Ballast water treatment system

A ballast water treatment system, comprising:

• a ballast water supply unit for supplying seawater employed as ballast water to a ballast water tank;
• an electrolysis device receiving a part of the seawater being supplied to the ballast water tank, and generating sodium hypochlorite and hydrogen gas as by-product gas by electrolyzing the part of the seawater being supplied to the ballast water tank via the ballast water supply unit;
• a hydrogen gas removing device receiving a gas-liquid mixture of electrolyzed water and the hydrogen gas that are generated in the electrolysis device, removing the hydrogen gas by a catalyst reaction, and supplying remaining electrolyzed water to the ballast water tank via the ballast water supply unit;
• a heat exchange device increasing a temperature of the seawater by heat exchange with a heat of reaction generated during the catalyst reaction in the hydrogen gas removing device, prior to supplying the seawater to the electrolysis device;
• and
• at least one valve to adjust an amount of the seawater that flows through the heat exchange device,
• wherein the hydrogen gas removing device includes a catalytic reaction tank which comprises:
• a body;
• a hydrophobic dividing plate that divides an inside of the body into a catalyst receiving part through which ambient air flows and an electrolyzed water receiving part through which the gas-liquid mixture flows;
• and
• a hydrophobic catalyst disposed in the catalyst receiving part and generating water by the catalytic reaction of the hydrogen gas.