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Alternate green approach of spent media utilization for hydrogen and for lipid production.

Pachapur, Vinayak Laxman; Brar, Satinder Kaur; Le Bihan, Yann; Buelna, Gerardo (2017). Alternate green approach of spent media utilization for hydrogen and for lipid production. International Journal of Hydrogen Energy , vol. 42 , nº 9. p. 5832-5839. DOI: 10.1016/j.ijhydene.2016.11.135.

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In a view to uplift the biodiesel industry as a major energy carrier, new approach of minimizing the waste and utilizing generated waste needs to be explored. The spent media generated from the co-culture system is cost effective and can serve as renewable supplement for mixed-culture based hydrogen (H₂) production and lipid production. Direct conversion of spent media along with crude glycerol (CG) at 20 g/L using heat-shock pretreated wastewater sludge resulted in 38.12 ± 0.84 mmol/L of H₂. In another approach, the spent media was used as co-supplement along with fresh media at 3:2 for algal growth, resulting in 0.098 ± 0.007 g/L of lipid. The spent media contained dead biomass, residual media nutrients, biomolecules and unutilized glycerol together acting as supplementary source during H₂ and lipid production. According to the closed system results, the H₂ produced (1.47 × 10⁹ L of H₂) can be converted into energy (1.87 × 10⁴ GJ) for electricity (1.77 × 10⁴ GJ) and heat (4.32 × 10³ GJ). The produced H₂ can be used as in-house energy source and the lipids can be used as third generation feedstock. The study explores the utilization of CG and spent media valorization towards an efficient closed system approach for a competitive biodiesel industry.

Type de document: Article
Mots-clés libres: biodiesel; crude glycerol; hydrogen; lipid; mixed-culture; photo-fermentation
Centre: Centre Eau Terre Environnement
Date de dépôt: 06 sept. 2017 20:56
Dernière modification: 06 sept. 2017 20:56
URI: http://espace.inrs.ca/id/eprint/5175

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