algae biomass for bio fuels and other uses-is it

Part-financed by the European Union (European Regional Development Fund)

Algae biomass for bio fuels and other uses-is it sustainable or not?

Associate Professor Fredrik Gröndahl

Industrial Ecology, KTH, Stockholm, Sweden

E-mail: [email protected]

Fredrik Gröndahl, Industrial Ecology, KTH

Results –Stock estimate in Trelleborg

Coastal stretch (km) Filamentous Biomass [tonnes]

Biomass per km coast [tonnes per km]

Reference

Trelleborg, 58 km (total stock)

19 000 dwt 320 This study

Swedish southern coast, 2192 km (attached stock)

25 200 dwt 12 (Kautsky, 1994, Kautsky and Kautsky, 1994)

Swedish Baltic Proper coast, 10640 km (attached stock)

100 000 dwt 9 (Kautsky, 1994, Kautsky and Kautsky, 1994)

dwt –dry weight

Presenter

Presentation Notes

The summer stock of red filamentous algae in TB is estimated from monitoring data and in august 2009 the stock about 20 000 tonnes dry weight of red filamentous biomass is present. When this estimate is compared to previous estimates it is a large amount. However in comparison to other coastal stretches TB has a long shallow coastline with warm waters and weak currents, suitable for red filamentous algae growth.

Results - Harvesting in Trelleborg • 2 000-6 000 tonnes dwt

(10-30 % of standing stock)

• 50-150 tonnes N reduction 5-15 % of annual freshwater runoff

• 170-500 households can be heated annually

Presenter

Presentation Notes

If you harvest 10-30 % of the stock in TB you would get 2000-6000 tonnes of red macrolgae biomass, this would give an nutrient reduction of 50 to 150 tonnes of nitrogen annually and is equal to 5-15 % of the nitrogen load from freshwater runoff annaully from Trelleborg. An additional value, apart from the nitrogen reduction biogas that can provide heating for 170 hoeshulds annually can be produced from the biomass Of course this is just the energy output from the biomass, there will be energi input into the system in order to produce the biogas.

Wild harvesting of Cyanobacteria in the Baltic Sea

http://www.formas.se/default____529.aspx

algae biomass for bio fuels and other uses-is it

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