MARPOL Annex IV: Sewage Discharge Requirements etc (Sewage Plant ( (Ensure…
MARPOL Annex IV: Sewage Discharge Requirements etc
Ensure the correct planned maintenance schedule is being complied with to avoid problems
From start-up will take 7-10 days before effluent is to optimum , friendly bacteria need to become established in the plant
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.
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
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.
Periodical surveys as determined by Administration
International Sewage Pollution Prevention Cert
Initial survey before ship in service
Valid 5 years
Definition of sewage
Other waste waters
Drainage & waste from toilets, urinals and WC scuppers
Drainage from spaces containing living animals
Drainage from medical facilities
Ships must have
A sewage treatment plant
A sewage holding tank
System that comminutes (breaks up) and disinfects sewage
Sewage that has been stored in holding tank must not be discharged instantaneously but at a moderate rate.
The ships speed when discharging should exceed 4 kts
Be more than 3 miles from land to discharge comminuted & disinfected sewage
Ship must be proceeding en-route
Ship must be more than 12 miles off shore to discharge non-comminuted or treated sewage.