Process Design Analysis for the Valorisation and Selection of Integrated Micro-algae Biorefineries

Psycha, Melina; Pyrgakis, Konstantinos A.; Kokossis, Antonis

doi:10.1016/b978-0-444-63455-9.50092-1

Cited by 9 publications

(1 citation statement)

References 8 publications

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“…Alternatively, a new approach is presented in this study, based on the utilization of nitrogen fixing microalgae-bacteria consortiums [8], which can result in high biomass productivity [9] and lower operating costs [10]. Additionally, the resulting biomass can be used for biofuels production with lower operating costs, based on the more efficient microalgae/bacteria cultivation system [11], low energy consumption harvesting technologies [12], and eco-efficient extraction/purification techniques [13,14].…”

Section: Introductionmentioning

confidence: 99%

Symbiotic Co-Culture of Scenedesmus sp. and Azospirillum brasilense on N-Deficient Media with Biomass Production for Biofuels

et al. 2019

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The treatment of nitrogen-deficient agriculture wastewater, arising from the vegetable and fruit processing, is a significant problem that limits the efficiency of its biological treatment. This study evaluates the effectiveness of the symbiotic co-culture of Azospirillum brasilense and Scenedesmus sp., under two nitrogen levels (8.23 mg L−1 and 41.17 mg L−1) and mixing systems (aeration and magnetic stirring), aiming to simultaneously use the N-deficient media for their growth while producing biomass for biofuels. Microalgae growth and biomass composition, in terms of protein, carbohydrate and fatty acid contents, were evaluated at the end of the exponential growth phase (15 days after inoculation). Results show that the symbiotic co-culture of microalgae-bacteria can be effectively performed on nitrogen-deficient media and has the potential to enhance microalgae colony size and the fatty acid content of biomass for biofuels. The highest biomass concentration (103 ± 2 mg·L−1) was obtained under aeration, with low nitrogen concentration, in the presence of A. brasilense. In particular, aeration contributed to, on average, a higher fatty acid content (48 ± 7% dry weight (DW)) and higher colony size (164 ± 21 µm2) than mechanical stirring (with 39 ± 2% DW and 134 ± 21 µm2, respectively) because aeration contribute to better mass transfer of gases in the culture. Also, co-culturing contributed in average, to higher colony size (155 ± 21 µm2) than without A. brasilense (143 ± 21 µm2). Moreover, using nitrogen deficient wastewater as the culture media can contribute to decrease nitrogen and energy inputs. Additionally, A. brasilense is approved and already extensively used in agriculture and wastewater treatment, without known environmental or health issues, simplifying the biomass processing for the desired application.

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Section: Introductionmentioning

confidence: 99%

Symbiotic Co-Culture of Scenedesmus sp. and Azospirillum brasilense on N-Deficient Media with Biomass Production for Biofuels

et al. 2019

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Systematic synthesis and integration of multiple‐effect distillation into overall processes: The case of biorefineries

Pyrgakis

Kokossis

2019

AIChE Journal

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Chemical engineering is challenged by new chemistries that convert raw materials (biomass, biogenic waste) into chemicals through numerous promising, yet untested, chemical/biochemical reactions. Process and energy integration are essential to provide viable recommendations as downstream separation costs are often prohibitive to support the selected reactions. Distillation remains attractive for separation, whereas multiple‐effect distillation (MED) offers high energy savings, fully exploiting the potential to integrate separations with the background process. Whereas model‐based methods are plentiful for stand‐alone MED designs, integration of units with the background process is restricted by graphical or inspection methods, which are prone to miss optimality and impractical to use for high‐throughput screening. This work contributes with the introduction of an optimization approach that addresses challenges in allocation and integration of MED by considering methods to systematize design options and to automate decision‐making. The approach is illustrated in a real‐life biorefinery securing 70% savings under a small investment. © 2019 American Institute of Chemical Engineers

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Selection of Biorefinery Routes: The Case of Xylitol and its Integration with an Organosolv Process

Mountraki

Koutsospyros

Mlayah

et al. 2017

Waste Biomass Valor

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Process Design Analysis for the Valorisation and Selection of Integrated Micro-algae Biorefineries

Cited by 9 publications

References 8 publications

Symbiotic Co-Culture of Scenedesmus sp. and Azospirillum brasilense on N-Deficient Media with Biomass Production for Biofuels

Symbiotic Co-Culture of Scenedesmus sp. and Azospirillum brasilense on N-Deficient Media with Biomass Production for Biofuels

Systematic synthesis and integration of multiple‐effect distillation into overall processes: The case of biorefineries

Selection of Biorefinery Routes: The Case of Xylitol and its Integration with an Organosolv Process

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