oily bilge water

Hola! Estoy con un documento un poco técnico y quería saber si alguien podía ayudarme con el significado de "oily bilge water". Les paso el contexto:

The design of *** eliminates the need for flocculants and chemical additives to remove the emulsified oily bilge water.

Gracias colegas!!;)

"Oily bilge water" refers to water accumulated in part of the ship's hull. It could be translated as "aguas oleosas de sentina" or simply "aguas de sentina".

Thanks Uma! Your explanation was really helpful.:)