A comparative environmental life cycle assessment of hatchery, cultivation, and preservation of the kelp Saccharina latissima
Journal article, 2021

Seaweed cultivation and processing industries could contribute to sustainable blue growth and the European bioeconomy. This article contributes a case study evaluation of environmental sustainability of preserved brown seaweed Saccharina latissima by means of environmental life cycle assessment of a pilot facility in Sweden. The study accounts for nutrient bioremediation and carbon capture and includes two alternative hatchery processes, a 2-ha longline cultivation, and four alternative preservation methods (hang-drying outdoors, heated air-cabinet drying, ensiling, and freezing). The study found that as a result of carbon capture and nitrogen and phosphorus uptake (bioremediation) by seaweed, more CO2 and PO4 equivalents are (temporarily) absorbed than emitted by the supply chain. The extent of emissions is most affected by preservation methods undertaken. Impact profiles of the supply chain show that the greatest impact shares result from freezing and air-cabinet drying, both the two most energy-intensive processes, followed by the cultivation infrastructure, highlighting strategic optimization opportunities. Hatchery processes, harvesting, and the low-energy ensilage and hang-drying outdoors were found to have relatively small impact shares. These findings presage the environmentally friendliness of seaweed-based products by documenting their potential to mitigate eutrophication and climate change, even when taking a life cycle perspective.

marine bioeconomy

brown seaweed or kelp cultivation and preservation


life cycle assessment


blue growth

climate change mitigation

environmental impacts

eutrophication mitigation


J. B. E. Thomas

Royal Institute of Technology (KTH)

M. Sodre Ribeiro

Royal Institute of Technology (KTH)

J. Potting

Royal Institute of Technology (KTH)


G. Cervin

University of Gothenburg

G. M. Nylund

University of Gothenburg

Joakim Olsson

Chalmers, Biology and Biological Engineering, Industrial Biotechnology

Eva Albers

Chalmers, Biology and Biological Engineering, Industrial Biotechnology

Ingrid Undeland

Chalmers, Biology and Biological Engineering, Food and Nutrition Science

H. Pavia

University of Gothenburg

F. Grondahl

Royal Institute of Technology (KTH)

ICES Journal of Marine Science

1054-3139 (ISSN) 1095-9289 (eISSN)

Vol. 78 1 451-467

Seaweeds for a Biobased Society - farming, biorefining and energy production (SEAFARM)

Formas (213-2013-92), 2013-01-01 -- 2017-12-31.

Subject Categories

Other Environmental Engineering

Environmental Analysis and Construction Information Technology

Energy Systems



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