Abstract: Provided is a water treatment apparatus that can uniformly irradiate water to be treated with ultraviolet light in sufficient irradiation quantity and in which a cleaning device and the like can be mounted easily. A water treatment apparatus that subjects water to be treated to ultraviolet treatment using ultraviolet light, the water treatment apparatus comprises: a flow channel through which water to be treated flows; and an ultraviolet irradiation portion that is located on an opposite side of the flow channel from an inlet side, and irradiates the water to be treated flowing in the flow channel with ultraviolet light via a window portion toward the inlet side, the window portion being formed by a transparent member, wherein the flow channel includes a diameter increase portion, and the diameter increase portion is provided with at least one of: a cleaning device used to clean the window portion; and a sensor.

Abstract: An inclined sedimentation acceleration apparatus includes an inclined part having a plurality of inclined flow paths through which raw water flows, and side plates disposed on both sides of the inclined part. An upper ridge part of the inclined part is disposed at a height different from that of an upper ridge part of the side plate. Suspended solids are less likely to accumulate on an upper surface of the inclined sedimentation acceleration apparatus.

Abstract: A water treatment apparatus 100 subjects water to be treated to ultraviolet treatment with ultraviolet light emitted from LED elements 31. The water treatment apparatus 100 comprises: a flow channel 10 through which water to be treated flows; an LED element housing chamber 30 located on outside of the flow channel 10, with a window portion 20 formed by a transparent member being interposed therebetween; and a plurality of LED elements 31 arranged in the LED element housing chamber 30, wherein the LED element housing chamber 30 has an inlet 34 and an outlet 35 for dry gas, and light emitting surfaces of the plurality of LED elements 31 are exposed to a space in the LED element housing chamber 30.

Abstract: A water treatment device includes: a dual-pipe structure unit including an outer pipe, an inner pipe provided in the outer pipe, and a prevention member provided between the outer pipe and the inner pipe; and a light source unit radiating ultraviolet light in the axial direction to irradiate water subject to treatment flowing in the inner pipe. The inner pipe includes an opposing end facing the light source unit across a gap and an inflow end positioned opposite to the opposing end. The outer pipe includes an outflow port provided on an outer circumferential surface of the outer pipe. The water subject to treatment flowing out of the inner pipe via the gap flows out from the outflow port.

Abstract: A water treatment apparatus 100 subjects water to be treated to ultraviolet treatment with ultraviolet light emitted from LED elements 31. The water treatment apparatus 100 comprises: a flow channel 10 through which water to be treated flows; an LED element housing chamber 30 located on outside of the flow channel 10, with a window portion 20 formed by a transparent member being interposed therebetween; and a plurality of LED elements 31 arranged in the LED element housing chamber 30, wherein the LED element housing chamber 30 has an inlet 34 and an outlet 35 for dry gas, and light emitting surfaces of the plurality of LED elements 31 are exposed to a space in the LED element housing chamber 30.

Abstract: Provided is a water treatment apparatus that can uniformly irradiate water to be treated with ultraviolet light in sufficient irradiation quantity and in which a cleaning device and the like can be mounted easily. A water treatment apparatus that subjects water to be treated to ultraviolet treatment using ultraviolet light, the water treatment apparatus comprises: a flow channel through which water to be treated flows; and an ultraviolet irradiation portion that is located on an opposite side of the flow channel from an inlet side, and irradiates the water to be treated flowing in the flow channel with ultraviolet light via a window portion toward the inlet side, the window portion being formed by a transparent member, wherein the flow channel includes a diameter increase portion, and the diameter increase portion is provided with at least one of: a cleaning device used to clean the window portion; and a sensor.

Abstract: A water treatment device includes: a dual-pipe structure unit including an outer pipe, an inner pipe provided in the outer pipe, and a prevention member provided between the outer pipe and the inner pipe; and a light source unit radiating ultraviolet light in the axial direction to irradiate water subject to treatment flowing in the inner pipe. The inner pipe includes an opposing end facing the light source unit across a gap and an inflow end positioned opposite to the opposing end. The outer pipe includes an outflow port provided on an outer circumferential surface of the outer pipe. The water subject to treatment flowing out of the inner pipe via the gap flows out from the outflow port.

Abstract: An inclined sedimentation acceleration apparatus 100 includes an inclined part 10 having a plurality of inclined flow paths 30 through which raw water flows, and side plates 20 disposed on both sides of the inclined part 10. An upper ridge part 15 of the inclined part 10 is disposed at a height different from that of an upper ridge part 21 of the side plate 20. Suspended solids are less likely to accumulate on an upper surface of the inclined sedimentation acceleration apparatus 100.