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  • 2021 December 8 17:06

    Sewage from cargo ships may be legally discharged into the Baltic Sea - Gasum

    Sewage from cargo ships may be legally discharged into the Baltic Sea, although it accelerates eutrophication. The Baltic Sea Action Group is bringing together cooperation parties for the new Ship/t Waste Action project that produces biogas from sewage discharged by ships at the port.

    The cooperation promotes the circular model of turning sewage into biogas that will be used as fuel by heavy traffic. The Ship/t Waste Action cooperation develops waste value chains between different parties, and the port of HaminaKotka is the first location.

    Kymen Vesi treats the sewage discharged by cargo ships at the port of HaminaKotka. The wastewater sludge created in the process is refined into renewable energy at Gasum’s biogas plant. Kymen Vesi also takes samples of the wastewaters discharged by ships, which generates research data on, for example, nutrient content.

    Other parties of the circular cooperation are shipping companies from Finland eg Meriaura and RABN, and abroad eg Essberger & Stolt Tankers, Utkilen and Maersk. Shipbrokers C&C Port Agency, Dahlberg’s Agency and GAC Finland participate, too. Transportation company Autoyhtymä Vuorinen takes care of the sewage transports.

    Wastewater and food waste contain, for example, nutrients, bacteria, fats, chemicals and microplastics. If wastewater and food waste are discharged into the sea, they accelerate two of the worst problems of the Baltic Sea: eutrophication and oxygen depletion.

    There are approximately 2,000 ships operating in the Baltic Sea every moment, and 95 % of these are cargo ships. Approximately 25,000 seafarers sail on the ships. It is legal to discharge greywater, sewage and ground food waste into the Baltic Sea.

    Passenger ships, such as the ferries between Finland, Sweden and Estonia, have been voluntarily discharging their wastewaters at the port for years. Since 2021, the IMO regulations prohibit discharges of untreated sewage from passenger ships in the Baltic Sea. There is no similar regulation for cargo ships.

    All discharge into the sea is unnecessary. This is why waste from ships should be discharged at the port and recovered.

    These new voluntary measures will lead the way for responsible operators both on land and at sea.




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