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Production of algal biomass in coastal lagoons
Søren Laurentius Nielsen
Department of Environmental, Social and Spatial Change
Roskilde University, Denmark
Purpose:
• To assess the feasibility of algal biomass production in a low-tech, local setting
• Focus on pollution mitigation– Nutrients (coastal eutrophication)
– CO2
• Bioenergy and production of high-value products a secondary priority
N retention in algal biomass
P retention in algal biomass
Glucose content in biomass (g/g DM)
Efficiency of ethanol conversion (67 hrs)
CH4 yield in fermentation (300 hrs) (Nm3/ha)
75 % 42 % 0,1378 ± 0,0090 10,73 ± 2,88 % 10860 ± 2360
Results from Onsevig lagoons
• Significant nutrient retention in biomass – but room for improvement
• Low ethanol conversion efficiency – needs more work
• Methane yield from fermentation of biomass residues comparabel with or larger than the yield from corn
Production – over 300 hrs.
Dry matter 3.01 g l-1 Ethanol 0.0146 ± 0.0005 g g-1 dry matter 0.0439 g l-1 CH4 330 ± 50 ml g-1 dry matter ~ 1 l l-1
Results from Søllested
• Production of microalgal biomass is feasible in municipal waste water
• CO2 – addition from district heating enhances growth
• Good potentials
• Much further work needed concerning best practise and best use of biomass
The future
• An Algal Innovation Center has just opened on Lolland
• We are developing proposals for European Union funding– FP7– COST
• We invite interested collaborators!• We are interested in biofuels, high-value
products and pollution mitigation