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MARPOL Annex IV: Sewage Discharge Requirements etc (Ships must: ((Ship…
MARPOL Annex IV: Sewage Discharge Requirements etc
Ships must:
Ship must be more than 12 miles off shore to discharge non-comminuted or treated sewage.
Ship must be proceeding en-route
Be more than 3 miles from land to discharge comminuted & disinfected sewage
The ships speed when discharging should exceed 4 kts
Sewage that has been stored in holding tank must not be discharged instantaneously but at a moderate rate.
Ships must have
System that comminutes (breaks up) and disinfects sewage
A sewage holding tank
A sewage treatment plant
Definition of sewage
Drainage from medical facilities
Drainage from spaces containing living animals
Drainage & waste from toilets, urinals and WC scuppers
Other waste waters
Certification Requirements
Valid 5 years
Initial survey before ship in service
International Sewage Pollution Prevention Cert
Periodical surveys as determined by Administration
Sewage Treatment Plant, certified by administration as compliant The plant must be sufficient for max number of persons onboard. The sewage holding tank capacity must be sufficient capacity for when overboard discharge of treated effluent is not permitted. eg when in port etc.
Sewage Plant
Regular flushing through of the plant is to be avoided if it is to operate as designed. This flushing gets rid of the essential bacteria
Chlorine used for effluent treatment prior to overboard discharge has a shelf life and so good stock control as part of planned maintenance is essential.
From start-up will take 7-10 days before effluent is to optimum , friendly bacteria need to become established in the plant
Ensure the correct planned maintenance schedule is being complied with to avoid problems