Productivity, carbon utilization, and energy content of mass in scalable microalgae systems

Murray, Kyle E.; Shields, Jeremy A.; Garcia, Nicholas; Healy, Frank

doi:10.1016/j.biortech.2012.03.012

Cited by 11 publications

(2 citation statements)

References 24 publications

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“…28 ± 1°C, Neochloris oleoabundans 25.6°C, Chlorella sp. 23–29°C, Dunaliella salina 23–29°C, and Chlorella vulgaris 23–29°C) range from 42.3 to 7100 mg C L −1 day −1 (Huerlimann et al, 2010 ; Araujo et al, 2011 ; Kim, 2011 ; Zhou et al, 2011 ; Murray et al, 2012 ). The incubation temperatures for the strains reported in the literature were mainly below those that were used in this experiment.…”

Section: Discussionmentioning

confidence: 99%

Biomass and Neutral Lipid Production in Geothermal Microalgal Consortia

Bywaters

Fritsen

2015

Front. Bioeng. Biotechnol.

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Recently, technologies have been developed that offer the possibility of using algal biomass as feedstocks to energy producing systems – in addition to oil-derived fuels (Bird et al., 2011, 2012). Growing native mixed microalgal consortia for biomass in association with geothermal resources has the potential to mitigate negative impacts of seasonally low temperatures on biomass production systems as well as mitigate some of the challenges associated with growing unialgal strains. We assessed community composition, growth rates, biomass, and neutral lipid production of microalgal consortia obtained from geothermal hot springs in the Great Basin/Nevada area that were cultured under different thermal and light conditions. Biomass production rates ranged from 39.0 to 344.1 mg C L−1 day−1. The neutral lipid production in these consortia with and without shifts to lower temperatures and additions of bicarbonate (both environmental parameters that have been shown to enhance neutral lipid production) ranged from 0 to 38.74 mg free fatty acids (FFA) and triacylglycerols (TAG) L−1 day−1; the upper value was approximately 6% of the biomass produced. The higher lipid values were most likely due to the presence of Achnanthidium sp. Palmitic and stearic acids were the dominant free fatty acids. The S/U ratio (the saturated to unsaturated FA ratio) decreased for cultures shifted from their original temperature to 15°C. Biomass production was within the upper limits of those reported for individual strains, and production of neutral lipids was increased with secondary treatment. All results demonstrate a potential of culturing and manipulating resultant microalgal consortia for biomass-based energy production and perhaps even for biofuels.

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Section: Discussionmentioning

confidence: 99%

Biomass and Neutral Lipid Production in Geothermal Microalgal Consortia

Bywaters

Fritsen

2015

Front. Bioeng. Biotechnol.

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“…En sistemas de doble propósito la fuente orgánica de estos cultivos regularmente proviene de carbono de efluentes con elevada carga orgánica (digestato) y el carbono inorgánico de mezcla de gases de combustión y aire (Olguín et al, 2015a;2015b). En algunos casos también se ha optado por sales de carbonato como fuente inorgánica de carbono (Murray et al, 2012;Olguín et al, 2015b).…”

Section: Hidrobiológicaunclassified

Biodiesel production from microalgae: progress and biotechnological prospects

et al. 2017

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RESUMENAntecedentes. Las microalgas son una alternativa para la obtención de biodiésel por su alto rendimiento de lípidos y su perfil de ácidos grasos. Objetivos. Hacer una revisión sobre los avances y perspectivas actuales de la producción de biodiésel a partir de microalgas. Métodos. Se realizó una búsqueda actualizada de los trabajos de investigación relacionados con la producción de biodiésel a partir de microalgas, con especial énfasis en la biosíntesis de ácidos grasos y triglicéridos, la producción de biomasa, las técnicas de extracción, los procesos biotecnológicos implementados en sistemas de cultivo, la transesterificación y los sistemas de doble propósito. Resultados. Las microalgas tienen rendimientos altos de producción de lípidos (59 m 3 ha -1 año -1 ), por lo que representa una alternativa para la obtención de biodiésel; sin embargo, el costo de producción y recuperación de biomasa sigue siendo elevado ($5.8 USD Kg -1 ), aunado a los altos requerimientos energéticos (33 MJ Kg -1 ). Actualmente no existen técnicas industriales factibles para la extracción de lípidos y se están probando los métodos por fluidos supercríticos, campo eléctrico de pulso, microondas y ultrasonicación. La biotecnología ha propuesto un novedoso sistema biológico mediante el uso de lipasas recuperadas de hongos filamentosos para el proceso de transesterificación, los cuales ya son comerciales, y ha logrado rendimientos de biocatálisis mayores al 90%. Los "sistema de doble propósito" pueden ser optimizados utilizando un diseño modular que establezca los procesos y operaciones unitarias bien definidas. Conclusiones. El uso de microalgas para la obtención de biodiésel representa una técnica viable gracias a su alto contenido lipídico y a su perfil de ácidos grasos, aunque hace falta el desarrollo de tecnologías que disminuyan el costo de producción. El uso de sistemas de doble propósito se vislumbra como una buena opción para reducir estos precios, al mismo tiempo que se reusan aguas residuales. ABSTRACTBackground. Microalgae have proven to be an excellent alternative to produce biodiesel due of its high lipid yield and its fatty acid profile. Goals. A review was made on the current advances and perspectives on the production of biodiesel from microalgae. Methods. An updated search was done of the research work related to biodiesel production from microalgae, emphasizing fatty acid and triglyceride biosynthesis, biomass production, extraction techniques, biotechnological processes implemented in culture systems, transesterification and dual purpose systems. Results. Microalgae have shown high yields of lipid production (59 m 3 ha -1 year -1 ) representing an alternative to produce biodiesel. However, costs of biomass production and recovery remain high (US $ 5.8 kg -1 ), coupled with high-energy requirements (33 MJ kg-kg -1 ). Supercritical fluids, electric pulse field, microwave and ultra sonication have being tested for lipid extraction, but currently there are no feasible industrial techniques in this field. Biotechnology ha...

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