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Micro-algae and Macro-algae (biogas)


Technology Description

Similar to anaerobic digestion of non-algae feedstock, except that the feedstock is either the remnants of micro-algae after lipid extraction or macro-algae (seaweed). The bacteria break down the algae without oxygen and in the process produce biogas, composed mostly of methane (50-75%) and carbon dioxide (25-45%). Biomass can be in the form of animal manure, organic portion of municipal solid waste (MSW), industrial waste such as dry distillers grain (DDG) from ethanol production, agricultural residues and energy crops. The biogas can be burned directly, without upgrading to biomethane.

Relevance for Net Zero

Alternative biomass feedstocks exist, and algal feedstocks for bioenergy have not yet reached commercialisation. However, algae production has the potential to unlock significantly more sustainable biomass that can speed up the pathway to net zero and/or provide additional biomass feedstocks beyond net zero.

Key Countries

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