A
system and process for de-halogenating
ballast water before releasing the
ballast water from the vessel. In one embodiment, the
system comprises a means for measuring the
halogen content of the
ballast water, a
reducing agent source in fluid communication with the ballast water, and a means for controlling the amount of
reducing agent supplied to the ballast water. In one aspect, the means for measuring the
halogen content comprises one or more oxidation /
reduction potential analyzers. In another embodiment, the
system comprises one or more
hypochlorite electrolytic cells for generating
hypochlorite to treat the ballast water.One embodiment of the process for de-halogenating ballast water comprises measuring the oxidation /
reduction potential of the ballast water and adding one or more reducing agents to the ballast water to de-halogenate the ballast water in response to the measured oxidation /
reduction potential. In one aspect, the oxidation / reduction potential is modulated so that excess
reducing agent is present in the ballast water.