Increasing waterborne PO4 Sonesten 2016 shows increasing PO4 loads - - PowerPoint PPT Presentation

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)

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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

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Växjö

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EIA Framework

(programme for work – to be confirmed)

• Location of activity
• Energy use
• Waste produced
• Alternative proposals
• Motivation of chosen method
• Justification of location
• Magnitude of work
• Alternatives
• Environmental conditions
• Expected change in conditions
• Activities to minimize negatve effects
• Activities to achieve environmental

targets

• Popular summary
• Summary of consultation procedures
• Accident preparations
• Measurement programme
• Impact on Natura 2000

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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

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Lines are a guess from memory