1. 2.3 Waste Management – Revised IBTS
Regulation 12 – Tanks for oil residues
Integrated Ballast Treatment System
Separation of Clean and Dirty Drains
Pre-treatment of Oily Drains
Minimum Sludge Tank Capacity
Revoking of UI (Minimum Sludge Tank Capacity is 50% if an Homogenizer or Sludge Incinerator is fitted)

2. Regulation 12 – Tanks for Oil Residues
2 Oil residues (sludge) may be disposed of directly from the oil residue (sludge) tank(s) through the standard discharge connection referred to in regulation 13, or any other approved means of disposal. The tank(s):
.1 shall be provided with a designated pump that is capable of taking suction from the oil residue (sludge) tank(s);
.2 shall have no discharge connections to bilge system, oily bilge water holding tanks, tank top or oily water separator; and
.3 may be fitted with drains, with manually operated self-closing valves, for the collection of settled water or an alternative arrangement, provided such arrangement does not connect directly to the bilge piping system.

3. Integrated Bilge Treatment System
Clean Drains
Main Engine Air Cooler Drain
Cooling Fresh Water, Sea Water
Steam Drain, Boiler Water
Drain to the Clean Drain Tank and can be Pumped directly overboard.

4. Integrated Bilge Treatment System
Oil Residues (Sludge)
Hydraulic Oil Pump & Tank Coaming Drain
Waste Oil Pump & Tank Coaming Drain
LO Pump & Tank Coaming Drain
Bilge Equipment Coaming Drain
Main Engine Scavenge Drain
Compressed Air Drain
Purifier Sludge
Bilge Primary Tank (Oil Side)
Workshop Drain
Drain to the Sludge Tank for discharge Ashore or Incineration

5. Integrated Bilge Treatment System
Oily Bilge Water
Engine Room Scuppers
Engine Room Bilges
Drain/Pumped to Primary Bilge Tank for pre-treatment to separate oil and water phases.
Water side drains to Bilge Holding Tank and discharge via OWS
Oil Side Drains to Sludge Tank

6. Example of a Bilge Primary Tank

7. Minimum Sludge Tank Capacity
Incinerators
Operation during Manned periods only, e.g. 8 hours per day.
Port stays and stand by passages restrict operation.
Homogenizers
Effectiveness
UI will be revoked with amendments to MARPOL Annex I