the IHS Ballast Water Guide - RWO Marine Water Technology

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