Harvesting Microalgal Biomass grown in Anaerobic Sewage Treatment Effluent by the Coagulation-Flocculation Method: Effect of pH

Cassini, Sérvio Túlio Alves; Francisco, Sara Aparecida; Antunes, Paulo Wagner Pereira; Oss, Rodrigo Nunes; Keller, Regina

doi:10.1590/1678-4324-2017160174

Cited by 35 publications

(15 citation statements)

References 26 publications

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“…Mixotrophic cultivation is a generalized two-stage mode in which microalgae have a high initial content of organic carbon, but are induced for assotrophic assimilation of CO 2 due to depletion of organic substances and oxygen production through photosynthesis [ 35 , 36 ]. During mixotrophic cultivation, microalgae grow under optimal autotrophic and heterotrophic conditions, combining the advantages of both cultivation modes [ 37 ]. Under such conditions, acetyl-CoA is produced and maintained both by fixing CO 2 and extracellular organic carbon, which indicates a decrease in photoinhibition.…”

Section: Methods Of Microalgae Cultivationmentioning

confidence: 99%

Microalgae: A Promising Source of Valuable Bioproducts

et al. 2020

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Microalgae are a group of autotrophic microorganisms that live in marine, freshwater and soil ecosystems and produce organic substances in the process of photosynthesis. Due to their high metabolic flexibility, adaptation to various cultivation conditions as well as the possibility of rapid growth, the number of studies on their use as a source of biologically valuable products is growing rapidly. Currently, integrated technologies for the cultivation of microalgae aiming to isolate various biologically active substances from biomass to increase the profitability of algae production are being sought. To implement this kind of development, the high productivity of industrial cultivation systems must be accompanied by the ability to control the biosynthesis of biologically valuable compounds in conditions of intensive culture growth. The review considers the main factors (temperature, pH, component composition, etc.) that affect the biomass growth process and the biologically active substance synthesis in microalgae. The advantages and disadvantages of existing cultivation methods are outlined. An analysis of various methods for the isolation and overproduction of the main biologically active substances of microalgae (proteins, lipids, polysaccharides, pigments and vitamins) is presented and new technologies and approaches aimed at using microalgae as promising ingredients in value-added products are considered.

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Section: Methods Of Microalgae Cultivationmentioning

confidence: 99%

Microalgae: A Promising Source of Valuable Bioproducts

et al. 2020

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“…They found 93.3% of biomass recovery in 60 mg L −1 , smaller efficiency compared to results seen in this study at 60 mg L −1 (97.9%). In another study, Cassini et al [24] also found high efficiency (95.6%) using a tanninbased coagulant-flocculant (Tanfloc ® POP) for the harvest of microalgae biomass (Chlorella sp.) at 100 mg L −1 .…”

Section: Discussion Of Preliminary Treatmentsmentioning

confidence: 95%

Evaluation of natural flocculant efficiency in the harvest of microalgae Monoraphidium contortum

et al. 2021

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This study assesses two parameters that can result in high efficiency in the recovery of the microalgae Monoraphidium contortum. The significant contribution of this paper is to test different coagulants in different conditions of concentration in the coagulation and flocculation processes followed by sedimentation to evidence the best coagulant and the best condition for harvesting of Monoraphidium contortum biomass. So the proposed methodology aimed to perform preliminary tests using a tannin-based cationic coagulant (TANFLOC SG®), FeCl2, and Al2 (SO4)3, where they were performed at concentrations of 0, 20, 40, 60, 80, and 100 mg L−1 at a fast mixing speed of 400 RPM. The tests determined 20 mg L−1 of Tanfloc SG® as the most efficient turbidity reduction in the preliminary test. The obtained results were used to construct a non-factorial central composite planning. Therefore, after a design of experiments, the study outcome shows the best turbidity removal range from the main tests came at 35 mg L−1 and 550 RPM of fast mixing speed.

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“…Heterotrophic microalgae culture has proven to be able to accelerate both cell growth rate [34] and cell density [44], decreasing costs for their cultivation and harvesting. Also, glucose used as main source for heterotrophic cultivation has been gradually replaced by low-cost alternatives, such as the hydrolysed product obtained from cellulosic materials [45], glycerol [42], or wastewater from several sources [46].…”

Section: Cultivation Modesmentioning

confidence: 99%

Microalgae: Cultivation Aspects and Bioactive Compounds

Coelho

Tundisi

Cerqueira

et al. 2019

Braz. arch. biol. technol.

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Microalgae are aquatic unicellular microorganisms that can be found both in freshwater and marine systems; are capable of photosynthesis; and can grow as individual cells or associated in chains or small colonies. Microalgae cultivation has gained large momentum among researchers in the past decades due to their ability to produce value metabolites, remarkable photosynthetic efficiency, and versatile nature. The wide technological potential, and thus increasing amount of scattered knowledge, may become the very first barrier that a post graduating student, or any non-specialist reader, will face when introduced to the subject. In this review paper, we access the core aspects of microalgae technology, covering their main characteristics, and comprehensively presenting the main features of their various cultivation modes and biological activity from metabolites.

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Harvesting Microalgal Biomass grown in Anaerobic Sewage Treatment Effluent by the Coagulation-Flocculation Method: Effect of pH

Abstract: Harvesting is a critical step in microalgal biomass production process for many reasons. Among

Cited by 35 publications

References 26 publications

Microalgae: A Promising Source of Valuable Bioproducts

Microalgae: A Promising Source of Valuable Bioproducts

Evaluation of natural flocculant efficiency in the harvest of microalgae Monoraphidium contortum

Microalgae: Cultivation Aspects and Bioactive Compounds

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