ANNEX II
Table 1
Waste Generation Rates for Annexes I, IV and V to the MARPOL Convention ( 1 )
Type of waste
Generation rate
Driver
On-board treatment
Oily bilge water
0,01-13 m 3 per day, larger ships generate larger quantities.
Condensation and leakages in the engine room; size of the ship.
The amount can be reduced by 65-85 % by using an oil water separator and discharging the water fraction into the sea.
Oily residues (sludge)
0,01 to 0,03 m 3 of sludge per tonne of HFO.
0 and 0,01 m 3 per tonne of MGO.
Type of fuel; fuel consumption.
Evaporation can reduce the amount of sludge by up to 75 % ( 2 ) .
Incineration can reduce the amount of sludge by 99 % or more.
Tank washings (slops)
20 to hundreds of m 3
Number of tank cleanings; size of loading capacity.
After settling, the water fraction may be discharged at sea.
Sewage
0,01 to 0,06 m 3 per person per day. Sewage is sometimes mixed with other waste water. The total amount ranges from 0,04 to 0,45 m 3 per day per person.
Number of persons on-board; type of toilets; length of voyage; type of treatment: the operation of a sewage treatment plant, or comminuting and disinfection system provides different quantities of waste
Effluent from treatment plants is often discharged at sea where permitted under MARPOL Annex IV.
Plastics
0,001 to 0,008 m 3 of plastics per person per day.
Number of persons on-board.
Often not incinerated.
Dirty plastics (plastics that have been in contact with food) are often treated as a separate waste stream.
Food wastes
0,001 to 0,003 m 3 per person per day.
Number of persons on-board; provisions.
Where permitted under MARPOL Annex V, food waste is often discharged at sea.
Domestic wastes
0,001 to 0,02 m 3 per day per person.
Number of persons on-board; type of products used.
Cooking oil
0,01 to 0,08 litres per person per day.
Number of persons on-board; type of food prepared.
Although not permitted, cooking oil is sometimes still added to the sludge tank.
Incinerator ashes
0,004 and 0,06 m 3 per month.
Use of incinerator; cost of using incinerator.
The incinerator is not used for all types of waste, mostly for paper sometimes for oily sludge.
Operational wastes
0,001 to 0,1 m 3 per person per day.
Size of the ship; type of cargo.
Cargo residues
0,001-2 % of cargo load.
Type of cargo.
Size of ship.
Table 2
Waste Generation Rates for Annex VI to the MARPOL Convention on waste (exhaust gas cleaning systems, ‘EGCS’)
Type of EGCS
Coefficient
Unit
Examples
(10 MW engine or HFO consumption 40 t/day)
Manufacturer 1
Open loop sludge amount
0,1
kg/MWh
0,1 × 10 MW × 24 = 24 kg/day
Closed loop sludge amount (DAF- BOTU)
3,5 -7,0
kg/MWh, depending on
SFOC, MCR and fuel quality
3,5 × 10 MW × 24 = 840 kg/day
Closed loop sludge amount (BOTU-M)
3,0
l/MWh/S%, depending on SFOC, MCR and fuel quality
3,0 × 10 MW × 24 × S2,5 % = 1800 l/day
Manufacturer 2
Closed loop sludge amount
2,5 -3,0
kg/consumed HFO t
2,5 × 40 t/day = 100 kg/day
NB : The amount of exhaust gas cleaning system sludge generated depends ultimately also on the individual installation specifics: the exhaust gas cleaning system manual provided by the manufacturer should therefore be consulted. Information in the tables provided by stakeholder companies.
( 1 ) Extracted from EMSA’s study ‘The Management of Ship-Generated Waste On-board Ships’, January 2017.
( 2 ) Evaporation of the water fraction in oil sludge is a process that must be carefully managed and should only be done to the extent to allow combustibility of the sludge intended for incineration.
