Page 43: of Maritime Reporter Magazine (February 2013)

Cruise & Passenger Vessel

Read this page in Pdf, Flash or Html5 edition of February 2013 Maritime Reporter Magazine 43PureBallast was among the Þ rst ballast water treatment systems to receive Bal-last Water Type Approval. Operating un- der real-life conditions since 2003, Pure-Ballast provides ballast water treatment that is 100% chemical-free, in contrast to ?chemical-free? systems that produce chemicals during the treatment process. The process is based on a patented form of advanced oxidation technology (AOT), developed in cooperation with Wallenius Water. Treatment occurs in a closed chamber known as a Wallenius AOT unit, in which radicals are gener- ated. These radicals are potent yet ex- ist for only a few milliseconds, which means they neutralize microorganisms but are incapable of leaving the treat-ment system. A 40 m mesh Þ lter is used during ballasting operations. This blocks the intake of larger organisms, but also reduces the amount of sediment in the ballast water tanks. The number of AOT units is determined by the system?s ß ow rate, with individual units handling a ß ow of 250 cu. m./hr.. The performance of the AOT units is safeguarded by an automatic Cleaning-in-Place (CIP) sys-tem, which circulates a biodegradable solution to prevent seawater scaling within the AOT units. This solution is reusable and is replaced once annually when its pH level becomes too high. The automatic cleaning cycle occurs after each operation. The Þ lter is also rinsed once ballasting is completed. A ß ow meter regulates the certiÞ ed ß ow rate and records the volume of ballast that been treated. The water then continues through the AOT units, which treat the water to IMO established limits before it enters the ballast water tanks. The de-ballasting process is the same as bal-lasting, but bypasses the Þ lter system (which is cleaned via automatic back-ß ushing). Outgoing ballast water passes through the Wallenius AOT units to eliminate any re-growth of microorgan- isms that may have occurred. A single PureBallast system can handle ß ow rates of 250-3000 cu. m./hr.. If more capacity is required, even higher ß ow rates can be achieved by installing multiple systems in parallel. Container vessels, RoRo and PC/TCx account for about 1/3 of all units sold. For Alfa Laval, the 250 to 2,000 cu. m./hr. sector is strongest target market. Wärtsilä Wärtsilä said its AQUARIUS UV Ballast Water Management System (BWMS) was granted Type Ap- proval in accordance with require-ments of the 2004 IMO Convention for the control and management of ships ballast water and sediments. AQUARIUS UV BWMS is report- edly the Þ rst system to have been fully endorsed and type approved by the Flag Administration of the Netherlands and is the result of a focused devel- opment program which commenced in 2010. The AQUARIUS range became part of the Wärtsilä portfolio with the acquisition of Hamworthy plc in Janu- ary 2012. AQUARIUS UV BWMS is based on a two-stage treatment process. Upon uptake, seawater is Þ rst passed through a back washing screen type Þ lter. The Þ ltered seawater then passes through a UV chamber where ultra-violet light is used to disinfect the water before entering the ballast tank. On discharge, wa- ter from the ballast tank is pumped through the UV chamber for a second time to complete the disinfection process prior to discharge. The Þ lter is not used during discharge. Working in partnership with the Netherlands? Flag Adminis- tration, independent testing facilities and Lloyds Register, Wärtsilä tested and optimized the AQUARIUS UV BWMS during both land based and shipboard trials conducted in accordance with IMO requirements. Land based tests were conducted at the NIOZ (Royal Netherlands Institute for Sea Research) test fa-cility and ship trials onboard the ?MV TWISTER?, an LPG carrier owned by Chemgas BV. The process is based on a patented form of advanced oxidation technology (AOT).Alfa Laval PureBallast MR #2 (42-49).indd 43MR #2 (42-49).indd 432/4/2013 11:32:25 AM2/4/2013 11:32:25 AM

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