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Macroalgae in a circular bioeconomy: Environmental and economic sustainability assessment of seaweed as instrument for CO2 biosequestration, water quality restoration and biobased production

Activity: Talk or presentation typesLecture and oral contribution

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Marianne Thomsen - Lecturer

A framework for analyzing the environmental and economic performance of seaweed production and biorefinery systems, developed within the project MAB3 (www.mab3.dk), is presented. A circular economy based on local blue biomass, i.e. seaweed, cultivation systems using excess aquatic nutrients and atmospheric CO2 producing blue bioresources for local biobased production and future BBIs. Data needs for a full break-even analysis and forecasting as function of the productivity, technology steps and resulting output products are illustrated through case studies. We modelled two basic production systems: A biorefinery system producing ethanol and proteins (EP), and system producing biogas and fertilizers (BF) as main products. The environmental and economic performance of the modelled systems are aligned when looking at water quality restoration. However, the return on investments (ROI) of EP system is higher compared to the BF system, while the climate change mitigation service is opposite directed; i.e. lowest for the highest RoI system. The welfare economic value of the ecosystem services delivered by the seaweed cultivation and biorefinery system ranges between 5 and 20% of the raw seaweed production costs.
12 Oct 2016

Event (Conference)

LocationKystvejen's Hotel and Conference Center, Kystvej 26, 8500 Grenaa, Denmark

ID: 101878954