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Harvesting of drifting filamentous macroalgae in the Baltic Sea: An energy assessment
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.ORCID iD: 0000-0003-3745-4092
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Industrial Ecology.ORCID iD: 0000-0002-4530-3414
2014 (English)In: Journal of Renewable and Sustainable Energy, ISSN 1941-7012, E-ISSN 1941-7012, Vol. 6, no 1, 013116- p.Article in journal (Refereed) Published
Abstract [en]

Eutrophication combined with climate change has caused ephemeral filamentous macroalgae to increase and drifts of seaweed cover large areas of some Baltic Sea sites during summer. In ongoing projects, these mass occurrences of drifting filamentous macroalgae are being harvested to mitigate eutrophication, with preliminary results indicating considerable nutrient reduction potential. In the present study, an energy assessment was made of biogas production from the retrieved biomass for a Baltic Sea pilot case. Use of different indicators revealed a positive energy balance. The energy requirements corresponded to about 30%-40% of the energy content in the end products. The net energy gain was 530-800 MJ primary energy per ton wet weight of algae for small-scale and large-scale scenarios, where 6 000 and 13 000 tonnes dwt were harvested, respectively. However, the exergy efficiency differed from the energy efficiency, emphasising the importance of taking energy quality into consideration when evaluating energy systems. An uncertainty analysis indicated parametric uncertainty of about 25%-40%, which we consider to be acceptable given the generally high sensitivity of the indicators to changes in input data, allocation method, and system design. Overall, our evaluation indicated that biogas production may be a viable handling strategy for retrieved biomass, while harvesting other types of macroalgae than red filamentous species considered here may render a better energy balance due to higher methane yields.

Place, publisher, year, edition, pages
2014. Vol. 6, no 1, 013116- p.
Keyword [en]
Life-Cycle, Biogas Production, Greenhouse-Gas, Transportation Sector, Exergy Analysis, Common Reed, Net Energy, Efficiency, Biomass, Algae
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:kth:diva-144008DOI: 10.1063/1.4862783ISI: 000332320200032Scopus ID: 2-s2.0-84901831992OAI: oai:DiVA.org:kth-144008DiVA: diva2:710024
Funder
Formas, 229-2009-468
Note

QC 20140404

Available from: 2014-04-04 Created: 2014-04-04 Last updated: 2017-12-05Bibliographically approved
In thesis
1. Sustainability Aspects of Bioenergy and Nutrient Recovery from Marine Biomass: Baltic Sea case studies
Open this publication in new window or tab >>Sustainability Aspects of Bioenergy and Nutrient Recovery from Marine Biomass: Baltic Sea case studies
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Coastal areas around the world are experiencing environmental problems such as climate change and eutrophication. These, in turn, lead to emerging challenges with excessive amounts of biomass that impact coastal communities. Developing utilisation strategies for marine biomass is therefore highly relevant and forms part of the blue growth research field. In response to environmental concerns, as a waste management strategy and as part of blue growth research initiatives, several Baltic Sea coastal projects have been initiated in recent years to study utilisation of maritime biomass. However, the sustainability of these utilisation strategies has not been critically appraised. Therefore, the work presented in this thesis explored some key sustainability aspects of two Baltic Sea case studies utilising common reed (Kalmar, Sweden) and mass-occurring filamentous macroalgae (Trelleborg, Sweden) for biogas and biofertiliser recovery. Energy analyses suggested that both case studies could provide a positive energy balance and have the potential to achieve nutrient recovery. Moreover, a contingent valuation study in Trelleborg demonstrated considerable welfare benefits of biomass utilisation. These findings indicate that marine biomass utilisation strategies highlight potential to contribute to environmental and welfare benefits of these coastal communities.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. xii, 57 p.
Series
TRITA-IM, ISSN 1402-7615 ; 2014:03
National Category
Environmental Sciences
Research subject
Industrial Ecology
Identifiers
urn:nbn:se:kth:diva-156377 (URN)978-91-7595-365-6 (ISBN)
Public defence
2014-12-18, F3, Lindstedtsvägen 26, KTH, Stockholm, 09:00 (English)
Opponent
Supervisors
Funder
Formas, Grant number 229-2009-468
Note

QC 20141126

Available from: 2014-11-26 Created: 2014-11-26 Last updated: 2014-12-02Bibliographically approved

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Gröndahl, FredrikMalmström, Maria E.

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