the IHS Ballast Water Guide - RWO Marine Water Technology

Sponsored by IHS Fairplay Solutions Guide to Ballast Water Treatment Systems
diff erential pressure is reached, or after a
pre-determined time interval. There is no
fl ow interruption during the backfl ushing
and the process takes only a few seconds.
The electrodes used in the EctoSys module
have special chemical and electrochemical
properties that cause the formation of
hydroxyl (OH) radicals. These OH radicals are
highly reactive and react almost as soon as
they are formed. Consequently they are very
short-lived and cause no problem with total
residual oxidant checks.
Diff erent salinities of ballast water
produce diff erent active substances. In
waters of low salinity, the highly reactive
OH radicals are the only active substance
produced, while in brackish or seawater small
volumes of other disinfecting substances
are also produced as by-products, which act
alongside the reactive OH radicals.
In contrast to conventional chlorine
electrolysis the EctoSys, disinfection is
independent of the presence of salts in the
water to produce OH radicals. Furthermore,
the performance of the system is also not
infl uenced by sediments, turbidity or the
colour of the water.
CleanBallast was tested in river water with
TSS counts of much higher concentrations
than the IMO test water requirements. Thus
CleanBallast treats ballast water successfully
under worse than IMO reference conditions.
Its modular construction makes
CleanBallast suitable for both retrofi t and
newbuild installations, although
it can also be supplied as skidmounted
and containerised
versions. Further positive aspects
of the CleanBallast technology
are that it is always available for
immediate operation, is designed
for a long lifetime, does not need
any warm-up time nor does it have a cooling
requirement, being fully automatic, robust and
not aff ected by possible vibrations on board.
The RWO system has also been extensively
tested by independent bodies confi rming
that CleanBallast does not alter the
corrosion behaviour of treated ballast water.
SWEREA KIMAB and Germanischer Lloyd
confi rmed that seawater after treatment with
CleanBallast shows no increase in corrosive
properties for material and coatings, and GL
classifi es CleanBallast as compatible with
epoxy-based ballast tank coating systems.
As of the end of February this year, more
than 35 CleanBallast units had already been
commissioned for successful commercial
operation and sea-trialled in the Shanghai
Delta and Yangtze River – in terms of
water quality probably one of the harshest
environments in the world. CleanBallast
is thus one of the few BWT systems that
can demonstrate substantial experience in
commercial application.
Since February RWO has been off ering
shipowners an additional and essential service
for retrofi ttings. As one of the fi rst ballast
water treatment system manufacturers
worldwide, RWO recently acquired its own
high-speed 360° 3D scanner. RWO can now,
in only a short time, create in exact detail
three-dimensional images of a ship’s engine
room and by this means portray the most
advantageous options for installing the
CleanBallast system.
The CleanBallast system is
one of the very few ballast
water treatment systems
deemed by the California
State Lands Commission
report to have demonstrated
the potential to comply with
the commission’s exacting
performance standards.
This high speed 3D scanner captures exact
© IHS Global Limited 2012
details of the available installation space
45
044_045_BW1204.indd 45 21/03/2012 18:51:06
Photo RWO