Identifying a marine microalgae with high carbohydrate productivities under stress and potential for efficient flocculation

Mayers, Joshua J.; Vaičiulytė, Sigita; Malmhäll-Bah, Eric; Alcaide-Sancho, Javier; Ewald, Stefanie; Godhe, Anna; Ekendahl, Susanne; Albers, Eva

doi:10.1016/j.algal.2018.02.034

Cited by 41 publications

(17 citation statements)

References 71 publications

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“…A presença de baixos nutrientes em T-0 pode ter reduzido a síntese lipídica. Para Mayers et al [24], o menor teor de proteína em ambos os tratamentos está associado ao acúmulo de carboidratos devido à capacidade de manter a fixação de carbono sob estresse severo. Por outro lado, se houver alguma limitação de nitrogênio a Spirulina sp.…”

Section: Resultsunclassified

PRODUÇÃO DE Spirulina sp. (LEB18) COM ELEVADOS TEORES DE PROTEÍNA E FICOCIANINA, UTILIZANDO ÁGUA RESIDUAL DA AQUICULTURA

Silva¹,

Cardoso²,

Duarte³

et al. 2019

Blucher Engineering Proceedings

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Resumo: O objetivo foi produzir biomassa de Spirulina sp. (LEB 18) utilizando água residual da aquicultura como meio alternativo e avaliar a composição da biomassa. Os cultivos foram realizados em fotobiorreatores (1L) com 100% de água residual de aquicultura suplementada com T-25, T-50, T-75. O tratamento T-25 apresentou maiores valores de proteína (65,73%) e ficocianina (16,60 mg/mL). Assim, o tratamento com 25% representa uma alternativa eficiente, barata e sustentável para o setor de aquicultura, produzindo biomassa de baixo custo com características diferenciadas e alto valor agregado.

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Section: Resultsunclassified

PRODUÇÃO DE Spirulina sp. (LEB18) COM ELEVADOS TEORES DE PROTEÍNA E FICOCIANINA, UTILIZANDO ÁGUA RESIDUAL DA AQUICULTURA

Silva¹,

Cardoso²,

Duarte³

et al. 2019

Blucher Engineering Proceedings

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“…Production of biomass for use in bench-scale flocculation and sedimentation experiments was done using 1 L bottles as described previously (Mayers et al, 2018). Cultures were sub-cultured on a weekly basis to maintain rapid growth.…”

Section: Bench-scale Experimentsmentioning

confidence: 99%

“…Biochemical composition was determined for the two types of harvested biomass and original biomass generated during the pilot scale trial. Protein and carbohydrates were measured as described (Mayers et al, 2018). Ash was determined by combusting a known volume of freeze-dried biomass at 550°C for 3 h in pre-weighed and pre-combusted crucibles.…”

Section: Biochemical Determinationmentioning

confidence: 99%

“…However, in this instance, it appears that a base concentration of 8 mM NaOH and an Mg 2+ concentration between 6 and 10 mM are sufficient to achieve maximum flocculation at all the biomass concentrations tested. These experiments used media containing no additional Mg 2+ ; freshwater algal media typically contain ≤0.4 mM Mg 2+ (Andersen, 2005), so additional Mg is certainly required to achieve high levels of flocculation, whereas in seawater media (~50 mM Mg 2+ ) this is not the case (Mayers et al, 2018).…”

Section: Effect Of Biomass Concentration On Alkaline and Mg Flocculation Efficiencymentioning

confidence: 99%

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An energy and resource efficient alkaline flocculation and sedimentation process for harvesting of Chromochloris zofingiensis biomass

Mayers

Landels

Allen

et al. 2020

Bioresource Technology Reports

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Harvesting microalgal cultures is often energetically intensive and costly. To improve efficiencies, a two-step harvesting method utilising alkaline flocculation and sedimentation to pre-concentrate cultures can be used prior to centrifugation. When applied to the microalga Chromochloris zofingiensis, high rates of sedimentation (> 90%) were found at low concentrations of base (< 10 mM), with the addition of magnesium to the media (via NaOH/ MgSO 4 or Ca(OH) 2 /Mg(OH) 2 ) to form Mg(OH) 2 . The process was scaled to 180 L, where sedimentation was as efficient as that achieved at bench scale. Characterisation of the harvested biomass showed comparable composition (following neutralisation of pH) to biomass recovered solely by centrifugation. The alternative two-step processes were assessed for environmental impacts and cost, which indicated that a two-step harvesting generally performs better than centrifugation alone, but that the locally available electricity source is a critical parameter for optimal solution.

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“…In our study, a very high occulation e ciency (98.8 ± 1.3 %) was reported for occulating marine microalgae. Marine microalgae are also utilized to biore ning, because the biomass can be used to produce higher value products, such as astaxanthin and phycocyanin (Mayers et al 2018). The astaxanthin and phycocyanin was $110/kg and $180/kg (http://www.alibaba.com).…”

Section: Comprehensive Comparison Of the Three Occulantsmentioning

confidence: 99%

Using Ferric Sulfate, Sodium Hydroxide, and Chitosan to Harvest Marine Microalgae Chlorella Vulgaris and Recycling the Culture Medium

et al. 2020

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Microalgae are widely used in biofuels, medicine, food, and feed industries. However, harvesting microalgal biomass is a major di culty that hinders their industrial application. In this study, three occulants (ferric sulfate, sodium hydroxide, and chitosan) were used to harvest the marine microalga Chlorella vulgaris, and oc characteristics including occulation e ciency, concentration factor, and ocs morphology were studied. The results showed that the tested occulants can e ciently harvest C. vulgaris. The occulation e ciencies of ferric sulfate (0.9 g/L), sodium hydroxide (0.6 g/L), and chitosan (30 mg/L) were 93.4% ± 0.8%, 96.5% ± 0.6%, and 98.8% ± 1.3% within 70, 100, and 12 min, respectively. The total carbohydrates, proteins, and lipids contents in C. vulgaris were not in uenced by the test occulants after harvesting. When compared with fresh f/2 medium, the recycled medium could also e ciently support C. vulgaris growth. Among the three occulants tested, chitosan was ideal owing to its high e ciency, low dosage requirement, short harvesting time, and reutilization of culture medium.

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Identifying a marine microalgae with high carbohydrate productivities under stress and potential for efficient flocculation

Cited by 41 publications

References 71 publications

PRODUÇÃO DE Spirulina sp. (LEB18) COM ELEVADOS TEORES DE PROTEÍNA E FICOCIANINA, UTILIZANDO ÁGUA RESIDUAL DA AQUICULTURA

PRODUÇÃO DE Spirulina sp. (LEB18) COM ELEVADOS TEORES DE PROTEÍNA E FICOCIANINA, UTILIZANDO ÁGUA RESIDUAL DA AQUICULTURA

An energy and resource efficient alkaline flocculation and sedimentation process for harvesting of Chromochloris zofingiensis biomass

Using Ferric Sulfate, Sodium Hydroxide, and Chitosan to Harvest Marine Microalgae Chlorella Vulgaris and Recycling the Culture Medium

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