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 />
Systems<br />
Pure<strong>Ballast</strong><br />
Alfa Laval 2 3<br />
One of <strong>the</strong> first systems to gain approval, it<br />
makes use of UV to produce hydroxyl radicals<br />
that destroy cell membranes. Pure<strong>Ballast</strong> is<br />
based on Advanced Oxidation <strong>Technology</strong><br />
(AOT) developed initially by Wallenius.<br />
The UV lamps that are at <strong>the</strong> system’s heart<br />
are housed in modules each containing 24<br />
lamps. The system is scalable by <strong>the</strong> addition of<br />
extra modules as required. Modularity can help<br />
where space is at a premium, as <strong>the</strong> units need<br />
not all be housed in one space.<br />
During ballasting and deballasting, <strong>the</strong> units<br />
create radicals with <strong>the</strong> help of a catalyst and<br />
a light source. These radicals <strong>the</strong>n destroy<br />
<strong>the</strong> cell membrane of micro-organisms. The<br />
radicals, which never leave <strong>the</strong> unit, have a<br />
lifetime of only a few milliseconds and pose no<br />
risk to <strong>the</strong> environment or crew.<br />
During ballasting a 50µm filter removes<br />
larger organisms, leaving only <strong>the</strong> smallest<br />
to be treated. The system also operates when<br />
deballasting as a safety measure to kill any<br />
organisms that may have survived <strong>the</strong> initial<br />
treatment. In deballasting <strong>the</strong> filter unit<br />
is bypassed.<br />
The glass of <strong>the</strong> lamps is flushed using a<br />
fruit-acid based compoun, which removes any<br />
sediment that could affect <strong>the</strong> performance<br />
of <strong>the</strong> unit. The lamps are replaceable, but<br />
<strong>the</strong> system will operate effectively even with<br />
several lamps missing.<br />
Pure<strong>Ballast</strong> precisely logs starts, stops and<br />
o<strong>the</strong>r data in accordance with IMO guidelines.<br />
In this way, <strong>the</strong> system makes it easy to act<br />
in accordance with <strong>the</strong> ship’s ballast water<br />
management plan.<br />
AquaTriComb<br />
Aalborg/Aquaworx 2 2 3<br />
Working in partnership with Aalborg<br />
Industries, of Denmark, Aquaworx from<br />
Munich, Germany, has developed <strong>the</strong><br />
AquaTriComb (ATC) system, which works<br />
on a purely physical basis without employing<br />
or generating chemical substances. It is one<br />
of many systems available that make use of<br />
ultraviolet radiation.<br />
Being a modular system (pre-treatment and<br />
secondary treatment) it lends itself to both<br />
new and retrofit installations. The system<br />
is scaleable and comes in sizes ranging from<br />
250m 3 /h to 4,000m 3 /h. Running two systems<br />
in parallel operation can increase <strong>the</strong> flow rate<br />
to 8,000m 3 /h.<br />
Micro-organisms and sediment are removed<br />
from <strong>the</strong> ballast water during a pre-treatment<br />
phase using filters to guarantee optimal<br />
disinfection during <strong>the</strong> secondary treatment<br />
phase, which is performed using <strong>the</strong> effects of<br />
UV-C radiation and ultrasound.<br />
Ultrasound is used for automatic cleaning of<br />
<strong>the</strong> filter modules and to break down particles<br />
and micro-organisms, <strong>the</strong>reby maximising<br />
<strong>the</strong> efficiency of <strong>the</strong> UV treatment. The use of<br />
ultrasound is said to achieve high and lasting<br />
efficiency in <strong>the</strong> filtration and disinfection<br />
processes. The ultrasound also promises<br />
extremely effective and permanent cleaning<br />
of <strong>the</strong> UV radiators through <strong>the</strong> removal of<br />
biofilms and depositions.<br />
The design of <strong>the</strong> system, which has<br />
easy-to-follow menu controls, ensures that<br />
investment and operation costs, maintenance<br />
and total energy consumption (approximately<br />
13kW at 250m³/h) are kept low.<br />
12 © <strong>IHS</strong> Global Limited 2012<br />
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