Increasing waterborne PO4… Sonesten 2016 shows increasing PO4 loads despite decreasing TP http://havsmiljoinstitutet.se/digitalAs sets/1575/1575894_havet_2015_1 6.pdf (p 43)
Managing Internal Nutrients Ongoing activities in Sweden Philip Axe Philip.axe@havochvatten.se
Ongoing activities • Additional financing for measures to counter eutrophication 2019 • Knowledge development • EIA framework – a way to structure questions • Activities in fresh and coastal waters • Biomanipulation (f) • Aluminium precipitation (f) • Sediment removal (f) • Mussel farming (c) • Irrigation (c) • Monitoring of earlier projects (Björnöfjärden) 5/31/2019 3
Freshwater – biomanipulation and aluminium treatment • Lake system around Växjö • Conventional measures implemented but apparently not effective • Large biomass of bream maintaining turbidity • Test case for using 9th Chapter in licensing • Expect maybe a 30% reduction in P at the river mouth 5/31/2019 4
Växjö 5/31/2019 5
EIA Framework (programme for work – to be confirmed) • Location of activity • Expected change in conditions • Energy use • Activities to minimize negatve effects • Waste produced • Activities to achieve environmental targets • Alternative proposals • Popular summary • Motivation of chosen method • Summary of consultation procedures • Justification of location • Magnitude of work • Accident preparations • Alternatives • Measurement programme • Environmental conditions • Impact on Natura 2000 5/31/2019 6
Need to identify problem coastal areas • Is there still P leaking from the seabed? • 300 k€ to map coastal bays • 300 - 600 k€ for mapping transects from the coast • Mapping mobile & stable phosphorus + • Nutrients & oxygen in water & porewater • HazSubs in sediment Lines are a guess from memory 2019-05-31 7
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