concrete ways of reducing microplastics in stormwater and ... · microplastics in stormwater and...
TRANSCRIPT
FOR PROTECTION OF THE BALTIC SEA ENVIRONMENT
Concrete Ways of Reducing Microplastics in Stormwater and
Wastewater
Nils Höglund,
MSCG April 2017
Conclusions
• MPs in stormwater & wwtp effluents • MP amounts released by stormwater ≥ by wastewater
• MPs <300 µm abundant
• Large variations of MP conc. in wastewater
• Black particles in large concentrations – Tyre wear?
• End-of-pipe solutions important
• Constructed wetlands and stormwater ponds efficient barriers for MPs in water
Micro plastic…
4 Studied facilities –
constructed ponds and
wetlands
Sampling by pump: -20 µm filters -300 µm filters (one at the time)
Method
Complementary sampling - Filtration through 20 µm filters
Also, for verification - Simple melting test - FTIR spectroscopy
Visual analysis of filters
Results: measured occurrence
Results: Reduction after wetland/pond
Summary
Conclusions
• Study shows MPs content in stormwater & wwtp effluents o MP amounts released by stormwater ≥ by
wastewater
o MPs <300 µm abundant
o Large variations of MP conc. in wastewater
o Black particles in large concentrations – Tyre wear?
• End-of-pipe solutions important as well as upstream work
• Constructed wetlands and stormwater ponds efficient barriers for MPs, reducing also nutrients, pharmaceuticals