The present invention relates to gaseous discharge and applied
biotechnology. In particularly, the present invention relates to a method
for killing organisms in the course of conveying ballast water in ship,
comprising applying a voltage with frequency of 400-40000 Hz between the
anode electrode and the cathode electrode of the free radical generator,
thereby forming strong ionization discharge of electric field strength of
250-600 Td between the anode electrode and the cathode electrode,
ionizing, dissociating, and exciting O.sub.2 and H.sub.2O, or O.sub.2,
processing into active particles comprising O.sub.3, OH. and HO.sub.2,
dissolving excitedly to obtain free radical solution mainly consisted of
OH, adding the free radical solution to conveying pipeline of ballast
water, conveying for 2-20 s in the pipeline, thereby killing organisms of
ballast water selected from the group consisted of bacteria, single cell
alga, and protozoan.