Sustainable saline microalgae co-cultivation for biofuel production: A critical review

Ishika, Tasneema; Moheimani, Navid R.; Bahri, Parisa A.

doi:10.1016/j.rser.2017.04.110

Cited by 101 publications

(47 citation statements)

References 172 publications

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“…The broad salinity tolerance of this strain offers flexibility in mass cultivation, where saline or brackish water could be used to help reduce the freshwater footprint linked to microalgae cultivation (Guieysse et al 2013). Furthermore, the tolerance to salinity variation may also help to avoid significant decreases in outdoor productivity or culture collapse caused by evaporation or rainfall (Ishika et al 2017).…”

Section: Salinity Tolerance Of Koliella Antarcticamentioning

confidence: 99%

Growth and LC-PUFA production of the cold-adapted microalga Koliella antarctica in photobioreactors

et al. 2018

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Microalgae are excellent sources of polyunsaturated fatty acids (PUFAs), but only a few species have been thoroughly investigated in controlled photobioreactor conditions. In this work, the cold-adapted microalga Koliella antarctica (Trebouxiophyceae) was cultivated at 15°C to optimize growth and PUFA production in bubble-tube and flat-plate photobioreactors. The impact of nitrogen starvation, phosphorus starvation, salinity, and light intensity on the growth, fatty acid, and protein content was investigated. After culture optimization, a maximum biomass productivity of 2.37 g L −1 day −1 and maximum cell density of 11.68 g L −1 were achieved. Among all conditions tested, the maximum total fatty acid (TFA) content measured 271.9 mg g −1 dry weight in the late stationary phase. Nitrogen and phosphorus starvation strongly induced neutral lipid (TAG) accumulation, up to 90.3% of TFA, which mostly consisted of the monounsaturated fatty acid C18:1n−9 (oleic acid, OA). PUFAs were also abundant and together accounted for 30.3-45.8% of total triacylglycerol (TAG). The highest eicosapentaenoic acid (EPA) content (C20:5n−3) amounted to 6.7 mg g −1 dry weight (4.9% TFA) in control treatments, while the highest arachidonic acid (ARA) content (C20:4n−6) was 9.6 mg g −1 dry weight (3.5% TFA) in the late stationary phase. Phosphorus starvation was an effective strategy to obtain high total fatty acid yields (mg L −1) while maintaining the protein, total PUFA, and omega-3 fatty acid contents.

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Section: Salinity Tolerance Of Koliella Antarcticamentioning

confidence: 99%

Growth and LC-PUFA production of the cold-adapted microalga Koliella antarctica in photobioreactors

et al. 2018

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“…18,19 They are distinguished from oil crops by their unique capacity to produce more lipids, demonstrating yields of 1800 to 2000 gal/acre/y, compared with only 50, 130, and 650 gal/acre/y for soybeans, rapeseed, and palm oil, respectively. 20,21 The driving factor for increased lipid accumulation is physical and chemical manipulations of the cultivation medium. 22,23 Most importantly, microalgae can thrive on freshwater, saltwater, and brackish water, and their cultivation does not require fertile lands, that could otherwise be dedicated to production of food resources.…”

Section: Introductionmentioning

confidence: 99%

“…29 D. salina strain is currently being commercially cultivated in Hutt and Whyhalla lagoons in Australia for bulk β-carotene production. 21 It has a relatively high lipids content in the range of 35% 30 ; also, under stress conditions, it can accumulate significant amounts of valuable substances, such as vitamins, proteins, and pigments, 31 including β-carotene. 32 The stress factor, here, is the homeostasis disruption by salinity, leading to cell metabolism alterations during homeostasis acclimation and restoration.…”

Section: Introductionmentioning

confidence: 99%

Improving the economic feasibility of biodiesel production from microalgal biomass via high‐value products coproduction

et al. 2020

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Summary Microalgal biodiesel has emerged as a promising fuel source, but has still not been adopted commercially. One of the several inherent challenges is its high production cost, which mandates the need to develop an integrated process to produce other valuable coproducts economically. This article combines life cycle assessment and preliminary life cycle cost assessment of a proposed biorefinery, in which a high value product, β‐carotene, is coproduced from microalgae with biodiesel. The GaBi 6 environmental management software was employed to investigate the environmental impact associated with the production life cycle. The mass flow rates and the energy consumed in all stages of biodiesel and β‐carotene coproduction for the functional unit of 1 kg of biodiesel were assessed. When the coproduction of β‐carotene was not taken into consideration, the total energy input for a functional unit of 1.0 kg biodiesel/m2/y and the net energy ratio, that is, energy returned on energy invested were estimated to be 128.1 GWh/y and 0.27, respectively. The life cycle cost analysis showed that although the total production cost associated with coproduction of β‐carotene from Dunaliella salina was higher than that of the sole production of biodiesel, it generates a hiked revenue of up to $37 million/y. Over the system lifetime of 10 years, the sole production of biodiesel showed a loss of US$345 million per functional unit, whereas the coproduction of β‐carotene achieved a net profit of US$120.7 million per functional unit. This work clearly showed that the coproduction of β‐carotene with biodiesel from D. salina overcomes the cost‐ineffectiveness resulting from the production of biodiesel alone.

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“…However, limited research has been conducted on growth promoting sustainable cultivation techniques to ascertain the biomass productivity through biotic interactions despite the enormous potential of synthetic/natural co-cultivation. The metabolite and nutrients exuded by the phycospheric growth promoting bacteria could offer impressive biomass yields with suitable fatty acid properties to make biodiesel [ 10 – 12 ]. Furthermore, the mutualistic phycospheric bacteria can grow in similar physicochemical environments whenever co-cultivated, while it could not grow alone in the same media, and remarkable growth co-operation for the nutrients was shown which could reduce the cost of the cultivation [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Pelagibaca bermudensis promotes biofuel competence of Tetraselmis striata in a broad range of abiotic stressors: dynamics of quorum-sensing precursors and strategic improvement in lipid productivity

Patidar

Kim

et al. 2018

Biotechnol Biofuels

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BackgroundAmelioration of biofuel feedstock of microalgae using sustainable means through synthetic ecology is a promising strategy. The co-cultivation model (Tetraselmis striata and Pelagibaca bermudensis) was evaluated for the robust biofuel production under varying stressors as well as with the selected two-stage cultivation modes. In addition, the role of metabolic exudates including the quorum-sensing precursors was assessed.ResultsThe co-cultivation model innovated in this study supported the biomass production of T. striata in a saline/marine medium at a broad range of pH, salinity, and temperature/light conditions, as well as nutrient limitation with a growth promotion of 1.2–3.6-fold. Hence, this developed model could contribute to abiotic stress mitigation of T. striata. The quorum-sensing precursor dynamics of the growth promoting bacteria P. bermudensis exhibited unique pattern under varying stressors as revealed through targeted metabolomics (using liquid chromatography–mass spectrometry, LC–MS). P. bermudensis and its metabolic exudates mutually promoted the growth of T. striata, which elevated the lipid productivity. Interestingly, hydroxy alkyl quinolones independently showed growth inhibition of T. striata on elevated concentration. Among two-stage cultivation modes (low pH, elevated salinity, and nitrate limitation), specifically, nitrate limitation induced a 1.5 times higher lipid content (30–31%) than control in both axenic and co-cultivated conditions.ConclusionPelagibaca bermudensis is established as a potential growth promoting native phycospheric bacteria for robust biomass generation of T. striata in varying environment, and two-stage cultivation using nitrate limitation strategically maximized the biofuel precursors for both axenic and co-cultivation conditions (T and T-PB, respectively). Optimum metabolic exudate of P. bermudensis which act as a growth substrate to T. striata surpasses the antagonistic effect of excessive hydroxy alkyl quinolones [HHQ, 4-hydroxy-2-alkylquinolines and PQS (pseudomonas quorum signal), 2-heptyl-3-hydroxy-4(1H)-quinolone].Electronic supplementary materialThe online version of this article (10.1186/s13068-018-1097-9) contains supplementary material, which is available to authorized users.

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Sustainable saline microalgae co-cultivation for biofuel production: A critical review

Cited by 101 publications

References 172 publications

Growth and LC-PUFA production of the cold-adapted microalga Koliella antarctica in photobioreactors

Growth and LC-PUFA production of the cold-adapted microalga Koliella antarctica in photobioreactors

Improving the economic feasibility of biodiesel production from microalgal biomass via high‐value products coproduction

Pelagibaca bermudensis promotes biofuel competence of Tetraselmis striata in a broad range of abiotic stressors: dynamics of quorum-sensing precursors and strategic improvement in lipid productivity

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