Flocculation of Arthrospira maxima for improved harvesting

Caetano, Nídia S.; Martins, António A.; Gorgich, Malihe; Gutierrez, Diana M.R.; Ribeiro, Tiago Joel Pinto; Mata, Teresa M.

doi:10.1016/j.egyr.2019.08.083

Cited by 22 publications

(9 citation statements)

References 27 publications

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“…The downstream method entails lower-cost exploitation of high-value microalgae metabolites with high product recovery. The composition and productivity of microalgae mainly depends on cultivation mode, nutrient composition, and harvesting time [ 208 ]. The most commonly used harvesting techniques for performance, operating economy, and technological feasibility are membrane filtration, centrifugation, microfiltration, ultrafiltration, gravity sedimentation, electrolytic phase, electrophoresis, and magnetic separation [ 209 ].…”

Section: Harvesting and Downstream Process Of Microalgaementioning

confidence: 99%

Microalgal Cell Biofactory—Therapeutic, Nutraceutical and Functional Food Applications

Kiran

Mohan

2021

Plants

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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.

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Section: Harvesting and Downstream Process Of Microalgaementioning

confidence: 99%

Microalgal Cell Biofactory—Therapeutic, Nutraceutical and Functional Food Applications

Kiran

Mohan

2021

Plants

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“…(Vandamme et al, 2012). In a recent study, the effect of pH variations and addition of flocculant such as calcium chloride on the harvesting of microalgae Arthrospira maxima was studied and observed that pH > 10 and CaCl 2 0.2-2.0 gL −1 at a 1:30 ratio (v/v) of CaCl 2 /microalgae culture could be applied to harvest biomass efficiently (Caetano et al, 2020).…”

Section: Chemical Flocculationmentioning

confidence: 99%

Valorization of Wastewater Resources Into Biofuel and Value-Added Products Using Microalgal System

et al. 2021

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Wastewater is not a liability, instead considered as a resource for microbial fermentation and value-added products. Most of the wastewater contains various nutrients like nitrates and phosphates apart from the organic constituents that favor microbial growth. Microalgae are unicellular aquatic organisms and are widely used for wastewater treatment. Various cultivation methods such as open, closed, and integrated have been reported for microalgal cultivation to treat wastewater and resource recovery simultaneously. Microalgal growth is affected by various factors such as sunlight, temperature, pH, and nutrients that affect the growth rate of microalgae. Microalgae can consume urea, phosphates, and metals such as magnesium, zinc, lead, cadmium, arsenic, etc. for their growth and reduces the biochemical oxygen demand (BOD). The microalgal biomass produced during the wastewater treatment can be further used to produce carbon-neutral products such as biofuel, feed, bio-fertilizer, bioplastic, and exopolysaccharides. Integration of wastewater treatment with microalgal bio-refinery not only solves the wastewater treatment problem but also generates revenue and supports a sustainable and circular bio-economy. The present review will highlight the current and advanced methods used to integrate microalgae for the complete reclamation of nutrients from industrial wastewater sources and their utilization for value-added compound production. Furthermore, pertaining challenges are briefly discussed along with the techno-economic analysis of current pilot-scale projects worldwide.

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“…There is no single most suitable harvesting method for each microalgae genera; in general, the ideal is to use a method that preserves the biomass composition and does not hinder the recovery of the product of interest. The most common harvesting methods include filtration (Monte et al, 2018), centrifugation, flotation, flocculation (Caetano et al, 2020b), electroflocculation (Zenouzi et al, 2013), gravity sedimentation, electrolytic process, electrophoresis and magnetic separation (Safi et al, 2014). However, combining harvesting methods with a previous step of chemical or biological coagulation/ flocculation thickening can increase process efficiency and reduce the operating costs (Grima et al, 2003).…”

Section: Harvestingmentioning

confidence: 99%

“…Flocculation can be used as a previous step to biomass recovery, as it consists of microalgae agglomeration, facilitating and increasing the efficiency of the subsequent processes (Caetano et al, 2020b). The repulsion charge between microalgae is neutralized or reduced by using flocculants such as aluminum sulfate salts (Al 2 (SO 4 ) 3 ), iron chloride (FeCl 3 ) and iron sulfate (Fe 2 (SO 4 ) 3 ), among others (Mata et al, 2016).…”

Section: Harvestingmentioning

confidence: 99%

Microalgae for biotechnological applications: Cultivation, harvesting and biomass processing

et al. 2020

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Flocculation of Arthrospira maxima for improved harvesting

Cited by 22 publications

References 27 publications

Microalgal Cell Biofactory—Therapeutic, Nutraceutical and Functional Food Applications

Microalgal Cell Biofactory—Therapeutic, Nutraceutical and Functional Food Applications

Valorization of Wastewater Resources Into Biofuel and Value-Added Products Using Microalgal System

Microalgae for biotechnological applications: Cultivation, harvesting and biomass processing

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