bilge water treatment IBTS

1.  a)  Briefly explain the Concept of Integrated Bilge Water Treatment System (IBTS). [4 Marks]
b)   Sketch and describe a Pre-treatment unit for oil separation which can be used        incorporated with IBTS                                                                  [4 Marks]
c)   State the definition of “Oil residue (sludge)” [3 Marks]
d)  Draw a flow diagram of oil residue (sludge) collection and disposal arrangement which can be used incorporated with IBTS.                                                  [5 Marks]                           
a)Any water or oily water mixture drained to machinery space bilges is considered as bilge water. Bilge water required to be pumped through oil discharge monitoring device. The Integrated Bilge Water Treatment System (IBTS) is a system to minimize the amount of oily bilge water generated in machinery spaces by treating the leaked water and oil separately.  It also provides an integrated means to process the oily bilge water and oil residue (sludge). It is achived by collecting clean drain water in a separate tank named as clean bilge tank and pumping them direct over board
Any bilge water accumulated are separated in a primary bilge tank by introducing heat and gravity separation that way total bilge water quantity or bilge water is reduced and amount of oil that has to be handled by the OWS is reduced making it easier to comly with the pollution prevention regulations

Primary bilge tank used as the pretreatment unit  oliy water enters through  the oil enters and oil floats  on the surface while water passes to the otheside of the tank from the space underneath the separation plate in the next compartment. Water over flows to the next compartment from the top od the separation plate where oil is further separated. After separation of most of the oil ,water is drawn through the inlet from the bottom of the final compartment and transferred to bilge holding tank separation process is speeded by providing by heating the oily water mixture

Oil floats on the surface drained through scum down trays

c)  means the residual waste oil products generated during the normal operation of a ship such as those resulting from the purification of fuel or lubricating oil for main or auxiliary machinery, separated waste oil from oil filtering equipment, waste oil collected in drip trays, and waste hydraulic and lubricating oils