Marine Pollution by sewage [ Marpol annex IV ]
The Master shall prevent marine pollution by complying with “MARPOL Annex IV” and any local or domestic law and regulations.
“Sewage” means:
1. Drainage and other waste from any form of toilet
2. Drainage from medical premises (hospital etc.) via wash basins and scuppers located in such premises
3. Other wastewaters when mixed with the drainage defined above
Prohibition on Sewage Discharge
The discharge of sewage into the sea is prohibited, except when:
• The ship has in operation an approved Sewage Treatment Plant which has been certified by the flag state, and the effluent does not produce visible floating solids in, nor cause discoloration of the surrounding water, OR
• The ship is discharging the sewage at a distance of more than 12 miles from the nearest land, and proceeding at not less than 4 knots (in case Plant stopped for maintenance)
Where the vessel is operating in waters under the jurisdiction of a State where the local requirements are more stringent than above, these shall be complied.
The Chief Engineer or Officer is to confirm that the sewage overboard valves is positively locked in the closed position to ensure no accidental direct discharge.
Sewage Treatment Plant
The Master shall keep on board the certificate of type-approval of the Sewage Treatment Plant including the USCG Certification (provided by the manufacturer).
Operation and Maintenance of Sewage Treatment Plant
The Master shall designate the officer in charge to have him carry out the following matters:
1. Keep operating the Sewage Treatment Plant all the time, in principle.
2. The inspection and maintenance shall be done in accordance with the Makers Instruction Book.
For the type which requires addition of chemicals, these should be stocked, and added as required by manufacturer’s instruction.
Rules and Regulations for Reference :
• MARPOL Annex IV (IMO)
• U.S. Regulation, 33CFR, Part 159 (Marine Sanitation Device)
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