Evac is the global leader in designing and sizing marine waste water treatment systems. Contact us for detailed information and analysis of your needs. The following information is offered as a general overview.
Waste water treatment plants are sized on the basis of biological oxygen demand over a 5 day period (BOD5 load) and the flow rates of the waste water to be treated. These values should never exceed the values defined in the certificate of type approval of the selected plant.
The first step in sizing the plant is to define the volume and the BOD5 concentration of the waste water streams. BOD5 values are defined according to the number of passengers, ship type, and ship operation profile per each waste water stream to be treated (black water, grey water, galley water, laundry water).
The waste water flow rates are then taken into account in order to select the correct treatment plant. These values typically represent the flow in litres per passenger per day. Evac can work with figures provided by ship owners, or we can recommend values based on experience gained through our many installations.
After the required capacity is determined, Evac has a wide range of waste water treatment systems available, including membrane bio-reactor (MBR) and physical/chemical systems, to ensure that the unique operational requirements and restrictions of each vessel can all be addressed with the proper technologies.
