Recycling the Residues from Anaerobic Digesters as a Nutrient Source for Seaweed Growth

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Abstract
The rhodophyte Gracilaria tikvahiae was cultivated in an aquaculture system to study its feasibility as a source of biomass that can be fermented to produce methane gas. Because N and other nutrients were conserved within the digester, the digester residues were a rich source of plant nutrients. Rather than being only waste products that require disposal, these residues can be recycled within the aquaculture system to produce additional seaweed biomass or, alternatively, might be used in agriculture to replace conventional fertilizers. For every 100 g of N added to the digester in the form of Gracilaria, 73 g of N were completely recycled from the digester back to cultures of Gracilaria.

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