Water quality measurement device and water quality measurement method

Patent metadata

Field	Value
Publication number	US-11739006-B2
Application number	US-201816624091-A
Country	US
Kind code	B2
Filing date	Jun 20, 2018
Priority date	Jun 21, 2017
Publication date	Aug 29, 2023
Grant date	Aug 29, 2023

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.

First claim

The invention claimed is:

1. A water quality measurement device comprising:
a UV light irradiation portion that has a passage region through which sample water passes and irradiates the sample water with UV light from around the passage region;
an inflow pipe that is arranged to allow sample water to flow into the passage region;
an outflow pipe that is arranged to allow the sample water, which has been oxidized by being irradiated with UV light by the UV light irradiation portion, to flow out of the passage region, the outflow pipe being located downstream of the passage region;
a heat dissipation portion that dissipates heat of the sample water, the heat dissipation portion being provided on the outflow pipe; and
a detector that detects a degradation product that has flowed out into the outflow pipe, the detector being located downstream of the heat dissipation portion,
wherein:
the UV light irradiation portion is a twin tube excimer lamp that has an inner tube in which an internal space is formed as the passage region and an outer tube disposed around the inner tube, and emits UV light by generating a discharge between electrodes provided on an inner peripheral surface of the inner tube and an outer peripheral surface of the outer tube;
the inflow pipe is arranged to allow sample water to flow into the inner tube from one end;
the outflow pipe is arranged to allow the sample water oxidized by being irradiated with UV light in the inner tube to flow out from the other end of the inner tube;
the water quality measurement device further comprises a liquid feed controller that is arranged to repeat an operation of allowing sample water to flow into the inner tube from the inflow pipe, irradiating the sample water in the inner tube with UV light by the excimer lamp with the inflow of sample water stopped to oxidize the sample water, and resuming the inflow of sample water into the inner tube from the inflow pipe to send the oxidized sample water to the detector through the outflow pipe;
the liquid feed controller is arranged to stop the operation of the excimer lamp after sample water in the inner tube has been irradiated with UV light by the excimer lamp and to start the operation of the excimer lamp after the sample water irradiated with the UV light has exited the inner tube; and
the heat dissipation portion dissipates the heat of sample water that has been oxidized by being irradiated with UV light and that flows out of the inner tube into the outflow pipe, allowing the dissipated sample water to flow into the detector.

2. The water quality measurement device according to claim 1 , wherein the detector detects the degradation product by measuring conductivity of the sample water that has flowed into the outflow pipe.

3. The water quality measurement device according to claim 1 , wherein the excimer lamp includes a shielding portion that covers an outer peripheral surface of the outer tube and prevents UV light from leaking to the outside.

4. The water quality measurement device according to claim 3 , wherein a reflecting surface that reflects UV light is formed on an inner surface of the shielding portion.

5. The water quality measurement device according to claim 3 , wherein a fluorescent agent is applied to an inner surface of the shielding portion.

6. A water quality measurement method comprising:
an inflow step of allowing sample water to flow, through an inflow pipe, into a passage region of a UV light irradiation portion that has the passage region through which sample water passes and irradiates the sample water with UV light from around the passage region;
an irradiation step of irradiating the sample water in the passage region with UV light by the UV light irradiation portion;
an outflow step of allowing the sample water, which has been oxidized by being irradiated with UV light by the UV light irradiation portion, to flow into an outflow pipe from the passage region, the outflow pipe being located downstream of the passage region;
a heat dissipation step of dissipating heat of the sample water at a location at a heat dissipation region of the outflow pipe, downstream from the passage region, and
a detection step of detecting a degradation product that has flowed into the outflow pipe by a detector, the detector being located downstream of the heat dissipation region of the outflow pipe, wherein:
in the inflow step, sample water is allowed to flow, through the inflow pipe, from a first end into an inner tube of a twin tube excimer lamp that has the inner tube in which an internal space is formed as the passage region and an outer tube disposed around the inner tube, and emits UV light by generating a discharge between electrodes provided on an inner peripheral surface of the inner tube and an outer peripheral surface of the outer tube;
in the irradiation step, the sample water in the inner tube is irradiated with UV light by the excimer lamp;
in the outflow step, the sample water oxidized by being irradiated with UV light in the inner tube is allowed to flow into the outflow pipe from the othera second end of the inner tube opposite the first end;
an operation of allowing sample water to flow into the inner tube from the inflow pipe, irradiating the sample water in the inner tube with UV light by the excimer lamp with the inflow of sample water stopped, and resuming the inflow of sample water into the inner tube from the inflow pipe to send the oxidized sample water to the detector through the outflow pipe is repeated;
stopping the excimer lamp from operating after the sample water in the inner tube i-s-has been irradiated with UV light by the excimer lamp, and starting the operation of the excimer lamp after the sample water irradiated with the UV light has exited the inner tube; and
allowing sample water that has been oxidized by being irradiated with UV light, that has been heat-dissipated, and that flows out of the inner tube into the outflow pipe to flow to the detector.

7. The water quality measurement method according to claim 6 , wherein, in the detection step, the degradation product is detected by measuring conductivity of the sample water that has flowed into the outflow pipe.

8. The water quality measurement device according to claim 1 , wherein the liquid feed controller is arranged to stop the operation of the excimer lamp when a predetermined time elapses after starting the operation of the excimer lamp.

9. The water quality measurement method according to claim 6 , wherein the operation of the excimer lamp is stopped when a predetermined time elapses after starting the operation of the excimer lamp.

Assignees

• Shimadzu Corp

Inventors

• Yahata Masahito
• Masuda Yuichi
• Kataoka Tatsuya

Classifications

• C02F1/325 Primary

  Irradiation devices or lamp constructions · CPC title

• C02F1/72

  by oxidation {(C02F1/4672 takes precedence)} · CPC title

• G01N27/06

  of a liquid (involving electrolysis G01N27/26) · CPC title

• G01N33/1846

  Total carbon analysis · CPC title

• C02F2201/322

  Lamp arrangement · CPC title