Biogas

The need for biomass for production of biogas is said to increase in line with higher demand for biogas fuel. There is already a competition in that biomass with a yield of biogas is highly demanded by industrial producers of biogas. There is also an unfortunate conflict in use of arable land for production of biogas and ethanol feedstock and the production of food. By localizing the feedstock production to the sea, the competition with arable land is avoided.

Biogas yield was measured in tests conducted by AnoxKaldnes AB (sept. 2009) where different mixtures were evaluated as digestible substrates. The highest gas yield was measured to 35 Nm3 methane / ton substrate (wet weight) in co-digestion with waste water sludge. In 2011 the tests was done once again with improved substrate, now the ascidian biomass yielded 300 Nm3/ ton carbon. The values are given per tonne carbon since this is the fraction that is converted into biogas - water excluded.

Biogas