Abstract: A tubular ozone generator comprises concentric inner tubular electrode/dielectric with inner electrode in intimate length-to-length contact with dielectric and outer tubular electrode with corona discharge zone between the inner tubular electrode/dielectric and outer tubular electrode. A dielectric of the inner tubular electrode/dielectric has a sealed end and an open end. The outer tubular electrode has an open exhaust end concentric with the sealed end of the dielectric and a closed end that forms a port with the open end of the dielectric. A tubular gas injector is situated within and concentric with the inner tubular electrode/dielectric and in conductive electrical contact with an electrode portion of the inner tubular electrode/dielectric. The sealed end of the dielectric is sealed with a transparent end cap to permit visual inspection of an electrode of the electrode/dielectric during operation of the generator.

Abstract: Ozone is generated by injecting a flow of oxygen or oxygen enriched air into a corona discharge zone formed between concentric inner tubular electrode/dielectric and outer tubular electrode. The dielectric of the tubular electrode/dielectric has a sealed end. The feed stream of oxygen or oxygen enriched air is injected by a tubular gas injector having an inlet end to accept the oxygen or oxygen enriched air and outlet end to inject the oxygen or oxygen enriched air within the inner concentric electrode/dielectric in proximity to the sealed end to flow the length of the inner concentric electrode/dielectric to the corona discharge zone for conversion of oxygen to ozone.

Abstract: A treatment provides an effective, safe; and economical method to render ballast water free of contaminating organisms. A ballast water treatment system includes a source of ozone and a ballast tank connected to the source of ozone. In a method of controlling organisms in ballast water of a sea faring vessel, the ballast water is treated with ozone while the vessel is in transit between ports.