the IHS Ballast Water Guide - RWO Marine Water Technology
the IHS Ballast Water Guide - RWO Marine Water Technology
the IHS Ballast Water Guide - RWO Marine Water Technology
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<strong>IHS</strong> Fairplay Solutions <strong>Guide</strong> to <strong>Ballast</strong> <strong>Water</strong> Treatment Systems Sponsored by<br />
Treatment system<br />
of choice –<br />
Clean<strong>Ballast</strong><br />
When <strong>RWO</strong> began developing a ballast<br />
water treatment system back in 2003,<br />
<strong>the</strong> clear goals set were to achieve a<br />
system that fulfi lled IMO regulations and<br />
was economical in investment and<br />
operation, but at same time was suitable<br />
to work in real-life conditions and able to<br />
fulfi l future regulations.<br />
Robustness, easy operation and<br />
maintenance, and being suitable<br />
for both newbuildings and<br />
retrofi ttings, were o<strong>the</strong>r points<br />
to be achieved by <strong>the</strong> BWTS.<br />
After several years of<br />
research and development<br />
and comparison of various<br />
sediment removal and<br />
disinfection technologies,<br />
<strong>the</strong> Bremen-based marine<br />
water treatment company<br />
believes it has achieved all <strong>the</strong>se<br />
key criteria with its Clean<strong>Ballast</strong><br />
system. First orders for <strong>the</strong> twostage<br />
Clean<strong>Ballast</strong> system were<br />
received at <strong>the</strong> end of 2007 – to<br />
equip 20 newbuild vessels.<br />
<strong>RWO</strong>’s Clean<strong>Ballast</strong> system consists of a<br />
two-stage process, starting with mechanical<br />
fi ltration by Disk Filters followed by <strong>the</strong><br />
advanced electrochemical disinfection<br />
EctoSys. The fi ltration process is carried out<br />
only during ballast water uptake, whereas<br />
Photo <strong>RWO</strong><br />
The EctoSys module is at<br />
<strong>the</strong> heart of <strong>the</strong> <strong>RWO</strong><br />
Clean<strong>Ballast</strong> system<br />
disinfection is applied both when ballasting<br />
and during ballast discharge. This is to<br />
remove any organisms that ei<strong>the</strong>r are already<br />
present in tanks or that may regrow in <strong>the</strong><br />
ballast tanks during a ship’s voyage.<br />
The modular fi ltration stage, that can be<br />
arranged horizontally, vertically and even<br />
as a stacked system, removes particles that<br />
are >55μm and allows minimal use of active<br />
substances at <strong>the</strong> disinfection stage.<br />
The Clean<strong>Ballast</strong> system ensures<br />
minimum power consumption and is<br />
able to operate eff ectively in all kinds<br />
of water, regardless of its salinity<br />
or turbidity.<br />
An additional, optional feature<br />
of <strong>the</strong> Clean<strong>Ballast</strong> system that<br />
is available is <strong>the</strong> Algae Monitor.<br />
This unit continuously checks<br />
<strong>the</strong> quality of <strong>the</strong> ballast water by<br />
measuring <strong>the</strong> numbers of viable<br />
phytoplankton that are present. It also<br />
fur<strong>the</strong>r minimises <strong>the</strong> already very<br />
low power consumption to<br />
produce disinfectants.<br />
The Disk Filters consist of a<br />
series of individual thin, grooved plastic<br />
discs stacked on to several spines; microorganisms<br />
and particles are caught in<br />
<strong>the</strong> grooves and on <strong>the</strong> outside surface of<br />
<strong>the</strong> discs. Back-fl ushing of <strong>the</strong> fi lters is<br />
automatically triggered when a pre-defi ned<br />
44 © <strong>IHS</strong> Global Limited 2012<br />
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