The use of active barriers for the nutrient removal and local water quality improvement in Baltic lagoons

There are many attempts to use mussels or algae cultivation for nutrient removal in the South Baltic area. However, due to low market value of cultivated products, these developments typically end in the initial stage of demonstration studies and are neither sustainable, nor replicated in other than pilot areas. On the other hand there are commercial applications called in general 'living' or 'active' barriers (e.g. life rafts, BIOHAVEN® LIVING SHORELINE) aimed at both restoration and rehabilitation of coastal habitats and local enhancement of water quality by nutrient absorption and removal. Our idea is to involve the coastal municipalities in the South Baltic lagoons into the application of so called 'active' or 'living' barrier units to improve water quality and create bathing conditions inside the South Baltic lagoons, where at normal conditions algal blooms and sediment resuspension prevent recreational bathing. We also plan to link these applications to nutrient quota trading - mechanism for connecting effective nutrient abatement measures with voluntary financiers willing to acquire nutrient offset, relevant for the small coastal communities (especially in cross-border lagoons) pressed for the increased removal of nutrients through the municipal wastewater treatment plants, which are facing operational problems due to sharp fluctuations of population (a tenfold increase during the summer season). Our envisaged results include small scale local improvement of water quality (pilot installations), but, most importantly, increased awareness of local stakeholders interested in water quality and tourism (municipalities, PA administrations) and innovations (SMEs) of our tested technological applications. The cross-border co-operation will allow us to test both technological and socio-economical methodology in different environments including 2 cross-border case studies.The entire WP5 will be dedicated to ensure a long-term durability of project results . The key to the successful durability of project results is showing their utility value through additional income from tourism and by building a synergy with the NutriTrade project of the Central Baltic Cross-border Cooperation Programme and HELCOM efforts on nutrient load reduction in the Baltic Sea.1) Physical installations capable of small scale removal of nutrients from semi-enclosed costal areas in the South Baltic, 2) The innovative small-scale green technology to trap and remove nutrients.