A pilot-scale experiment of 20 t/h for the treatment of ship’s ballast water is re-ported in this paper. When the concentration of the dissolved OH· was 0.68 mg/L during theexperiment, the rate of destroying bacteria, mono-algae, protozoan reached 100% within 2.67 s.The effect of hydroxyl radicals on biochemical processes was also studied. The attenuation rateof photosynthesis pigment was 100%. And the main reason for the cells’ death was the strongdestruction of the monose, amylose, protein, DNA and RNA in the cells. As an advanced oxida-tion method, the procedure can destroy invasive marine species when a ship is in the process ofdischarging its ballast water.
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