BALLAST WATER TREATMENT APPARATUS AND BALLAST WATER TREATMENT METHOD

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PROBLEM TO BE SOLVED : To provide a ballast water treatment method in which the occurrence of inhibitory factors of normal execution of ballast water treatment in which an aqueous solution obtained by dissolving a chlorine-based agent in water is used as a disinfectant, can be suppressed or prevented. SOLUTION : The ballast water treatment method in which a ballast water contained in a ballast tank included in a ship is disinfected inside the ship, includes a disinfectant preparation step for preparing a chlorine-based disinfectant ms in order to carrying out the disinfection of the ballast water contained in the ballast tank, a disinfection treatment step for injecting the chlorine-based disinfectant into the ballast water via a piping route Ldr to disinfect the ballast water, and a residue removal step for removing at least a portion of a residue Re of the chlorine-based disinfectant remaining in the piping route without being used for the disinfection of the ballast water, from the piping route, and in which the residue removal step includes a first step for containing at least a portion of the residue of the chlorine-based disinfectant in a tank Tsm and a second step for discharging at least a portion of the residue of the chlorine-based disinfectant contained in the tank from the tank. SELECTED DRAWING : Figure 9 COPYRIGHT : (C)2017, JPO&INPIT