the IHS Ballast Water Guide - RWO Marine Water Technology

IHS Fairplay Solutions Guide to Ballast Water Treatment Systems Sponsored by
is controlled by remote automated control
system of valves, which can permit the tanks
to be treated sequentially or all at once.
Sensors detect the amount of dissolved
oxygen in the ballast water and the pH level
of each tank, and relay the information to a
central control station.
This inert gas has all the ingredients
necessary to combine the two treatments of
hypoxia and carbonation at what is claimed as
a very reasonable cost, as analysis has shown
that given the flow rates and control time for
hypoxia carbonated conditions, the gas needs
only a short contact time to be effective.
Fine Ballast
Mitsui Engineering/MOL/
MOL Marine Consulting
The system employs the synergistic effect of
chemical treatment by the oxidation power
of the active ingredient ozone and physical
treatment using a specially designed pipe
placed in the ballast water piping lines.
The organisms are killed off once only, at
the time the ballast water tanks are filled.
The system extracts the required amount
of ozone from the air. As the right amount
is produced, MOL maintains there is no
requirement for a chemical agent for ozone
supply or storage.
Micro bubbles of ozone are injected into
the system, which achieves high efficiency
levels for absorption and contact against the
plankton and bacteria. Harmful substances
remaining in ballast water are extracted by
activated charcoal, which has no impact on
the environment.
The system was audited according to G8
guidelines. Certification involved a full-scale
land-based test of the system carried out by
Mitsui Engineering & Shipbuilding and other
participant companies together with an
8
onboard test on the MOL-operated container
vessel MOL Express.
The system acquired the final approval under
G9 guidelines at the end of September ptembe be ber 2010 20 2010. 10 10.
VOS
NEI Treatment Systems
6 5
Venturi oxygen stripping (VOS) methodology
and an inert gas generator (IGG) are employed
in NEI’s system. The very-low-oxygen inert
gas is educed into unfiltered influent ballast by
means of venturi injectors.
When exposed to the low-oxygen gas,
dissolved oxygen in the ballast water is
stripped out of solution, leaving the ballast
water deoxygenated and effectively sterilised.
When deballasting, ballast tanks are filled
with inert gas to maintain them as a lowoxygen
environment. This actively reduces
corrosion and coating breakdown in the
ballast tanks.
The VOS system can be installed aboard any
type of vessel. For a 1,000m 3 /h system, the
system has a footprint of approximately 4m 2 ,
while a 4,500m 3 /h system has a footprint
of approximately 10m 2 . It does not require
filters or chemical addition and can handle
very large flow rates without large power
usage –