Recovery of microalgal biomass and metabolites: process options and economics

Grima, E. Molina; Belarbi, El Hassan; Fernández, Francisco Gabriel Acién; Medina, Alfonso Robles; Chisti, Yusuf

doi:10.1016/s0734-9750(02)00050-2

Cited by 1,858 publications

(765 citation statements)

References 57 publications

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“…5 Selection of cost-effective technologies for biomass harvesting and drying Given the relatively low biomass concentration obtainable in microalgal cultivation systems due to the limit of light penetration (typically in the range of 1-5 g/L) and the small size of microalgal cells (typically in the range of 2-20 lm in diameter), costs and energy consumption for biomass harvesting are a significant concern needs to be addressed properly. Different technologies, including chemical flocculation, 75 biological flocculation, 76 filtration, 77 centrifugation, 78 and ultrasonic aggregation 79 have been investigated for microalgal biomass harvesting. In general, chemical and biological flocculation require only low operating costs; however, they have the disadvantage of requiring long processing period and having the risk of bioreactive product decomposition.…”

Section: Design Of Advanced Photobioreactorsmentioning

confidence: 99%

Biofuels from Microalgae

Horsman

et al. 2008

Biotechnology Progress

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397

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Microalgae are a diverse group of prokaryotic and eukaryotic photosynthetic microorganisms that grow rapidly due to their simple structure. They can potentially be employed for the production of biofuels in an economically effective and environmentally sustainable manner. Microalgae have been investigated for the production of a number of different biofuels including biodiesel, bio-oil, bio-syngas, and bio-hydrogen. The production of these biofuels can be coupled with flue gas CO 2 mitigation, wastewater treatment, and the production of high-value chemicals. Microalgal farming can also be carried out with seawater using marine microalgal species as the producers. Developments in microalgal cultivation and downstream processing (e.g., harvesting, drying, and thermochemical processing) are expected to further enhance the costeffectiveness of the biofuel from microalgae strategy.

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Section: Design Of Advanced Photobioreactorsmentioning

confidence: 99%

Biofuels from Microalgae

Horsman

et al. 2008

Biotechnology Progress

728

397

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“…Another alternative is using expanded bed adsorption chromatography, which is also used to isolate native potato proteins from potato juice, followed by ultrafiltration to concentrate the protein fractions and remove anti-nutritional factors [72]. The highest component cost is the purification via chromatography, with estimated processing cost of USD 184/kg-product [81]. Consequently this process is only feasible if the product has a high value application, e.g.…”

Section: Latexmentioning

confidence: 99%

Valorisation of Proteins from Rubber Tree

WIDYARANI

Coulen

Sanders

et al. 2016

Waste Biomass Valor

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Purpose The objective of this study was to identify the availability, possible applications, and economic potential of proteins that are present in different parts of the rubber tree. Proteins from non-food sources can be used in e.g. animal feed or biochemicals production with no or little competition with food production, rendering them important biobased feedstock. Rubber tree is primarily grown for its latex that is used in rubber production. Indonesia has the largest rubber plantation area that is mostly owned and run by smallholder farmers. Using non-latex fractions from the rubber tree may generate additional income, and increase the economics of rubber plantations in general. Methods Several biomass streams from the rubber tree and subsequent latex processing were considered. Data were compiled from literature, a case study, and interviews with researchers, smallholder farmers, and managers at rubber processing plant and plantation. Results Latex waste streams, seeds, and leaves were considered to have the highest potential based on the amount of available proteins, and processes to isolate proteins from these streams were proposed. Isolation of specific functional properties from natural sources requires complex (and expensive) separation processes and therefore only economically feasible when specific use of the protein(s) for high value applications can be identified. Purification of many interesting proteins from latex fractions has already been described. Processing of seeds and leaves may also yield useful proteins for food, other purposes, and also still unknown high value applications. Conclusions A biorefinery concept can be applied to obtain multiple products from the seeds and leaves, and protein extraction can be performed with available knowledge and technology. Small scale processing can be more beneficial for the farmers, especially if the products are used locally for feed.

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“…disk stack, bowl, tubular bowl and scroll discharger) in this study it is considered a disk stack centrifuge (Molina Grima et al, 2003). This step is critical to the economic and sustainability viability of microalgae cultivation, as large energy inputs are required (Mata et al, 2010b).…”

Section: Process Description: Assumptions and Conditionsmentioning

confidence: 99%

Sustainability and economic evaluation of microalgae grown in brewery wastewater

Mata

Mendes

Caetano

et al. 2014

Bioresource Technology

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a b s t r a c tThis article evaluates the sustainability and economic potential of microalgae grown in brewery wastewater for biodiesel and biomass production. Three sustainability and two economic indicators were considered in the evaluation within a life cycle perspective. For the production system the most efficient process units were selected. Results show that harvesting and oil separation are the main process bottlenecks. Microalgae with higher lipid content and productivity are desirable for biodiesel production, although comparable to other biofuel's feedstock concerning sustainability. However, improvements are still needed to reach the performance level of fossil diesel. Profitability reaches a limit for larger cultivation areas, being higher when extracted biomass is sold together with microalgae oil, in which case the influence of lipid content and areal productivity is smaller. The values of oil and/or biomass prices calculated to ensure that the process is economically sound are still very high compared with other fuel options, especially biodiesel.

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Recovery of microalgal biomass and metabolites: process options and economics

Cited by 1,858 publications

References 57 publications

Biofuels from Microalgae

Biofuels from Microalgae

Valorisation of Proteins from Rubber Tree

Sustainability and economic evaluation of microalgae grown in brewery wastewater

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