some aspects, a charge generation system is implemented to repel particles from the chamber walls. In some aspects, the fields of energy extend across substantially an entirety of the cross sectional area of the interior volume of the chamber and longitudinally within the chamber. In some aspects, a controller is configured to rotate a beam of collimated light energy within the chamber at a rotational velocity corresponding to at least V/W, wherein V is the linear velocity of a particle within the chamber along the longitudinal axis, and W is the width of the beam of collimated light energy.

Abstract: A water sanitizing system including a supply system having a supply conduit with a conduit length; a light-diffusing optical fiber in the conduit that substantially spans the conduit length; and an ultraviolet light source configured to inject ultraviolet light rays into the fiber. The fiber includes: (a) a first end and a second end, the ends defining a fiber length, (b) a core region comprising fused silica having a plurality of scattering sites, and (c) a cladding over the core region, the cladding having an outer photocatalyst region doped with a metal oxide. The cladding may comprise a polymer coating. The fiber is configured to propagate the light rays from the first end toward the second end of the fiber, and scatter the rays in substantially radial directions out of the core region of the fiber at the plurality of scattering sites, and through the photocatalyst region.

Abstract: A light source, with electrodes of alternating polarity attached to a substrate in an excimer ultraviolet (UV) lamp, for generating a plasma discharge between each of the electrodes. The shape of the substrate can shape and control the plasma discharge to reduce exposure of materials susceptible to attack by the halogens. The electrodes can be located such that the plasma discharge occurs in a region where it produces less contact of the halogens with the vulnerable areas of the lamp enclosure. The materials, such as the electrodes, substrate, and envelope, can be selected to withstand corrosive materials. In another embodiment, a plurality of sealed tubes, at least some of which contain an excimer gas are positioned between two electrodes.

Abstract: A sterilizer for water, with pump, particularly for aquariums, comprising at least one element for irradiation of ultraviolet rays, and at least one duct portion for the passage of the water to be sterilized, which faces the irradiation element, the duct portion being permeable to ultraviolet radiation irradiated during use by the irradiation element, a pump for supplying water to the duct portion, a structure for hanging from a rim of a wall of a tank, which has a first supporting portion for the intake of the pump and a second supporting portion for the irradiation element and for the duct portion that faces it.

Abstract: A sterilization device includes a housing having a flow passage R of a fluid that is to be sterilized; and an LED element being disposed in the housing to irradiate ultraviolet light into the flow passage R, wherein an inner wall surface of the flow passage has a pair of reflection surfaces (a first reflection surface and a second reflection surface) which directs the ultraviolet light irradiated from the LED element from one side of the flow passage R to another side thereof while reflecting the ultraviolet light a plurality of times; and a return surface that includes a surface that is perpendicular to an optical axis of the light which has been reflected a plurality of times from one side to the other side, and returns the light toward its original direction is formed on a side of the first reflection surface.