Ballast water treatment device

Patent metadata

Field	Value
Publication number	US-9475566-B2
Application number	US-201314388170-A
Country	US
Kind code	B2
Filing date	Nov 7, 2013
Priority date	Nov 12, 2012
Publication date	Oct 25, 2016
Grant date	Oct 25, 2016

Abstract

A ballast water treatment device includes a ballast water treatment line, a pump for drawing and pressure feeding treatment target water, a filter, an ultraviolet reactor for irradiating filtrated treatment target water with ultraviolet, a ballast tank for storing treated water having been treated with ultraviolet, and an outboard discharger, and the pump, the filter, the ultraviolet reactor, the ballast tank, and the outboard discharger are provided on the ballast water treatment line. Treatment target water drawn for a predetermined period from start of drawing treatment target water is not caused to pass through the filter and the ultraviolet reactor but is discharged outboard by the outboard discharger, and discharging outboard by the outboard discharger is stopped at elapse of the predetermined period and treated water having been filtrated by the filter and having been treated with ultraviolet by the ultraviolet reactor is poured into the ballast tank.

First claim

The invention claimed is:

1. A ballast water treatment device for filtrating water to be treated, irradiating the filtrated water with ultraviolet rays, and storing the treated water having been irradiated with the ultraviolet rays in a ballast tank, the device comprising:
a ballast water treatment line;
a pump for drawing and pressure feeding the water to be treated;
a filter for filtrating the water to be treated;
an ultraviolet reactor for irradiating the filtrated water with ultraviolet rays;
a ballast tank for storing the treated water having been irradiated by the ultraviolet reactor;
an outboard discharger;
a water pouring unit; and
a controller;
wherein the pump, the filter, the ultraviolet reactor, the ballast tank, and the outboard discharger are provided at the ballast water treatment line; and
wherein the controller controls:
counting of an elapsed time after a start of drawing the water to be treated;
the outboard discharger to discharge the water to be treated until the counted elapsed time exceeds a predetermined period of time; and
the water pouring unit to allow the water to be treated to pass through the filter and the ultraviolet reactor when the counted elapsed time exceeds the predetermined period of time, such that the treated water having been filtrated by the filter and having been treated by the ultraviolet reactor pours into the ballast tank, and
wherein the predetermined period of time is a data stored in advance in the controller and accessed by the controller, the data being representative of an amount of time during which turbidity of the water to be treated which has temporarily increased from a start of drawing the water by the pump decreases substantially to a level of the start.

2. The ballast water treatment device according to claim 1 , further comprising:
an ultraviolet irradiation sensor for detecting ultraviolet illuminance in the ultraviolet reactor;
a bypass line which is connected to the ballast water treatment line configured to allow the water to be treated to bypass the filter and ultraviolet reactor;
a filter exit unit disposed at the ballast water treatment line between the filter and the ultraviolet reactor;
a ballast water pouring unit disposed at the ballast water treatment line between the ultraviolet reactor and the ballast tank; and
a bypass unit disposed at the bypass line,
wherein the controller controls:
the bypass unit to cause the water to be treated to pass through the bypass line for the predetermined period of time from the start of drawing the water to be treated, the bypass unit to close the bypass line after elapse of the predetermined period of time;
the water pouring unit and the filter exit unit to pass the water to be treated through the filter and the ultraviolet reactor subsequent to closing of the bypass line;
the ultraviolet reactor to start treating the water to be treated passing through the ultraviolet reactor and to regulate the ultraviolet illuminance;
the outboard discharger to stop discharging the treated water having passed the ultraviolet reactor outboard when the ultraviolet illuminance detected by the ultraviolet irradiation sensor subsequently reaches a predetermined level; and
the ballast water pouring unit to pour the treated water into the ballast tank.

3. The ballast water treatment device according to claim 2 , further comprising: a flowmeter located downstream of the ultraviolet reactor, for detecting a flow rate; wherein the controller controls the water pouring unit and the filter exit unit to start treating the water to be treated passing through the ultraviolet reactor with ultraviolet rays when the flow rate detected by the flowmeter reaches a predetermined level.

4. The ballast water treatment device according to claim 1 , further comprising:
an ultraviolet irradiation sensor for detecting ultraviolet illuminance in the ultraviolet reactor;
a bypass line which is connected to the ballast water treatment line configured to allow the water to be treated to bypass the filter and ultraviolet reactor;
a filter exit unit disposed at the ballast water treatment line between the filter and the ultraviolet reactor;
a ballast water pouring unit disposed at the ballast water treatment line between the ultraviolet reactor and the ballast tank; and
a bypass unit disposed at the bypass line,
wherein the controller controls:
the bypass unit to cause the water to be treated to pass through the bypass line for the predetermined period of time from the start of drawing the water to be treated;
the water pouring unit and the filter exit unit to pass the water to be treated through the filter and the ultraviolet reactor after elapse of the predetermined period, while the bypass line continues to be open;
the bypass unit to close the bypass line;
the ultraviolet reactor to start treating the water to be treated passing through the ultraviolet reactor with ultraviolet rays, and to regulate the ultraviolet illuminance;
the outboard discharger to stop discharging the treated water having passed the ultraviolet reactor outboard when the ultraviolet illuminance detected by the ultraviolet irradiation sensor subsequently reaches a predetermined level; and
the ballast water pouring unit to pour the treated water into the ballast tank.

5. The ballast water treatment device according to claim 4 , further comprising: a flowmeter located downstream of the ultraviolet reactor, for detecting a flow rate; wherein the controller controls the water pouring unit and the filter exit unit to start treating the water to be treated passing through the ultraviolet reactor with ultraviolet rays when the flow rate detected by the flowmeter reaches a predetermined level.

Assignees

• Miura Kogyo Kk

Inventors

• Tange Tomoaki
• Kawakami Akinori

Classifications

• C02F1/325

  Irradiation devices or lamp constructions · CPC title

• C02F2301/043

  Treatment of partial or bypass streams · CPC title

• C02F2303/04

  Disinfection · CPC title

• C02F2209/44

  Time · CPC title

• C02F2103/008

  Originating from marine vessels, ships and boats, e.g. bilge water or ballast water · CPC title