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Oily Bilgewater Separators


Year: 2011
Language: english
Author: EPA
Genre: Documentation
Format: PDF
Quality: eBook
Pages count: 98
Description: EPA’s 2008 Vessel General Permit for Discharges Incidental to the Normal Operation of
Vessels (VGP) also addresses discharges of oil, including oily mixtures, from ships subject to
MARPOL. Such discharges must have concentrations of oil less than 15 ppm. The VGP also
includes technology-based effluent limits and related requirements for specific discharge
categories, including bilgewater discharges.
Bilge separators, oil content meters and bilge alarms are certified by the U.S. Coast
Guard to meet 46 CFR 162, which implements MARPOL Annex I regulations in the U.S. More
than one hundred bilge separators have been certified by the U.S. Coast Guard to meet the
MARPOL 15 ppm oil discharge standard. All of these bilge separators are treatment systems that
combine a gravity oil-water separator (OWS) or centrifuge with one or more additional unit
operations that “polish” the bilgewater effluent to reduce concentrations of emulsified oil. Unit
operations that are added to OWS/centrifuge-based bilge separator systems include:
• Absorption and Adsorption,
• Biological Treatment,
• Coagulation and Flocculation,
• Flotation, and
• Ultrafiltration .
EPA evaluated the effectiveness of bilge separators by their ability to achieve low
effluent oil concentrations.

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