Feature 1
Another firm which is preparing for the MBR240 Mk III type plants on Eurodam,
enforcement of MEPC 159(55) is Hamworthy being built by Fincantieri on behalf of
Water Systems. Its Membrane BioReactor Holland America Line. Commissioning
(MBR) meets the IMO regulations and also and handover will be during the summer
satisfies Alaskan standard 33CFR159.309. of 2008.
The MBRs utilise a combination of
biological treatment and side stream Victorian excellence
crossflow membrane technology. A 3m/s Cunard Line’s cruiseship Queen Victoria
crossflow is maintained to eliminate blockage has also had two MBR320 Mk III units
and to keep the membrane surface clean for installed, each capable of processing up to
good permeate production. 320m
3
/day of black and grey water. Crew
The system uses no chemicals for the training and plant familiarisation was
main process, and the membrane modules undertaken during the maiden voyage on
are readily accessible and may be easily and 11 December 2007 with a full complement
quickly cleaned in place. Side stream, low- of 3000 passengers and crew.
pressure tubular membranes can achieve The MBR project for this vessel was
much higher flux rates than submerged unusual because of the ship’s construction
membrane systems, resulting in a smaller schedule, said Allan Bentley, managing
membrane area and allowing independent director, Hamworthy. When Fincantieri
location of the membranes from the process received the newbuilding order, the
tank. shipyard had a slot available to build one
Hamworthy’s ongoing product module, which was then ‘mothballed’ for
development over the last six years has a year until work started on the rest of
produced the Mk II and Mk III MRB the ship. ‘Half of the MBR’s main process
the mezzanine deck of the hamworthy
systems, which are reckoned to have tank is located in that module,’ Mr Bentley
MBr AIDAdiva installation, showing the
achieved around a 20% to 25% saving on said. ‘About two years elapsed between
membranes below and the main control
energy consumption and a greater saving delivering the first part of the plant and
panels above.
on operational man-hours. MBR has so far commissioning the complete system once
been fitted to 17 cruiseships, comprising the other half had been installed in the
both retrofits and newbuildings. adjacent ship section.’ large cruiseships. One is “full treatment”, ie
During 2007, Hamworthy completed The MBR was not the only water system to treat all the wastewater, including black
AIDAdiva’s system installation at Meyer Hamworthy supplied for Queen Victoria. water, accommodation grey water, laundry
Werft, encompassing two MBR600 Mk Three Serck Como multi-stage flash (MSF) water, galley water, and in particular waste
III units treating black water and all evaporators were also fitted, producing food water. This incurs a greater amount
grey waters, including waste food water. fresh water for the cruiseship. Two of the of residuals generated from the wastewater
The plants are equipped with a satellite MSF evaporators have a capacity of 650m
3
/ treatment processes, which often requires
communication system to facilitate day and the other produces 400m
3
/day. the residuals to be dewatered, dried, and
technical support and service. For the MSF evaporator, steam, engine incinerated onboard where permitted.
In addition to three repeat shipsets jacket water, or a combination of the two ‘The other configuration is “partial
for Aida Cruises, Hamworthy is can be used for heating. Seawater is first treatment” ie to treat all black water and partial
supplying two MBR 140s to T Mariotti pumped through a cascade of condensers grey water. This configuration also satisfies
for each of the 450-passenger ultra- for heat recovery, and then a heat regulatory requirements and environmental
luxury cruise vessels for The Yachts of exchanger. compliance by balancing the wastewater
Seabourn. Working in partnership with After heating to a specific temperature, treatment capacity and ship holding capacity
the builder, Hamworthy designed the which is typically 80°C, all energy required according to the ship itinerary.
process tanks for local manufacture, and for evaporation is stored in this stream of ‘With this configuration, there are much
the modular design of the associated hot seawater. Once this has been injected less residuals from the treatment processes,
equipment endows flexibility to the plant into stage one, evaporation takes place and therefore they can be managed
configuration. through stepped pressure and temperature without the additional resources and the
The Mk II variants of the MBR supplied drops in the flash evaporation stages, environmental concerns associated with
to Seabourn will treat all black and grey without further heat transfer. the thermal drying and destruction of the
water onboard the ships. The equipment Wei Chen, research and development solid wastes. The MBR systems for a “partial
for the first of the vessels, Seabourn manager, Hamworthy, commented: ‘There treatment” configuration are also smaller
Odyssey, was delivered in December 2007 have been two distinctive operational due to reduced capacity requirement.
for installation during 2008. requirements and system configurations in Hamworthy has MBR systems serving both
Hamworthy engineers are also fitting two terms of black and grey water treatment on configurations.’ NA
The Naval Architect February 2008 35
NA Feb 08 - p34+35.indd 35 05/02/2008 09:35:40
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