Rheological behavior of Chlorella sp. e Scenedesmus sp. cultures in different biomass concentrations

Santos, Michel de Oliveira dos; Martins, Márcio Arêdes; Coimbra, Jane Sélia dos Reis; Gates, Richard S.; Corrêdo, Lucas de Paula

doi:10.1590/s0100-69162013000500017

Cited by 11 publications

(3 citation statements)

References 15 publications

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“…On the other hand, the flow index n had a value of 0.90 for the first 25 hours and decreased suddenly up to 0.55 at 28 hours of culture. Dos Santos et al 6 studied the rheological behavior of cultures of Chlorella sp. and Scenedesmus sp.…”

Section: Introductionmentioning

confidence: 99%

Rheological Characterization of Scenedesmus Sp. Pastes(Up To100 G/L) Produced In A 200-L Raceway and Harvested By Coagulation-Flocculation-Sedimentation

2018

JCBSC

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The aim of this work was to carry out a complete rheological characterization of Scenedesmus sp. pastes with or without addition of a flocculant in terms of viscosity and viscoelasticity. Rheological measurements were carried out using a simple viscometer and a rheometer. K and n values from the Power law determined using both the viscometer Brookfiel and the rheometer Physica 1000 systems were quite different. Physica 1000 results are more reliable. In the case of this rheometer, viscosity vs. shear rate lines seem to be divided in three shear rate zones: a) below 0.04 s-1 , b) between 0.04 and 6 s-1 , and c) up to 6 s-1. For the Scenedesmus pastes without chitosan, K values ranged from 0.27-10.9 Pa.s n , while n values fluctuated between 0.73-0.92 (non-dimensional). R 2 values were quite good for all concentrations (from 0.95-0.98). Viscoelastic behavior of the algal suspensions was observed at any of the assessed concentrations. Viscoelastic properties of microalgae suspensions with chitosan are not very different from those presented by the samples without added chitosan. i.e., the elastic component was greater at low frequencies; whereas to high frequencies, the values of both components are equal. Rheological… Corzo-Rios et al.

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Section: Introductionmentioning

confidence: 99%

Rheological Characterization of Scenedesmus Sp. Pastes(Up To100 G/L) Produced In A 200-L Raceway and Harvested By Coagulation-Flocculation-Sedimentation

2018

JCBSC

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“…In addition, there is less control over water temperature, CO2 concentration, and lighting and mixing conditions in these systems. As a consequence of these factors, the production of algal biomass is lower when compared to cultures in closed systems, also called photobioreactors (Santos et al, 2013). However, the low operational and maintenance costs of open systems, the possibility of taking advantage of agroindustrial residues, and the ease of operation of the crop units have encouraged several authors to examine feasible outdoor crops (Park et al, 2011;Chiaramonti et al, 2013;Waller et al, 2012, Moazami et al, 2012.…”

Section: Introductionmentioning

confidence: 99%

OUTDOOR CULTIVATION OF Scenedesmus obliquus BR003 IN STIRRED TANKS BY AIRLIFT

et al. 2017

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ABSTRACT:The use of microalgae as a source of raw material for biofuel production has been highly targeted. Compared to other biological options for the capture and use of CO2, microalgae crops have the following advantages: high productivity, lack of competition with feed and foodbased products, use of unproductive and non-arable land, and allowance of the use of wastewater for its cultivation. The use of wastewater from industrial, agricultural, and domestic sewage has been indicated as an alternative means to reduce the cost of crops, since such waste is generally released into the environment without previous treatment. This work addresses the use of petrochemical wastewater (ARP) from effluent produced at the Gabriel Passos Refinery (Petrobrás refinery unit) for the cultivation of a strain of Scenedesmus obliquus BR003. Twelve experimental units of 20 L each were constructed in the experimental area of the Biofuel Laboratory of the Federal University of Viçosa, Minas Gerais, Brazil in an uncontrolled environment, and the cultures were evaluated by quantification of total carbohydrates, total lipids, dry biomass, and growth evaluated by absorbance. The results showed that the wastewater from petrochemical effluent is an efficient growth medium for the growth of Scenedesmus obliquus BR003 microalgae for large-scale cultivation on land that is not suitable for other agricultural crops.

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“…Muitas espécies podem ser induzidas a acumular diversos compostos (SOUSA et al;, como carboidratos, proteínas e lipídios (MORIOKA et al, 2014;HULTBERG et al, 2014). Estudos envolvendo o uso de microalgas vêm se intensificando devido ao potencial que apresentam, sendo uma fonte renovável que não compete diretamente com a produção de alimentos e por possibilitar a obtenção combustíveis com menor impacto ambiental quando comparado aos combustíveis fósseis (SANTOS, 2013).…”

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CULTIVO DE Spirulina sp. LEB 18 EM FOTOBIORREATOR TUBULAR HORIZONTAL PARA BIOFIXAÇÃO DE CO2

Cassuriaga¹,

Morais²,

Freitas³

et al. 2015

Anais Do XX Congresso Brasileiro De Engenharia Química

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RESUMO -O potencial biotecnológico das microalgas vem sendo estudado devido às diversas substâncias sintetizadas por estes micro-organismos como proteínas, carboidratos e lipídios. O objetivo do trabalho foi determinar parâmetros cinéticos de crescimento e caracterizar a biomassa de Spirulina sp. LEB 18 cultivada utilizando CO 2 como fonte de carbono. O cultivo foi realizado em fotobiorreator tubular horizontal equipado com air-lift sob condições controladas de luz e temperatura, até a fase estacionária de crescimento. Foi utilizado meio Zarrouk com fonte de N 2 reduzida em 50% e fonte de C substituída por 10% de CO 2 . A concentração celular máxima obtida foi 1,06 g.L -1 , produtividade 0,02 g.L.d -1 e biofixação diária máxima 160 mg.L.d -1 . A biomassa apresentou teor de proteinas, carboidratos, cinzas e lipidios, 47,3%, 13,4%, 12,3% e 11,7%, respectivamente, demonstrando que Spirulina sp. LEB 18 possui potencial para desenvolvimento de um processo que resulta na mitigação de CO 2 e uma variedade de biocompostos. Área temática: Processos Biotecnológicos 1Área temática: Processos Biotecnológicos

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Rheological behavior of Chlorella sp. e Scenedesmus sp. cultures in different biomass concentrations

Cited by 11 publications

References 15 publications

Rheological Characterization of Scenedesmus Sp. Pastes(Up To100 G/L) Produced In A 200-L Raceway and Harvested By Coagulation-Flocculation-Sedimentation

Rheological Characterization of Scenedesmus Sp. Pastes(Up To100 G/L) Produced In A 200-L Raceway and Harvested By Coagulation-Flocculation-Sedimentation

OUTDOOR CULTIVATION OF Scenedesmus obliquus BR003 IN STIRRED TANKS BY AIRLIFT

CULTIVO DE Spirulina sp. LEB 18 EM FOTOBIORREATOR TUBULAR HORIZONTAL PARA BIOFIXAÇÃO DE CO2

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