Harvesting of Microalgae for Biomass Production

Roselet, Fábio; Vandamme, Dries; Muylaert, Koenraad; Abreu, Paulo César

doi:10.1007/978-981-13-2264-8_10

Cited by 21 publications

(18 citation statements)

References 113 publications

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“…Thus, reducing the costs of biomass harvesting is a problem that is currently widely investigated using single-and multiple-step harvesting systems; however, none of those systems are ideal because numerous factors (algal species, culture system, culture volume, total biomass yield, etc.) need to be considered [323]. According to recent studies, the use of different harvesting methods applied sequentially (e.g., flocculation followed by membrane filtration and combined with centrifugation) seems to be a promising solution to reduce the costs of phycoremediation [323].…”

Section: Advantages Challenges and Future Perspectives On Pharmaceuti...mentioning

confidence: 99%

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Pharmaceuticals in the Aquatic Environment: A Review on Eco-Toxicology and the Remediation Potential of Algae

Hejna

Kapuścińska

Aksmann

2022

IJERPH

102

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The pollution of the aquatic environment has become a worldwide problem. The widespread use of pesticides, heavy metals and pharmaceuticals through anthropogenic activities has increased the emission of such contaminants into wastewater. Pharmaceuticals constitute a significant class of aquatic contaminants and can seriously threaten the health of non-target organisms. No strict legal regulations on the consumption and release of pharmaceuticals into water bodies have been implemented on a global scale. Different conventional wastewater treatments are not well-designed to remove emerging contaminants from wastewater with high efficiency. Therefore, particular attention has been paid to the phycoremediation technique, which seems to be a promising choice as a low-cost and environment-friendly wastewater treatment. This technique uses macro- or micro-algae for the removal or biotransformation of pollutants and is constantly being developed to cope with the issue of wastewater contamination. The aims of this review are: (i) to examine the occurrence of pharmaceuticals in water, and their toxicity on non-target organisms and to describe the inefficient conventional wastewater treatments; (ii) present cost-efficient algal-based techniques of contamination removal; (iii) to characterize types of algae cultivation systems; and (iv) to describe the challenges and advantages of phycoremediation.

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Section: Advantages Challenges and Future Perspectives On Pharmaceuti...mentioning

confidence: 99%

“…need to be considered [323]. According to recent studies, the use of different harvesting methods applied sequentially (e.g., flocculation followed by membrane filtration and combined with centrifugation) seems to be a promising solution to reduce the costs of phycoremediation [323].…”

Section: Advantages Challenges and Future Perspectives On Pharmaceuti...mentioning

confidence: 99%

Pharmaceuticals in the Aquatic Environment: A Review on Eco-Toxicology and the Remediation Potential of Algae

Hejna

Kapuścińska

Aksmann

2022

IJERPH

102

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“…processes, these processes still represent a limiting step to the microalgae biomass production chain (Oliveira et al 2018;De Melo Aguiar et al 2019;Xue et al 2019;Zhou et al 2019;Liu et al 2019a). This is mainly because large-scale cultivations often occur in large volumes and with low productivitywhich makes it difficult for efficient harvesting (Roselet et al 2019).…”

Section: Microalgae Harvesting and Biomass Processingmentioning

confidence: 99%

“…This is mainly because large‐scale cultivations often occur in large volumes and with low productivity – which makes it difficult for efficient harvesting (Roselet et al . 2019).…”

Section: Microalgae Harvesting and Biomass Processingmentioning

confidence: 99%

A multidisciplinary review ofTetradesmus obliquus: a microalga suitable for large‐scale biomass production and emerging environmental applications

Oliveira

Prasad

et al. 2021

Reviews in Aquaculture

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Microalgae biomass is among one of the most promising sustainable raw materials for many industrial sectors especially biodiesel production. Although a great diversity of microalgae species has been described and isolated, few have been used for large-scale cultivation. This review presents a multidisciplinary overview of studies on Tetradesmus obliquusa freshwater microalga suitable for largescale production and emerging environmental applications. It reviews the taxonomic history of T. obliquus and its potential commercial applications, including cultivations techniques and environmental parameters, production systems, harvesting and drying of biomass, and its biochemical composition. In addition, a model refinery for T. obliquus is proposed that combines the main productive bioprocesses. Finally, a bibliometric analysis is presented and opportunities for future research with T. obliquus are identified.

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“…During flocculation, the addition of chemicals leads to the aggregation of microalgal cells forming large flocs [11]. Flocculation can be induced by neutralizing the surface charge of the cells (charge neutralization), by partially reversing the charge of the particle surface, resulting in the connection of particles through patches with opposite charge (electrostatic patch), by precipitation caused by an aggregating polymer network that entangles microalgal cells (sweeping mechanism), or by forming bridges between individual particles (bridging) [12,13].…”

Section: Introductionmentioning

confidence: 99%

Harvesting microalgal-bacterial biomass from biogas upgrading process and evaluating the impact of flocculants on their growth during repeated recycling of the spent medium

et al. 2020

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Microalgal-bacterial consortium can be used to upgrade biogas by removing CO 2 and H 2 S. Photosynthetic biogas upgrading requires harvesting microalgal-bacterial biomass in order to use the biomass-free cultivation medium as scrubbing liquid in the absorption column. In this study, the efficiency of different flocculants (Zetag 8125, cationically modified cellulose nanocrystals, Tanfloc, chitosan, and FeCl 3 ) to harvest microalgal-bacterial biomass used for biogas upgrading in alkaline medium (inorganic carbon concentration up to 1800 mg L − 1 and a pH~10) was evaluated. Zetag and cationic cellulose nanocrystals resulted in maximum flocculation efficiencies of 95% (optimal dose 30 mg g − 1 ) and 93% (optimal dose 20 mg g − 1 ), respectively. Low flocculation was observed with other flocculants at doses as high as 200 mg g − 1 , which can be ascribed to the high pH of the alkaline medium. Zetag and cationic cellulose nanocrystals were selected for harvesting the biomass during semi-continuous cultivation of the microalgal consortium. Both Zetag and cationic cellulose nanocrystals were effective in flocculating the biomass with efficiencies of over 90% during five successive harvesting cycles. Gravity settling of the flocs formed by Zetag and cationic cellulose nanocrystals resulted in low biomass concentration factors of 7.7 and 2.0, respectively. Screening of flocs using a nylon mesh screen (pore size of 180 μm) resulted in a biomass concentration factor as high as 19.8. Zetag and cationic cellulose nanocrystals could be useful in harvesting biomass under high alkaline conditions without detrimental effects on biomass growth.

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Harvesting of Microalgae for Biomass Production

Cited by 21 publications

References 113 publications

Pharmaceuticals in the Aquatic Environment: A Review on Eco-Toxicology and the Remediation Potential of Algae

Pharmaceuticals in the Aquatic Environment: A Review on Eco-Toxicology and the Remediation Potential of Algae

A multidisciplinary review ofTetradesmus obliquus: a microalga suitable for large‐scale biomass production and emerging environmental applications

Harvesting microalgal-bacterial biomass from biogas upgrading process and evaluating the impact of flocculants on their growth during repeated recycling of the spent medium

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