Production of algal biomass in coastal lagoons Søren Laurentius Nielsen Department of Environmental, Social and Spatial Change Roskilde University, Denmark
Dec 18, 2015
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