Spirulina sp. LEB-18 culture using effluent from the anaerobic digestion

Abstract

-The carbon source is the most expensive nutrient for Spirulina production; effluents from anaerobic digestion contain this nutrient in the form of HCO 3 -. The aim of this study was to assess the growth kinetics, composition and fatty acid profile of Spirulina sp. LEB-18 grown in standard Zarrouk medium (NaHCO 3 16.8 g L -1) and in Zarrouk medium replaced with 20% (v/v) effluent with reduced concentrations of NaHCO 3 (5.3 and 2.8 g L -1 ). The use of effluent and lower concentrations of HCO 3 -was found to be an alternative to reduce the costs of Spirulina production, because there were no significant differences in growth parameters (μ max 0.324 -0.354 d -1 ; P max 0.280 -0.297 g L -1 d -1 ), in the different culture medium used. Lipids ranged between 4.9 and 5.0%; the media with effluent had higher levels of linoleic acid compared to the standard medium.

Chemical absorption and CO2 biofixation via the cultivation of Spirulina in semicontinuous mode with nutrient recycle

“…The final protein content (44.4 ± 6.9% w w À1 ) in the biomass cultivated using MEA (Table 2) was lower than that normally found in Spirulina sp. LEB 18 biomass (60-70% w w À1 ), as reported by Borges et al (2013). Nonetheless, the control assay (60.8 ± 4.0% w w À1 ) remained within this protein concentration range.…”

“…The lipid content of the biomass produced with MEA (8.3 ± 1.4% w w À1 ) and without MEA (10.0 ± 1.2% w w À1 ) was higher than that found by Borges et al (2013) (5.0% w w À1 ) and Morais et al (2009) (3.3% w w À1 ) using the same strain as the present study. These authors cultivated Spirulina in open reactors that, according to Chisti (2007), may lead to lower biomass productivity, but this cannot explain the low lipid levels in relation to the values found in the present experiments.…”

APLICAÇÃO DE MEMBRANAS DE FIBRA OCA NA BIOFIXAÇÃO DE CO2 POR Spirulina

“…Conforme relatado por Borges et al (2013), a biomassa microalgal pode apresentar em torno de 50 % m.m -1 deste elemento em sua composição. Quanto à máxima taxa de biofixação de CO 2 e a eficiência de utilização de CO 2 pela microalga Spirulina sp.…”

INFLUÊNCIA DE DIFERENTES ABSORVENTES DE CO2 NA BIOFIXAÇÃO DE CARBONO E NA COMPOSIÇÃO DA CIANOBACTÉRIA Spirulina

“…Estes valores encontrados situam-se entre os encontrados por Colla et al (2007) A concentração de carboidratos utilizando MEA foi menor que com NaOH em todos os cultivos com adição de absorvente. A maior concentração de carboidratos encontrado no corrente trabalho foi em média em 15,1 %, enquanto que Borges et al (2013), também com Spirulina sp. LEB 18, encontraram em média 19,1 %.…”

“…Contudo, com esta mesma cepa de Spirulina foi encontrado, por Borges et al (2013), concentração de lipídios (5,0 % m.m -1 ) em torno de 60 % menores que do presente trabalho.…”