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The Welsh Assembly Government (press release) is supporting a trial looking at how to use algae to feed off liquid digestate by-products from anaerobic digestion plants. It has given a £50,000 grant to community group Merlin Bio-developments to investigate the potential to further reduce the carbon footprint of AD facilities by using the liquid residues from the plants to encourage algae farming. Merlin Bio-developments said the algae could be used to capture carbon dioxide emitted from the AD process.

Currently, anaerobic digestion plants turn organic waste into bio-gas, a renewable source of energy. These plants are to play a major role in energy production in the coming years. As well as producing clean energy, the plants produce a by-product called ‘digestate’ that can be used as compost and a liquid fertiliser. The Assembly Government wants to see if extracts from the liquid element of this digestate can be used to grow algae, and potentially create a whole new market.

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