Photosynthetic aspects and lipid profiles in the mixotrophic alga Neochloris oleoabundans as useful parameters for biodiesel production

Baldisserotto, Costanza; Popovich, Cecilia A.; Giovanardi, Martina; Sabia, Alessandra; Ferroni, Lorenzo; Constenla, Diana Teresita; Leonardi, Patricia I.; Pancaldi, Simonetta

doi:10.1016/j.algal.2016.03.022

Cited by 47 publications

(38 citation statements)

References 55 publications

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“…Microalgae are regarded as very good candidates for their application in WW-TPs as tertiary phytoremediation treatments of urban wastewater (UWW) effluents and for natural resource preservation, thanks to recycling processes in a “waste-to-value” approach. As aforementioned, microalgal biomass is proposed for several uses (for example, as raw material for biofertilizer, feed, food/feed supplements, biofuel) [ 1 , 2 , 9 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ]. The proposed application of microalgae derived from bioremediation processes is mainly for the production of biofuels or biofertilizer, but also for feeding anaerobic biodigestion plants [ 1 , 2 , 9 , 19 , 22 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

“…It is plausible that native microalgae, isolated and thus already adapted to the physico-chemical characteristics of wastewater, can be both more productive and resilient to other organisms present in the water (examples: nitrifying bacteria, pathogens, grazers, parasites) than collection strains [ 7 , 38 , 40 ]. Overall, algae well-adapted to a cultivation medium do not show signs of stress and this can also be seen from their morphology [ 11 , 21 , 41 ].…”

Section: Introductionmentioning

confidence: 99%

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Removal of Nitrogen and Phosphorus from Thickening Effluent of an Urban Wastewater Treatment Plant by an Isolated Green Microalga

Baldisserotto

Demaria

Accoto

et al. 2020

Plants

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Microalgae are photosynthetic microorganisms and are considered excellent candidates for a wide range of biotechnological applications, including the removal of nutrients from urban wastewaters, which they can recover and convert into biomass. Microalgae-based systems can be integrated into conventional urban wastewater treatment plants (WW-TP) to improve the water depuration process. However, microalgal strain selection represents a crucial step for effective phytoremediation. In this work, a microalga isolated from the effluent derived from the thickening stage of waste sludge of an urban WW-TP was selected and tested to highlight its potential for nutrient removal. Ammonium and phosphate abatements by microalgae were evaluated using both the effluent and a synthetic medium in a comparative approach. Parallelly, the isolate was characterized in terms of growth capability, morphology, photosynthetic pigment content and photosystem II maximum quantum yield. The isolated microalga showed surprisingly high biomass yield and removal efficiency of both ammonium and phosphate ions from the effluent but not from the synthetic medium. This suggests its clear preference to grow in the effluent, linked to the overall characteristics of this matrix. Moreover, biomass from microalgae cultivated in wastewater was enriched in photosynthetic pigments, polyphosphates, proteins and starch, but not lipids, suggesting its possible use as a biofertilizer.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Removal of Nitrogen and Phosphorus from Thickening Effluent of an Urban Wastewater Treatment Plant by an Isolated Green Microalga

Baldisserotto

Demaria

Accoto

et al. 2020

Plants

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“…The authors concluded that this microalga is a good alternative to produce high quality biodiesel due to its capacity to accumulate neutral lipids (20 wt.%) with a major concentration of monounsaturated fatty acids [3]. Similarly, cultures of N. oleoabundans in both anaerobically digested dairy manure [4] and mixotrophic conditions [5] produced lipids suited for biodiesel production.…”

Section: Introductionmentioning

confidence: 99%

“…Despite Neochloris oleoabundans has shown both to grow in sustainable cultures [3,5,19] and to be an interesting alternative to produce oils to bio-fuel [20][21][22][23], few studies have been carried out in order to generate innovative technologies to produce biodiesel from its biomass [24,25]. BD.…”

Section: Introductionmentioning

confidence: 99%

Biodiesel production from Neochloris oleoabundans by supercritical technology

Hegel

Martín

Popovich

et al. 2017

Chemical Engineering and Processing: Process Intensification

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Oleaginous microalgae have been proposed as a sustainable alternative biomass to produce biodiesel in order to substitute conventional vegetable oils derived from oilseed crops. Particularly, recent studies pointed out the potential of N. oleoabundans, cultured in seawater or in anaerobically digested dairy manure, to produce triglycerides with high content of monounsaturated fatty acids. The supercritical technology has been recognized as a green sustainable alternative to transform biomass into valuable products. Thus, the aim of the present work was to study the direct supercritical alcohol processing of partially dried N. oleoabundans biomass and later reaction products fractionation by supercritical CO2 or liquid n-hexane. A direct alcoholysis of microalgae biomass was carried out at different temperatures (250 °C and 280 °C) and increasing reaction times in order to evaluate the fatty acid ester production. Bio-oils from microalgae with up to 35 wt.% fatty acid esters were obtained by two fold extraction with n-hexane. Conversely, supercritical CO2 fractionation produced upgraded bio-oils with up to 74 wt.% of fatty acid esters content

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“…It is a robust green algae that produces a considerable lipid yield, regardless of whether it is cultivated in fresh, brackish or seawater media, or subjected to intense light exposure, pH variations, mixotrophy or differing levels of nitrogen starvation [60,61].…”

Section: Substituting Fossil Fuel Functionsmentioning

confidence: 99%

Exergy Replacement Cost of Fossil Fuels: Closing the Carbon Cycle

et al. 2017

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Abstract:The Exergy Replacement Cost (ERC) is an indicator that is used to ascertain the sustainability of non-renewable resource depletion. Specifically, it measures the amount of exergy society would have to expend if it were forced to re-capture and re-concentrate dispersed minerals back into a manmade usable deposit. Due to an assumption regarding the non-substitutability of fossil fuels, the original method failed to properly account for them. In fact, it sub-estimated their exergy replacement cost forty-seven-fold, on average, when considering solar radiation to fuel, and by approximately fivefold when going from crop to fuel. This new method, via the cumulative exergy consumption (CExC), calculates the exergy replacement cost of photosynthesis and bio-energy production, as together they form the best available technology when it comes to closing the carbon cycle. This approach ties together the "cradle to grave" to the "grave to cradle", standardises the ERC calculations and enables comparisons between fuel and non-fuel mineral consumption. It also opens a discussion as to the role of the ERC in sustainability debates and whether resource depletion should be a matter of geological patrimony or material/energy services.

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Photosynthetic aspects and lipid profiles in the mixotrophic alga Neochloris oleoabundans as useful parameters for biodiesel production

Cited by 47 publications

References 55 publications

Removal of Nitrogen and Phosphorus from Thickening Effluent of an Urban Wastewater Treatment Plant by an Isolated Green Microalga

Removal of Nitrogen and Phosphorus from Thickening Effluent of an Urban Wastewater Treatment Plant by an Isolated Green Microalga

Biodiesel production from Neochloris oleoabundans by supercritical technology

Exergy Replacement Cost of Fossil Fuels: Closing the Carbon Cycle

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