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Dynamics and control of a periodically forced microalgae culture ArchiMer
Martínez, Carlos; Mairet, Francis; Martinon, Pierre; Bernard, Olivier.
Microalgae cultivation with wastewater is a promising way of reducing the energetic needs for wastewater treatment and the costs of biofuel production. However, the very turbid medium is not favorable for the development of microalgae. Indeed, light, the key element for photosynthesis, rapidly vanishes along depth due to absorption and scattering. Therefore it is crucial to understand the effects of the depth on turbid cultures. In this work, we study theoretically the long-term behavior of a continuous culture of microalgae exposed to a periodic source of light. By allowing periodic variations of the depth and the hydraulic retention time, we show that the microalgae population is forced to a periodic regime. Finally, we address numerically the problem of...
Tipo: Text Palavras-chave: Dynamics and control; Industrial biotechnology; Wastewater; Biomass productivity; Microalgae.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00505/61623/65654.pdf
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Dynamics of the periodically forced light-limited Droop model ArchiMer
Martinez, Carlos; Mairet, Francis; Bernard, Olivier.
The periodically forced light-limited Droop model represents microalgae growth under co-limitation by light and a single substrate, accounting for periodic fluctuations of factors such as light and temperature. In this paper, we describe the global dynamics of this model, considering general monotone growth and uptake rate functions. Our main result gives necessary and sufficient conditions for the existence of a positive periodic solution (i.e. a periodic solution characterized by the presence of microalgae) which is globally attractive. In our approach, we reduce the model to a cooperative planar periodic system. Using results on periodic Kolmogorov equations and on monotone sub-homogeneous dynamical systems, we describe the global dynamics of the...
Tipo: Text Palavras-chave: Variable quota model; Positive periodic solution; Global stability; Microalgae; Cooperative system.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00599/71140/69455.pdf
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Economic Feasibility of Commercial Algae Oil Production in the United States AgEcon
Fischer, Bart L.; Richardson, James W.; Outlaw, Joe L.; Allison, Marc S..
A Monte Carlo simulation model was constructed to analyze the economic feasibility of growing algae as a renewable fuel source. Increasing growth rates, pond water depth, oil content, and facility size are important for ensuring the economic viability of a commercial algae facility.
Tipo: Conference Paper or Presentation Palavras-chave: Algae; Renewable; Fuel; Feedstock; Microalgae; Agribusiness; Agricultural and Food Policy; Crop Production/Industries; Production Economics; Resource /Energy Economics and Policy; Risk and Uncertainty.
Ano: 2011 URL: http://purl.umn.edu/98834
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Efeito do óxido de grafeno no crescimento da microalga Pseudokirchneriella subcapitata sob influência de substâncias húmicas. Repositório Alice
SOUZA, L. C. de; CASTANHA, R. F.; DOMINGOS, N.; CASTRO, V. L. S. S. de; JONSSON, C. M..
O grafeno é um nanomaterial promissor na remoção de pesticidas de águas, transporte de fármacos em medicamentos e transporte de agroquimicos em formulações. A qualidade do lodo agrícola usado como biofertilizante pode ser comprometida já que é esperado que materiais a base de grafeno estejam presentes nas estações de tratamento de efluentes em quantidades consideráveis A microalga Pseudokirchneriella subcapitata é uma clorofícea bioindicadora que tem sido amplamente utilizada em estudos de ecotoxicidade de poluentes e recomendada no registro de agentes químicos e biopesticidas. No presente trabalho avaliou-se o efeito do óxido de grafeno (OG) na taxa de crescimento de culturas desse organismo-teste, sob diferentes concentrações do nanomaterial e de...
Tipo: Separatas Palavras-chave: Grafeno; Bioindicator; Pseudokirchneriella subcapitata; Nanomaterial.; Composto químico; Toxidez; Microalga; Ecotoxicology; Graphene oxide; Humic substances; Microalgae; Indicator species.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1084273
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Effect of Dilution Rate on Azadinium spinosum and Azaspiracid (AZA) Production in Pilot Scale Photobioreactors for the Harvest of AZA1 and -2 ArchiMer
Jauffrais, Thierry; Sechet, Veronique; Truquet, Philippe; Amzil, Zouher; Herrenknecht, Christine; Hess, Philipp.
Azadinium spinosum, a small dinoflagellate has recently been discovered and identified as the primary producer of azaspiracid-1 (AZA) and -2. Since AZA poisoning has been reported following consumption of contaminated shellfish it is important to have these toxins available for toxicological studies, and a sustainable production of AZAs as calibrants in monitoring programs without having to rely on natural events. In order to address this concern, continuous pilot scale cultures were carried out to evaluate the feasibility of AZA production from A. spinosum. Algae were cultured using two 100 L chemostats in series (R1 and R2), with agitation and pH control. Four different dilution rates were tested (0.15, 0.2, 0.25 and 0.3 day−1) to evaluate chemostat...
Tipo: Text Palavras-chave: Solid phase adsorption; Chemostat; Photobioreactor; Microalgae; LC-MS/MS; Tangential flow filtration.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00152/26349/24437.pdf
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Effect of indigo dye effluent on the growth, biomass production and phenotypic plasticity of Scenedesmus quadricauda(Chlorococcales) Anais da ABC (AABC)
CHIA,MATHIAS A.; MUSA,RILWAN I..
The effect of indigo dye effluent on the freshwater microalgaScenedesmus quadricauda ABU12 was investigated under controlled laboratory conditions. The microalga was exposed to different concentrations of the effluent obtained by diluting the dye effluent from 100 to 175 times in bold basal medium (BBM). The growth rate of the microalga decreased as indigo dye effluent concentration increased (p <0.05). The EC50 was found to be 166 dilution factor of the effluent. Chlorophyll a, cell density and dry weight production as biomarkers were negatively affected by high indigo dye effluent concentration, their levels were higher at low effluent concentrations (p <0.05). Changes in coenobia size significantly correlated with the dye effluent concentration. A...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Freshwater; Microalgae; Morphological variation; Pollution; Textile waste.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100419
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Effect of stocking density on the growth and survival of Anomalocardia brasiliana (Gmelin, 1791) (Bivalvia: Veneridae) post-larvae Ciência Rural
Oliveira,Isabela Bacalhau de; Lavander,Henrique David; Lima,Priscilla Celes Maciel de; Oliveira,Carlos Yure Barbosa de; Dantas,Danielli Matias de Macedo; Gálvez,Alfredo Olivera.
ABSTRACT: Anomalocardia brasiliana post-larvae were cultured for 28 days to evaluate the effect of stocking density on their growth and survival rate. Three stocking densities were tested 40, 80 and 160 post-larvae cm-2, in experimental units (2-L) with static cultivation system and total water renewal at each 48 hours. The experimental design was completely randomized with three treatments and three repetitions each. Stocking density of 40 post-larvae cm-2 reached 1 mm length within 24 days, while only 18% of the post-larvae at density of 80 post-larvae cm-2 reached 1 mm length in the same time. The density of 40 post-larvae cm-2 had the highest specific growth rate, 4.98±0.08% day-1. The survival rates of post-larvae at lower densities were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aquaculture; Clams; Larviculture; Microalgae; West Indian pointed venus.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019001200652
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Effects of nitrogen and phosphorus on biochemical composition of microalgae polyculture harvested from phycoremediation of piggery wastewater digestate. Repositório Alice
MICHELON, W.; SILVA, M. L. B. da; MEZZARI, M. P.; PIROLLI, M.; PRANDINI, J. M.; SOARES, H. M..
Abstract: The effects of nitrogen (N) and/or phosphorus (P) starvation on the biochemical composition of native microalgae Chlorella spp. polyculture obtained from the phycoremediation of swine wastewaters were investigated. Microalgae-specific growth rate of 1.2 day(-1) was achieved (30.3 mg L(-1) day(-1)). PO4 (-2) and NH3 were completely removed from swine digestate effluent after 3 and 11 days, respectively. Microalgae harvested immediately after nutrient removal showed high protein (56-59 %) and carbohydrate (25-34 %) but low lipid (1.8-3 %) contents. Depletion of N or P alone stimulated carbohydrate production at the expenses of proteins. Significant lipid accumulation from 3 %&#8201;±&#8201;0.5 to 16.3 %&#8201;±&#8201;0.8 was reached...
Tipo: Artigo de periódico Palavras-chave: Swine wastewater; Phycoremediation; Suíno; Microalga; Águas Residuais; Carbohydrates; Lipids; Microalgae.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1111098
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Effects of nitrogen limitation on Dunaliella sp.–Alteromonas sp. interactions: from mutualistic to competitive relationships. ArchiMer
Le Chevanton, Myriam; Garnier, Matthieu; Lukomska, Ewa; Schreiber, Nathalie; Cadoret, Jean-paul; Saint-jean, Bruno; Bougaran, Gael.
Interactions between photosynthetic and non-photosynthetic microorganisms play an essential role in natural aquatic environments and the contribution of bacteria and microalgae to the nitrogen cycle can lead to both competitive and mutualistic relationships. Nitrogen is considered to be, with phosphorus and iron, one of the main limiting nutrients for primary production in the oceans and its availability experiences large temporal and geographical variations. For these reasons, it is important to understand how competitive and mutualistic interactions between photosynthetic and heterotrophic microorganisms are impacted by nitrogen limitation. In a previous study performed in batch cultures, the addition of a selected bacterial strain of Alteromonas sp....
Tipo: Text Palavras-chave: Interactions; Nitrogen limitation; Microalgae; Bacteria; Chemostat; Dissolved organic matter (DOM); Dunaliella.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00344/45529/45087.pdf
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Enhanced single-cell oil production by cold shock in cyanobacterial cultures Ciência Rural
Queiroz,Maria Isabel; Maroneze,Mariana Manzoni; Manetti,Adriana Gonçalves da Silva; Vieira,Juliana Guerra; Zepka,Leila Queiroz; Jacob-Lopes,Eduardo.
ABSTRACT: The aim of this research was to evaluate the enhanced single-cell oil production by cold shock in Aphanothece microscopica Nägeli using dairy processing wastewater as culture medium. The study focused on (i) temperature optimization for biomass production, (ii) cold shock application to induce lipids biosynthesis and (iii) determination of fatty acids profile under different conditions. Results indicated that temperature of 20°C was the best condition in terms of kinetics parameter, reaching biomass productivities of 160.25mg/L.h. Under these conditions, a lipid content of 12.65% was also observed, resulting in a lipid productivity of 20.27mg/L.h. Additionally, the 0°C cold shock was the most efficient in increasing intracellular lipid content,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aphanothece microscopica Nägeli; Dairy wastewater; Lipid; Microalgae; Temperature stress.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018001100750
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Enhancement of pigment extraction from B. braunii pretreated using CO2 rapid depressurization BJM
Uquiche,Edgar; Antilaf,Ivette; Millao,Sonia.
Abstract Extraction of compounds from microalgae requires cell disruption as a pretreatment to increase extraction yield. Botryococcus braunii is a microalga with a significant content of carotenoids and other antioxidant compounds, such as chlorophylls. Cell disruption of B. braunii using CO2 rapid depressurization was studied as a pretreatment for the extraction of carotenoid and chlorophyll pigments. We studied the effect of temperature (21–49 °C) and pressure (6–13 MPa) during static compression on pigment recovery with supercritical CO2 at 40 °C, 30 MPa and solvent flow of 4.7 L NPT/min. Within the experimental region, the extraction yield of carotenoids and chlorophylls increased by 2.4- and 2.2-fold respectively. Static compression conditions of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Botryococcus braunii; Cell disruption; Chlorophylls; Microalgae; Supercritical extraction.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822016000200497
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Estudo prospectivo de tecnologias baseadas na biomassa de microalgas e cianobactérias: abordagens bibliométrica e patentométrica. Infoteca-e
SCHULTZ, E. L.; QUINTINO, R. P.; ANJOS, S. S. N. dos.
A Embrapa Agroenergia possui seis Linhas de Atuação, as quais correspondem às seis plataformas industriais de biorrefinarias: (i) açúcares C5/C6, (ii) óleos vegetais, (iii) biogás, (iv) algas, v) lignina e vi) bio-óleo/syngas. O objetivo geral deste estudo é identificar, por técnicas de patentometria e bibliometria, as tecnologias baseadas no uso da biomassa de microalgas e cianobactérias, no contexto mundial. Os resultados obtidos geraram diversas informações de cunho estratégico, como os principais processos que utilizam microalgas e cianobactérias, bem como os produtos obtidos e os gêneros taxonômicos usados. Além disso, os principais campos tecnológicos encontrados em documentos de patente foram mostrados e analisados, incluindo o mapa de emergência e...
Tipo: Documentos (INFOTECA-E) Palavras-chave: Bibliometria; Cianobactéria; Patentometria; Estudo prospectivo; Microalga; Patente; Pesquisa; Biomassa; Microalgae; Cyanobacteria; Bibliometric analysis; Patents; Biomass.
Ano: 2021 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1134493
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Etude de nouvelles cibles moleculaires de cancer bronchopulmonaire non a petites cellules pharmacomodulées par des substances originales naturelles et synthetiques ArchiMer
Moreau, Dimitri.
Still rare disease at the beginning of the 20th century, the lung cancer is at the origin of more than 6 % of the deaths in France currently. It occupies there the first rank of the deaths by cancer whereas France is regarded as a country at the average risk among the Western countries. The discovery of new anti-cancer treatments increasingly more effective and specific, is thus today of primary importance. The validation of the capacity of a molecule to being able to inhibit the cancerous proliferation, passes by several stages of tests starting with the description of an activity at the cellular level. One of the strategies used for the discovery of new compounds antiproliferativs, passes by an investigation of the bioactiv potential of a great number...
Tipo: Text Palavras-chave: Microalgae; Natural products; Apoptosis; Antiproliferativ; Gene expression; Regulatory RNA; Molecular targets; Bronchopulmonary cancer; Microalgues; Molécules naturelles; Apoptose; Antiprolifératif; Expression génique; ARN régulateur; Cibles moléculaires; Cancer bronchopulmonaire.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/these-2196.pdf
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Etude des facteurs de transcription impliqués dans l’accumulation lipidique en condition de stress azoté chez la microalgue haptophyte Isochrysis affinis galbana ArchiMer
Thiriet-rupert, Stanislas.
In every organism, evolution and acclimation to environmental changes are orchestrated by numerous molecular players. Among them, transcription factors (TFs) play a crucial role by regulating gene expression. Therefore, identify TFs involved in the production of high value products is a significant step in a biotechnological context. The laboratory has at its disposal a mutant strain of the haptophyte microalga Tisochrysis lutea producing twice more storage lipids than the wild type strain when exposed to nitrogen deprivation. Given the key role of TFs in phenotype establishment, this PhD aim at identify the TFs involved in that of the mutant phenotype of T. lutea. A TFs identification and classification pipeline was elaborated and applied to T. lutea’s...
Tipo: Text Palavras-chave: Bioinformatique; Biologie moléculaire; Évolution; Facteur de transcription; Micro-algue; Réseau de gènes; RNA-seq; Bioinformatic; Evolution; Gene network; Molecular biology; Microalgae; RNAseq; Transcription factor.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00371/48233/48368.pdf
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Évaluation d’une suite de bio-essais pour la détection et l’étude de composés lipophiles de micro-organismes marins issus de mollusques bivalves et de leur environnement ArchiMer
Geiger, Marie.
The context of this study was the assessment of the safety of edible bivalve molluscs. Bivalve can indeed accumulate high concentrations of phycotoxins into their hepatopancreas, potentially leading to human intoxication outbreaks after consumption of such contaminated bivalves. In order to ensure the protection of shellfish consumers, regulated toxins are monitored using physico-chemical techniques. In parallel, emerging toxins, that can be putatively produced by microalgae or marine fungi, are monitored using the intraperitoneal mouse bioassay. However, this bioassay suffers ethical and methodological drawbacks. Thus, the objective of this work was to assess the ability of a bioassay suite to detect lipophilic toxins. This suite was composed of three...
Tipo: Text Palavras-chave: Cytotoxicité; Larves de diptères; Activité antibactérienne; Toxines lipophiles; Micro-algues; Dinoflagellés; Micromycètes; Penicillium; Acide okadaïque; Azaspiracide; Pinnatoxine G; Vulcanodinium rugosum; Prorocentrum lima; Azadinium spinosum; Beauveria brongniartii; Cytotoxicity; Diptera larvae; Antibacterial activity; Lipophilic toxins; Microalgae; Dinoflagellates; Marine fungi; Penicillium; Okadaic acid; Azaspiracid; Pinnatoxin G; Vulcanodinium rugosum; Azadinium spinosum; Prorocentrum lima; Beauveria brongniartii.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00183/29426/27787.pdf
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Evaluation of CO2 Biofixation and Biodiesel Production by Spirulina (Arthospira) Cultivated In Air-Lift Photobioreactor BABT
Morais,Etiele Greque de; Cassuriaga,Ana Paula Aguiar; Callejas,Nicolás; Martinez,Natalia; Vieitez,Ignacio; Jachmanián,Iván; Santos,Lucielen Oliveira; Morais,Michele Greque de; Costa,Jorge Alberto Vieira.
ABSTRACT Spirulina is a microalgal genre that has the capacity to produce various bioproducts with applications in several areas including the energy sector. The study aimed to assess the ability of CO2 biofixation, biodiesel and other biocompounds production by Spirulina sp LEB 18 cultured in air-lift photobioreactor. The microalgae presented a rich macronutrient composition: protein (47.3%), carbohydrates (13.4%) and a high lipid content (32.7%) in a media with nitrogen reduction, CO2 using air-lift photobiorector. Furthermore, 160 mg.L.d-1 of CO2 was biofixed, generating a maximum biomass yield of 0.02 g.L.d-1. The lipids evaluated for biodiesel production presented a theoretical yield of 19.8% for in situ transesterification and 47.9% for conventional...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biofuels; Carbon dioxide; Microalgae; Photobiorefinary; Biocompounds.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132018000100703
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Exploring the chemodiversity of tropical microalgae for the discovery of natural antifouling compounds ArchiMer
Réveillon, Damien; Tunin-ley, Alina; Grondin, Isabelle; Othmani, Ahlem; Zubia, Mayalen; Bunet, Robert; Turquet, Jean; Culioli, Gérald; Briand, Jean-françois.
Marine microalgae and cyanobacteria have largely been studied for their biotechnological potential and proved their ability to produce a wide array of bioactive molecules. We investigated the antifouling potential of unexplored benthic tropical microalgae using anti-adhesion and toxicity bioassays against two major micro- and ma crobiofoulers, namely bacteria and barnacles. Fifty strains belonging to six phyla [Cyanobacteria, Miozoa (Dinoflagellata), Bacillariophyta, Cryptophyta, Rhodophyta and Haptophyta] were isolated from southwestern Islands of the Indian Ocean. They were chosen in order to represent as much as possible the huge biodiversity of such a rich tropical ecosystem. The associated chemodiversity was highlighted by both NMR- and LC-MS-based...
Tipo: Text Palavras-chave: Microalgae; Antifouling; Bioassay; Chemodiversity; Bioprospecting; Metabolomics.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00454/56608/58333.pdf
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Growth and biochemical composition of Chlorella vulgaris in different growth media Anais da ABC (AABC)
CHIA,MATHIAS A.; LOMBARDI,ANA T.; MELãO,MARIA DA GRAÇA G..
The need for clean and low-cost algae production demands for investigations on algal physiological response under different growth conditions. In this research, we investigated the growth, biomass production and biochemical composition of Chlorella vulgaris using semi-continuous cultures employing three growth media (LC Oligo, Chu 10 and WC media). The highest cell density was obtained in LC Oligo, while the lowest in Chu medium. Chlorophyll a, carbohydrate and protein concentrations and yield were highest in Chu and LC Oligo media. Lipid class analysis showed that hydrocarbons (HC), sterol esthers (SE), free fatty acids (FFA), aliphatic alcohols (ALC), acetone mobile polar lipids (AMPL) and phospholipids (PL) concentrations and yields were highest in the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Carbohydrates; Lipid class; Microalgae; Proteins.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401427
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Growth of microalgae Scenedesmus sp in ethanol vinasse BABT
Ramirez,Nelzy Neyza Vargas; Farenzena,Marcelo; Trierweiler,Jorge Otávio.
This study evaluated the feasibility of using vinasse as a nutrient source for microalgae cultivation. The Scenedesmus sp was grown in a medium supplemented with vinasse and process variables were optimized using a factorial design and a Central Composite Design (CCD). The factorial design results showed that it was possible to cultivate microalgae at concentrations of up to 40% of vinasse in the culture medium. The CCD results showed that the light intensity and vinasse concentration influenced the amount of biomass produced.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Vinasse; Microalgae; Scenedesmussp; Photobioreactor air-lift.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132014000500630
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Harvesting Microalgal Biomass grown in Anaerobic Sewage Treatment Effluent by the Coagulation-Flocculation Method: Effect of pH BABT
Cassini,Servio Tulio; Francisco,Sara Aparecida; Antunes,Paulo Wagner Pereira; Oss,Rodrigo Nunes; Keller,Regina.
ABSTRACT Harvesting is a critical step in microalgal biomass production process for many reasons. Among the existing techniques available for harvesting and dewatering microalgal biomass, recovery from aqueous medium by coagulation-flocculation has been the most economically viable process, althoughit is highly dependent on pH. This study aims to assess alternative coagulants compared to the standard coagulant aluminum sulfate for microalgal biomass recovery from anaerobic effluent of domestic sewage treatment. The effluent quality was also analyzed after biomass recovery. Coagulants represented by modified tannin, cationic starch and aluminum sulfate recovered more than 90% of algae biomass, at concentrations greater than 80 mg/L, in the pH range 7-10....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Microalgae; Anaerobic effluent; Coagulation-flocculation; PH.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132017000100700
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