title: Optimization of biohydrogen yield produced by bacterial consortia using residual glycerin from biodiesel production.
abstract: The aims of this study were to simplify the fermentation medium and to optimize the conditions of dark fermentation of residual glycerin to produce biohydrogen. It was possible to remove all micronutrients of fermentation medium and improve biohydrogen production by applying residual glycerin as feedstock. After statistical analysis of the following parameters pH, glycerin concentration and volatile suspended solids, the values of 5.5; 0.5g.L(-1) and 8.7g.L(-1), respectively, were defined as optimum condition for this process. It generated 2.44molH2/molglycerin, an expressive result when compared to previous results reported in literature and considering that theoretical yield of H2 from glycerol in dark fermentation process is 3molH2/molglycerol. This study allowed the improvement of yield and productivity by 68% and 67%, respectively.
authors: National Institute of Technology, Ministry of Science and Technology, Laboratory of Biocatalysis, CEP 20081-312 Rio de Janeiro, RJ, Brazil. Electronic address: marianafaber@outlook.com.
authors: Mariana de Oliveira
authors: MO
authors: Faber
authors: National Institute of Technology, Ministry of Science and Technology, Laboratory of Biocatalysis, CEP 20081-312 Rio de Janeiro, RJ, Brazil; Federal University of Rio de Janeiro, Department of Biochemistry, CEP 21941-909 Rio de Janeiro, RJ, Brazil.
authors: Viridiana Santana
authors: VS
authors: Ferreira-Leitão
mesh_terms: D056804:Biofuels; D019149:Bioreactors / Q000382:microbiology*; D005285:Fermentation; D005990:Glycerol / Q000737:chemistry / Q000378:metabolism; D006859:Hydrogen / Q000032:analysis / Q000737:chemistry / Q000378:metabolism
chemical_list: D056804:Biofuels; D006859:Hydrogen; D005990:Glycerol
keywords: Biodiesel waste; Biohydrogen; Dark fermentation; Optimization; Residual glycerin