Abstract
This chapter presents a pilot-scale experiment of 20t/h for the treatment of ship's ballast water for practical application on board. The method for the treatment of red tide using hydroxyl radicals is a kind of advanced oxidation technology (AOT), which is considered as atom economy, zero emission, and zero pollution. When the dissolved OH concentration is 0.63mg/L, the kill efficiencies of bacteria, mono-algae, and protozoan reached 100% within 2.67s. At the same time, the ballast water quality is greatly improved. The decrease rates of COD, nitrite, and ammonium salt are 100%, 98.3%, and 99.5% respectively, and the turbidity is decreased to 50%. Dissolved Oxygen (DO) is increased 77% because of the decomposition of residual OH. With this method, invasive marine species can be killed in ship in the process of the discharge of ballast water. The chapter explains a physics method, in which the electrons are accelerated and then the gas molecules are aroused using a strong ionization discharge.
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