Treatment of wastewater from ships
In this section you will find technique that enables handling and treatment of wastewater from ships and boats. The documents show both shore-based pump-out facilities and vessel-borne facilities.
Discharge of sewage from passenger ships in the Baltic Sea will be banned from 2013 for all new boats, and from 2018 for all ships . Wastewater from ships is, like other types of wastewater, a cause of eutrophication as it contains a large amount of phosphorus and nitrogen. Other contaminants in water discharged from ships, for example organic compounds, such as oil, grease and fuel, are also a cause of pollution of the marine environment.
It is today common practice for ships to flow their wastewater over board. In order to make sure that the wastewater is treated before reaching the sea, a solution that is easy to use, does not consume much space on the ship and that is inexpensive will be needed.
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Macerator/ejector pump for small boats
Document US4324007 shows a sanitary system for a boat, especially for small boats which often have limited holding tank capacities. These tanks must be pumped out frequently because of the limited capacities and generally they do not have means for monitoring the level in the tank. The tank according to the invention has a macerator/ejector pump within the tank, which macerator can liquefy waste material and which macerator/ejector pump also can be used to discharge the sewage into an on-shore waste collection system without the need for a shore-based pump-out station which normally is required. The tank is also provided with a plurality of rods extending into the holding tank for sensing the level of waste material.
Shore-based waste removal system
Document FR2769030 describes a waste removal system which removes waste stored in tanks on board of boats at the quay side. The system works in two stages. The first stage uses high vacuum to draw the sewage from the boat to a collecting tank at the quay. During the second stage, the sewage is drawn to a processing station and in the same time air is let in for easier transport.