In the Finnish southern port of Hamina-Kotka, has begun the process of transforming the waste discharged from freighters into biogas that can be used as fuel for trucks.

The port, which is located in Kymenlaakso along the Gulf of Finland, is one of the country's busiest seaports, receiving an average of 2,500 freighters a year.

The wastewater management project was sparked by the Baltic Sea Action Group, a Finland-based NGO working towards restoring the ecological balance of the Baltic, one of the most polluted seas in the world.

For further reading, YLE reports from the Nordic state port.