the IHS Ballast Water Guide - RWO Marine Water Technology

Sponsored by IHS Fairplay Solutions Guide to Ballast Water Treatment Systems
and Trojan Marinex formally launched their
system in October 2010.
The BWT 500i system’s filtration unit and
ultraviolet lamps providing disinfection are
housed in a single 2m3 unit. The system has
a compact design, making it easy to install
and suitable for most vessels. It offers low
maintenance costs and high throughput.
Wärtsilä sees easy installation and a small
profile as crucial for the retrofit market.
The Wärtsilä BWT 500i treats the ballast
water in a two-step process, first by filtering
out larger organisms and particles, and then
by ultraviolet disinfection. The UV irradiation
either kills the remaining organisms, or
renders them incapable of reproduction. Each
unit is capable of treating 500m3 /h, and it is
possible to install several units in parallel for
higher flow rates.
The company highlights some of the
advantages of the system are the low power
consumption, the treatment system does not
use chemicals, and there is no impact on ballast
water treatment corrosion or coatings. oating ng ngs.
BSKY
Wuxi Brightsky Electronic
c 2 3
The BSKY system from Wuxi Brightsky
Electronic of Jiangsu province, China, is
modular in structure and uses what it calls
Enhanced Physical Treatment, which is a
BWTS that employs cyclonic and ultrasonic
pre-filtration combined with UV irradiation.
On ballast intake, water passes through a
hydrocyclone. The ultrasonic pre-filter limits
the intake of organisms and sediment. The
water is treated with UV module, which
destroys the micro-organisms.
During the discharge process, the water is
treated again so as to eliminate any growth
that may have occurred in the ballast tanks.
At this stage the hydrocyclone is bypassed.
The company argues that conventional
filtration systems – those using a 50µm filter
can experience problems with clogging and
often require replacement.
The ultrasonic pre-filter prevents regrowth
and leads to lower power consumption on
ultraviolet treatment.
ARA Ballast
(Blue Ocean Guardian)
21st Century 2 3
Formerly known as the Blue Ocean Guardian
(BOG) system. During ballasting, the filtration
module of the ARA Ballast system removes
aquatic organisms and particles larger than
50µm. Backflushing water, which includes
micro-organisms and particles retained by
automatic backflushing devices, is returned
overboard. After filtration, aquatic organisms
are destroyed by intensive shockwaves
produced by a low-voltage plasma module.
Active substances, such as ozone,
atomic oxygen, nitric oxide and superoxide
radicals are produced during this process.
Then, residual organisms and bacteria are
disinfected by a medium-pressure ultraviolet
(MPUV) module.
The MPUV module uses a wavelength of
UV-C (200–280nm) to generate UV rays
from a mercury-arc lamp. It is available for
automatic cleaning in order to increase the
penetration rate of a quartz tube.
During deballasting, while the filtration
module and the plasma module are bypassed,
the MPUV module disinfects the water again
in the event that micro-organisms and bacteria
regrowth have occurred during the voyage.
Power consumption during a land-based
system treating water at a rate of 120m 3 /h
was estimated to be less than 1kW for
filtration, 20kW for the MPUV module and
less than 10kW for the plasma module.
© IHS Global Limited 2012 37
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