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Olofsson, Martin
Publications (10 of 17) Show all publications
Lindehoff, E., Mattsson, L., Olofsson, M., Svensson, F., Farnelid, H. & Legrand, C. (2024). Biomass performance and stability of 5-year outdoor microalgal cultivation for CO2 removal from cement flue gas. Bioresource Technology Reports, 25, Article ID 101730.
Open this publication in new window or tab >>Biomass performance and stability of 5-year outdoor microalgal cultivation for CO2 removal from cement flue gas
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2024 (English)In: Bioresource Technology Reports, E-ISSN 2589-014X, Vol. 25, article id 101730Article in journal (Refereed) Published
Abstract [en]

The study evaluated removal of industrial CO2 from cement flue gas using algal cultivation. Local polycultures were grown in an up-scaled outdoor photobioreactor over 5 years in northern Europe. Algal biomass was harvested 2–3 times per week and the closed panel system was re-filled with seawater amended with nutrients. Flue gas was fed to the photobioreactor circulatory system in one direction or re-circulated. Removal efficiency of CO2 averaged 9 % in non-recirculation and 17 % in re-circulation modes and reached 20–60 % under best cultivation conditions. Recovery of carbon into algal biomass reached up to 10 g m2d−1 in non-recirculation mode. Biomass performance was explained by circulation mode and shift of polyculture traits. Stability of biomass quality was shown over seasons, with higher relative content of protein in autumn. Toxic elements in biomass were below legal thresholds for upcycling. The study shows feasibility of algal solutions for conversion of waste, applied in temperate climate.

Place, publisher, year, edition, pages
Elsevier, 2024
National Category
Bioenergy
Research subject
Ecology, Aquatic Ecology
Identifiers
urn:nbn:se:lnu:diva-128656 (URN)10.1016/j.biteb.2023.101730 (DOI)001299481200001 ()2-s2.0-85179891879 (Scopus ID)
Available from: 2024-04-08 Created: 2024-04-08 Last updated: 2025-03-31Bibliographically approved
Mattsson, L., Farnelid, H., Hirwa, M., Olofsson, M., Svensson, F., Legrand, C. & Lindehoff, E. (2024). Seasonal nitrogen removal in an outdoor microalgal polyculture at Nordic conditions. Water environment research, 96(10), Article ID e11142.
Open this publication in new window or tab >>Seasonal nitrogen removal in an outdoor microalgal polyculture at Nordic conditions
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2024 (English)In: Water environment research, ISSN 1061-4303, E-ISSN 1554-7531, Vol. 96, no 10, article id e11142Article in journal (Refereed) Published
Abstract [en]

Microalgal solutions to clean waste streams and produce biomass were evaluated in Nordic conditions during winter, spring, and autumn in Southeast Sweden. The study investigated nitrogen (N) removal, biomass quality, and safety by treating industrial leachate water with a polyculture of local microalgae and bacteria in open raceway ponds, supplied with industrial CO2 effluent. Total N (TN) removal was higher in spring (1.5 g-2d-1), due to beneficial light conditions compared to winter and autumn (0.1 and 0.09 g-2d-1). Light, TN, and N species influenced the microalgal community (dominated by Chlorophyta), while the bacterial community remained stable throughout seasons with a large proportion of cyanobacteria. Winter conditions promoted biomass protein (19.6-26.7%) whereas lipids and carbohydrates were highest during spring (11.4-18.4 and 15.4-19.8%). Biomass toxin and metal content were below safety levels for fodder, but due to the potential presence of toxic strains, biofuels or fertilizer could be suitable applications for the algal biomass.Practitioner points Microalgal removal of nitrogen from leachate water was evaluated in Nordic conditions during winter, spring, and autumn. Total nitrogen removal was highest in spring (1.5 g-2d-1), due to beneficial light conditions for autotrophic growth. Use of local polyculture made the cultivation more stable on a seasonal (light) and short-term (N-species changes) scale. Toxic elements in produced algal biomass were below legal thresholds for upcycling. The study investigated nitrogen removal, biomass quality, and safety by treating industrial leachate water with a polyculture of local microalgae and bacteria in open raceway ponds, supplied with industrial CO2 effluent. Nitrogen removal by the polyculture was highest in spring and the biomass biochemical composition changed with season. image

Place, publisher, year, edition, pages
John Wiley & Sons, 2024
Keywords
leachate water, microalgae, nitrogen removal, outdoor cultivation, polyculture
National Category
Environmental Sciences
Research subject
Natural Science, Environmental Science
Identifiers
urn:nbn:se:lnu:diva-133136 (URN)10.1002/wer.11142 (DOI)001332605200001 ()39415406 (PubMedID)2-s2.0-85206614149 (Scopus ID)
Available from: 2024-10-28 Created: 2024-10-28 Last updated: 2025-04-10Bibliographically approved
Mattsson, L., Lindehoff, E., Olofsson, M. & Legrand, C. (2019). Boosting algal lipids: Diurnal shifts in temperature exceed the effects of nitrogen limitation. Engineering Reports, 1(5), 1-13, Article ID e12067.
Open this publication in new window or tab >>Boosting algal lipids: Diurnal shifts in temperature exceed the effects of nitrogen limitation
2019 (English)In: Engineering Reports, E-ISSN 2577-8196, Vol. 1, no 5, p. 1-13, article id e12067Article in journal (Refereed) Published
Abstract [en]

Algal lipids have been observed to increase during autumn conditions (low light, low mean temperature, and diurnal shift in temperature), in large‐scale outdoor photobioreactors. In this paper, we tested the effect of diurnal shifts in temperature (DS) and nitrogen (N) limitation on algal BODIPY lipid fluorescence cell−1 (BPF). We show that DS increased BPF in algal biomass up to 28% more compared with N limitation, the standard stressor to boost neutral lipids (NL) in commercial production. Biomass yield was constant, regardless the DS range (6°C‐12°C). A combination of both stressors had an additive effect on algal BPF. A polyculture from an outdoor photobioreactor was cultivated under controlled conditions at different regimes of light, temperature, and N limitation. DSs were mimicking autumn conditions with a difference of 6°C, 10°C, and 12°C between day and night. Biomass and BPF were monitored over one to two weeks, and NLs were stained with a fluorescent marker (BODIPY) and detected with flow cytometry. Results indicate that, during autumn conditions, daily heating and cooling processes in contrast to N limitation do not challenge the trade‐off between biomass production and BPF. During seasons when day temperature is still relatively high, DSs are rapid BPF boosting stressors, while N limitation could be applied to boost BPF further during other seasons.

Place, publisher, year, edition, pages
John Wiley & Sons, 2019
National Category
Biological Sciences
Research subject
Ecology, Aquatic Ecology
Identifiers
urn:nbn:se:lnu:diva-91463 (URN)10.1002/eng2.12067 (DOI)000674328500003 ()2-s2.0-85094556076 (Scopus ID)
Available from: 2020-01-31 Created: 2020-01-31 Last updated: 2023-02-09Bibliographically approved
Olofsson, M., Lindehoff, E. & Legrand, C. (2019). Production stability and biomass quality in microalgal cultivation: contribution of community dynamics. Engineering in Life Sciences, 19(5), 330-340
Open this publication in new window or tab >>Production stability and biomass quality in microalgal cultivation: contribution of community dynamics
2019 (English)In: Engineering in Life Sciences, ISSN 1618-0240, E-ISSN 1618-2863, Vol. 19, no 5, p. 330-340Article in journal (Refereed) Published
Abstract [en]

The prospect of using constructed communities of microalgae in algal cultivation wasconfirmed in this study. Three constructed communities of diatoms (Diatom), greenalgae (Green) and cyanobacteria (Cyano), were each mixed with a natural communityof microalgae as baseline. The communities were cultivated in batch and semicontinuousmode and fed CO2 or cement flue gas (12-15 % CO2). Diatom had thehighest growth rate but Green had the highest yield. Dynamic changes in thecommunity composition occurred from start through batch to semi-steady state. Greenalgae were the most competitive group during the experiment. Euglenoids wererecruited from scarce species in the natural community and became a large part of thebiomass in semi-steady state in all communities. High temporal and yield stabilitywas demonstrated in all communities during semi-steady state. Biochemicalcomposition (lipids, proteins and carbohydrates) was similar for the threecommunities with lipids ranging 14-26 % of dry weight (DW), proteins (15-28 %DW) and carbohydrates (9-23 % DW). Filamentous cyanobacteria were outcompetedearly in the experiment. However, their minute presence in Cyano associated withhigher lipid and lower carbohydrates compared to Diatom and Green, suggesting theimportance of chemical interactions among microorganisms. Our results indicate thatculture functions (stability, biomass quality) were maintained while dynamic changesoccurred in community composition. We propose that a multi-species communityapproach can aid sustainability in microalgal cultivation, through complementary useof resources and higher culture stability. Local environmental conditions,complementary microalgal traits, and interactions among functional groups (algae,bacteria) should be considered in community design where natural succession andcrop rotation will likely provide stability for commercial-scale algal cultivation.

Place, publisher, year, edition, pages
Hoboken, NJ: John Wiley & Sons, 2019
Keywords
Microalgae, multi-species communities, production stability, algal cultivation, biomass composition, flue gas
National Category
Biological Sciences Ecology
Research subject
Ecology, Aquatic Ecology; Chemistry, Biotechnology; Environmental Science, Environmental technology
Identifiers
urn:nbn:se:lnu:diva-46511 (URN)10.1002/elsc.201900015 (DOI)000472189900001 ()2-s2.0-85063427279 (Scopus ID)
Available from: 2015-09-28 Created: 2015-09-28 Last updated: 2025-05-23Bibliographically approved
Lindehoff, E. & Olofsson, M. (2018). ALGOLAND – Recovery: avfall används för att producera en värdefull produkt - algbiomassa. In: Presented at the Algoland 2030 Workshop, Kalmar, Sweden, April 24, 2018: . Paper presented at Algoland 2030 Workshop, Kalmar, Sweden, April 24, 2018.
Open this publication in new window or tab >>ALGOLAND – Recovery: avfall används för att producera en värdefull produkt - algbiomassa
2018 (Swedish)In: Presented at the Algoland 2030 Workshop, Kalmar, Sweden, April 24, 2018, 2018Conference paper, Oral presentation only (Other academic)
National Category
Ecology
Research subject
Ecology, Aquatic Ecology
Identifiers
urn:nbn:se:lnu:diva-73785 (URN)
Conference
Algoland 2030 Workshop, Kalmar, Sweden, April 24, 2018
Projects
EcochangeAlgoland
Available from: 2018-05-03 Created: 2018-05-03 Last updated: 2025-05-23Bibliographically approved
Olofsson, M. & Legrand, C. (2017). ALGOLAND – Recovery: Avfall används för att producera en värdefull produkt - algbiomassa. In: Linnaeus Technical Centre (LTC) och Linnaeus Innovation Design Lab (Lidlab), May 8th 2017: . Paper presented at Linnaeus Technical Centre (LTC) och Linnaeus Innovation Design Lab (Lidlab), May 8th 2017.
Open this publication in new window or tab >>ALGOLAND – Recovery: Avfall används för att producera en värdefull produkt - algbiomassa
2017 (Swedish)In: Linnaeus Technical Centre (LTC) och Linnaeus Innovation Design Lab (Lidlab), May 8th 2017, 2017Conference paper, Oral presentation only (Other academic)
National Category
Ecology
Research subject
Ecology, Aquatic Ecology
Identifiers
urn:nbn:se:lnu:diva-73790 (URN)
Conference
Linnaeus Technical Centre (LTC) och Linnaeus Innovation Design Lab (Lidlab), May 8th 2017
Projects
EcoChangeAlgoland
Note

Ej belagd 20180504

Available from: 2018-05-03 Created: 2018-05-03 Last updated: 2021-05-05Bibliographically approved
Olofsson, M. (2017). Baltic Sea Future: Algoland. In: : . Paper presented at Baltic Sea Future: Stockholmsmässan 2017.
Open this publication in new window or tab >>Baltic Sea Future: Algoland
2017 (English)Conference paper, Poster (with or without abstract) (Other (popular science, discussion, etc.))
Keywords
baltic sea, carbon dioxide, nutrient, eutrophication, algae, microalgae, climate change, global warming, industry, collaboration, östersjön, hållbarhet, alger, mikroalger, koldioxid, climate change, global warming, industri, cementa, KSRR, Kalmar Energi, samverkan
National Category
Environmental Sciences Ecology
Research subject
Natural Science, Ecology; Ecology, Aquatic Ecology
Identifiers
urn:nbn:se:lnu:diva-74739 (URN)
Conference
Baltic Sea Future: Stockholmsmässan 2017
Projects
AlgolandEcoChange
Note

Baltic Sea Future, a two-day congress in Stockholm held on the 6-7 March 2017.Baltic Sea Future will address the challenges in the Baltic Sea region, focusing on the key role of municipalities. The Baltic Sea is loved, needed and polluted, and municipalities are the hubs who can coordinate interests, engage local citizens, turn scientific results into action, and handle the challenges to create a sustainable future for the Baltic Sea.

http://www.balticseafuture.org/

Ej belagd 20180720

Available from: 2018-05-30 Created: 2018-05-30 Last updated: 2018-07-20Bibliographically approved
Rathi, A. (2017). The revolutionary technology pushing Sweden toward the seemingly impossible goal of zero emissions: The cure for emissions: algae. Quartz (21 June)
Open this publication in new window or tab >>The revolutionary technology pushing Sweden toward the seemingly impossible goal of zero emissions: The cure for emissions: algae
2017 (English)In: Quartz, no 21 JuneArticle in journal, News item (Other (popular science, discussion, etc.)) Published
Keywords
mpea, ecochange, algoland
National Category
Natural Sciences Environmental Sciences Climate Science Ecology
Research subject
Ecology, Aquatic Ecology
Identifiers
urn:nbn:se:lnu:diva-73782 (URN)
Projects
ecochangealgoland
Available from: 2018-05-03 Created: 2018-05-03 Last updated: 2025-02-01Bibliographically approved
Olofsson, M., Lindehoff, E., Frick, B., Svensson, F. & Legrand, C. (2015). Baltic Sea microalgae transform cement flue gas into valuable biomass. Algal Research, 11, 227-233
Open this publication in new window or tab >>Baltic Sea microalgae transform cement flue gas into valuable biomass
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2015 (English)In: Algal Research, ISSN 2211-9264, Vol. 11, p. 227-233Article in journal (Refereed) Published
Abstract [en]

We show high feasibility of using cement industrial flue gas as CO2 source for microalgal cultivation. The toxicity of cement flue gas (12-15% CO2) on algal biomass production and composition (lipids, proteins, carbohydrates) was tested using monocultures (Tetraselmis sp., green algae, Skeletonema marinoi, diatom) and natural brackish communities. The performance of a natural microalgal community dominated by spring diatoms was compared to a highly productive diatom monoculture S. marinoi fed with flue gas or air-CO2 mixture. Flue gas was not toxic to any of the microalgae tested. Instead we show high quality of microalgal biomass (lipids 20-30% DW, proteins 20-28% DW, carbohydrates 15-30% DW) and high production when cultivated with flue gas addition compared to CO2-air. Brackish Baltic Sea microalgal communities performed equally or better in terms of biomass quality and production than documented monocultures of diatom and green algae, often used in algal research and development. Hence, we conclude that microalgae should be included in biological solutions to transform waste into renewable resources in coastal waters. (C) 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Place, publisher, year, edition, pages
Elsevier, 2015
Keywords
Microalgae, Baltic Sea, Flue gas, Biomass composition, Natural communities, Brackish
National Category
Microbiology Bioenergy Bioremediation
Research subject
Ecology, Aquatic Ecology
Identifiers
urn:nbn:se:lnu:diva-45559 (URN)10.1016/j.algal.2015.07.001 (DOI)000363046900029 ()2-s2.0-84943643090 (Scopus ID)
Projects
Algoland
Funder
Knowledge Foundation
Available from: 2015-07-25 Created: 2015-07-25 Last updated: 2025-05-23Bibliographically approved
Olofsson, M. (2015). Microalgae: future bioresource of the sea?. (Doctoral dissertation). Växjö: Linnaeus University Press
Open this publication in new window or tab >>Microalgae: future bioresource of the sea?
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Unicellular microalgae are a renewable bioresource that can meet the challenge forfood and energy in a growing world population. Using sunlight, CO2, nutrients,and water, algal cells produce biomass in the form of sugars, proteins and oils, allof which carry commercial value as food, feed and bioenergy. Flue gas CO2 andwastewater nutrients are inexpensive sources of carbon and fertilizers. Microalgaecan mitigate CO2 emissions and reduce nutrients from waste streams whileproducing valuable biomass.My focus was on some of the challenging aspects of cultivating microalgae ascrop: the response of biomass production and quality to seasonality, nutrients andbiological interactions. Approach spans from laboratory experiments to large-scaleoutdoor cultivation, using single microalgal strains and natural communities insouthern (Portugal) and northern (Sweden) Europe.Half of the seasonal variation in algal oil content was due to changes in light andtemperature in outdoor large-scale cultures of a commercial strain (Nannochloropsisoculata). Seasonal changes also influence algal oil composition with more neutrallipids stored in cells during high light and temperature. Nitrogen (N) stress usuallyenhances lipid storage but suppresses biomass production. Our manipulationshowed that N stress produced more lipids while retaining biomass. Thus,projecting annual biomass and oil yields requires accounting for both seasonalchanges and N stress to optimize lipid production in commercial applications.Baltic Sea microalgae proved to be a potential biological solution to reduce CO2emissions from cement flue gas with valuable biomass production. A multi-speciescultivation approach rather than single-species revealed that natural or constructedcommunities of microalgae can produce equivalent biomass quality. Diversecommunities of microalgae can offer resilience and stability due to more efficientresource utilization with less risk of contamination, less work and cost for culturemaintenance.Stable algal biomass production (annual basis) was achieved in outdoor pilot-scale(1600 L) cultivation of Baltic Sea natural communities using cement flue gas as aCO2 source. Results indicate favorable algal oil content at northern Europeanlatitudes compared to southern European latitudes.My thesis establishes the potential of cultivating microalgae as a bioresource inScandinavia, and using a community approach may be one step towardssustainable algal technology.

Place, publisher, year, edition, pages
Växjö: Linnaeus University Press, 2015
Series
Linnaeus University Dissertations ; 227/2015
Keywords
Microalgae, algal cultivation, bioresource, bioenergy, CO2 mitigation, multi-species community approach, seasonal variation
National Category
Biological Sciences Ecology Industrial Biotechnology
Research subject
Ecology, Aquatic Ecology; Chemistry, Biotechnology; Environmental Science, Environmental technology
Identifiers
urn:nbn:se:lnu:diva-46512 (URN)9789187925757 (ISBN)
Public defence
2015-10-16, Hörsalen Fullriggaren, Landgången 4, Kalmar, 09:30 (English)
Opponent
Supervisors
Projects
AlgolandEcoChange
Available from: 2015-09-28 Created: 2015-09-28 Last updated: 2025-02-03Bibliographically approved
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