Feature 1 | Cruiseship teChnology
Wastewater regs ripple through
Hamworthy and Aker are among those already outfitting cruiseships
with water treatment systems complying with IMO wastewater discharge
regulations that affect new ships built after 2009. Clare Nicholls reports.
N
ew maritime wastewater rules are
being introduced which apply
to ships with keels due to be laid
on or after 1 January 2010 that follow the
IMO jurisdiction. MEPC 159(55), ‘revised
guidelines on implementation of effluent
standards and performance tests for sewage
treatment plants’, specifies that the following
effluent standards should be met for treated
black water:
• Bacteria: 100 faecal coliforms per
100ml
• Total suspended solids: 35milligrams
per litre
• Organic matter measured as biological
oxygen demand (BOD5): 25milligrams
per litre as a mean value
• Organic matter measured as chemical
oxygen demand (COD): 125milligrams
per litre
• A pH level of 5 to 8.5
• No visible floating solids or
discolouration of the surrounding water
of the vessel
IMO does not regulate dumping of
untreated wastewater into the ocean outside
of 12nm from shore, but local regulations
may prohibit such discharges. These local
regulations are in many cases stricter
than the new IMO rules anyway, and
will supersede the new IMO wastewater
discharge standards. The stringent discharge
rules in Alaska, USA, which may become
even stricter in the near future, represent
one such example.
Stricter rules also apply in the rest of the
waters surrounding the USA, where US
Coast Guard (33 CFR 159, USCG MSD the membrane arrangement of the MBr onboard Queen Victoria.
regulation) prevails for US-flagged ships.
Foreign ships with IMO-approved sewage
systems will, however, be exempt from these Purification Plant (AWP) does meet the The plant is said to have proven its reliability
rules. requirements, and has also been designed and satisfied performance criteria, and can
Traditional marine sanitary devices built to meet the rigorous Alaska-Murkowski increase the operational flexibility of a ship,
to the previous Annex IV standard will not standards. opening up new sailing routes, simplifying
meet MEPC 159(55), and may fail to meet Aker’s Scanship AWP system is now onboard water logistics, and ensuring
most MEPC 159(55)-regulated parameters. being installed aboard cruiseships built at compliance with local and international
However, Aker Yards’ Advanced Wastewater the company’s St Nazaire yard in France. regulations.
34 The Naval Architect February 2008
NA Feb 08 - p34+
35.indd 34 05/02/2008 09:35:37
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