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Energy Analysis of the Nannochloropsis sp. Production as an Alternative Protein Source using the Holistic ep-EROI
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.ORCID iD: 0000-0003-4181-0571
Faculty of Biosciences, Fisheries and Economics, The Arctic University of Norway, 9037 Tromsø, Norway.
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.ORCID iD: 0000-0002-4530-3414
State Key Laboratory of Clean Energy Utilization, Zhejiang University, 310027 Hangzhou, PR China.
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

Energy systems analysis and greenhouse gas (GHG) emissions of open pond microalgae cultivation systems is attracting considerable interest in the past decade due to their potentials for the production of biofuels and phytochemicals. However, there has been little discussion on energy systems analysis of microalgae produced from power plant flue gas and its use as an alternative protein source. This study aims to analyze edible protein energy return on investment (ep-EROI) and the overall GHG emissions for a medium-to-large scale Nannochloropsis oceanica cultivation system using power plant flue gas in northern China. Besides, additional benefits of the microalgae cultivation system were assessed on the overall nutrient recovery potential of the harvested biomass. Results of the study indicated that cumulative energy demand and GHG emissions for production of Nannochloropsis oceanica products were intermediate to other conventional protein sources in the literature, such as fish. Results of the EROI-based analysis showed that the Nannochloropsis oceanica cultivation system achieved a moderate ep-EROI of 0.11.

National Category
Environmental Sciences
Research subject
Industrial Ecology
Identifiers
URN: urn:nbn:se:kth:diva-261360OAI: oai:DiVA.org:kth-261360DiVA, id: diva2:1357752
Note

QC 20191004

Available from: 2019-10-04 Created: 2019-10-04 Last updated: 2019-10-04Bibliographically approved
In thesis
1. Nutrient Recovery as an Added Benefit to Harvests of Photosynthetic Marine Biomass: A Holistic Systems Perspective on Harvesting Marine Microalgae, Cyanobacteria, and Macroalgae
Open this publication in new window or tab >>Nutrient Recovery as an Added Benefit to Harvests of Photosynthetic Marine Biomass: A Holistic Systems Perspective on Harvesting Marine Microalgae, Cyanobacteria, and Macroalgae
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

As a result of increasing environmental burdens from anthropogenic activities andresource scarcity, interest for the development of solutions utilizing photosyntheticmarine biomass has also been increasing in both academia and industries. Medium tolarge scale production and harvest of photosynthetic marine biomass have beenpracticed to achieve numerous services, including improving tourism industries,production of biofuels, and production of food/feed. However, few studies haveevaluated the potential for nutrient recovery as an added benefit to the aforementionedservices and the potential environmental burdens of such solutions from a holisticsystems perspective. This thesis, therefore, sought to determine the nutrient recoverypotential of harvesting photosynthetic marine biomass at industrial scales whileassessing the environmental burdens from a holistic systems perspective. Techniquesinvolving life cycle inventory and analysis, input-output analysis, growth modellingand experimentation, energy analysis, and assessment of greenhouse gas emissionsfrom a life cycle perspective were used to assess the potential environmental burdensof large scale harvest of photosynthetic marine biomass.This study employed five real world case studies of five different photosynthetic marinebiomass species at various geographical locations across the globe. Each case wasassessed to determine the potential to recover nutrients while evaluating the potentialenvironmental burdens from an energy and greenhouse gas perspective. Each casecontains unique specific details and therefore methods applied were case specific.Results showed that nutrient recovery potential existed in most cases with the exceptionof one case. Cases evaluated for their potential environmental burdens showed thatlarge scale harvest of photosynthetic marine biomass is resource intensive regardless ofspecies but showed mixed results from an energy perspective. The key findings of thisthesis were that a) the potential for nutrient recovery was estimated in both large scalecultivation and large scale wild harvest of photosynthetic marine biomass, b) from anenergy and biomass harvesting perspective, the viability of industrial harvests ofphotosynthetic marine biomass were found for both large scale cultivations and wildharvesting of biomass blooms, and c) scale of operations is an important factor towardsevaluating the environmental performance of photosynthetic marine biomassproduction systems.

Abstract [sv]

Som ett resultat av en ökande miljöbelastning från antropogenaktivitet och knapphet på resurser, så har intresset för utveckling av lösningar medfotosyntetisk marin biomassa också ökat i både akademi och industri. Produktion ochskörd av fotosyntetisk marin biomassa i medelstor till stor skala har praktiserats för attuppnå många tjänster, inklusive förbättring av turistnäringar, produktion avbiodrivmedel och livsmedels- och foderproduktion. Men få studier har utvärderatpotentialen för näringsåtervinning som en extra fördel för de nämnda tjänsterna och denpotentiella miljöbelastningen för sådana lösningar ur ett holistiskt systemperspektiv.Denna avhandling försökte därför fastställa näringsåtervinningspotentialen för skörd avfotosyntetisk marin biomassa på industriell skala, samtidigt som miljöbelastningenbedömdes ur ett systemperspektiv. Tekniker som involverar livscykelinventering ochanalys, input-output-analys, tillväxtmodellering och experiment, energianalys ochutvärdering av växthusgasutsläpp ur ett livscykelperspektiv användes för att bedömaden potentiella miljöbelastningen för storskalig skörd av fotosyntetisk marin biomassa.I denna studie användes fem verkliga fallstudier av fem olika fotosyntetiska marinaarter som kan producerar biomassa på olika geografiska platser över hela världen. Varjefall bedömdes för att bestämma potentialen för att återvinna näringsämnen samtidigtsom den potentiella miljöbelastningen utvärderades ur ett energi- ochväxthusgasperspektiv. Varje fall innehåller unika specifika detaljer och därför användesmetoder som var specifika för varje fallstudie. Resultaten visade att potentialen föråterhämtning av näringsämnen fanns i de flesta fall med undantag för ett fall. Fall somutvärderades för deras potentiella miljöbelastningar visade att storskalig skörd avfotosyntetisk marin biomassa är resurskrävande oavsett art men visade blandaderesultat ur energiperspektiv. De viktigaste resultaten från denna avhandling var att a)potentialen för näringsåtervinning uppskattades i både storskalig odling och storskaligvild skörd av fotosyntetisk marin biomassa, b) möjligheten för industriell skörd avfotosyntetisk marin biomassa hittades för både storskalig odling och vild skörd avbiomassa, och c) skalan är en viktig faktor för att utvärdera miljöprestanda förfotosyntetiska marina system för biomassaproduktion.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2019. p. 43
National Category
Environmental Sciences
Research subject
Industrial Ecology
Identifiers
urn:nbn:se:kth:diva-261367 (URN)978-91-7873-254-8 (ISBN)
Public defence
2019-10-28, F3, Lindstedtsvägen 26, Stockholm, 14:00 (English)
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Supervisors
Note

QC 20191008

Available from: 2019-10-08 Created: 2019-10-04 Last updated: 2019-10-08Bibliographically approved

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Pechsiri, Joseph SanthiMalmström, MariaGröndahl, Fredrik

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