Type Approved to IMO MEPC 227 (64)
without nitrification (BOD5 without nitrification) of the samples of effluent taken during the test period does not exceed 25 Qi/Qe mg/l and the chemical oxygen demand (COD) does not exceed 125 Qi/Qe mg/l. “Te test method standard should be ISO 5815 1:2003 for
BOD5 without nitrification and ISO 15705:2002 for COD, or other internationally accepted equivalent test standards.” According to ACO Marine MD Mark Beavis, which along
with a number of other manufacturers, including, RWO, Scanship, Wärtsilä Hamworthy and Selmar’s Blue Sea technology among others,
is in a position to offer an approved waste water
treatment system: “Currently the Baltic Sea is the only IMO designated Special Area, but other areas are applying for special area status and so there would potentially be a wider impact on passenger ship operations. Owners and yards really do need to start specifying plant now if they are to comply with the new rules in time.” Te IMO says for the purpose of regulation 9.2.1 of MARPOL
Annex IV, a sewage treatment plant installed on a passenger ship that intends to discharge sewage effluent in special areas should additionally meet the nitrogen and phosphorus removal standard when tested for its Certificate of Type. Te geometric mean of the total nitrogen and phosphorus
content of the samples of effluent taken during the test period should not exceed:
CLARIMAR MF
• Total nitrogen: 20 Qi/Qe mg/l or at least a 70% reduction • Total phosphorus: 1.0 Qi/Qe mg/l or at least an 80% reduction.
The method of testing should meet either the ISO 29441:2010 standard for nitrogen and the ISO 6878:2004 standard for phosphorus or other internationally accepted equivalent test standards. According to Lloyd’s Register MEPC 67 reviewed the nitrogen
and phosphorus removal standards in the 2012 Guidelines on the implementation of effluent standards and performance tests for sewage treatment plants and the conclusion was that, “While there was concern about [the] availability of treatment systems meeting the MEPC.227(64) requirements, the majority view reflected a high degree of confidence that such treatment systems will be available. Subsequently, MEPC 67 decided not to revise (lower) the nitrogen and phosphorus removal standard given in paragraph 4.2.1 of the resolution.” NA
Testing formula: Te overall percentage reduction over the entire test period n is:
ACO Marine's new Clarimar MF advanced black and grey wastewater treatment system is the merchant shipping industry's most effective solution for meeting IMO MEPC 227(64) rules, which entered into force in January 2016.
Small and economical with the lowest running costs of any sewage treatment plant, the Clarimar MF range incorporates the ACO patented ‘Bio-Sword’ technology.
Priceless
Mark Beavis - Managing Director Nádražni 72, CZ -15000 Praha 5, Czech Republic Tel: +420 257 217 990 Fax: +420 257 310 718 Email:
mbeavis@acomarine.com
where: n represents the test day number; and s represents the sample number collected on test day n
The Naval Architect March 2016 37
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