Method for treating ballast water and device for treating ballast water used therefor

Patent metadata

Field	Value
Publication number	US-10287200-B2
Application number	US-201314438069-A
Country	US
Kind code	B2
Filing date	Oct 24, 2013
Priority date	Oct 25, 2012
Publication date	May 14, 2019
Grant date	May 14, 2019

Abstract

Provided are a novel method and device for treating a liquid that can be utilized for treating ballast water used in ships, etc. The method and device for treating a liquid provided herein allow aquatic organisms contained in a liquid to be sufficiently inactivated or separated by being configured in such a manner as to, in supplying the liquid containing aquatic organisms, carry out at least one of an aquatic organism-inactivating treatment and a physical treatment using a centrifugal force and then store the liquid in a storage means, and in discharging the liquid thus stored, determine whether or not the aquatic organism-inactivating treatment is required, carry out the treatment based on the determination, and carry out the physical treatment using a centrifugal force.

First claim

What is claimed is:

1. A method for treating ballast water from seawater for storage inside a ship, comprising:
supplying a whole amount of seawater taken in from outside a ship to an electrolytic cell,
carrying out an aquatic organism-inactivating treatment by electrolyzing the seawater in the electrolytic cell to produce a chlorine-containing substance,
carrying out a treatment by a liquid cyclone with respect to the seawater that has been subjected to the inactivating treatment so that the chlorine-containing substance is stirred in the seawater and the seawater is separated into a supernatant and a concentrated liquid, and
storing the supernatant in a ballast tank located inside the ship.

2. The method according to claim 1 , wherein a flow velocity of the liquid flowing into the liquid cyclone is 2.5 to 3.3 m/sec.

3. The method according to claim 1 , wherein the concentrated liquid has a higher solid content concentration than that of the supernatant.

4. The method according to claim 1 , wherein the concentrated liquid comprises at least one of aquatic organisms with a shell whose height is at least 50 μm and aquatic organisms with a shell whose aspect ratio (shell length/shell height) is 0.1 to 10.

5. The method according to claim 1 , wherein a concentration of the chlorine-containing substance contained in the liquid in the electrolytic cell is 0.1 mg/L to 20 mg/L.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Yamamoto Hiroshi
• Edagawa Akiyoshi
• Sakakibara Takashi
• Osamura Kazumi
• Nagaoka Hideki
• Kotanagi Takuya
• Funakoshi Hidenori

Classifications

• C02F2209/40

  Liquid flow rate · CPC title

• C02F1/4674

  with halogen or compound of halogens, e.g. chlorine, bromine · CPC title

• C02F1/4606

  for producing oligodynamic substances to disinfect the water · CPC title

• C02F1/66

  by neutralisation; pH adjustment (for degassing C02F1/20; using ion-exchange C02F1/42; for flocculation or precipitation of suspended impurities C02F1/52; for removing dissolved compounds C02F1/58) · CPC title

• B01D21/267

  by using a cyclone · CPC title