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 />
substances during ballasting and deballasting.<br />
The system combines filter and UV units,<br />
employs backflushing and is cleaned by<br />
automatic wiping. The filter unit maximises<br />
<strong>the</strong> disinfection effect of <strong>the</strong> UV unit by<br />
improving transmittance of UV light. The<br />
filter not only eliminates organisms larger<br />
than 50µm, but also minimises sediment in<br />
<strong>the</strong> ballast tanks.<br />
<strong>Water</strong> enters through <strong>the</strong> inlet pipe<br />
into <strong>the</strong> filter area and flows through <strong>the</strong><br />
cylindrical filter element from inside out.<br />
The filtration cake accumulating on <strong>the</strong><br />
element surface causes a pressure differential<br />
to develop across <strong>the</strong> filter element. When<br />
this pressure difference reaches a pre-set<br />
value, or after a pre-determined time lapse,<br />
<strong>the</strong> backflushing mechanism kicks in.<br />
Backflushing takes 10–30 seconds. During<br />
<strong>the</strong> backflushing cycle <strong>the</strong> filtered water<br />
is not interrupted and continues to flow<br />
downstream of <strong>the</strong> filter.<br />
Contaminated water is exposed to UV<br />
light. A real-time process control system<br />
activates and deactivates lamps to maintain<br />
<strong>the</strong> UV dosage while conserving power. This<br />
is controlled and monitored by means of a<br />
programmable logic controller (PLC) and<br />
touchscreen.<br />
Sky-System<br />
Peraclean Ocean<br />
The Sky-System ballast water management<br />
system consists of treatment with <strong>the</strong><br />
Peraclean Ocean preparation, which contains<br />
<strong>the</strong> active substances peracetic acid and<br />
hydrogen peroxide, which are stored in<br />
double-walled tanks.<br />
The concentrations of <strong>the</strong> active substances<br />
are monitored and, if necessary, neutralised<br />
with sodium sulphite (Na 2 SO 3 ) and water<br />
before <strong>the</strong> ballast water is discharged. The<br />
5<br />
neutraliser is contained in epoxy-coated tanks.<br />
Temperature and leakage sensors,<br />
temperature control unit, ventilators and<br />
sprinklers in <strong>the</strong> chemical storage room<br />
are used to prevent <strong>the</strong> temperature from<br />
exceeding 35ºC.<br />
During land-based tests using <strong>the</strong><br />
concentration of active substance that is<br />
applied in actual operation, no corrosion was<br />
observed. Corrosive influences were reported<br />
to be acceptable on <strong>the</strong> ballast tank coatings ng<br />
and uncoated materials.<br />
OceanGuard<br />
Qingdao Headway<br />
2 9<br />
OceanGuard has been developed by Headway<br />
<strong>Technology</strong> from Qingdao, toge<strong>the</strong>r with <strong>the</strong><br />
Engineering department of Harbin University<br />
in China.<br />
An Advanced Electrocatalysis Oxidation<br />
Process (AEOP) is used to manage <strong>the</strong><br />
treatment, in which short-lived hydroxyl<br />
radicals are produced. Because of <strong>the</strong>ir highly<br />
reactive efficiency in chained mode and effect<br />
of <strong>the</strong> oxidative breakdown, <strong>the</strong> radicals<br />
perform broad spectrum sterilisation, killing<br />
off <strong>the</strong> various forms of bacteria, virus, algae<br />
and dormant ovum in <strong>the</strong> ballast water. The<br />
organisms are transformed to simpler organic<br />
molecules that are eventually mineralised to<br />
CO 2, H 2O and trace inorganic salt.<br />
OceanGuard has three main components.<br />
The control unit contains <strong>the</strong> procedures for<br />
system operation. It has system diagrams and<br />
sensor displays and is used for monitoring and<br />
regulating data readings and dealing with any<br />
alarm signals.<br />
A fully automatic 50µm backflush filter,<br />
which can accomplish automatic backflush<br />
and filtering at <strong>the</strong> same time, prevents large<br />
organisms from entering <strong>the</strong> ballast tank to<br />
reduce sedimentation.<br />
30 © <strong>IHS</strong> Global Limited 2012<br />
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