News
Oily water separators The emulsion breaking step of the CD Pre-T uses
Marinfloc offers
forced flotation together with a flocculent. After this
step the cleaned bilge water with less then 15ppm of
pre-treatment
oil is lead back through a three-way valve into the
present OWS suction line and is pumped overboard
system
through the existing OWS and controlled by the
present oil content meter.
Marinfloc AB of Sweden has offered a pre-treatment Alternatively, the CD Pre-T discharges the cleaned
system to solve current cost issues with oily water bilge water into a separate tank, from which the
separator replacements. Ever since 2005, when the present OWS can take its suction.
MEPC 60(33) regulation was replaced by MEPC The first two systems to be launched by Marinfloc
107(49), the older gravity-type oily water separators have a capacity of 1000litres/hour, measuring 1.5m by
(OWS) often had to be replaced by a centrifugal- 0.7m, and 250litres/hour, measuring 0.8m by 1.2m.
type or an emulsion breaking cleaning system or, A larger 2000litres/hour system is to be launched
alternatively, the shipowner chose to compliment within shortly.
the existing OWS with additional filters. Many new
separators sold today also act by using exchangeable New venture
filter cartridges.
Marinfloc has addressed the problem of costly
DESMI joint
replacements of oily water separators by launching a
venture pays off
new pre-treatment system called CD pre-T. Annual
costs of changing filters of OWS can be well above DESMI Ocean Guard AS is the newly established
US$50,000 per year. By keeping the existing certified company dedicated to development, production
OWS, and connecting the CD pre-T in line with and sale of ballast water treatment systems as per
the same, filter changes are said to become virtually International Maritime Organization (IMO) ballast
unnecessary. With the Marinfloc CD pre-T breaking water resolution and the expected US legislation
the emulsion and cleaning the water down to 15ppm, within ballast water treatment has also been taken
the present OWS would just act as a pump, discharg- into consideration.
ing clean water overboard. The company is a joint venture between AP Møller
Since the new CD pre-T is to be installed before – Maersk AS, Skjolstrop & Gronborg ApS and DESMI
any existing OWS, independent of type or make, AS as a result of a approximately one-year intensive
no changes or new certificates are necessary and investigation into finding the optimum ballast water
the investment cost for the pre-treatment system is treatment systems taking efficiency, power consump-
easily balanced against filter costs and the hassle and tion, Capex/Opex, footprint, simplicity and safety
time it takes to change them. Marinfloc claims the into consideration. As the test results were promis-
payback time is less than one year for many ships ing it was decided to form a company responsible for
with challenging bilge water. developing the treatment system. The organisation
today comprises two persons as well as experts from
the three parent companies.
So far it is expected that the basic approval will be
granted at the MEPC 60 meeting during March and
the land-based test is expected to start in mid-2010 at
the new test facility in Denmark under the responsi-
bility of DHI (formerly known as Danish Hydraulic
Institute) and with Lloyd’s Register as supervisor.
The technique used is a combination of
low-pressure ultraviolet (UV) radiation where it is
utilised that low-pressure UV lamps is generating
ozone. Prior to the actual treatment step DESMI
Ocean Guard can offer two different filtration modes;
the conventional pressurized filtration system with
a 40μm fineness as well as a unique pressure less
concept going down to 10μm fineness.
The ozone is guided into the ballast water stream
CD pre-T pre-treatment system from Marinfloc (Credit:
in order to react with the organic material in the ballast
Marinfloc AB).
water. In case any ozone should be left in the ballast
8 Ship & Boat International March/April 2010
SBI_MarApr10_p8-9-10-12.indd 8 26/02/2010 12:20:03
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