Wastewater treatment system and method

A method for disposing of vessel wastewater comprising:

• treating the wastewater by separating and isolating oily waste from the wastewater to produce substantially oil-free treated water and storing the separated and isolated oily waste in an oil store, and separating and isolating solids from the substantially oil-free treated water in a solids treatment unit to produce a treated water that is substantially solids-free and oil-free, storing the treated water in a make-up tank and storing the separated and isolated solids in a solids store;
• pre-heating the treated water in the make-up tank and circulating the pre-heated treated water between the solids treatment unit and the make-up tank to repeatedly separate and isolate solids from the pre-heated treated water;
• transferring the pre-heated treated water from the make-up tank to an evaporator;
• transferring heat from a heat input through an evaporation element of the evaporator to the pre-heated treated water to produce evaporation water and circulating the evaporation water between the evaporator and the make-up tank;
• and,
• evaporating the evaporation water from the evaporator.