Abstract
This chapter presents the effect of hydroxyl radicals on the photosynthesis pigments of phytoplankton in the experimental system of 20t/h for the treatment of ship's ballast water. Hydroxyl radical has strong oxidizing and decoloring effects on phytoplankton (mono-cell algae), which makes the phytoplankton lose its activity and finally results in all mono-cell algae to be killed. With the dissolved OH concentration of 0.68mg/L, the kill efficiencies of bacteria, mono-algae, protozoan reach 100% within 2.67s in the main pipe of ship's ballast water. The results indicate that the contents of chlorophyl-a, chlorophyl-b, chlorophyl-c, and carotenoid are decreased to 35∼64% within 8.0s further to the lowest limit of test after five minutes. The attenuation efficiencies of photosynthesis pigment are 100%. Therefore, the invasive marine species can be killed in the process of the inputting and discharge of ship's ballast water. A physics method is studied, in which the electrons are accelerated resulting in the excitation, dissociation, or ionization of gas molecules by strong ionization discharge.
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