title: Mitigation of the inhibitory effect of soap by magnesium salt treatment of crude glycerol--a novel approach for enhanced biohydrogen production from the biodiesel industry waste.
abstract: Owing to its inhibitory effect on microbial growth, soap present in crude glycerol (CG) is a concern in biological valorization of the biodiesel manufacturing waste. By salting out strategy, up to 42% of the soap has been removed and the approach has beneficial effect on H2 production; however, removal of more than 7% of the soap was found to be inhibitory. Actually, soap is utilized as a co-substrate and due to removal; the carbon-nitrogen ratio of the medium might have decreased to reduce the production. Alternatively, without changing the carbon-nitrogen ratio of CG, MgSO4 treatment can convert the soap to its inactive form (scum). The approach was found to increase the H2 production rate (33.82%), cumulative H2 production (34.70%) as well as glycerol utilization (nearly 2.5-folds). Additionally, the treatment can increase the Mg (a nutrient) content of the medium from 0.57 ppm to 201.92 ppm.
authors.affiliation: Institut National de la Recherche Scientifique, Centre-Eau Terre Environnement, 490, Rue de la Couronne, Québec, QC G1K 9A9, Canada.
authors.forename: Saurabh Jyoti
authors.initials: SJ
authors.lastname: Sarma
authors.forename: Satinder Kaur
authors.initials: SK
authors.lastname: Brar
authors.forename: Yann
authors.initials: Y
authors.lastname: Le Bihan
authors.forename: Gerardo
authors.initials: G
authors.lastname: Buelna
authors.forename: Carlos Ricardo
authors.initials: CR
authors.lastname: Soccol
mesh_terms: D056804:Biofuels; D001709:Biotechnology / Q000379:methods*; D021902:Enterobacter aerogenes / Q000187:drug effects / Q000378:metabolism; D005990:Glycerol / Q000494:pharmacology*; D006859:Hydrogen / Q000378:metabolism*; D007220:Industrial Waste / Q000032:analysis*; D008278:Magnesium Sulfate / Q000494:pharmacology*; D012915:Soaps / Q000494:pharmacology*; D012965:Sodium Chloride / Q000494:pharmacology
chemical_list: D056804:Biofuels; D007220:Industrial Waste; D012915:Soaps; D012965:Sodium Chloride; D008278:Magnesium Sulfate; D006859:Hydrogen; D005990:Glycerol
keywords: Biodiesel; Biohydrogen; Crude glycerol; Impurity; Soap