Functional Diversity Facilitates Stability Under Environmental Changes in an Outdoor Microalgal Cultivation System

Mattsson, Lina; Sörenson, Eva; Capo, Eric; Farnelid, Hanna; Hirwa, Maurice; Olofsson, Martin; Svensson, Fredrik; Lindehoff, Elin; Legrand, Catherine

doi:10.3389/fbioe.2021.651895

Cited by 15 publications

(6 citation statements)

References 70 publications

(95 reference statements)

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“…A brackish microalgal polyculture was collected from an operational outdoor photobioreactor (GWPII system, Fotosintetica & Microbiologica S.r.l, Italy) run by the research project ALGOLAND, Linnaeus University, in collaboration with CementaAB, Degerhamn, SE Sweden (N 56° 35.2707, E 16° 40.7902) (Mattsson et al, 2021). The photobioreactor was inoculated with the Baltic Sea microalgal community in 2014 and maintained over several years.…”

Section: Methodsmentioning

confidence: 99%

Whey permeate as a phosphorus source for algal cultivation

Nham

Mattsson

Legrand

et al. 2023

Water Environment Research

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Microalgal cultivation for biodiesel and feed requires recycled nutrient resources for a sustainable long‐term operation. Whey permeate (WP) from dairy processing contains high organic load (lactose, oils, and proteins) and nitrogen (resources tested for microalgal cultivation) and organic phosphorus (P) that has not yet been tested as a P source for microalgal cultivation. We explored the potential of green algae strains (brackish) and polyculture (freshwater) in exploiting P from WP added to a medium based on either seawater (7 psu) or landfill leachate. Both strains showed a capacity of using organic P in WP with equal growth rates (0.94–1.12 d−1) compared with chemical phosphate treatments (0.88–1.07 d−1). The polyculture had comparable growth rate (0.25–0.57 d−1) and biomass yield (152.1–357.5 mg L−1) and similar or higher nutrient removal rate in the leachate–WP medium (1.3–6.4 mg L−1 day−1 nitrogen, 0.2–1.1 mg L−1 day−1 P) compared with the leachate–chemical phosphate medium (1.2–4.7 mg L−1 day−1 nitrogen, 0.3–1.4 mg L−1 day−1 P). This study showed that WP is a suitable P source for microalgal cultivation over a range of salinities. To date, this is the first study demonstrating that raw WP can replace mineral P fertilizer for algal cultivation. Practitioners Points Whey permeate is a comparable phosphorus source to standard fertilizers used in algal cultivation. Green algae removed phosphorus effectively from whey permeate. Microalgal cultivation is a good approach for treatment of whey permeate in combination with a nitrogen‐rich wastewater.

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Section: Methodsmentioning

confidence: 99%

Whey permeate as a phosphorus source for algal cultivation

Nham

Mattsson

Legrand

et al. 2023

Water Environment Research

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“…Of particular interest in this regard is mixed culture or non-axenic phototrophic biofilms, which naturally comprise a diverse range of organisms including both photoautotrophic microalgae and heterotrophic bacteria (Miranda et al, 2017;Roeselers et al, 2008). This diversity leads to functional redundancy and beneficial interactions among community members which serves to enhance productivity and improve robustness (Mattsson et al, 2021), enabling the culture to thrive within a wider range of growth conditions and reducing the risk of culture collapse due to contamination or environmental stressors (Gonçalves et al, 2017;Kazamia et al, 2014). To take advantage of this, there is impetus to explore an approach to algal biotechnology focused on managing the environment to select for, and exploit, natural biofilm ecosystems and their intrinsic ecological and physiological advantages (Ramanan et al, 2016;Tenore et al, 2021).…”

Section: Motivation For the Researchmentioning

confidence: 99%

“…Diversity in phototrophic biofilms promotes biomass productivity and enhances robustness compared to monocultures (Gonçalves et al, 2017;Mattsson et al, 2021;Kazamia et al, 2014), enabling these biofilms to persist within a wider range of environmental conditions while being less susceptible to collapse caused by contamination (Sharp et al, 2017). In microalgal cultivation, therefore, it will be beneficial to explore an approach focussed on creating and managing an environment to select for desired species interactions and whole-biofilm functions (Kazamia et al, 2014;Ronan et al, 2021).…”

Section: Algae-bacteria Interactions Within Phototrophic Biofilmsmentioning

confidence: 99%

Investigation and Optimization of CO2 Uptake

Ronan

2024

Preprint

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Climate change caused by the accumulation of CO2 in the atmosphere has emphasized the need for effective CO2 mitigation strategies. Microalgae are fast-growing photoautotrophic microorganisms that use light energy to take up and fix CO2, producing biomass with inherent value and applicability in fields like agriculture, nutrition, and bioenergy. The fact that wastewater can be used to support microalgal growth presents the opportunity to achieve the “triple benefit” of integrated CO2 capture, wastewater remediation, and value-added biomass production. While microalgal cultivation has conventionally utilized monocultures growing in suspension, microalgae in nature largely exhibit sessile growth in mixed-species biofilms with close associations to other microorganisms. Considering one of the tenets of microbial community ecology is that species diversity promotes productivity, the use of mixed, non-axenic phototrophic biofilms in algal biotechnologies can present a new paradigm which harnesses natural phototrophic microbial ecosystems and the ecological and physiological advantages that they offer. The research presented herein set out to expand our understanding of mixed phototrophic biofilms. A key interest was the CO2 uptake performance of these biofilms under conditions that are relevant for the integration of CO2 mitigation, wastewater treatment, and biomass production via photosynthetic growth. A novel CO2 sequestration monitoring system (CSMS) was developed to track real-time CO2 uptake by phototrophic biofilms, which demonstrated good sensitivity in detecting changes in uptake rate brought about by varying environmental and cultivation conditions. It was also shown that the presence and concentration of organic carbon sources significantly impacted biofilm carbon capture and led to observable longitudinal partitioning of heterotrophic and autotrophic growth. The system was further used to evaluate the impact of nitrogen starvation, a common algal biomass optimization strategy, on biofilm CO2 uptake. Starvation appeared to promote sloughing of biofilm biomass and coincided with a steady, near linear decrease in CO2 uptake rate. These insights contribute to an improved understanding of phototrophic biofilms and represent an important step toward large-scale biofilm-based CO2 mitigation.

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“…Microalgal consortia have the potential to offer crop protection and increase the stability of yields (Smith et al, 2010;Newby et al, 2016;Mattsson et al, 2021). The use of consortia makes the biorefinery process more complex for extracting any species-specific product, however, managing microbial consortia could be a viable industrial practice for biofuel with higher productivity and stability.…”

Section: Sustainable Cultivation Practicesmentioning

confidence: 99%

Integration of Algal Biofuels With Bioremediation Coupled Industrial Commodities Towards Cost-Effectiveness

et al. 2021

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Microalgae offer a great potential to contribute significantly as renewable fuels and documented as a promising platform for algae-based bio refineries. They provide solutions to mitigate the environmental concerns posed by conventional fuel sources; however, the production of microalgal biofuels in large scale production system encounters few technical challenges. High quantity of nutrients requirements and water cost constrain the scaling up microalgal biomass to large scale commercial production. Crop protection against biomass losses due to grazers or pathogens is another stumbling block in microalgal field cultivation. With our existing technologies, unless coupled with high-value or mid-value products, algal biofuel cannot reach the economic target. Many microalgal industries that started targeting biofuel in the last decade had now adopted parallel business plans focusing on algae by-products application as cosmetic supplements, nutraceuticals, oils, natural color, and animal feed. This review provides the current status and proposes a framework for key supply demand, challenges for cost-effective and sustainable use of water and nutrient. Emphasis is placed on the future industrial market status of value added by products of microalgal biomass. The cost factor for biorefinery process development needs to be addressed before its potential to be exploited for various value-added products with algal biofuel.

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Functional Diversity Facilitates Stability Under Environmental Changes in an Outdoor Microalgal Cultivation System

Cited by 15 publications

References 70 publications

Whey permeate as a phosphorus source for algal cultivation

Whey permeate as a phosphorus source for algal cultivation

Investigation and Optimization of CO2 Uptake

Integration of Algal Biofuels With Bioremediation Coupled Industrial Commodities Towards Cost-Effectiveness

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