Plant for the treatment of waste water on board of vessels

A plant for the treatment of on board produced waste water comprising black water and grey water, while on board of vessels, comprising:

• a first collection tank is connected with a discharge of grey water from a kitchen and a galley produced on board and is configured to continuously receive and discharge the grey water from the kitchen and the galley, the first collection tank comprising a first output connected to an oil separator, wherein the grey water is conveyed to the oil separator comprising a third output;
• and
• a second collection tank is connected with a discharge of black water, the second collection tank comprising a second output;
• a primary treatment unit comprising a band filter, the third output and the second output connected to the primary treatment via a pipe, wherein both the grey water from the first collection tank and the black water from the second collection tank are treated collectively in the band filter;
• means for feeding a first filtrate obtained from said primary treatment unit to a secondary treatment unit comprising at least one micro-filtration or ultra-filtration filter;
• and
• means for feeding a second filtrate obtained from said secondary treatment unit to a tertiary treatment unit including at least one ozone treatment module,
• wherein the band filter is a device comprising a slanted endless filter band driven by a series of rollers inside a container in which the black water and grey water are forced to pass in a diagonal course on the slanted endless filter band and having a portion which runs horizontally with a filtrate faced downwards, and a blowing device placed behind the slanted endless filter band blowing air toward the filter band configured to remove residues detached from a filter mesh, transported out by a screw conveyor placed below the blowing device,
• wherein the plant is configured to concurrently treat on board produced waste water comprising black water and grey water fed to the plant while on board of vessels, and
• wherein said tertiary treatment unit further comprises at least one reverse osmosis filter downstream said at least one ozone treatment module.