In discharge of bilge from a ship's engine room to the sea, the oil content of the effluent shall not exceed 15 parts per million.
To improve the performance of oily water separators, we analyzed bilge water characteristics then fabricated a prototype filtration unit and evaluated its performance. Test samples were collected from actually operating ships and compared with the test liquid stipulated by the IMO.
Some proposals are presented for processing oily water in the ship's engine room.
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