PROBLEM TO BE SOLVED: To provide a ballast water treatment method capable of suppressing or preventing the occurrence of factors inhibiting normal execution of ballast water treatment using an aqueous solution of a chlorine-based chemical as a sterilizer.SOLUTION: A ballast water treatment method for sterilizing ballast water stored in a ballast tank of a ship includes: a sterilizer preparation step of preparing a chlorine-based sterilizer ms for ballast water sterilization; a sterilization treatment step of sterilizing the ballast water by injecting the sterilizer through a sterilizer piping route Ls to seawater flowing through at least a part of pipe in the piping route Ls allowing seawater, taken from the outside of a ship by a ballast pump, to flow into the ship; a residual matter removal step of injecting at least a part of a residual sterilizer Re, remaining in the sterilizer piping route without being used for the sterilization, into the pipe to remove it to the outside of the sterilizer piping route; and a reduction treatment step of reducing free available chlorine derived from the sterilizer remaining in the ballast water. The removal step is performed before the reduction treatment step.SELECTED DRAWING: Figure 8
【課題】塩素系薬剤の水溶液を殺菌剤として使用するバラスト水処理の正常な実行の阻害要因の発生を抑制又は防止できるバラスト水処理方法を提供することである。【解決手段】船舶のバラストタンクに収容されるバラスト水を船舶内で殺菌するバラスト水処理方法が、バラスト水殺菌用の塩素系殺菌剤msを用意する殺菌剤準備工程、バラストポンプにより船舶外から取水された海水を船舶内に流す配管経路Lsの少なくとも一部である配管内を流れる海水に前記殺菌剤を殺菌剤配管経路を介し注入し前記バラスト水を殺菌する殺菌処理工程、前記殺菌に用いられず前記殺菌剤配管経路に残った殺菌剤残留物Reの少なくとも一部を前記配管内に注入し前記殺菌剤配管経路外に除外する残留物除去工程、前記バラスト水中の残留殺菌剤由来の遊離有効塩素を還元する還元処理工程、を備え、前記除去工程が前記還元処理工程の前に実行される。【選択図】 図8
BALLAST WATER TREATMENT METHOD
バラスト水処理方法
2017-10-05
Patent
Elektronische Ressource
Japanisch
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