Page 51: of Maritime Logistics Professional Magazine (Q4 2012)

The Environment: Stewardship & Compliance

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guidance on the design/installation of sampling ports in ac-cordance with IMO G2 Guidelines.The Hyde GUARDIAN uses a high intensity ultraviolet (UV) treatment as a means of disinfection. The UV chamber is designed for minimum pressure drop, maximum retention time, and compatibility with the marine operating environ- ment. The medium pressure lamps produce a polychromatic output across the entire spectrum of the germicidal curve and have an expected service life of up to 8,000 hours. Reference List Hyde GUARDIAN has now been installed or speciÞ ed on over 160 ships (200+ systems). Commonly in use in the cruise, parcel tanker and container markets, about one-third of those units are in service or commissioned. Delivered to a wide range of ship size and type (60m3 up to 5000m3), Hyde has been speciÞ ed in some smaller research hulls. About 15% of their orders are for retroÞ ts. Caveats The trade-off with this system is the larger Þ lter(s) which provide better performance. This balances the smaller UV footprint. Increase in physical footprint is linear, as the unit in- creases in capacity, up to 1300 m3/hr. Older tankers and larger vessels needing retroÞ tting might cost more. Advantages According to Hyde, their depth Þ ltration method increases removal efÞ ciency and solids holding capacity while main- taining low pressure drop and a high ß ow rate. The Þ lter is unique in its patented, self-cleaning design. When a preset differential pressure is reached, the fully automatic backwash starts by starting a backwash/booster pump. The unitÕs power footprint Ð according to Hyde Ð is reasonable and the absence of chemicals gives a cost advantage. No hydrochlorination (hydrogen build-up) is used, so this could be added to cost of other systems. Also according to Hyde, a non-chemical ballast water treatment technology can help to mitigate many risks associated with Ballast Water Management. ExperienceFounded 1997 to provide environmental compliance servic- es to the major oil and power companies, in 2002, N.E.I. be- gan development of a de-oxygenation ballast water treatment system Ð the Venturi Oxygen Stripping (VOS). In 2007, N.E.I. obtained the worldÕs Þ rst IMO CertiÞ cation-Liberia. How it Works Venturi Oxygen Stripping (VOS) is a physical process, which removes Dissolved Oxygen (DO) from the ballast water during intake only (no retreatment is required during discharge). VOS does not require any Þ ltration or active sub- stances, and does not require changing ballast pumps due to ß ow restrictions. VOS leverages a highly efÞ cient Stripping Gas Generator (similar to an Inert Gas Generator) to produce a very low oxygen gas (Stripping Gas). This gas is introduced to the ballast water via a Venturi Injector (VI). The VI gen- erates extreme cavitation/vacuum in-line, creating a bubble emulsion in the ballast water. Within ~10 seconds, more than 95% of the DO is stripped out of solution, and simply vented to atmosphere. Any species dependent upon oxygen is suffo- cated, treating many controlled species within an hour. How- ever, the oxygen levels are high enough to prohibit anaerobic life. Many organisms are treated during the venturi phase of treatment itself (due to the sheering forces intrinsic to the cav- BALLAST WATER TECHNOLOGY | Maritime Professional | 51MP #4 50-63.indd 51MP #4 50-63.indd 5111/12/2012 11:17:00 AM11/12/2012 11:17:00 AM

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Maritime Logistics Professional magazine is published six times annually.