Harvesting of Microalgal Biomass

2013 ◽  
pp. 77-88 ◽  
Author(s):  
Manjinder Singh ◽  
Rekha Shukla ◽  
Keshav Das
Keyword(s):  
Microalgal Biomass

scholarly journals Microalgal Cell Biofactory—Therapeutic, Nutraceutical and Functional Food Applications

Plants ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 836
Author(s):  
Boda Ravi Kiran ◽  
S. Venkata Mohan
Keyword(s):  
Bioactive Compounds ◽  
Well Being ◽  
Human Pathogens ◽  
Microalgal Biomass ◽  
Aquaculture Feed ◽  
Biological Extracts ◽  
Food And Feed ◽  
Food Applications ◽  
Environmental Requirements ◽  
Health And Well Being

Microalgae are multifaceted photosynthetic microorganisms with emerging business potential. They are present ubiquitously in terrestrial and aquatic environments with rich species diversity and are capable of producing significant biomass. Traditionally, microalgal biomass is being used as food and feed in many countries around the globe. The production of microalgal-based bioactive compounds at an industrial scale through biotechnological interventions is gaining interest more recently. The present review provides a detailed overview of the key algal metabolites, which plays a crucial role in nutraceutical, functional foods, and animal/aquaculture feed industries. Bioactive compounds of microalgae known to exhibit antioxidant, antimicrobial, antitumor, and immunomodulatory effects were comprehensively reviewed. The potential microalgal species and biological extracts against human pathogens were also discussed. Further, current technologies involved in upstream and downstream bioprocessing including cultivation, harvesting, and cell disruption were documented. Establishing microalgae as an alternative supplement would complement the sustainable and environmental requirements in the framework of human health and well-being.

scholarly journals Processing Methodologies of Wet Microalga Biomass Toward Oil Separation: An Overview

Molecules ◽  
2021 ◽  
Vol 26 (3) ◽  
pp. 641
Author(s):  
Vânia Pôjo ◽  
Tânia Tavares ◽  
Francisco Xavier Malcata
Keyword(s):  
Food System ◽  
Lipid Extraction ◽  
High Energy ◽  
Economic Feasibility ◽  
Alternative Source ◽  
Microalgal Biomass ◽  
Energy Demands ◽  
Chemical Profiles ◽  
System Sustainability ◽  
Industrial Level

One of the main goals of Mankind is to ensure food system sustainability—including management of land, soil, water, and biodiversity. Microalgae accordingly appear as an innovative and scalable alternative source in view of the richness of their chemical profiles. In what concerns lipids in particular, microalgae can synthesize and accumulate significant amounts of fatty acids, a great fraction of which are polyunsaturated; this makes them excellent candidates within the framework of production and exploitation of lipids by various industrial and health sectors, either as bulk products or fine chemicals. Conventional lipid extraction methodologies require previous dehydration of microalgal biomass, which hampers economic feasibility due to the high energy demands thereof. Therefore, extraction of lipids directly from wet biomass would be a plus in this endeavor. Supporting processes and methodologies are still limited, and most approaches are empirical in nature—so a deeper mechanistic elucidation is a must, in order to facilitate rational optimization of the extraction processes. Besides circumventing the current high energy demands by dehydration, an ideal extraction method should be selective, sustainable, efficient, harmless, and feasible for upscale to industrial level. This review presents and discusses several pretreatments incurred in lipid extraction from wet microalga biomass, namely recent developments and integrated processes. Unfortunately, most such developments have been proven at bench-scale only—so demonstration in large facilities is still needed to confirm whether they can turn into competitive alternatives.

scholarly journals Optimisation of microalgal cultivation via nutrient-enhanced strategies: the biorefinery paradigm

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Gonzalo M. Figueroa-Torres ◽  
Jon K. Pittman ◽  
Constantinos Theodoropoulos
Keyword(s):  
Kinetic Model ◽  
Growth Dynamics ◽  
Value Added ◽  
Cost Effective ◽  
Predictive Modelling ◽  
Nitrogen And Phosphorus ◽  
Predictive Capacity ◽  
Microalgal Biomass ◽  
Microalgal Cultivation ◽  
Lipid Formation

Abstract Background The production of microalgal biofuels, despite their sustainable and renowned potential, is not yet cost-effective compared to current conventional fuel technologies. However, the biorefinery concept increases the prospects of microalgal biomass as an economically viable feedstock suitable for the co-production of multiple biofuels along with value-added chemicals. To integrate biofuels production within the framework of a microalgae biorefinery, it is not only necessary to exploit multi-product platforms, but also to identify optimal microalgal cultivation strategies maximising the microalgal metabolites from which biofuels are obtained: starch and lipids. Whilst nutrient limitation is widely known for increasing starch and lipid formation, this cultivation strategy can greatly reduce microalgal growth. This work presents an optimisation framework combining predictive modelling and experimental methodologies to effectively simulate and predict microalgal growth dynamics and identify optimal cultivation strategies. Results Microalgal cultivation strategies for maximised starch and lipid formation were successfully established by developing a multi-parametric kinetic model suitable for the prediction of mixotrophic microalgal growth dynamics co-limited by nitrogen and phosphorus. The model’s high predictive capacity was experimentally validated against various datasets obtained from laboratory-scale cultures of Chlamydomonas reinhardtii CCAP 11/32C subject to different initial nutrient regimes. The identified model-based optimal cultivation strategies were further validated experimentally and yielded significant increases in starch (+ 270%) and lipid (+ 74%) production against a non-optimised strategy. Conclusions The optimised microalgal cultivation scenarios for maximised starch and lipids, as identified by the kinetic model presented here, highlight the benefits of exploiting modelling frameworks as optimisation tools that facilitate the development and commercialisation of microalgae-to-fuel technologies.

Improvement of methane production at alkaline and neutral pH from anaerobic co-digestion of microalgal biomass and cheese whey

2021 ◽  
pp. 107972
Author(s):  
Jack Rincón-Pérez ◽  
Lourdes B. Celis ◽  
Marcia Morales ◽  
Felipe Alatriste-Mondragón ◽  
Aida Tapia-Rodríguez ◽  
...  
Keyword(s):  
Methane Production ◽  
Cheese Whey ◽  
Microalgal Biomass ◽  
Neutral Ph

Incorporation of defatted microalgal biomass (Tetraselmis sp. CTP4) at the expense of soybean meal as a feed ingredient for juvenile gilthead seabream (Sparus aurata)

2020 ◽  
Vol 47 ◽  
pp. 101869 ◽  
Author(s):  
Hugo Pereira ◽  
Manuel Sardinha ◽  
Tamára Santos ◽  
Luísa Gouveia ◽  
Luísa Barreira ◽  
...  
Keyword(s):  
Soybean Meal ◽  
Sparus Aurata ◽  
Gilthead Seabream ◽  
Feed Ingredient ◽  
Microalgal Biomass

scholarly journals Effect of Light Intensity and Quality on Growth Rate and Composition of Chlorella vulgaris

Plants ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 31 ◽  
Author(s):  
Maria N. Metsoviti ◽  
George Papapolymerou ◽  
Ioannis T. Karapanagiotidis ◽  
Nikolaos Katsoulas
Keyword(s):  
Growth Rate ◽  
Light Intensity ◽  
Chlorella Vulgaris ◽  
Lipid Content ◽  
Growth Rates ◽  
Solar Irradiance ◽  
White Led ◽  
Microalgal Biomass ◽  
Nm Range ◽  
Effect Of Light

In this research, the effect of solar irradiance on Chlorella vulgaris cultivated in open bioreactors under greenhouse conditions was investigated, as well as of ratio of light intensity in the 420–520 nm range to light in the 580–680 nm range (I420–520/I580–680) and of artificial irradiation provided by red and white LED lamps in a closed flat plate laboratory bioreactor on the growth rate and composition. The increase in solar irradiance led to faster growth rates (μexp) of C. vulgaris under both environmental conditions studied in the greenhouse (in June up to 0.33 d−1 and in September up to 0.29 d−1) and higher lipid content in microalgal biomass (in June up to 25.6% and in September up to 24.7%). In the experiments conducted in the closed bioreactor, as the ratio I420–520/I580–680 increased, the specific growth rate and the biomass, protein and lipid productivities increased as well. Additionally, the increase in light intensity with red and white LED lamps resulted in faster growth rates (the μexp increased up to 0.36 d−1) and higher lipid content (up to 22.2%), while the protein, fiber, ash and moisture content remained relatively constant. Overall, the trend in biomass, lipid, and protein productivities as a function of light intensity was similar in the two systems (greenhouse and bioreactor).

Whole conversion of microalgal biomass into biofuels through successive high-throughput fermentation

2019 ◽  
Vol 360 ◽  
pp. 797-805 ◽  
Author(s):  
Marwa M. El-Dalatony ◽  
El-Sayed Salama ◽  
Mayur B. Kurade ◽  
Kyoung-Yeol Kim ◽  
Sanjay P. Govindwar ◽  
...  
Keyword(s):  
High Throughput ◽  
Microalgal Biomass

Occurrence forms of key ash-forming elements in defatted microalgal biomass

Fuel ◽  
2017 ◽  
Vol 200 ◽  
pp. 182-185 ◽  
Author(s):  
Yinglong He ◽  
Xiangpeng Gao ◽  
Yu Qiao ◽  
Minghou Xu
Keyword(s):  
Microalgal Biomass
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