In controlling pollution, which action should be taken after all dirty ballast has been transferred to the slop tank and prior to discharge through the oily water separator?
ā¢ Oily water separator (OWS) operation requirements under MARPOL and 33 CFR ā¢ Behavior of oil and water mixtures in a slop tank ā¢ What must happen to oil and water phases before using an oily water separator
ā¢ Think about how oil and water behave once they are put together in a tank and the ship is no longer pumping or mixing them. What natural process helps reduce the oil content of the water phase? ā¢ Which option, if done right after transferring dirty ballast into the slop tank, would best prepare the mixture so that the oily water separator can work more efficiently and stay within discharge limits? ā¢ Which choices might actually increase pollution risk or violate basic MARPOL/USCG practices rather than reduce it?
ā¢ Identify which option allows separation of oil and water phases before running the oily water separator. ā¢ Eliminate any option that would increase mixing or emulsification of oil in water instead of letting it separate. ā¢ Consider which option is consistent with pollution prevention procedures on tankers handling dirty ballast and slops.
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